Mercurial > repos > blastem
annotate zlib/trees.c @ 1965:3a46ff899fa6
More correct implementation of byte printing in builtin debugger. Fix GDB debugger to use helper in backend.c for reading bytes
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 03 May 2020 23:28:42 -0700 |
parents | 00d788dac91a |
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1 /* trees.c -- output deflated data using Huffman coding |
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2 * Copyright (C) 1995-2017 Jean-loup Gailly |
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3 * detect_data_type() function provided freely by Cosmin Truta, 2006 |
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4 * For conditions of distribution and use, see copyright notice in zlib.h |
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5 */ |
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6 |
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7 /* |
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8 * ALGORITHM |
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9 * |
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10 * The "deflation" process uses several Huffman trees. The more |
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11 * common source values are represented by shorter bit sequences. |
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12 * |
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13 * Each code tree is stored in a compressed form which is itself |
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14 * a Huffman encoding of the lengths of all the code strings (in |
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15 * ascending order by source values). The actual code strings are |
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16 * reconstructed from the lengths in the inflate process, as described |
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17 * in the deflate specification. |
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18 * |
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19 * REFERENCES |
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20 * |
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21 * Deutsch, L.P.,"'Deflate' Compressed Data Format Specification". |
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22 * Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc |
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23 * |
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24 * Storer, James A. |
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25 * Data Compression: Methods and Theory, pp. 49-50. |
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26 * Computer Science Press, 1988. ISBN 0-7167-8156-5. |
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27 * |
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28 * Sedgewick, R. |
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29 * Algorithms, p290. |
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30 * Addison-Wesley, 1983. ISBN 0-201-06672-6. |
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31 */ |
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32 |
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33 /* @(#) $Id$ */ |
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34 |
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35 /* #define GEN_TREES_H */ |
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36 |
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37 #include "deflate.h" |
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38 |
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39 #ifdef ZLIB_DEBUG |
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40 # include <ctype.h> |
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41 #endif |
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42 |
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43 /* =========================================================================== |
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44 * Constants |
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45 */ |
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46 |
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47 #define MAX_BL_BITS 7 |
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48 /* Bit length codes must not exceed MAX_BL_BITS bits */ |
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49 |
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50 #define END_BLOCK 256 |
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51 /* end of block literal code */ |
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52 |
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53 #define REP_3_6 16 |
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54 /* repeat previous bit length 3-6 times (2 bits of repeat count) */ |
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55 |
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56 #define REPZ_3_10 17 |
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57 /* repeat a zero length 3-10 times (3 bits of repeat count) */ |
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58 |
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59 #define REPZ_11_138 18 |
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60 /* repeat a zero length 11-138 times (7 bits of repeat count) */ |
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61 |
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62 local const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */ |
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63 = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0}; |
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64 |
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65 local const int extra_dbits[D_CODES] /* extra bits for each distance code */ |
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66 = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; |
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67 |
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68 local const int extra_blbits[BL_CODES]/* extra bits for each bit length code */ |
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69 = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7}; |
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70 |
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71 local const uch bl_order[BL_CODES] |
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72 = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15}; |
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73 /* The lengths of the bit length codes are sent in order of decreasing |
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74 * probability, to avoid transmitting the lengths for unused bit length codes. |
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75 */ |
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76 |
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77 /* =========================================================================== |
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78 * Local data. These are initialized only once. |
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79 */ |
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80 |
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81 #define DIST_CODE_LEN 512 /* see definition of array dist_code below */ |
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82 |
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83 #if defined(GEN_TREES_H) || !defined(STDC) |
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84 /* non ANSI compilers may not accept trees.h */ |
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85 |
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86 local ct_data static_ltree[L_CODES+2]; |
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87 /* The static literal tree. Since the bit lengths are imposed, there is no |
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88 * need for the L_CODES extra codes used during heap construction. However |
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89 * The codes 286 and 287 are needed to build a canonical tree (see _tr_init |
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90 * below). |
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91 */ |
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92 |
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93 local ct_data static_dtree[D_CODES]; |
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94 /* The static distance tree. (Actually a trivial tree since all codes use |
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95 * 5 bits.) |
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96 */ |
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97 |
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98 uch _dist_code[DIST_CODE_LEN]; |
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99 /* Distance codes. The first 256 values correspond to the distances |
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100 * 3 .. 258, the last 256 values correspond to the top 8 bits of |
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101 * the 15 bit distances. |
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102 */ |
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103 |
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104 uch _length_code[MAX_MATCH-MIN_MATCH+1]; |
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105 /* length code for each normalized match length (0 == MIN_MATCH) */ |
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106 |
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107 local int base_length[LENGTH_CODES]; |
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108 /* First normalized length for each code (0 = MIN_MATCH) */ |
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109 |
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110 local int base_dist[D_CODES]; |
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111 /* First normalized distance for each code (0 = distance of 1) */ |
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112 |
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113 #else |
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114 # include "trees.h" |
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115 #endif /* GEN_TREES_H */ |
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116 |
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117 struct static_tree_desc_s { |
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118 const ct_data *static_tree; /* static tree or NULL */ |
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119 const intf *extra_bits; /* extra bits for each code or NULL */ |
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120 int extra_base; /* base index for extra_bits */ |
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121 int elems; /* max number of elements in the tree */ |
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122 int max_length; /* max bit length for the codes */ |
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123 }; |
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124 |
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125 local const static_tree_desc static_l_desc = |
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126 {static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS}; |
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127 |
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128 local const static_tree_desc static_d_desc = |
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129 {static_dtree, extra_dbits, 0, D_CODES, MAX_BITS}; |
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130 |
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131 local const static_tree_desc static_bl_desc = |
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132 {(const ct_data *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS}; |
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133 |
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134 /* =========================================================================== |
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135 * Local (static) routines in this file. |
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136 */ |
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137 |
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138 local void tr_static_init OF((void)); |
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139 local void init_block OF((deflate_state *s)); |
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140 local void pqdownheap OF((deflate_state *s, ct_data *tree, int k)); |
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141 local void gen_bitlen OF((deflate_state *s, tree_desc *desc)); |
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142 local void gen_codes OF((ct_data *tree, int max_code, ushf *bl_count)); |
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143 local void build_tree OF((deflate_state *s, tree_desc *desc)); |
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144 local void scan_tree OF((deflate_state *s, ct_data *tree, int max_code)); |
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145 local void send_tree OF((deflate_state *s, ct_data *tree, int max_code)); |
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146 local int build_bl_tree OF((deflate_state *s)); |
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147 local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes, |
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148 int blcodes)); |
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149 local void compress_block OF((deflate_state *s, const ct_data *ltree, |
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150 const ct_data *dtree)); |
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151 local int detect_data_type OF((deflate_state *s)); |
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152 local unsigned bi_reverse OF((unsigned value, int length)); |
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153 local void bi_windup OF((deflate_state *s)); |
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154 local void bi_flush OF((deflate_state *s)); |
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155 |
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156 #ifdef GEN_TREES_H |
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157 local void gen_trees_header OF((void)); |
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158 #endif |
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159 |
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160 #ifndef ZLIB_DEBUG |
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161 # define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len) |
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162 /* Send a code of the given tree. c and tree must not have side effects */ |
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163 |
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164 #else /* !ZLIB_DEBUG */ |
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165 # define send_code(s, c, tree) \ |
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166 { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \ |
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167 send_bits(s, tree[c].Code, tree[c].Len); } |
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168 #endif |
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169 |
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170 /* =========================================================================== |
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171 * Output a short LSB first on the stream. |
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172 * IN assertion: there is enough room in pendingBuf. |
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173 */ |
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174 #define put_short(s, w) { \ |
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175 put_byte(s, (uch)((w) & 0xff)); \ |
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176 put_byte(s, (uch)((ush)(w) >> 8)); \ |
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177 } |
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178 |
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179 /* =========================================================================== |
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180 * Send a value on a given number of bits. |
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181 * IN assertion: length <= 16 and value fits in length bits. |
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182 */ |
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183 #ifdef ZLIB_DEBUG |
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184 local void send_bits OF((deflate_state *s, int value, int length)); |
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185 |
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186 local void send_bits(s, value, length) |
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187 deflate_state *s; |
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188 int value; /* value to send */ |
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189 int length; /* number of bits */ |
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190 { |
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191 Tracevv((stderr," l %2d v %4x ", length, value)); |
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192 Assert(length > 0 && length <= 15, "invalid length"); |
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193 s->bits_sent += (ulg)length; |
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194 |
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195 /* If not enough room in bi_buf, use (valid) bits from bi_buf and |
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196 * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid)) |
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197 * unused bits in value. |
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198 */ |
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199 if (s->bi_valid > (int)Buf_size - length) { |
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200 s->bi_buf |= (ush)value << s->bi_valid; |
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201 put_short(s, s->bi_buf); |
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202 s->bi_buf = (ush)value >> (Buf_size - s->bi_valid); |
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203 s->bi_valid += length - Buf_size; |
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204 } else { |
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205 s->bi_buf |= (ush)value << s->bi_valid; |
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206 s->bi_valid += length; |
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207 } |
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208 } |
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209 #else /* !ZLIB_DEBUG */ |
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210 |
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211 #define send_bits(s, value, length) \ |
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212 { int len = length;\ |
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213 if (s->bi_valid > (int)Buf_size - len) {\ |
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214 int val = (int)value;\ |
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215 s->bi_buf |= (ush)val << s->bi_valid;\ |
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216 put_short(s, s->bi_buf);\ |
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217 s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\ |
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218 s->bi_valid += len - Buf_size;\ |
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219 } else {\ |
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220 s->bi_buf |= (ush)(value) << s->bi_valid;\ |
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221 s->bi_valid += len;\ |
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222 }\ |
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223 } |
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224 #endif /* ZLIB_DEBUG */ |
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225 |
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226 |
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227 /* the arguments must not have side effects */ |
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228 |
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229 /* =========================================================================== |
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230 * Initialize the various 'constant' tables. |
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231 */ |
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232 local void tr_static_init() |
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233 { |
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234 #if defined(GEN_TREES_H) || !defined(STDC) |
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235 static int static_init_done = 0; |
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236 int n; /* iterates over tree elements */ |
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237 int bits; /* bit counter */ |
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238 int length; /* length value */ |
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239 int code; /* code value */ |
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240 int dist; /* distance index */ |
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241 ush bl_count[MAX_BITS+1]; |
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242 /* number of codes at each bit length for an optimal tree */ |
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243 |
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244 if (static_init_done) return; |
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245 |
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246 /* For some embedded targets, global variables are not initialized: */ |
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247 #ifdef NO_INIT_GLOBAL_POINTERS |
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248 static_l_desc.static_tree = static_ltree; |
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249 static_l_desc.extra_bits = extra_lbits; |
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250 static_d_desc.static_tree = static_dtree; |
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251 static_d_desc.extra_bits = extra_dbits; |
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252 static_bl_desc.extra_bits = extra_blbits; |
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253 #endif |
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254 |
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255 /* Initialize the mapping length (0..255) -> length code (0..28) */ |
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256 length = 0; |
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257 for (code = 0; code < LENGTH_CODES-1; code++) { |
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258 base_length[code] = length; |
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259 for (n = 0; n < (1<<extra_lbits[code]); n++) { |
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260 _length_code[length++] = (uch)code; |
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261 } |
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262 } |
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263 Assert (length == 256, "tr_static_init: length != 256"); |
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264 /* Note that the length 255 (match length 258) can be represented |
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265 * in two different ways: code 284 + 5 bits or code 285, so we |
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266 * overwrite length_code[255] to use the best encoding: |
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267 */ |
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268 _length_code[length-1] = (uch)code; |
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269 |
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270 /* Initialize the mapping dist (0..32K) -> dist code (0..29) */ |
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271 dist = 0; |
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272 for (code = 0 ; code < 16; code++) { |
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273 base_dist[code] = dist; |
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274 for (n = 0; n < (1<<extra_dbits[code]); n++) { |
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275 _dist_code[dist++] = (uch)code; |
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276 } |
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277 } |
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278 Assert (dist == 256, "tr_static_init: dist != 256"); |
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279 dist >>= 7; /* from now on, all distances are divided by 128 */ |
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280 for ( ; code < D_CODES; code++) { |
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281 base_dist[code] = dist << 7; |
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282 for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) { |
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283 _dist_code[256 + dist++] = (uch)code; |
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284 } |
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285 } |
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286 Assert (dist == 256, "tr_static_init: 256+dist != 512"); |
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287 |
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288 /* Construct the codes of the static literal tree */ |
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289 for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0; |
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290 n = 0; |
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291 while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++; |
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292 while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++; |
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293 while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++; |
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294 while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++; |
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295 /* Codes 286 and 287 do not exist, but we must include them in the |
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296 * tree construction to get a canonical Huffman tree (longest code |
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297 * all ones) |
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298 */ |
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299 gen_codes((ct_data *)static_ltree, L_CODES+1, bl_count); |
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300 |
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301 /* The static distance tree is trivial: */ |
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302 for (n = 0; n < D_CODES; n++) { |
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303 static_dtree[n].Len = 5; |
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304 static_dtree[n].Code = bi_reverse((unsigned)n, 5); |
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305 } |
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306 static_init_done = 1; |
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307 |
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308 # ifdef GEN_TREES_H |
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309 gen_trees_header(); |
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310 # endif |
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311 #endif /* defined(GEN_TREES_H) || !defined(STDC) */ |
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312 } |
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313 |
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314 /* =========================================================================== |
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315 * Genererate the file trees.h describing the static trees. |
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316 */ |
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317 #ifdef GEN_TREES_H |
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318 # ifndef ZLIB_DEBUG |
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319 # include <stdio.h> |
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320 # endif |
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321 |
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322 # define SEPARATOR(i, last, width) \ |
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323 ((i) == (last)? "\n};\n\n" : \ |
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324 ((i) % (width) == (width)-1 ? ",\n" : ", ")) |
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325 |
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326 void gen_trees_header() |
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327 { |
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328 FILE *header = fopen("trees.h", "w"); |
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329 int i; |
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330 |
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331 Assert (header != NULL, "Can't open trees.h"); |
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332 fprintf(header, |
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333 "/* header created automatically with -DGEN_TREES_H */\n\n"); |
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334 |
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335 fprintf(header, "local const ct_data static_ltree[L_CODES+2] = {\n"); |
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336 for (i = 0; i < L_CODES+2; i++) { |
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337 fprintf(header, "{{%3u},{%3u}}%s", static_ltree[i].Code, |
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338 static_ltree[i].Len, SEPARATOR(i, L_CODES+1, 5)); |
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339 } |
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340 |
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341 fprintf(header, "local const ct_data static_dtree[D_CODES] = {\n"); |
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342 for (i = 0; i < D_CODES; i++) { |
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343 fprintf(header, "{{%2u},{%2u}}%s", static_dtree[i].Code, |
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344 static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5)); |
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345 } |
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346 |
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347 fprintf(header, "const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {\n"); |
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348 for (i = 0; i < DIST_CODE_LEN; i++) { |
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349 fprintf(header, "%2u%s", _dist_code[i], |
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350 SEPARATOR(i, DIST_CODE_LEN-1, 20)); |
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351 } |
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352 |
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353 fprintf(header, |
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354 "const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {\n"); |
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355 for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) { |
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356 fprintf(header, "%2u%s", _length_code[i], |
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357 SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20)); |
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358 } |
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359 |
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360 fprintf(header, "local const int base_length[LENGTH_CODES] = {\n"); |
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361 for (i = 0; i < LENGTH_CODES; i++) { |
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362 fprintf(header, "%1u%s", base_length[i], |
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363 SEPARATOR(i, LENGTH_CODES-1, 20)); |
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364 } |
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365 |
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366 fprintf(header, "local const int base_dist[D_CODES] = {\n"); |
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367 for (i = 0; i < D_CODES; i++) { |
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368 fprintf(header, "%5u%s", base_dist[i], |
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369 SEPARATOR(i, D_CODES-1, 10)); |
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370 } |
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371 |
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372 fclose(header); |
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373 } |
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374 #endif /* GEN_TREES_H */ |
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375 |
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376 /* =========================================================================== |
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377 * Initialize the tree data structures for a new zlib stream. |
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378 */ |
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379 void ZLIB_INTERNAL _tr_init(s) |
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380 deflate_state *s; |
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381 { |
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382 tr_static_init(); |
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383 |
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384 s->l_desc.dyn_tree = s->dyn_ltree; |
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385 s->l_desc.stat_desc = &static_l_desc; |
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386 |
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387 s->d_desc.dyn_tree = s->dyn_dtree; |
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388 s->d_desc.stat_desc = &static_d_desc; |
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389 |
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390 s->bl_desc.dyn_tree = s->bl_tree; |
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391 s->bl_desc.stat_desc = &static_bl_desc; |
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392 |
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393 s->bi_buf = 0; |
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394 s->bi_valid = 0; |
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395 #ifdef ZLIB_DEBUG |
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396 s->compressed_len = 0L; |
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397 s->bits_sent = 0L; |
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398 #endif |
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399 |
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400 /* Initialize the first block of the first file: */ |
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401 init_block(s); |
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402 } |
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403 |
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404 /* =========================================================================== |
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405 * Initialize a new block. |
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406 */ |
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407 local void init_block(s) |
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408 deflate_state *s; |
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409 { |
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410 int n; /* iterates over tree elements */ |
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411 |
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412 /* Initialize the trees. */ |
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413 for (n = 0; n < L_CODES; n++) s->dyn_ltree[n].Freq = 0; |
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414 for (n = 0; n < D_CODES; n++) s->dyn_dtree[n].Freq = 0; |
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415 for (n = 0; n < BL_CODES; n++) s->bl_tree[n].Freq = 0; |
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416 |
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417 s->dyn_ltree[END_BLOCK].Freq = 1; |
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418 s->opt_len = s->static_len = 0L; |
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419 s->last_lit = s->matches = 0; |
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420 } |
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421 |
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422 #define SMALLEST 1 |
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423 /* Index within the heap array of least frequent node in the Huffman tree */ |
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424 |
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425 |
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426 /* =========================================================================== |
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427 * Remove the smallest element from the heap and recreate the heap with |
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428 * one less element. Updates heap and heap_len. |
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429 */ |
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430 #define pqremove(s, tree, top) \ |
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431 {\ |
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432 top = s->heap[SMALLEST]; \ |
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433 s->heap[SMALLEST] = s->heap[s->heap_len--]; \ |
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434 pqdownheap(s, tree, SMALLEST); \ |
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435 } |
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436 |
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437 /* =========================================================================== |
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438 * Compares to subtrees, using the tree depth as tie breaker when |
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439 * the subtrees have equal frequency. This minimizes the worst case length. |
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440 */ |
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441 #define smaller(tree, n, m, depth) \ |
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442 (tree[n].Freq < tree[m].Freq || \ |
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443 (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m])) |
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444 |
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445 /* =========================================================================== |
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446 * Restore the heap property by moving down the tree starting at node k, |
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447 * exchanging a node with the smallest of its two sons if necessary, stopping |
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448 * when the heap property is re-established (each father smaller than its |
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449 * two sons). |
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450 */ |
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451 local void pqdownheap(s, tree, k) |
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452 deflate_state *s; |
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453 ct_data *tree; /* the tree to restore */ |
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454 int k; /* node to move down */ |
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|
455 { |
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456 int v = s->heap[k]; |
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457 int j = k << 1; /* left son of k */ |
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458 while (j <= s->heap_len) { |
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459 /* Set j to the smallest of the two sons: */ |
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460 if (j < s->heap_len && |
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461 smaller(tree, s->heap[j+1], s->heap[j], s->depth)) { |
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462 j++; |
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463 } |
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464 /* Exit if v is smaller than both sons */ |
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465 if (smaller(tree, v, s->heap[j], s->depth)) break; |
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|
466 |
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467 /* Exchange v with the smallest son */ |
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468 s->heap[k] = s->heap[j]; k = j; |
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|
469 |
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470 /* And continue down the tree, setting j to the left son of k */ |
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471 j <<= 1; |
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472 } |
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473 s->heap[k] = v; |
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474 } |
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|
475 |
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|
476 /* =========================================================================== |
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|
477 * Compute the optimal bit lengths for a tree and update the total bit length |
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478 * for the current block. |
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479 * IN assertion: the fields freq and dad are set, heap[heap_max] and |
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480 * above are the tree nodes sorted by increasing frequency. |
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|
481 * OUT assertions: the field len is set to the optimal bit length, the |
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482 * array bl_count contains the frequencies for each bit length. |
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483 * The length opt_len is updated; static_len is also updated if stree is |
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484 * not null. |
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485 */ |
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486 local void gen_bitlen(s, desc) |
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487 deflate_state *s; |
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488 tree_desc *desc; /* the tree descriptor */ |
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489 { |
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490 ct_data *tree = desc->dyn_tree; |
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491 int max_code = desc->max_code; |
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492 const ct_data *stree = desc->stat_desc->static_tree; |
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493 const intf *extra = desc->stat_desc->extra_bits; |
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494 int base = desc->stat_desc->extra_base; |
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495 int max_length = desc->stat_desc->max_length; |
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496 int h; /* heap index */ |
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497 int n, m; /* iterate over the tree elements */ |
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498 int bits; /* bit length */ |
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499 int xbits; /* extra bits */ |
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500 ush f; /* frequency */ |
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|
501 int overflow = 0; /* number of elements with bit length too large */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
502 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
503 for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
504 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
505 /* In a first pass, compute the optimal bit lengths (which may |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
506 * overflow in the case of the bit length tree). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
507 */ |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
508 tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
509 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
510 for (h = s->heap_max+1; h < HEAP_SIZE; h++) { |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
511 n = s->heap[h]; |
00d788dac91a
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parents:
diff
changeset
|
512 bits = tree[tree[n].Dad].Len + 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
513 if (bits > max_length) bits = max_length, overflow++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
514 tree[n].Len = (ush)bits; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
515 /* We overwrite tree[n].Dad which is no longer needed */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
516 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
517 if (n > max_code) continue; /* not a leaf node */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
518 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
519 s->bl_count[bits]++; |
00d788dac91a
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parents:
diff
changeset
|
520 xbits = 0; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
521 if (n >= base) xbits = extra[n-base]; |
00d788dac91a
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parents:
diff
changeset
|
522 f = tree[n].Freq; |
00d788dac91a
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parents:
diff
changeset
|
523 s->opt_len += (ulg)f * (unsigned)(bits + xbits); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
524 if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
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|
525 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
526 if (overflow == 0) return; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
527 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
528 Tracev((stderr,"\nbit length overflow\n")); |
00d788dac91a
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parents:
diff
changeset
|
529 /* This happens for example on obj2 and pic of the Calgary corpus */ |
00d788dac91a
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parents:
diff
changeset
|
530 |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
531 /* Find the first bit length which could increase: */ |
00d788dac91a
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parents:
diff
changeset
|
532 do { |
00d788dac91a
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parents:
diff
changeset
|
533 bits = max_length-1; |
00d788dac91a
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parents:
diff
changeset
|
534 while (s->bl_count[bits] == 0) bits--; |
00d788dac91a
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parents:
diff
changeset
|
535 s->bl_count[bits]--; /* move one leaf down the tree */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
536 s->bl_count[bits+1] += 2; /* move one overflow item as its brother */ |
00d788dac91a
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parents:
diff
changeset
|
537 s->bl_count[max_length]--; |
00d788dac91a
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parents:
diff
changeset
|
538 /* The brother of the overflow item also moves one step up, |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
539 * but this does not affect bl_count[max_length] |
00d788dac91a
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parents:
diff
changeset
|
540 */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
541 overflow -= 2; |
00d788dac91a
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parents:
diff
changeset
|
542 } while (overflow > 0); |
00d788dac91a
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parents:
diff
changeset
|
543 |
00d788dac91a
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parents:
diff
changeset
|
544 /* Now recompute all bit lengths, scanning in increasing frequency. |
00d788dac91a
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parents:
diff
changeset
|
545 * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all |
00d788dac91a
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parents:
diff
changeset
|
546 * lengths instead of fixing only the wrong ones. This idea is taken |
00d788dac91a
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parents:
diff
changeset
|
547 * from 'ar' written by Haruhiko Okumura.) |
00d788dac91a
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parents:
diff
changeset
|
548 */ |
00d788dac91a
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parents:
diff
changeset
|
549 for (bits = max_length; bits != 0; bits--) { |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
550 n = s->bl_count[bits]; |
00d788dac91a
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parents:
diff
changeset
|
551 while (n != 0) { |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
552 m = s->heap[--h]; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
553 if (m > max_code) continue; |
00d788dac91a
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parents:
diff
changeset
|
554 if ((unsigned) tree[m].Len != (unsigned) bits) { |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
555 Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits)); |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
556 s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
557 tree[m].Len = (ush)bits; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
558 } |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
559 n--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
560 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
561 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
562 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
563 |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
564 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
565 * Generate the codes for a given tree and bit counts (which need not be |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
566 * optimal). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
567 * IN assertion: the array bl_count contains the bit length statistics for |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
568 * the given tree and the field len is set for all tree elements. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
569 * OUT assertion: the field code is set for all tree elements of non |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
570 * zero code length. |
00d788dac91a
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parents:
diff
changeset
|
571 */ |
00d788dac91a
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parents:
diff
changeset
|
572 local void gen_codes (tree, max_code, bl_count) |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
573 ct_data *tree; /* the tree to decorate */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
574 int max_code; /* largest code with non zero frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
575 ushf *bl_count; /* number of codes at each bit length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
576 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
577 ush next_code[MAX_BITS+1]; /* next code value for each bit length */ |
00d788dac91a
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parents:
diff
changeset
|
578 unsigned code = 0; /* running code value */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
579 int bits; /* bit index */ |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
580 int n; /* code index */ |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
581 |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
582 /* The distribution counts are first used to generate the code values |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
583 * without bit reversal. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
584 */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
585 for (bits = 1; bits <= MAX_BITS; bits++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
586 code = (code + bl_count[bits-1]) << 1; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
587 next_code[bits] = (ush)code; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
588 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
589 /* Check that the bit counts in bl_count are consistent. The last code |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
590 * must be all ones. |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
591 */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
592 Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
593 "inconsistent bit counts"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
594 Tracev((stderr,"\ngen_codes: max_code %d ", max_code)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
595 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
596 for (n = 0; n <= max_code; n++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
597 int len = tree[n].Len; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
598 if (len == 0) continue; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
599 /* Now reverse the bits */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
600 tree[n].Code = (ush)bi_reverse(next_code[len]++, len); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
601 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
602 Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ", |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
603 n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1)); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
604 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
605 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
606 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
607 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
608 * Construct one Huffman tree and assigns the code bit strings and lengths. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
609 * Update the total bit length for the current block. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
610 * IN assertion: the field freq is set for all tree elements. |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
611 * OUT assertions: the fields len and code are set to the optimal bit length |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
612 * and corresponding code. The length opt_len is updated; static_len is |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
613 * also updated if stree is not null. The field max_code is set. |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
614 */ |
00d788dac91a
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parents:
diff
changeset
|
615 local void build_tree(s, desc) |
00d788dac91a
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parents:
diff
changeset
|
616 deflate_state *s; |
00d788dac91a
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parents:
diff
changeset
|
617 tree_desc *desc; /* the tree descriptor */ |
00d788dac91a
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parents:
diff
changeset
|
618 { |
00d788dac91a
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parents:
diff
changeset
|
619 ct_data *tree = desc->dyn_tree; |
00d788dac91a
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parents:
diff
changeset
|
620 const ct_data *stree = desc->stat_desc->static_tree; |
00d788dac91a
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parents:
diff
changeset
|
621 int elems = desc->stat_desc->elems; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
622 int n, m; /* iterate over heap elements */ |
00d788dac91a
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parents:
diff
changeset
|
623 int max_code = -1; /* largest code with non zero frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
624 int node; /* new node being created */ |
00d788dac91a
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parents:
diff
changeset
|
625 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
626 /* Construct the initial heap, with least frequent element in |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
627 * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1]. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
628 * heap[0] is not used. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
629 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
630 s->heap_len = 0, s->heap_max = HEAP_SIZE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
631 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
632 for (n = 0; n < elems; n++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
633 if (tree[n].Freq != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
634 s->heap[++(s->heap_len)] = max_code = n; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
635 s->depth[n] = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
636 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
637 tree[n].Len = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
638 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
639 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
640 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
641 /* The pkzip format requires that at least one distance code exists, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
642 * and that at least one bit should be sent even if there is only one |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
643 * possible code. So to avoid special checks later on we force at least |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
644 * two codes of non zero frequency. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
645 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
646 while (s->heap_len < 2) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
647 node = s->heap[++(s->heap_len)] = (max_code < 2 ? ++max_code : 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
648 tree[node].Freq = 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
649 s->depth[node] = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
650 s->opt_len--; if (stree) s->static_len -= stree[node].Len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
651 /* node is 0 or 1 so it does not have extra bits */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
652 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
653 desc->max_code = max_code; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
654 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
655 /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
656 * establish sub-heaps of increasing lengths: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
657 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
658 for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
659 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
660 /* Construct the Huffman tree by repeatedly combining the least two |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
661 * frequent nodes. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
662 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
663 node = elems; /* next internal node of the tree */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
664 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
665 pqremove(s, tree, n); /* n = node of least frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
666 m = s->heap[SMALLEST]; /* m = node of next least frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
667 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
668 s->heap[--(s->heap_max)] = n; /* keep the nodes sorted by frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
669 s->heap[--(s->heap_max)] = m; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
670 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
671 /* Create a new node father of n and m */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
672 tree[node].Freq = tree[n].Freq + tree[m].Freq; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
673 s->depth[node] = (uch)((s->depth[n] >= s->depth[m] ? |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
674 s->depth[n] : s->depth[m]) + 1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
675 tree[n].Dad = tree[m].Dad = (ush)node; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
676 #ifdef DUMP_BL_TREE |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
677 if (tree == s->bl_tree) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
678 fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)", |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
679 node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
680 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
681 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
682 /* and insert the new node in the heap */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
683 s->heap[SMALLEST] = node++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
684 pqdownheap(s, tree, SMALLEST); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
685 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
686 } while (s->heap_len >= 2); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
687 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
688 s->heap[--(s->heap_max)] = s->heap[SMALLEST]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
689 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
690 /* At this point, the fields freq and dad are set. We can now |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
691 * generate the bit lengths. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
692 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
693 gen_bitlen(s, (tree_desc *)desc); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
694 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
695 /* The field len is now set, we can generate the bit codes */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
696 gen_codes ((ct_data *)tree, max_code, s->bl_count); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
697 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
698 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
699 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
700 * Scan a literal or distance tree to determine the frequencies of the codes |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
701 * in the bit length tree. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
702 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
703 local void scan_tree (s, tree, max_code) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
704 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
705 ct_data *tree; /* the tree to be scanned */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
706 int max_code; /* and its largest code of non zero frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
707 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
708 int n; /* iterates over all tree elements */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
709 int prevlen = -1; /* last emitted length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
710 int curlen; /* length of current code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
711 int nextlen = tree[0].Len; /* length of next code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
712 int count = 0; /* repeat count of the current code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
713 int max_count = 7; /* max repeat count */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
714 int min_count = 4; /* min repeat count */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
715 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
716 if (nextlen == 0) max_count = 138, min_count = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
717 tree[max_code+1].Len = (ush)0xffff; /* guard */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
718 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
719 for (n = 0; n <= max_code; n++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
720 curlen = nextlen; nextlen = tree[n+1].Len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
721 if (++count < max_count && curlen == nextlen) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
722 continue; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
723 } else if (count < min_count) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
724 s->bl_tree[curlen].Freq += count; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
725 } else if (curlen != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
726 if (curlen != prevlen) s->bl_tree[curlen].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
727 s->bl_tree[REP_3_6].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
728 } else if (count <= 10) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
729 s->bl_tree[REPZ_3_10].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
730 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
731 s->bl_tree[REPZ_11_138].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
732 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
733 count = 0; prevlen = curlen; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
734 if (nextlen == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
735 max_count = 138, min_count = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
736 } else if (curlen == nextlen) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
737 max_count = 6, min_count = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
738 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
739 max_count = 7, min_count = 4; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
740 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
741 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
742 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
743 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
744 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
745 * Send a literal or distance tree in compressed form, using the codes in |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
746 * bl_tree. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
747 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
748 local void send_tree (s, tree, max_code) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
749 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
750 ct_data *tree; /* the tree to be scanned */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
751 int max_code; /* and its largest code of non zero frequency */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
752 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
753 int n; /* iterates over all tree elements */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
754 int prevlen = -1; /* last emitted length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
755 int curlen; /* length of current code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
756 int nextlen = tree[0].Len; /* length of next code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
757 int count = 0; /* repeat count of the current code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
758 int max_count = 7; /* max repeat count */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
759 int min_count = 4; /* min repeat count */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
760 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
761 /* tree[max_code+1].Len = -1; */ /* guard already set */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
762 if (nextlen == 0) max_count = 138, min_count = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
763 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
764 for (n = 0; n <= max_code; n++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
765 curlen = nextlen; nextlen = tree[n+1].Len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
766 if (++count < max_count && curlen == nextlen) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
767 continue; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
768 } else if (count < min_count) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
769 do { send_code(s, curlen, s->bl_tree); } while (--count != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
770 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
771 } else if (curlen != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
772 if (curlen != prevlen) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
773 send_code(s, curlen, s->bl_tree); count--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
774 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
775 Assert(count >= 3 && count <= 6, " 3_6?"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
776 send_code(s, REP_3_6, s->bl_tree); send_bits(s, count-3, 2); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
777 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
778 } else if (count <= 10) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
779 send_code(s, REPZ_3_10, s->bl_tree); send_bits(s, count-3, 3); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
780 |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
781 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
782 send_code(s, REPZ_11_138, s->bl_tree); send_bits(s, count-11, 7); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
783 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
784 count = 0; prevlen = curlen; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
785 if (nextlen == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
786 max_count = 138, min_count = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
787 } else if (curlen == nextlen) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
788 max_count = 6, min_count = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
789 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
790 max_count = 7, min_count = 4; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
791 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
792 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
793 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
794 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
795 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
796 * Construct the Huffman tree for the bit lengths and return the index in |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
797 * bl_order of the last bit length code to send. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
798 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
799 local int build_bl_tree(s) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
800 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
801 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
802 int max_blindex; /* index of last bit length code of non zero freq */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
803 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
804 /* Determine the bit length frequencies for literal and distance trees */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
805 scan_tree(s, (ct_data *)s->dyn_ltree, s->l_desc.max_code); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
806 scan_tree(s, (ct_data *)s->dyn_dtree, s->d_desc.max_code); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
807 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
808 /* Build the bit length tree: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
809 build_tree(s, (tree_desc *)(&(s->bl_desc))); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
810 /* opt_len now includes the length of the tree representations, except |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
811 * the lengths of the bit lengths codes and the 5+5+4 bits for the counts. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
812 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
813 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
814 /* Determine the number of bit length codes to send. The pkzip format |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
815 * requires that at least 4 bit length codes be sent. (appnote.txt says |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
816 * 3 but the actual value used is 4.) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
817 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
818 for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
819 if (s->bl_tree[bl_order[max_blindex]].Len != 0) break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
820 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
821 /* Update opt_len to include the bit length tree and counts */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
822 s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
823 Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld", |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
824 s->opt_len, s->static_len)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
825 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
826 return max_blindex; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
827 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
828 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
829 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
830 * Send the header for a block using dynamic Huffman trees: the counts, the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
831 * lengths of the bit length codes, the literal tree and the distance tree. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
832 * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
833 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
834 local void send_all_trees(s, lcodes, dcodes, blcodes) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
835 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
836 int lcodes, dcodes, blcodes; /* number of codes for each tree */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
837 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
838 int rank; /* index in bl_order */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
839 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
840 Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
841 Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
842 "too many codes"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
843 Tracev((stderr, "\nbl counts: ")); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
844 send_bits(s, lcodes-257, 5); /* not +255 as stated in appnote.txt */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
845 send_bits(s, dcodes-1, 5); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
846 send_bits(s, blcodes-4, 4); /* not -3 as stated in appnote.txt */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
847 for (rank = 0; rank < blcodes; rank++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
848 Tracev((stderr, "\nbl code %2d ", bl_order[rank])); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
849 send_bits(s, s->bl_tree[bl_order[rank]].Len, 3); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
850 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
851 Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
852 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
853 send_tree(s, (ct_data *)s->dyn_ltree, lcodes-1); /* literal tree */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
854 Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
855 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
856 send_tree(s, (ct_data *)s->dyn_dtree, dcodes-1); /* distance tree */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
857 Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
858 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
859 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
860 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
861 * Send a stored block |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
862 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
863 void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
864 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
865 charf *buf; /* input block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
866 ulg stored_len; /* length of input block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
867 int last; /* one if this is the last block for a file */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
868 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
869 send_bits(s, (STORED_BLOCK<<1)+last, 3); /* send block type */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
870 bi_windup(s); /* align on byte boundary */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
871 put_short(s, (ush)stored_len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
872 put_short(s, (ush)~stored_len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
873 zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
874 s->pending += stored_len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
875 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
876 s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
877 s->compressed_len += (stored_len + 4) << 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
878 s->bits_sent += 2*16; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
879 s->bits_sent += stored_len<<3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
880 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
881 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
882 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
883 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
884 * Flush the bits in the bit buffer to pending output (leaves at most 7 bits) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
885 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
886 void ZLIB_INTERNAL _tr_flush_bits(s) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
887 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
888 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
889 bi_flush(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
890 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
891 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
892 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
893 * Send one empty static block to give enough lookahead for inflate. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
894 * This takes 10 bits, of which 7 may remain in the bit buffer. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
895 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
896 void ZLIB_INTERNAL _tr_align(s) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
897 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
898 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
899 send_bits(s, STATIC_TREES<<1, 3); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
900 send_code(s, END_BLOCK, static_ltree); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
901 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
902 s->compressed_len += 10L; /* 3 for block type, 7 for EOB */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
903 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
904 bi_flush(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
905 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
906 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
907 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
908 * Determine the best encoding for the current block: dynamic trees, static |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
909 * trees or store, and write out the encoded block. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
910 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
911 void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
912 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
913 charf *buf; /* input block, or NULL if too old */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
914 ulg stored_len; /* length of input block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
915 int last; /* one if this is the last block for a file */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
916 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
917 ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
918 int max_blindex = 0; /* index of last bit length code of non zero freq */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
919 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
920 /* Build the Huffman trees unless a stored block is forced */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
921 if (s->level > 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
922 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
923 /* Check if the file is binary or text */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
924 if (s->strm->data_type == Z_UNKNOWN) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
925 s->strm->data_type = detect_data_type(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
926 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
927 /* Construct the literal and distance trees */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
928 build_tree(s, (tree_desc *)(&(s->l_desc))); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
929 Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
930 s->static_len)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
931 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
932 build_tree(s, (tree_desc *)(&(s->d_desc))); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
933 Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
934 s->static_len)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
935 /* At this point, opt_len and static_len are the total bit lengths of |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
936 * the compressed block data, excluding the tree representations. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
937 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
938 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
939 /* Build the bit length tree for the above two trees, and get the index |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
940 * in bl_order of the last bit length code to send. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
941 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
942 max_blindex = build_bl_tree(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
943 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
944 /* Determine the best encoding. Compute the block lengths in bytes. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
945 opt_lenb = (s->opt_len+3+7)>>3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
946 static_lenb = (s->static_len+3+7)>>3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
947 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
948 Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ", |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
949 opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
950 s->last_lit)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
951 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
952 if (static_lenb <= opt_lenb) opt_lenb = static_lenb; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
953 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
954 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
955 Assert(buf != (char*)0, "lost buf"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
956 opt_lenb = static_lenb = stored_len + 5; /* force a stored block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
957 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
958 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
959 #ifdef FORCE_STORED |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
960 if (buf != (char*)0) { /* force stored block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
961 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
962 if (stored_len+4 <= opt_lenb && buf != (char*)0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
963 /* 4: two words for the lengths */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
964 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
965 /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
966 * Otherwise we can't have processed more than WSIZE input bytes since |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
967 * the last block flush, because compression would have been |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
968 * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
969 * transform a block into a stored block. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
970 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
971 _tr_stored_block(s, buf, stored_len, last); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
972 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
973 #ifdef FORCE_STATIC |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
974 } else if (static_lenb >= 0) { /* force static trees */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
975 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
976 } else if (s->strategy == Z_FIXED || static_lenb == opt_lenb) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
977 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
978 send_bits(s, (STATIC_TREES<<1)+last, 3); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
979 compress_block(s, (const ct_data *)static_ltree, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
980 (const ct_data *)static_dtree); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
981 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
982 s->compressed_len += 3 + s->static_len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
983 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
984 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
985 send_bits(s, (DYN_TREES<<1)+last, 3); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
986 send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
987 max_blindex+1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
988 compress_block(s, (const ct_data *)s->dyn_ltree, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
989 (const ct_data *)s->dyn_dtree); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
990 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
991 s->compressed_len += 3 + s->opt_len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
992 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
993 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
994 Assert (s->compressed_len == s->bits_sent, "bad compressed size"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
995 /* The above check is made mod 2^32, for files larger than 512 MB |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
996 * and uLong implemented on 32 bits. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
997 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
998 init_block(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
999 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1000 if (last) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1001 bi_windup(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1002 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1003 s->compressed_len += 7; /* align on byte boundary */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1004 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1005 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1006 Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1007 s->compressed_len-7*last)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1008 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1009 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1010 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1011 * Save the match info and tally the frequency counts. Return true if |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1012 * the current block must be flushed. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1013 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1014 int ZLIB_INTERNAL _tr_tally (s, dist, lc) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1015 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1016 unsigned dist; /* distance of matched string */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1017 unsigned lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1018 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1019 s->d_buf[s->last_lit] = (ush)dist; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1020 s->l_buf[s->last_lit++] = (uch)lc; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1021 if (dist == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1022 /* lc is the unmatched char */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1023 s->dyn_ltree[lc].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1024 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1025 s->matches++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1026 /* Here, lc is the match length - MIN_MATCH */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1027 dist--; /* dist = match distance - 1 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1028 Assert((ush)dist < (ush)MAX_DIST(s) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1029 (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1030 (ush)d_code(dist) < (ush)D_CODES, "_tr_tally: bad match"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1031 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1032 s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1033 s->dyn_dtree[d_code(dist)].Freq++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1034 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1035 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1036 #ifdef TRUNCATE_BLOCK |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1037 /* Try to guess if it is profitable to stop the current block here */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1038 if ((s->last_lit & 0x1fff) == 0 && s->level > 2) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1039 /* Compute an upper bound for the compressed length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1040 ulg out_length = (ulg)s->last_lit*8L; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1041 ulg in_length = (ulg)((long)s->strstart - s->block_start); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1042 int dcode; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1043 for (dcode = 0; dcode < D_CODES; dcode++) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1044 out_length += (ulg)s->dyn_dtree[dcode].Freq * |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1045 (5L+extra_dbits[dcode]); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1046 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1047 out_length >>= 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1048 Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ", |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1049 s->last_lit, in_length, out_length, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1050 100L - out_length*100L/in_length)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1051 if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1052 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1053 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1054 return (s->last_lit == s->lit_bufsize-1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1055 /* We avoid equality with lit_bufsize because of wraparound at 64K |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1056 * on 16 bit machines and because stored blocks are restricted to |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1057 * 64K-1 bytes. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1058 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1059 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1060 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1061 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1062 * Send the block data compressed using the given Huffman trees |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1063 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1064 local void compress_block(s, ltree, dtree) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1065 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1066 const ct_data *ltree; /* literal tree */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1067 const ct_data *dtree; /* distance tree */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1068 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1069 unsigned dist; /* distance of matched string */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1070 int lc; /* match length or unmatched char (if dist == 0) */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1071 unsigned lx = 0; /* running index in l_buf */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1072 unsigned code; /* the code to send */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1073 int extra; /* number of extra bits to send */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1074 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1075 if (s->last_lit != 0) do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1076 dist = s->d_buf[lx]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1077 lc = s->l_buf[lx++]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1078 if (dist == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1079 send_code(s, lc, ltree); /* send a literal byte */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1080 Tracecv(isgraph(lc), (stderr," '%c' ", lc)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1081 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1082 /* Here, lc is the match length - MIN_MATCH */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1083 code = _length_code[lc]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1084 send_code(s, code+LITERALS+1, ltree); /* send the length code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1085 extra = extra_lbits[code]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1086 if (extra != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1087 lc -= base_length[code]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1088 send_bits(s, lc, extra); /* send the extra length bits */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1089 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1090 dist--; /* dist is now the match distance - 1 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1091 code = d_code(dist); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1092 Assert (code < D_CODES, "bad d_code"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1093 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1094 send_code(s, code, dtree); /* send the distance code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1095 extra = extra_dbits[code]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1096 if (extra != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1097 dist -= (unsigned)base_dist[code]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1098 send_bits(s, dist, extra); /* send the extra distance bits */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1099 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1100 } /* literal or match pair ? */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1101 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1102 /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1103 Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1104 "pendingBuf overflow"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1105 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1106 } while (lx < s->last_lit); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1107 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1108 send_code(s, END_BLOCK, ltree); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1109 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1110 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1111 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1112 * Check if the data type is TEXT or BINARY, using the following algorithm: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1113 * - TEXT if the two conditions below are satisfied: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1114 * a) There are no non-portable control characters belonging to the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1115 * "black list" (0..6, 14..25, 28..31). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1116 * b) There is at least one printable character belonging to the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1117 * "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1118 * - BINARY otherwise. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1119 * - The following partially-portable control characters form a |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1120 * "gray list" that is ignored in this detection algorithm: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1121 * (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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|
1122 * IN assertion: the fields Freq of dyn_ltree are set. |
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|
1123 */ |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
1124 local int detect_data_type(s) |
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Added support for reading gzipped ROMs
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parents:
diff
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|
1125 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1126 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1127 /* black_mask is the bit mask of black-listed bytes |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1128 * set bits 0..6, 14..25, and 28..31 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1129 * 0xf3ffc07f = binary 11110011111111111100000001111111 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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|
1130 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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|
1131 unsigned long black_mask = 0xf3ffc07fUL; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1132 int n; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
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|
1133 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1134 /* Check for non-textual ("black-listed") bytes. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1135 for (n = 0; n <= 31; n++, black_mask >>= 1) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1136 if ((black_mask & 1) && (s->dyn_ltree[n].Freq != 0)) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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|
1137 return Z_BINARY; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1138 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1139 /* Check for textual ("white-listed") bytes. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1140 if (s->dyn_ltree[9].Freq != 0 || s->dyn_ltree[10].Freq != 0 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
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|
1141 || s->dyn_ltree[13].Freq != 0) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1142 return Z_TEXT; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1143 for (n = 32; n < LITERALS; n++) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1144 if (s->dyn_ltree[n].Freq != 0) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1145 return Z_TEXT; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1146 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1147 /* There are no "black-listed" or "white-listed" bytes: |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1148 * this stream either is empty or has tolerated ("gray-listed") bytes only. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1149 */ |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1150 return Z_BINARY; |
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Michael Pavone <pavone@retrodev.com>
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|
1151 } |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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|
1152 |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1153 /* =========================================================================== |
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parents:
diff
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1154 * Reverse the first len bits of a code, using straightforward code (a faster |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
1155 * method would use a table) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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1156 * IN assertion: 1 <= len <= 15 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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|
1157 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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|
1158 local unsigned bi_reverse(code, len) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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|
1159 unsigned code; /* the value to invert */ |
00d788dac91a
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|
1160 int len; /* its bit length */ |
00d788dac91a
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diff
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|
1161 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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|
1162 register unsigned res = 0; |
00d788dac91a
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|
1163 do { |
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|
1164 res |= code & 1; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
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|
1165 code >>= 1, res <<= 1; |
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|
1166 } while (--len > 0); |
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parents:
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|
1167 return res >> 1; |
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parents:
diff
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|
1168 } |
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|
1169 |
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|
1170 /* =========================================================================== |
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|
1171 * Flush the bit buffer, keeping at most 7 bits in it. |
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parents:
diff
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1172 */ |
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parents:
diff
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|
1173 local void bi_flush(s) |
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parents:
diff
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|
1174 deflate_state *s; |
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parents:
diff
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|
1175 { |
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parents:
diff
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|
1176 if (s->bi_valid == 16) { |
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1177 put_short(s, s->bi_buf); |
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1178 s->bi_buf = 0; |
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|
1179 s->bi_valid = 0; |
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|
1180 } else if (s->bi_valid >= 8) { |
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|
1181 put_byte(s, (Byte)s->bi_buf); |
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parents:
diff
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|
1182 s->bi_buf >>= 8; |
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parents:
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|
1183 s->bi_valid -= 8; |
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parents:
diff
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|
1184 } |
00d788dac91a
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diff
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|
1185 } |
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parents:
diff
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|
1186 |
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parents:
diff
changeset
|
1187 /* =========================================================================== |
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parents:
diff
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|
1188 * Flush the bit buffer and align the output on a byte boundary |
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parents:
diff
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|
1189 */ |
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parents:
diff
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|
1190 local void bi_windup(s) |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
1191 deflate_state *s; |
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parents:
diff
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|
1192 { |
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Added support for reading gzipped ROMs
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parents:
diff
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|
1193 if (s->bi_valid > 8) { |
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Added support for reading gzipped ROMs
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parents:
diff
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|
1194 put_short(s, s->bi_buf); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
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|
1195 } else if (s->bi_valid > 0) { |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1196 put_byte(s, (Byte)s->bi_buf); |
00d788dac91a
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parents:
diff
changeset
|
1197 } |
00d788dac91a
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parents:
diff
changeset
|
1198 s->bi_buf = 0; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1199 s->bi_valid = 0; |
00d788dac91a
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parents:
diff
changeset
|
1200 #ifdef ZLIB_DEBUG |
00d788dac91a
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parents:
diff
changeset
|
1201 s->bits_sent = (s->bits_sent+7) & ~7; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1202 #endif |
00d788dac91a
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parents:
diff
changeset
|
1203 } |