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annotate zlib/inftrees.c @ 1971:80920c21bb52

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Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame
author Michael Pavone <pavone@retrodev.com>
date Fri, 08 May 2020 11:40:30 -0700
parents 00d788dac91a
children
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1 /* inftrees.c -- generate Huffman trees for efficient decoding
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2 * Copyright (C) 1995-2017 Mark Adler
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3 * For conditions of distribution and use, see copyright notice in zlib.h
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4 */
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5
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6 #include "zutil.h"
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7 #include "inftrees.h"
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8
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9 #define MAXBITS 15
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10
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11 const char inflate_copyright[] =
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12 " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
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13 /*
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14 If you use the zlib library in a product, an acknowledgment is welcome
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15 in the documentation of your product. If for some reason you cannot
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16 include such an acknowledgment, I would appreciate that you keep this
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17 copyright string in the executable of your product.
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18 */
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19
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20 /*
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21 Build a set of tables to decode the provided canonical Huffman code.
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22 The code lengths are lens[0..codes-1]. The result starts at *table,
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23 whose indices are 0..2^bits-1. work is a writable array of at least
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24 lens shorts, which is used as a work area. type is the type of code
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25 to be generated, CODES, LENS, or DISTS. On return, zero is success,
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26 -1 is an invalid code, and +1 means that ENOUGH isn't enough. table
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27 on return points to the next available entry's address. bits is the
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28 requested root table index bits, and on return it is the actual root
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29 table index bits. It will differ if the request is greater than the
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30 longest code or if it is less than the shortest code.
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31 */
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32 int ZLIB_INTERNAL inflate_table(type, lens, codes, table, bits, work)
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33 codetype type;
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34 unsigned short FAR *lens;
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35 unsigned codes;
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36 code FAR * FAR *table;
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37 unsigned FAR *bits;
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38 unsigned short FAR *work;
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39 {
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40 unsigned len; /* a code's length in bits */
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41 unsigned sym; /* index of code symbols */
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42 unsigned min, max; /* minimum and maximum code lengths */
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43 unsigned root; /* number of index bits for root table */
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44 unsigned curr; /* number of index bits for current table */
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45 unsigned drop; /* code bits to drop for sub-table */
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46 int left; /* number of prefix codes available */
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47 unsigned used; /* code entries in table used */
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48 unsigned huff; /* Huffman code */
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49 unsigned incr; /* for incrementing code, index */
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50 unsigned fill; /* index for replicating entries */
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51 unsigned low; /* low bits for current root entry */
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52 unsigned mask; /* mask for low root bits */
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53 code here; /* table entry for duplication */
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54 code FAR *next; /* next available space in table */
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55 const unsigned short FAR *base; /* base value table to use */
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56 const unsigned short FAR *extra; /* extra bits table to use */
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57 unsigned match; /* use base and extra for symbol >= match */
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58 unsigned short count[MAXBITS+1]; /* number of codes of each length */
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59 unsigned short offs[MAXBITS+1]; /* offsets in table for each length */
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60 static const unsigned short lbase[31] = { /* Length codes 257..285 base */
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61 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
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62 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
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63 static const unsigned short lext[31] = { /* Length codes 257..285 extra */
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64 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
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65 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
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66 static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
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67 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
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68 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
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69 8193, 12289, 16385, 24577, 0, 0};
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70 static const unsigned short dext[32] = { /* Distance codes 0..29 extra */
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71 16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
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72 23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
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73 28, 28, 29, 29, 64, 64};
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74
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75 /*
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76 Process a set of code lengths to create a canonical Huffman code. The
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77 code lengths are lens[0..codes-1]. Each length corresponds to the
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78 symbols 0..codes-1. The Huffman code is generated by first sorting the
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79 symbols by length from short to long, and retaining the symbol order
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80 for codes with equal lengths. Then the code starts with all zero bits
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81 for the first code of the shortest length, and the codes are integer
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82 increments for the same length, and zeros are appended as the length
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83 increases. For the deflate format, these bits are stored backwards
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84 from their more natural integer increment ordering, and so when the
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85 decoding tables are built in the large loop below, the integer codes
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86 are incremented backwards.
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87
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88 This routine assumes, but does not check, that all of the entries in
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89 lens[] are in the range 0..MAXBITS. The caller must assure this.
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90 1..MAXBITS is interpreted as that code length. zero means that that
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91 symbol does not occur in this code.
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92
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93 The codes are sorted by computing a count of codes for each length,
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94 creating from that a table of starting indices for each length in the
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95 sorted table, and then entering the symbols in order in the sorted
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96 table. The sorted table is work[], with that space being provided by
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97 the caller.
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98
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99 The length counts are used for other purposes as well, i.e. finding
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100 the minimum and maximum length codes, determining if there are any
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101 codes at all, checking for a valid set of lengths, and looking ahead
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102 at length counts to determine sub-table sizes when building the
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103 decoding tables.
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104 */
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105
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106 /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
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107 for (len = 0; len <= MAXBITS; len++)
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108 count[len] = 0;
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109 for (sym = 0; sym < codes; sym++)
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110 count[lens[sym]]++;
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111
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112 /* bound code lengths, force root to be within code lengths */
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113 root = *bits;
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114 for (max = MAXBITS; max >= 1; max--)
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115 if (count[max] != 0) break;
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116 if (root > max) root = max;
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117 if (max == 0) { /* no symbols to code at all */
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118 here.op = (unsigned char)64; /* invalid code marker */
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119 here.bits = (unsigned char)1;
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120 here.val = (unsigned short)0;
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121 *(*table)++ = here; /* make a table to force an error */
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122 *(*table)++ = here;
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123 *bits = 1;
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124 return 0; /* no symbols, but wait for decoding to report error */
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125 }
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126 for (min = 1; min < max; min++)
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127 if (count[min] != 0) break;
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128 if (root < min) root = min;
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129
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130 /* check for an over-subscribed or incomplete set of lengths */
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131 left = 1;
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132 for (len = 1; len <= MAXBITS; len++) {
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133 left <<= 1;
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134 left -= count[len];
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135 if (left < 0) return -1; /* over-subscribed */
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136 }
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137 if (left > 0 && (type == CODES || max != 1))
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 return -1; /* incomplete set */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 /* generate offsets into symbol table for each length for sorting */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 offs[1] = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 for (len = 1; len < MAXBITS; len++)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
143 offs[len + 1] = offs[len] + count[len];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
145 /* sort symbols by length, by symbol order within each length */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 for (sym = 0; sym < codes; sym++)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 /*
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 Create and fill in decoding tables. In this loop, the table being
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 filled is at next and has curr index bits. The code being used is huff
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 with length len. That code is converted to an index by dropping drop
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 bits off of the bottom. For codes where len is less than drop + curr,
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 those top drop + curr - len bits are incremented through all values to
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 fill the table with replicated entries.
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 root is the number of index bits for the root table. When len exceeds
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 root, sub-tables are created pointed to by the root entry with an index
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 of the low root bits of huff. This is saved in low to check for when a
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 new sub-table should be started. drop is zero when the root table is
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 being filled, and drop is root when sub-tables are being filled.
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 When a new sub-table is needed, it is necessary to look ahead in the
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 code lengths to determine what size sub-table is needed. The length
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 counts are used for this, and so count[] is decremented as codes are
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 entered in the tables.
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 used keeps track of how many table entries have been allocated from the
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 provided *table space. It is checked for LENS and DIST tables against
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 the initial root table size constants. See the comments in inftrees.h
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 for more information.
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 sym increments through all symbols, and the loop terminates when
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 all codes of length max, i.e. all codes, have been processed. This
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 routine permits incomplete codes, so another loop after this one fills
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 in the rest of the decoding tables with invalid code markers.
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 /* set up for code type */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 switch (type) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 case CODES:
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 base = extra = work; /* dummy value--not used */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 match = 20;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 case LENS:
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 base = lbase;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 extra = lext;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 match = 257;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 default: /* DISTS */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 base = dbase;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 extra = dext;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 match = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197 /* initialize state for loop */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 huff = 0; /* starting code */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 sym = 0; /* starting code symbol */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 len = min; /* starting code length */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 next = *table; /* current table to fill in */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 curr = root; /* current table index bits */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 drop = 0; /* current bits to drop from code for index */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 low = (unsigned)(-1); /* trigger new sub-table when len > root */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 used = 1U << root; /* use root table entries */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 mask = used - 1; /* mask for comparing low */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 /* check available table space */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 if ((type == LENS && used > ENOUGH_LENS) ||
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 (type == DISTS && used > ENOUGH_DISTS))
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 return 1;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 /* process all codes and make table entries */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 for (;;) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 /* create table entry */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 here.bits = (unsigned char)(len - drop);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 if (work[sym] + 1U < match) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 here.op = (unsigned char)0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 here.val = work[sym];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 else if (work[sym] >= match) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 here.op = (unsigned char)(extra[work[sym] - match]);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 here.val = base[work[sym] - match];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 here.op = (unsigned char)(32 + 64); /* end of block */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 here.val = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 /* replicate for those indices with low len bits equal to huff */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 incr = 1U << (len - drop);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 fill = 1U << curr;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 min = fill; /* save offset to next table */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 fill -= incr;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 next[(huff >> drop) + fill] = here;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 } while (fill != 0);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 /* backwards increment the len-bit code huff */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 incr = 1U << (len - 1);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 while (huff & incr)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 incr >>= 1;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243 if (incr != 0) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
244 huff &= incr - 1;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
245 huff += incr;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
246 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
247 else
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
248 huff = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
249
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
250 /* go to next symbol, update count, len */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
251 sym++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
252 if (--(count[len]) == 0) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
253 if (len == max) break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
254 len = lens[work[sym]];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
255 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
256
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
257 /* create new sub-table if needed */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
258 if (len > root && (huff & mask) != low) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
259 /* if first time, transition to sub-tables */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
260 if (drop == 0)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
261 drop = root;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
262
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
263 /* increment past last table */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
264 next += min; /* here min is 1 << curr */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
265
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
266 /* determine length of next table */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
267 curr = len - drop;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
268 left = (int)(1 << curr);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
269 while (curr + drop < max) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
270 left -= count[curr + drop];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
271 if (left <= 0) break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
272 curr++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
273 left <<= 1;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
274 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
275
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
276 /* check for enough space */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
277 used += 1U << curr;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
278 if ((type == LENS && used > ENOUGH_LENS) ||
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
279 (type == DISTS && used > ENOUGH_DISTS))
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
280 return 1;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
281
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
282 /* point entry in root table to sub-table */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
283 low = huff & mask;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
284 (*table)[low].op = (unsigned char)curr;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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285 (*table)[low].bits = (unsigned char)root;
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286 (*table)[low].val = (unsigned short)(next - *table);
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287 }
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288 }
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289
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290 /* fill in remaining table entry if code is incomplete (guaranteed to have
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291 at most one remaining entry, since if the code is incomplete, the
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292 maximum code length that was allowed to get this far is one bit) */
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293 if (huff != 0) {
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294 here.op = (unsigned char)64; /* invalid code marker */
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295 here.bits = (unsigned char)(len - drop);
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296 here.val = (unsigned short)0;
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297 next[huff] = here;
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298 }
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299
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300 /* set return parameters */
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301 *table += used;
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302 *bits = root;
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303 return 0;
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304 }