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annotate zlib/inffast.c @ 1968:c16dabdb0aad

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megawifi: use util module socket functions for WIN32 compatibility
author doragasu <doragasu@hotmail.com>
date Fri, 08 May 2020 00:24:25 -0700
parents 00d788dac91a
children
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rev   line source
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1 /* inffast.c -- fast 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 #include "inflate.h"
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9 #include "inffast.h"
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10
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11 #ifdef ASMINF
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12 # pragma message("Assembler code may have bugs -- use at your own risk")
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13 #else
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14
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15 /*
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16 Decode literal, length, and distance codes and write out the resulting
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17 literal and match bytes until either not enough input or output is
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18 available, an end-of-block is encountered, or a data error is encountered.
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19 When large enough input and output buffers are supplied to inflate(), for
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20 example, a 16K input buffer and a 64K output buffer, more than 95% of the
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21 inflate execution time is spent in this routine.
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22
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23 Entry assumptions:
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24
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25 state->mode == LEN
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26 strm->avail_in >= 6
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27 strm->avail_out >= 258
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28 start >= strm->avail_out
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29 state->bits < 8
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30
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31 On return, state->mode is one of:
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32
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33 LEN -- ran out of enough output space or enough available input
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34 TYPE -- reached end of block code, inflate() to interpret next block
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35 BAD -- error in block data
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36
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37 Notes:
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38
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39 - The maximum input bits used by a length/distance pair is 15 bits for the
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40 length code, 5 bits for the length extra, 15 bits for the distance code,
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41 and 13 bits for the distance extra. This totals 48 bits, or six bytes.
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42 Therefore if strm->avail_in >= 6, then there is enough input to avoid
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43 checking for available input while decoding.
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44
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45 - The maximum bytes that a single length/distance pair can output is 258
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46 bytes, which is the maximum length that can be coded. inflate_fast()
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47 requires strm->avail_out >= 258 for each loop to avoid checking for
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48 output space.
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49 */
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50 void ZLIB_INTERNAL inflate_fast(strm, start)
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51 z_streamp strm;
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52 unsigned start; /* inflate()'s starting value for strm->avail_out */
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53 {
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54 struct inflate_state FAR *state;
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55 z_const unsigned char FAR *in; /* local strm->next_in */
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56 z_const unsigned char FAR *last; /* have enough input while in < last */
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57 unsigned char FAR *out; /* local strm->next_out */
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58 unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
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59 unsigned char FAR *end; /* while out < end, enough space available */
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60 #ifdef INFLATE_STRICT
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61 unsigned dmax; /* maximum distance from zlib header */
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62 #endif
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63 unsigned wsize; /* window size or zero if not using window */
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64 unsigned whave; /* valid bytes in the window */
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65 unsigned wnext; /* window write index */
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66 unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */
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67 unsigned long hold; /* local strm->hold */
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68 unsigned bits; /* local strm->bits */
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69 code const FAR *lcode; /* local strm->lencode */
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70 code const FAR *dcode; /* local strm->distcode */
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71 unsigned lmask; /* mask for first level of length codes */
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72 unsigned dmask; /* mask for first level of distance codes */
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73 code here; /* retrieved table entry */
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74 unsigned op; /* code bits, operation, extra bits, or */
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75 /* window position, window bytes to copy */
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76 unsigned len; /* match length, unused bytes */
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77 unsigned dist; /* match distance */
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78 unsigned char FAR *from; /* where to copy match from */
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79
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80 /* copy state to local variables */
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81 state = (struct inflate_state FAR *)strm->state;
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82 in = strm->next_in;
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83 last = in + (strm->avail_in - 5);
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84 out = strm->next_out;
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85 beg = out - (start - strm->avail_out);
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86 end = out + (strm->avail_out - 257);
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87 #ifdef INFLATE_STRICT
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88 dmax = state->dmax;
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89 #endif
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90 wsize = state->wsize;
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91 whave = state->whave;
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92 wnext = state->wnext;
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93 window = state->window;
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94 hold = state->hold;
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95 bits = state->bits;
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96 lcode = state->lencode;
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97 dcode = state->distcode;
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98 lmask = (1U << state->lenbits) - 1;
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99 dmask = (1U << state->distbits) - 1;
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100
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101 /* decode literals and length/distances until end-of-block or not enough
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102 input data or output space */
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103 do {
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104 if (bits < 15) {
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105 hold += (unsigned long)(*in++) << bits;
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106 bits += 8;
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107 hold += (unsigned long)(*in++) << bits;
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108 bits += 8;
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109 }
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110 here = lcode[hold & lmask];
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111 dolen:
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112 op = (unsigned)(here.bits);
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113 hold >>= op;
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114 bits -= op;
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115 op = (unsigned)(here.op);
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116 if (op == 0) { /* literal */
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117 Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
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118 "inflate: literal '%c'\n" :
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119 "inflate: literal 0x%02x\n", here.val));
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120 *out++ = (unsigned char)(here.val);
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121 }
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122 else if (op & 16) { /* length base */
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123 len = (unsigned)(here.val);
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124 op &= 15; /* number of extra bits */
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125 if (op) {
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126 if (bits < op) {
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127 hold += (unsigned long)(*in++) << bits;
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128 bits += 8;
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129 }
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130 len += (unsigned)hold & ((1U << op) - 1);
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131 hold >>= op;
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132 bits -= op;
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133 }
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134 Tracevv((stderr, "inflate: length %u\n", len));
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135 if (bits < 15) {
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136 hold += (unsigned long)(*in++) << bits;
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137 bits += 8;
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138 hold += (unsigned long)(*in++) << bits;
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139 bits += 8;
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140 }
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141 here = dcode[hold & dmask];
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142 dodist:
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diff changeset
143 op = (unsigned)(here.bits);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144 hold >>= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
145 bits -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 op = (unsigned)(here.op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 if (op & 16) { /* distance base */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 dist = (unsigned)(here.val);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 op &= 15; /* number of extra bits */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 if (bits < op) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 hold += (unsigned long)(*in++) << bits;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 bits += 8;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 if (bits < op) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 hold += (unsigned long)(*in++) << bits;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 bits += 8;
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 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 dist += (unsigned)hold & ((1U << op) - 1);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 #ifdef INFLATE_STRICT
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 if (dist > dmax) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 strm->msg = (char *)"invalid distance too far back";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 #endif
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 hold >>= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 bits -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 Tracevv((stderr, "inflate: distance %u\n", dist));
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 op = (unsigned)(out - beg); /* max distance in output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 if (dist > op) { /* see if copy from window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 op = dist - op; /* distance back in window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 if (op > whave) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 if (state->sane) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 strm->msg =
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 (char *)"invalid distance too far back";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 break;
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 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 if (len <= op - whave) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 *out++ = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 } while (--len);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 continue;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 len -= op - whave;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 *out++ = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 } while (--op > whave);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 if (op == 0) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 from = out - dist;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 } while (--len);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 continue;
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 #endif
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 from = window;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 if (wnext == 0) { /* very common case */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 from += wsize - op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 if (op < len) { /* some from window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 from = out - dist; /* rest from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 else if (wnext < op) { /* wrap around window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 from += wsize + wnext - op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212 op -= wnext;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 if (op < len) { /* some from end of window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 from = window;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 if (wnext < len) { /* some from start of window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 op = wnext;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 from = out - dist; /* rest from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 }
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 else { /* contiguous in window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 from += wnext - op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 if (op < len) { /* some from window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 from = out - dist; /* rest from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 }
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 while (len > 2) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243 len -= 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
244 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
245 if (len) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
246 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
247 if (len > 1)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
248 *out++ = *from++;
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 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
251 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
252 from = out - dist; /* copy direct from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
253 do { /* minimum length is three */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
254 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
255 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
256 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
257 len -= 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
258 } while (len > 2);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
259 if (len) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
260 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
261 if (len > 1)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
262 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
263 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
264 }
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 else if ((op & 64) == 0) { /* 2nd level distance code */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
267 here = dcode[here.val + (hold & ((1U << op) - 1))];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
268 goto dodist;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
269 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
270 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
271 strm->msg = (char *)"invalid distance code";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
272 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
273 break;
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 else if ((op & 64) == 0) { /* 2nd level length code */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
277 here = lcode[here.val + (hold & ((1U << op) - 1))];
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
278 goto dolen;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
279 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
280 else if (op & 32) { /* end-of-block */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
281 Tracevv((stderr, "inflate: end of block\n"));
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
282 state->mode = TYPE;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
283 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
284 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
285 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
286 strm->msg = (char *)"invalid literal/length code";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
287 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
288 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
289 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
290 } while (in < last && out < end);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
291
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
292 /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
293 len = bits >> 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
294 in -= len;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
295 bits -= len << 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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296 hold &= (1U << bits) - 1;
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297
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298 /* update state and return */
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299 strm->next_in = in;
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300 strm->next_out = out;
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301 strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
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302 strm->avail_out = (unsigned)(out < end ?
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303 257 + (end - out) : 257 - (out - end));
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304 state->hold = hold;
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305 state->bits = bits;
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306 return;
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307 }
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308
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309 /*
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310 inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe):
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311 - Using bit fields for code structure
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312 - Different op definition to avoid & for extra bits (do & for table bits)
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313 - Three separate decoding do-loops for direct, window, and wnext == 0
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314 - Special case for distance > 1 copies to do overlapped load and store copy
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315 - Explicit branch predictions (based on measured branch probabilities)
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316 - Deferring match copy and interspersed it with decoding subsequent codes
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317 - Swapping literal/length else
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318 - Swapping window/direct else
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319 - Larger unrolled copy loops (three is about right)
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320 - Moving len -= 3 statement into middle of loop
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321 */
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322
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323 #endif /* !ASMINF */