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annotate zlib/inffast.c @ 2690:9ef72ee5c0b0

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Update vendored zlib to 1.3.1
author Michael Pavone <pavone@retrodev.com>
date Sun, 15 Jun 2025 15:39:33 -0700
parents 00d788dac91a
children
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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(z_streamp strm, unsigned start) {
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51 struct inflate_state FAR *state;
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52 z_const unsigned char FAR *in; /* local strm->next_in */
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53 z_const unsigned char FAR *last; /* have enough input while in < last */
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54 unsigned char FAR *out; /* local strm->next_out */
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55 unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
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56 unsigned char FAR *end; /* while out < end, enough space available */
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57 #ifdef INFLATE_STRICT
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58 unsigned dmax; /* maximum distance from zlib header */
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59 #endif
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60 unsigned wsize; /* window size or zero if not using window */
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61 unsigned whave; /* valid bytes in the window */
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62 unsigned wnext; /* window write index */
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63 unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */
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64 unsigned long hold; /* local strm->hold */
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65 unsigned bits; /* local strm->bits */
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66 code const FAR *lcode; /* local strm->lencode */
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67 code const FAR *dcode; /* local strm->distcode */
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68 unsigned lmask; /* mask for first level of length codes */
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69 unsigned dmask; /* mask for first level of distance codes */
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70 code const *here; /* retrieved table entry */
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71 unsigned op; /* code bits, operation, extra bits, or */
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72 /* window position, window bytes to copy */
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73 unsigned len; /* match length, unused bytes */
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74 unsigned dist; /* match distance */
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75 unsigned char FAR *from; /* where to copy match from */
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76
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77 /* copy state to local variables */
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78 state = (struct inflate_state FAR *)strm->state;
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79 in = strm->next_in;
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80 last = in + (strm->avail_in - 5);
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81 out = strm->next_out;
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82 beg = out - (start - strm->avail_out);
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83 end = out + (strm->avail_out - 257);
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84 #ifdef INFLATE_STRICT
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85 dmax = state->dmax;
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86 #endif
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87 wsize = state->wsize;
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88 whave = state->whave;
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89 wnext = state->wnext;
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90 window = state->window;
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91 hold = state->hold;
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92 bits = state->bits;
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93 lcode = state->lencode;
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94 dcode = state->distcode;
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95 lmask = (1U << state->lenbits) - 1;
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96 dmask = (1U << state->distbits) - 1;
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97
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98 /* decode literals and length/distances until end-of-block or not enough
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99 input data or output space */
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100 do {
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101 if (bits < 15) {
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102 hold += (unsigned long)(*in++) << bits;
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103 bits += 8;
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104 hold += (unsigned long)(*in++) << bits;
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105 bits += 8;
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106 }
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107 here = lcode + (hold & lmask);
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108 dolen:
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109 op = (unsigned)(here->bits);
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110 hold >>= op;
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111 bits -= op;
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112 op = (unsigned)(here->op);
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113 if (op == 0) { /* literal */
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114 Tracevv((stderr, here->val >= 0x20 && here->val < 0x7f ?
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115 "inflate: literal '%c'\n" :
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116 "inflate: literal 0x%02x\n", here->val));
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117 *out++ = (unsigned char)(here->val);
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118 }
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119 else if (op & 16) { /* length base */
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120 len = (unsigned)(here->val);
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121 op &= 15; /* number of extra bits */
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122 if (op) {
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123 if (bits < op) {
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124 hold += (unsigned long)(*in++) << bits;
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125 bits += 8;
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126 }
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127 len += (unsigned)hold & ((1U << op) - 1);
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128 hold >>= op;
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129 bits -= op;
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130 }
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131 Tracevv((stderr, "inflate: length %u\n", len));
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132 if (bits < 15) {
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133 hold += (unsigned long)(*in++) << bits;
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134 bits += 8;
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135 hold += (unsigned long)(*in++) << bits;
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136 bits += 8;
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137 }
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138 here = dcode + (hold & dmask);
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139 dodist:
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140 op = (unsigned)(here->bits);
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diff changeset
141 hold >>= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 bits -= op;
2690
9ef72ee5c0b0 Update vendored zlib to 1.3.1
Michael Pavone <pavone@retrodev.com>
parents: 1530
diff changeset
143 op = (unsigned)(here->op);
1530
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
144 if (op & 16) { /* distance base */
2690
9ef72ee5c0b0 Update vendored zlib to 1.3.1
Michael Pavone <pavone@retrodev.com>
parents: 1530
diff changeset
145 dist = (unsigned)(here->val);
1530
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 op &= 15; /* number of extra bits */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 if (bits < op) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 hold += (unsigned long)(*in++) << bits;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 bits += 8;
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 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 dist += (unsigned)hold & ((1U << op) - 1);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 #ifdef INFLATE_STRICT
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 if (dist > dmax) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 strm->msg = (char *)"invalid distance too far back";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 #endif
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 hold >>= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 bits -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 Tracevv((stderr, "inflate: distance %u\n", dist));
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 op = (unsigned)(out - beg); /* max distance in output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 if (dist > op) { /* see if copy from window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 op = dist - op; /* distance back in window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 if (op > whave) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 if (state->sane) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 strm->msg =
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 (char *)"invalid distance too far back";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 if (len <= op - whave) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179 *out++ = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 } while (--len);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 continue;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 len -= op - whave;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 *out++ = 0;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 } while (--op > whave);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 if (op == 0) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 from = out - dist;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 } while (--len);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 continue;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 #endif
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 from = window;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197 if (wnext == 0) { /* very common case */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 from += wsize - op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 if (op < len) { /* some from window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 from = out - dist; /* rest from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 else if (wnext < op) { /* wrap around window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 from += wsize + wnext - op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 op -= wnext;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 if (op < len) { /* some from end of window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 from = window;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 if (wnext < len) { /* some from start of window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 op = wnext;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 from = out - dist; /* rest from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 }
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 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 else { /* contiguous in window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 from += wnext - op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228 if (op < len) { /* some from window */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229 len -= op;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 do {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 } while (--op);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 from = out - dist; /* rest from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 while (len > 2) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 len -= 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 if (len) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
244 if (len > 1)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
245 *out++ = *from++;
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 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
248 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
249 from = out - dist; /* copy direct from output */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
250 do { /* minimum length is three */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
251 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
252 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
253 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
254 len -= 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
255 } while (len > 2);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
256 if (len) {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
257 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
258 if (len > 1)
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
259 *out++ = *from++;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
260 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
261 }
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 else if ((op & 64) == 0) { /* 2nd level distance code */
2690
9ef72ee5c0b0 Update vendored zlib to 1.3.1
Michael Pavone <pavone@retrodev.com>
parents: 1530
diff changeset
264 here = dcode + here->val + (hold & ((1U << op) - 1));
1530
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
265 goto dodist;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
266 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
267 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
268 strm->msg = (char *)"invalid distance code";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
269 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
270 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
271 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
272 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
273 else if ((op & 64) == 0) { /* 2nd level length code */
2690
9ef72ee5c0b0 Update vendored zlib to 1.3.1
Michael Pavone <pavone@retrodev.com>
parents: 1530
diff changeset
274 here = lcode + here->val + (hold & ((1U << op) - 1));
1530
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
275 goto dolen;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
276 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
277 else if (op & 32) { /* end-of-block */
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
278 Tracevv((stderr, "inflate: end of block\n"));
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
279 state->mode = TYPE;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
280 break;
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 else {
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
283 strm->msg = (char *)"invalid literal/length code";
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
284 state->mode = BAD;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
285 break;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
286 }
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
287 } while (in < last && out < end);
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
288
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
289 /* 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
290 len = bits >> 3;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
291 in -= len;
00d788dac91a Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
292 bits -= len << 3;
00d788dac91a Added support for reading gzipped ROMs
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293 hold &= (1U << bits) - 1;
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294
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295 /* update state and return */
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296 strm->next_in = in;
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297 strm->next_out = out;
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298 strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
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299 strm->avail_out = (unsigned)(out < end ?
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300 257 + (end - out) : 257 - (out - end));
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301 state->hold = hold;
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302 state->bits = bits;
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303 return;
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304 }
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305
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306 /*
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307 inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe):
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308 - Using bit fields for code structure
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309 - Different op definition to avoid & for extra bits (do & for table bits)
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310 - Three separate decoding do-loops for direct, window, and wnext == 0
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311 - Special case for distance > 1 copies to do overlapped load and store copy
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312 - Explicit branch predictions (based on measured branch probabilities)
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313 - Deferring match copy and interspersed it with decoding subsequent codes
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314 - Swapping literal/length else
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315 - Swapping window/direct else
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316 - Larger unrolled copy loops (three is about right)
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317 - Moving len -= 3 statement into middle of loop
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318 */
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319
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320 #endif /* !ASMINF */