Mercurial > cpython-lru_cache-weakref

annotate Modules/zlib/inffast.c @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 81fa47d2d477
children 467019588fcc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
36186
81fa47d2d477 Import zlib into Python tree.
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1 /* inffast.c -- fast decoding
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2 * Copyright (C) 1995-2004 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 #ifndef ASMINF
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12
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13 /* Allow machine dependent optimization for post-increment or pre-increment.
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14 Based on testing to date,
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15 Pre-increment preferred for:
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16 - PowerPC G3 (Adler)
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17 - MIPS R5000 (Randers-Pehrson)
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18 Post-increment preferred for:
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19 - none
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20 No measurable difference:
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21 - Pentium III (Anderson)
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22 - M68060 (Nikl)
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23 */
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24 #ifdef POSTINC
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25 # define OFF 0
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26 # define PUP(a) *(a)++
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27 #else
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28 # define OFF 1
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29 # define PUP(a) *++(a)
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30 #endif
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31
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32 /*
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33 Decode literal, length, and distance codes and write out the resulting
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34 literal and match bytes until either not enough input or output is
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35 available, an end-of-block is encountered, or a data error is encountered.
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36 When large enough input and output buffers are supplied to inflate(), for
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37 example, a 16K input buffer and a 64K output buffer, more than 95% of the
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38 inflate execution time is spent in this routine.
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39
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40 Entry assumptions:
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41
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42 state->mode == LEN
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43 strm->avail_in >= 6
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44 strm->avail_out >= 258
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45 start >= strm->avail_out
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46 state->bits < 8
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47
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48 On return, state->mode is one of:
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49
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50 LEN -- ran out of enough output space or enough available input
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51 TYPE -- reached end of block code, inflate() to interpret next block
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52 BAD -- error in block data
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53
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54 Notes:
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55
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56 - The maximum input bits used by a length/distance pair is 15 bits for the
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57 length code, 5 bits for the length extra, 15 bits for the distance code,
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58 and 13 bits for the distance extra. This totals 48 bits, or six bytes.
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59 Therefore if strm->avail_in >= 6, then there is enough input to avoid
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60 checking for available input while decoding.
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61
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62 - The maximum bytes that a single length/distance pair can output is 258
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63 bytes, which is the maximum length that can be coded. inflate_fast()
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64 requires strm->avail_out >= 258 for each loop to avoid checking for
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65 output space.
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66 */
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67 void inflate_fast(strm, start)
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68 z_streamp strm;
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69 unsigned start; /* inflate()'s starting value for strm->avail_out */
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70 {
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71 struct inflate_state FAR *state;
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72 unsigned char FAR *in; /* local strm->next_in */
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73 unsigned char FAR *last; /* while in < last, enough input available */
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74 unsigned char FAR *out; /* local strm->next_out */
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75 unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
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76 unsigned char FAR *end; /* while out < end, enough space available */
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77 #ifdef INFLATE_STRICT
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78 unsigned dmax; /* maximum distance from zlib header */
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79 #endif
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80 unsigned wsize; /* window size or zero if not using window */
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81 unsigned whave; /* valid bytes in the window */
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82 unsigned write; /* window write index */
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83 unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */
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84 unsigned long hold; /* local strm->hold */
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85 unsigned bits; /* local strm->bits */
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86 code const FAR *lcode; /* local strm->lencode */
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87 code const FAR *dcode; /* local strm->distcode */
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88 unsigned lmask; /* mask for first level of length codes */
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89 unsigned dmask; /* mask for first level of distance codes */
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90 code this; /* retrieved table entry */
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91 unsigned op; /* code bits, operation, extra bits, or */
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92 /* window position, window bytes to copy */
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93 unsigned len; /* match length, unused bytes */
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94 unsigned dist; /* match distance */
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95 unsigned char FAR *from; /* where to copy match from */
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96
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97 /* copy state to local variables */
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98 state = (struct inflate_state FAR *)strm->state;
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99 in = strm->next_in - OFF;
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100 last = in + (strm->avail_in - 5);
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101 out = strm->next_out - OFF;
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102 beg = out - (start - strm->avail_out);
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103 end = out + (strm->avail_out - 257);
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104 #ifdef INFLATE_STRICT
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105 dmax = state->dmax;
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106 #endif
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107 wsize = state->wsize;
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108 whave = state->whave;
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109 write = state->write;
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110 window = state->window;
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111 hold = state->hold;
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112 bits = state->bits;
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113 lcode = state->lencode;
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114 dcode = state->distcode;
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115 lmask = (1U << state->lenbits) - 1;
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116 dmask = (1U << state->distbits) - 1;
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117
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118 /* decode literals and length/distances until end-of-block or not enough
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119 input data or output space */
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120 do {
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121 if (bits < 15) {
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122 hold += (unsigned long)(PUP(in)) << bits;
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123 bits += 8;
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124 hold += (unsigned long)(PUP(in)) << bits;
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125 bits += 8;
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126 }
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127 this = lcode[hold & lmask];
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128 dolen:
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129 op = (unsigned)(this.bits);
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130 hold >>= op;
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131 bits -= op;
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132 op = (unsigned)(this.op);
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133 if (op == 0) { /* literal */
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134 Tracevv((stderr, this.val >= 0x20 && this.val < 0x7f ?
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135 "inflate: literal '%c'\n" :
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136 "inflate: literal 0x%02x\n", this.val));
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137 PUP(out) = (unsigned char)(this.val);
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138 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
139 else if (op & 16) { /* length base */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
140 len = (unsigned)(this.val);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
141 op &= 15; /* number of extra bits */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
142 if (op) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
143 if (bits < op) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
144 hold += (unsigned long)(PUP(in)) << bits;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
145 bits += 8;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
146 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
147 len += (unsigned)hold & ((1U << op) - 1);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
148 hold >>= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
149 bits -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
150 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
151 Tracevv((stderr, "inflate: length %u\n", len));
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
152 if (bits < 15) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
153 hold += (unsigned long)(PUP(in)) << bits;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
154 bits += 8;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
155 hold += (unsigned long)(PUP(in)) << bits;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
156 bits += 8;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
157 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
158 this = dcode[hold & dmask];
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
159 dodist:
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
160 op = (unsigned)(this.bits);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
161 hold >>= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
162 bits -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
163 op = (unsigned)(this.op);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
164 if (op & 16) { /* distance base */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
165 dist = (unsigned)(this.val);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
166 op &= 15; /* number of extra bits */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
167 if (bits < op) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
168 hold += (unsigned long)(PUP(in)) << bits;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
169 bits += 8;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
170 if (bits < op) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
171 hold += (unsigned long)(PUP(in)) << bits;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
172 bits += 8;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
173 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
174 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
175 dist += (unsigned)hold & ((1U << op) - 1);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
176 #ifdef INFLATE_STRICT
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
177 if (dist > dmax) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
178 strm->msg = (char *)"invalid distance too far back";
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
179 state->mode = BAD;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
180 break;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
181 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
182 #endif
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
183 hold >>= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
184 bits -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
185 Tracevv((stderr, "inflate: distance %u\n", dist));
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
186 op = (unsigned)(out - beg); /* max distance in output */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
187 if (dist > op) { /* see if copy from window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
188 op = dist - op; /* distance back in window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
189 if (op > whave) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
190 strm->msg = (char *)"invalid distance too far back";
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
191 state->mode = BAD;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
192 break;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
193 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
194 from = window - OFF;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
195 if (write == 0) { /* very common case */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
196 from += wsize - op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
197 if (op < len) { /* some from window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
198 len -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
199 do {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
200 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
201 } while (--op);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
202 from = out - dist; /* rest from output */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
203 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
204 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
205 else if (write < op) { /* wrap around window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
206 from += wsize + write - op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
207 op -= write;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
208 if (op < len) { /* some from end of window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
209 len -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
210 do {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
211 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
212 } while (--op);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
213 from = window - OFF;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
214 if (write < len) { /* some from start of window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
215 op = write;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
216 len -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
217 do {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
218 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
219 } while (--op);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
220 from = out - dist; /* rest from output */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
221 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
222 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
223 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
224 else { /* contiguous in window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
225 from += write - op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
226 if (op < len) { /* some from window */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
227 len -= op;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
228 do {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
229 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
230 } while (--op);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
231 from = out - dist; /* rest from output */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
232 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
233 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
234 while (len > 2) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
235 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
236 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
237 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
238 len -= 3;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
239 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
240 if (len) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
241 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
242 if (len > 1)
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
243 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
244 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
245 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
246 else {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
247 from = out - dist; /* copy direct from output */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
248 do { /* minimum length is three */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
249 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
250 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
251 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
252 len -= 3;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
253 } while (len > 2);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
254 if (len) {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
255 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
256 if (len > 1)
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
257 PUP(out) = PUP(from);
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
258 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
259 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
260 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
261 else if ((op & 64) == 0) { /* 2nd level distance code */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
262 this = dcode[this.val + (hold & ((1U << op) - 1))];
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
263 goto dodist;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
264 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
265 else {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
266 strm->msg = (char *)"invalid distance code";
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
267 state->mode = BAD;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
268 break;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
269 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
270 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
271 else if ((op & 64) == 0) { /* 2nd level length code */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
272 this = lcode[this.val + (hold & ((1U << op) - 1))];
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
273 goto dolen;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
274 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
275 else if (op & 32) { /* end-of-block */
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
276 Tracevv((stderr, "inflate: end of block\n"));
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
277 state->mode = TYPE;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
278 break;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
279 }
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
280 else {
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
281 strm->msg = (char *)"invalid literal/length code";
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
282 state->mode = BAD;
81fa47d2d477 Import zlib into Python tree.
Martin v. Löwis <martin@v.loewis.de>
parents:
diff changeset
283 break;
81fa47d2d477 Import zlib into Python tree.
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284 }
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285 } while (in < last && out < end);
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286
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287 /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
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288 len = bits >> 3;
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289 in -= len;
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290 bits -= len << 3;
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291 hold &= (1U << bits) - 1;
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292
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293 /* update state and return */
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294 strm->next_in = in + OFF;
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295 strm->next_out = out + OFF;
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296 strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
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297 strm->avail_out = (unsigned)(out < end ?
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298 257 + (end - out) : 257 - (out - end));
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299 state->hold = hold;
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300 state->bits = bits;
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301 return;
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302 }
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303
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304 /*
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305 inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe):
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306 - Using bit fields for code structure
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307 - Different op definition to avoid & for extra bits (do & for table bits)
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308 - Three separate decoding do-loops for direct, window, and write == 0
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309 - Special case for distance > 1 copies to do overlapped load and store copy
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310 - Explicit branch predictions (based on measured branch probabilities)
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311 - Deferring match copy and interspersed it with decoding subsequent codes
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312 - Swapping literal/length else
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313 - Swapping window/direct else
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314 - Larger unrolled copy loops (three is about right)
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315 - Moving len -= 3 statement into middle of loop
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316 */
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317
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318 #endif /* !ASMINF */