1 | /* infback9.c -- inflate deflate64 data using a call-back interface |
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2 | * Copyright (C) 1995-2003 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 "infback9.h" |
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8 | #include "inftree9.h" |
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9 | #include "inflate9.h" |
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10 | |
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11 | #define WSIZE 65536UL |
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12 | |
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13 | /* |
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14 | strm provides memory allocation functions in zalloc and zfree, or |
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15 | Z_NULL to use the library memory allocation functions. |
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16 | |
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17 | window is a user-supplied window and output buffer that is 64K bytes. |
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18 | */ |
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19 | int ZEXPORT inflateBack9Init_(strm, window, version, stream_size) |
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20 | z_stream FAR *strm; |
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21 | unsigned char FAR *window; |
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22 | const char *version; |
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23 | int stream_size; |
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24 | { |
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25 | struct inflate_state FAR *state; |
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26 | |
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27 | if (version == Z_NULL || version[0] != ZLIB_VERSION[0] || |
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28 | stream_size != (int)(sizeof(z_stream))) |
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29 | return Z_VERSION_ERROR; |
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30 | if (strm == Z_NULL || window == Z_NULL) |
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31 | return Z_STREAM_ERROR; |
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32 | strm->msg = Z_NULL; /* in case we return an error */ |
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33 | if (strm->zalloc == (alloc_func)0) { |
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34 | strm->zalloc = zcalloc; |
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35 | strm->opaque = (voidpf)0; |
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36 | } |
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37 | if (strm->zfree == (free_func)0) strm->zfree = zcfree; |
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38 | state = (struct inflate_state FAR *)ZALLOC(strm, 1, |
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39 | sizeof(struct inflate_state)); |
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40 | if (state == Z_NULL) return Z_MEM_ERROR; |
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41 | Tracev((stderr, "inflate: allocated\n")); |
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42 | strm->state = (voidpf)state; |
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43 | state->window = window; |
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44 | return Z_OK; |
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45 | } |
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46 | |
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47 | /* |
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48 | Build and output length and distance decoding tables for fixed code |
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49 | decoding. |
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50 | */ |
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51 | #ifdef MAKEFIXED |
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52 | #include <stdio.h> |
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53 | |
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54 | void makefixed9(void) |
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55 | { |
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56 | unsigned sym, bits, low, size; |
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57 | code *next, *lenfix, *distfix; |
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58 | struct inflate_state state; |
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59 | code fixed[544]; |
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60 | |
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61 | /* literal/length table */ |
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62 | sym = 0; |
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63 | while (sym < 144) state.lens[sym++] = 8; |
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64 | while (sym < 256) state.lens[sym++] = 9; |
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65 | while (sym < 280) state.lens[sym++] = 7; |
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66 | while (sym < 288) state.lens[sym++] = 8; |
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67 | next = fixed; |
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68 | lenfix = next; |
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69 | bits = 9; |
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70 | inflate_table9(LENS, state.lens, 288, &(next), &(bits), state.work); |
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71 | |
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72 | /* distance table */ |
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73 | sym = 0; |
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74 | while (sym < 32) state.lens[sym++] = 5; |
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75 | distfix = next; |
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76 | bits = 5; |
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77 | inflate_table9(DISTS, state.lens, 32, &(next), &(bits), state.work); |
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78 | |
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79 | /* write tables */ |
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80 | puts(" /* inffix9.h -- table for decoding deflate64 fixed codes"); |
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81 | puts(" * Generated automatically by makefixed9()."); |
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82 | puts(" */"); |
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83 | puts(""); |
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84 | puts(" /* WARNING: this file should *not* be used by applications."); |
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85 | puts(" It is part of the implementation of this library and is"); |
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86 | puts(" subject to change. Applications should only use zlib.h."); |
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87 | puts(" */"); |
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88 | puts(""); |
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89 | size = 1U << 9; |
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90 | printf(" static const code lenfix[%u] = {", size); |
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91 | low = 0; |
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92 | for (;;) { |
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93 | if ((low % 6) == 0) printf("\n "); |
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94 | printf("{%u,%u,%d}", lenfix[low].op, lenfix[low].bits, |
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95 | lenfix[low].val); |
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96 | if (++low == size) break; |
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97 | putchar(','); |
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98 | } |
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99 | puts("\n };"); |
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100 | size = 1U << 5; |
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101 | printf("\n static const code distfix[%u] = {", size); |
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102 | low = 0; |
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103 | for (;;) { |
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104 | if ((low % 5) == 0) printf("\n "); |
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105 | printf("{%u,%u,%d}", distfix[low].op, distfix[low].bits, |
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106 | distfix[low].val); |
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107 | if (++low == size) break; |
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108 | putchar(','); |
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109 | } |
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110 | puts("\n };"); |
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111 | } |
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112 | #endif /* MAKEFIXED */ |
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113 | |
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114 | /* Macros for inflateBack(): */ |
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115 | |
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116 | /* Clear the input bit accumulator */ |
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117 | #define INITBITS() \ |
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118 | do { \ |
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119 | hold = 0; \ |
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120 | bits = 0; \ |
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121 | } while (0) |
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122 | |
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123 | /* Assure that some input is available. If input is requested, but denied, |
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124 | then return a Z_BUF_ERROR from inflateBack(). */ |
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125 | #define PULL() \ |
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126 | do { \ |
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127 | if (have == 0) { \ |
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128 | have = in(in_desc, &next); \ |
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129 | if (have == 0) { \ |
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130 | next = Z_NULL; \ |
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131 | ret = Z_BUF_ERROR; \ |
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132 | goto inf_leave; \ |
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133 | } \ |
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134 | } \ |
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135 | } while (0) |
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136 | |
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137 | /* Get a byte of input into the bit accumulator, or return from inflateBack() |
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138 | with an error if there is no input available. */ |
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139 | #define PULLBYTE() \ |
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140 | do { \ |
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141 | PULL(); \ |
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142 | have--; \ |
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143 | hold += (unsigned long)(*next++) << bits; \ |
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144 | bits += 8; \ |
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145 | } while (0) |
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146 | |
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147 | /* Assure that there are at least n bits in the bit accumulator. If there is |
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148 | not enough available input to do that, then return from inflateBack() with |
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149 | an error. */ |
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150 | #define NEEDBITS(n) \ |
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151 | do { \ |
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152 | while (bits < (unsigned)(n)) \ |
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153 | PULLBYTE(); \ |
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154 | } while (0) |
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155 | |
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156 | /* Return the low n bits of the bit accumulator (n <= 16) */ |
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157 | #define BITS(n) \ |
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158 | ((unsigned)hold & ((1U << (n)) - 1)) |
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159 | |
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160 | /* Remove n bits from the bit accumulator */ |
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161 | #define DROPBITS(n) \ |
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162 | do { \ |
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163 | hold >>= (n); \ |
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164 | bits -= (unsigned)(n); \ |
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165 | } while (0) |
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166 | |
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167 | /* Remove zero to seven bits as needed to go to a byte boundary */ |
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168 | #define BYTEBITS() \ |
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169 | do { \ |
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170 | hold >>= bits & 7; \ |
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171 | bits -= bits & 7; \ |
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172 | } while (0) |
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173 | |
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174 | /* Assure that some output space is available, by writing out the window |
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175 | if it's full. If the write fails, return from inflateBack() with a |
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176 | Z_BUF_ERROR. */ |
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177 | #define ROOM() \ |
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178 | do { \ |
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179 | if (left == 0) { \ |
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180 | put = window; \ |
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181 | left = WSIZE; \ |
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182 | wrap = 1; \ |
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183 | if (out(out_desc, put, (unsigned)left)) { \ |
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184 | ret = Z_BUF_ERROR; \ |
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185 | goto inf_leave; \ |
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186 | } \ |
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187 | } \ |
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188 | } while (0) |
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189 | |
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190 | /* |
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191 | strm provides the memory allocation functions and window buffer on input, |
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192 | and provides information on the unused input on return. For Z_DATA_ERROR |
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193 | returns, strm will also provide an error message. |
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194 | |
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195 | in() and out() are the call-back input and output functions. When |
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196 | inflateBack() needs more input, it calls in(). When inflateBack() has |
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197 | filled the window with output, or when it completes with data in the |
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198 | window, it calls out() to write out the data. The application must not |
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199 | change the provided input until in() is called again or inflateBack() |
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200 | returns. The application must not change the window/output buffer until |
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201 | inflateBack() returns. |
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202 | |
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203 | in() and out() are called with a descriptor parameter provided in the |
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204 | inflateBack() call. This parameter can be a structure that provides the |
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205 | information required to do the read or write, as well as accumulated |
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206 | information on the input and output such as totals and check values. |
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207 | |
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208 | in() should return zero on failure. out() should return non-zero on |
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209 | failure. If either in() or out() fails, than inflateBack() returns a |
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210 | Z_BUF_ERROR. strm->next_in can be checked for Z_NULL to see whether it |
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211 | was in() or out() that caused in the error. Otherwise, inflateBack() |
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212 | returns Z_STREAM_END on success, Z_DATA_ERROR for an deflate format |
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213 | error, or Z_MEM_ERROR if it could not allocate memory for the state. |
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214 | inflateBack() can also return Z_STREAM_ERROR if the input parameters |
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215 | are not correct, i.e. strm is Z_NULL or the state was not initialized. |
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216 | */ |
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217 | int ZEXPORT inflateBack9(strm, in, in_desc, out, out_desc) |
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218 | z_stream FAR *strm; |
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219 | in_func in; |
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220 | void FAR *in_desc; |
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221 | out_func out; |
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222 | void FAR *out_desc; |
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223 | { |
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224 | struct inflate_state FAR *state; |
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225 | unsigned char FAR *next; /* next input */ |
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226 | unsigned char FAR *put; /* next output */ |
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227 | unsigned have; /* available input */ |
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228 | unsigned long left; /* available output */ |
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229 | inflate_mode mode; /* current inflate mode */ |
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230 | int lastblock; /* true if processing last block */ |
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231 | int wrap; /* true if the window has wrapped */ |
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232 | unsigned long write; /* window write index */ |
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233 | unsigned char FAR *window; /* allocated sliding window, if needed */ |
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234 | unsigned long hold; /* bit buffer */ |
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235 | unsigned bits; /* bits in bit buffer */ |
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236 | unsigned extra; /* extra bits needed */ |
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237 | unsigned long length; /* literal or length of data to copy */ |
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238 | unsigned long offset; /* distance back to copy string from */ |
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239 | unsigned long copy; /* number of stored or match bytes to copy */ |
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240 | unsigned char FAR *from; /* where to copy match bytes from */ |
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241 | code const FAR *lencode; /* starting table for length/literal codes */ |
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242 | code const FAR *distcode; /* starting table for distance codes */ |
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243 | unsigned lenbits; /* index bits for lencode */ |
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244 | unsigned distbits; /* index bits for distcode */ |
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245 | code this; /* current decoding table entry */ |
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246 | code last; /* parent table entry */ |
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247 | unsigned len; /* length to copy for repeats, bits to drop */ |
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248 | int ret; /* return code */ |
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249 | static const unsigned short order[19] = /* permutation of code lengths */ |
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250 | {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; |
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251 | #include "inffix9.h" |
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252 | |
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253 | /* Check that the strm exists and that the state was initialized */ |
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254 | if (strm == Z_NULL || strm->state == Z_NULL) |
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255 | return Z_STREAM_ERROR; |
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256 | state = (struct inflate_state FAR *)strm->state; |
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257 | |
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258 | /* Reset the state */ |
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259 | strm->msg = Z_NULL; |
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260 | mode = TYPE; |
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261 | lastblock = 0; |
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262 | write = 0; |
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263 | wrap = 0; |
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264 | window = state->window; |
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265 | next = strm->next_in; |
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266 | have = next != Z_NULL ? strm->avail_in : 0; |
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267 | hold = 0; |
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268 | bits = 0; |
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269 | put = window; |
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270 | left = WSIZE; |
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271 | lencode = Z_NULL; |
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272 | distcode = Z_NULL; |
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273 | |
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274 | /* Inflate until end of block marked as last */ |
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275 | for (;;) |
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276 | switch (mode) { |
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277 | case TYPE: |
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278 | /* determine and dispatch block type */ |
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279 | if (lastblock) { |
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280 | BYTEBITS(); |
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281 | mode = DONE; |
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282 | break; |
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283 | } |
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284 | NEEDBITS(3); |
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285 | lastblock = BITS(1); |
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286 | DROPBITS(1); |
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287 | switch (BITS(2)) { |
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288 | case 0: /* stored block */ |
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289 | Tracev((stderr, "inflate: stored block%s\n", |
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290 | lastblock ? " (last)" : "")); |
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291 | mode = STORED; |
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292 | break; |
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293 | case 1: /* fixed block */ |
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294 | lencode = lenfix; |
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295 | lenbits = 9; |
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296 | distcode = distfix; |
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297 | distbits = 5; |
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298 | Tracev((stderr, "inflate: fixed codes block%s\n", |
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299 | lastblock ? " (last)" : "")); |
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300 | mode = LEN; /* decode codes */ |
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301 | break; |
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302 | case 2: /* dynamic block */ |
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303 | Tracev((stderr, "inflate: dynamic codes block%s\n", |
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304 | lastblock ? " (last)" : "")); |
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305 | mode = TABLE; |
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306 | break; |
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307 | case 3: |
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308 | strm->msg = (char *)"invalid block type"; |
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309 | mode = BAD; |
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310 | } |
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311 | DROPBITS(2); |
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312 | break; |
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313 | |
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314 | case STORED: |
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315 | /* get and verify stored block length */ |
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316 | BYTEBITS(); /* go to byte boundary */ |
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317 | NEEDBITS(32); |
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318 | if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) { |
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319 | strm->msg = (char *)"invalid stored block lengths"; |
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320 | mode = BAD; |
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321 | break; |
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322 | } |
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323 | length = (unsigned)hold & 0xffff; |
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324 | Tracev((stderr, "inflate: stored length %lu\n", |
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325 | length)); |
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326 | INITBITS(); |
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327 | |
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328 | /* copy stored block from input to output */ |
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329 | while (length != 0) { |
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330 | copy = length; |
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331 | PULL(); |
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332 | ROOM(); |
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333 | if (copy > have) copy = have; |
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334 | if (copy > left) copy = left; |
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335 | zmemcpy(put, next, copy); |
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336 | have -= copy; |
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337 | next += copy; |
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338 | left -= copy; |
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339 | put += copy; |
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340 | length -= copy; |
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341 | } |
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342 | Tracev((stderr, "inflate: stored end\n")); |
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343 | mode = TYPE; |
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344 | break; |
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345 | |
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346 | case TABLE: |
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347 | /* get dynamic table entries descriptor */ |
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348 | NEEDBITS(14); |
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349 | state->nlen = BITS(5) + 257; |
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350 | DROPBITS(5); |
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351 | state->ndist = BITS(5) + 1; |
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352 | DROPBITS(5); |
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353 | state->ncode = BITS(4) + 4; |
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354 | DROPBITS(4); |
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355 | if (state->nlen > 286) { |
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356 | strm->msg = (char *)"too many length symbols"; |
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357 | mode = BAD; |
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358 | break; |
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359 | } |
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360 | Tracev((stderr, "inflate: table sizes ok\n")); |
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361 | |
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362 | /* get code length code lengths (not a typo) */ |
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363 | state->have = 0; |
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364 | while (state->have < state->ncode) { |
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365 | NEEDBITS(3); |
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366 | state->lens[order[state->have++]] = (unsigned short)BITS(3); |
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367 | DROPBITS(3); |
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368 | } |
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369 | while (state->have < 19) |
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370 | state->lens[order[state->have++]] = 0; |
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371 | state->next = state->codes; |
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372 | lencode = (code const FAR *)(state->next); |
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373 | lenbits = 7; |
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374 | ret = inflate_table9(CODES, state->lens, 19, &(state->next), |
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375 | &(lenbits), state->work); |
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376 | if (ret) { |
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377 | strm->msg = (char *)"invalid code lengths set"; |
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378 | mode = BAD; |
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379 | break; |
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380 | } |
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381 | Tracev((stderr, "inflate: code lengths ok\n")); |
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382 | |
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383 | /* get length and distance code code lengths */ |
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384 | state->have = 0; |
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385 | while (state->have < state->nlen + state->ndist) { |
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386 | for (;;) { |
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387 | this = lencode[BITS(lenbits)]; |
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388 | if ((unsigned)(this.bits) <= bits) break; |
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389 | PULLBYTE(); |
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390 | } |
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391 | if (this.val < 16) { |
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392 | NEEDBITS(this.bits); |
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393 | DROPBITS(this.bits); |
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394 | state->lens[state->have++] = this.val; |
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395 | } |
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396 | else { |
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397 | if (this.val == 16) { |
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398 | NEEDBITS(this.bits + 2); |
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399 | DROPBITS(this.bits); |
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400 | if (state->have == 0) { |
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401 | strm->msg = (char *)"invalid bit length repeat"; |
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402 | mode = BAD; |
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403 | break; |
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404 | } |
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405 | len = (unsigned)(state->lens[state->have - 1]); |
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406 | copy = 3 + BITS(2); |
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407 | DROPBITS(2); |
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408 | } |
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409 | else if (this.val == 17) { |
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410 | NEEDBITS(this.bits + 3); |
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411 | DROPBITS(this.bits); |
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412 | len = 0; |
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413 | copy = 3 + BITS(3); |
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414 | DROPBITS(3); |
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415 | } |
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416 | else { |
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417 | NEEDBITS(this.bits + 7); |
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418 | DROPBITS(this.bits); |
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419 | len = 0; |
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420 | copy = 11 + BITS(7); |
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421 | DROPBITS(7); |
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422 | } |
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423 | if (state->have + copy > state->nlen + state->ndist) { |
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424 | strm->msg = (char *)"invalid bit length repeat"; |
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425 | mode = BAD; |
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426 | break; |
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427 | } |
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428 | while (copy--) |
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429 | state->lens[state->have++] = (unsigned short)len; |
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430 | } |
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431 | } |
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432 | |
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433 | /* handle error breaks in while */ |
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434 | if (mode == BAD) break; |
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435 | |
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436 | /* build code tables */ |
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437 | state->next = state->codes; |
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438 | lencode = (code const FAR *)(state->next); |
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439 | lenbits = 9; |
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440 | ret = inflate_table9(LENS, state->lens, state->nlen, |
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441 | &(state->next), &(lenbits), state->work); |
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442 | if (ret) { |
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443 | strm->msg = (char *)"invalid literal/lengths set"; |
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444 | mode = BAD; |
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445 | break; |
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446 | } |
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447 | distcode = (code const FAR *)(state->next); |
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448 | distbits = 6; |
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449 | ret = inflate_table9(DISTS, state->lens + state->nlen, |
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450 | state->ndist, &(state->next), &(distbits), |
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451 | state->work); |
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452 | if (ret) { |
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453 | strm->msg = (char *)"invalid distances set"; |
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454 | mode = BAD; |
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455 | break; |
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456 | } |
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457 | Tracev((stderr, "inflate: codes ok\n")); |
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458 | mode = LEN; |
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459 | |
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460 | case LEN: |
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461 | /* get a literal, length, or end-of-block code */ |
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462 | for (;;) { |
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463 | this = lencode[BITS(lenbits)]; |
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464 | if ((unsigned)(this.bits) <= bits) break; |
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465 | PULLBYTE(); |
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466 | } |
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467 | if (this.op && (this.op & 0xf0) == 0) { |
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468 | last = this; |
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469 | for (;;) { |
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470 | this = lencode[last.val + |
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471 | (BITS(last.bits + last.op) >> last.bits)]; |
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472 | if ((unsigned)(last.bits + this.bits) <= bits) break; |
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473 | PULLBYTE(); |
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474 | } |
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475 | DROPBITS(last.bits); |
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476 | } |
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477 | DROPBITS(this.bits); |
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478 | length = (unsigned)this.val; |
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479 | |
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480 | /* process literal */ |
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481 | if (this.op == 0) { |
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482 | Tracevv((stderr, this.val >= 0x20 && this.val < 0x7f ? |
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483 | "inflate: literal '%c'\n" : |
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484 | "inflate: literal 0x%02x\n", this.val)); |
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485 | ROOM(); |
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486 | *put++ = (unsigned char)(length); |
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487 | left--; |
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488 | mode = LEN; |
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489 | break; |
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490 | } |
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491 | |
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492 | /* process end of block */ |
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493 | if (this.op & 32) { |
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494 | Tracevv((stderr, "inflate: end of block\n")); |
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495 | mode = TYPE; |
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496 | break; |
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497 | } |
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498 | |
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499 | /* invalid code */ |
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500 | if (this.op & 64) { |
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501 | strm->msg = (char *)"invalid literal/length code"; |
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502 | mode = BAD; |
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503 | break; |
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504 | } |
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505 | |
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506 | /* length code -- get extra bits, if any */ |
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507 | extra = (unsigned)(this.op) & 31; |
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508 | if (extra != 0) { |
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509 | NEEDBITS(extra); |
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510 | length += BITS(extra); |
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511 | DROPBITS(extra); |
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512 | } |
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513 | Tracevv((stderr, "inflate: length %lu\n", length)); |
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514 | |
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515 | /* get distance code */ |
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516 | for (;;) { |
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517 | this = distcode[BITS(distbits)]; |
---|
518 | if ((unsigned)(this.bits) <= bits) break; |
---|
519 | PULLBYTE(); |
---|
520 | } |
---|
521 | if ((this.op & 0xf0) == 0) { |
---|
522 | last = this; |
---|
523 | for (;;) { |
---|
524 | this = distcode[last.val + |
---|
525 | (BITS(last.bits + last.op) >> last.bits)]; |
---|
526 | if ((unsigned)(last.bits + this.bits) <= bits) break; |
---|
527 | PULLBYTE(); |
---|
528 | } |
---|
529 | DROPBITS(last.bits); |
---|
530 | } |
---|
531 | DROPBITS(this.bits); |
---|
532 | if (this.op & 64) { |
---|
533 | strm->msg = (char *)"invalid distance code"; |
---|
534 | mode = BAD; |
---|
535 | break; |
---|
536 | } |
---|
537 | offset = (unsigned)this.val; |
---|
538 | |
---|
539 | /* get distance extra bits, if any */ |
---|
540 | extra = (unsigned)(this.op) & 15; |
---|
541 | if (extra != 0) { |
---|
542 | NEEDBITS(extra); |
---|
543 | offset += BITS(extra); |
---|
544 | DROPBITS(extra); |
---|
545 | } |
---|
546 | if (offset > WSIZE - (wrap ? 0: left)) { |
---|
547 | strm->msg = (char *)"invalid distance too far back"; |
---|
548 | mode = BAD; |
---|
549 | break; |
---|
550 | } |
---|
551 | Tracevv((stderr, "inflate: distance %lu\n", offset)); |
---|
552 | |
---|
553 | /* copy match from window to output */ |
---|
554 | do { |
---|
555 | ROOM(); |
---|
556 | copy = WSIZE - offset; |
---|
557 | if (copy < left) { |
---|
558 | from = put + copy; |
---|
559 | copy = left - copy; |
---|
560 | } |
---|
561 | else { |
---|
562 | from = put - offset; |
---|
563 | copy = left; |
---|
564 | } |
---|
565 | if (copy > length) copy = length; |
---|
566 | length -= copy; |
---|
567 | left -= copy; |
---|
568 | do { |
---|
569 | *put++ = *from++; |
---|
570 | } while (--copy); |
---|
571 | } while (length != 0); |
---|
572 | break; |
---|
573 | |
---|
574 | case DONE: |
---|
575 | /* inflate stream terminated properly -- write leftover output */ |
---|
576 | ret = Z_STREAM_END; |
---|
577 | if (left < WSIZE) { |
---|
578 | if (out(out_desc, window, (unsigned)(WSIZE - left))) |
---|
579 | ret = Z_BUF_ERROR; |
---|
580 | } |
---|
581 | goto inf_leave; |
---|
582 | |
---|
583 | case BAD: |
---|
584 | ret = Z_DATA_ERROR; |
---|
585 | goto inf_leave; |
---|
586 | |
---|
587 | default: /* can't happen, but makes compilers happy */ |
---|
588 | ret = Z_STREAM_ERROR; |
---|
589 | goto inf_leave; |
---|
590 | } |
---|
591 | |
---|
592 | /* Return unused input */ |
---|
593 | inf_leave: |
---|
594 | strm->next_in = next; |
---|
595 | strm->avail_in = have; |
---|
596 | return ret; |
---|
597 | } |
---|
598 | |
---|
599 | int ZEXPORT inflateBack9End(strm) |
---|
600 | z_stream FAR *strm; |
---|
601 | { |
---|
602 | if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0) |
---|
603 | return Z_STREAM_ERROR; |
---|
604 | ZFREE(strm, strm->state); |
---|
605 | strm->state = Z_NULL; |
---|
606 | Tracev((stderr, "inflate: end\n")); |
---|
607 | return Z_OK; |
---|
608 | } |
---|