Mercurial > hg > dmlib
annotate src/dmzlib.c @ 955:6b2f41844580
Cosmetic cleanups.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Fri, 27 Feb 2015 01:03:18 +0200 |
parents | 88cbea0ee9b5 |
children | 985225a93aeb |
rev | line source |
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1 /* |
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2 * DMLib |
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3 * -- ZLib implementation |
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4 * Public domain zlib decode v0.2 by Sean Barrett 2006-11-18 |
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5 * Modified and reformatted for DMLib by Matti 'ccr' Hamalainen |
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6 */ |
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7 #include "dmzlib.h" |
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8 |
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9 |
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10 #define DM_ZLIB_TMPBUF_SIZE (16 * 1024) |
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11 #define STBI_ASSERT(x) // dummy |
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12 |
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13 |
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14 static int stbi__err(const char *s, const char *p) |
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15 { |
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16 (void) s; |
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17 (void) p; |
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18 return 0; |
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19 } |
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20 |
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21 |
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22 // @TODO: should statically initialize these for optimal thread safety |
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23 static Uint8 stbi__zdefault_length[288], stbi__zdefault_distance[32]; |
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24 |
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25 |
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26 void dmZLibInit() |
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27 { |
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28 int i; |
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29 |
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30 // use <= to match clearly with spec |
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31 for (i = 0; i <= 143; i++) |
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32 stbi__zdefault_length[i] = 8; |
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33 |
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34 for (; i <= 255; i++) |
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35 stbi__zdefault_length[i] = 9; |
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36 |
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37 for (; i <= 279; i++) |
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38 stbi__zdefault_length[i] = 7; |
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39 |
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40 for (; i <= 287; i++) |
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41 stbi__zdefault_length[i] = 8; |
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42 |
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43 for (i = 0; i <= 31; i++) |
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44 stbi__zdefault_distance[i] = 5; |
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45 } |
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46 |
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47 |
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48 static inline int stbi__bit_reverse_16(int n) |
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49 { |
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50 n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); |
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51 n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); |
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52 n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); |
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53 n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); |
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54 return n; |
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55 } |
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56 |
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57 |
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58 static inline int stbi__bit_reverse_n(int v, int bits) |
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59 { |
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60 STBI_ASSERT(bits <= 16); |
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61 // to bit reverse n bits, reverse 16 and shift |
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62 // e.g. 11 bits, bit reverse and shift away 5 |
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63 return stbi__bit_reverse_16(v) >> (16 - bits); |
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64 } |
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65 |
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66 |
954 | 67 static int stbi__zbuild_huffman(DMZHuffmanContext * z, const Uint8 * sizelist, const int num) |
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68 { |
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69 int i, k = 0; |
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70 int code, next_code[16], sizes[17]; |
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71 |
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72 // DEFLATE spec for generating codes |
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73 memset(sizes, 0, sizeof(sizes)); |
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74 memset(z->fast, 0, sizeof(z->fast)); |
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75 |
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76 for (i = 0; i < num; i++) |
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77 sizes[sizelist[i]]++; |
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78 |
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79 sizes[0] = 0; |
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80 for (i = 1; i < 16; i++) |
954 | 81 { |
82 if (sizes[i] > (1 << i)) | |
83 return stbi__err("fail!", "omg!"); | |
84 } | |
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85 |
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86 code = 0; |
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87 for (i = 1; i < 16; i++) |
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88 { |
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89 next_code[i] = code; |
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90 z->firstCode[i] = (Uint16) code; |
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91 z->firstSymbol[i] = (Uint16) k; |
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92 code = (code + sizes[i]); |
954 | 93 |
94 if (sizes[i] && code - 1 >= (1 << i)) | |
95 return stbi__err("bad codelengths", "Corrupt JPEG"); | |
96 | |
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97 z->maxCode[i] = code << (16 - i); // preshift for inner loop |
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98 code <<= 1; |
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99 k += sizes[i]; |
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100 } |
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101 |
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102 z->maxCode[16] = 0x10000; // sentinel |
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103 for (i = 0; i < num; i++) |
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104 { |
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105 int s = sizelist[i]; |
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106 if (s) |
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107 { |
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108 int c = next_code[s] - z->firstCode[s] + z->firstSymbol[s]; |
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109 Uint16 fastv = (Uint16) ((s << 9) | i); |
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110 z->size[c] = (Uint8) s; |
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111 z->value[c] = (Uint16) i; |
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112 if (s <= STBI__ZFAST_BITS) |
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113 { |
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114 int k = stbi__bit_reverse_n(next_code[s], s); |
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115 while (k < STBI__ZFAST_SIZE) |
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116 { |
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117 z->fast[k] = fastv; |
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118 k += (1 << s); |
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119 } |
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120 } |
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121 ++next_code[s]; |
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122 } |
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123 } |
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124 return 1; |
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125 } |
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126 |
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127 |
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128 static inline Uint8 stbi__zget8(DMZLibContext * z) |
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129 { |
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130 if (z->zbuffer >= z->zbuffer_end) |
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131 return 0; |
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132 |
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133 return *z->zbuffer++; |
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134 } |
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135 |
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136 |
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137 static void stbi__fill_bits(DMZLibContext * z) |
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138 { |
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139 do |
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140 { |
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141 STBI_ASSERT(z->code_buffer < (1U << z->num_bits)); |
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142 z->code_buffer |= stbi__zget8(z) << z->num_bits; |
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143 z->num_bits += 8; |
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144 } |
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145 while (z->num_bits <= 24); |
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146 } |
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147 |
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148 |
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149 static inline unsigned int stbi__zreceive(DMZLibContext * z, int n) |
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150 { |
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151 unsigned int k; |
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152 if (z->num_bits < n) |
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153 stbi__fill_bits(z); |
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154 k = z->code_buffer & ((1 << n) - 1); |
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155 z->code_buffer >>= n; |
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156 z->num_bits -= n; |
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157 return k; |
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158 } |
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159 |
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160 |
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161 static int stbi__zhuffman_decode_slowpath(DMZLibContext * a, DMZHuffmanContext * z) |
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162 { |
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163 int b, s, k; |
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164 |
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165 // not resolved by fast table, so compute it the slow way |
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166 // use jpeg approach, which requires MSbits at top |
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167 k = stbi__bit_reverse_16(a->code_buffer); |
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168 for (s = STBI__ZFAST_BITS + 1; ; s++) |
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169 { |
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170 if (k < z->maxCode[s]) break; |
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171 } |
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172 |
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173 if (s == 16) |
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174 return -1; // invalid code! |
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175 |
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176 // code size is s, so: |
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177 b = (k >> (16 - s)) - z->firstCode[s] + z->firstSymbol[s]; |
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178 STBI_ASSERT(z->size[b] == s); |
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179 a->code_buffer >>= s; |
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180 a->num_bits -= s; |
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181 return z->value[b]; |
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182 } |
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183 |
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184 |
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185 static inline int stbi__zhuffman_decode(DMZLibContext * a, DMZHuffmanContext * z) |
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186 { |
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187 int b; |
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188 if (a->num_bits < 16) |
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189 stbi__fill_bits(a); |
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190 |
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191 b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; |
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192 if (b) |
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193 { |
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194 int s = b >> 9; |
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195 a->code_buffer >>= s; |
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196 a->num_bits -= s; |
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197 return b & 511; |
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198 } |
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199 return stbi__zhuffman_decode_slowpath(a, z); |
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200 } |
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201 |
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202 |
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203 static int stbi__zexpand(DMZLibContext * z, char *zout, int n) // need to make room for n bytes |
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204 { |
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205 char *q; |
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206 int cur, limit; |
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207 z->zout = zout; |
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208 |
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209 if (!z->z_expandable) |
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210 return stbi__err("output buffer limit", "Corrupt PNG"); |
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211 |
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212 cur = (int) (z->zout - z->zout_start); |
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213 limit = (int) (z->zout_end - z->zout_start); |
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214 |
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215 while (cur + n > limit) |
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216 limit *= 2; |
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217 |
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218 if ((q = (char *) dmRealloc(z->zout_start, limit)) == NULL) |
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219 return stbi__err("outofmem", "Out of memory"); |
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220 |
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221 z->zout_start = q; |
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222 z->zout = q + cur; |
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223 z->zout_end = q + limit; |
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224 return 1; |
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225 } |
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226 |
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227 |
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228 static const int stbi__zlength_base[31] = |
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229 { |
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230 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, |
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231 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, |
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232 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 |
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233 }; |
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234 |
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235 static const int stbi__zlength_extra[31] = |
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236 { |
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237 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, |
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238 5, 5, 5, 5, 0, 0, 0 |
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239 }; |
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240 |
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241 static const int stbi__zdist_base[32] = |
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242 { |
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243 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, |
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244 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, |
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245 16385, 24577, 0, 0 |
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246 }; |
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247 |
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248 static const int stbi__zdist_extra[32] = |
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249 { |
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250 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, |
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251 10, 11, 11, 12, 12, 13, 13 |
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252 }; |
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253 |
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254 |
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255 static int stbi__parse_huffman_block(DMZLibContext * a) |
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256 { |
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257 char *zout = a->zout; |
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258 for (;;) |
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259 { |
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260 int z = stbi__zhuffman_decode(a, &a->z_length); |
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261 if (z < 256) |
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262 { |
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263 if (z < 0) |
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264 return stbi__err("bad huffman code", "Corrupt PNG"); // error in huffman codes |
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265 |
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266 if (zout >= a->zout_end) |
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267 { |
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268 if (!stbi__zexpand(a, zout, 1)) |
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269 return 0; |
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270 zout = a->zout; |
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271 } |
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272 *zout++ = (char) z; |
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273 } |
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274 else |
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275 { |
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276 Uint8 *p; |
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277 int len, dist; |
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278 if (z == 256) |
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279 { |
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280 a->zout = zout; |
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281 return 1; |
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282 } |
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283 z -= 257; |
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284 |
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285 len = stbi__zlength_base[z]; |
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286 if (stbi__zlength_extra[z]) |
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287 len += stbi__zreceive(a, stbi__zlength_extra[z]); |
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288 |
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289 z = stbi__zhuffman_decode(a, &a->z_distance); |
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290 if (z < 0) |
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291 return stbi__err("bad huffman code", "Corrupt PNG"); |
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292 |
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293 dist = stbi__zdist_base[z]; |
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294 if (stbi__zdist_extra[z]) |
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295 dist += stbi__zreceive(a, stbi__zdist_extra[z]); |
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296 |
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297 if (zout - a->zout_start < dist) |
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298 return stbi__err("bad dist", "Corrupt PNG"); |
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299 |
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300 if (zout + len > a->zout_end) |
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301 { |
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302 if (!stbi__zexpand(a, zout, len)) |
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303 return 0; |
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304 zout = a->zout; |
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305 } |
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306 p = (Uint8 *) (zout - dist); |
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307 if (dist == 1) |
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308 { // run of one byte; common in images. |
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309 Uint8 v = *p; |
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310 do { *zout++ = v; } while (--len); |
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311 } |
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312 else |
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313 { |
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314 do { *zout++ = *p++; } while (--len); |
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315 } |
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316 } |
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317 } |
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318 } |
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319 |
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320 |
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321 static const Uint8 length_dezigzag[19] = |
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322 { |
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323 16, 17, 18, 0, 8, 7, 9, |
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324 6 , 10, 5 , 11, 4, 12, 3, |
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325 13, 2 , 14, 1 , 15 |
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326 }; |
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327 |
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328 |
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329 static int stbi__compute_huffman_codes(DMZLibContext * a) |
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330 { |
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331 DMZHuffmanContext z_codelength; |
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332 Uint8 lencodes[286 + 32 + 137]; //padding for maximum single op |
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333 Uint8 codelength_sizes[19]; |
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334 int i, n; |
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335 |
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336 int hlit = stbi__zreceive(a, 5) + 257; |
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337 int hdist = stbi__zreceive(a, 5) + 1; |
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338 int hclen = stbi__zreceive(a, 4) + 4; |
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339 |
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340 memset(codelength_sizes, 0, sizeof(codelength_sizes)); |
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341 |
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342 for (i = 0; i < hclen; i++) |
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343 { |
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344 int s = stbi__zreceive(a, 3); |
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345 codelength_sizes[length_dezigzag[i]] = (Uint8) s; |
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346 } |
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347 if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) |
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348 return 0; |
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349 |
955 | 350 |
949
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351 n = 0; |
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352 while (n < hlit + hdist) |
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353 { |
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354 int c = stbi__zhuffman_decode(a, &z_codelength); |
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355 STBI_ASSERT(c >= 0 && c < 19); |
955 | 356 |
949
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357 if (c < 16) |
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358 lencodes[n++] = (Uint8) c; |
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359 else |
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360 if (c == 16) |
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361 { |
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362 c = stbi__zreceive(a, 2) + 3; |
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363 memset(lencodes + n, lencodes[n - 1], c); |
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364 n += c; |
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|
365 } |
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366 else |
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367 if (c == 17) |
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368 { |
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369 c = stbi__zreceive(a, 3) + 3; |
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370 memset(lencodes + n, 0, c); |
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371 n += c; |
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|
372 } |
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373 else |
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374 { |
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375 c = stbi__zreceive(a, 7) + 11; |
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376 memset(lencodes + n, 0, c); |
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377 n += c; |
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378 } |
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379 } |
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380 |
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381 if (n != hlit + hdist) |
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382 return stbi__err("bad codelengths", "Corrupt PNG"); |
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383 |
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384 if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) |
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385 return 0; |
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|
386 |
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387 if (!stbi__zbuild_huffman(&a->z_distance, lencodes + hlit, hdist)) |
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388 return 0; |
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389 return 1; |
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|
390 } |
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391 |
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392 |
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393 static int stbi__parse_uncompressed_block(DMZLibContext * a) |
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394 { |
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395 Uint8 header[4]; |
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396 int len, nlen, k; |
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parents:
diff
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|
397 |
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Initial import of separated zlib decoding routines lifted from
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|
398 if (a->num_bits & 7) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
399 stbi__zreceive(a, a->num_bits & 7); // discard |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
400 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
401 // drain the bit-packed data into header |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
402 k = 0; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
403 while (a->num_bits > 0) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
404 { |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
405 header[k++] = (Uint8) (a->code_buffer & 255); // suppress MSVC run-time check |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
406 a->code_buffer >>= 8; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
407 a->num_bits -= 8; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
408 } |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
409 STBI_ASSERT(a->num_bits == 0); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
410 |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
411 // now fill header the normal way |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
412 while (k < 4) |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
413 header[k++] = stbi__zget8(a); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
414 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
415 len = header[1] * 256 + header[0]; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
416 nlen = header[3] * 256 + header[2]; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
417 |
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Initial import of separated zlib decoding routines lifted from
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parents:
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|
418 if (nlen != (len ^ 0xffff)) |
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Initial import of separated zlib decoding routines lifted from
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419 return stbi__err("zlib corrupt", "Corrupt PNG"); |
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Initial import of separated zlib decoding routines lifted from
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parents:
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|
420 |
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Initial import of separated zlib decoding routines lifted from
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parents:
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|
421 if (a->zbuffer + len > a->zbuffer_end) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
422 return stbi__err("read past buffer", "Corrupt PNG"); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
423 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
424 if (a->zout + len > a->zout_end && !stbi__zexpand(a, a->zout, len)) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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425 return 0; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
426 |
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Initial import of separated zlib decoding routines lifted from
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parents:
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|
427 memcpy(a->zout, a->zbuffer, len); |
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Initial import of separated zlib decoding routines lifted from
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diff
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|
428 a->zbuffer += len; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
429 a->zout += len; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
430 return 1; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
431 } |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
432 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
433 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
434 static int stbi__parse_zlib_header(DMZLibContext * a) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
435 { |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
436 int cmf = stbi__zget8(a); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
437 int cm = cmf & 15; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
438 int flg = stbi__zget8(a); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
439 // int cinfo = cmf >> 4; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
440 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
441 if ((cmf * 256 + flg) % 31 != 0) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
442 return stbi__err("bad zlib header", "Corrupt PNG"); // zlib spec |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
443 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
444 if (flg & 32) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
445 return stbi__err("no preset dict", "Corrupt PNG"); // preset dictionary not allowed in png |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
446 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
447 if (cm != 8) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
448 return stbi__err("bad compression", "Corrupt PNG"); // DEFLATE required for png |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
449 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
450 // window = 1 << (8 + cinfo)... but who cares, we fully buffer output |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
451 return 1; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
452 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
453 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
454 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
455 static int stbi__parse_zlib(DMZLibContext * a, BOOL parse_header) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
456 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
457 int final, type; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
458 |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
459 if (parse_header && !stbi__parse_zlib_header(a)) |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
460 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
461 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
462 a->num_bits = 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
463 a->code_buffer = 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
464 do |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
465 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
466 final = stbi__zreceive(a, 1); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
467 type = stbi__zreceive(a, 2); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
468 if (type == 0) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
469 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
470 if (!stbi__parse_uncompressed_block(a)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
471 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
472 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
473 else |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
474 if (type == 3) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
475 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
476 else |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
477 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
478 if (type == 1) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
479 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
480 // use fixed code lengths |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
481 if (!stbi__zbuild_huffman(&a->z_length, stbi__zdefault_length, 288)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
482 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
483 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
484 if (!stbi__zbuild_huffman |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
485 (&a->z_distance, stbi__zdefault_distance, 32)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
486 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
487 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
488 else |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
489 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
490 if (!stbi__compute_huffman_codes(a)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
491 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
492 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
493 if (!stbi__parse_huffman_block(a)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
494 return 0; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
495 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
496 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
497 while (!final); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
498 return 1; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
499 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
500 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
501 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
502 static int stbi__do_zlib(DMZLibContext * a, char *obuf, int olen, int exp, |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
503 BOOL parse_header) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
504 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
505 a->zout_start = obuf; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
506 a->zout = obuf; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
507 a->zout_end = obuf + olen; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
508 a->z_expandable = exp; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
509 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
510 return stbi__parse_zlib(a, parse_header); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
511 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
512 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
513 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
514 char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
515 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
516 DMZLibContext a; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
517 char *p = (char *) dmMalloc(initial_size); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
518 if (p == NULL) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
519 return NULL; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
520 a.zbuffer = (Uint8 *) buffer; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
521 a.zbuffer_end = (Uint8 *) buffer + len; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
522 if (stbi__do_zlib(&a, p, initial_size, 1, 1)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
523 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
524 if (outlen) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
525 *outlen = (int) (a.zout - a.zout_start); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
526 return a.zout_start; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
527 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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528 else |
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Initial import of separated zlib decoding routines lifted from
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529 { |
6ed9465f3913
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530 dmFree(a.zout_start); |
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Initial import of separated zlib decoding routines lifted from
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531 return NULL; |
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Initial import of separated zlib decoding routines lifted from
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|
532 } |
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Initial import of separated zlib decoding routines lifted from
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533 } |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
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534 |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
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|
535 |
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|
536 char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
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537 { |
6ed9465f3913
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538 return stbi_zlib_decode_malloc_guesssize(buffer, len, DM_ZLIB_TMPBUF_SIZE, outlen); |
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Initial import of separated zlib decoding routines lifted from
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539 } |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
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540 |
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Initial import of separated zlib decoding routines lifted from
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541 |
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Matti Hamalainen <ccr@tnsp.org>
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542 char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, |
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543 int len, int initial_size, int *outlen, BOOL parse_header) |
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544 { |
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|
545 DMZLibContext a; |
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546 char *p = (char *) dmMalloc(initial_size); |
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547 if (p == NULL) |
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parents:
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|
548 return NULL; |
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|
549 |
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550 a.zbuffer = (Uint8 *) buffer; |
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diff
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|
551 a.zbuffer_end = (Uint8 *) buffer + len; |
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552 if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) |
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Initial import of separated zlib decoding routines lifted from
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|
553 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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554 if (outlen) |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
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555 *outlen = (int) (a.zout - a.zout_start); |
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diff
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556 return a.zout_start; |
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diff
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|
557 } |
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Initial import of separated zlib decoding routines lifted from
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diff
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|
558 else |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
559 { |
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Matti Hamalainen <ccr@tnsp.org>
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diff
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|
560 dmFree(a.zout_start); |
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561 return NULL; |
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parents:
diff
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|
562 } |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
563 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
564 |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
565 |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
566 int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
567 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
568 DMZLibContext a; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
569 a.zbuffer = (Uint8 *) ibuffer; |
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diff
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|
570 a.zbuffer_end = (Uint8 *) ibuffer + ilen; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
571 if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
572 return (int) (a.zout - a.zout_start); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
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|
573 else |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
574 return -1; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
575 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
576 |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
577 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
578 char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
579 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
580 DMZLibContext a; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
581 char *p = (char *) dmMalloc(DM_ZLIB_TMPBUF_SIZE); |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
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|
582 if (p == NULL) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
583 return NULL; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
584 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
585 a.zbuffer = (Uint8 *) buffer; |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
586 a.zbuffer_end = (Uint8 *) buffer + len; |
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Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
587 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
588 if (stbi__do_zlib(&a, p, DM_ZLIB_TMPBUF_SIZE, 1, 0)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
589 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
590 if (outlen != NULL) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
591 *outlen = (int) (a.zout - a.zout_start); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
592 return a.zout_start; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
593 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
594 else |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
595 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
596 dmFree(a.zout_start); |
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Initial import of separated zlib decoding routines lifted from
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parents:
diff
changeset
|
597 return NULL; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
598 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
599 } |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
600 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
601 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
602 int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
603 { |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
604 DMZLibContext a; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
605 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
606 a.zbuffer = (Uint8 *) ibuffer; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
607 a.zbuffer_end = (Uint8 *) ibuffer + ilen; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
608 |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
609 if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
610 return (int) (a.zout - a.zout_start); |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
611 else |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
612 return -1; |
6ed9465f3913
Initial import of separated zlib decoding routines lifted from
Matti Hamalainen <ccr@tnsp.org>
parents:
diff
changeset
|
613 } |