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annotate src/dmzlib.c @ 951:1723ebe6771c

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