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Rev | Author | Line No. | Line |
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96 | giacomo | 1 | |
2 | /* pngread.c - read a PNG file |
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3 | * |
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4 | * libpng 1.2.5 - October 3, 2002 |
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5 | * For conditions of distribution and use, see copyright notice in png.h |
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6 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
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7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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9 | * |
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10 | * This file contains routines that an application calls directly to |
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11 | * read a PNG file or stream. |
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12 | */ |
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13 | |||
14 | #define PNG_INTERNAL |
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15 | #include "png.h" |
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16 | |||
17 | /* Create a PNG structure for reading, and allocate any memory needed. */ |
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18 | png_structp PNGAPI |
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19 | png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, |
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20 | png_error_ptr error_fn, png_error_ptr warn_fn) |
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21 | { |
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22 | |||
23 | #ifdef PNG_USER_MEM_SUPPORTED |
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24 | return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, |
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25 | warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); |
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26 | } |
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27 | |||
28 | /* Alternate create PNG structure for reading, and allocate any memory needed. */ |
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29 | png_structp PNGAPI |
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30 | png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, |
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31 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
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32 | png_malloc_ptr malloc_fn, png_free_ptr free_fn) |
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33 | { |
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34 | #endif /* PNG_USER_MEM_SUPPORTED */ |
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35 | |||
36 | png_structp png_ptr; |
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37 | |||
38 | #ifdef PNG_SETJMP_SUPPORTED |
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39 | #ifdef USE_FAR_KEYWORD |
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40 | jmp_buf jmpbuf; |
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41 | #endif |
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42 | #endif |
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43 | |||
44 | int i; |
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45 | |||
46 | png_debug(1, "in png_create_read_struct\n"); |
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47 | #ifdef PNG_USER_MEM_SUPPORTED |
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48 | png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, |
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49 | (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); |
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50 | #else |
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51 | png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
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52 | #endif |
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53 | if (png_ptr == NULL) |
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54 | return (NULL); |
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55 | |||
56 | #if !defined(PNG_1_0_X) |
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57 | #ifdef PNG_ASSEMBLER_CODE_SUPPORTED |
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58 | png_init_mmx_flags(png_ptr); /* 1.2.0 addition */ |
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59 | #endif |
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60 | #endif /* PNG_1_0_X */ |
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61 | |||
62 | #ifdef PNG_SETJMP_SUPPORTED |
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63 | #ifdef USE_FAR_KEYWORD |
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64 | if (setjmp(jmpbuf)) |
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65 | #else |
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66 | if (setjmp(png_ptr->jmpbuf)) |
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67 | #endif |
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68 | { |
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69 | png_free(png_ptr, png_ptr->zbuf); |
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70 | png_ptr->zbuf=NULL; |
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71 | #ifdef PNG_USER_MEM_SUPPORTED |
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72 | png_destroy_struct_2((png_voidp)png_ptr, |
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73 | (png_free_ptr)free_fn, (png_voidp)mem_ptr); |
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74 | #else |
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75 | png_destroy_struct((png_voidp)png_ptr); |
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76 | #endif |
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77 | return (NULL); |
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78 | } |
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79 | #ifdef USE_FAR_KEYWORD |
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80 | png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); |
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81 | #endif |
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82 | #endif |
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83 | |||
84 | #ifdef PNG_USER_MEM_SUPPORTED |
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85 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); |
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86 | #endif |
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87 | |||
88 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
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89 | |||
90 | i=0; |
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91 | do |
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92 | { |
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93 | if(user_png_ver[i] != png_libpng_ver[i]) |
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94 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
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95 | } while (png_libpng_ver[i++]); |
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96 | |||
97 | if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) |
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98 | { |
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99 | /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
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100 | * we must recompile any applications that use any older library version. |
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101 | * For versions after libpng 1.0, we will be compatible, so we need |
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102 | * only check the first digit. |
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103 | */ |
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104 | if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
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105 | (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || |
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106 | (user_png_ver[0] == '0' && user_png_ver[2] < '9')) |
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107 | { |
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108 | #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
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109 | char msg[80]; |
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110 | if (user_png_ver) |
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111 | { |
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112 | sprintf(msg, "Application was compiled with png.h from libpng-%.20s", |
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113 | user_png_ver); |
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114 | png_warning(png_ptr, msg); |
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115 | } |
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116 | sprintf(msg, "Application is running with png.c from libpng-%.20s", |
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117 | png_libpng_ver); |
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118 | png_warning(png_ptr, msg); |
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119 | #endif |
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120 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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121 | png_ptr->flags=0; |
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122 | #endif |
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123 | png_error(png_ptr, |
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124 | "Incompatible libpng version in application and library"); |
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125 | } |
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126 | } |
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127 | |||
128 | /* initialize zbuf - compression buffer */ |
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129 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
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130 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
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131 | (png_uint_32)png_ptr->zbuf_size); |
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132 | png_ptr->zstream.zalloc = png_zalloc; |
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133 | png_ptr->zstream.zfree = png_zfree; |
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134 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
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135 | |||
136 | switch (inflateInit(&png_ptr->zstream)) |
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137 | { |
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138 | case Z_OK: /* Do nothing */ break; |
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139 | case Z_MEM_ERROR: |
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140 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; |
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141 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; |
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142 | default: png_error(png_ptr, "Unknown zlib error"); |
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143 | } |
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144 | |||
145 | png_ptr->zstream.next_out = png_ptr->zbuf; |
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146 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
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147 | |||
148 | png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
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149 | |||
150 | #ifdef PNG_SETJMP_SUPPORTED |
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151 | /* Applications that neglect to set up their own setjmp() and then encounter |
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152 | a png_error() will longjmp here. Since the jmpbuf is then meaningless we |
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153 | abort instead of returning. */ |
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154 | #ifdef USE_FAR_KEYWORD |
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155 | if (setjmp(jmpbuf)) |
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156 | PNG_ABORT(); |
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157 | png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); |
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158 | #else |
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159 | if (setjmp(png_ptr->jmpbuf)) |
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160 | PNG_ABORT(); |
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161 | #endif |
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162 | #endif |
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163 | return (png_ptr); |
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164 | } |
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165 | |||
166 | /* Initialize PNG structure for reading, and allocate any memory needed. |
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167 | This interface is deprecated in favour of the png_create_read_struct(), |
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168 | and it will eventually disappear. */ |
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169 | #undef png_read_init |
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170 | void PNGAPI |
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171 | png_read_init(png_structp png_ptr) |
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172 | { |
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173 | /* We only come here via pre-1.0.7-compiled applications */ |
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174 | png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); |
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175 | } |
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176 | |||
177 | void PNGAPI |
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178 | png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, |
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179 | png_size_t png_struct_size, png_size_t png_info_size) |
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180 | { |
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181 | /* We only come here via pre-1.0.12-compiled applications */ |
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182 | #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
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183 | if(sizeof(png_struct) > png_struct_size || sizeof(png_info) > png_info_size) |
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184 | { |
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185 | char msg[80]; |
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186 | png_ptr->warning_fn=NULL; |
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187 | if (user_png_ver) |
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188 | { |
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189 | sprintf(msg, "Application was compiled with png.h from libpng-%.20s", |
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190 | user_png_ver); |
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191 | png_warning(png_ptr, msg); |
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192 | } |
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193 | sprintf(msg, "Application is running with png.c from libpng-%.20s", |
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194 | png_libpng_ver); |
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195 | png_warning(png_ptr, msg); |
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196 | } |
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197 | #endif |
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198 | if(sizeof(png_struct) > png_struct_size) |
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199 | { |
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200 | png_ptr->error_fn=NULL; |
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201 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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202 | png_ptr->flags=0; |
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203 | #endif |
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204 | png_error(png_ptr, |
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205 | "The png struct allocated by the application for reading is too small."); |
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206 | } |
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207 | if(sizeof(png_info) > png_info_size) |
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208 | { |
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209 | png_ptr->error_fn=NULL; |
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210 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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211 | png_ptr->flags=0; |
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212 | #endif |
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213 | png_error(png_ptr, |
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214 | "The info struct allocated by application for reading is too small."); |
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215 | } |
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216 | png_read_init_3(&png_ptr, user_png_ver, png_struct_size); |
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217 | } |
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218 | |||
219 | void PNGAPI |
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220 | png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, |
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221 | png_size_t png_struct_size) |
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222 | { |
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223 | #ifdef PNG_SETJMP_SUPPORTED |
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224 | jmp_buf tmp_jmp; /* to save current jump buffer */ |
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225 | #endif |
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226 | |||
227 | int i=0; |
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228 | |||
229 | png_structp png_ptr=*ptr_ptr; |
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230 | |||
231 | do |
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232 | { |
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233 | if(user_png_ver[i] != png_libpng_ver[i]) |
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234 | { |
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235 | #ifdef PNG_LEGACY_SUPPORTED |
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236 | png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
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237 | #else |
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238 | png_ptr->warning_fn=NULL; |
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239 | png_warning(png_ptr, |
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240 | "Application uses deprecated png_read_init() and should be recompiled."); |
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241 | break; |
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242 | #endif |
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243 | } |
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244 | } while (png_libpng_ver[i++]); |
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245 | |||
246 | png_debug(1, "in png_read_init_3\n"); |
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247 | |||
248 | #ifdef PNG_SETJMP_SUPPORTED |
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249 | /* save jump buffer and error functions */ |
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250 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
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251 | #endif |
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252 | |||
253 | if(sizeof(png_struct) > png_struct_size) |
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254 | { |
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255 | png_destroy_struct(png_ptr); |
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256 | *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
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257 | png_ptr = *ptr_ptr; |
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258 | } |
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259 | |||
260 | /* reset all variables to 0 */ |
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261 | png_memset(png_ptr, 0, sizeof (png_struct)); |
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262 | |||
263 | #ifdef PNG_SETJMP_SUPPORTED |
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264 | /* restore jump buffer */ |
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265 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
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266 | #endif |
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267 | |||
268 | /* initialize zbuf - compression buffer */ |
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269 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
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270 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
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271 | (png_uint_32)png_ptr->zbuf_size); |
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272 | png_ptr->zstream.zalloc = png_zalloc; |
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273 | png_ptr->zstream.zfree = png_zfree; |
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274 | png_ptr->zstream.opaque = (voidpf)png_ptr; |
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275 | |||
276 | switch (inflateInit(&png_ptr->zstream)) |
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277 | { |
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278 | case Z_OK: /* Do nothing */ break; |
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279 | case Z_MEM_ERROR: |
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280 | case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; |
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281 | case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; |
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282 | default: png_error(png_ptr, "Unknown zlib error"); |
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283 | } |
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284 | |||
285 | png_ptr->zstream.next_out = png_ptr->zbuf; |
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286 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
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287 | |||
288 | png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
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289 | } |
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290 | |||
291 | /* Read the information before the actual image data. This has been |
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292 | * changed in v0.90 to allow reading a file that already has the magic |
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293 | * bytes read from the stream. You can tell libpng how many bytes have |
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294 | * been read from the beginning of the stream (up to the maximum of 8) |
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295 | * via png_set_sig_bytes(), and we will only check the remaining bytes |
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296 | * here. The application can then have access to the signature bytes we |
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297 | * read if it is determined that this isn't a valid PNG file. |
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298 | */ |
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299 | void PNGAPI |
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300 | png_read_info(png_structp png_ptr, png_infop info_ptr) |
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301 | { |
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302 | png_debug(1, "in png_read_info\n"); |
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303 | /* If we haven't checked all of the PNG signature bytes, do so now. */ |
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304 | if (png_ptr->sig_bytes < 8) |
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305 | { |
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306 | png_size_t num_checked = png_ptr->sig_bytes, |
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307 | num_to_check = 8 - num_checked; |
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308 | |||
309 | png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); |
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310 | png_ptr->sig_bytes = 8; |
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311 | |||
312 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
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313 | { |
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314 | if (num_checked < 4 && |
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315 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
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316 | png_error(png_ptr, "Not a PNG file"); |
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317 | else |
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318 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
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319 | } |
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320 | if (num_checked < 3) |
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321 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
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322 | } |
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323 | |||
324 | for(;;) |
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325 | { |
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326 | #ifdef PNG_USE_LOCAL_ARRAYS |
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327 | PNG_IHDR; |
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328 | PNG_IDAT; |
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329 | PNG_IEND; |
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330 | PNG_PLTE; |
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331 | #if defined(PNG_READ_bKGD_SUPPORTED) |
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332 | PNG_bKGD; |
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333 | #endif |
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334 | #if defined(PNG_READ_cHRM_SUPPORTED) |
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335 | PNG_cHRM; |
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336 | #endif |
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337 | #if defined(PNG_READ_gAMA_SUPPORTED) |
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338 | PNG_gAMA; |
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339 | #endif |
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340 | #if defined(PNG_READ_hIST_SUPPORTED) |
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341 | PNG_hIST; |
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342 | #endif |
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343 | #if defined(PNG_READ_iCCP_SUPPORTED) |
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344 | PNG_iCCP; |
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345 | #endif |
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346 | #if defined(PNG_READ_iTXt_SUPPORTED) |
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347 | PNG_iTXt; |
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348 | #endif |
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349 | #if defined(PNG_READ_oFFs_SUPPORTED) |
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350 | PNG_oFFs; |
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351 | #endif |
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352 | #if defined(PNG_READ_pCAL_SUPPORTED) |
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353 | PNG_pCAL; |
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354 | #endif |
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355 | #if defined(PNG_READ_pHYs_SUPPORTED) |
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356 | PNG_pHYs; |
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357 | #endif |
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358 | #if defined(PNG_READ_sBIT_SUPPORTED) |
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359 | PNG_sBIT; |
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360 | #endif |
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361 | #if defined(PNG_READ_sCAL_SUPPORTED) |
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362 | PNG_sCAL; |
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363 | #endif |
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364 | #if defined(PNG_READ_sPLT_SUPPORTED) |
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365 | PNG_sPLT; |
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366 | #endif |
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367 | #if defined(PNG_READ_sRGB_SUPPORTED) |
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368 | PNG_sRGB; |
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369 | #endif |
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370 | #if defined(PNG_READ_tEXt_SUPPORTED) |
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371 | PNG_tEXt; |
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372 | #endif |
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373 | #if defined(PNG_READ_tIME_SUPPORTED) |
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374 | PNG_tIME; |
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375 | #endif |
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376 | #if defined(PNG_READ_tRNS_SUPPORTED) |
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377 | PNG_tRNS; |
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378 | #endif |
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379 | #if defined(PNG_READ_zTXt_SUPPORTED) |
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380 | PNG_zTXt; |
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381 | #endif |
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382 | #endif /* PNG_GLOBAL_ARRAYS */ |
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383 | png_byte chunk_length[4]; |
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384 | png_uint_32 length; |
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385 | |||
386 | png_read_data(png_ptr, chunk_length, 4); |
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387 | length = png_get_uint_32(chunk_length); |
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388 | |||
389 | png_reset_crc(png_ptr); |
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390 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
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391 | |||
392 | png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name, |
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393 | length); |
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394 | |||
395 | if (length > PNG_MAX_UINT) |
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396 | png_error(png_ptr, "Invalid chunk length."); |
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397 | |||
398 | /* This should be a binary subdivision search or a hash for |
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399 | * matching the chunk name rather than a linear search. |
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400 | */ |
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401 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
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402 | png_handle_IHDR(png_ptr, info_ptr, length); |
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403 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
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404 | png_handle_IEND(png_ptr, info_ptr, length); |
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405 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
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406 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
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407 | { |
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408 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
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409 | png_ptr->mode |= PNG_HAVE_IDAT; |
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410 | png_handle_unknown(png_ptr, info_ptr, length); |
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411 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
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412 | png_ptr->mode |= PNG_HAVE_PLTE; |
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413 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
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414 | { |
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415 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
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416 | png_error(png_ptr, "Missing IHDR before IDAT"); |
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417 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
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418 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
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419 | png_error(png_ptr, "Missing PLTE before IDAT"); |
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420 | break; |
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421 | } |
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422 | } |
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423 | #endif |
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424 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
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425 | png_handle_PLTE(png_ptr, info_ptr, length); |
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426 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
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427 | { |
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428 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
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429 | png_error(png_ptr, "Missing IHDR before IDAT"); |
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430 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
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431 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
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432 | png_error(png_ptr, "Missing PLTE before IDAT"); |
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433 | |||
434 | png_ptr->idat_size = length; |
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435 | png_ptr->mode |= PNG_HAVE_IDAT; |
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436 | break; |
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437 | } |
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438 | #if defined(PNG_READ_bKGD_SUPPORTED) |
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439 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
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440 | png_handle_bKGD(png_ptr, info_ptr, length); |
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441 | #endif |
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442 | #if defined(PNG_READ_cHRM_SUPPORTED) |
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443 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
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444 | png_handle_cHRM(png_ptr, info_ptr, length); |
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445 | #endif |
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446 | #if defined(PNG_READ_gAMA_SUPPORTED) |
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447 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
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448 | png_handle_gAMA(png_ptr, info_ptr, length); |
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449 | #endif |
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450 | #if defined(PNG_READ_hIST_SUPPORTED) |
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451 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
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452 | png_handle_hIST(png_ptr, info_ptr, length); |
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453 | #endif |
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454 | #if defined(PNG_READ_oFFs_SUPPORTED) |
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455 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
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456 | png_handle_oFFs(png_ptr, info_ptr, length); |
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457 | #endif |
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458 | #if defined(PNG_READ_pCAL_SUPPORTED) |
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459 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
||
460 | png_handle_pCAL(png_ptr, info_ptr, length); |
||
461 | #endif |
||
462 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
463 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
||
464 | png_handle_sCAL(png_ptr, info_ptr, length); |
||
465 | #endif |
||
466 | #if defined(PNG_READ_pHYs_SUPPORTED) |
||
467 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
||
468 | png_handle_pHYs(png_ptr, info_ptr, length); |
||
469 | #endif |
||
470 | #if defined(PNG_READ_sBIT_SUPPORTED) |
||
471 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
||
472 | png_handle_sBIT(png_ptr, info_ptr, length); |
||
473 | #endif |
||
474 | #if defined(PNG_READ_sRGB_SUPPORTED) |
||
475 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
||
476 | png_handle_sRGB(png_ptr, info_ptr, length); |
||
477 | #endif |
||
478 | #if defined(PNG_READ_iCCP_SUPPORTED) |
||
479 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
||
480 | png_handle_iCCP(png_ptr, info_ptr, length); |
||
481 | #endif |
||
482 | #if defined(PNG_READ_sPLT_SUPPORTED) |
||
483 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
||
484 | png_handle_sPLT(png_ptr, info_ptr, length); |
||
485 | #endif |
||
486 | #if defined(PNG_READ_tEXt_SUPPORTED) |
||
487 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
||
488 | png_handle_tEXt(png_ptr, info_ptr, length); |
||
489 | #endif |
||
490 | #if defined(PNG_READ_tIME_SUPPORTED) |
||
491 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
||
492 | png_handle_tIME(png_ptr, info_ptr, length); |
||
493 | #endif |
||
494 | #if defined(PNG_READ_tRNS_SUPPORTED) |
||
495 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
||
496 | png_handle_tRNS(png_ptr, info_ptr, length); |
||
497 | #endif |
||
498 | #if defined(PNG_READ_zTXt_SUPPORTED) |
||
499 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
||
500 | png_handle_zTXt(png_ptr, info_ptr, length); |
||
501 | #endif |
||
502 | #if defined(PNG_READ_iTXt_SUPPORTED) |
||
503 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
||
504 | png_handle_iTXt(png_ptr, info_ptr, length); |
||
505 | #endif |
||
506 | else |
||
507 | png_handle_unknown(png_ptr, info_ptr, length); |
||
508 | } |
||
509 | } |
||
510 | |||
511 | /* optional call to update the users info_ptr structure */ |
||
512 | void PNGAPI |
||
513 | png_read_update_info(png_structp png_ptr, png_infop info_ptr) |
||
514 | { |
||
515 | png_debug(1, "in png_read_update_info\n"); |
||
516 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
||
517 | png_read_start_row(png_ptr); |
||
518 | else |
||
519 | png_warning(png_ptr, |
||
520 | "Ignoring extra png_read_update_info() call; row buffer not reallocated"); |
||
521 | png_read_transform_info(png_ptr, info_ptr); |
||
522 | } |
||
523 | |||
524 | /* Initialize palette, background, etc, after transformations |
||
525 | * are set, but before any reading takes place. This allows |
||
526 | * the user to obtain a gamma-corrected palette, for example. |
||
527 | * If the user doesn't call this, we will do it ourselves. |
||
528 | */ |
||
529 | void PNGAPI |
||
530 | png_start_read_image(png_structp png_ptr) |
||
531 | { |
||
532 | png_debug(1, "in png_start_read_image\n"); |
||
533 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
||
534 | png_read_start_row(png_ptr); |
||
535 | } |
||
536 | |||
537 | void PNGAPI |
||
538 | png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) |
||
539 | { |
||
540 | #ifdef PNG_USE_LOCAL_ARRAYS |
||
541 | PNG_IDAT; |
||
542 | const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
||
543 | const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
||
544 | #endif |
||
545 | int ret; |
||
546 | png_debug2(1, "in png_read_row (row %lu, pass %d)\n", |
||
547 | png_ptr->row_number, png_ptr->pass); |
||
548 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
||
549 | png_read_start_row(png_ptr); |
||
550 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
||
551 | { |
||
552 | /* check for transforms that have been set but were defined out */ |
||
553 | #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) |
||
554 | if (png_ptr->transformations & PNG_INVERT_MONO) |
||
555 | png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined."); |
||
556 | #endif |
||
557 | #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) |
||
558 | if (png_ptr->transformations & PNG_FILLER) |
||
559 | png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined."); |
||
560 | #endif |
||
561 | #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED) |
||
562 | if (png_ptr->transformations & PNG_PACKSWAP) |
||
563 | png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined."); |
||
564 | #endif |
||
565 | #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) |
||
566 | if (png_ptr->transformations & PNG_PACK) |
||
567 | png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined."); |
||
568 | #endif |
||
569 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) |
||
570 | if (png_ptr->transformations & PNG_SHIFT) |
||
571 | png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined."); |
||
572 | #endif |
||
573 | #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) |
||
574 | if (png_ptr->transformations & PNG_BGR) |
||
575 | png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined."); |
||
576 | #endif |
||
577 | #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) |
||
578 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
||
579 | png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined."); |
||
580 | #endif |
||
581 | } |
||
582 | |||
583 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
||
584 | /* if interlaced and we do not need a new row, combine row and return */ |
||
585 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
||
586 | { |
||
587 | switch (png_ptr->pass) |
||
588 | { |
||
589 | case 0: |
||
590 | if (png_ptr->row_number & 0x07) |
||
591 | { |
||
592 | if (dsp_row != NULL) |
||
593 | png_combine_row(png_ptr, dsp_row, |
||
594 | png_pass_dsp_mask[png_ptr->pass]); |
||
595 | png_read_finish_row(png_ptr); |
||
596 | return; |
||
597 | } |
||
598 | break; |
||
599 | case 1: |
||
600 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
||
601 | { |
||
602 | if (dsp_row != NULL) |
||
603 | png_combine_row(png_ptr, dsp_row, |
||
604 | png_pass_dsp_mask[png_ptr->pass]); |
||
605 | png_read_finish_row(png_ptr); |
||
606 | return; |
||
607 | } |
||
608 | break; |
||
609 | case 2: |
||
610 | if ((png_ptr->row_number & 0x07) != 4) |
||
611 | { |
||
612 | if (dsp_row != NULL && (png_ptr->row_number & 4)) |
||
613 | png_combine_row(png_ptr, dsp_row, |
||
614 | png_pass_dsp_mask[png_ptr->pass]); |
||
615 | png_read_finish_row(png_ptr); |
||
616 | return; |
||
617 | } |
||
618 | break; |
||
619 | case 3: |
||
620 | if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
||
621 | { |
||
622 | if (dsp_row != NULL) |
||
623 | png_combine_row(png_ptr, dsp_row, |
||
624 | png_pass_dsp_mask[png_ptr->pass]); |
||
625 | png_read_finish_row(png_ptr); |
||
626 | return; |
||
627 | } |
||
628 | break; |
||
629 | case 4: |
||
630 | if ((png_ptr->row_number & 3) != 2) |
||
631 | { |
||
632 | if (dsp_row != NULL && (png_ptr->row_number & 2)) |
||
633 | png_combine_row(png_ptr, dsp_row, |
||
634 | png_pass_dsp_mask[png_ptr->pass]); |
||
635 | png_read_finish_row(png_ptr); |
||
636 | return; |
||
637 | } |
||
638 | break; |
||
639 | case 5: |
||
640 | if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
||
641 | { |
||
642 | if (dsp_row != NULL) |
||
643 | png_combine_row(png_ptr, dsp_row, |
||
644 | png_pass_dsp_mask[png_ptr->pass]); |
||
645 | png_read_finish_row(png_ptr); |
||
646 | return; |
||
647 | } |
||
648 | break; |
||
649 | case 6: |
||
650 | if (!(png_ptr->row_number & 1)) |
||
651 | { |
||
652 | png_read_finish_row(png_ptr); |
||
653 | return; |
||
654 | } |
||
655 | break; |
||
656 | } |
||
657 | } |
||
658 | #endif |
||
659 | |||
660 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
||
661 | png_error(png_ptr, "Invalid attempt to read row data"); |
||
662 | |||
663 | png_ptr->zstream.next_out = png_ptr->row_buf; |
||
664 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
||
665 | do |
||
666 | { |
||
667 | if (!(png_ptr->zstream.avail_in)) |
||
668 | { |
||
669 | while (!png_ptr->idat_size) |
||
670 | { |
||
671 | png_byte chunk_length[4]; |
||
672 | |||
673 | png_crc_finish(png_ptr, 0); |
||
674 | |||
675 | png_read_data(png_ptr, chunk_length, 4); |
||
676 | png_ptr->idat_size = png_get_uint_32(chunk_length); |
||
677 | |||
678 | if (png_ptr->idat_size > PNG_MAX_UINT) |
||
679 | png_error(png_ptr, "Invalid chunk length."); |
||
680 | |||
681 | png_reset_crc(png_ptr); |
||
682 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
||
683 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
||
684 | png_error(png_ptr, "Not enough image data"); |
||
685 | } |
||
686 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
||
687 | png_ptr->zstream.next_in = png_ptr->zbuf; |
||
688 | if (png_ptr->zbuf_size > png_ptr->idat_size) |
||
689 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
||
690 | png_crc_read(png_ptr, png_ptr->zbuf, |
||
691 | (png_size_t)png_ptr->zstream.avail_in); |
||
692 | png_ptr->idat_size -= png_ptr->zstream.avail_in; |
||
693 | } |
||
694 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
||
695 | if (ret == Z_STREAM_END) |
||
696 | { |
||
697 | if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || |
||
698 | png_ptr->idat_size) |
||
699 | png_error(png_ptr, "Extra compressed data"); |
||
700 | png_ptr->mode |= PNG_AFTER_IDAT; |
||
701 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
||
702 | break; |
||
703 | } |
||
704 | if (ret != Z_OK) |
||
705 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
||
706 | "Decompression error"); |
||
707 | |||
708 | } while (png_ptr->zstream.avail_out); |
||
709 | |||
710 | png_ptr->row_info.color_type = png_ptr->color_type; |
||
711 | png_ptr->row_info.width = png_ptr->iwidth; |
||
712 | png_ptr->row_info.channels = png_ptr->channels; |
||
713 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
||
714 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
||
715 | png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * |
||
716 | (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); |
||
717 | |||
718 | if(png_ptr->row_buf[0]) |
||
719 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
||
720 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
||
721 | (int)(png_ptr->row_buf[0])); |
||
722 | |||
723 | png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
||
724 | png_ptr->rowbytes + 1); |
||
725 | |||
726 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
||
727 | if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
||
728 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
||
729 | { |
||
730 | /* Intrapixel differencing */ |
||
731 | png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); |
||
732 | } |
||
733 | #endif |
||
734 | |||
735 | if (png_ptr->transformations) |
||
736 | png_do_read_transformations(png_ptr); |
||
737 | |||
738 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
||
739 | /* blow up interlaced rows to full size */ |
||
740 | if (png_ptr->interlaced && |
||
741 | (png_ptr->transformations & PNG_INTERLACE)) |
||
742 | { |
||
743 | if (png_ptr->pass < 6) |
||
744 | /* old interface (pre-1.0.9): |
||
745 | png_do_read_interlace(&(png_ptr->row_info), |
||
746 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
||
747 | */ |
||
748 | png_do_read_interlace(png_ptr); |
||
749 | |||
750 | if (dsp_row != NULL) |
||
751 | png_combine_row(png_ptr, dsp_row, |
||
752 | png_pass_dsp_mask[png_ptr->pass]); |
||
753 | if (row != NULL) |
||
754 | png_combine_row(png_ptr, row, |
||
755 | png_pass_mask[png_ptr->pass]); |
||
756 | } |
||
757 | else |
||
758 | #endif |
||
759 | { |
||
760 | if (row != NULL) |
||
761 | png_combine_row(png_ptr, row, 0xff); |
||
762 | if (dsp_row != NULL) |
||
763 | png_combine_row(png_ptr, dsp_row, 0xff); |
||
764 | } |
||
765 | png_read_finish_row(png_ptr); |
||
766 | |||
767 | if (png_ptr->read_row_fn != NULL) |
||
768 | (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
||
769 | } |
||
770 | |||
771 | /* Read one or more rows of image data. If the image is interlaced, |
||
772 | * and png_set_interlace_handling() has been called, the rows need to |
||
773 | * contain the contents of the rows from the previous pass. If the |
||
774 | * image has alpha or transparency, and png_handle_alpha()[*] has been |
||
775 | * called, the rows contents must be initialized to the contents of the |
||
776 | * screen. |
||
777 | * |
||
778 | * "row" holds the actual image, and pixels are placed in it |
||
779 | * as they arrive. If the image is displayed after each pass, it will |
||
780 | * appear to "sparkle" in. "display_row" can be used to display a |
||
781 | * "chunky" progressive image, with finer detail added as it becomes |
||
782 | * available. If you do not want this "chunky" display, you may pass |
||
783 | * NULL for display_row. If you do not want the sparkle display, and |
||
784 | * you have not called png_handle_alpha(), you may pass NULL for rows. |
||
785 | * If you have called png_handle_alpha(), and the image has either an |
||
786 | * alpha channel or a transparency chunk, you must provide a buffer for |
||
787 | * rows. In this case, you do not have to provide a display_row buffer |
||
788 | * also, but you may. If the image is not interlaced, or if you have |
||
789 | * not called png_set_interlace_handling(), the display_row buffer will |
||
790 | * be ignored, so pass NULL to it. |
||
791 | * |
||
792 | * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.5 |
||
793 | */ |
||
794 | |||
795 | void PNGAPI |
||
796 | png_read_rows(png_structp png_ptr, png_bytepp row, |
||
797 | png_bytepp display_row, png_uint_32 num_rows) |
||
798 | { |
||
799 | png_uint_32 i; |
||
800 | png_bytepp rp; |
||
801 | png_bytepp dp; |
||
802 | |||
803 | png_debug(1, "in png_read_rows\n"); |
||
804 | rp = row; |
||
805 | dp = display_row; |
||
806 | if (rp != NULL && dp != NULL) |
||
807 | for (i = 0; i < num_rows; i++) |
||
808 | { |
||
809 | png_bytep rptr = *rp++; |
||
810 | png_bytep dptr = *dp++; |
||
811 | |||
812 | png_read_row(png_ptr, rptr, dptr); |
||
813 | } |
||
814 | else if(rp != NULL) |
||
815 | for (i = 0; i < num_rows; i++) |
||
816 | { |
||
817 | png_bytep rptr = *rp; |
||
818 | png_read_row(png_ptr, rptr, png_bytep_NULL); |
||
819 | rp++; |
||
820 | } |
||
821 | else if(dp != NULL) |
||
822 | for (i = 0; i < num_rows; i++) |
||
823 | { |
||
824 | png_bytep dptr = *dp; |
||
825 | png_read_row(png_ptr, png_bytep_NULL, dptr); |
||
826 | dp++; |
||
827 | } |
||
828 | } |
||
829 | |||
830 | /* Read the entire image. If the image has an alpha channel or a tRNS |
||
831 | * chunk, and you have called png_handle_alpha()[*], you will need to |
||
832 | * initialize the image to the current image that PNG will be overlaying. |
||
833 | * We set the num_rows again here, in case it was incorrectly set in |
||
834 | * png_read_start_row() by a call to png_read_update_info() or |
||
835 | * png_start_read_image() if png_set_interlace_handling() wasn't called |
||
836 | * prior to either of these functions like it should have been. You can |
||
837 | * only call this function once. If you desire to have an image for |
||
838 | * each pass of a interlaced image, use png_read_rows() instead. |
||
839 | * |
||
840 | * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.5 |
||
841 | */ |
||
842 | void PNGAPI |
||
843 | png_read_image(png_structp png_ptr, png_bytepp image) |
||
844 | { |
||
845 | png_uint_32 i,image_height; |
||
846 | int pass, j; |
||
847 | png_bytepp rp; |
||
848 | |||
849 | png_debug(1, "in png_read_image\n"); |
||
850 | |||
851 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
||
852 | pass = png_set_interlace_handling(png_ptr); |
||
853 | #else |
||
854 | if (png_ptr->interlaced) |
||
855 | png_error(png_ptr, |
||
856 | "Cannot read interlaced image -- interlace handler disabled."); |
||
857 | pass = 1; |
||
858 | #endif |
||
859 | |||
860 | |||
861 | image_height=png_ptr->height; |
||
862 | png_ptr->num_rows = image_height; /* Make sure this is set correctly */ |
||
863 | |||
864 | for (j = 0; j < pass; j++) |
||
865 | { |
||
866 | rp = image; |
||
867 | for (i = 0; i < image_height; i++) |
||
868 | { |
||
869 | png_read_row(png_ptr, *rp, png_bytep_NULL); |
||
870 | rp++; |
||
871 | } |
||
872 | } |
||
873 | } |
||
874 | |||
875 | /* Read the end of the PNG file. Will not read past the end of the |
||
876 | * file, will verify the end is accurate, and will read any comments |
||
877 | * or time information at the end of the file, if info is not NULL. |
||
878 | */ |
||
879 | void PNGAPI |
||
880 | png_read_end(png_structp png_ptr, png_infop info_ptr) |
||
881 | { |
||
882 | png_byte chunk_length[4]; |
||
883 | png_uint_32 length; |
||
884 | |||
885 | png_debug(1, "in png_read_end\n"); |
||
886 | png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ |
||
887 | |||
888 | do |
||
889 | { |
||
890 | #ifdef PNG_USE_LOCAL_ARRAYS |
||
891 | PNG_IHDR; |
||
892 | PNG_IDAT; |
||
893 | PNG_IEND; |
||
894 | PNG_PLTE; |
||
895 | #if defined(PNG_READ_bKGD_SUPPORTED) |
||
896 | PNG_bKGD; |
||
897 | #endif |
||
898 | #if defined(PNG_READ_cHRM_SUPPORTED) |
||
899 | PNG_cHRM; |
||
900 | #endif |
||
901 | #if defined(PNG_READ_gAMA_SUPPORTED) |
||
902 | PNG_gAMA; |
||
903 | #endif |
||
904 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
905 | PNG_hIST; |
||
906 | #endif |
||
907 | #if defined(PNG_READ_iCCP_SUPPORTED) |
||
908 | PNG_iCCP; |
||
909 | #endif |
||
910 | #if defined(PNG_READ_iTXt_SUPPORTED) |
||
911 | PNG_iTXt; |
||
912 | #endif |
||
913 | #if defined(PNG_READ_oFFs_SUPPORTED) |
||
914 | PNG_oFFs; |
||
915 | #endif |
||
916 | #if defined(PNG_READ_pCAL_SUPPORTED) |
||
917 | PNG_pCAL; |
||
918 | #endif |
||
919 | #if defined(PNG_READ_pHYs_SUPPORTED) |
||
920 | PNG_pHYs; |
||
921 | #endif |
||
922 | #if defined(PNG_READ_sBIT_SUPPORTED) |
||
923 | PNG_sBIT; |
||
924 | #endif |
||
925 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
926 | PNG_sCAL; |
||
927 | #endif |
||
928 | #if defined(PNG_READ_sPLT_SUPPORTED) |
||
929 | PNG_sPLT; |
||
930 | #endif |
||
931 | #if defined(PNG_READ_sRGB_SUPPORTED) |
||
932 | PNG_sRGB; |
||
933 | #endif |
||
934 | #if defined(PNG_READ_tEXt_SUPPORTED) |
||
935 | PNG_tEXt; |
||
936 | #endif |
||
937 | #if defined(PNG_READ_tIME_SUPPORTED) |
||
938 | PNG_tIME; |
||
939 | #endif |
||
940 | #if defined(PNG_READ_tRNS_SUPPORTED) |
||
941 | PNG_tRNS; |
||
942 | #endif |
||
943 | #if defined(PNG_READ_zTXt_SUPPORTED) |
||
944 | PNG_zTXt; |
||
945 | #endif |
||
946 | #endif /* PNG_GLOBAL_ARRAYS */ |
||
947 | |||
948 | png_read_data(png_ptr, chunk_length, 4); |
||
949 | length = png_get_uint_32(chunk_length); |
||
950 | |||
951 | png_reset_crc(png_ptr); |
||
952 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
||
953 | |||
954 | png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name); |
||
955 | |||
956 | if (length > PNG_MAX_UINT) |
||
957 | png_error(png_ptr, "Invalid chunk length."); |
||
958 | |||
959 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
||
960 | png_handle_IHDR(png_ptr, info_ptr, length); |
||
961 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
||
962 | png_handle_IEND(png_ptr, info_ptr, length); |
||
963 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
||
964 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
||
965 | { |
||
966 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
||
967 | { |
||
968 | if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) |
||
969 | png_error(png_ptr, "Too many IDAT's found"); |
||
970 | } |
||
971 | else |
||
972 | png_ptr->mode |= PNG_AFTER_IDAT; |
||
973 | png_handle_unknown(png_ptr, info_ptr, length); |
||
974 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
||
975 | png_ptr->mode |= PNG_HAVE_PLTE; |
||
976 | } |
||
977 | #endif |
||
978 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
||
979 | { |
||
980 | /* Zero length IDATs are legal after the last IDAT has been |
||
981 | * read, but not after other chunks have been read. |
||
982 | */ |
||
983 | if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT) |
||
984 | png_error(png_ptr, "Too many IDAT's found"); |
||
985 | png_crc_finish(png_ptr, length); |
||
986 | } |
||
987 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
||
988 | png_handle_PLTE(png_ptr, info_ptr, length); |
||
989 | #if defined(PNG_READ_bKGD_SUPPORTED) |
||
990 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
||
991 | png_handle_bKGD(png_ptr, info_ptr, length); |
||
992 | #endif |
||
993 | #if defined(PNG_READ_cHRM_SUPPORTED) |
||
994 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
||
995 | png_handle_cHRM(png_ptr, info_ptr, length); |
||
996 | #endif |
||
997 | #if defined(PNG_READ_gAMA_SUPPORTED) |
||
998 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
||
999 | png_handle_gAMA(png_ptr, info_ptr, length); |
||
1000 | #endif |
||
1001 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
1002 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
||
1003 | png_handle_hIST(png_ptr, info_ptr, length); |
||
1004 | #endif |
||
1005 | #if defined(PNG_READ_oFFs_SUPPORTED) |
||
1006 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
||
1007 | png_handle_oFFs(png_ptr, info_ptr, length); |
||
1008 | #endif |
||
1009 | #if defined(PNG_READ_pCAL_SUPPORTED) |
||
1010 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
||
1011 | png_handle_pCAL(png_ptr, info_ptr, length); |
||
1012 | #endif |
||
1013 | #if defined(PNG_READ_sCAL_SUPPORTED) |
||
1014 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
||
1015 | png_handle_sCAL(png_ptr, info_ptr, length); |
||
1016 | #endif |
||
1017 | #if defined(PNG_READ_pHYs_SUPPORTED) |
||
1018 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
||
1019 | png_handle_pHYs(png_ptr, info_ptr, length); |
||
1020 | #endif |
||
1021 | #if defined(PNG_READ_sBIT_SUPPORTED) |
||
1022 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
||
1023 | png_handle_sBIT(png_ptr, info_ptr, length); |
||
1024 | #endif |
||
1025 | #if defined(PNG_READ_sRGB_SUPPORTED) |
||
1026 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
||
1027 | png_handle_sRGB(png_ptr, info_ptr, length); |
||
1028 | #endif |
||
1029 | #if defined(PNG_READ_iCCP_SUPPORTED) |
||
1030 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
||
1031 | png_handle_iCCP(png_ptr, info_ptr, length); |
||
1032 | #endif |
||
1033 | #if defined(PNG_READ_sPLT_SUPPORTED) |
||
1034 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
||
1035 | png_handle_sPLT(png_ptr, info_ptr, length); |
||
1036 | #endif |
||
1037 | #if defined(PNG_READ_tEXt_SUPPORTED) |
||
1038 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
||
1039 | png_handle_tEXt(png_ptr, info_ptr, length); |
||
1040 | #endif |
||
1041 | #if defined(PNG_READ_tIME_SUPPORTED) |
||
1042 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
||
1043 | png_handle_tIME(png_ptr, info_ptr, length); |
||
1044 | #endif |
||
1045 | #if defined(PNG_READ_tRNS_SUPPORTED) |
||
1046 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
||
1047 | png_handle_tRNS(png_ptr, info_ptr, length); |
||
1048 | #endif |
||
1049 | #if defined(PNG_READ_zTXt_SUPPORTED) |
||
1050 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
||
1051 | png_handle_zTXt(png_ptr, info_ptr, length); |
||
1052 | #endif |
||
1053 | #if defined(PNG_READ_iTXt_SUPPORTED) |
||
1054 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
||
1055 | png_handle_iTXt(png_ptr, info_ptr, length); |
||
1056 | #endif |
||
1057 | else |
||
1058 | png_handle_unknown(png_ptr, info_ptr, length); |
||
1059 | } while (!(png_ptr->mode & PNG_HAVE_IEND)); |
||
1060 | } |
||
1061 | |||
1062 | /* free all memory used by the read */ |
||
1063 | void PNGAPI |
||
1064 | png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, |
||
1065 | png_infopp end_info_ptr_ptr) |
||
1066 | { |
||
1067 | png_structp png_ptr = NULL; |
||
1068 | png_infop info_ptr = NULL, end_info_ptr = NULL; |
||
1069 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1070 | png_free_ptr free_fn = NULL; |
||
1071 | png_voidp mem_ptr = NULL; |
||
1072 | #endif |
||
1073 | |||
1074 | png_debug(1, "in png_destroy_read_struct\n"); |
||
1075 | if (png_ptr_ptr != NULL) |
||
1076 | png_ptr = *png_ptr_ptr; |
||
1077 | |||
1078 | if (info_ptr_ptr != NULL) |
||
1079 | info_ptr = *info_ptr_ptr; |
||
1080 | |||
1081 | if (end_info_ptr_ptr != NULL) |
||
1082 | end_info_ptr = *end_info_ptr_ptr; |
||
1083 | |||
1084 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1085 | free_fn = png_ptr->free_fn; |
||
1086 | mem_ptr = png_ptr->mem_ptr; |
||
1087 | #endif |
||
1088 | |||
1089 | png_read_destroy(png_ptr, info_ptr, end_info_ptr); |
||
1090 | |||
1091 | if (info_ptr != NULL) |
||
1092 | { |
||
1093 | #if defined(PNG_TEXT_SUPPORTED) |
||
1094 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); |
||
1095 | #endif |
||
1096 | |||
1097 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1098 | png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, |
||
1099 | (png_voidp)mem_ptr); |
||
1100 | #else |
||
1101 | png_destroy_struct((png_voidp)info_ptr); |
||
1102 | #endif |
||
1103 | *info_ptr_ptr = NULL; |
||
1104 | } |
||
1105 | |||
1106 | if (end_info_ptr != NULL) |
||
1107 | { |
||
1108 | #if defined(PNG_READ_TEXT_SUPPORTED) |
||
1109 | png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); |
||
1110 | #endif |
||
1111 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1112 | png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, |
||
1113 | (png_voidp)mem_ptr); |
||
1114 | #else |
||
1115 | png_destroy_struct((png_voidp)end_info_ptr); |
||
1116 | #endif |
||
1117 | *end_info_ptr_ptr = NULL; |
||
1118 | } |
||
1119 | |||
1120 | if (png_ptr != NULL) |
||
1121 | { |
||
1122 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1123 | png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, |
||
1124 | (png_voidp)mem_ptr); |
||
1125 | #else |
||
1126 | png_destroy_struct((png_voidp)png_ptr); |
||
1127 | #endif |
||
1128 | *png_ptr_ptr = NULL; |
||
1129 | } |
||
1130 | } |
||
1131 | |||
1132 | /* free all memory used by the read (old method) */ |
||
1133 | void /* PRIVATE */ |
||
1134 | png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) |
||
1135 | { |
||
1136 | #ifdef PNG_SETJMP_SUPPORTED |
||
1137 | jmp_buf tmp_jmp; |
||
1138 | #endif |
||
1139 | png_error_ptr error_fn; |
||
1140 | png_error_ptr warning_fn; |
||
1141 | png_voidp error_ptr; |
||
1142 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1143 | png_free_ptr free_fn; |
||
1144 | #endif |
||
1145 | |||
1146 | png_debug(1, "in png_read_destroy\n"); |
||
1147 | if (info_ptr != NULL) |
||
1148 | png_info_destroy(png_ptr, info_ptr); |
||
1149 | |||
1150 | if (end_info_ptr != NULL) |
||
1151 | png_info_destroy(png_ptr, end_info_ptr); |
||
1152 | |||
1153 | png_free(png_ptr, png_ptr->zbuf); |
||
1154 | png_free(png_ptr, png_ptr->big_row_buf); |
||
1155 | png_free(png_ptr, png_ptr->prev_row); |
||
1156 | #if defined(PNG_READ_DITHER_SUPPORTED) |
||
1157 | png_free(png_ptr, png_ptr->palette_lookup); |
||
1158 | png_free(png_ptr, png_ptr->dither_index); |
||
1159 | #endif |
||
1160 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
||
1161 | png_free(png_ptr, png_ptr->gamma_table); |
||
1162 | #endif |
||
1163 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
||
1164 | png_free(png_ptr, png_ptr->gamma_from_1); |
||
1165 | png_free(png_ptr, png_ptr->gamma_to_1); |
||
1166 | #endif |
||
1167 | #ifdef PNG_FREE_ME_SUPPORTED |
||
1168 | if (png_ptr->free_me & PNG_FREE_PLTE) |
||
1169 | png_zfree(png_ptr, png_ptr->palette); |
||
1170 | png_ptr->free_me &= ~PNG_FREE_PLTE; |
||
1171 | #else |
||
1172 | if (png_ptr->flags & PNG_FLAG_FREE_PLTE) |
||
1173 | png_zfree(png_ptr, png_ptr->palette); |
||
1174 | png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
||
1175 | #endif |
||
1176 | #if defined(PNG_tRNS_SUPPORTED) || \ |
||
1177 | defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
||
1178 | #ifdef PNG_FREE_ME_SUPPORTED |
||
1179 | if (png_ptr->free_me & PNG_FREE_TRNS) |
||
1180 | png_free(png_ptr, png_ptr->trans); |
||
1181 | png_ptr->free_me &= ~PNG_FREE_TRNS; |
||
1182 | #else |
||
1183 | if (png_ptr->flags & PNG_FLAG_FREE_TRNS) |
||
1184 | png_free(png_ptr, png_ptr->trans); |
||
1185 | png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
||
1186 | #endif |
||
1187 | #endif |
||
1188 | #if defined(PNG_READ_hIST_SUPPORTED) |
||
1189 | #ifdef PNG_FREE_ME_SUPPORTED |
||
1190 | if (png_ptr->free_me & PNG_FREE_HIST) |
||
1191 | png_free(png_ptr, png_ptr->hist); |
||
1192 | png_ptr->free_me &= ~PNG_FREE_HIST; |
||
1193 | #else |
||
1194 | if (png_ptr->flags & PNG_FLAG_FREE_HIST) |
||
1195 | png_free(png_ptr, png_ptr->hist); |
||
1196 | png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
||
1197 | #endif |
||
1198 | #endif |
||
1199 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
||
1200 | if (png_ptr->gamma_16_table != NULL) |
||
1201 | { |
||
1202 | int i; |
||
1203 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
||
1204 | for (i = 0; i < istop; i++) |
||
1205 | { |
||
1206 | png_free(png_ptr, png_ptr->gamma_16_table[i]); |
||
1207 | } |
||
1208 | png_free(png_ptr, png_ptr->gamma_16_table); |
||
1209 | } |
||
1210 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
||
1211 | if (png_ptr->gamma_16_from_1 != NULL) |
||
1212 | { |
||
1213 | int i; |
||
1214 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
||
1215 | for (i = 0; i < istop; i++) |
||
1216 | { |
||
1217 | png_free(png_ptr, png_ptr->gamma_16_from_1[i]); |
||
1218 | } |
||
1219 | png_free(png_ptr, png_ptr->gamma_16_from_1); |
||
1220 | } |
||
1221 | if (png_ptr->gamma_16_to_1 != NULL) |
||
1222 | { |
||
1223 | int i; |
||
1224 | int istop = (1 << (8 - png_ptr->gamma_shift)); |
||
1225 | for (i = 0; i < istop; i++) |
||
1226 | { |
||
1227 | png_free(png_ptr, png_ptr->gamma_16_to_1[i]); |
||
1228 | } |
||
1229 | png_free(png_ptr, png_ptr->gamma_16_to_1); |
||
1230 | } |
||
1231 | #endif |
||
1232 | #endif |
||
1233 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
||
1234 | png_free(png_ptr, png_ptr->time_buffer); |
||
1235 | #endif |
||
1236 | |||
1237 | inflateEnd(&png_ptr->zstream); |
||
1238 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
||
1239 | png_free(png_ptr, png_ptr->save_buffer); |
||
1240 | #endif |
||
1241 | |||
1242 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
||
1243 | #ifdef PNG_TEXT_SUPPORTED |
||
1244 | png_free(png_ptr, png_ptr->current_text); |
||
1245 | #endif /* PNG_TEXT_SUPPORTED */ |
||
1246 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
||
1247 | |||
1248 | /* Save the important info out of the png_struct, in case it is |
||
1249 | * being used again. |
||
1250 | */ |
||
1251 | #ifdef PNG_SETJMP_SUPPORTED |
||
1252 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
||
1253 | #endif |
||
1254 | |||
1255 | error_fn = png_ptr->error_fn; |
||
1256 | warning_fn = png_ptr->warning_fn; |
||
1257 | error_ptr = png_ptr->error_ptr; |
||
1258 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1259 | free_fn = png_ptr->free_fn; |
||
1260 | #endif |
||
1261 | |||
1262 | png_memset(png_ptr, 0, sizeof (png_struct)); |
||
1263 | |||
1264 | png_ptr->error_fn = error_fn; |
||
1265 | png_ptr->warning_fn = warning_fn; |
||
1266 | png_ptr->error_ptr = error_ptr; |
||
1267 | #ifdef PNG_USER_MEM_SUPPORTED |
||
1268 | png_ptr->free_fn = free_fn; |
||
1269 | #endif |
||
1270 | |||
1271 | #ifdef PNG_SETJMP_SUPPORTED |
||
1272 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
||
1273 | #endif |
||
1274 | |||
1275 | } |
||
1276 | |||
1277 | void PNGAPI |
||
1278 | png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) |
||
1279 | { |
||
1280 | png_ptr->read_row_fn = read_row_fn; |
||
1281 | } |
||
1282 | |||
1283 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
||
1284 | void PNGAPI |
||
1285 | png_read_png(png_structp png_ptr, png_infop info_ptr, |
||
1286 | int transforms, |
||
1287 | voidp params) |
||
1288 | { |
||
1289 | int row; |
||
1290 | |||
1291 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
||
1292 | /* invert the alpha channel from opacity to transparency */ |
||
1293 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
||
1294 | png_set_invert_alpha(png_ptr); |
||
1295 | #endif |
||
1296 | |||
1297 | /* The call to png_read_info() gives us all of the information from the |
||
1298 | * PNG file before the first IDAT (image data chunk). |
||
1299 | */ |
||
1300 | png_read_info(png_ptr, info_ptr); |
||
1301 | |||
1302 | /* -------------- image transformations start here ------------------- */ |
||
1303 | |||
1304 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
||
1305 | /* tell libpng to strip 16 bit/color files down to 8 bits/color */ |
||
1306 | if (transforms & PNG_TRANSFORM_STRIP_16) |
||
1307 | png_set_strip_16(png_ptr); |
||
1308 | #endif |
||
1309 | |||
1310 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
||
1311 | /* Strip alpha bytes from the input data without combining with the |
||
1312 | * background (not recommended). |
||
1313 | */ |
||
1314 | if (transforms & PNG_TRANSFORM_STRIP_ALPHA) |
||
1315 | png_set_strip_alpha(png_ptr); |
||
1316 | #endif |
||
1317 | |||
1318 | #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) |
||
1319 | /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single |
||
1320 | * byte into separate bytes (useful for paletted and grayscale images). |
||
1321 | */ |
||
1322 | if (transforms & PNG_TRANSFORM_PACKING) |
||
1323 | png_set_packing(png_ptr); |
||
1324 | #endif |
||
1325 | |||
1326 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) |
||
1327 | /* Change the order of packed pixels to least significant bit first |
||
1328 | * (not useful if you are using png_set_packing). */ |
||
1329 | if (transforms & PNG_TRANSFORM_PACKSWAP) |
||
1330 | png_set_packswap(png_ptr); |
||
1331 | #endif |
||
1332 | |||
1333 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
||
1334 | /* Expand paletted colors into true RGB triplets |
||
1335 | * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel |
||
1336 | * Expand paletted or RGB images with transparency to full alpha |
||
1337 | * channels so the data will be available as RGBA quartets. |
||
1338 | */ |
||
1339 | if (transforms & PNG_TRANSFORM_EXPAND) |
||
1340 | if ((png_ptr->bit_depth < 8) || |
||
1341 | (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || |
||
1342 | (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) |
||
1343 | png_set_expand(png_ptr); |
||
1344 | #endif |
||
1345 | |||
1346 | /* We don't handle background color or gamma transformation or dithering. */ |
||
1347 | |||
1348 | #if defined(PNG_READ_INVERT_SUPPORTED) |
||
1349 | /* invert monochrome files to have 0 as white and 1 as black */ |
||
1350 | if (transforms & PNG_TRANSFORM_INVERT_MONO) |
||
1351 | png_set_invert_mono(png_ptr); |
||
1352 | #endif |
||
1353 | |||
1354 | #if defined(PNG_READ_SHIFT_SUPPORTED) |
||
1355 | /* If you want to shift the pixel values from the range [0,255] or |
||
1356 | * [0,65535] to the original [0,7] or [0,31], or whatever range the |
||
1357 | * colors were originally in: |
||
1358 | */ |
||
1359 | if ((transforms & PNG_TRANSFORM_SHIFT) |
||
1360 | && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) |
||
1361 | { |
||
1362 | png_color_8p sig_bit; |
||
1363 | |||
1364 | png_get_sBIT(png_ptr, info_ptr, &sig_bit); |
||
1365 | png_set_shift(png_ptr, sig_bit); |
||
1366 | } |
||
1367 | #endif |
||
1368 | |||
1369 | #if defined(PNG_READ_BGR_SUPPORTED) |
||
1370 | /* flip the RGB pixels to BGR (or RGBA to BGRA) */ |
||
1371 | if (transforms & PNG_TRANSFORM_BGR) |
||
1372 | png_set_bgr(png_ptr); |
||
1373 | #endif |
||
1374 | |||
1375 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
||
1376 | /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */ |
||
1377 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
||
1378 | png_set_swap_alpha(png_ptr); |
||
1379 | #endif |
||
1380 | |||
1381 | #if defined(PNG_READ_SWAP_SUPPORTED) |
||
1382 | /* swap bytes of 16 bit files to least significant byte first */ |
||
1383 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
||
1384 | png_set_swap(png_ptr); |
||
1385 | #endif |
||
1386 | |||
1387 | /* We don't handle adding filler bytes */ |
||
1388 | |||
1389 | /* Optional call to gamma correct and add the background to the palette |
||
1390 | * and update info structure. REQUIRED if you are expecting libpng to |
||
1391 | * update the palette for you (i.e., you selected such a transform above). |
||
1392 | */ |
||
1393 | png_read_update_info(png_ptr, info_ptr); |
||
1394 | |||
1395 | /* -------------- image transformations end here ------------------- */ |
||
1396 | |||
1397 | #ifdef PNG_FREE_ME_SUPPORTED |
||
1398 | png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); |
||
1399 | #endif |
||
1400 | if(info_ptr->row_pointers == NULL) |
||
1401 | { |
||
1402 | info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, |
||
1403 | info_ptr->height * sizeof(png_bytep)); |
||
1404 | #ifdef PNG_FREE_ME_SUPPORTED |
||
1405 | info_ptr->free_me |= PNG_FREE_ROWS; |
||
1406 | #endif |
||
1407 | for (row = 0; row < (int)info_ptr->height; row++) |
||
1408 | { |
||
1409 | info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, |
||
1410 | png_get_rowbytes(png_ptr, info_ptr)); |
||
1411 | } |
||
1412 | } |
||
1413 | |||
1414 | png_read_image(png_ptr, info_ptr->row_pointers); |
||
1415 | info_ptr->valid |= PNG_INFO_IDAT; |
||
1416 | |||
1417 | /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
||
1418 | png_read_end(png_ptr, info_ptr); |
||
1419 | |||
1420 | if(transforms == 0 || params == NULL) |
||
1421 | /* quiet compiler warnings */ return; |
||
1422 | |||
1423 | } |
||
1424 | #endif |