2 /* png.c - location for general purpose libpng functions
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4 * Last changed in libpng 1.2.30 [August 15, 2008]
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5 * For conditions of distribution and use, see copyright notice in png.h
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6 * Copyright (c) 1998-2008 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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11 #define PNG_INTERNAL
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12 #define PNG_NO_EXTERN
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15 /* Generate a compiler error if there is an old png.h in the search path. */
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16 typedef version_1_2_33 Your_png_h_is_not_version_1_2_33;
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18 /* Version information for C files. This had better match the version
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19 * string defined in png.h. */
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21 #ifdef PNG_USE_GLOBAL_ARRAYS
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22 /* png_libpng_ver was changed to a function in version 1.0.5c */
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23 PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
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25 #ifdef PNG_READ_SUPPORTED
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27 /* png_sig was changed to a function in version 1.0.5c */
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28 /* Place to hold the signature string for a PNG file. */
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29 PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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30 #endif /* PNG_READ_SUPPORTED */
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32 /* Invoke global declarations for constant strings for known chunk types */
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55 #ifdef PNG_READ_SUPPORTED
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56 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
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58 /* start of interlace block */
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59 PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
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61 /* offset to next interlace block */
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62 PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
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64 /* start of interlace block in the y direction */
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65 PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
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67 /* offset to next interlace block in the y direction */
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68 PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
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70 /* Height of interlace block. This is not currently used - if you need
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71 * it, uncomment it here and in png.h
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72 PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
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75 /* Mask to determine which pixels are valid in a pass */
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76 PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
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78 /* Mask to determine which pixels to overwrite while displaying */
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79 PNG_CONST int FARDATA png_pass_dsp_mask[]
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80 = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
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82 #endif /* PNG_READ_SUPPORTED */
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83 #endif /* PNG_USE_GLOBAL_ARRAYS */
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85 /* Tells libpng that we have already handled the first "num_bytes" bytes
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86 * of the PNG file signature. If the PNG data is embedded into another
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87 * stream we can set num_bytes = 8 so that libpng will not attempt to read
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88 * or write any of the magic bytes before it starts on the IHDR.
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91 #ifdef PNG_READ_SUPPORTED
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93 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
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95 if (png_ptr == NULL) return;
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96 png_debug(1, "in png_set_sig_bytes\n");
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98 png_error(png_ptr, "Too many bytes for PNG signature.");
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100 png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
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103 /* Checks whether the supplied bytes match the PNG signature. We allow
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104 * checking less than the full 8-byte signature so that those apps that
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105 * already read the first few bytes of a file to determine the file type
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106 * can simply check the remaining bytes for extra assurance. Returns
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107 * an integer less than, equal to, or greater than zero if sig is found,
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108 * respectively, to be less than, to match, or be greater than the correct
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109 * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
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112 png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
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114 png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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115 if (num_to_check > 8)
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117 else if (num_to_check < 1)
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123 if (start + num_to_check > 8)
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124 num_to_check = 8 - start;
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126 return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
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129 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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130 /* (Obsolete) function to check signature bytes. It does not allow one
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131 * to check a partial signature. This function might be removed in the
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132 * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG.
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135 png_check_sig(png_bytep sig, int num)
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137 return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
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140 #endif /* PNG_READ_SUPPORTED */
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142 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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143 /* Function to allocate memory for zlib and clear it to 0. */
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147 voidpf /* private */
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149 png_zalloc(voidpf png_ptr, uInt items, uInt size)
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152 png_structp p=(png_structp)png_ptr;
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153 png_uint_32 save_flags=p->flags;
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154 png_uint_32 num_bytes;
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156 if (png_ptr == NULL) return (NULL);
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157 if (items > PNG_UINT_32_MAX/size)
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159 png_warning (p, "Potential overflow in png_zalloc()");
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162 num_bytes = (png_uint_32)items * size;
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164 p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
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165 ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
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166 p->flags=save_flags;
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168 #if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
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170 return ((voidpf)ptr);
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172 if (num_bytes > (png_uint_32)0x8000L)
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174 png_memset(ptr, 0, (png_size_t)0x8000L);
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175 png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
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176 (png_size_t)(num_bytes - (png_uint_32)0x8000L));
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180 png_memset(ptr, 0, (png_size_t)num_bytes);
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183 return ((voidpf)ptr);
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186 /* function to free memory for zlib */
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192 png_zfree(voidpf png_ptr, voidpf ptr)
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194 png_free((png_structp)png_ptr, (png_voidp)ptr);
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197 /* Reset the CRC variable to 32 bits of 1's. Care must be taken
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198 * in case CRC is > 32 bits to leave the top bits 0.
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201 png_reset_crc(png_structp png_ptr)
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203 png_ptr->crc = crc32(0, Z_NULL, 0);
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206 /* Calculate the CRC over a section of data. We can only pass as
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207 * much data to this routine as the largest single buffer size. We
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208 * also check that this data will actually be used before going to the
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209 * trouble of calculating it.
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212 png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
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216 if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
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218 if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
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219 (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
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222 else /* critical */
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224 if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
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229 png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
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232 /* Allocate the memory for an info_struct for the application. We don't
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233 * really need the png_ptr, but it could potentially be useful in the
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234 * future. This should be used in favour of malloc(png_sizeof(png_info))
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235 * and png_info_init() so that applications that want to use a shared
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236 * libpng don't have to be recompiled if png_info changes size.
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239 png_create_info_struct(png_structp png_ptr)
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241 png_infop info_ptr;
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243 png_debug(1, "in png_create_info_struct\n");
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244 if (png_ptr == NULL) return (NULL);
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245 #ifdef PNG_USER_MEM_SUPPORTED
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246 info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
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247 png_ptr->malloc_fn, png_ptr->mem_ptr);
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249 info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
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251 if (info_ptr != NULL)
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252 png_info_init_3(&info_ptr, png_sizeof(png_info));
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257 /* This function frees the memory associated with a single info struct.
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258 * Normally, one would use either png_destroy_read_struct() or
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259 * png_destroy_write_struct() to free an info struct, but this may be
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260 * useful for some applications.
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263 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
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265 png_infop info_ptr = NULL;
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266 if (png_ptr == NULL) return;
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268 png_debug(1, "in png_destroy_info_struct\n");
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269 if (info_ptr_ptr != NULL)
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270 info_ptr = *info_ptr_ptr;
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272 if (info_ptr != NULL)
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274 png_info_destroy(png_ptr, info_ptr);
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276 #ifdef PNG_USER_MEM_SUPPORTED
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277 png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
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280 png_destroy_struct((png_voidp)info_ptr);
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282 *info_ptr_ptr = NULL;
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286 /* Initialize the info structure. This is now an internal function (0.89)
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287 * and applications using it are urged to use png_create_info_struct()
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290 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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291 #undef png_info_init
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293 png_info_init(png_infop info_ptr)
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295 /* We only come here via pre-1.0.12-compiled applications */
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296 png_info_init_3(&info_ptr, 0);
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301 png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
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303 png_infop info_ptr = *ptr_ptr;
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305 if (info_ptr == NULL) return;
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307 png_debug(1, "in png_info_init_3\n");
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309 if (png_sizeof(png_info) > png_info_struct_size)
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311 png_destroy_struct(info_ptr);
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312 info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
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313 *ptr_ptr = info_ptr;
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316 /* set everything to 0 */
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317 png_memset(info_ptr, 0, png_sizeof(png_info));
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320 #ifdef PNG_FREE_ME_SUPPORTED
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322 png_data_freer(png_structp png_ptr, png_infop info_ptr,
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323 int freer, png_uint_32 mask)
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325 png_debug(1, "in png_data_freer\n");
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326 if (png_ptr == NULL || info_ptr == NULL)
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328 if (freer == PNG_DESTROY_WILL_FREE_DATA)
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329 info_ptr->free_me |= mask;
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330 else if (freer == PNG_USER_WILL_FREE_DATA)
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331 info_ptr->free_me &= ~mask;
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333 png_warning(png_ptr,
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334 "Unknown freer parameter in png_data_freer.");
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339 png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
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342 png_debug(1, "in png_free_data\n");
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343 if (png_ptr == NULL || info_ptr == NULL)
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346 #if defined(PNG_TEXT_SUPPORTED)
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347 /* free text item num or (if num == -1) all text items */
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348 #ifdef PNG_FREE_ME_SUPPORTED
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349 if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
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351 if (mask & PNG_FREE_TEXT)
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356 if (info_ptr->text && info_ptr->text[num].key)
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358 png_free(png_ptr, info_ptr->text[num].key);
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359 info_ptr->text[num].key = NULL;
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365 for (i = 0; i < info_ptr->num_text; i++)
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366 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
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367 png_free(png_ptr, info_ptr->text);
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368 info_ptr->text = NULL;
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369 info_ptr->num_text=0;
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374 #if defined(PNG_tRNS_SUPPORTED)
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375 /* free any tRNS entry */
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376 #ifdef PNG_FREE_ME_SUPPORTED
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377 if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
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379 if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
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382 png_free(png_ptr, info_ptr->trans);
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383 info_ptr->trans = NULL;
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384 info_ptr->valid &= ~PNG_INFO_tRNS;
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385 #ifndef PNG_FREE_ME_SUPPORTED
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386 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
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391 #if defined(PNG_sCAL_SUPPORTED)
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392 /* free any sCAL entry */
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393 #ifdef PNG_FREE_ME_SUPPORTED
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394 if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
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396 if (mask & PNG_FREE_SCAL)
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399 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
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400 png_free(png_ptr, info_ptr->scal_s_width);
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401 png_free(png_ptr, info_ptr->scal_s_height);
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402 info_ptr->scal_s_width = NULL;
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403 info_ptr->scal_s_height = NULL;
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405 info_ptr->valid &= ~PNG_INFO_sCAL;
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409 #if defined(PNG_pCAL_SUPPORTED)
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410 /* free any pCAL entry */
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411 #ifdef PNG_FREE_ME_SUPPORTED
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412 if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
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414 if (mask & PNG_FREE_PCAL)
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417 png_free(png_ptr, info_ptr->pcal_purpose);
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418 png_free(png_ptr, info_ptr->pcal_units);
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419 info_ptr->pcal_purpose = NULL;
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420 info_ptr->pcal_units = NULL;
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421 if (info_ptr->pcal_params != NULL)
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424 for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
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426 png_free(png_ptr, info_ptr->pcal_params[i]);
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427 info_ptr->pcal_params[i]=NULL;
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429 png_free(png_ptr, info_ptr->pcal_params);
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430 info_ptr->pcal_params = NULL;
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432 info_ptr->valid &= ~PNG_INFO_pCAL;
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436 #if defined(PNG_iCCP_SUPPORTED)
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437 /* free any iCCP entry */
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438 #ifdef PNG_FREE_ME_SUPPORTED
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439 if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
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441 if (mask & PNG_FREE_ICCP)
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444 png_free(png_ptr, info_ptr->iccp_name);
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445 png_free(png_ptr, info_ptr->iccp_profile);
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446 info_ptr->iccp_name = NULL;
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447 info_ptr->iccp_profile = NULL;
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448 info_ptr->valid &= ~PNG_INFO_iCCP;
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452 #if defined(PNG_sPLT_SUPPORTED)
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453 /* free a given sPLT entry, or (if num == -1) all sPLT entries */
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454 #ifdef PNG_FREE_ME_SUPPORTED
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455 if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
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457 if (mask & PNG_FREE_SPLT)
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462 if (info_ptr->splt_palettes)
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464 png_free(png_ptr, info_ptr->splt_palettes[num].name);
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465 png_free(png_ptr, info_ptr->splt_palettes[num].entries);
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466 info_ptr->splt_palettes[num].name = NULL;
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467 info_ptr->splt_palettes[num].entries = NULL;
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472 if (info_ptr->splt_palettes_num)
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475 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
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476 png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
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478 png_free(png_ptr, info_ptr->splt_palettes);
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479 info_ptr->splt_palettes = NULL;
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480 info_ptr->splt_palettes_num = 0;
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482 info_ptr->valid &= ~PNG_INFO_sPLT;
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487 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
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488 if (png_ptr->unknown_chunk.data)
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490 png_free(png_ptr, png_ptr->unknown_chunk.data);
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491 png_ptr->unknown_chunk.data = NULL;
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494 #ifdef PNG_FREE_ME_SUPPORTED
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495 if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
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497 if (mask & PNG_FREE_UNKN)
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502 if (info_ptr->unknown_chunks)
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504 png_free(png_ptr, info_ptr->unknown_chunks[num].data);
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505 info_ptr->unknown_chunks[num].data = NULL;
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512 if (info_ptr->unknown_chunks_num)
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514 for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
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515 png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
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517 png_free(png_ptr, info_ptr->unknown_chunks);
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518 info_ptr->unknown_chunks = NULL;
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519 info_ptr->unknown_chunks_num = 0;
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525 #if defined(PNG_hIST_SUPPORTED)
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526 /* free any hIST entry */
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527 #ifdef PNG_FREE_ME_SUPPORTED
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528 if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
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530 if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
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533 png_free(png_ptr, info_ptr->hist);
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534 info_ptr->hist = NULL;
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535 info_ptr->valid &= ~PNG_INFO_hIST;
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536 #ifndef PNG_FREE_ME_SUPPORTED
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537 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
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542 /* free any PLTE entry that was internally allocated */
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543 #ifdef PNG_FREE_ME_SUPPORTED
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544 if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
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546 if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
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549 png_zfree(png_ptr, info_ptr->palette);
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550 info_ptr->palette = NULL;
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551 info_ptr->valid &= ~PNG_INFO_PLTE;
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552 #ifndef PNG_FREE_ME_SUPPORTED
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553 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
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555 info_ptr->num_palette = 0;
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558 #if defined(PNG_INFO_IMAGE_SUPPORTED)
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559 /* free any image bits attached to the info structure */
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560 #ifdef PNG_FREE_ME_SUPPORTED
\r
561 if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
\r
563 if (mask & PNG_FREE_ROWS)
\r
566 if (info_ptr->row_pointers)
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569 for (row = 0; row < (int)info_ptr->height; row++)
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571 png_free(png_ptr, info_ptr->row_pointers[row]);
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572 info_ptr->row_pointers[row]=NULL;
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574 png_free(png_ptr, info_ptr->row_pointers);
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575 info_ptr->row_pointers=NULL;
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577 info_ptr->valid &= ~PNG_INFO_IDAT;
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581 #ifdef PNG_FREE_ME_SUPPORTED
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583 info_ptr->free_me &= ~mask;
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585 info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
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589 /* This is an internal routine to free any memory that the info struct is
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590 * pointing to before re-using it or freeing the struct itself. Recall
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591 * that png_free() checks for NULL pointers for us.
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594 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
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596 png_debug(1, "in png_info_destroy\n");
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598 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
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600 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
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601 if (png_ptr->num_chunk_list)
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603 png_free(png_ptr, png_ptr->chunk_list);
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604 png_ptr->chunk_list=NULL;
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605 png_ptr->num_chunk_list = 0;
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609 png_info_init_3(&info_ptr, png_sizeof(png_info));
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611 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
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613 /* This function returns a pointer to the io_ptr associated with the user
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614 * functions. The application should free any memory associated with this
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615 * pointer before png_write_destroy() or png_read_destroy() are called.
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618 png_get_io_ptr(png_structp png_ptr)
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620 if (png_ptr == NULL) return (NULL);
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621 return (png_ptr->io_ptr);
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624 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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625 #if !defined(PNG_NO_STDIO)
\r
626 /* Initialize the default input/output functions for the PNG file. If you
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627 * use your own read or write routines, you can call either png_set_read_fn()
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628 * or png_set_write_fn() instead of png_init_io(). If you have defined
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629 * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
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630 * necessarily available.
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633 png_init_io(png_structp png_ptr, png_FILE_p fp)
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635 png_debug(1, "in png_init_io\n");
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636 if (png_ptr == NULL) return;
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637 png_ptr->io_ptr = (png_voidp)fp;
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641 #if defined(PNG_TIME_RFC1123_SUPPORTED)
\r
642 /* Convert the supplied time into an RFC 1123 string suitable for use in
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643 * a "Creation Time" or other text-based time string.
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646 png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
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648 static PNG_CONST char short_months[12][4] =
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649 {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
\r
650 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
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652 if (png_ptr == NULL) return (NULL);
\r
653 if (png_ptr->time_buffer == NULL)
\r
655 png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
\r
656 png_sizeof(char)));
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659 #if defined(_WIN32_WCE)
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661 wchar_t time_buf[29];
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662 wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
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663 ptime->day % 32, short_months[(ptime->month - 1) % 12],
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664 ptime->year, ptime->hour % 24, ptime->minute % 60,
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665 ptime->second % 61);
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666 WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
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670 #ifdef USE_FAR_KEYWORD
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672 char near_time_buf[29];
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673 png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
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674 ptime->day % 32, short_months[(ptime->month - 1) % 12],
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675 ptime->year, ptime->hour % 24, ptime->minute % 60,
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676 ptime->second % 61);
\r
677 png_memcpy(png_ptr->time_buffer, near_time_buf,
\r
678 29*png_sizeof(char));
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681 png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
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682 ptime->day % 32, short_months[(ptime->month - 1) % 12],
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683 ptime->year, ptime->hour % 24, ptime->minute % 60,
\r
684 ptime->second % 61);
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686 #endif /* _WIN32_WCE */
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687 return ((png_charp)png_ptr->time_buffer);
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689 #endif /* PNG_TIME_RFC1123_SUPPORTED */
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691 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
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694 png_get_copyright(png_structp png_ptr)
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696 png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
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697 return ((png_charp) "\n libpng version 1.2.33 - October 31, 2008\n\
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698 Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
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699 Copyright (c) 1996-1997 Andreas Dilger\n\
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700 Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
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703 /* The following return the library version as a short string in the
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704 * format 1.0.0 through 99.99.99zz. To get the version of *.h files
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705 * used with your application, print out PNG_LIBPNG_VER_STRING, which
\r
706 * is defined in png.h.
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707 * Note: now there is no difference between png_get_libpng_ver() and
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708 * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard,
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709 * it is guaranteed that png.c uses the correct version of png.h.
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712 png_get_libpng_ver(png_structp png_ptr)
\r
714 /* Version of *.c files used when building libpng */
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715 png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
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716 return ((png_charp) PNG_LIBPNG_VER_STRING);
\r
720 png_get_header_ver(png_structp png_ptr)
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722 /* Version of *.h files used when building libpng */
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723 png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
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724 return ((png_charp) PNG_LIBPNG_VER_STRING);
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728 png_get_header_version(png_structp png_ptr)
\r
730 /* Returns longer string containing both version and date */
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731 png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
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732 return ((png_charp) PNG_HEADER_VERSION_STRING
\r
733 #ifndef PNG_READ_SUPPORTED
\r
734 " (NO READ SUPPORT)"
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739 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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740 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
\r
742 png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
\r
744 /* check chunk_name and return "keep" value if it's on the list, else 0 */
\r
747 if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
\r
749 p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
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750 for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
\r
751 if (!png_memcmp(chunk_name, p, 4))
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752 return ((int)*(p + 4));
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757 /* This function, added to libpng-1.0.6g, is untested. */
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759 png_reset_zstream(png_structp png_ptr)
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761 if (png_ptr == NULL) return Z_STREAM_ERROR;
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762 return (inflateReset(&png_ptr->zstream));
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764 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
\r
766 /* This function was added to libpng-1.0.7 */
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768 png_access_version_number(void)
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770 /* Version of *.c files used when building libpng */
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771 return((png_uint_32) PNG_LIBPNG_VER);
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775 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
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776 #if !defined(PNG_1_0_X)
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777 /* this function was added to libpng 1.2.0 */
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779 png_mmx_support(void)
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781 /* obsolete, to be removed from libpng-1.4.0 */
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784 #endif /* PNG_1_0_X */
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785 #endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
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787 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
\r
789 /* Added at libpng version 1.2.6 */
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790 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
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792 png_convert_size(size_t size)
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794 if (size > (png_size_t)-1)
\r
795 PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
\r
796 return ((png_size_t)size);
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798 #endif /* PNG_SIZE_T */
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799 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
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