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|
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/* png.c - location for general purpose libpng functions |
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* |
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* Last changed in libpng 1.2.39 [August 13, 2009] |
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson |
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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* |
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* This code is released under the libpng license. |
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* For conditions of distribution and use, see the disclaimer |
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* and license in png.h |
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*/ |
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|
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#define PNG_INTERNAL |
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#define PNG_NO_EXTERN |
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#include "png.h" |
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|
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/* Generate a compiler error if there is an old png.h in the search path. */ |
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typedef version_1_2_39 Your_png_h_is_not_version_1_2_39; |
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|
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/* Version information for C files. This had better match the version |
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* string defined in png.h. */ |
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|
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#ifdef PNG_USE_GLOBAL_ARRAYS |
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/* png_libpng_ver was changed to a function in version 1.0.5c */ |
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PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING; |
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|
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#ifdef PNG_READ_SUPPORTED |
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|
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/* png_sig was changed to a function in version 1.0.5c */ |
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/* Place to hold the signature string for a PNG file. */ |
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PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
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#endif /* PNG_READ_SUPPORTED */ |
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|
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/* Invoke global declarations for constant strings for known chunk types */ |
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PNG_IHDR; |
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PNG_IDAT; |
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PNG_IEND; |
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PNG_PLTE; |
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PNG_bKGD; |
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PNG_cHRM; |
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PNG_gAMA; |
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PNG_hIST; |
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PNG_iCCP; |
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PNG_iTXt; |
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PNG_oFFs; |
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PNG_pCAL; |
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PNG_sCAL; |
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PNG_pHYs; |
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PNG_sBIT; |
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PNG_sPLT; |
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PNG_sRGB; |
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PNG_tEXt; |
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PNG_tIME; |
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PNG_tRNS; |
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PNG_zTXt; |
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|
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#ifdef PNG_READ_SUPPORTED |
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/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
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|
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/* Start of interlace block */ |
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PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
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|
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/* Offset to next interlace block */ |
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PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
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|
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/* Start of interlace block in the y direction */ |
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PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
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|
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/* Offset to next interlace block in the y direction */ |
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PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
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|
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/* Height of interlace block. This is not currently used - if you need |
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* it, uncomment it here and in png.h |
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PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; |
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*/ |
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|
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/* Mask to determine which pixels are valid in a pass */ |
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PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
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|
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/* Mask to determine which pixels to overwrite while displaying */ |
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PNG_CONST int FARDATA png_pass_dsp_mask[] |
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= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
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|
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#endif /* PNG_READ_SUPPORTED */ |
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#endif /* PNG_USE_GLOBAL_ARRAYS */ |
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|
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/* Tells libpng that we have already handled the first "num_bytes" bytes |
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* of the PNG file signature. If the PNG data is embedded into another |
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* stream we can set num_bytes = 8 so that libpng will not attempt to read |
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* or write any of the magic bytes before it starts on the IHDR. |
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*/ |
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|
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#ifdef PNG_READ_SUPPORTED |
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void PNGAPI |
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png_set_sig_bytes(png_structp png_ptr, int num_bytes) |
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{ |
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if (png_ptr == NULL) |
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return; |
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png_debug(1, "in png_set_sig_bytes"); |
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if (num_bytes > 8) |
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png_error(png_ptr, "Too many bytes for PNG signature."); |
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|
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png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); |
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} |
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|
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/* Checks whether the supplied bytes match the PNG signature. We allow |
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* checking less than the full 8-byte signature so that those apps that |
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* already read the first few bytes of a file to determine the file type |
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* can simply check the remaining bytes for extra assurance. Returns |
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* an integer less than, equal to, or greater than zero if sig is found, |
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* respectively, to be less than, to match, or be greater than the correct |
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* PNG signature (this is the same behaviour as strcmp, memcmp, etc). |
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*/ |
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int PNGAPI |
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png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) |
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{ |
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png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
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if (num_to_check > 8) |
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num_to_check = 8; |
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else if (num_to_check < 1) |
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return (-1); |
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|
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if (start > 7) |
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return (-1); |
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|
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if (start + num_to_check > 8) |
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num_to_check = 8 - start; |
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|
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return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); |
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} |
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|
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
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/* (Obsolete) function to check signature bytes. It does not allow one |
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* to check a partial signature. This function might be removed in the |
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* future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG. |
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*/ |
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int PNGAPI |
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png_check_sig(png_bytep sig, int num) |
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{ |
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return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num)); |
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} |
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#endif |
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#endif /* PNG_READ_SUPPORTED */ |
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|
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
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/* Function to allocate memory for zlib and clear it to 0. */ |
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#ifdef PNG_1_0_X |
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voidpf PNGAPI |
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#else |
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voidpf /* PRIVATE */ |
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#endif |
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png_zalloc(voidpf png_ptr, uInt items, uInt size) |
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{ |
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png_voidp ptr; |
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png_structp p=(png_structp)png_ptr; |
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png_uint_32 save_flags=p->flags; |
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png_uint_32 num_bytes; |
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|
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if (png_ptr == NULL) |
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return (NULL); |
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if (items > PNG_UINT_32_MAX/size) |
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{ |
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png_warning (p, "Potential overflow in png_zalloc()"); |
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return (NULL); |
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} |
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num_bytes = (png_uint_32)items * size; |
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|
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p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; |
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ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); |
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p->flags=save_flags; |
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|
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#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO) |
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if (ptr == NULL) |
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return ((voidpf)ptr); |
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|
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if (num_bytes > (png_uint_32)0x8000L) |
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{ |
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png_memset(ptr, 0, (png_size_t)0x8000L); |
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png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0, |
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(png_size_t)(num_bytes - (png_uint_32)0x8000L)); |
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} |
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else |
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{ |
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png_memset(ptr, 0, (png_size_t)num_bytes); |
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} |
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#endif |
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return ((voidpf)ptr); |
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} |
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|
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/* Function to free memory for zlib */ |
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#ifdef PNG_1_0_X |
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void PNGAPI |
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#else |
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void /* PRIVATE */ |
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#endif |
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png_zfree(voidpf png_ptr, voidpf ptr) |
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{ |
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png_free((png_structp)png_ptr, (png_voidp)ptr); |
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} |
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|
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/* Reset the CRC variable to 32 bits of 1's. Care must be taken |
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* in case CRC is > 32 bits to leave the top bits 0. |
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*/ |
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void /* PRIVATE */ |
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png_reset_crc(png_structp png_ptr) |
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{ |
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png_ptr->crc = crc32(0, Z_NULL, 0); |
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} |
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|
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/* Calculate the CRC over a section of data. We can only pass as |
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* much data to this routine as the largest single buffer size. We |
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* also check that this data will actually be used before going to the |
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* trouble of calculating it. |
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*/ |
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void /* PRIVATE */ |
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png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) |
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{ |
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int need_crc = 1; |
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|
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if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ |
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{ |
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if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == |
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(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
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need_crc = 0; |
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} |
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else /* critical */ |
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{ |
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if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) |
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need_crc = 0; |
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} |
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|
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if (need_crc) |
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png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); |
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} |
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|
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/* Allocate the memory for an info_struct for the application. We don't |
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* really need the png_ptr, but it could potentially be useful in the |
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* future. This should be used in favour of malloc(png_sizeof(png_info)) |
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* and png_info_init() so that applications that want to use a shared |
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* libpng don't have to be recompiled if png_info changes size. |
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*/ |
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png_infop PNGAPI |
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png_create_info_struct(png_structp png_ptr) |
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{ |
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png_infop info_ptr; |
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|
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png_debug(1, "in png_create_info_struct"); |
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if (png_ptr == NULL) |
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return (NULL); |
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#ifdef PNG_USER_MEM_SUPPORTED |
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info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, |
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png_ptr->malloc_fn, png_ptr->mem_ptr); |
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#else |
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info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
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#endif |
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if (info_ptr != NULL) |
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png_info_init_3(&info_ptr, png_sizeof(png_info)); |
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|
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return (info_ptr); |
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} |
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|
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/* This function frees the memory associated with a single info struct. |
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* Normally, one would use either png_destroy_read_struct() or |
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* png_destroy_write_struct() to free an info struct, but this may be |
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* useful for some applications. |
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*/ |
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void PNGAPI |
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png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) |
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{ |
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png_infop info_ptr = NULL; |
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if (png_ptr == NULL) |
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return; |
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|
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png_debug(1, "in png_destroy_info_struct"); |
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if (info_ptr_ptr != NULL) |
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info_ptr = *info_ptr_ptr; |
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|
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if (info_ptr != NULL) |
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{ |
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png_info_destroy(png_ptr, info_ptr); |
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|
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#ifdef PNG_USER_MEM_SUPPORTED |
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png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, |
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png_ptr->mem_ptr); |
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#else |
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png_destroy_struct((png_voidp)info_ptr); |
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#endif |
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*info_ptr_ptr = NULL; |
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} |
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} |
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|
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/* Initialize the info structure. This is now an internal function (0.89) |
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* and applications using it are urged to use png_create_info_struct() |
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* instead. |
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*/ |
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
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#undef png_info_init |
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void PNGAPI |
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png_info_init(png_infop info_ptr) |
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{ |
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/* We only come here via pre-1.0.12-compiled applications */ |
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png_info_init_3(&info_ptr, 0); |
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} |
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#endif |
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|
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void PNGAPI |
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png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) |
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{ |
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png_infop info_ptr = *ptr_ptr; |
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|
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if (info_ptr == NULL) |
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return; |
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|
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png_debug(1, "in png_info_init_3"); |
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|
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if (png_sizeof(png_info) > png_info_struct_size) |
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{ |
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png_destroy_struct(info_ptr); |
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info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
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*ptr_ptr = info_ptr; |
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} |
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|
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/* Set everything to 0 */ |
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png_memset(info_ptr, 0, png_sizeof(png_info)); |
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} |
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|
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#ifdef PNG_FREE_ME_SUPPORTED |
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void PNGAPI |
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png_data_freer(png_structp png_ptr, png_infop info_ptr, |
| 331 |
int freer, png_uint_32 mask) |
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{ |
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png_debug(1, "in png_data_freer"); |
| 334 |
if (png_ptr == NULL || info_ptr == NULL) |
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return; |
| 336 |
if (freer == PNG_DESTROY_WILL_FREE_DATA) |
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info_ptr->free_me |= mask; |
| 338 |
else if (freer == PNG_USER_WILL_FREE_DATA) |
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info_ptr->free_me &= ~mask; |
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else |
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png_warning(png_ptr, |
| 342 |
"Unknown freer parameter in png_data_freer."); |
| 343 |
} |
| 344 |
#endif |
| 345 |
|
| 346 |
void PNGAPI |
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png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, |
| 348 |
int num) |
| 349 |
{ |
| 350 |
png_debug(1, "in png_free_data"); |
| 351 |
if (png_ptr == NULL || info_ptr == NULL) |
| 352 |
return; |
| 353 |
|
| 354 |
#if defined(PNG_TEXT_SUPPORTED) |
| 355 |
/* Free text item num or (if num == -1) all text items */ |
| 356 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 357 |
if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) |
| 358 |
#else |
| 359 |
if (mask & PNG_FREE_TEXT) |
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#endif |
| 361 |
{ |
| 362 |
if (num != -1) |
| 363 |
{ |
| 364 |
if (info_ptr->text && info_ptr->text[num].key) |
| 365 |
{ |
| 366 |
png_free(png_ptr, info_ptr->text[num].key); |
| 367 |
info_ptr->text[num].key = NULL; |
| 368 |
} |
| 369 |
} |
| 370 |
else |
| 371 |
{ |
| 372 |
int i; |
| 373 |
for (i = 0; i < info_ptr->num_text; i++) |
| 374 |
png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); |
| 375 |
png_free(png_ptr, info_ptr->text); |
| 376 |
info_ptr->text = NULL; |
| 377 |
info_ptr->num_text=0; |
| 378 |
} |
| 379 |
} |
| 380 |
#endif |
| 381 |
|
| 382 |
#if defined(PNG_tRNS_SUPPORTED) |
| 383 |
/* Free any tRNS entry */ |
| 384 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 385 |
if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) |
| 386 |
#else |
| 387 |
if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS)) |
| 388 |
#endif |
| 389 |
{ |
| 390 |
png_free(png_ptr, info_ptr->trans); |
| 391 |
info_ptr->trans = NULL; |
| 392 |
info_ptr->valid &= ~PNG_INFO_tRNS; |
| 393 |
#ifndef PNG_FREE_ME_SUPPORTED |
| 394 |
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
| 395 |
#endif |
| 396 |
} |
| 397 |
#endif |
| 398 |
|
| 399 |
#if defined(PNG_sCAL_SUPPORTED) |
| 400 |
/* Free any sCAL entry */ |
| 401 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 402 |
if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) |
| 403 |
#else |
| 404 |
if (mask & PNG_FREE_SCAL) |
| 405 |
#endif |
| 406 |
{ |
| 407 |
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 408 |
png_free(png_ptr, info_ptr->scal_s_width); |
| 409 |
png_free(png_ptr, info_ptr->scal_s_height); |
| 410 |
info_ptr->scal_s_width = NULL; |
| 411 |
info_ptr->scal_s_height = NULL; |
| 412 |
#endif |
| 413 |
info_ptr->valid &= ~PNG_INFO_sCAL; |
| 414 |
} |
| 415 |
#endif |
| 416 |
|
| 417 |
#if defined(PNG_pCAL_SUPPORTED) |
| 418 |
/* Free any pCAL entry */ |
| 419 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 420 |
if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) |
| 421 |
#else |
| 422 |
if (mask & PNG_FREE_PCAL) |
| 423 |
#endif |
| 424 |
{ |
| 425 |
png_free(png_ptr, info_ptr->pcal_purpose); |
| 426 |
png_free(png_ptr, info_ptr->pcal_units); |
| 427 |
info_ptr->pcal_purpose = NULL; |
| 428 |
info_ptr->pcal_units = NULL; |
| 429 |
if (info_ptr->pcal_params != NULL) |
| 430 |
{ |
| 431 |
int i; |
| 432 |
for (i = 0; i < (int)info_ptr->pcal_nparams; i++) |
| 433 |
{ |
| 434 |
png_free(png_ptr, info_ptr->pcal_params[i]); |
| 435 |
info_ptr->pcal_params[i]=NULL; |
| 436 |
} |
| 437 |
png_free(png_ptr, info_ptr->pcal_params); |
| 438 |
info_ptr->pcal_params = NULL; |
| 439 |
} |
| 440 |
info_ptr->valid &= ~PNG_INFO_pCAL; |
| 441 |
} |
| 442 |
#endif |
| 443 |
|
| 444 |
#if defined(PNG_iCCP_SUPPORTED) |
| 445 |
/* Free any iCCP entry */ |
| 446 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 447 |
if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) |
| 448 |
#else |
| 449 |
if (mask & PNG_FREE_ICCP) |
| 450 |
#endif |
| 451 |
{ |
| 452 |
png_free(png_ptr, info_ptr->iccp_name); |
| 453 |
png_free(png_ptr, info_ptr->iccp_profile); |
| 454 |
info_ptr->iccp_name = NULL; |
| 455 |
info_ptr->iccp_profile = NULL; |
| 456 |
info_ptr->valid &= ~PNG_INFO_iCCP; |
| 457 |
} |
| 458 |
#endif |
| 459 |
|
| 460 |
#if defined(PNG_sPLT_SUPPORTED) |
| 461 |
/* Free a given sPLT entry, or (if num == -1) all sPLT entries */ |
| 462 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 463 |
if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) |
| 464 |
#else |
| 465 |
if (mask & PNG_FREE_SPLT) |
| 466 |
#endif |
| 467 |
{ |
| 468 |
if (num != -1) |
| 469 |
{ |
| 470 |
if (info_ptr->splt_palettes) |
| 471 |
{ |
| 472 |
png_free(png_ptr, info_ptr->splt_palettes[num].name); |
| 473 |
png_free(png_ptr, info_ptr->splt_palettes[num].entries); |
| 474 |
info_ptr->splt_palettes[num].name = NULL; |
| 475 |
info_ptr->splt_palettes[num].entries = NULL; |
| 476 |
} |
| 477 |
} |
| 478 |
else |
| 479 |
{ |
| 480 |
if (info_ptr->splt_palettes_num) |
| 481 |
{ |
| 482 |
int i; |
| 483 |
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) |
| 484 |
png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); |
| 485 |
|
| 486 |
png_free(png_ptr, info_ptr->splt_palettes); |
| 487 |
info_ptr->splt_palettes = NULL; |
| 488 |
info_ptr->splt_palettes_num = 0; |
| 489 |
} |
| 490 |
info_ptr->valid &= ~PNG_INFO_sPLT; |
| 491 |
} |
| 492 |
} |
| 493 |
#endif |
| 494 |
|
| 495 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 496 |
if (png_ptr->unknown_chunk.data) |
| 497 |
{ |
| 498 |
png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 499 |
png_ptr->unknown_chunk.data = NULL; |
| 500 |
} |
| 501 |
|
| 502 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 503 |
if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) |
| 504 |
#else |
| 505 |
if (mask & PNG_FREE_UNKN) |
| 506 |
#endif |
| 507 |
{ |
| 508 |
if (num != -1) |
| 509 |
{ |
| 510 |
if (info_ptr->unknown_chunks) |
| 511 |
{ |
| 512 |
png_free(png_ptr, info_ptr->unknown_chunks[num].data); |
| 513 |
info_ptr->unknown_chunks[num].data = NULL; |
| 514 |
} |
| 515 |
} |
| 516 |
else |
| 517 |
{ |
| 518 |
int i; |
| 519 |
|
| 520 |
if (info_ptr->unknown_chunks_num) |
| 521 |
{ |
| 522 |
for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) |
| 523 |
png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); |
| 524 |
|
| 525 |
png_free(png_ptr, info_ptr->unknown_chunks); |
| 526 |
info_ptr->unknown_chunks = NULL; |
| 527 |
info_ptr->unknown_chunks_num = 0; |
| 528 |
} |
| 529 |
} |
| 530 |
} |
| 531 |
#endif |
| 532 |
|
| 533 |
#if defined(PNG_hIST_SUPPORTED) |
| 534 |
/* Free any hIST entry */ |
| 535 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 536 |
if ((mask & PNG_FREE_HIST) & info_ptr->free_me) |
| 537 |
#else |
| 538 |
if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST)) |
| 539 |
#endif |
| 540 |
{ |
| 541 |
png_free(png_ptr, info_ptr->hist); |
| 542 |
info_ptr->hist = NULL; |
| 543 |
info_ptr->valid &= ~PNG_INFO_hIST; |
| 544 |
#ifndef PNG_FREE_ME_SUPPORTED |
| 545 |
png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
| 546 |
#endif |
| 547 |
} |
| 548 |
#endif |
| 549 |
|
| 550 |
/* Free any PLTE entry that was internally allocated */ |
| 551 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 552 |
if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) |
| 553 |
#else |
| 554 |
if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE)) |
| 555 |
#endif |
| 556 |
{ |
| 557 |
png_zfree(png_ptr, info_ptr->palette); |
| 558 |
info_ptr->palette = NULL; |
| 559 |
info_ptr->valid &= ~PNG_INFO_PLTE; |
| 560 |
#ifndef PNG_FREE_ME_SUPPORTED |
| 561 |
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
| 562 |
#endif |
| 563 |
info_ptr->num_palette = 0; |
| 564 |
} |
| 565 |
|
| 566 |
#if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 567 |
/* Free any image bits attached to the info structure */ |
| 568 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 569 |
if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) |
| 570 |
#else |
| 571 |
if (mask & PNG_FREE_ROWS) |
| 572 |
#endif |
| 573 |
{ |
| 574 |
if (info_ptr->row_pointers) |
| 575 |
{ |
| 576 |
int row; |
| 577 |
for (row = 0; row < (int)info_ptr->height; row++) |
| 578 |
{ |
| 579 |
png_free(png_ptr, info_ptr->row_pointers[row]); |
| 580 |
info_ptr->row_pointers[row]=NULL; |
| 581 |
} |
| 582 |
png_free(png_ptr, info_ptr->row_pointers); |
| 583 |
info_ptr->row_pointers=NULL; |
| 584 |
} |
| 585 |
info_ptr->valid &= ~PNG_INFO_IDAT; |
| 586 |
} |
| 587 |
#endif |
| 588 |
|
| 589 |
#ifdef PNG_FREE_ME_SUPPORTED |
| 590 |
if (num == -1) |
| 591 |
info_ptr->free_me &= ~mask; |
| 592 |
else |
| 593 |
info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); |
| 594 |
#endif |
| 595 |
} |
| 596 |
|
| 597 |
/* This is an internal routine to free any memory that the info struct is |
| 598 |
* pointing to before re-using it or freeing the struct itself. Recall |
| 599 |
* that png_free() checks for NULL pointers for us. |
| 600 |
*/ |
| 601 |
void /* PRIVATE */ |
| 602 |
png_info_destroy(png_structp png_ptr, png_infop info_ptr) |
| 603 |
{ |
| 604 |
png_debug(1, "in png_info_destroy"); |
| 605 |
|
| 606 |
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); |
| 607 |
|
| 608 |
#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) |
| 609 |
if (png_ptr->num_chunk_list) |
| 610 |
{ |
| 611 |
png_free(png_ptr, png_ptr->chunk_list); |
| 612 |
png_ptr->chunk_list=NULL; |
| 613 |
png_ptr->num_chunk_list = 0; |
| 614 |
} |
| 615 |
#endif |
| 616 |
|
| 617 |
png_info_init_3(&info_ptr, png_sizeof(png_info)); |
| 618 |
} |
| 619 |
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 620 |
|
| 621 |
/* This function returns a pointer to the io_ptr associated with the user |
| 622 |
* functions. The application should free any memory associated with this |
| 623 |
* pointer before png_write_destroy() or png_read_destroy() are called. |
| 624 |
*/ |
| 625 |
png_voidp PNGAPI |
| 626 |
png_get_io_ptr(png_structp png_ptr) |
| 627 |
{ |
| 628 |
if (png_ptr == NULL) |
| 629 |
return (NULL); |
| 630 |
return (png_ptr->io_ptr); |
| 631 |
} |
| 632 |
|
| 633 |
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 634 |
#if !defined(PNG_NO_STDIO) |
| 635 |
/* Initialize the default input/output functions for the PNG file. If you |
| 636 |
* use your own read or write routines, you can call either png_set_read_fn() |
| 637 |
* or png_set_write_fn() instead of png_init_io(). If you have defined |
| 638 |
* PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't |
| 639 |
* necessarily available. |
| 640 |
*/ |
| 641 |
void PNGAPI |
| 642 |
png_init_io(png_structp png_ptr, png_FILE_p fp) |
| 643 |
{ |
| 644 |
png_debug(1, "in png_init_io"); |
| 645 |
if (png_ptr == NULL) |
| 646 |
return; |
| 647 |
png_ptr->io_ptr = (png_voidp)fp; |
| 648 |
} |
| 649 |
#endif |
| 650 |
|
| 651 |
#if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 652 |
/* Convert the supplied time into an RFC 1123 string suitable for use in |
| 653 |
* a "Creation Time" or other text-based time string. |
| 654 |
*/ |
| 655 |
png_charp PNGAPI |
| 656 |
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) |
| 657 |
{ |
| 658 |
static PNG_CONST char short_months[12][4] = |
| 659 |
{"Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| 660 |
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; |
| 661 |
|
| 662 |
if (png_ptr == NULL) |
| 663 |
return (NULL); |
| 664 |
if (png_ptr->time_buffer == NULL) |
| 665 |
{ |
| 666 |
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* |
| 667 |
png_sizeof(char))); |
| 668 |
} |
| 669 |
|
| 670 |
#if defined(_WIN32_WCE) |
| 671 |
{ |
| 672 |
wchar_t time_buf[29]; |
| 673 |
wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), |
| 674 |
ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 675 |
ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 676 |
ptime->second % 61); |
| 677 |
WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29, |
| 678 |
NULL, NULL); |
| 679 |
} |
| 680 |
#else |
| 681 |
#ifdef USE_FAR_KEYWORD |
| 682 |
{ |
| 683 |
char near_time_buf[29]; |
| 684 |
png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", |
| 685 |
ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 686 |
ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 687 |
ptime->second % 61); |
| 688 |
png_memcpy(png_ptr->time_buffer, near_time_buf, |
| 689 |
29*png_sizeof(char)); |
| 690 |
} |
| 691 |
#else |
| 692 |
png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", |
| 693 |
ptime->day % 32, short_months[(ptime->month - 1) % 12], |
| 694 |
ptime->year, ptime->hour % 24, ptime->minute % 60, |
| 695 |
ptime->second % 61); |
| 696 |
#endif |
| 697 |
#endif /* _WIN32_WCE */ |
| 698 |
return ((png_charp)png_ptr->time_buffer); |
| 699 |
} |
| 700 |
#endif /* PNG_TIME_RFC1123_SUPPORTED */ |
| 701 |
|
| 702 |
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 703 |
|
| 704 |
png_charp PNGAPI |
| 705 |
png_get_copyright(png_structp png_ptr) |
| 706 |
{ |
| 707 |
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ |
| 708 |
return ((png_charp) "\n libpng version 1.2.39 - August 13, 2009\n\ |
| 709 |
Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\ |
| 710 |
Copyright (c) 1996-1997 Andreas Dilger\n\ |
| 711 |
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); |
| 712 |
} |
| 713 |
|
| 714 |
/* The following return the library version as a short string in the |
| 715 |
* format 1.0.0 through 99.99.99zz. To get the version of *.h files |
| 716 |
* used with your application, print out PNG_LIBPNG_VER_STRING, which |
| 717 |
* is defined in png.h. |
| 718 |
* Note: now there is no difference between png_get_libpng_ver() and |
| 719 |
* png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, |
| 720 |
* it is guaranteed that png.c uses the correct version of png.h. |
| 721 |
*/ |
| 722 |
png_charp PNGAPI |
| 723 |
png_get_libpng_ver(png_structp png_ptr) |
| 724 |
{ |
| 725 |
/* Version of *.c files used when building libpng */ |
| 726 |
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ |
| 727 |
return ((png_charp) PNG_LIBPNG_VER_STRING); |
| 728 |
} |
| 729 |
|
| 730 |
png_charp PNGAPI |
| 731 |
png_get_header_ver(png_structp png_ptr) |
| 732 |
{ |
| 733 |
/* Version of *.h files used when building libpng */ |
| 734 |
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ |
| 735 |
return ((png_charp) PNG_LIBPNG_VER_STRING); |
| 736 |
} |
| 737 |
|
| 738 |
png_charp PNGAPI |
| 739 |
png_get_header_version(png_structp png_ptr) |
| 740 |
{ |
| 741 |
/* Returns longer string containing both version and date */ |
| 742 |
png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */ |
| 743 |
return ((png_charp) PNG_HEADER_VERSION_STRING |
| 744 |
#ifndef PNG_READ_SUPPORTED |
| 745 |
" (NO READ SUPPORT)" |
| 746 |
#endif |
| 747 |
"\n"); |
| 748 |
} |
| 749 |
|
| 750 |
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 751 |
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 752 |
int PNGAPI |
| 753 |
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) |
| 754 |
{ |
| 755 |
/* Check chunk_name and return "keep" value if it's on the list, else 0 */ |
| 756 |
int i; |
| 757 |
png_bytep p; |
| 758 |
if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) |
| 759 |
return 0; |
| 760 |
p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5; |
| 761 |
for (i = png_ptr->num_chunk_list; i; i--, p -= 5) |
| 762 |
if (!png_memcmp(chunk_name, p, 4)) |
| 763 |
return ((int)*(p + 4)); |
| 764 |
return 0; |
| 765 |
} |
| 766 |
#endif |
| 767 |
|
| 768 |
/* This function, added to libpng-1.0.6g, is untested. */ |
| 769 |
int PNGAPI |
| 770 |
png_reset_zstream(png_structp png_ptr) |
| 771 |
{ |
| 772 |
if (png_ptr == NULL) |
| 773 |
return Z_STREAM_ERROR; |
| 774 |
return (inflateReset(&png_ptr->zstream)); |
| 775 |
} |
| 776 |
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
| 777 |
|
| 778 |
/* This function was added to libpng-1.0.7 */ |
| 779 |
png_uint_32 PNGAPI |
| 780 |
png_access_version_number(void) |
| 781 |
{ |
| 782 |
/* Version of *.c files used when building libpng */ |
| 783 |
return((png_uint_32) PNG_LIBPNG_VER); |
| 784 |
} |
| 785 |
|
| 786 |
|
| 787 |
#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 788 |
#if !defined(PNG_1_0_X) |
| 789 |
/* This function was added to libpng 1.2.0 */ |
| 790 |
int PNGAPI |
| 791 |
png_mmx_support(void) |
| 792 |
{ |
| 793 |
/* Obsolete, to be removed from libpng-1.4.0 */ |
| 794 |
return -1; |
| 795 |
} |
| 796 |
#endif /* PNG_1_0_X */ |
| 797 |
#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 798 |
|
| 799 |
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| 800 |
#ifdef PNG_SIZE_T |
| 801 |
/* Added at libpng version 1.2.6 */ |
| 802 |
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); |
| 803 |
png_size_t PNGAPI |
| 804 |
png_convert_size(size_t size) |
| 805 |
{ |
| 806 |
if (size > (png_size_t)-1) |
| 807 |
PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ |
| 808 |
return ((png_size_t)size); |
| 809 |
} |
| 810 |
#endif /* PNG_SIZE_T */ |
| 811 |
|
| 812 |
/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ |
| 813 |
#if defined(PNG_cHRM_SUPPORTED) |
| 814 |
#if !defined(PNG_NO_CHECK_cHRM) |
| 815 |
|
| 816 |
/* |
| 817 |
* Multiply two 32-bit numbers, V1 and V2, using 32-bit |
| 818 |
* arithmetic, to produce a 64 bit result in the HI/LO words. |
| 819 |
* |
| 820 |
* A B |
| 821 |
* x C D |
| 822 |
* ------ |
| 823 |
* AD || BD |
| 824 |
* AC || CB || 0 |
| 825 |
* |
| 826 |
* where A and B are the high and low 16-bit words of V1, |
| 827 |
* C and D are the 16-bit words of V2, AD is the product of |
| 828 |
* A and D, and X || Y is (X << 16) + Y. |
| 829 |
*/ |
| 830 |
|
| 831 |
void /* PRIVATE */ |
| 832 |
png_64bit_product (long v1, long v2, unsigned long *hi_product, |
| 833 |
unsigned long *lo_product) |
| 834 |
{ |
| 835 |
int a, b, c, d; |
| 836 |
long lo, hi, x, y; |
| 837 |
|
| 838 |
a = (v1 >> 16) & 0xffff; |
| 839 |
b = v1 & 0xffff; |
| 840 |
c = (v2 >> 16) & 0xffff; |
| 841 |
d = v2 & 0xffff; |
| 842 |
|
| 843 |
lo = b * d; /* BD */ |
| 844 |
x = a * d + c * b; /* AD + CB */ |
| 845 |
y = ((lo >> 16) & 0xffff) + x; |
| 846 |
|
| 847 |
lo = (lo & 0xffff) | ((y & 0xffff) << 16); |
| 848 |
hi = (y >> 16) & 0xffff; |
| 849 |
|
| 850 |
hi += a * c; /* AC */ |
| 851 |
|
| 852 |
*hi_product = (unsigned long)hi; |
| 853 |
*lo_product = (unsigned long)lo; |
| 854 |
} |
| 855 |
|
| 856 |
int /* PRIVATE */ |
| 857 |
png_check_cHRM_fixed(png_structp png_ptr, |
| 858 |
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, |
| 859 |
png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, |
| 860 |
png_fixed_point blue_x, png_fixed_point blue_y) |
| 861 |
{ |
| 862 |
int ret = 1; |
| 863 |
unsigned long xy_hi,xy_lo,yx_hi,yx_lo; |
| 864 |
|
| 865 |
png_debug(1, "in function png_check_cHRM_fixed"); |
| 866 |
if (png_ptr == NULL) |
| 867 |
return 0; |
| 868 |
|
| 869 |
if (white_x < 0 || white_y <= 0 || |
| 870 |
red_x < 0 || red_y < 0 || |
| 871 |
green_x < 0 || green_y < 0 || |
| 872 |
blue_x < 0 || blue_y < 0) |
| 873 |
{ |
| 874 |
png_warning(png_ptr, |
| 875 |
"Ignoring attempt to set negative chromaticity value"); |
| 876 |
ret = 0; |
| 877 |
} |
| 878 |
if (white_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 879 |
white_y > (png_fixed_point) PNG_UINT_31_MAX || |
| 880 |
red_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 881 |
red_y > (png_fixed_point) PNG_UINT_31_MAX || |
| 882 |
green_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 883 |
green_y > (png_fixed_point) PNG_UINT_31_MAX || |
| 884 |
blue_x > (png_fixed_point) PNG_UINT_31_MAX || |
| 885 |
blue_y > (png_fixed_point) PNG_UINT_31_MAX ) |
| 886 |
{ |
| 887 |
png_warning(png_ptr, |
| 888 |
"Ignoring attempt to set chromaticity value exceeding 21474.83"); |
| 889 |
ret = 0; |
| 890 |
} |
| 891 |
if (white_x > 100000L - white_y) |
| 892 |
{ |
| 893 |
png_warning(png_ptr, "Invalid cHRM white point"); |
| 894 |
ret = 0; |
| 895 |
} |
| 896 |
if (red_x > 100000L - red_y) |
| 897 |
{ |
| 898 |
png_warning(png_ptr, "Invalid cHRM red point"); |
| 899 |
ret = 0; |
| 900 |
} |
| 901 |
if (green_x > 100000L - green_y) |
| 902 |
{ |
| 903 |
png_warning(png_ptr, "Invalid cHRM green point"); |
| 904 |
ret = 0; |
| 905 |
} |
| 906 |
if (blue_x > 100000L - blue_y) |
| 907 |
{ |
| 908 |
png_warning(png_ptr, "Invalid cHRM blue point"); |
| 909 |
ret = 0; |
| 910 |
} |
| 911 |
|
| 912 |
png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); |
| 913 |
png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); |
| 914 |
|
| 915 |
if (xy_hi == yx_hi && xy_lo == yx_lo) |
| 916 |
{ |
| 917 |
png_warning(png_ptr, |
| 918 |
"Ignoring attempt to set cHRM RGB triangle with zero area"); |
| 919 |
ret = 0; |
| 920 |
} |
| 921 |
|
| 922 |
return ret; |
| 923 |
} |
| 924 |
#endif /* NO_PNG_CHECK_cHRM */ |
| 925 |
#endif /* PNG_cHRM_SUPPORTED */ |
| 926 |
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ |
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