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william |
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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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#define PNG_INTERNAL |
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#define PNG_NO_EXTERN |
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#include "png.h" |
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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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/* Version information for C files. This had better match the version |
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* string defined in png.h. */ |
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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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#ifdef PNG_READ_SUPPORTED |
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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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/* 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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#ifdef PNG_READ_SUPPORTED |
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/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
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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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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#endif /* PNG_READ_SUPPORTED */ |
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#endif /* PNG_USE_GLOBAL_ARRAYS */ |
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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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#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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png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); |
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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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if (start > 7) |
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return (-1); |
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if (start + num_to_check > 8) |
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num_to_check = 8 - start; |
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return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); |
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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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#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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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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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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#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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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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/* 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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/* 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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/* 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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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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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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/* 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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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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return (info_ptr); |
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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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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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if (info_ptr != NULL) |
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{ |
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png_info_destroy(png_ptr, info_ptr); |
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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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/* 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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void PNGAPI |
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png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) |
309 |
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{ |
310 |
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png_infop info_ptr = *ptr_ptr; |
311 |
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312 |
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if (info_ptr == NULL) |
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return; |
314 |
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315 |
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png_debug(1, "in png_info_init_3"); |
316 |
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317 |
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if (png_sizeof(png_info) > png_info_struct_size) |
318 |
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{ |
319 |
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png_destroy_struct(info_ptr); |
320 |
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info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); |
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*ptr_ptr = info_ptr; |
322 |
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} |
323 |
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324 |
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/* Set everything to 0 */ |
325 |
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png_memset(info_ptr, 0, png_sizeof(png_info)); |
326 |
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} |
327 |
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328 |
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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, |
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int freer, png_uint_32 mask) |
332 |
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{ |
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png_debug(1, "in png_data_freer"); |
334 |
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if (png_ptr == NULL || info_ptr == NULL) |
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return; |
336 |
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if (freer == PNG_DESTROY_WILL_FREE_DATA) |
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info_ptr->free_me |= mask; |
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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, |
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"Unknown freer parameter in png_data_freer."); |
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} |
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#endif |
345 |
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void PNGAPI |
347 |
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png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, |
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int num) |
349 |
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{ |
350 |
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png_debug(1, "in png_free_data"); |
351 |
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if (png_ptr == NULL || info_ptr == NULL) |
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return; |
353 |
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#if defined(PNG_TEXT_SUPPORTED) |
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/* Free text item num or (if num == -1) all text items */ |
356 |
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#ifdef PNG_FREE_ME_SUPPORTED |
357 |
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if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) |
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#else |
359 |
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if (mask & PNG_FREE_TEXT) |
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#endif |
361 |
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{ |
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if (num != -1) |
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{ |
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if (info_ptr->text && info_ptr->text[num].key) |
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{ |
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png_free(png_ptr, info_ptr->text[num].key); |
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info_ptr->text[num].key = NULL; |
368 |
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} |
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|
} |
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) */ |