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william |
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/* pngread.c - read a PNG file |
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* |
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* Last changed in libpng 1.2.37 [June 4, 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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* This file contains routines that an application calls directly to |
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* read a PNG file or stream. |
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*/ |
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#define PNG_INTERNAL |
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#include "png.h" |
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#if defined(PNG_READ_SUPPORTED) |
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/* Create a PNG structure for reading, and allocate any memory needed. */ |
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png_structp PNGAPI |
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png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr, |
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png_error_ptr error_fn, png_error_ptr warn_fn) |
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{ |
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#ifdef PNG_USER_MEM_SUPPORTED |
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return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, |
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warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL)); |
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} |
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/* Alternate create PNG structure for reading, and allocate any memory needed. */ |
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png_structp PNGAPI |
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png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, |
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png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
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png_malloc_ptr malloc_fn, png_free_ptr free_fn) |
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{ |
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#endif /* PNG_USER_MEM_SUPPORTED */ |
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#ifdef PNG_SETJMP_SUPPORTED |
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volatile |
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#endif |
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png_structp png_ptr; |
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#ifdef PNG_SETJMP_SUPPORTED |
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#ifdef USE_FAR_KEYWORD |
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jmp_buf jmpbuf; |
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#endif |
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#endif |
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int i; |
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png_debug(1, "in png_create_read_struct"); |
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#ifdef PNG_USER_MEM_SUPPORTED |
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png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, |
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(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); |
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#else |
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png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
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#endif |
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if (png_ptr == NULL) |
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return (NULL); |
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/* Added at libpng-1.2.6 */ |
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED |
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png_ptr->user_width_max=PNG_USER_WIDTH_MAX; |
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png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; |
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#endif |
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#ifdef PNG_SETJMP_SUPPORTED |
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#ifdef USE_FAR_KEYWORD |
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if (setjmp(jmpbuf)) |
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#else |
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if (setjmp(png_ptr->jmpbuf)) |
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#endif |
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{ |
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png_free(png_ptr, png_ptr->zbuf); |
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png_ptr->zbuf = NULL; |
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#ifdef PNG_USER_MEM_SUPPORTED |
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png_destroy_struct_2((png_voidp)png_ptr, |
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(png_free_ptr)free_fn, (png_voidp)mem_ptr); |
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#else |
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png_destroy_struct((png_voidp)png_ptr); |
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#endif |
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return (NULL); |
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} |
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#ifdef USE_FAR_KEYWORD |
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png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); |
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#endif |
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#endif |
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#ifdef PNG_USER_MEM_SUPPORTED |
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png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); |
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#endif |
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png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
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if (user_png_ver) |
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{ |
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i = 0; |
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do |
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{ |
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if (user_png_ver[i] != png_libpng_ver[i]) |
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
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} while (png_libpng_ver[i++]); |
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} |
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else |
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
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if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) |
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{ |
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/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
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* we must recompile any applications that use any older library version. |
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* For versions after libpng 1.0, we will be compatible, so we need |
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* only check the first digit. |
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*/ |
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if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
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(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || |
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(user_png_ver[0] == '0' && user_png_ver[2] < '9')) |
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{ |
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#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
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char msg[80]; |
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if (user_png_ver) |
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{ |
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png_snprintf(msg, 80, |
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"Application was compiled with png.h from libpng-%.20s", |
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user_png_ver); |
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png_warning(png_ptr, msg); |
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} |
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png_snprintf(msg, 80, |
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"Application is running with png.c from libpng-%.20s", |
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png_libpng_ver); |
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png_warning(png_ptr, msg); |
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#endif |
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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png_ptr->flags = 0; |
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#endif |
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png_error(png_ptr, |
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"Incompatible libpng version in application and library"); |
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} |
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} |
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/* Initialize zbuf - compression buffer */ |
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png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
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png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
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(png_uint_32)png_ptr->zbuf_size); |
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png_ptr->zstream.zalloc = png_zalloc; |
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png_ptr->zstream.zfree = png_zfree; |
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png_ptr->zstream.opaque = (voidpf)png_ptr; |
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switch (inflateInit(&png_ptr->zstream)) |
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{ |
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case Z_OK: /* Do nothing */ break; |
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case Z_MEM_ERROR: |
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case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break; |
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case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break; |
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default: png_error(png_ptr, "Unknown zlib error"); |
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} |
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png_ptr->zstream.next_out = png_ptr->zbuf; |
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
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png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
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#ifdef PNG_SETJMP_SUPPORTED |
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/* Applications that neglect to set up their own setjmp() and then encounter |
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a png_error() will longjmp here. Since the jmpbuf is then meaningless we |
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abort instead of returning. */ |
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#ifdef USE_FAR_KEYWORD |
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if (setjmp(jmpbuf)) |
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PNG_ABORT(); |
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png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf)); |
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#else |
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if (setjmp(png_ptr->jmpbuf)) |
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PNG_ABORT(); |
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#endif |
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#endif |
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return (png_ptr); |
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} |
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#if defined(PNG_1_0_X) || defined(PNG_1_2_X) |
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/* Initialize PNG structure for reading, and allocate any memory needed. |
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This interface is deprecated in favour of the png_create_read_struct(), |
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and it will disappear as of libpng-1.3.0. */ |
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#undef png_read_init |
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void PNGAPI |
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png_read_init(png_structp png_ptr) |
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{ |
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/* We only come here via pre-1.0.7-compiled applications */ |
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png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0); |
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} |
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void PNGAPI |
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png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver, |
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png_size_t png_struct_size, png_size_t png_info_size) |
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{ |
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/* We only come here via pre-1.0.12-compiled applications */ |
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if (png_ptr == NULL) |
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return; |
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#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE) |
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if (png_sizeof(png_struct) > png_struct_size || |
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png_sizeof(png_info) > png_info_size) |
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{ |
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char msg[80]; |
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png_ptr->warning_fn = NULL; |
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if (user_png_ver) |
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{ |
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png_snprintf(msg, 80, |
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"Application was compiled with png.h from libpng-%.20s", |
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user_png_ver); |
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png_warning(png_ptr, msg); |
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} |
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png_snprintf(msg, 80, |
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"Application is running with png.c from libpng-%.20s", |
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png_libpng_ver); |
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png_warning(png_ptr, msg); |
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} |
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#endif |
| 219 |
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if (png_sizeof(png_struct) > png_struct_size) |
| 220 |
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{ |
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png_ptr->error_fn = NULL; |
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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png_ptr->flags = 0; |
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#endif |
| 225 |
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png_error(png_ptr, |
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"The png struct allocated by the application for reading is too small."); |
| 227 |
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} |
| 228 |
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if (png_sizeof(png_info) > png_info_size) |
| 229 |
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{ |
| 230 |
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png_ptr->error_fn = NULL; |
| 231 |
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 232 |
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png_ptr->flags = 0; |
| 233 |
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#endif |
| 234 |
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png_error(png_ptr, |
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"The info struct allocated by application for reading is too small."); |
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} |
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png_read_init_3(&png_ptr, user_png_ver, png_struct_size); |
| 238 |
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} |
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#endif /* PNG_1_0_X || PNG_1_2_X */ |
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void PNGAPI |
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png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver, |
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png_size_t png_struct_size) |
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{ |
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#ifdef PNG_SETJMP_SUPPORTED |
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jmp_buf tmp_jmp; /* to save current jump buffer */ |
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#endif |
| 248 |
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| 249 |
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int i = 0; |
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png_structp png_ptr=*ptr_ptr; |
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| 253 |
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if (png_ptr == NULL) |
| 254 |
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return; |
| 255 |
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| 256 |
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do |
| 257 |
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{ |
| 258 |
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if (user_png_ver[i] != png_libpng_ver[i]) |
| 259 |
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{ |
| 260 |
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#ifdef PNG_LEGACY_SUPPORTED |
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; |
| 262 |
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#else |
| 263 |
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png_ptr->warning_fn = NULL; |
| 264 |
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png_warning(png_ptr, |
| 265 |
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"Application uses deprecated png_read_init() and should be recompiled."); |
| 266 |
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break; |
| 267 |
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#endif |
| 268 |
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} |
| 269 |
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} while (png_libpng_ver[i++]); |
| 270 |
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| 271 |
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png_debug(1, "in png_read_init_3"); |
| 272 |
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| 273 |
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#ifdef PNG_SETJMP_SUPPORTED |
| 274 |
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/* Save jump buffer and error functions */ |
| 275 |
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png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); |
| 276 |
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#endif |
| 277 |
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| 278 |
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if (png_sizeof(png_struct) > png_struct_size) |
| 279 |
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{ |
| 280 |
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png_destroy_struct(png_ptr); |
| 281 |
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*ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); |
| 282 |
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png_ptr = *ptr_ptr; |
| 283 |
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} |
| 284 |
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| 285 |
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/* Reset all variables to 0 */ |
| 286 |
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png_memset(png_ptr, 0, png_sizeof(png_struct)); |
| 287 |
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| 288 |
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#ifdef PNG_SETJMP_SUPPORTED |
| 289 |
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/* Restore jump buffer */ |
| 290 |
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png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); |
| 291 |
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#endif |
| 292 |
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| 293 |
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/* Added at libpng-1.2.6 */ |
| 294 |
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| 295 |
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png_ptr->user_width_max=PNG_USER_WIDTH_MAX; |
| 296 |
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png_ptr->user_height_max=PNG_USER_HEIGHT_MAX; |
| 297 |
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#endif |
| 298 |
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| 299 |
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/* Initialize zbuf - compression buffer */ |
| 300 |
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png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| 301 |
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png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| 302 |
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(png_uint_32)png_ptr->zbuf_size); |
| 303 |
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png_ptr->zstream.zalloc = png_zalloc; |
| 304 |
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png_ptr->zstream.zfree = png_zfree; |
| 305 |
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png_ptr->zstream.opaque = (voidpf)png_ptr; |
| 306 |
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| 307 |
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switch (inflateInit(&png_ptr->zstream)) |
| 308 |
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{ |
| 309 |
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case Z_OK: /* Do nothing */ break; |
| 310 |
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case Z_MEM_ERROR: |
| 311 |
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case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break; |
| 312 |
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case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break; |
| 313 |
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default: png_error(png_ptr, "Unknown zlib error"); |
| 314 |
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} |
| 315 |
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| 316 |
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png_ptr->zstream.next_out = png_ptr->zbuf; |
| 317 |
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png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 318 |
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| 319 |
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png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL); |
| 320 |
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} |
| 321 |
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| 322 |
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#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 323 |
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/* Read the information before the actual image data. This has been |
| 324 |
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* changed in v0.90 to allow reading a file that already has the magic |
| 325 |
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* bytes read from the stream. You can tell libpng how many bytes have |
| 326 |
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* been read from the beginning of the stream (up to the maximum of 8) |
| 327 |
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* via png_set_sig_bytes(), and we will only check the remaining bytes |
| 328 |
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* here. The application can then have access to the signature bytes we |
| 329 |
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* read if it is determined that this isn't a valid PNG file. |
| 330 |
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*/ |
| 331 |
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void PNGAPI |
| 332 |
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png_read_info(png_structp png_ptr, png_infop info_ptr) |
| 333 |
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{ |
| 334 |
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if (png_ptr == NULL || info_ptr == NULL) |
| 335 |
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return; |
| 336 |
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png_debug(1, "in png_read_info"); |
| 337 |
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/* If we haven't checked all of the PNG signature bytes, do so now. */ |
| 338 |
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if (png_ptr->sig_bytes < 8) |
| 339 |
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{ |
| 340 |
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png_size_t num_checked = png_ptr->sig_bytes, |
| 341 |
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num_to_check = 8 - num_checked; |
| 342 |
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| 343 |
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png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); |
| 344 |
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png_ptr->sig_bytes = 8; |
| 345 |
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| 346 |
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if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 347 |
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{ |
| 348 |
|
|
if (num_checked < 4 && |
| 349 |
|
|
png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 350 |
|
|
png_error(png_ptr, "Not a PNG file"); |
| 351 |
|
|
else |
| 352 |
|
|
png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 353 |
|
|
} |
| 354 |
|
|
if (num_checked < 3) |
| 355 |
|
|
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
| 356 |
|
|
} |
| 357 |
|
|
|
| 358 |
|
|
for (;;) |
| 359 |
|
|
{ |
| 360 |
|
|
#ifdef PNG_USE_LOCAL_ARRAYS |
| 361 |
|
|
PNG_CONST PNG_IHDR; |
| 362 |
|
|
PNG_CONST PNG_IDAT; |
| 363 |
|
|
PNG_CONST PNG_IEND; |
| 364 |
|
|
PNG_CONST PNG_PLTE; |
| 365 |
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) |
| 366 |
|
|
PNG_CONST PNG_bKGD; |
| 367 |
|
|
#endif |
| 368 |
|
|
#if defined(PNG_READ_cHRM_SUPPORTED) |
| 369 |
|
|
PNG_CONST PNG_cHRM; |
| 370 |
|
|
#endif |
| 371 |
|
|
#if defined(PNG_READ_gAMA_SUPPORTED) |
| 372 |
|
|
PNG_CONST PNG_gAMA; |
| 373 |
|
|
#endif |
| 374 |
|
|
#if defined(PNG_READ_hIST_SUPPORTED) |
| 375 |
|
|
PNG_CONST PNG_hIST; |
| 376 |
|
|
#endif |
| 377 |
|
|
#if defined(PNG_READ_iCCP_SUPPORTED) |
| 378 |
|
|
PNG_CONST PNG_iCCP; |
| 379 |
|
|
#endif |
| 380 |
|
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
| 381 |
|
|
PNG_CONST PNG_iTXt; |
| 382 |
|
|
#endif |
| 383 |
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) |
| 384 |
|
|
PNG_CONST PNG_oFFs; |
| 385 |
|
|
#endif |
| 386 |
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) |
| 387 |
|
|
PNG_CONST PNG_pCAL; |
| 388 |
|
|
#endif |
| 389 |
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) |
| 390 |
|
|
PNG_CONST PNG_pHYs; |
| 391 |
|
|
#endif |
| 392 |
|
|
#if defined(PNG_READ_sBIT_SUPPORTED) |
| 393 |
|
|
PNG_CONST PNG_sBIT; |
| 394 |
|
|
#endif |
| 395 |
|
|
#if defined(PNG_READ_sCAL_SUPPORTED) |
| 396 |
|
|
PNG_CONST PNG_sCAL; |
| 397 |
|
|
#endif |
| 398 |
|
|
#if defined(PNG_READ_sPLT_SUPPORTED) |
| 399 |
|
|
PNG_CONST PNG_sPLT; |
| 400 |
|
|
#endif |
| 401 |
|
|
#if defined(PNG_READ_sRGB_SUPPORTED) |
| 402 |
|
|
PNG_CONST PNG_sRGB; |
| 403 |
|
|
#endif |
| 404 |
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
| 405 |
|
|
PNG_CONST PNG_tEXt; |
| 406 |
|
|
#endif |
| 407 |
|
|
#if defined(PNG_READ_tIME_SUPPORTED) |
| 408 |
|
|
PNG_CONST PNG_tIME; |
| 409 |
|
|
#endif |
| 410 |
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) |
| 411 |
|
|
PNG_CONST PNG_tRNS; |
| 412 |
|
|
#endif |
| 413 |
|
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
| 414 |
|
|
PNG_CONST PNG_zTXt; |
| 415 |
|
|
#endif |
| 416 |
|
|
#endif /* PNG_USE_LOCAL_ARRAYS */ |
| 417 |
|
|
png_uint_32 length = png_read_chunk_header(png_ptr); |
| 418 |
|
|
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; |
| 419 |
|
|
|
| 420 |
|
|
/* This should be a binary subdivision search or a hash for |
| 421 |
|
|
* matching the chunk name rather than a linear search. |
| 422 |
|
|
*/ |
| 423 |
|
|
if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 424 |
|
|
if (png_ptr->mode & PNG_AFTER_IDAT) |
| 425 |
|
|
png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
| 426 |
|
|
|
| 427 |
|
|
if (!png_memcmp(chunk_name, png_IHDR, 4)) |
| 428 |
|
|
png_handle_IHDR(png_ptr, info_ptr, length); |
| 429 |
|
|
else if (!png_memcmp(chunk_name, png_IEND, 4)) |
| 430 |
|
|
png_handle_IEND(png_ptr, info_ptr, length); |
| 431 |
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 432 |
|
|
else if (png_handle_as_unknown(png_ptr, chunk_name)) |
| 433 |
|
|
{ |
| 434 |
|
|
if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 435 |
|
|
png_ptr->mode |= PNG_HAVE_IDAT; |
| 436 |
|
|
png_handle_unknown(png_ptr, info_ptr, length); |
| 437 |
|
|
if (!png_memcmp(chunk_name, png_PLTE, 4)) |
| 438 |
|
|
png_ptr->mode |= PNG_HAVE_PLTE; |
| 439 |
|
|
else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 440 |
|
|
{ |
| 441 |
|
|
if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 442 |
|
|
png_error(png_ptr, "Missing IHDR before IDAT"); |
| 443 |
|
|
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 444 |
|
|
!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 445 |
|
|
png_error(png_ptr, "Missing PLTE before IDAT"); |
| 446 |
|
|
break; |
| 447 |
|
|
} |
| 448 |
|
|
} |
| 449 |
|
|
#endif |
| 450 |
|
|
else if (!png_memcmp(chunk_name, png_PLTE, 4)) |
| 451 |
|
|
png_handle_PLTE(png_ptr, info_ptr, length); |
| 452 |
|
|
else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 453 |
|
|
{ |
| 454 |
|
|
if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 455 |
|
|
png_error(png_ptr, "Missing IHDR before IDAT"); |
| 456 |
|
|
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 457 |
|
|
!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 458 |
|
|
png_error(png_ptr, "Missing PLTE before IDAT"); |
| 459 |
|
|
|
| 460 |
|
|
png_ptr->idat_size = length; |
| 461 |
|
|
png_ptr->mode |= PNG_HAVE_IDAT; |
| 462 |
|
|
break; |
| 463 |
|
|
} |
| 464 |
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) |
| 465 |
|
|
else if (!png_memcmp(chunk_name, png_bKGD, 4)) |
| 466 |
|
|
png_handle_bKGD(png_ptr, info_ptr, length); |
| 467 |
|
|
#endif |
| 468 |
|
|
#if defined(PNG_READ_cHRM_SUPPORTED) |
| 469 |
|
|
else if (!png_memcmp(chunk_name, png_cHRM, 4)) |
| 470 |
|
|
png_handle_cHRM(png_ptr, info_ptr, length); |
| 471 |
|
|
#endif |
| 472 |
|
|
#if defined(PNG_READ_gAMA_SUPPORTED) |
| 473 |
|
|
else if (!png_memcmp(chunk_name, png_gAMA, 4)) |
| 474 |
|
|
png_handle_gAMA(png_ptr, info_ptr, length); |
| 475 |
|
|
#endif |
| 476 |
|
|
#if defined(PNG_READ_hIST_SUPPORTED) |
| 477 |
|
|
else if (!png_memcmp(chunk_name, png_hIST, 4)) |
| 478 |
|
|
png_handle_hIST(png_ptr, info_ptr, length); |
| 479 |
|
|
#endif |
| 480 |
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) |
| 481 |
|
|
else if (!png_memcmp(chunk_name, png_oFFs, 4)) |
| 482 |
|
|
png_handle_oFFs(png_ptr, info_ptr, length); |
| 483 |
|
|
#endif |
| 484 |
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) |
| 485 |
|
|
else if (!png_memcmp(chunk_name, png_pCAL, 4)) |
| 486 |
|
|
png_handle_pCAL(png_ptr, info_ptr, length); |
| 487 |
|
|
#endif |
| 488 |
|
|
#if defined(PNG_READ_sCAL_SUPPORTED) |
| 489 |
|
|
else if (!png_memcmp(chunk_name, png_sCAL, 4)) |
| 490 |
|
|
png_handle_sCAL(png_ptr, info_ptr, length); |
| 491 |
|
|
#endif |
| 492 |
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) |
| 493 |
|
|
else if (!png_memcmp(chunk_name, png_pHYs, 4)) |
| 494 |
|
|
png_handle_pHYs(png_ptr, info_ptr, length); |
| 495 |
|
|
#endif |
| 496 |
|
|
#if defined(PNG_READ_sBIT_SUPPORTED) |
| 497 |
|
|
else if (!png_memcmp(chunk_name, png_sBIT, 4)) |
| 498 |
|
|
png_handle_sBIT(png_ptr, info_ptr, length); |
| 499 |
|
|
#endif |
| 500 |
|
|
#if defined(PNG_READ_sRGB_SUPPORTED) |
| 501 |
|
|
else if (!png_memcmp(chunk_name, png_sRGB, 4)) |
| 502 |
|
|
png_handle_sRGB(png_ptr, info_ptr, length); |
| 503 |
|
|
#endif |
| 504 |
|
|
#if defined(PNG_READ_iCCP_SUPPORTED) |
| 505 |
|
|
else if (!png_memcmp(chunk_name, png_iCCP, 4)) |
| 506 |
|
|
png_handle_iCCP(png_ptr, info_ptr, length); |
| 507 |
|
|
#endif |
| 508 |
|
|
#if defined(PNG_READ_sPLT_SUPPORTED) |
| 509 |
|
|
else if (!png_memcmp(chunk_name, png_sPLT, 4)) |
| 510 |
|
|
png_handle_sPLT(png_ptr, info_ptr, length); |
| 511 |
|
|
#endif |
| 512 |
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
| 513 |
|
|
else if (!png_memcmp(chunk_name, png_tEXt, 4)) |
| 514 |
|
|
png_handle_tEXt(png_ptr, info_ptr, length); |
| 515 |
|
|
#endif |
| 516 |
|
|
#if defined(PNG_READ_tIME_SUPPORTED) |
| 517 |
|
|
else if (!png_memcmp(chunk_name, png_tIME, 4)) |
| 518 |
|
|
png_handle_tIME(png_ptr, info_ptr, length); |
| 519 |
|
|
#endif |
| 520 |
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) |
| 521 |
|
|
else if (!png_memcmp(chunk_name, png_tRNS, 4)) |
| 522 |
|
|
png_handle_tRNS(png_ptr, info_ptr, length); |
| 523 |
|
|
#endif |
| 524 |
|
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
| 525 |
|
|
else if (!png_memcmp(chunk_name, png_zTXt, 4)) |
| 526 |
|
|
png_handle_zTXt(png_ptr, info_ptr, length); |
| 527 |
|
|
#endif |
| 528 |
|
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
| 529 |
|
|
else if (!png_memcmp(chunk_name, png_iTXt, 4)) |
| 530 |
|
|
png_handle_iTXt(png_ptr, info_ptr, length); |
| 531 |
|
|
#endif |
| 532 |
|
|
else |
| 533 |
|
|
png_handle_unknown(png_ptr, info_ptr, length); |
| 534 |
|
|
} |
| 535 |
|
|
} |
| 536 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 537 |
|
|
|
| 538 |
|
|
/* Optional call to update the users info_ptr structure */ |
| 539 |
|
|
void PNGAPI |
| 540 |
|
|
png_read_update_info(png_structp png_ptr, png_infop info_ptr) |
| 541 |
|
|
{ |
| 542 |
|
|
png_debug(1, "in png_read_update_info"); |
| 543 |
|
|
if (png_ptr == NULL) |
| 544 |
|
|
return; |
| 545 |
|
|
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| 546 |
|
|
png_read_start_row(png_ptr); |
| 547 |
|
|
else |
| 548 |
|
|
png_warning(png_ptr, |
| 549 |
|
|
"Ignoring extra png_read_update_info() call; row buffer not reallocated"); |
| 550 |
|
|
png_read_transform_info(png_ptr, info_ptr); |
| 551 |
|
|
} |
| 552 |
|
|
|
| 553 |
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 554 |
|
|
/* Initialize palette, background, etc, after transformations |
| 555 |
|
|
* are set, but before any reading takes place. This allows |
| 556 |
|
|
* the user to obtain a gamma-corrected palette, for example. |
| 557 |
|
|
* If the user doesn't call this, we will do it ourselves. |
| 558 |
|
|
*/ |
| 559 |
|
|
void PNGAPI |
| 560 |
|
|
png_start_read_image(png_structp png_ptr) |
| 561 |
|
|
{ |
| 562 |
|
|
png_debug(1, "in png_start_read_image"); |
| 563 |
|
|
if (png_ptr == NULL) |
| 564 |
|
|
return; |
| 565 |
|
|
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| 566 |
|
|
png_read_start_row(png_ptr); |
| 567 |
|
|
} |
| 568 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 569 |
|
|
|
| 570 |
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 571 |
|
|
void PNGAPI |
| 572 |
|
|
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) |
| 573 |
|
|
{ |
| 574 |
|
|
#ifdef PNG_USE_LOCAL_ARRAYS |
| 575 |
|
|
PNG_CONST PNG_IDAT; |
| 576 |
|
|
PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, |
| 577 |
|
|
0xff}; |
| 578 |
|
|
PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
| 579 |
|
|
#endif |
| 580 |
|
|
int ret; |
| 581 |
|
|
if (png_ptr == NULL) |
| 582 |
|
|
return; |
| 583 |
|
|
png_debug2(1, "in png_read_row (row %lu, pass %d)", |
| 584 |
|
|
png_ptr->row_number, png_ptr->pass); |
| 585 |
|
|
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) |
| 586 |
|
|
png_read_start_row(png_ptr); |
| 587 |
|
|
if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
| 588 |
|
|
{ |
| 589 |
|
|
/* Check for transforms that have been set but were defined out */ |
| 590 |
|
|
#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) |
| 591 |
|
|
if (png_ptr->transformations & PNG_INVERT_MONO) |
| 592 |
|
|
png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined."); |
| 593 |
|
|
#endif |
| 594 |
|
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) |
| 595 |
|
|
if (png_ptr->transformations & PNG_FILLER) |
| 596 |
|
|
png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined."); |
| 597 |
|
|
#endif |
| 598 |
|
|
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 599 |
|
|
if (png_ptr->transformations & PNG_PACKSWAP) |
| 600 |
|
|
png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined."); |
| 601 |
|
|
#endif |
| 602 |
|
|
#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) |
| 603 |
|
|
if (png_ptr->transformations & PNG_PACK) |
| 604 |
|
|
png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined."); |
| 605 |
|
|
#endif |
| 606 |
|
|
#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) |
| 607 |
|
|
if (png_ptr->transformations & PNG_SHIFT) |
| 608 |
|
|
png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined."); |
| 609 |
|
|
#endif |
| 610 |
|
|
#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) |
| 611 |
|
|
if (png_ptr->transformations & PNG_BGR) |
| 612 |
|
|
png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined."); |
| 613 |
|
|
#endif |
| 614 |
|
|
#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) |
| 615 |
|
|
if (png_ptr->transformations & PNG_SWAP_BYTES) |
| 616 |
|
|
png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined."); |
| 617 |
|
|
#endif |
| 618 |
|
|
} |
| 619 |
|
|
|
| 620 |
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 621 |
|
|
/* If interlaced and we do not need a new row, combine row and return */ |
| 622 |
|
|
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 623 |
|
|
{ |
| 624 |
|
|
switch (png_ptr->pass) |
| 625 |
|
|
{ |
| 626 |
|
|
case 0: |
| 627 |
|
|
if (png_ptr->row_number & 0x07) |
| 628 |
|
|
{ |
| 629 |
|
|
if (dsp_row != NULL) |
| 630 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 631 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 632 |
|
|
png_read_finish_row(png_ptr); |
| 633 |
|
|
return; |
| 634 |
|
|
} |
| 635 |
|
|
break; |
| 636 |
|
|
case 1: |
| 637 |
|
|
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) |
| 638 |
|
|
{ |
| 639 |
|
|
if (dsp_row != NULL) |
| 640 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 641 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 642 |
|
|
png_read_finish_row(png_ptr); |
| 643 |
|
|
return; |
| 644 |
|
|
} |
| 645 |
|
|
break; |
| 646 |
|
|
case 2: |
| 647 |
|
|
if ((png_ptr->row_number & 0x07) != 4) |
| 648 |
|
|
{ |
| 649 |
|
|
if (dsp_row != NULL && (png_ptr->row_number & 4)) |
| 650 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 651 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 652 |
|
|
png_read_finish_row(png_ptr); |
| 653 |
|
|
return; |
| 654 |
|
|
} |
| 655 |
|
|
break; |
| 656 |
|
|
case 3: |
| 657 |
|
|
if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
| 658 |
|
|
{ |
| 659 |
|
|
if (dsp_row != NULL) |
| 660 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 661 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 662 |
|
|
png_read_finish_row(png_ptr); |
| 663 |
|
|
return; |
| 664 |
|
|
} |
| 665 |
|
|
break; |
| 666 |
|
|
case 4: |
| 667 |
|
|
if ((png_ptr->row_number & 3) != 2) |
| 668 |
|
|
{ |
| 669 |
|
|
if (dsp_row != NULL && (png_ptr->row_number & 2)) |
| 670 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 671 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 672 |
|
|
png_read_finish_row(png_ptr); |
| 673 |
|
|
return; |
| 674 |
|
|
} |
| 675 |
|
|
break; |
| 676 |
|
|
case 5: |
| 677 |
|
|
if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
| 678 |
|
|
{ |
| 679 |
|
|
if (dsp_row != NULL) |
| 680 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 681 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 682 |
|
|
png_read_finish_row(png_ptr); |
| 683 |
|
|
return; |
| 684 |
|
|
} |
| 685 |
|
|
break; |
| 686 |
|
|
case 6: |
| 687 |
|
|
if (!(png_ptr->row_number & 1)) |
| 688 |
|
|
{ |
| 689 |
|
|
png_read_finish_row(png_ptr); |
| 690 |
|
|
return; |
| 691 |
|
|
} |
| 692 |
|
|
break; |
| 693 |
|
|
} |
| 694 |
|
|
} |
| 695 |
|
|
#endif |
| 696 |
|
|
|
| 697 |
|
|
if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| 698 |
|
|
png_error(png_ptr, "Invalid attempt to read row data"); |
| 699 |
|
|
|
| 700 |
|
|
png_ptr->zstream.next_out = png_ptr->row_buf; |
| 701 |
|
|
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 702 |
|
|
do |
| 703 |
|
|
{ |
| 704 |
|
|
if (!(png_ptr->zstream.avail_in)) |
| 705 |
|
|
{ |
| 706 |
|
|
while (!png_ptr->idat_size) |
| 707 |
|
|
{ |
| 708 |
|
|
png_crc_finish(png_ptr, 0); |
| 709 |
|
|
|
| 710 |
|
|
png_ptr->idat_size = png_read_chunk_header(png_ptr); |
| 711 |
|
|
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 712 |
|
|
png_error(png_ptr, "Not enough image data"); |
| 713 |
|
|
} |
| 714 |
|
|
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
| 715 |
|
|
png_ptr->zstream.next_in = png_ptr->zbuf; |
| 716 |
|
|
if (png_ptr->zbuf_size > png_ptr->idat_size) |
| 717 |
|
|
png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
| 718 |
|
|
png_crc_read(png_ptr, png_ptr->zbuf, |
| 719 |
|
|
(png_size_t)png_ptr->zstream.avail_in); |
| 720 |
|
|
png_ptr->idat_size -= png_ptr->zstream.avail_in; |
| 721 |
|
|
} |
| 722 |
|
|
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 723 |
|
|
if (ret == Z_STREAM_END) |
| 724 |
|
|
{ |
| 725 |
|
|
if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || |
| 726 |
|
|
png_ptr->idat_size) |
| 727 |
|
|
png_error(png_ptr, "Extra compressed data"); |
| 728 |
|
|
png_ptr->mode |= PNG_AFTER_IDAT; |
| 729 |
|
|
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 730 |
|
|
break; |
| 731 |
|
|
} |
| 732 |
|
|
if (ret != Z_OK) |
| 733 |
|
|
png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
| 734 |
|
|
"Decompression error"); |
| 735 |
|
|
|
| 736 |
|
|
} while (png_ptr->zstream.avail_out); |
| 737 |
|
|
|
| 738 |
|
|
png_ptr->row_info.color_type = png_ptr->color_type; |
| 739 |
|
|
png_ptr->row_info.width = png_ptr->iwidth; |
| 740 |
|
|
png_ptr->row_info.channels = png_ptr->channels; |
| 741 |
|
|
png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 742 |
|
|
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| 743 |
|
|
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| 744 |
|
|
png_ptr->row_info.width); |
| 745 |
|
|
|
| 746 |
|
|
if (png_ptr->row_buf[0]) |
| 747 |
|
|
png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| 748 |
|
|
png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 749 |
|
|
(int)(png_ptr->row_buf[0])); |
| 750 |
|
|
|
| 751 |
|
|
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| 752 |
|
|
png_ptr->rowbytes + 1); |
| 753 |
|
|
|
| 754 |
|
|
#if defined(PNG_MNG_FEATURES_SUPPORTED) |
| 755 |
|
|
if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && |
| 756 |
|
|
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) |
| 757 |
|
|
{ |
| 758 |
|
|
/* Intrapixel differencing */ |
| 759 |
|
|
png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 760 |
|
|
} |
| 761 |
|
|
#endif |
| 762 |
|
|
|
| 763 |
|
|
|
| 764 |
|
|
if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) |
| 765 |
|
|
png_do_read_transformations(png_ptr); |
| 766 |
|
|
|
| 767 |
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 768 |
|
|
/* Blow up interlaced rows to full size */ |
| 769 |
|
|
if (png_ptr->interlaced && |
| 770 |
|
|
(png_ptr->transformations & PNG_INTERLACE)) |
| 771 |
|
|
{ |
| 772 |
|
|
if (png_ptr->pass < 6) |
| 773 |
|
|
/* Old interface (pre-1.0.9): |
| 774 |
|
|
* png_do_read_interlace(&(png_ptr->row_info), |
| 775 |
|
|
* png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
| 776 |
|
|
*/ |
| 777 |
|
|
png_do_read_interlace(png_ptr); |
| 778 |
|
|
|
| 779 |
|
|
if (dsp_row != NULL) |
| 780 |
|
|
png_combine_row(png_ptr, dsp_row, |
| 781 |
|
|
png_pass_dsp_mask[png_ptr->pass]); |
| 782 |
|
|
if (row != NULL) |
| 783 |
|
|
png_combine_row(png_ptr, row, |
| 784 |
|
|
png_pass_mask[png_ptr->pass]); |
| 785 |
|
|
} |
| 786 |
|
|
else |
| 787 |
|
|
#endif |
| 788 |
|
|
{ |
| 789 |
|
|
if (row != NULL) |
| 790 |
|
|
png_combine_row(png_ptr, row, 0xff); |
| 791 |
|
|
if (dsp_row != NULL) |
| 792 |
|
|
png_combine_row(png_ptr, dsp_row, 0xff); |
| 793 |
|
|
} |
| 794 |
|
|
png_read_finish_row(png_ptr); |
| 795 |
|
|
|
| 796 |
|
|
if (png_ptr->read_row_fn != NULL) |
| 797 |
|
|
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
| 798 |
|
|
} |
| 799 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 800 |
|
|
|
| 801 |
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 802 |
|
|
/* Read one or more rows of image data. If the image is interlaced, |
| 803 |
|
|
* and png_set_interlace_handling() has been called, the rows need to |
| 804 |
|
|
* contain the contents of the rows from the previous pass. If the |
| 805 |
|
|
* image has alpha or transparency, and png_handle_alpha()[*] has been |
| 806 |
|
|
* called, the rows contents must be initialized to the contents of the |
| 807 |
|
|
* screen. |
| 808 |
|
|
* |
| 809 |
|
|
* "row" holds the actual image, and pixels are placed in it |
| 810 |
|
|
* as they arrive. If the image is displayed after each pass, it will |
| 811 |
|
|
* appear to "sparkle" in. "display_row" can be used to display a |
| 812 |
|
|
* "chunky" progressive image, with finer detail added as it becomes |
| 813 |
|
|
* available. If you do not want this "chunky" display, you may pass |
| 814 |
|
|
* NULL for display_row. If you do not want the sparkle display, and |
| 815 |
|
|
* you have not called png_handle_alpha(), you may pass NULL for rows. |
| 816 |
|
|
* If you have called png_handle_alpha(), and the image has either an |
| 817 |
|
|
* alpha channel or a transparency chunk, you must provide a buffer for |
| 818 |
|
|
* rows. In this case, you do not have to provide a display_row buffer |
| 819 |
|
|
* also, but you may. If the image is not interlaced, or if you have |
| 820 |
|
|
* not called png_set_interlace_handling(), the display_row buffer will |
| 821 |
|
|
* be ignored, so pass NULL to it. |
| 822 |
|
|
* |
| 823 |
|
|
* [*] png_handle_alpha() does not exist yet, as of this version of libpng |
| 824 |
|
|
*/ |
| 825 |
|
|
|
| 826 |
|
|
void PNGAPI |
| 827 |
|
|
png_read_rows(png_structp png_ptr, png_bytepp row, |
| 828 |
|
|
png_bytepp display_row, png_uint_32 num_rows) |
| 829 |
|
|
{ |
| 830 |
|
|
png_uint_32 i; |
| 831 |
|
|
png_bytepp rp; |
| 832 |
|
|
png_bytepp dp; |
| 833 |
|
|
|
| 834 |
|
|
png_debug(1, "in png_read_rows"); |
| 835 |
|
|
if (png_ptr == NULL) |
| 836 |
|
|
return; |
| 837 |
|
|
rp = row; |
| 838 |
|
|
dp = display_row; |
| 839 |
|
|
if (rp != NULL && dp != NULL) |
| 840 |
|
|
for (i = 0; i < num_rows; i++) |
| 841 |
|
|
{ |
| 842 |
|
|
png_bytep rptr = *rp++; |
| 843 |
|
|
png_bytep dptr = *dp++; |
| 844 |
|
|
|
| 845 |
|
|
png_read_row(png_ptr, rptr, dptr); |
| 846 |
|
|
} |
| 847 |
|
|
else if (rp != NULL) |
| 848 |
|
|
for (i = 0; i < num_rows; i++) |
| 849 |
|
|
{ |
| 850 |
|
|
png_bytep rptr = *rp; |
| 851 |
|
|
png_read_row(png_ptr, rptr, png_bytep_NULL); |
| 852 |
|
|
rp++; |
| 853 |
|
|
} |
| 854 |
|
|
else if (dp != NULL) |
| 855 |
|
|
for (i = 0; i < num_rows; i++) |
| 856 |
|
|
{ |
| 857 |
|
|
png_bytep dptr = *dp; |
| 858 |
|
|
png_read_row(png_ptr, png_bytep_NULL, dptr); |
| 859 |
|
|
dp++; |
| 860 |
|
|
} |
| 861 |
|
|
} |
| 862 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 863 |
|
|
|
| 864 |
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 865 |
|
|
/* Read the entire image. If the image has an alpha channel or a tRNS |
| 866 |
|
|
* chunk, and you have called png_handle_alpha()[*], you will need to |
| 867 |
|
|
* initialize the image to the current image that PNG will be overlaying. |
| 868 |
|
|
* We set the num_rows again here, in case it was incorrectly set in |
| 869 |
|
|
* png_read_start_row() by a call to png_read_update_info() or |
| 870 |
|
|
* png_start_read_image() if png_set_interlace_handling() wasn't called |
| 871 |
|
|
* prior to either of these functions like it should have been. You can |
| 872 |
|
|
* only call this function once. If you desire to have an image for |
| 873 |
|
|
* each pass of a interlaced image, use png_read_rows() instead. |
| 874 |
|
|
* |
| 875 |
|
|
* [*] png_handle_alpha() does not exist yet, as of this version of libpng |
| 876 |
|
|
*/ |
| 877 |
|
|
void PNGAPI |
| 878 |
|
|
png_read_image(png_structp png_ptr, png_bytepp image) |
| 879 |
|
|
{ |
| 880 |
|
|
png_uint_32 i, image_height; |
| 881 |
|
|
int pass, j; |
| 882 |
|
|
png_bytepp rp; |
| 883 |
|
|
|
| 884 |
|
|
png_debug(1, "in png_read_image"); |
| 885 |
|
|
if (png_ptr == NULL) |
| 886 |
|
|
return; |
| 887 |
|
|
|
| 888 |
|
|
#ifdef PNG_READ_INTERLACING_SUPPORTED |
| 889 |
|
|
pass = png_set_interlace_handling(png_ptr); |
| 890 |
|
|
#else |
| 891 |
|
|
if (png_ptr->interlaced) |
| 892 |
|
|
png_error(png_ptr, |
| 893 |
|
|
"Cannot read interlaced image -- interlace handler disabled."); |
| 894 |
|
|
pass = 1; |
| 895 |
|
|
#endif |
| 896 |
|
|
|
| 897 |
|
|
|
| 898 |
|
|
image_height=png_ptr->height; |
| 899 |
|
|
png_ptr->num_rows = image_height; /* Make sure this is set correctly */ |
| 900 |
|
|
|
| 901 |
|
|
for (j = 0; j < pass; j++) |
| 902 |
|
|
{ |
| 903 |
|
|
rp = image; |
| 904 |
|
|
for (i = 0; i < image_height; i++) |
| 905 |
|
|
{ |
| 906 |
|
|
png_read_row(png_ptr, *rp, png_bytep_NULL); |
| 907 |
|
|
rp++; |
| 908 |
|
|
} |
| 909 |
|
|
} |
| 910 |
|
|
} |
| 911 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 912 |
|
|
|
| 913 |
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 914 |
|
|
/* Read the end of the PNG file. Will not read past the end of the |
| 915 |
|
|
* file, will verify the end is accurate, and will read any comments |
| 916 |
|
|
* or time information at the end of the file, if info is not NULL. |
| 917 |
|
|
*/ |
| 918 |
|
|
void PNGAPI |
| 919 |
|
|
png_read_end(png_structp png_ptr, png_infop info_ptr) |
| 920 |
|
|
{ |
| 921 |
|
|
png_debug(1, "in png_read_end"); |
| 922 |
|
|
if (png_ptr == NULL) |
| 923 |
|
|
return; |
| 924 |
|
|
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ |
| 925 |
|
|
|
| 926 |
|
|
do |
| 927 |
|
|
{ |
| 928 |
|
|
#ifdef PNG_USE_LOCAL_ARRAYS |
| 929 |
|
|
PNG_CONST PNG_IHDR; |
| 930 |
|
|
PNG_CONST PNG_IDAT; |
| 931 |
|
|
PNG_CONST PNG_IEND; |
| 932 |
|
|
PNG_CONST PNG_PLTE; |
| 933 |
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) |
| 934 |
|
|
PNG_CONST PNG_bKGD; |
| 935 |
|
|
#endif |
| 936 |
|
|
#if defined(PNG_READ_cHRM_SUPPORTED) |
| 937 |
|
|
PNG_CONST PNG_cHRM; |
| 938 |
|
|
#endif |
| 939 |
|
|
#if defined(PNG_READ_gAMA_SUPPORTED) |
| 940 |
|
|
PNG_CONST PNG_gAMA; |
| 941 |
|
|
#endif |
| 942 |
|
|
#if defined(PNG_READ_hIST_SUPPORTED) |
| 943 |
|
|
PNG_CONST PNG_hIST; |
| 944 |
|
|
#endif |
| 945 |
|
|
#if defined(PNG_READ_iCCP_SUPPORTED) |
| 946 |
|
|
PNG_CONST PNG_iCCP; |
| 947 |
|
|
#endif |
| 948 |
|
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
| 949 |
|
|
PNG_CONST PNG_iTXt; |
| 950 |
|
|
#endif |
| 951 |
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) |
| 952 |
|
|
PNG_CONST PNG_oFFs; |
| 953 |
|
|
#endif |
| 954 |
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) |
| 955 |
|
|
PNG_CONST PNG_pCAL; |
| 956 |
|
|
#endif |
| 957 |
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) |
| 958 |
|
|
PNG_CONST PNG_pHYs; |
| 959 |
|
|
#endif |
| 960 |
|
|
#if defined(PNG_READ_sBIT_SUPPORTED) |
| 961 |
|
|
PNG_CONST PNG_sBIT; |
| 962 |
|
|
#endif |
| 963 |
|
|
#if defined(PNG_READ_sCAL_SUPPORTED) |
| 964 |
|
|
PNG_CONST PNG_sCAL; |
| 965 |
|
|
#endif |
| 966 |
|
|
#if defined(PNG_READ_sPLT_SUPPORTED) |
| 967 |
|
|
PNG_CONST PNG_sPLT; |
| 968 |
|
|
#endif |
| 969 |
|
|
#if defined(PNG_READ_sRGB_SUPPORTED) |
| 970 |
|
|
PNG_CONST PNG_sRGB; |
| 971 |
|
|
#endif |
| 972 |
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
| 973 |
|
|
PNG_CONST PNG_tEXt; |
| 974 |
|
|
#endif |
| 975 |
|
|
#if defined(PNG_READ_tIME_SUPPORTED) |
| 976 |
|
|
PNG_CONST PNG_tIME; |
| 977 |
|
|
#endif |
| 978 |
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) |
| 979 |
|
|
PNG_CONST PNG_tRNS; |
| 980 |
|
|
#endif |
| 981 |
|
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
| 982 |
|
|
PNG_CONST PNG_zTXt; |
| 983 |
|
|
#endif |
| 984 |
|
|
#endif /* PNG_USE_LOCAL_ARRAYS */ |
| 985 |
|
|
png_uint_32 length = png_read_chunk_header(png_ptr); |
| 986 |
|
|
PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; |
| 987 |
|
|
|
| 988 |
|
|
if (!png_memcmp(chunk_name, png_IHDR, 4)) |
| 989 |
|
|
png_handle_IHDR(png_ptr, info_ptr, length); |
| 990 |
|
|
else if (!png_memcmp(chunk_name, png_IEND, 4)) |
| 991 |
|
|
png_handle_IEND(png_ptr, info_ptr, length); |
| 992 |
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 993 |
|
|
else if (png_handle_as_unknown(png_ptr, chunk_name)) |
| 994 |
|
|
{ |
| 995 |
|
|
if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 996 |
|
|
{ |
| 997 |
|
|
if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 998 |
|
|
png_error(png_ptr, "Too many IDAT's found"); |
| 999 |
|
|
} |
| 1000 |
|
|
png_handle_unknown(png_ptr, info_ptr, length); |
| 1001 |
|
|
if (!png_memcmp(chunk_name, png_PLTE, 4)) |
| 1002 |
|
|
png_ptr->mode |= PNG_HAVE_PLTE; |
| 1003 |
|
|
} |
| 1004 |
|
|
#endif |
| 1005 |
|
|
else if (!png_memcmp(chunk_name, png_IDAT, 4)) |
| 1006 |
|
|
{ |
| 1007 |
|
|
/* Zero length IDATs are legal after the last IDAT has been |
| 1008 |
|
|
* read, but not after other chunks have been read. |
| 1009 |
|
|
*/ |
| 1010 |
|
|
if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
| 1011 |
|
|
png_error(png_ptr, "Too many IDAT's found"); |
| 1012 |
|
|
png_crc_finish(png_ptr, length); |
| 1013 |
|
|
} |
| 1014 |
|
|
else if (!png_memcmp(chunk_name, png_PLTE, 4)) |
| 1015 |
|
|
png_handle_PLTE(png_ptr, info_ptr, length); |
| 1016 |
|
|
#if defined(PNG_READ_bKGD_SUPPORTED) |
| 1017 |
|
|
else if (!png_memcmp(chunk_name, png_bKGD, 4)) |
| 1018 |
|
|
png_handle_bKGD(png_ptr, info_ptr, length); |
| 1019 |
|
|
#endif |
| 1020 |
|
|
#if defined(PNG_READ_cHRM_SUPPORTED) |
| 1021 |
|
|
else if (!png_memcmp(chunk_name, png_cHRM, 4)) |
| 1022 |
|
|
png_handle_cHRM(png_ptr, info_ptr, length); |
| 1023 |
|
|
#endif |
| 1024 |
|
|
#if defined(PNG_READ_gAMA_SUPPORTED) |
| 1025 |
|
|
else if (!png_memcmp(chunk_name, png_gAMA, 4)) |
| 1026 |
|
|
png_handle_gAMA(png_ptr, info_ptr, length); |
| 1027 |
|
|
#endif |
| 1028 |
|
|
#if defined(PNG_READ_hIST_SUPPORTED) |
| 1029 |
|
|
else if (!png_memcmp(chunk_name, png_hIST, 4)) |
| 1030 |
|
|
png_handle_hIST(png_ptr, info_ptr, length); |
| 1031 |
|
|
#endif |
| 1032 |
|
|
#if defined(PNG_READ_oFFs_SUPPORTED) |
| 1033 |
|
|
else if (!png_memcmp(chunk_name, png_oFFs, 4)) |
| 1034 |
|
|
png_handle_oFFs(png_ptr, info_ptr, length); |
| 1035 |
|
|
#endif |
| 1036 |
|
|
#if defined(PNG_READ_pCAL_SUPPORTED) |
| 1037 |
|
|
else if (!png_memcmp(chunk_name, png_pCAL, 4)) |
| 1038 |
|
|
png_handle_pCAL(png_ptr, info_ptr, length); |
| 1039 |
|
|
#endif |
| 1040 |
|
|
#if defined(PNG_READ_sCAL_SUPPORTED) |
| 1041 |
|
|
else if (!png_memcmp(chunk_name, png_sCAL, 4)) |
| 1042 |
|
|
png_handle_sCAL(png_ptr, info_ptr, length); |
| 1043 |
|
|
#endif |
| 1044 |
|
|
#if defined(PNG_READ_pHYs_SUPPORTED) |
| 1045 |
|
|
else if (!png_memcmp(chunk_name, png_pHYs, 4)) |
| 1046 |
|
|
png_handle_pHYs(png_ptr, info_ptr, length); |
| 1047 |
|
|
#endif |
| 1048 |
|
|
#if defined(PNG_READ_sBIT_SUPPORTED) |
| 1049 |
|
|
else if (!png_memcmp(chunk_name, png_sBIT, 4)) |
| 1050 |
|
|
png_handle_sBIT(png_ptr, info_ptr, length); |
| 1051 |
|
|
#endif |
| 1052 |
|
|
#if defined(PNG_READ_sRGB_SUPPORTED) |
| 1053 |
|
|
else if (!png_memcmp(chunk_name, png_sRGB, 4)) |
| 1054 |
|
|
png_handle_sRGB(png_ptr, info_ptr, length); |
| 1055 |
|
|
#endif |
| 1056 |
|
|
#if defined(PNG_READ_iCCP_SUPPORTED) |
| 1057 |
|
|
else if (!png_memcmp(chunk_name, png_iCCP, 4)) |
| 1058 |
|
|
png_handle_iCCP(png_ptr, info_ptr, length); |
| 1059 |
|
|
#endif |
| 1060 |
|
|
#if defined(PNG_READ_sPLT_SUPPORTED) |
| 1061 |
|
|
else if (!png_memcmp(chunk_name, png_sPLT, 4)) |
| 1062 |
|
|
png_handle_sPLT(png_ptr, info_ptr, length); |
| 1063 |
|
|
#endif |
| 1064 |
|
|
#if defined(PNG_READ_tEXt_SUPPORTED) |
| 1065 |
|
|
else if (!png_memcmp(chunk_name, png_tEXt, 4)) |
| 1066 |
|
|
png_handle_tEXt(png_ptr, info_ptr, length); |
| 1067 |
|
|
#endif |
| 1068 |
|
|
#if defined(PNG_READ_tIME_SUPPORTED) |
| 1069 |
|
|
else if (!png_memcmp(chunk_name, png_tIME, 4)) |
| 1070 |
|
|
png_handle_tIME(png_ptr, info_ptr, length); |
| 1071 |
|
|
#endif |
| 1072 |
|
|
#if defined(PNG_READ_tRNS_SUPPORTED) |
| 1073 |
|
|
else if (!png_memcmp(chunk_name, png_tRNS, 4)) |
| 1074 |
|
|
png_handle_tRNS(png_ptr, info_ptr, length); |
| 1075 |
|
|
#endif |
| 1076 |
|
|
#if defined(PNG_READ_zTXt_SUPPORTED) |
| 1077 |
|
|
else if (!png_memcmp(chunk_name, png_zTXt, 4)) |
| 1078 |
|
|
png_handle_zTXt(png_ptr, info_ptr, length); |
| 1079 |
|
|
#endif |
| 1080 |
|
|
#if defined(PNG_READ_iTXt_SUPPORTED) |
| 1081 |
|
|
else if (!png_memcmp(chunk_name, png_iTXt, 4)) |
| 1082 |
|
|
png_handle_iTXt(png_ptr, info_ptr, length); |
| 1083 |
|
|
#endif |
| 1084 |
|
|
else |
| 1085 |
|
|
png_handle_unknown(png_ptr, info_ptr, length); |
| 1086 |
|
|
} while (!(png_ptr->mode & PNG_HAVE_IEND)); |
| 1087 |
|
|
} |
| 1088 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 1089 |
|
|
|
| 1090 |
|
|
/* Free all memory used by the read */ |
| 1091 |
|
|
void PNGAPI |
| 1092 |
|
|
png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, |
| 1093 |
|
|
png_infopp end_info_ptr_ptr) |
| 1094 |
|
|
{ |
| 1095 |
|
|
png_structp png_ptr = NULL; |
| 1096 |
|
|
png_infop info_ptr = NULL, end_info_ptr = NULL; |
| 1097 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1098 |
|
|
png_free_ptr free_fn = NULL; |
| 1099 |
|
|
png_voidp mem_ptr = NULL; |
| 1100 |
|
|
#endif |
| 1101 |
|
|
|
| 1102 |
|
|
png_debug(1, "in png_destroy_read_struct"); |
| 1103 |
|
|
if (png_ptr_ptr != NULL) |
| 1104 |
|
|
png_ptr = *png_ptr_ptr; |
| 1105 |
|
|
if (png_ptr == NULL) |
| 1106 |
|
|
return; |
| 1107 |
|
|
|
| 1108 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1109 |
|
|
free_fn = png_ptr->free_fn; |
| 1110 |
|
|
mem_ptr = png_ptr->mem_ptr; |
| 1111 |
|
|
#endif |
| 1112 |
|
|
|
| 1113 |
|
|
if (info_ptr_ptr != NULL) |
| 1114 |
|
|
info_ptr = *info_ptr_ptr; |
| 1115 |
|
|
|
| 1116 |
|
|
if (end_info_ptr_ptr != NULL) |
| 1117 |
|
|
end_info_ptr = *end_info_ptr_ptr; |
| 1118 |
|
|
|
| 1119 |
|
|
png_read_destroy(png_ptr, info_ptr, end_info_ptr); |
| 1120 |
|
|
|
| 1121 |
|
|
if (info_ptr != NULL) |
| 1122 |
|
|
{ |
| 1123 |
|
|
#if defined(PNG_TEXT_SUPPORTED) |
| 1124 |
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); |
| 1125 |
|
|
#endif |
| 1126 |
|
|
|
| 1127 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1128 |
|
|
png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, |
| 1129 |
|
|
(png_voidp)mem_ptr); |
| 1130 |
|
|
#else |
| 1131 |
|
|
png_destroy_struct((png_voidp)info_ptr); |
| 1132 |
|
|
#endif |
| 1133 |
|
|
*info_ptr_ptr = NULL; |
| 1134 |
|
|
} |
| 1135 |
|
|
|
| 1136 |
|
|
if (end_info_ptr != NULL) |
| 1137 |
|
|
{ |
| 1138 |
|
|
#if defined(PNG_READ_TEXT_SUPPORTED) |
| 1139 |
|
|
png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); |
| 1140 |
|
|
#endif |
| 1141 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1142 |
|
|
png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, |
| 1143 |
|
|
(png_voidp)mem_ptr); |
| 1144 |
|
|
#else |
| 1145 |
|
|
png_destroy_struct((png_voidp)end_info_ptr); |
| 1146 |
|
|
#endif |
| 1147 |
|
|
*end_info_ptr_ptr = NULL; |
| 1148 |
|
|
} |
| 1149 |
|
|
|
| 1150 |
|
|
if (png_ptr != NULL) |
| 1151 |
|
|
{ |
| 1152 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1153 |
|
|
png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, |
| 1154 |
|
|
(png_voidp)mem_ptr); |
| 1155 |
|
|
#else |
| 1156 |
|
|
png_destroy_struct((png_voidp)png_ptr); |
| 1157 |
|
|
#endif |
| 1158 |
|
|
*png_ptr_ptr = NULL; |
| 1159 |
|
|
} |
| 1160 |
|
|
} |
| 1161 |
|
|
|
| 1162 |
|
|
/* Free all memory used by the read (old method) */ |
| 1163 |
|
|
void /* PRIVATE */ |
| 1164 |
|
|
png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr) |
| 1165 |
|
|
{ |
| 1166 |
|
|
#ifdef PNG_SETJMP_SUPPORTED |
| 1167 |
|
|
jmp_buf tmp_jmp; |
| 1168 |
|
|
#endif |
| 1169 |
|
|
png_error_ptr error_fn; |
| 1170 |
|
|
png_error_ptr warning_fn; |
| 1171 |
|
|
png_voidp error_ptr; |
| 1172 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1173 |
|
|
png_free_ptr free_fn; |
| 1174 |
|
|
#endif |
| 1175 |
|
|
|
| 1176 |
|
|
png_debug(1, "in png_read_destroy"); |
| 1177 |
|
|
if (info_ptr != NULL) |
| 1178 |
|
|
png_info_destroy(png_ptr, info_ptr); |
| 1179 |
|
|
|
| 1180 |
|
|
if (end_info_ptr != NULL) |
| 1181 |
|
|
png_info_destroy(png_ptr, end_info_ptr); |
| 1182 |
|
|
|
| 1183 |
|
|
png_free(png_ptr, png_ptr->zbuf); |
| 1184 |
|
|
png_free(png_ptr, png_ptr->big_row_buf); |
| 1185 |
|
|
png_free(png_ptr, png_ptr->prev_row); |
| 1186 |
|
|
png_free(png_ptr, png_ptr->chunkdata); |
| 1187 |
|
|
#if defined(PNG_READ_DITHER_SUPPORTED) |
| 1188 |
|
|
png_free(png_ptr, png_ptr->palette_lookup); |
| 1189 |
|
|
png_free(png_ptr, png_ptr->dither_index); |
| 1190 |
|
|
#endif |
| 1191 |
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) |
| 1192 |
|
|
png_free(png_ptr, png_ptr->gamma_table); |
| 1193 |
|
|
#endif |
| 1194 |
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1195 |
|
|
png_free(png_ptr, png_ptr->gamma_from_1); |
| 1196 |
|
|
png_free(png_ptr, png_ptr->gamma_to_1); |
| 1197 |
|
|
#endif |
| 1198 |
|
|
#ifdef PNG_FREE_ME_SUPPORTED |
| 1199 |
|
|
if (png_ptr->free_me & PNG_FREE_PLTE) |
| 1200 |
|
|
png_zfree(png_ptr, png_ptr->palette); |
| 1201 |
|
|
png_ptr->free_me &= ~PNG_FREE_PLTE; |
| 1202 |
|
|
#else |
| 1203 |
|
|
if (png_ptr->flags & PNG_FLAG_FREE_PLTE) |
| 1204 |
|
|
png_zfree(png_ptr, png_ptr->palette); |
| 1205 |
|
|
png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; |
| 1206 |
|
|
#endif |
| 1207 |
|
|
#if defined(PNG_tRNS_SUPPORTED) || \ |
| 1208 |
|
|
defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1209 |
|
|
#ifdef PNG_FREE_ME_SUPPORTED |
| 1210 |
|
|
if (png_ptr->free_me & PNG_FREE_TRNS) |
| 1211 |
|
|
png_free(png_ptr, png_ptr->trans); |
| 1212 |
|
|
png_ptr->free_me &= ~PNG_FREE_TRNS; |
| 1213 |
|
|
#else |
| 1214 |
|
|
if (png_ptr->flags & PNG_FLAG_FREE_TRNS) |
| 1215 |
|
|
png_free(png_ptr, png_ptr->trans); |
| 1216 |
|
|
png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; |
| 1217 |
|
|
#endif |
| 1218 |
|
|
#endif |
| 1219 |
|
|
#if defined(PNG_READ_hIST_SUPPORTED) |
| 1220 |
|
|
#ifdef PNG_FREE_ME_SUPPORTED |
| 1221 |
|
|
if (png_ptr->free_me & PNG_FREE_HIST) |
| 1222 |
|
|
png_free(png_ptr, png_ptr->hist); |
| 1223 |
|
|
png_ptr->free_me &= ~PNG_FREE_HIST; |
| 1224 |
|
|
#else |
| 1225 |
|
|
if (png_ptr->flags & PNG_FLAG_FREE_HIST) |
| 1226 |
|
|
png_free(png_ptr, png_ptr->hist); |
| 1227 |
|
|
png_ptr->flags &= ~PNG_FLAG_FREE_HIST; |
| 1228 |
|
|
#endif |
| 1229 |
|
|
#endif |
| 1230 |
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) |
| 1231 |
|
|
if (png_ptr->gamma_16_table != NULL) |
| 1232 |
|
|
{ |
| 1233 |
|
|
int i; |
| 1234 |
|
|
int istop = (1 << (8 - png_ptr->gamma_shift)); |
| 1235 |
|
|
for (i = 0; i < istop; i++) |
| 1236 |
|
|
{ |
| 1237 |
|
|
png_free(png_ptr, png_ptr->gamma_16_table[i]); |
| 1238 |
|
|
} |
| 1239 |
|
|
png_free(png_ptr, png_ptr->gamma_16_table); |
| 1240 |
|
|
} |
| 1241 |
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1242 |
|
|
if (png_ptr->gamma_16_from_1 != NULL) |
| 1243 |
|
|
{ |
| 1244 |
|
|
int i; |
| 1245 |
|
|
int istop = (1 << (8 - png_ptr->gamma_shift)); |
| 1246 |
|
|
for (i = 0; i < istop; i++) |
| 1247 |
|
|
{ |
| 1248 |
|
|
png_free(png_ptr, png_ptr->gamma_16_from_1[i]); |
| 1249 |
|
|
} |
| 1250 |
|
|
png_free(png_ptr, png_ptr->gamma_16_from_1); |
| 1251 |
|
|
} |
| 1252 |
|
|
if (png_ptr->gamma_16_to_1 != NULL) |
| 1253 |
|
|
{ |
| 1254 |
|
|
int i; |
| 1255 |
|
|
int istop = (1 << (8 - png_ptr->gamma_shift)); |
| 1256 |
|
|
for (i = 0; i < istop; i++) |
| 1257 |
|
|
{ |
| 1258 |
|
|
png_free(png_ptr, png_ptr->gamma_16_to_1[i]); |
| 1259 |
|
|
} |
| 1260 |
|
|
png_free(png_ptr, png_ptr->gamma_16_to_1); |
| 1261 |
|
|
} |
| 1262 |
|
|
#endif |
| 1263 |
|
|
#endif |
| 1264 |
|
|
#if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 1265 |
|
|
png_free(png_ptr, png_ptr->time_buffer); |
| 1266 |
|
|
#endif |
| 1267 |
|
|
|
| 1268 |
|
|
inflateEnd(&png_ptr->zstream); |
| 1269 |
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1270 |
|
|
png_free(png_ptr, png_ptr->save_buffer); |
| 1271 |
|
|
#endif |
| 1272 |
|
|
|
| 1273 |
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1274 |
|
|
#ifdef PNG_TEXT_SUPPORTED |
| 1275 |
|
|
png_free(png_ptr, png_ptr->current_text); |
| 1276 |
|
|
#endif /* PNG_TEXT_SUPPORTED */ |
| 1277 |
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1278 |
|
|
|
| 1279 |
|
|
/* Save the important info out of the png_struct, in case it is |
| 1280 |
|
|
* being used again. |
| 1281 |
|
|
*/ |
| 1282 |
|
|
#ifdef PNG_SETJMP_SUPPORTED |
| 1283 |
|
|
png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf)); |
| 1284 |
|
|
#endif |
| 1285 |
|
|
|
| 1286 |
|
|
error_fn = png_ptr->error_fn; |
| 1287 |
|
|
warning_fn = png_ptr->warning_fn; |
| 1288 |
|
|
error_ptr = png_ptr->error_ptr; |
| 1289 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1290 |
|
|
free_fn = png_ptr->free_fn; |
| 1291 |
|
|
#endif |
| 1292 |
|
|
|
| 1293 |
|
|
png_memset(png_ptr, 0, png_sizeof(png_struct)); |
| 1294 |
|
|
|
| 1295 |
|
|
png_ptr->error_fn = error_fn; |
| 1296 |
|
|
png_ptr->warning_fn = warning_fn; |
| 1297 |
|
|
png_ptr->error_ptr = error_ptr; |
| 1298 |
|
|
#ifdef PNG_USER_MEM_SUPPORTED |
| 1299 |
|
|
png_ptr->free_fn = free_fn; |
| 1300 |
|
|
#endif |
| 1301 |
|
|
|
| 1302 |
|
|
#ifdef PNG_SETJMP_SUPPORTED |
| 1303 |
|
|
png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); |
| 1304 |
|
|
#endif |
| 1305 |
|
|
|
| 1306 |
|
|
} |
| 1307 |
|
|
|
| 1308 |
|
|
void PNGAPI |
| 1309 |
|
|
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) |
| 1310 |
|
|
{ |
| 1311 |
|
|
if (png_ptr == NULL) |
| 1312 |
|
|
return; |
| 1313 |
|
|
png_ptr->read_row_fn = read_row_fn; |
| 1314 |
|
|
} |
| 1315 |
|
|
|
| 1316 |
|
|
|
| 1317 |
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 1318 |
|
|
#if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 1319 |
|
|
void PNGAPI |
| 1320 |
|
|
png_read_png(png_structp png_ptr, png_infop info_ptr, |
| 1321 |
|
|
int transforms, |
| 1322 |
|
|
voidp params) |
| 1323 |
|
|
{ |
| 1324 |
|
|
int row; |
| 1325 |
|
|
|
| 1326 |
|
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if (png_ptr == NULL) |
| 1327 |
|
|
return; |
| 1328 |
|
|
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
| 1329 |
|
|
/* Invert the alpha channel from opacity to transparency |
| 1330 |
|
|
*/ |
| 1331 |
|
|
if (transforms & PNG_TRANSFORM_INVERT_ALPHA) |
| 1332 |
|
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png_set_invert_alpha(png_ptr); |
| 1333 |
|
|
#endif |
| 1334 |
|
|
|
| 1335 |
|
|
/* png_read_info() gives us all of the information from the |
| 1336 |
|
|
* PNG file before the first IDAT (image data chunk). |
| 1337 |
|
|
*/ |
| 1338 |
|
|
png_read_info(png_ptr, info_ptr); |
| 1339 |
|
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if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) |
| 1340 |
|
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png_error(png_ptr, "Image is too high to process with png_read_png()"); |
| 1341 |
|
|
|
| 1342 |
|
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/* -------------- image transformations start here ------------------- */ |
| 1343 |
|
|
|
| 1344 |
|
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#if defined(PNG_READ_16_TO_8_SUPPORTED) |
| 1345 |
|
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/* Tell libpng to strip 16 bit/color files down to 8 bits per color. |
| 1346 |
|
|
*/ |
| 1347 |
|
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if (transforms & PNG_TRANSFORM_STRIP_16) |
| 1348 |
|
|
png_set_strip_16(png_ptr); |
| 1349 |
|
|
#endif |
| 1350 |
|
|
|
| 1351 |
|
|
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 1352 |
|
|
/* Strip alpha bytes from the input data without combining with |
| 1353 |
|
|
* the background (not recommended). |
| 1354 |
|
|
*/ |
| 1355 |
|
|
if (transforms & PNG_TRANSFORM_STRIP_ALPHA) |
| 1356 |
|
|
png_set_strip_alpha(png_ptr); |
| 1357 |
|
|
#endif |
| 1358 |
|
|
|
| 1359 |
|
|
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) |
| 1360 |
|
|
/* Extract multiple pixels with bit depths of 1, 2, or 4 from a single |
| 1361 |
|
|
* byte into separate bytes (useful for paletted and grayscale images). |
| 1362 |
|
|
*/ |
| 1363 |
|
|
if (transforms & PNG_TRANSFORM_PACKING) |
| 1364 |
|
|
png_set_packing(png_ptr); |
| 1365 |
|
|
#endif |
| 1366 |
|
|
|
| 1367 |
|
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 1368 |
|
|
/* Change the order of packed pixels to least significant bit first |
| 1369 |
|
|
* (not useful if you are using png_set_packing). |
| 1370 |
|
|
*/ |
| 1371 |
|
|
if (transforms & PNG_TRANSFORM_PACKSWAP) |
| 1372 |
|
|
png_set_packswap(png_ptr); |
| 1373 |
|
|
#endif |
| 1374 |
|
|
|
| 1375 |
|
|
#if defined(PNG_READ_EXPAND_SUPPORTED) |
| 1376 |
|
|
/* Expand paletted colors into true RGB triplets |
| 1377 |
|
|
* Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel |
| 1378 |
|
|
* Expand paletted or RGB images with transparency to full alpha |
| 1379 |
|
|
* channels so the data will be available as RGBA quartets. |
| 1380 |
|
|
*/ |
| 1381 |
|
|
if (transforms & PNG_TRANSFORM_EXPAND) |
| 1382 |
|
|
if ((png_ptr->bit_depth < 8) || |
| 1383 |
|
|
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || |
| 1384 |
|
|
(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) |
| 1385 |
|
|
png_set_expand(png_ptr); |
| 1386 |
|
|
#endif |
| 1387 |
|
|
|
| 1388 |
|
|
/* We don't handle background color or gamma transformation or dithering. |
| 1389 |
|
|
*/ |
| 1390 |
|
|
|
| 1391 |
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) |
| 1392 |
|
|
/* Invert monochrome files to have 0 as white and 1 as black |
| 1393 |
|
|
*/ |
| 1394 |
|
|
if (transforms & PNG_TRANSFORM_INVERT_MONO) |
| 1395 |
|
|
png_set_invert_mono(png_ptr); |
| 1396 |
|
|
#endif |
| 1397 |
|
|
|
| 1398 |
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED) |
| 1399 |
|
|
/* If you want to shift the pixel values from the range [0,255] or |
| 1400 |
|
|
* [0,65535] to the original [0,7] or [0,31], or whatever range the |
| 1401 |
|
|
* colors were originally in: |
| 1402 |
|
|
*/ |
| 1403 |
|
|
if ((transforms & PNG_TRANSFORM_SHIFT) |
| 1404 |
|
|
&& png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) |
| 1405 |
|
|
{ |
| 1406 |
|
|
png_color_8p sig_bit; |
| 1407 |
|
|
|
| 1408 |
|
|
png_get_sBIT(png_ptr, info_ptr, &sig_bit); |
| 1409 |
|
|
png_set_shift(png_ptr, sig_bit); |
| 1410 |
|
|
} |
| 1411 |
|
|
#endif |
| 1412 |
|
|
|
| 1413 |
|
|
#if defined(PNG_READ_BGR_SUPPORTED) |
| 1414 |
|
|
/* Flip the RGB pixels to BGR (or RGBA to BGRA) |
| 1415 |
|
|
*/ |
| 1416 |
|
|
if (transforms & PNG_TRANSFORM_BGR) |
| 1417 |
|
|
png_set_bgr(png_ptr); |
| 1418 |
|
|
#endif |
| 1419 |
|
|
|
| 1420 |
|
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
| 1421 |
|
|
/* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) |
| 1422 |
|
|
*/ |
| 1423 |
|
|
if (transforms & PNG_TRANSFORM_SWAP_ALPHA) |
| 1424 |
|
|
png_set_swap_alpha(png_ptr); |
| 1425 |
|
|
#endif |
| 1426 |
|
|
|
| 1427 |
|
|
#if defined(PNG_READ_SWAP_SUPPORTED) |
| 1428 |
|
|
/* Swap bytes of 16 bit files to least significant byte first |
| 1429 |
|
|
*/ |
| 1430 |
|
|
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) |
| 1431 |
|
|
png_set_swap(png_ptr); |
| 1432 |
|
|
#endif |
| 1433 |
|
|
|
| 1434 |
|
|
/* We don't handle adding filler bytes */ |
| 1435 |
|
|
|
| 1436 |
|
|
/* Optional call to gamma correct and add the background to the palette |
| 1437 |
|
|
* and update info structure. REQUIRED if you are expecting libpng to |
| 1438 |
|
|
* update the palette for you (i.e., you selected such a transform above). |
| 1439 |
|
|
*/ |
| 1440 |
|
|
png_read_update_info(png_ptr, info_ptr); |
| 1441 |
|
|
|
| 1442 |
|
|
/* -------------- image transformations end here ------------------- */ |
| 1443 |
|
|
|
| 1444 |
|
|
#ifdef PNG_FREE_ME_SUPPORTED |
| 1445 |
|
|
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); |
| 1446 |
|
|
#endif |
| 1447 |
|
|
if (info_ptr->row_pointers == NULL) |
| 1448 |
|
|
{ |
| 1449 |
|
|
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, |
| 1450 |
|
|
info_ptr->height * png_sizeof(png_bytep)); |
| 1451 |
|
|
png_memset(info_ptr->row_pointers, 0, info_ptr->height |
| 1452 |
|
|
* png_sizeof(png_bytep)); |
| 1453 |
|
|
#ifdef PNG_FREE_ME_SUPPORTED |
| 1454 |
|
|
info_ptr->free_me |= PNG_FREE_ROWS; |
| 1455 |
|
|
#endif |
| 1456 |
|
|
for (row = 0; row < (int)info_ptr->height; row++) |
| 1457 |
|
|
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, |
| 1458 |
|
|
png_get_rowbytes(png_ptr, info_ptr)); |
| 1459 |
|
|
} |
| 1460 |
|
|
|
| 1461 |
|
|
png_read_image(png_ptr, info_ptr->row_pointers); |
| 1462 |
|
|
info_ptr->valid |= PNG_INFO_IDAT; |
| 1463 |
|
|
|
| 1464 |
|
|
/* Read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
| 1465 |
|
|
png_read_end(png_ptr, info_ptr); |
| 1466 |
|
|
|
| 1467 |
|
|
transforms = transforms; /* Quiet compiler warnings */ |
| 1468 |
|
|
params = params; |
| 1469 |
|
|
|
| 1470 |
|
|
} |
| 1471 |
|
|
#endif /* PNG_INFO_IMAGE_SUPPORTED */ |
| 1472 |
|
|
#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */ |
| 1473 |
|
|
#endif /* PNG_READ_SUPPORTED */ |
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