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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
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if (png_sizeof(png_struct) > png_struct_size)
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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
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png_error(png_ptr,
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"The png struct allocated by the application for reading is too small.");
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}
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if (png_sizeof(png_info) > png_info_size)
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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
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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);
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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
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int i = 0;
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png_structp png_ptr=*ptr_ptr;
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if (png_ptr == NULL)
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return;
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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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{
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#ifdef PNG_LEGACY_SUPPORTED
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png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
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#else
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png_ptr->warning_fn = NULL;
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png_warning(png_ptr,
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"Application uses deprecated png_read_init() and should be recompiled.");
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break;
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#endif
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}
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} while (png_libpng_ver[i++]);
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png_debug(1, "in png_read_init_3");
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#ifdef PNG_SETJMP_SUPPORTED
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/* Save jump buffer and error functions */
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png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
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#endif
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if (png_sizeof(png_struct) > png_struct_size)
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{
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png_destroy_struct(png_ptr);
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*ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
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png_ptr = *ptr_ptr;
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}
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/* Reset all variables to 0 */
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png_memset(png_ptr, 0, png_sizeof(png_struct));
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#ifdef PNG_SETJMP_SUPPORTED
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/* Restore jump buffer */
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png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
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#endif
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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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/* 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"); break;
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case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); 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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}
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#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
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/* Read the information before the actual image data. This has been
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* changed in v0.90 to allow reading a file that already has the magic
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* bytes read from the stream. You can tell libpng how many bytes have
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* been read from the beginning of the stream (up to the maximum of 8)
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* via png_set_sig_bytes(), and we will only check the remaining bytes
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* here. The application can then have access to the signature bytes we
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* read if it is determined that this isn't a valid PNG file.
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330 |
*/
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331 |
void PNGAPI
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332 |
png_read_info(png_structp png_ptr, png_infop info_ptr)
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333 |
{
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334 |
if (png_ptr == NULL || info_ptr == NULL)
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335 |
return;
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336 |
png_debug(1, "in png_read_info");
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|
337 |
/* If we haven't checked all of the PNG signature bytes, do so now. */
|
|
|
338 |
if (png_ptr->sig_bytes < 8)
|
|
|
339 |
{
|
|
|
340 |
png_size_t num_checked = png_ptr->sig_bytes,
|
|
|
341 |
num_to_check = 8 - num_checked;
|
|
|
342 |
|
|
|
343 |
png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
|
|
|
344 |
png_ptr->sig_bytes = 8;
|
|
|
345 |
|
|
|
346 |
if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
|
|
|
347 |
{
|
|
|
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 |
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 |
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 |
if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
|
|
|
1340 |
png_error(png_ptr, "Image is too high to process with png_read_png()");
|
|
|
1341 |
|
|
|
1342 |
/* -------------- image transformations start here ------------------- */
|
|
|
1343 |
|
|
|
1344 |
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
|
1345 |
/* Tell libpng to strip 16 bit/color files down to 8 bits per color.
|
|
|
1346 |
*/
|
|
|
1347 |
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 */
|