/* pngread.c - read a PNG file
*
- * libpng 1.2.6 - August 15, 2004
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.1 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
* This file contains routines that an application calls directly to
* read a PNG file or stream.
*/
-#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
#include "png.h"
+#ifdef PNG_READ_SUPPORTED
+#include "pngpriv.h"
+
/* Create a PNG structure for reading, and allocate any memory needed. */
png_structp PNGAPI
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
- warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
+ warn_fn, NULL, NULL, NULL));
}
-/* Alternate create PNG structure for reading, and allocate any memory needed. */
+/* Alternate create PNG structure for reading, and allocate any memory
+ * needed.
+ */
png_structp PNGAPI
png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
{
#endif /* PNG_USER_MEM_SUPPORTED */
+#ifdef PNG_SETJMP_SUPPORTED
+ volatile
+#endif
png_structp png_ptr;
+ volatile int png_cleanup_needed = 0;
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
int i;
- png_debug(1, "in png_create_read_struct\n");
+ png_debug(1, "in png_create_read_struct");
+
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
- (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
+ malloc_fn, mem_ptr);
#else
png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
#endif
if (png_ptr == NULL)
return (NULL);
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
- png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
- /* added at libpng-1.2.6 */
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
- png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
- png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+ /* Added at libpng-1.2.6 */
+#ifdef PNG_USER_LIMITS_SUPPORTED
+ png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
+ png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
+# ifdef PNG_USER_CHUNK_CACHE_MAX
+ /* Added at libpng-1.2.43 and 1.4.0 */
+ png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;
+# endif
+# ifdef PNG_SET_USER_CHUNK_MALLOC_MAX
+ /* Added at libpng-1.2.43 and 1.4.1 */
+ png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;
+# endif
#endif
#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then
+ encounter a png_error() will longjmp here. Since the jmpbuf is
+ then meaningless we abort instead of returning. */
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */
#endif
- {
- png_free(png_ptr, png_ptr->zbuf);
- png_ptr->zbuf=NULL;
-#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)png_ptr,
- (png_free_ptr)free_fn, (png_voidp)mem_ptr);
-#else
- png_destroy_struct((png_voidp)png_ptr);
-#endif
- return (NULL);
- }
+ PNG_ABORT();
#ifdef USE_FAR_KEYWORD
- png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
-#endif
+ png_memcpy(png_jmpbuf(png_ptr), jmpbuf, png_sizeof(jmp_buf));
#endif
+#endif /* PNG_SETJMP_SUPPORTED */
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
- i=0;
- do
- {
- if(user_png_ver[i] != png_libpng_ver[i])
- png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
- } while (png_libpng_ver[i++]);
-
- if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+ if (user_png_ver)
{
- /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
- * we must recompile any applications that use any older library version.
- * For versions after libpng 1.0, we will be compatible, so we need
- * only check the first digit.
- */
- if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
- (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
- (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
- {
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
- char msg[80];
- if (user_png_ver)
- {
- sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
- user_png_ver);
- png_warning(png_ptr, msg);
- }
- sprintf(msg, "Application is running with png.c from libpng-%.20s",
- png_libpng_ver);
- png_warning(png_ptr, msg);
+ i = 0;
+ do
+ {
+ if (user_png_ver[i] != png_libpng_ver[i])
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ } while (png_libpng_ver[i++]);
+ }
+ else
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+
+
+ if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+ {
+ /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+ * we must recompile any applications that use any older library version.
+ * For versions after libpng 1.0, we will be compatible, so we need
+ * only check the first digit.
+ */
+ if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+ (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+ (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+ {
+#ifdef PNG_STDIO_SUPPORTED
+ char msg[80];
+ if (user_png_ver)
+ {
+ png_snprintf(msg, 80,
+ "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ png_snprintf(msg, 80,
+ "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
#endif
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- png_ptr->flags=0;
+ png_ptr->flags = 0;
#endif
- png_error(png_ptr,
- "Incompatible libpng version in application and library");
- }
+ png_warning(png_ptr,
+ "Incompatible libpng version in application and library");
+
+ png_cleanup_needed = 1;
+ }
}
- /* initialize zbuf - compression buffer */
+ if (!png_cleanup_needed)
+ {
+ /* Initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
- png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)png_ptr->zbuf_size);
+ png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr,
+ png_ptr->zbuf_size);
+ if (png_ptr->zbuf == NULL)
+ png_cleanup_needed = 1;
+ }
png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
- switch (inflateInit(&png_ptr->zstream))
+ if (!png_cleanup_needed)
{
- case Z_OK: /* Do nothing */ break;
- case Z_MEM_ERROR:
- case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
- case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
- default: png_error(png_ptr, "Unknown zlib error");
- }
-
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
-
- png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
-
-#ifdef PNG_SETJMP_SUPPORTED
-/* Applications that neglect to set up their own setjmp() and then encounter
- a png_error() will longjmp here. Since the jmpbuf is then meaningless we
- abort instead of returning. */
-#ifdef USE_FAR_KEYWORD
- if (setjmp(jmpbuf))
- PNG_ABORT();
- png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
-#else
- if (setjmp(png_ptr->jmpbuf))
- PNG_ABORT();
-#endif
-#endif
- return (png_ptr);
-}
-
-/* Initialize PNG structure for reading, and allocate any memory needed.
- This interface is deprecated in favour of the png_create_read_struct(),
- and it will eventually disappear. */
-#undef png_read_init
-void PNGAPI
-png_read_init(png_structp png_ptr)
-{
- /* We only come here via pre-1.0.7-compiled applications */
- png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
-}
-
-void PNGAPI
-png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
- png_size_t png_struct_size, png_size_t png_info_size)
-{
- /* We only come here via pre-1.0.12-compiled applications */
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
- if(png_sizeof(png_struct) > png_struct_size ||
- png_sizeof(png_info) > png_info_size)
- {
- char msg[80];
- png_ptr->warning_fn=NULL;
- if (user_png_ver)
+ switch (inflateInit(&png_ptr->zstream))
{
- sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
- user_png_ver);
- png_warning(png_ptr, msg);
+ case Z_OK: /* Do nothing */ break;
+ case Z_MEM_ERROR:
+ case Z_STREAM_ERROR: png_warning(png_ptr, "zlib memory error");
+ png_cleanup_needed = 1; break;
+ case Z_VERSION_ERROR: png_warning(png_ptr, "zlib version error");
+ png_cleanup_needed = 1; break;
+ default: png_warning(png_ptr, "Unknown zlib error");
+ png_cleanup_needed = 1;
}
- sprintf(msg, "Application is running with png.c from libpng-%.20s",
- png_libpng_ver);
- png_warning(png_ptr, msg);
}
-#endif
- if(png_sizeof(png_struct) > png_struct_size)
- {
- png_ptr->error_fn=NULL;
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- png_ptr->flags=0;
-#endif
- png_error(png_ptr,
- "The png struct allocated by the application for reading is too small.");
- }
- if(png_sizeof(png_info) > png_info_size)
- {
- png_ptr->error_fn=NULL;
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- png_ptr->flags=0;
-#endif
- png_error(png_ptr,
- "The info struct allocated by application for reading is too small.");
- }
- png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
-}
-void PNGAPI
-png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
- png_size_t png_struct_size)
-{
-#ifdef PNG_SETJMP_SUPPORTED
- jmp_buf tmp_jmp; /* to save current jump buffer */
-#endif
-
- int i=0;
-
- png_structp png_ptr=*ptr_ptr;
-
- do
+ if (png_cleanup_needed)
{
- if(user_png_ver[i] != png_libpng_ver[i])
- {
-#ifdef PNG_LEGACY_SUPPORTED
- png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ /* Clean up PNG structure and deallocate any memory. */
+ png_free(png_ptr, png_ptr->zbuf);
+ png_ptr->zbuf = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_destroy_struct_2((png_voidp)png_ptr,
+ (png_free_ptr)free_fn, (png_voidp)mem_ptr);
#else
- png_ptr->warning_fn=NULL;
- png_warning(png_ptr,
- "Application uses deprecated png_read_init() and should be recompiled.");
- break;
-#endif
- }
- } while (png_libpng_ver[i++]);
-
- png_debug(1, "in png_read_init_3\n");
-
-#ifdef PNG_SETJMP_SUPPORTED
- /* save jump buffer and error functions */
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
-#endif
-
- if(png_sizeof(png_struct) > png_struct_size)
- {
- png_destroy_struct(png_ptr);
- *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
- png_ptr = *ptr_ptr;
- }
-
- /* reset all variables to 0 */
- png_memset(png_ptr, 0, png_sizeof (png_struct));
-
-#ifdef PNG_SETJMP_SUPPORTED
- /* restore jump buffer */
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
-#endif
-
- /* added at libpng-1.2.6 */
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
- png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
- png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+ png_destroy_struct((png_voidp)png_ptr);
#endif
-
- /* initialize zbuf - compression buffer */
- png_ptr->zbuf_size = PNG_ZBUF_SIZE;
- png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)png_ptr->zbuf_size);
- png_ptr->zstream.zalloc = png_zalloc;
- png_ptr->zstream.zfree = png_zfree;
- png_ptr->zstream.opaque = (voidpf)png_ptr;
-
- switch (inflateInit(&png_ptr->zstream))
- {
- case Z_OK: /* Do nothing */ break;
- case Z_MEM_ERROR:
- case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
- case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
- default: png_error(png_ptr, "Unknown zlib error");
+ return (NULL);
}
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
+ png_set_read_fn(png_ptr, NULL, NULL);
+
+
+ return (png_ptr);
}
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
/* Read the information before the actual image data. This has been
* changed in v0.90 to allow reading a file that already has the magic
* bytes read from the stream. You can tell libpng how many bytes have
void PNGAPI
png_read_info(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_read_info\n");
+ png_debug(1, "in png_read_info");
+
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
{
png_size_t num_checked = png_ptr->sig_bytes,
num_to_check = 8 - num_checked;
+#ifdef PNG_IO_STATE_SUPPORTED
+ png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE;
+#endif
+
png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
png_ptr->sig_bytes = 8;
png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
- for(;;)
+ for (;;)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IHDR;
PNG_IDAT;
PNG_IEND;
PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
PNG_bKGD;
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
PNG_cHRM;
#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
PNG_gAMA;
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
PNG_hIST;
#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
PNG_iCCP;
#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
+#ifdef PNG_READ_iTXt_SUPPORTED
PNG_iTXt;
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
PNG_oFFs;
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#ifdef PNG_READ_pCAL_SUPPORTED
PNG_pCAL;
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
PNG_pHYs;
#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
PNG_sBIT;
#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
+#ifdef PNG_READ_sCAL_SUPPORTED
PNG_sCAL;
#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
PNG_sPLT;
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
PNG_sRGB;
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
PNG_tEXt;
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
PNG_tIME;
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
PNG_tRNS;
#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
+#ifdef PNG_READ_zTXt_SUPPORTED
PNG_zTXt;
#endif
-#endif /* PNG_GLOBAL_ARRAYS */
- png_byte chunk_length[4];
- png_uint_32 length;
-
- png_read_data(png_ptr, chunk_length, 4);
- length = png_get_uint_31(png_ptr,chunk_length);
-
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-
- png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
- length);
+ png_uint_32 length = png_read_chunk_header(png_ptr);
+ PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
/* This should be a binary subdivision search or a hash for
* matching the chunk name rather than a linear search.
*/
- if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+ if (!png_memcmp(chunk_name, png_IDAT, 4))
+ if (png_ptr->mode & PNG_AFTER_IDAT)
+ png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
+
+ if (!png_memcmp(chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ else if (!png_memcmp(chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ else if (png_handle_as_unknown(png_ptr, chunk_name))
{
- if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ if (!png_memcmp(chunk_name, png_IDAT, 4))
png_ptr->mode |= PNG_HAVE_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
- if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ if (!png_memcmp(chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
}
}
#endif
- else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ else if (!png_memcmp(chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
png_ptr->mode |= PNG_HAVE_IDAT;
break;
}
-#if defined(PNG_READ_bKGD_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+#ifdef PNG_READ_bKGD_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+#ifdef PNG_READ_cHRM_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_cHRM, 4))
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+#ifdef PNG_READ_gAMA_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_gAMA, 4))
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+#ifdef PNG_READ_hIST_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_hIST, 4))
png_handle_hIST(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+#ifdef PNG_READ_oFFs_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_oFFs, 4))
png_handle_oFFs(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+#ifdef PNG_READ_pCAL_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+#ifdef PNG_READ_sCAL_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sCAL, 4))
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+#ifdef PNG_READ_pHYs_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+#ifdef PNG_READ_sBIT_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sBIT, 4))
png_handle_sBIT(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+#ifdef PNG_READ_sRGB_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+#ifdef PNG_READ_iCCP_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_iCCP, 4))
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+#ifdef PNG_READ_sPLT_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sPLT, 4))
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+#ifdef PNG_READ_tEXt_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+#ifdef PNG_READ_tIME_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_tIME, 4))
png_handle_tIME(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+#ifdef PNG_READ_tRNS_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_tRNS, 4))
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+#ifdef PNG_READ_zTXt_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+#ifdef PNG_READ_iTXt_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
}
}
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-/* optional call to update the users info_ptr structure */
+/* Optional call to update the users info_ptr structure */
void PNGAPI
png_read_update_info(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_read_update_info\n");
+ png_debug(1, "in png_read_update_info");
+
+ if (png_ptr == NULL)
+ return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
else
png_warning(png_ptr,
"Ignoring extra png_read_update_info() call; row buffer not reallocated");
+
png_read_transform_info(png_ptr, info_ptr);
}
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
/* Initialize palette, background, etc, after transformations
* are set, but before any reading takes place. This allows
* the user to obtain a gamma-corrected palette, for example.
void PNGAPI
png_start_read_image(png_structp png_ptr)
{
- png_debug(1, "in png_start_read_image\n");
+ png_debug(1, "in png_start_read_image");
+
+ if (png_ptr == NULL)
+ return;
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
}
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
void PNGAPI
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
- const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
- const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
-#endif
+ PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
+ 0xff};
+ PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
int ret;
- png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
- png_ptr->row_number, png_ptr->pass);
+
+ if (png_ptr == NULL)
+ return;
+
+ png_debug2(1, "in png_read_row (row %lu, pass %d)",
+ (unsigned long) png_ptr->row_number, png_ptr->pass);
+
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
- /* check for transforms that have been set but were defined out */
+ /* Check for transforms that have been set but were defined out */
#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
- png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined");
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & PNG_FILLER)
- png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined");
#endif
-#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
+ !defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
- png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined");
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK)
- png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined");
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
- png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined");
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
if (png_ptr->transformations & PNG_BGR)
- png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined");
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
- png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
+ png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined");
#endif
}
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
- /* if interlaced and we do not need a new row, combine row and return */
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+ /* If interlaced and we do not need a new row, combine row and return */
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
switch (png_ptr->pass)
png_error(png_ptr, "Invalid attempt to read row data");
png_ptr->zstream.next_out = png_ptr->row_buf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
+ png_ptr->zstream.avail_out =
+ (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth,
+ png_ptr->iwidth) + 1);
do
{
if (!(png_ptr->zstream.avail_in))
{
while (!png_ptr->idat_size)
{
- png_byte chunk_length[4];
-
png_crc_finish(png_ptr, 0);
- png_read_data(png_ptr, chunk_length, 4);
- png_ptr->idat_size = png_get_uint_31(png_ptr,chunk_length);
-
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+ png_ptr->idat_size = png_read_chunk_header(png_ptr);
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
}
{
if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
png_ptr->idat_size)
- png_error(png_ptr, "Extra compressed data");
+ png_benign_error(png_ptr, "Extra compressed data");
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
png_ptr->row_info.width);
- if(png_ptr->row_buf[0])
+ if (png_ptr->row_buf[0])
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
- png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
- png_ptr->rowbytes + 1);
-
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
- if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+ if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
{
/* Intrapixel differencing */
}
#endif
- if (png_ptr->transformations)
+
+ if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
png_do_read_transformations(png_ptr);
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
- /* blow up interlaced rows to full size */
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+ /* Blow up interlaced rows to full size */
if (png_ptr->interlaced &&
(png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
-/* old interface (pre-1.0.9):
- png_do_read_interlace(&(png_ptr->row_info),
- png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
- */
+ /* Old interface (pre-1.0.9):
+ * png_do_read_interlace(&(png_ptr->row_info),
+ * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
png_do_read_interlace(png_ptr);
if (dsp_row != NULL)
if (png_ptr->read_row_fn != NULL)
(*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
}
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
/* Read one or more rows of image data. If the image is interlaced,
* and png_set_interlace_handling() has been called, the rows need to
* contain the contents of the rows from the previous pass. If the
* not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it.
*
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.6
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
*/
void PNGAPI
png_bytepp rp;
png_bytepp dp;
- png_debug(1, "in png_read_rows\n");
+ png_debug(1, "in png_read_rows");
+
+ if (png_ptr == NULL)
+ return;
rp = row;
dp = display_row;
if (rp != NULL && dp != NULL)
png_read_row(png_ptr, rptr, dptr);
}
- else if(rp != NULL)
+ else if (rp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep rptr = *rp;
- png_read_row(png_ptr, rptr, png_bytep_NULL);
+ png_read_row(png_ptr, rptr, NULL);
rp++;
}
- else if(dp != NULL)
+ else if (dp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep dptr = *dp;
- png_read_row(png_ptr, png_bytep_NULL, dptr);
+ png_read_row(png_ptr, NULL, dptr);
dp++;
}
}
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
/* Read the entire image. If the image has an alpha channel or a tRNS
* chunk, and you have called png_handle_alpha()[*], you will need to
* initialize the image to the current image that PNG will be overlaying.
* only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead.
*
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.6
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
*/
void PNGAPI
png_read_image(png_structp png_ptr, png_bytepp image)
{
- png_uint_32 i,image_height;
+ png_uint_32 i, image_height;
int pass, j;
png_bytepp rp;
- png_debug(1, "in png_read_image\n");
+ png_debug(1, "in png_read_image");
+
+ if (png_ptr == NULL)
+ return;
#ifdef PNG_READ_INTERLACING_SUPPORTED
pass = png_set_interlace_handling(png_ptr);
#else
if (png_ptr->interlaced)
png_error(png_ptr,
- "Cannot read interlaced image -- interlace handler disabled.");
+ "Cannot read interlaced image -- interlace handler disabled");
pass = 1;
#endif
rp = image;
for (i = 0; i < image_height; i++)
{
- png_read_row(png_ptr, *rp, png_bytep_NULL);
+ png_read_row(png_ptr, *rp, NULL);
rp++;
}
}
}
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
/* Read the end of the PNG file. Will not read past the end of the
* file, will verify the end is accurate, and will read any comments
* or time information at the end of the file, if info is not NULL.
void PNGAPI
png_read_end(png_structp png_ptr, png_infop info_ptr)
{
- png_byte chunk_length[4];
- png_uint_32 length;
-
- png_debug(1, "in png_read_end\n");
+ png_debug(1, "in png_read_end");
+
+ if (png_ptr == NULL)
+ return;
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
do
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IHDR;
PNG_IDAT;
PNG_IEND;
PNG_PLTE;
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
PNG_bKGD;
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
PNG_cHRM;
#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
PNG_gAMA;
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
PNG_hIST;
#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
PNG_iCCP;
#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
+#ifdef PNG_READ_iTXt_SUPPORTED
PNG_iTXt;
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
PNG_oFFs;
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#ifdef PNG_READ_pCAL_SUPPORTED
PNG_pCAL;
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
PNG_pHYs;
#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
PNG_sBIT;
#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
+#ifdef PNG_READ_sCAL_SUPPORTED
PNG_sCAL;
#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
PNG_sPLT;
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
PNG_sRGB;
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
PNG_tEXt;
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
PNG_tIME;
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
PNG_tRNS;
#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
+#ifdef PNG_READ_zTXt_SUPPORTED
PNG_zTXt;
#endif
-#endif /* PNG_GLOBAL_ARRAYS */
-
- png_read_data(png_ptr, chunk_length, 4);
- length = png_get_uint_31(png_ptr,chunk_length);
+ png_uint_32 length = png_read_chunk_header(png_ptr);
+ PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-
- png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
-
- if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
+ if (!png_memcmp(chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ else if (!png_memcmp(chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
- else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ else if (png_handle_as_unknown(png_ptr, chunk_name))
{
- if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ if (!png_memcmp(chunk_name, png_IDAT, 4))
{
- if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
- png_error(png_ptr, "Too many IDAT's found");
+ if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+ png_benign_error(png_ptr, "Too many IDATs found");
}
- else
- png_ptr->mode |= PNG_AFTER_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
- if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ if (!png_memcmp(chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
}
#endif
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(chunk_name, png_IDAT, 4))
{
/* Zero length IDATs are legal after the last IDAT has been
* read, but not after other chunks have been read.
*/
- if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
- png_error(png_ptr, "Too many IDAT's found");
+ if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+ png_benign_error(png_ptr, "Too many IDATs found");
png_crc_finish(png_ptr, length);
}
- else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ else if (!png_memcmp(chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
-#if defined(PNG_READ_bKGD_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
+#ifdef PNG_READ_bKGD_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
+#ifdef PNG_READ_cHRM_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_cHRM, 4))
png_handle_cHRM(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
+#ifdef PNG_READ_gAMA_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_gAMA, 4))
png_handle_gAMA(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
+#ifdef PNG_READ_hIST_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_hIST, 4))
png_handle_hIST(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
+#ifdef PNG_READ_oFFs_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_oFFs, 4))
png_handle_oFFs(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
+#ifdef PNG_READ_pCAL_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+#ifdef PNG_READ_sCAL_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sCAL, 4))
png_handle_sCAL(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
+#ifdef PNG_READ_pHYs_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
+#ifdef PNG_READ_sBIT_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sBIT, 4))
png_handle_sBIT(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
+#ifdef PNG_READ_sRGB_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_iCCP_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+#ifdef PNG_READ_iCCP_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_iCCP, 4))
png_handle_iCCP(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_sPLT_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+#ifdef PNG_READ_sPLT_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_sPLT, 4))
png_handle_sPLT(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
+#ifdef PNG_READ_tEXt_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
+#ifdef PNG_READ_tIME_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_tIME, 4))
png_handle_tIME(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
+#ifdef PNG_READ_tRNS_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_tRNS, 4))
png_handle_tRNS(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
+#ifdef PNG_READ_zTXt_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
- else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+#ifdef PNG_READ_iTXt_SUPPORTED
+ else if (!png_memcmp(chunk_name, png_iTXt, 4))
png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
} while (!(png_ptr->mode & PNG_HAVE_IEND));
}
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-/* free all memory used by the read */
+/* Free all memory used by the read */
void PNGAPI
png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
png_infopp end_info_ptr_ptr)
png_structp png_ptr = NULL;
png_infop info_ptr = NULL, end_info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
- png_free_ptr free_fn;
- png_voidp mem_ptr;
+ png_free_ptr free_fn = NULL;
+ png_voidp mem_ptr = NULL;
#endif
- png_debug(1, "in png_destroy_read_struct\n");
+ png_debug(1, "in png_destroy_read_struct");
+
if (png_ptr_ptr != NULL)
png_ptr = *png_ptr_ptr;
+ if (png_ptr == NULL)
+ return;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+ free_fn = png_ptr->free_fn;
+ mem_ptr = png_ptr->mem_ptr;
+#endif
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
if (end_info_ptr_ptr != NULL)
end_info_ptr = *end_info_ptr_ptr;
-#ifdef PNG_USER_MEM_SUPPORTED
- free_fn = png_ptr->free_fn;
- mem_ptr = png_ptr->mem_ptr;
-#endif
-
png_read_destroy(png_ptr, info_ptr, end_info_ptr);
if (info_ptr != NULL)
{
-#if defined(PNG_TEXT_SUPPORTED)
+#ifdef PNG_TEXT_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
#endif
if (end_info_ptr != NULL)
{
-#if defined(PNG_READ_TEXT_SUPPORTED)
+#ifdef PNG_READ_TEXT_SUPPORTED
png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
}
}
-/* free all memory used by the read (old method) */
+/* Free all memory used by the read (old method) */
void /* PRIVATE */
-png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
+png_read_destroy(png_structp png_ptr, png_infop info_ptr,
+ png_infop end_info_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp;
png_free_ptr free_fn;
#endif
- png_debug(1, "in png_read_destroy\n");
+ png_debug(1, "in png_read_destroy");
+
if (info_ptr != NULL)
png_info_destroy(png_ptr, info_ptr);
png_free(png_ptr, png_ptr->zbuf);
png_free(png_ptr, png_ptr->big_row_buf);
png_free(png_ptr, png_ptr->prev_row);
-#if defined(PNG_READ_DITHER_SUPPORTED)
+ png_free(png_ptr, png_ptr->chunkdata);
+#ifdef PNG_READ_QUANTIZE_SUPPORTED
png_free(png_ptr, png_ptr->palette_lookup);
- png_free(png_ptr, png_ptr->dither_index);
+ png_free(png_ptr, png_ptr->quantize_index);
#endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
png_free(png_ptr, png_ptr->gamma_table);
#endif
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
png_free(png_ptr, png_ptr->gamma_from_1);
png_free(png_ptr, png_ptr->gamma_to_1);
#endif
-#ifdef PNG_FREE_ME_SUPPORTED
if (png_ptr->free_me & PNG_FREE_PLTE)
png_zfree(png_ptr, png_ptr->palette);
png_ptr->free_me &= ~PNG_FREE_PLTE;
-#else
- if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
- png_zfree(png_ptr, png_ptr->palette);
- png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
-#endif
#if defined(PNG_tRNS_SUPPORTED) || \
defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-#ifdef PNG_FREE_ME_SUPPORTED
if (png_ptr->free_me & PNG_FREE_TRNS)
- png_free(png_ptr, png_ptr->trans);
+ png_free(png_ptr, png_ptr->trans_alpha);
png_ptr->free_me &= ~PNG_FREE_TRNS;
-#else
- if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
- png_free(png_ptr, png_ptr->trans);
- png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
-#endif
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-#ifdef PNG_FREE_ME_SUPPORTED
+#ifdef PNG_READ_hIST_SUPPORTED
if (png_ptr->free_me & PNG_FREE_HIST)
png_free(png_ptr, png_ptr->hist);
png_ptr->free_me &= ~PNG_FREE_HIST;
-#else
- if (png_ptr->flags & PNG_FLAG_FREE_HIST)
- png_free(png_ptr, png_ptr->hist);
- png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
-#endif
#endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
if (png_ptr->gamma_16_table != NULL)
{
int i;
}
png_free(png_ptr, png_ptr->gamma_16_table);
}
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
if (png_ptr->gamma_16_from_1 != NULL)
{
int i;
}
#endif
#endif
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
+#ifdef PNG_TIME_RFC1123_SUPPORTED
png_free(png_ptr, png_ptr->time_buffer);
#endif
* being used again.
*/
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
+ png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
#endif
error_fn = png_ptr->error_fn;
free_fn = png_ptr->free_fn;
#endif
- png_memset(png_ptr, 0, png_sizeof (png_struct));
+ png_memset(png_ptr, 0, png_sizeof(png_struct));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
- png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
+ png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
#endif
}
void PNGAPI
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
+ if (png_ptr == NULL)
+ return;
png_ptr->read_row_fn = read_row_fn;
}
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+#ifdef PNG_INFO_IMAGE_SUPPORTED
void PNGAPI
png_read_png(png_structp png_ptr, png_infop info_ptr,
int transforms,
{
int row;
-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
- /* invert the alpha channel from opacity to transparency
- */
- if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
- png_set_invert_alpha(png_ptr);
-#endif
+ if (png_ptr == NULL)
+ return;
/* png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk).
*/
png_read_info(png_ptr, info_ptr);
if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
- png_error(png_ptr,"Image is too high to process with png_read_png()");
+ png_error(png_ptr, "Image is too high to process with png_read_png()");
/* -------------- image transformations start here ------------------- */
-#if defined(PNG_READ_16_TO_8_SUPPORTED)
- /* tell libpng to strip 16 bit/color files down to 8 bits per color
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+ /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
*/
if (transforms & PNG_TRANSFORM_STRIP_16)
- png_set_strip_16(png_ptr);
+ png_set_strip_16(png_ptr);
#endif
-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
/* Strip alpha bytes from the input data without combining with
* the background (not recommended).
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
- png_set_strip_alpha(png_ptr);
+ png_set_strip_alpha(png_ptr);
#endif
#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
- png_set_packing(png_ptr);
+ png_set_packing(png_ptr);
#endif
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
/* Change the order of packed pixels to least significant bit first
* (not useful if you are using png_set_packing).
*/
if (transforms & PNG_TRANSFORM_PACKSWAP)
- png_set_packswap(png_ptr);
+ png_set_packswap(png_ptr);
#endif
-#if defined(PNG_READ_EXPAND_SUPPORTED)
+#ifdef PNG_READ_EXPAND_SUPPORTED
/* Expand paletted colors into true RGB triplets
* Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
* Expand paletted or RGB images with transparency to full alpha
* channels so the data will be available as RGBA quartets.
*/
if (transforms & PNG_TRANSFORM_EXPAND)
- if ((png_ptr->bit_depth < 8) ||
- (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
- (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+ if ((png_ptr->bit_depth < 8) ||
+ (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+ (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
png_set_expand(png_ptr);
#endif
- /* We don't handle background color or gamma transformation or dithering.
+ /* We don't handle background color or gamma transformation or quantizing.
*/
-#if defined(PNG_READ_INVERT_SUPPORTED)
- /* invert monochrome files to have 0 as white and 1 as black
+#ifdef PNG_READ_INVERT_SUPPORTED
+ /* Invert monochrome files to have 0 as white and 1 as black
*/
if (transforms & PNG_TRANSFORM_INVERT_MONO)
- png_set_invert_mono(png_ptr);
+ png_set_invert_mono(png_ptr);
#endif
-#if defined(PNG_READ_SHIFT_SUPPORTED)
+#ifdef PNG_READ_SHIFT_SUPPORTED
/* If you want to shift the pixel values from the range [0,255] or
* [0,65535] to the original [0,7] or [0,31], or whatever range the
* colors were originally in:
}
#endif
-#if defined(PNG_READ_BGR_SUPPORTED)
- /* flip the RGB pixels to BGR (or RGBA to BGRA)
+#ifdef PNG_READ_BGR_SUPPORTED
+ /* Flip the RGB pixels to BGR (or RGBA to BGRA)
*/
if (transforms & PNG_TRANSFORM_BGR)
- png_set_bgr(png_ptr);
+ png_set_bgr(png_ptr);
#endif
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
- /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
+#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
+ /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
*/
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
-#if defined(PNG_READ_SWAP_SUPPORTED)
- /* swap bytes of 16 bit files to least significant byte first
+#ifdef PNG_READ_SWAP_SUPPORTED
+ /* Swap bytes of 16 bit files to least significant byte first
*/
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
- png_set_swap(png_ptr);
+ png_set_swap(png_ptr);
+#endif
+
+/* Added at libpng-1.2.41 */
+#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
+ /* Invert the alpha channel from opacity to transparency
+ */
+ if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+ png_set_invert_alpha(png_ptr);
+#endif
+
+/* Added at libpng-1.2.41 */
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+ /* Expand grayscale image to RGB
+ */
+ if (transforms & PNG_TRANSFORM_GRAY_TO_RGB)
+ png_set_gray_to_rgb(png_ptr);
#endif
/* We don't handle adding filler bytes */
/* -------------- image transformations end here ------------------- */
-#ifdef PNG_FREE_ME_SUPPORTED
png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
-#endif
- if(info_ptr->row_pointers == NULL)
+ if (info_ptr->row_pointers == NULL)
{
+ png_uint_32 iptr;
+
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
info_ptr->height * png_sizeof(png_bytep));
-#ifdef PNG_FREE_ME_SUPPORTED
+ for (iptr=0; iptr<info_ptr->height; iptr++)
+ info_ptr->row_pointers[iptr] = NULL;
+
info_ptr->free_me |= PNG_FREE_ROWS;
-#endif
+
for (row = 0; row < (int)info_ptr->height; row++)
- {
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
png_get_rowbytes(png_ptr, info_ptr));
- }
}
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
- /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+ /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
- if(transforms == 0 || params == NULL)
- /* quiet compiler warnings */ return;
+ transforms = transforms; /* Quiet compiler warnings */
+ params = params;
}
-#endif
-#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_INFO_IMAGE_SUPPORTED */
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED */
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