/* pngrutil.c - utilities to read a PNG file
*
- * Last changed in libpng 1.2.34 [December 18, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.4 [August 26, 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 are only called from within
* libpng itself during the course of reading an image.
*/
-#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
#include "png.h"
-#if defined(PNG_READ_SUPPORTED)
-
-#if defined(_WIN32_WCE) && (_WIN32_WCE<0x500)
-# define WIN32_WCE_OLD
-#endif
+#ifdef PNG_READ_SUPPORTED
+#include "pngpriv.h"
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-# if defined(WIN32_WCE_OLD)
-/* strtod() function is not supported on WindowsCE */
-__inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr, char **endptr)
-{
- double result = 0;
- int len;
- wchar_t *str, *end;
-
- len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
- str = (wchar_t *)png_malloc(png_ptr, len * png_sizeof(wchar_t));
- if ( NULL != str )
- {
- MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
- result = wcstod(str, &end);
- len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
- *endptr = (char *)nptr + (png_strlen(nptr) - len + 1);
- png_free(png_ptr, str);
- }
- return result;
-}
-# else
# define png_strtod(p,a,b) strtod(a,b)
-# endif
-#endif
-
png_uint_32 PNGAPI
png_get_uint_31(png_structp png_ptr, png_bytep buf)
{
-#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
png_uint_32 i = png_get_uint_32(buf);
-#else
- /* Avoid an extra function call by inlining the result. */
- png_uint_32 i = ((png_uint_32)(*buf) << 24) +
- ((png_uint_32)(*(buf + 1)) << 16) +
- ((png_uint_32)(*(buf + 2)) << 8) +
- (png_uint_32)(*(buf + 3));
-#endif
if (i > PNG_UINT_31_MAX)
- png_error(png_ptr, "PNG unsigned integer out of range.");
+ png_error(png_ptr, "PNG unsigned integer out of range");
return (i);
}
-#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
+#ifndef PNG_USE_READ_MACROS
/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
-png_uint_32 PNGAPI
-png_get_uint_32(png_bytep buf)
+png_uint_32 (PNGAPI
+png_get_uint_32)(png_bytep buf)
{
- png_uint_32 i = ((png_uint_32)(*buf) << 24) +
- ((png_uint_32)(*(buf + 1)) << 16) +
- ((png_uint_32)(*(buf + 2)) << 8) +
- (png_uint_32)(*(buf + 3));
+ png_uint_32 i =
+ ((png_uint_32)(*(buf )) << 24) +
+ ((png_uint_32)(*(buf + 1)) << 16) +
+ ((png_uint_32)(*(buf + 2)) << 8) +
+ ((png_uint_32)(*(buf + 3)) ) ;
return (i);
}
/* Grab a signed 32-bit integer from a buffer in big-endian format. The
- * data is stored in the PNG file in two's complement format, and it is
- * assumed that the machine format for signed integers is the same. */
-png_int_32 PNGAPI
-png_get_int_32(png_bytep buf)
+ * data is stored in the PNG file in two's complement format and there
+ * is no guarantee that a 'png_int_32' is exactly 32 bits, therefore
+ * the following code does a two's complement to native conversion.
+ */
+png_int_32 (PNGAPI
+png_get_int_32)(png_bytep buf)
{
- png_int_32 i = ((png_int_32)(*buf) << 24) +
- ((png_int_32)(*(buf + 1)) << 16) +
- ((png_int_32)(*(buf + 2)) << 8) +
- (png_int_32)(*(buf + 3));
+ png_uint_32 u = png_get_uint_32(buf);
+ if ((u & 0x80000000) == 0) /* non-negative */
+ return u;
- return (i);
+ u = (u ^ 0xffffffff) + 1; /* 2's complement: -x = ~x+1 */
+ return -(png_int_32)u;
}
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
-png_uint_16 PNGAPI
-png_get_uint_16(png_bytep buf)
+png_uint_16 (PNGAPI
+png_get_uint_16)(png_bytep buf)
{
- png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
- (png_uint_16)(*(buf + 1)));
+ png_uint_16 i =
+ ((png_uint_32)(*buf) << 8) +
+ ((png_uint_32)(*(buf + 1)));
return (i);
}
-#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
+#endif /* PNG_USE_READ_MACROS */
/* Read the chunk header (length + type name).
* Put the type name into png_ptr->chunk_name, and return the length.
png_byte buf[8];
png_uint_32 length;
- /* read the length and the chunk name */
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that the chunk header is being read.
+ * PNG_IO_CHUNK_HDR requires a single I/O call.
+ */
+ png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_HDR;
+#endif
+
+ /* Read the length and the chunk name */
png_read_data(png_ptr, buf, 8);
length = png_get_uint_31(png_ptr, buf);
- /* put the chunk name into png_ptr->chunk_name */
+ /* Put the chunk name into png_ptr->chunk_name */
png_memcpy(png_ptr->chunk_name, buf + 4, 4);
png_debug2(0, "Reading %s chunk, length = %lu",
png_ptr->chunk_name, length);
- /* reset the crc and run it over the chunk name */
+ /* Reset the crc and run it over the chunk name */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
- /* check to see if chunk name is valid */
+ /* Check to see if chunk name is valid */
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that chunk data will (possibly) be read.
+ * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls.
+ */
+ png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA;
+#endif
+
return length;
}
void /* PRIVATE */
png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
{
- if (png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
png_read_data(png_ptr, buf, length);
png_calculate_crc(png_ptr, buf, length);
}
/* Optionally skip data and then check the CRC. Depending on whether we
- are reading a ancillary or critical chunk, and how the program has set
- things up, we may calculate the CRC on the data and print a message.
- Returns '1' if there was a CRC error, '0' otherwise. */
+ * are reading a ancillary or critical chunk, and how the program has set
+ * things up, we may calculate the CRC on the data and print a message.
+ * Returns '1' if there was a CRC error, '0' otherwise.
+ */
int /* PRIVATE */
png_crc_finish(png_structp png_ptr, png_uint_32 skip)
{
if (png_crc_error(png_ptr))
{
if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
- !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
+ !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
(!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
(png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
{
}
else
{
- png_chunk_error(png_ptr, "CRC error");
+ png_chunk_benign_error(png_ptr, "CRC error");
+ return (0);
}
return (1);
}
}
/* Compare the CRC stored in the PNG file with that calculated by libpng from
- the data it has read thus far. */
+ * the data it has read thus far.
+ */
int /* PRIVATE */
png_crc_error(png_structp png_ptr)
{
need_crc = 0;
}
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that the chunk CRC is being read */
+ /* PNG_IO_CHUNK_CRC requires the I/O to be done at once */
+ png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_CRC;
+#endif
+
png_read_data(png_ptr, crc_bytes, 4);
if (need_crc)
#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
defined(PNG_READ_iCCP_SUPPORTED)
-/*
- * Decompress trailing data in a chunk. The assumption is that chunkdata
- * points at an allocated area holding the contents of a chunk with a
- * trailing compressed part. What we get back is an allocated area
- * holding the original prefix part and an uncompressed version of the
- * trailing part (the malloc area passed in is freed).
- */
-void /* PRIVATE */
-png_decompress_chunk(png_structp png_ptr, int comp_type,
- png_size_t chunklength,
- png_size_t prefix_size, png_size_t *newlength)
+static png_size_t
+png_inflate(png_structp png_ptr, const png_byte *data, png_size_t size,
+ png_bytep output, png_size_t output_size)
{
- static PNG_CONST char msg[] = "Error decoding compressed text";
- png_charp text;
- png_size_t text_size;
+ png_size_t count = 0;
+
+ png_ptr->zstream.next_in = (png_bytep)data; /* const_cast: VALID */
+ png_ptr->zstream.avail_in = size;
- if (comp_type == PNG_COMPRESSION_TYPE_BASE)
+ while (1)
{
- int ret = Z_OK;
- png_ptr->zstream.next_in = (png_bytep)(png_ptr->chunkdata + prefix_size);
- png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
+ int ret, avail;
+
+ /* Reset the output buffer each time round - we empty it
+ * after every inflate call.
+ */
png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ png_ptr->zstream.avail_out = png_ptr->zbuf_size;
- text_size = 0;
- text = NULL;
+ ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
+ avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out;
- while (png_ptr->zstream.avail_in)
+ /* First copy/count any new output - but only if we didn't
+ * get an error code.
+ */
+ if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0)
{
- ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
- if (ret != Z_OK && ret != Z_STREAM_END)
+ if (output != 0 && output_size > count)
{
- if (png_ptr->zstream.msg != NULL)
- png_warning(png_ptr, png_ptr->zstream.msg);
- else
- png_warning(png_ptr, msg);
- inflateReset(&png_ptr->zstream);
- png_ptr->zstream.avail_in = 0;
+ int copy = output_size - count;
+ if (avail < copy) copy = avail;
+ png_memcpy(output + count, png_ptr->zbuf, copy);
+ }
+ count += avail;
+ }
- if (text == NULL)
- {
- text_size = prefix_size + png_sizeof(msg) + 1;
- text = (png_charp)png_malloc_warn(png_ptr, text_size);
- if (text == NULL)
- {
- png_free(png_ptr, png_ptr->chunkdata);
- png_ptr->chunkdata = NULL;
- png_error(png_ptr, "Not enough memory to decompress chunk");
- }
- png_memcpy(text, png_ptr->chunkdata, prefix_size);
- }
+ if (ret == Z_OK)
+ continue;
- text[text_size - 1] = 0x00;
+ /* Termination conditions - always reset the zstream, it
+ * must be left in inflateInit state.
+ */
+ png_ptr->zstream.avail_in = 0;
+ inflateReset(&png_ptr->zstream);
- /* Copy what we can of the error message into the text chunk */
- text_size = (png_size_t)(chunklength -
- (text - png_ptr->chunkdata) - 1);
- if (text_size > png_sizeof(msg))
- text_size = png_sizeof(msg);
- png_memcpy(text + prefix_size, msg, text_size);
- break;
- }
- if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
+ if (ret == Z_STREAM_END)
+ return count; /* NOTE: may be zero. */
+
+ /* Now handle the error codes - the API always returns 0
+ * and the error message is dumped into the uncompressed
+ * buffer if available.
+ */
+ {
+ PNG_CONST char *msg;
+ if (png_ptr->zstream.msg != 0)
+ msg = png_ptr->zstream.msg;
+ else
{
- if (text == NULL)
- {
- text_size = prefix_size +
- png_ptr->zbuf_size - png_ptr->zstream.avail_out;
- text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
- if (text == NULL)
- {
- png_free(png_ptr, png_ptr->chunkdata);
- png_ptr->chunkdata = NULL;
- png_error(png_ptr,
- "Not enough memory to decompress chunk.");
- }
- png_memcpy(text + prefix_size, png_ptr->zbuf,
- text_size - prefix_size);
- png_memcpy(text, png_ptr->chunkdata, prefix_size);
- *(text + text_size) = 0x00;
- }
- else
- {
- png_charp tmp;
+#ifdef PNG_STDIO_SUPPORTED
+ char umsg[52];
- tmp = text;
- text = (png_charp)png_malloc_warn(png_ptr,
- (png_uint_32)(text_size +
- png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
- if (text == NULL)
- {
- png_free(png_ptr, tmp);
- png_free(png_ptr, png_ptr->chunkdata);
- png_ptr->chunkdata = NULL;
- png_error(png_ptr,
- "Not enough memory to decompress chunk..");
- }
- png_memcpy(text, tmp, text_size);
- png_free(png_ptr, tmp);
- png_memcpy(text + text_size, png_ptr->zbuf,
- (png_ptr->zbuf_size - png_ptr->zstream.avail_out));
- text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
- *(text + text_size) = 0x00;
- }
- if (ret == Z_STREAM_END)
- break;
- else
+ switch (ret)
{
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ case Z_BUF_ERROR:
+ msg = "Buffer error in compressed datastream in %s chunk";
+ break;
+ case Z_DATA_ERROR:
+ msg = "Data error in compressed datastream in %s chunk";
+ break;
+ default:
+ msg = "Incomplete compressed datastream in %s chunk";
+ break;
}
+
+ png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name);
+ msg = umsg;
+#else
+ msg = "Damaged compressed datastream in chunk other than IDAT";
+#endif
}
+
+ png_warning(png_ptr, msg);
}
- if (ret != Z_STREAM_END)
- {
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
- char umsg[52];
-
- if (ret == Z_BUF_ERROR)
- png_snprintf(umsg, 52,
- "Buffer error in compressed datastream in %s chunk",
- png_ptr->chunk_name);
- else if (ret == Z_DATA_ERROR)
- png_snprintf(umsg, 52,
- "Data error in compressed datastream in %s chunk",
- png_ptr->chunk_name);
- else
- png_snprintf(umsg, 52,
- "Incomplete compressed datastream in %s chunk",
- png_ptr->chunk_name);
- png_warning(png_ptr, umsg);
+
+ /* 0 means an error - notice that this code simple ignores
+ * zero length compressed chunks as a result.
+ */
+ return 0;
+ }
+}
+
+/*
+ * Decompress trailing data in a chunk. The assumption is that chunkdata
+ * points at an allocated area holding the contents of a chunk with a
+ * trailing compressed part. What we get back is an allocated area
+ * holding the original prefix part and an uncompressed version of the
+ * trailing part (the malloc area passed in is freed).
+ */
+void /* PRIVATE */
+png_decompress_chunk(png_structp png_ptr, int comp_type,
+ png_size_t chunklength,
+ png_size_t prefix_size, png_size_t *newlength)
+{
+ /* The caller should guarantee this */
+ if (prefix_size > chunklength)
+ {
+ /* The recovery is to delete the chunk. */
+ png_warning(png_ptr, "invalid chunklength");
+ prefix_size = 0; /* To delete everything */
+ }
+
+ else if (comp_type == PNG_COMPRESSION_TYPE_BASE)
+ {
+ png_size_t expanded_size = png_inflate(png_ptr,
+ (png_bytep)(png_ptr->chunkdata + prefix_size),
+ chunklength - prefix_size,
+ 0/*output*/, 0/*output size*/);
+
+ /* Now check the limits on this chunk - if the limit fails the
+ * compressed data will be removed, the prefix will remain.
+ */
+#ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
+ if (png_ptr->user_chunk_malloc_max &&
+ (prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1))
#else
- png_warning(png_ptr,
- "Incomplete compressed datastream in chunk other than IDAT");
+# ifdef PNG_USER_CHUNK_MALLOC_MAX
+ if ((PNG_USER_CHUNK_MALLOC_MAX > 0) &&
+ prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1)
+# endif
+#endif
+ png_warning(png_ptr, "Exceeded size limit while expanding chunk");
+
+ /* If the size is zero either there was an error and a message
+ * has already been output (warning) or the size really is zero
+ * and we have nothing to do - the code will exit through the
+ * error case below.
+ */
+#if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \
+ defined(PNG_USER_CHUNK_MALLOC_MAX)
+ else
#endif
- text_size = prefix_size;
- if (text == NULL)
+ if (expanded_size > 0)
+ {
+ /* Success (maybe) - really uncompress the chunk. */
+ png_size_t new_size = 0;
+ png_charp text = png_malloc_warn(png_ptr,
+ prefix_size + expanded_size + 1);
+
+ if (text != NULL)
{
- text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
- if (text == NULL)
- {
- png_free(png_ptr, png_ptr->chunkdata);
- png_ptr->chunkdata = NULL;
- png_error(png_ptr, "Not enough memory for text.");
- }
png_memcpy(text, png_ptr->chunkdata, prefix_size);
- }
- *(text + text_size) = 0x00;
- }
+ new_size = png_inflate(png_ptr,
+ (png_bytep)(png_ptr->chunkdata + prefix_size),
+ chunklength - prefix_size,
+ (png_bytep)(text + prefix_size), expanded_size);
+ text[prefix_size + expanded_size] = 0; /* just in case */
- inflateReset(&png_ptr->zstream);
- png_ptr->zstream.avail_in = 0;
+ if (new_size == expanded_size)
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = text;
+ *newlength = prefix_size + expanded_size;
+ return; /* The success return! */
+ }
- png_free(png_ptr, png_ptr->chunkdata);
- png_ptr->chunkdata = text;
- *newlength=text_size;
+ png_warning(png_ptr, "png_inflate logic error");
+ png_free(png_ptr, text);
+ }
+ else
+ png_warning(png_ptr, "Not enough memory to decompress chunk");
+ }
}
+
else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
{
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+#ifdef PNG_STDIO_SUPPORTED
char umsg[50];
- png_snprintf(umsg, 50, "Unknown zTXt compression type %d", comp_type);
+ png_snprintf(umsg, sizeof umsg, "Unknown zTXt compression type %d",
+ comp_type);
png_warning(png_ptr, umsg);
#else
png_warning(png_ptr, "Unknown zTXt compression type");
#endif
- *(png_ptr->chunkdata + prefix_size) = 0x00;
- *newlength = prefix_size;
+ /* The recovery is to simply drop the data. */
}
+
+ /* Generic error return - leave the prefix, delete the compressed
+ * data, reallocate the chunkdata to remove the potentially large
+ * amount of compressed data.
+ */
+ {
+ png_charp text = png_malloc_warn(png_ptr, prefix_size + 1);
+ if (text != NULL)
+ {
+ if (prefix_size > 0)
+ png_memcpy(text, png_ptr->chunkdata, prefix_size);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = text;
+
+ /* This is an extra zero in the 'uncompressed' part. */
+ *(png_ptr->chunkdata + prefix_size) = 0x00;
+ }
+ /* Ignore a malloc error here - it is safe. */
+ }
+
+ *newlength = prefix_size;
}
#endif
-/* read and check the IDHR chunk */
+/* Read and check the IDHR chunk */
void /* PRIVATE */
png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
if (png_ptr->mode & PNG_HAVE_IHDR)
png_error(png_ptr, "Out of place IHDR");
- /* check the length */
+ /* Check the length */
if (length != 13)
png_error(png_ptr, "Invalid IHDR chunk");
filter_type = buf[11];
interlace_type = buf[12];
- /* set internal variables */
+ /* Set internal variables */
png_ptr->width = width;
png_ptr->height = height;
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->interlaced = (png_byte)interlace_type;
png_ptr->color_type = (png_byte)color_type;
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED
png_ptr->filter_type = (png_byte)filter_type;
#endif
png_ptr->compression_type = (png_byte)compression_type;
- /* find number of channels */
+ /* Find number of channels */
switch (png_ptr->color_type)
{
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_PALETTE:
png_ptr->channels = 1;
break;
+
case PNG_COLOR_TYPE_RGB:
png_ptr->channels = 3;
break;
+
case PNG_COLOR_TYPE_GRAY_ALPHA:
png_ptr->channels = 2;
break;
+
case PNG_COLOR_TYPE_RGB_ALPHA:
png_ptr->channels = 4;
break;
}
- /* set up other useful info */
+ /* Set up other useful info */
png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
png_ptr->channels);
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
color_type, interlace_type, compression_type, filter_type);
}
-/* read and check the palette */
+/* Read and check the palette */
void /* PRIVATE */
png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_color palette[PNG_MAX_PALETTE_LENGTH];
int num, i;
-#ifndef PNG_NO_POINTER_INDEXING
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
png_colorp pal_ptr;
#endif
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before PLTE");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid PLTE after IDAT");
png_crc_finish(png_ptr, length);
return;
}
+
else if (png_ptr->mode & PNG_HAVE_PLTE)
png_error(png_ptr, "Duplicate PLTE chunk");
png_crc_finish(png_ptr, length);
return;
}
-#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
+#ifndef PNG_READ_OPT_PLTE_SUPPORTED
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
png_crc_finish(png_ptr, length);
png_crc_finish(png_ptr, length);
return;
}
+
else
{
png_error(png_ptr, "Invalid palette chunk");
num = (int)length / 3;
-#ifndef PNG_NO_POINTER_INDEXING
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
{
png_byte buf[3];
png_byte buf[3];
png_crc_read(png_ptr, buf, 3);
- /* don't depend upon png_color being any order */
+ /* Don't depend upon png_color being any order */
palette[i].red = buf[0];
palette[i].green = buf[1];
palette[i].blue = buf[2];
#endif
/* If we actually NEED the PLTE chunk (ie for a paletted image), we do
- whatever the normal CRC configuration tells us. However, if we
- have an RGB image, the PLTE can be considered ancillary, so
- we will act as though it is. */
-#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
+ * whatever the normal CRC configuration tells us. However, if we
+ * have an RGB image, the PLTE can be considered ancillary, so
+ * we will act as though it is.
+ */
+#ifndef PNG_READ_OPT_PLTE_SUPPORTED
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#endif
{
png_crc_finish(png_ptr, 0);
}
-#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
+#ifndef PNG_READ_OPT_PLTE_SUPPORTED
else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */
{
/* If we don't want to use the data from an ancillary chunk,
{
if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)
{
- png_chunk_error(png_ptr, "CRC error");
+ png_chunk_benign_error(png_ptr, "CRC error");
}
else
{
png_set_PLTE(png_ptr, info_ptr, palette, num);
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
}
png_crc_finish(png_ptr, length);
- info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
+ info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
}
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#ifdef PNG_READ_gAMA_SUPPORTED
void /* PRIVATE */
png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_warning(png_ptr, "Out of place gAMA chunk");
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
)
return;
igamma = (png_fixed_point)png_get_uint_32(buf);
- /* check for zero gamma */
+ /* Check for zero gamma */
if (igamma == 0)
{
png_warning(png_ptr,
return;
}
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
-#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_CONSOLE_IO_SUPPORTED
fprintf(stderr, "gamma = (%d/100000)", (int)igamma);
#endif
return;
}
#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#ifdef PNG_READ_sBIT_SUPPORTED
void /* PRIVATE */
png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
}
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#ifdef PNG_READ_cHRM_SUPPORTED
void /* PRIVATE */
png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_warning(png_ptr, "Missing PLTE before cHRM");
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
)
blue_y = (float)int_y_blue / (float)100000.0;
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
{
if (PNG_OUT_OF_RANGE(int_x_white, 31270, 1000) ||
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
-#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_CONSOLE_IO_SUPPORTED
#ifdef PNG_FLOATING_POINT_SUPPORTED
fprintf(stderr, "wx=%f, wy=%f, rx=%f, ry=%f\n",
white_x, white_y, red_x, red_y);
green_x, green_y, blue_x, blue_y);
#else
fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
- int_x_white, int_y_white, int_x_red, int_y_red);
+ (long)int_x_white, (long)int_y_white,
+ (long)int_x_red, (long)int_y_red);
fprintf(stderr, "gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
- int_x_green, int_y_green, int_x_blue, int_y_blue);
+ (long)int_x_green, (long)int_y_green,
+ (long)int_x_blue, (long)int_y_blue);
#endif
-#endif /* PNG_NO_CONSOLE_IO */
+#endif /* PNG_CONSOLE_IO_SUPPORTED */
}
return;
}
}
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#ifdef PNG_READ_sRGB_SUPPORTED
void /* PRIVATE */
png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
return;
intent = buf[0];
- /* check for bad intent */
+ /* Check for bad intent */
if (intent >= PNG_sRGB_INTENT_LAST)
{
png_warning(png_ptr, "Unknown sRGB intent");
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
-#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_CONSOLE_IO_SUPPORTED
# ifdef PNG_FIXED_POINT_SUPPORTED
fprintf(stderr, "incorrect gamma=(%d/100000)\n",
(int)png_ptr->int_gamma);
}
#endif /* PNG_READ_sRGB_SUPPORTED */
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#ifdef PNG_READ_iCCP_SUPPORTED
void /* PRIVATE */
png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Note: this does not properly handle chunks that are > 64K under DOS */
png_ptr->chunkdata[slength] = 0x00;
for (profile = png_ptr->chunkdata; *profile; profile++)
- /* empty loop to find end of name */ ;
+ /* Empty loop to find end of name */ ;
++profile;
- /* there should be at least one zero (the compression type byte)
- following the separator, and we should be on it */
+ /* There should be at least one zero (the compression type byte)
+ * following the separator, and we should be on it
+ */
if ( profile >= png_ptr->chunkdata + slength - 1)
{
png_free(png_ptr, png_ptr->chunkdata);
return;
}
- /* compression_type should always be zero */
+ /* Compression_type should always be zero */
compression_type = *profile++;
if (compression_type)
{
if (profile_size > profile_length)
{
+#ifdef PNG_STDIO_SUPPORTED
+ char umsg[50];
+#endif
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
- png_warning(png_ptr, "Ignoring truncated iCCP profile.");
+ png_warning(png_ptr, "Ignoring truncated iCCP profile");
+#ifdef PNG_STDIO_SUPPORTED
+
+ png_snprintf(umsg, 50, "declared profile size = %lu",
+ (unsigned long)profile_size);
+ png_warning(png_ptr, umsg);
+ png_snprintf(umsg, 50, "actual profile length = %lu",
+ (unsigned long)profile_length);
+ png_warning(png_ptr, umsg);
+#endif
return;
}
}
#endif /* PNG_READ_iCCP_SUPPORTED */
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#ifdef PNG_READ_sPLT_SUPPORTED
void /* PRIVATE */
png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Note: this does not properly handle chunks that are > 64K under DOS */
{
png_bytep entry_start;
png_sPLT_t new_palette;
-#ifdef PNG_NO_POINTER_INDEXING
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
png_sPLT_entryp pp;
#endif
int data_length, entry_size, i;
png_debug(1, "in png_handle_sPLT");
+#ifdef PNG_USER_LIMITS_SUPPORTED
+
+ if (png_ptr->user_chunk_cache_max != 0)
+ {
+ if (png_ptr->user_chunk_cache_max == 1)
+ {
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ if (--png_ptr->user_chunk_cache_max == 1)
+ {
+ png_warning(png_ptr, "No space in chunk cache for sPLT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ }
+#endif
+
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sPLT");
else if (png_ptr->mode & PNG_HAVE_IDAT)
png_ptr->chunkdata[slength] = 0x00;
- for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; entry_start++)
- /* empty loop to find end of name */ ;
+ for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start;
+ entry_start++)
+ /* Empty loop to find end of name */ ;
++entry_start;
- /* a sample depth should follow the separator, and we should be on it */
+ /* A sample depth should follow the separator, and we should be on it */
if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
{
png_free(png_ptr, png_ptr->chunkdata);
entry_size = (new_palette.depth == 8 ? 6 : 10);
data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
- /* integrity-check the data length */
+ /* Integrity-check the data length */
if (data_length % entry_size)
{
png_free(png_ptr, png_ptr->chunkdata);
return;
}
-#ifndef PNG_NO_POINTER_INDEXING
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (i = 0; i < new_palette.nentries; i++)
{
- png_sPLT_entryp pp = new_palette.entries + i;
+ pp = new_palette.entries + i;
if (new_palette.depth == 8)
{
}
#endif
- /* discard all chunk data except the name and stash that */
+ /* Discard all chunk data except the name and stash that */
new_palette.name = png_ptr->chunkdata;
png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
}
#endif /* PNG_READ_sPLT_SUPPORTED */
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#ifdef PNG_READ_tRNS_SUPPORTED
void /* PRIVATE */
png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_crc_read(png_ptr, buf, 2);
png_ptr->num_trans = 1;
- png_ptr->trans_values.gray = png_get_uint_16(buf);
+ png_ptr->trans_color.gray = png_get_uint_16(buf);
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
}
png_crc_read(png_ptr, buf, (png_size_t)length);
png_ptr->num_trans = 1;
- png_ptr->trans_values.red = png_get_uint_16(buf);
- png_ptr->trans_values.green = png_get_uint_16(buf + 2);
- png_ptr->trans_values.blue = png_get_uint_16(buf + 4);
+ png_ptr->trans_color.red = png_get_uint_16(buf);
+ png_ptr->trans_color.green = png_get_uint_16(buf + 2);
+ png_ptr->trans_color.blue = png_get_uint_16(buf + 4);
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
}
png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
- &(png_ptr->trans_values));
+ &(png_ptr->trans_color));
}
#endif
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#ifdef PNG_READ_bKGD_SUPPORTED
void /* PRIVATE */
png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
}
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_READ_hIST_SUPPORTED
void /* PRIVATE */
png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
}
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#ifdef PNG_READ_pHYs_SUPPORTED
void /* PRIVATE */
png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
}
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#ifdef PNG_READ_oFFs_SUPPORTED
void /* PRIVATE */
png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
}
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-/* read the pCAL chunk (described in the PNG Extensions document) */
+#ifdef PNG_READ_pCAL_SUPPORTED
+/* Read the pCAL chunk (described in the PNG Extensions document) */
void /* PRIVATE */
png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (png_ptr->chunkdata == NULL)
{
- png_warning(png_ptr, "No memory for pCAL purpose.");
+ png_warning(png_ptr, "No memory for pCAL purpose");
return;
}
slength = (png_size_t)length;
return;
}
- png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
+ png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
png_debug(3, "Finding end of pCAL purpose string");
for (buf = png_ptr->chunkdata; *buf; buf++)
- /* empty loop */ ;
+ /* Empty loop */ ;
endptr = png_ptr->chunkdata + slength;
png_debug(3, "Allocating pCAL parameters array");
params = (png_charpp)png_malloc_warn(png_ptr,
- (png_uint_32)(nparams * png_sizeof(png_charp))) ;
+ (png_size_t)(nparams * png_sizeof(png_charp)));
if (params == NULL)
{
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
- png_warning(png_ptr, "No memory for pCAL params.");
+ png_warning(png_ptr, "No memory for pCAL params");
return;
}
}
#endif
-#if defined(PNG_READ_sCAL_SUPPORTED)
-/* read the sCAL chunk */
+#ifdef PNG_READ_sCAL_SUPPORTED
+/* Read the sCAL chunk */
void /* PRIVATE */
png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
if (png_ptr->chunkdata == NULL)
{
png_warning(png_ptr, "Out of memory while processing sCAL chunk");
+ png_crc_finish(png_ptr, length);
return;
}
slength = (png_size_t)length;
return;
}
- png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
+ png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
- ep = png_ptr->chunkdata + 1; /* skip unit byte */
+ ep = png_ptr->chunkdata + 1; /* Skip unit byte */
#ifdef PNG_FLOATING_POINT_SUPPORTED
width = png_strtod(png_ptr, ep, &vp);
if (*vp)
{
png_warning(png_ptr, "malformed width string in sCAL chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
#else
if (swidth == NULL)
{
png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
- png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
+ png_memcpy(swidth, ep, png_strlen(ep));
#endif
#endif
for (ep = png_ptr->chunkdata; *ep; ep++)
- /* empty loop */ ;
+ /* Empty loop */ ;
ep++;
if (png_ptr->chunkdata + slength < ep)
{
png_warning(png_ptr, "Truncated sCAL chunk");
-#if defined(PNG_FIXED_POINT_SUPPORTED) && \
- !defined(PNG_FLOATING_POINT_SUPPORTED)
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, swidth);
#endif
png_free(png_ptr, png_ptr->chunkdata);
if (*vp)
{
png_warning(png_ptr, "malformed height string in sCAL chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
#else
if (sheight == NULL)
{
png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_free(png_ptr, swidth);
return;
}
- png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
+ png_memcpy(sheight, ep, png_strlen(ep));
#endif
#endif
}
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#ifdef PNG_READ_tIME_SUPPORTED
void /* PRIVATE */
png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
}
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED)
+#ifdef PNG_READ_tEXt_SUPPORTED
/* Note: this does not properly handle chunks that are > 64K under DOS */
void /* PRIVATE */
png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_debug(1, "in png_handle_tEXt");
+#ifdef PNG_USER_LIMITS_SUPPORTED
+ if (png_ptr->user_chunk_cache_max != 0)
+ {
+ if (png_ptr->user_chunk_cache_max == 1)
+ {
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ if (--png_ptr->user_chunk_cache_max == 1)
+ {
+ png_warning(png_ptr, "No space in chunk cache for tEXt");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ }
+#endif
+
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before tEXt");
#endif
png_free(png_ptr, png_ptr->chunkdata);
+
png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (png_ptr->chunkdata == NULL)
{
- png_warning(png_ptr, "No memory to process text chunk.");
+ png_warning(png_ptr, "No memory to process text chunk");
return;
}
slength = (png_size_t)length;
}
key = png_ptr->chunkdata;
+
key[slength] = 0x00;
for (text = key; *text; text++)
- /* empty loop to find end of key */ ;
+ /* Empty loop to find end of key */ ;
if (text != key + slength)
text++;
text_ptr = (png_textp)png_malloc_warn(png_ptr,
- (png_uint_32)png_sizeof(png_text));
+ png_sizeof(png_text));
if (text_ptr == NULL)
{
- png_warning(png_ptr, "Not enough memory to process text chunk.");
+ png_warning(png_ptr, "Not enough memory to process text chunk");
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
return;
png_ptr->chunkdata = NULL;
png_free(png_ptr, text_ptr);
if (ret)
- png_warning(png_ptr, "Insufficient memory to process text chunk.");
+ png_warning(png_ptr, "Insufficient memory to process text chunk");
}
#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-/* note: this does not correctly handle chunks that are > 64K under DOS */
+#ifdef PNG_READ_zTXt_SUPPORTED
+/* Note: this does not correctly handle chunks that are > 64K under DOS */
void /* PRIVATE */
png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t slength, prefix_len, data_len;
png_debug(1, "in png_handle_zTXt");
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+ if (png_ptr->user_chunk_cache_max != 0)
+ {
+ if (png_ptr->user_chunk_cache_max == 1)
+ {
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ if (--png_ptr->user_chunk_cache_max == 1)
+ {
+ png_warning(png_ptr, "No space in chunk cache for zTXt");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ }
+#endif
+
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before zTXt");
png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (png_ptr->chunkdata == NULL)
{
- png_warning(png_ptr, "Out of memory processing zTXt chunk.");
+ png_warning(png_ptr, "Out of memory processing zTXt chunk");
return;
}
slength = (png_size_t)length;
png_ptr->chunkdata[slength] = 0x00;
for (text = png_ptr->chunkdata; *text; text++)
- /* empty loop */ ;
+ /* Empty loop */ ;
/* zTXt must have some text after the chunkdataword */
if (text >= png_ptr->chunkdata + slength - 2)
png_warning(png_ptr, "Unknown compression type in zTXt chunk");
comp_type = PNG_TEXT_COMPRESSION_zTXt;
}
- text++; /* skip the compression_method byte */
+ text++; /* Skip the compression_method byte */
}
prefix_len = text - png_ptr->chunkdata;
(png_size_t)length, prefix_len, &data_len);
text_ptr = (png_textp)png_malloc_warn(png_ptr,
- (png_uint_32)png_sizeof(png_text));
+ png_sizeof(png_text));
if (text_ptr == NULL)
{
- png_warning(png_ptr, "Not enough memory to process zTXt chunk.");
+ png_warning(png_ptr, "Not enough memory to process zTXt chunk");
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
return;
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
if (ret)
- png_error(png_ptr, "Insufficient memory to store zTXt chunk.");
+ png_error(png_ptr, "Insufficient memory to store zTXt chunk");
}
#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-/* note: this does not correctly handle chunks that are > 64K under DOS */
+#ifdef PNG_READ_iTXt_SUPPORTED
+/* Note: this does not correctly handle chunks that are > 64K under DOS */
void /* PRIVATE */
png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_debug(1, "in png_handle_iTXt");
+#ifdef PNG_USER_LIMITS_SUPPORTED
+ if (png_ptr->user_chunk_cache_max != 0)
+ {
+ if (png_ptr->user_chunk_cache_max == 1)
+ {
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ if (--png_ptr->user_chunk_cache_max == 1)
+ {
+ png_warning(png_ptr, "No space in chunk cache for iTXt");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ }
+#endif
+
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before iTXt");
png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
if (png_ptr->chunkdata == NULL)
{
- png_warning(png_ptr, "No memory to process iTXt chunk.");
+ png_warning(png_ptr, "No memory to process iTXt chunk");
return;
}
slength = (png_size_t)length;
png_ptr->chunkdata[slength] = 0x00;
for (lang = png_ptr->chunkdata; *lang; lang++)
- /* empty loop */ ;
- lang++; /* skip NUL separator */
+ /* Empty loop */ ;
+ lang++; /* Skip NUL separator */
/* iTXt must have a language tag (possibly empty), two compression bytes,
- translated keyword (possibly empty), and possibly some text after the
- keyword */
+ * translated keyword (possibly empty), and possibly some text after the
+ * keyword
+ */
if (lang >= png_ptr->chunkdata + slength - 3)
{
}
for (lang_key = lang; *lang_key; lang_key++)
- /* empty loop */ ;
- lang_key++; /* skip NUL separator */
+ /* Empty loop */ ;
+ lang_key++; /* Skip NUL separator */
if (lang_key >= png_ptr->chunkdata + slength)
{
}
for (text = lang_key; *text; text++)
- /* empty loop */ ;
- text++; /* skip NUL separator */
+ /* Empty loop */ ;
+ text++; /* Skip NUL separator */
if (text >= png_ptr->chunkdata + slength)
{
png_warning(png_ptr, "Malformed iTXt chunk");
else
data_len = png_strlen(png_ptr->chunkdata + prefix_len);
text_ptr = (png_textp)png_malloc_warn(png_ptr,
- (png_uint_32)png_sizeof(png_text));
+ png_sizeof(png_text));
if (text_ptr == NULL)
{
- png_warning(png_ptr, "Not enough memory to process iTXt chunk.");
+ png_warning(png_ptr, "Not enough memory to process iTXt chunk");
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
return;
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
if (ret)
- png_error(png_ptr, "Insufficient memory to store iTXt chunk.");
+ png_error(png_ptr, "Insufficient memory to store iTXt chunk");
}
#endif
png_debug(1, "in png_handle_unknown");
- if (png_ptr->mode & PNG_HAVE_IDAT)
+#ifdef PNG_USER_LIMITS_SUPPORTED
+ if (png_ptr->user_chunk_cache_max != 0)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
- PNG_CONST PNG_IDAT;
+ if (png_ptr->user_chunk_cache_max == 1)
+ {
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ if (--png_ptr->user_chunk_cache_max == 1)
+ {
+ png_warning(png_ptr, "No space in chunk cache for unknown chunk");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ }
#endif
- if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
+
+ if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ PNG_IDAT;
+ if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */
png_ptr->mode |= PNG_AFTER_IDAT;
}
if (!(png_ptr->chunk_name[0] & 0x20))
{
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
PNG_HANDLE_CHUNK_ALWAYS
-#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
&& png_ptr->read_user_chunk_fn == NULL
#endif
)
png_chunk_error(png_ptr, "unknown critical chunk");
}
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
- if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) ||
- (png_ptr->read_user_chunk_fn != NULL))
+#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+ if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+ || (png_ptr->read_user_chunk_fn != NULL)
+#endif
+ )
{
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
}
#endif
png_memcpy((png_charp)png_ptr->unknown_chunk.name,
- (png_charp)png_ptr->chunk_name,
+ (png_charp)png_ptr->chunk_name,
png_sizeof(png_ptr->unknown_chunk.name));
- png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] = '\0';
+ png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1]
+ = '\0';
png_ptr->unknown_chunk.size = (png_size_t)length;
if (length == 0)
png_ptr->unknown_chunk.data = NULL;
png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
}
-#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
if (png_ptr->read_user_chunk_fn != NULL)
{
- /* callback to user unknown chunk handler */
+ /* Callback to user unknown chunk handler */
int ret;
ret = (*(png_ptr->read_user_chunk_fn))
(png_ptr, &png_ptr->unknown_chunk);
if (ret == 0)
{
if (!(png_ptr->chunk_name[0] & 0x20))
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
PNG_HANDLE_CHUNK_ALWAYS)
+#endif
png_chunk_error(png_ptr, "unknown critical chunk");
png_set_unknown_chunks(png_ptr, info_ptr,
&png_ptr->unknown_chunk, 1);
png_crc_finish(png_ptr, skip);
-#if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
- info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
+#ifndef PNG_READ_USER_CHUNKS_SUPPORTED
+ info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
#endif
}
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
png_uint_32 row_width = png_ptr->width;
int value;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
png_uint_32 row_width = png_ptr->width;
int value;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
png_bytep row = png_ptr->row_buf + 1;
int pass = png_ptr->pass;
png_uint_32 transformations = png_ptr->transformations;
-#ifdef PNG_USE_LOCAL_ARRAYS
- /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
- /* offset to next interlace block */
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* Offset to next interlace block */
PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-#endif
png_debug(1, "in png_do_read_interlace");
if (row != NULL && row_info != NULL)
png_uint_32 i;
int j;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (transformations & PNG_PACKSWAP)
{
sshift = (int)((row_info->width + 7) & 0x07);
int jstop = png_pass_inc[pass];
png_uint_32 i;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (transformations & PNG_PACKSWAP)
{
sshift = (int)(((row_info->width + 3) & 0x03) << 1);
png_uint_32 i;
int jstop = png_pass_inc[pass];
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (transformations & PNG_PACKSWAP)
{
sshift = (int)(((row_info->width + 1) & 0x01) << 2);
default:
{
png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
- png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
+ png_bytep sp = row + (png_size_t)(row_info->width - 1)
+ * pixel_bytes;
png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
int jstop = png_pass_inc[pass];
row_info->width = final_width;
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
}
-#if !defined(PNG_READ_PACKSWAP_SUPPORTED)
- transformations = transformations; /* silence compiler warning */
+#ifndef PNG_READ_PACKSWAP_SUPPORTED
+ transformations = transformations; /* Silence compiler warning */
#endif
}
#endif /* PNG_READ_INTERLACING_SUPPORTED */
rp++;
}
- for (i = 0; i < istop; i++) /* use leftover rp,pp */
+ for (i = 0; i < istop; i++) /* Use leftover rp,pp */
{
int a, b, c, pa, pb, pc, p;
}
}
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
void /* PRIVATE */
png_read_finish_row(png_structp png_ptr)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
#ifdef PNG_READ_INTERLACING_SUPPORTED
- /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
- /* start of interlace block */
+ /* Start of interlace block */
PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
- /* offset to next interlace block */
+ /* Offset to next interlace block */
PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
- /* start of interlace block in the y direction */
+ /* Start of interlace block in the y direction */
PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
- /* offset to next interlace block in the y direction */
+ /* Offset to next interlace block in the y direction */
PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
#endif /* PNG_READ_INTERLACING_SUPPORTED */
-#endif
png_debug(1, "in png_read_finish_row");
png_ptr->row_number++;
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
- png_memset_check(png_ptr, png_ptr->prev_row, 0,
+ png_memset(png_ptr->prev_row, 0,
png_ptr->rowbytes + 1);
do
{
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
- png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
- png_ptr->iwidth) + 1;
-
if (!(png_ptr->transformations & PNG_INTERLACE))
{
png_ptr->num_rows = (png_ptr->height +
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
{
-#ifdef PNG_USE_LOCAL_ARRAYS
- PNG_CONST PNG_IDAT;
-#endif
+ PNG_IDAT;
char extra;
int ret;
if (!(png_ptr->zstream.avail_out))
{
- png_warning(png_ptr, "Extra compressed data.");
+ png_warning(png_ptr, "Extra compressed data");
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
png_ptr->mode |= PNG_AFTER_IDAT;
}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
void /* PRIVATE */
png_read_start_row(png_structp png_ptr)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
#ifdef PNG_READ_INTERLACING_SUPPORTED
- /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
- /* start of interlace block */
+ /* Start of interlace block */
PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
- /* offset to next interlace block */
+ /* Offset to next interlace block */
PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
- /* start of interlace block in the y direction */
+ /* Start of interlace block in the y direction */
PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
- /* offset to next interlace block in the y direction */
+ /* Offset to next interlace block in the y direction */
PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-#endif
#endif
int max_pixel_depth;
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
-
- png_ptr->irowbytes =
- PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1;
}
else
#endif /* PNG_READ_INTERLACING_SUPPORTED */
{
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = png_ptr->width;
- png_ptr->irowbytes = png_ptr->rowbytes + 1;
}
max_pixel_depth = png_ptr->pixel_depth;
-#if defined(PNG_READ_PACK_SUPPORTED)
+#ifdef PNG_READ_PACK_SUPPORTED
if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8)
max_pixel_depth = 8;
#endif
-#if defined(PNG_READ_EXPAND_SUPPORTED)
+#ifdef PNG_READ_EXPAND_SUPPORTED
if (png_ptr->transformations & PNG_EXPAND)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
}
#endif
-#if defined(PNG_READ_FILLER_SUPPORTED)
+#ifdef PNG_READ_FILLER_SUPPORTED
if (png_ptr->transformations & (PNG_FILLER))
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
}
#endif
-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
if (png_ptr->transformations & PNG_GRAY_TO_RGB)
{
if (
-#if defined(PNG_READ_EXPAND_SUPPORTED)
+#ifdef PNG_READ_EXPAND_SUPPORTED
(png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
#endif
-#if defined(PNG_READ_FILLER_SUPPORTED)
+#ifdef PNG_READ_FILLER_SUPPORTED
(png_ptr->transformations & (PNG_FILLER)) ||
#endif
png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
}
#endif
- /* align the width on the next larger 8 pixels. Mainly used
- for interlacing */
+ /* Align the width on the next larger 8 pixels. Mainly used
+ * for interlacing
+ */
row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
- /* calculate the maximum bytes needed, adding a byte and a pixel
- for safety's sake */
+ /* Calculate the maximum bytes needed, adding a byte and a pixel
+ * for safety's sake
+ */
row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
1 + ((max_pixel_depth + 7) >> 3);
#ifdef PNG_MAX_MALLOC_64K
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
- if (row_bytes + 64 > png_ptr->old_big_row_buf_size)
+ if (row_bytes + 48 > png_ptr->old_big_row_buf_size)
{
png_free(png_ptr, png_ptr->big_row_buf);
- png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
- png_ptr->row_buf = png_ptr->big_row_buf+32;
- png_ptr->old_big_row_buf_size = row_bytes+64;
+ if (png_ptr->interlaced)
+ png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr,
+ row_bytes + 48);
+ else
+ png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr,
+ row_bytes + 48);
+ png_ptr->old_big_row_buf_size = row_bytes + 48;
+
+#ifdef PNG_ALIGNED_MEMORY_SUPPORTED
+ /* Use 16-byte aligned memory for row_buf with at least 16 bytes
+ * of padding before and after row_buf.
+ */
+ png_ptr->row_buf = png_ptr->big_row_buf + 32
+ - (((png_alloc_size_t)&(png_ptr->big_row_buf[0]) + 15) % 16);
+ png_ptr->old_big_row_buf_size = row_bytes + 48;
+#else
+ /* Use 32 bytes of padding before and 16 bytes after row_buf. */
+ png_ptr->row_buf = png_ptr->big_row_buf + 32;
+#endif
+ png_ptr->old_big_row_buf_size = row_bytes + 48;
}
#ifdef PNG_MAX_MALLOC_64K
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
- png_error(png_ptr, "Row has too many bytes to allocate in memory.");
+ png_error(png_ptr, "Row has too many bytes to allocate in memory");
- if (png_ptr->rowbytes+1 > png_ptr->old_prev_row_size)
+ if (png_ptr->rowbytes + 1 > png_ptr->old_prev_row_size)
{
- png_free(png_ptr, png_ptr->prev_row);
- png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
+ png_free(png_ptr, png_ptr->prev_row);
+ png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
png_ptr->rowbytes + 1));
- png_ptr->old_prev_row_size = png_ptr->rowbytes+1;
+ png_ptr->old_prev_row_size = png_ptr->rowbytes + 1;
}
- png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+ png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
png_debug1(3, "width = %lu,", png_ptr->width);
png_debug1(3, "height = %lu,", png_ptr->height);
png_debug1(3, "iwidth = %lu,", png_ptr->iwidth);
- png_debug1(3, "num_rows = %lu", png_ptr->num_rows);
+ png_debug1(3, "num_rows = %lu,", png_ptr->num_rows);
png_debug1(3, "rowbytes = %lu,", png_ptr->rowbytes);
- png_debug1(3, "irowbytes = %lu,", png_ptr->irowbytes);
+ png_debug1(3, "irowbytes = %lu",
+ PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
projects / wxWidgets.git / blobdiff