/* pngrutil.c - utilities to read a PNG file
*
- * libpng 1.0.1
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, Glenn Randers-Pehrson
- * March 15, 1998
+ * 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 file contains routines which are only called from within
+ * 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
-#include "../png/png.h"
+#define PNG_NO_PEDANTIC_WARNINGS
+#include "png.h"
+#ifdef PNG_READ_SUPPORTED
+#include "pngpriv.h"
-#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
-/* Grab an unsigned 32-bit integer from a buffer in big endian format. */
-png_uint_32
-png_get_uint_32(png_bytep buf)
+# define png_strtod(p,a,b) strtod(a,b)
+png_uint_32 PNGAPI
+png_get_uint_31(png_structp png_ptr, png_bytep buf)
{
- png_uint_32 i;
-
- 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_get_uint_32(buf);
+ if (i > PNG_UINT_31_MAX)
+ png_error(png_ptr, "PNG unsigned integer out of range");
+ return (i);
+}
+#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 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);
}
-#if defined(PNG_READ_pCAL_SUPPORTED)
-/* 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
-png_get_int_32(png_bytep buf)
+/* 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 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_uint_32 u = png_get_uint_32(buf);
+ if ((u & 0x80000000) == 0) /* non-negative */
+ return u;
- i = ((png_int_32)(*buf) << 24) +
- ((png_int_32)(*(buf + 1)) << 16) +
- ((png_int_32)(*(buf + 2)) << 8) +
- (png_int_32)(*(buf + 3));
+ 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 i =
+ ((png_uint_32)(*buf) << 8) +
+ ((png_uint_32)(*(buf + 1)));
return (i);
}
-#endif /* PNG_READ_pCAL_SUPPORTED */
+#endif /* PNG_USE_READ_MACROS */
-/* Grab an unsigned 16-bit integer from a buffer in big endian format. */
-png_uint_16
-png_get_uint_16(png_bytep buf)
+/* Read the chunk header (length + type name).
+ * Put the type name into png_ptr->chunk_name, and return the length.
+ */
+png_uint_32 /* PRIVATE */
+png_read_chunk_header(png_structp png_ptr)
{
- png_uint_16 i;
+ png_byte buf[8];
+ png_uint_32 length;
- i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
- (png_uint_16)(*(buf + 1)));
+#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
- return (i);
+ /* 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 */
+ 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 */
+ png_reset_crc(png_ptr);
+ png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
+
+ /* 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;
}
-#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
/* Read data, and (optionally) run it through the CRC. */
-void
+void /* PRIVATE */
png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
{
+ 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. */
-int
+ * 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)
{
- png_uint_32 i;
+ png_size_t i;
+ png_size_t istop = png_ptr->zbuf_size;
- for (i = skip; i > (png_uint_32)png_ptr->zbuf_size; i -= png_ptr->zbuf_size)
+ for (i = (png_size_t)skip; i > istop; i -= istop)
{
png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
}
if (i)
{
- png_crc_read(png_ptr, png_ptr->zbuf, (png_size_t)i);
+ png_crc_read(png_ptr, png_ptr->zbuf, i);
}
if (png_crc_error(png_ptr))
{
- if ((png_ptr->chunk_name[0] & 0x20 && /* Ancillary */
- !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
+ if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
+ !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
(!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
- png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))
+ (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
{
png_chunk_warning(png_ptr, "CRC error");
}
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. */
-int
+ * the data it has read thus far.
+ */
+int /* PRIVATE */
png_crc_error(png_structp png_ptr)
{
png_byte crc_bytes[4];
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)
return (0);
}
+#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
+ defined(PNG_READ_iCCP_SUPPORTED)
+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)
+{
+ png_size_t count = 0;
+
+ png_ptr->zstream.next_in = (png_bytep)data; /* const_cast: VALID */
+ png_ptr->zstream.avail_in = size;
+
+ while (1)
+ {
+ 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 = png_ptr->zbuf_size;
+
+ ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
+ avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out;
+
+ /* 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)
+ {
+ if (output != 0 && output_size > count)
+ {
+ int copy = output_size - count;
+ if (avail < copy) copy = avail;
+ png_memcpy(output + count, png_ptr->zbuf, copy);
+ }
+ count += avail;
+ }
+
+ if (ret == Z_OK)
+ continue;
+
+ /* Termination conditions - always reset the zstream, it
+ * must be left in inflateInit state.
+ */
+ png_ptr->zstream.avail_in = 0;
+ inflateReset(&png_ptr->zstream);
+
+ 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
+ {
+#ifdef PNG_STDIO_SUPPORTED
+ char umsg[52];
+
+ switch (ret)
+ {
+ 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);
+ }
+
+ /* 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 */
+ }
-/* read and check the IDHR chunk */
-void
+ 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
+# 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
+ 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)
+ {
+ png_memcpy(text, png_ptr->chunkdata, prefix_size);
+ 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 */
+
+ 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_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) */
+ {
+#ifdef PNG_STDIO_SUPPORTED
+ char umsg[50];
+
+ 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
+
+ /* 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 */
+void /* PRIVATE */
png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[13];
int bit_depth, color_type, compression_type, filter_type;
int interlace_type;
- png_debug(1, "in png_handle_IHDR\n");
+ png_debug(1, "in png_handle_IHDR");
- if (png_ptr->mode != PNG_BEFORE_IHDR)
+ 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");
png_crc_read(png_ptr, buf, 13);
png_crc_finish(png_ptr, 0);
- width = png_get_uint_32(buf);
- height = png_get_uint_32(buf + 4);
+ width = png_get_uint_31(png_ptr, buf);
+ height = png_get_uint_31(png_ptr, buf + 4);
bit_depth = buf[8];
color_type = buf[9];
compression_type = buf[10];
filter_type = buf[11];
interlace_type = buf[12];
- /* check for width and height valid values */
- if (width == 0 || width > (png_uint_32)2147483647L || height == 0 ||
- height > (png_uint_32)2147483647L)
- png_error(png_ptr, "Invalid image size in IHDR");
-
- /* check other values */
- if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
- bit_depth != 8 && bit_depth != 16)
- png_error(png_ptr, "Invalid bit depth in IHDR");
-
- if (color_type < 0 || color_type == 1 ||
- color_type == 5 || color_type > 6)
- png_error(png_ptr, "Invalid color type in IHDR");
-
- if ((color_type == PNG_COLOR_TYPE_PALETTE && bit_depth) > 8 ||
- ((color_type == PNG_COLOR_TYPE_RGB ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
- color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
- png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
-
- if (interlace_type >= PNG_INTERLACE_LAST)
- png_error(png_ptr, "Unknown interlace method in IHDR");
-
- if (compression_type != PNG_COMPRESSION_TYPE_BASE)
- png_error(png_ptr, "Unknown compression method in IHDR");
-
- if (filter_type != PNG_FILTER_TYPE_BASE)
- png_error(png_ptr, "Unknown filter method in IHDR");
-
- /* 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;
+#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_ptr->width *
- (png_uint_32)png_ptr->pixel_depth + 7) >> 3);
- png_debug1(3,"bit_depth = %d\n", png_ptr->bit_depth);
- png_debug1(3,"channels = %d\n", png_ptr->channels);
- png_debug1(3,"rowbytes = %d\n", png_ptr->rowbytes);
+ png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
+ png_debug1(3, "bit_depth = %d", png_ptr->bit_depth);
+ png_debug1(3, "channels = %d", png_ptr->channels);
+ png_debug1(3, "rowbytes = %lu", png_ptr->rowbytes);
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
color_type, interlace_type, compression_type, filter_type);
}
-/* read and check the palette */
-void
+/* Read and check the palette */
+void /* PRIVATE */
png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_colorp palette;
+ png_color palette[PNG_MAX_PALETTE_LENGTH];
int num, i;
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+ png_colorp pal_ptr;
+#endif
- png_debug(1, "in png_handle_PLTE\n");
+ png_debug(1, "in png_handle_PLTE");
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_ptr->mode |= PNG_HAVE_PLTE;
-#if defined (PNG_READ_tRNS_SUPPORTED)
- if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+ if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
{
- if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
- {
- if (png_ptr->num_trans > png_ptr->num_palette)
- {
- png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
- png_ptr->num_trans = png_ptr->num_palette;
- }
- }
+ png_warning(png_ptr,
+ "Ignoring PLTE chunk in grayscale PNG");
+ png_crc_finish(png_ptr, length);
+ return;
}
-#endif
-
-#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);
}
#endif
- if (length % 3)
+ if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
{
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
png_crc_finish(png_ptr, length);
return;
}
+
else
{
png_error(png_ptr, "Invalid palette chunk");
}
num = (int)length / 3;
- palette = (png_colorp)png_zalloc(png_ptr, (uInt)num, sizeof (png_color));
- png_ptr->flags |= PNG_FLAG_FREE_PALETTE;
+
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+ for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
+ {
+ png_byte buf[3];
+
+ png_crc_read(png_ptr, buf, 3);
+ pal_ptr->red = buf[0];
+ pal_ptr->green = buf[1];
+ pal_ptr->blue = buf[2];
+ }
+#else
for (i = 0; i < num; i++)
{
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_chunk_warning(png_ptr, "CRC error");
- png_ptr->flags &= ~PNG_FLAG_FREE_PALETTE;
- png_zfree(png_ptr, palette);
return;
}
}
}
}
#endif
- png_ptr->palette = palette;
- png_ptr->num_palette = (png_uint_16)num;
+
png_set_PLTE(png_ptr, info_ptr, palette, num);
+
+#ifdef PNG_READ_tRNS_SUPPORTED
+ if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+ {
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
+ {
+ if (png_ptr->num_trans > (png_uint_16)num)
+ {
+ png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
+ png_ptr->num_trans = (png_uint_16)num;
+ }
+ if (info_ptr->num_trans > (png_uint_16)num)
+ {
+ png_warning(png_ptr, "Truncating incorrect info tRNS chunk length");
+ info_ptr->num_trans = (png_uint_16)num;
+ }
+ }
+ }
+#endif
+
}
-void
+void /* PRIVATE */
png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_debug(1, "in png_handle_IEND\n");
+ png_debug(1, "in png_handle_IEND");
if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT))
{
png_error(png_ptr, "No image in file");
-
- /* to quiet compiler warnings about unused info_ptr */
- if (info_ptr == NULL)
- return;
}
- png_ptr->mode |= PNG_AFTER_IDAT | PNG_HAVE_IEND;
+ png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
if (length != 0)
{
png_warning(png_ptr, "Incorrect IEND chunk length");
}
png_crc_finish(png_ptr, length);
+
+ info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
}
-#if defined(PNG_READ_gAMA_SUPPORTED)
-void
+#ifdef PNG_READ_gAMA_SUPPORTED
+void /* PRIVATE */
png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_uint_32 igamma;
+ png_fixed_point igamma;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float file_gamma;
+#endif
png_byte buf[4];
- png_debug(1, "in png_handle_gAMA\n");
+ png_debug(1, "in png_handle_gAMA");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before gAMA");
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place gAMA chunk");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_gAMA
-#if defined(PNG_READ_sRGB_SUPPORTED)
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+#ifdef PNG_READ_sRGB_SUPPORTED
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
)
if (png_crc_finish(png_ptr, 0))
return;
- igamma = png_get_uint_32(buf);
- /* check for zero gamma */
+ igamma = (png_fixed_point)png_get_uint_32(buf);
+ /* Check for zero gamma */
if (igamma == 0)
- return;
+ {
+ png_warning(png_ptr,
+ "Ignoring gAMA chunk with gamma=0");
+ return;
+ }
-#if defined(PNG_READ_sRGB_SUPPORTED)
- if (info_ptr->valid & PNG_INFO_sRGB)
- if(igamma != (png_uint_32)45000L)
+#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_STDIO
- fprintf(stderr, "igamma = %lu\n", igamma);
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+ fprintf(stderr, "gamma = (%d/100000)", (int)igamma);
#endif
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
file_gamma = (float)igamma / (float)100000.0;
-#ifdef PNG_READ_GAMMA_SUPPORTED
- png_ptr->gamma = file_gamma;
+# ifdef PNG_READ_GAMMA_SUPPORTED
+ png_ptr->gamma = file_gamma;
+# endif
+ png_set_gAMA(png_ptr, info_ptr, file_gamma);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
#endif
- png_set_gAMA(png_ptr, info_ptr, file_gamma);
}
#endif
-#if defined(PNG_READ_sBIT_SUPPORTED)
-void
+#ifdef PNG_READ_sBIT_SUPPORTED
+void /* PRIVATE */
png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t truelen;
png_byte buf[4];
- png_debug(1, "in png_handle_sBIT\n");
+ png_debug(1, "in png_handle_sBIT");
buf[0] = buf[1] = buf[2] = buf[3] = 0;
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sBIT chunk");
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT)
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
{
png_warning(png_ptr, "Duplicate sBIT chunk");
png_crc_finish(png_ptr, length);
else
truelen = (png_size_t)png_ptr->channels;
- if (length != truelen)
+ if (length != truelen || length > 4)
{
png_warning(png_ptr, "Incorrect sBIT chunk length");
png_crc_finish(png_ptr, length);
else
{
png_ptr->sig_bit.gray = buf[0];
+ png_ptr->sig_bit.red = buf[0];
+ png_ptr->sig_bit.green = buf[0];
+ png_ptr->sig_bit.blue = buf[0];
png_ptr->sig_bit.alpha = buf[1];
}
png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
}
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
-void
+#ifdef PNG_READ_cHRM_SUPPORTED
+void /* PRIVATE */
png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_byte buf[4];
- png_uint_32 val;
+ png_byte buf[32];
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+#endif
+ png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
+ int_y_green, int_x_blue, int_y_blue;
+
+ png_uint_32 uint_x, uint_y;
- png_debug(1, "in png_handle_cHRM\n");
+ png_debug(1, "in png_handle_cHRM");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
- png_error(png_ptr, "Missing IHDR before sBIT");
+ png_error(png_ptr, "Missing IHDR before cHRM");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid cHRM after IDAT");
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before cHRM");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM
-#if defined(PNG_READ_sRGB_SUPPORTED)
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
+#ifdef PNG_READ_sRGB_SUPPORTED
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
)
return;
}
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- white_x = (float)val / (float)100000.0;
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- white_y = (float)val / (float)100000.0;
-
- if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
- white_x + white_y > 1.0)
- {
- png_warning(png_ptr, "Invalid cHRM white point");
- png_crc_finish(png_ptr, 24);
- return;
- }
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- red_x = (float)val / (float)100000.0;
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- red_y = (float)val / (float)100000.0;
-
- if (red_x < 0 || red_x > 0.8 || red_y < 0 || red_y > 0.8 ||
- red_x + red_y > 1.0)
- {
- png_warning(png_ptr, "Invalid cHRM red point");
- png_crc_finish(png_ptr, 16);
- return;
- }
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- green_x = (float)val / (float)100000.0;
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- green_y = (float)val / (float)100000.0;
-
- if (green_x < 0 || green_x > 0.8 || green_y < 0 || green_y > 0.8 ||
- green_x + green_y > 1.0)
- {
- png_warning(png_ptr, "Invalid cHRM green point");
- png_crc_finish(png_ptr, 8);
- return;
- }
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- blue_x = (float)val / (float)100000.0;
-
- png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- blue_y = (float)val / (float)100000.0;
-
- if (blue_x < (float)0 || blue_x > (float)0.8 || blue_y < (float)0 ||
- blue_y > (float)0.8 || blue_x + blue_y > (float)1.0)
- {
- png_warning(png_ptr, "Invalid cHRM blue point");
- png_crc_finish(png_ptr, 0);
- return;
- }
-
+ png_crc_read(png_ptr, buf, 32);
if (png_crc_finish(png_ptr, 0))
return;
-#if defined(PNG_READ_sRGB_SUPPORTED)
- if (info_ptr->valid & PNG_INFO_sRGB)
+ uint_x = png_get_uint_32(buf);
+ uint_y = png_get_uint_32(buf + 4);
+ int_x_white = (png_fixed_point)uint_x;
+ int_y_white = (png_fixed_point)uint_y;
+
+ uint_x = png_get_uint_32(buf + 8);
+ uint_y = png_get_uint_32(buf + 12);
+ int_x_red = (png_fixed_point)uint_x;
+ int_y_red = (png_fixed_point)uint_y;
+
+ uint_x = png_get_uint_32(buf + 16);
+ uint_y = png_get_uint_32(buf + 20);
+ int_x_green = (png_fixed_point)uint_x;
+ int_y_green = (png_fixed_point)uint_y;
+
+ uint_x = png_get_uint_32(buf + 24);
+ uint_y = png_get_uint_32(buf + 28);
+ int_x_blue = (png_fixed_point)uint_x;
+ int_y_blue = (png_fixed_point)uint_y;
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ white_x = (float)int_x_white / (float)100000.0;
+ white_y = (float)int_y_white / (float)100000.0;
+ red_x = (float)int_x_red / (float)100000.0;
+ red_y = (float)int_y_red / (float)100000.0;
+ green_x = (float)int_x_green / (float)100000.0;
+ green_y = (float)int_y_green / (float)100000.0;
+ blue_x = (float)int_x_blue / (float)100000.0;
+ blue_y = (float)int_y_blue / (float)100000.0;
+#endif
+
+#ifdef PNG_READ_sRGB_SUPPORTED
+ if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
{
- if (fabs(white_x - (float).3127) > (float).001 ||
- fabs(white_y - (float).3290) > (float).001 ||
- fabs( red_x - (float).6400) > (float).001 ||
- fabs( red_y - (float).3300) > (float).001 ||
- fabs(green_x - (float).3000) > (float).001 ||
- fabs(green_y - (float).6000) > (float).001 ||
- fabs( blue_x - (float).1500) > (float).001 ||
- fabs( blue_y - (float).0600) > (float).001)
+ if (PNG_OUT_OF_RANGE(int_x_white, 31270, 1000) ||
+ PNG_OUT_OF_RANGE(int_y_white, 32900, 1000) ||
+ PNG_OUT_OF_RANGE(int_x_red, 64000L, 1000) ||
+ PNG_OUT_OF_RANGE(int_y_red, 33000, 1000) ||
+ PNG_OUT_OF_RANGE(int_x_green, 30000, 1000) ||
+ PNG_OUT_OF_RANGE(int_y_green, 60000L, 1000) ||
+ PNG_OUT_OF_RANGE(int_x_blue, 15000, 1000) ||
+ PNG_OUT_OF_RANGE(int_y_blue, 6000, 1000))
{
-
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
-#ifndef PNG_NO_STDIO
- fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
+#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);
- fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
+ fprintf(stderr, "gx=%f, gy=%f, bx=%f, by=%f\n",
green_x, green_y, blue_x, blue_y);
+#else
+ fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
+ (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",
+ (long)int_x_green, (long)int_y_green,
+ (long)int_x_blue, (long)int_y_blue);
#endif
+#endif /* PNG_CONSOLE_IO_SUPPORTED */
}
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_cHRM(png_ptr, info_ptr,
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_set_cHRM_fixed(png_ptr, info_ptr,
+ int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
+ int_y_green, int_x_blue, int_y_blue);
+#endif
}
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-void
+#ifdef PNG_READ_sRGB_SUPPORTED
+void /* PRIVATE */
png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
int intent;
png_byte buf[1];
- png_debug(1, "in png_handle_sRGB\n");
+ png_debug(1, "in png_handle_sRGB");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sRGB");
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sRGB chunk");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB)
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
{
png_warning(png_ptr, "Duplicate sRGB chunk");
png_crc_finish(png_ptr, 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");
}
#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
- if ((info_ptr->valid & PNG_INFO_gAMA))
- if((png_uint_32)(png_ptr->gamma*(float)100000.+.5) != (png_uint_32)45000L)
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA))
+ {
+ png_fixed_point igamma;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ igamma=info_ptr->int_gamma;
+#else
+# ifdef PNG_FLOATING_POINT_SUPPORTED
+ igamma=(png_fixed_point)(info_ptr->gamma * 100000.);
+# endif
+#endif
+ if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
-#ifndef PNG_NO_STDIO
- fprintf(stderr,"gamma=%f\n",png_ptr->gamma);
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+# ifdef PNG_FIXED_POINT_SUPPORTED
+ fprintf(stderr, "incorrect gamma=(%d/100000)\n",
+ (int)png_ptr->int_gamma);
+# else
+# ifdef PNG_FLOATING_POINT_SUPPORTED
+ fprintf(stderr, "incorrect gamma=%f\n", png_ptr->gamma);
+# endif
+# endif
#endif
}
+ }
#endif /* PNG_READ_gAMA_SUPPORTED */
#ifdef PNG_READ_cHRM_SUPPORTED
- if (info_ptr->valid & PNG_INFO_cHRM)
- if (fabs(info_ptr->x_white - (float).3127) > (float).001 ||
- fabs(info_ptr->y_white - (float).3290) > (float).001 ||
- fabs( info_ptr->x_red - (float).6400) > (float).001 ||
- fabs( info_ptr->y_red - (float).3300) > (float).001 ||
- fabs(info_ptr->x_green - (float).3000) > (float).001 ||
- fabs(info_ptr->y_green - (float).6000) > (float).001 ||
- fabs( info_ptr->x_blue - (float).1500) > (float).001 ||
- fabs( info_ptr->y_blue - (float).0600) > (float).001)
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+ if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_x_red, 64000L, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_y_red, 33000, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_x_green, 30000, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_y_green, 60000L, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_x_blue, 15000, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->int_y_blue, 6000, 1000))
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
}
+#endif /* PNG_FIXED_POINT_SUPPORTED */
#endif /* PNG_READ_cHRM_SUPPORTED */
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
}
#endif /* PNG_READ_sRGB_SUPPORTED */
-#if defined(PNG_READ_tRNS_SUPPORTED)
-void
+#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_byte compression_type;
+ png_bytep pC;
+ png_charp profile;
+ png_uint_32 skip = 0;
+ png_uint_32 profile_size, profile_length;
+ png_size_t slength, prefix_length, data_length;
+
+ png_debug(1, "in png_handle_iCCP");
+
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before iCCP");
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ png_warning(png_ptr, "Invalid iCCP after IDAT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ else if (png_ptr->mode & PNG_HAVE_PLTE)
+ /* Should be an error, but we can cope with it */
+ png_warning(png_ptr, "Out of place iCCP chunk");
+
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
+ {
+ png_warning(png_ptr, "Duplicate iCCP chunk");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+
+#ifdef PNG_MAX_MALLOC_64K
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "iCCP chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+ if (png_crc_finish(png_ptr, skip))
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+
+ png_ptr->chunkdata[slength] = 0x00;
+
+ for (profile = png_ptr->chunkdata; *profile; profile++)
+ /* 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
+ */
+ if ( profile >= png_ptr->chunkdata + slength - 1)
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_warning(png_ptr, "Malformed iCCP chunk");
+ return;
+ }
+
+ /* Compression_type should always be zero */
+ compression_type = *profile++;
+ if (compression_type)
+ {
+ png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
+ compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8
+ wrote nonzero) */
+ }
+
+ prefix_length = profile - png_ptr->chunkdata;
+ png_decompress_chunk(png_ptr, compression_type,
+ slength, prefix_length, &data_length);
+
+ profile_length = data_length - prefix_length;
+
+ if ( prefix_length > data_length || profile_length < 4)
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_warning(png_ptr, "Profile size field missing from iCCP chunk");
+ return;
+ }
+
+ /* Check the profile_size recorded in the first 32 bits of the ICC profile */
+ pC = (png_bytep)(png_ptr->chunkdata + prefix_length);
+ profile_size = ((*(pC ))<<24) |
+ ((*(pC + 1))<<16) |
+ ((*(pC + 2))<< 8) |
+ ((*(pC + 3)) );
+
+ if (profile_size < profile_length)
+ profile_length = profile_size;
+
+ 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");
+#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;
+ }
+
+ png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata,
+ compression_type, png_ptr->chunkdata + prefix_length, profile_length);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+}
+#endif /* PNG_READ_iCCP_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_POINTER_INDEXING_SUPPORTED
+ png_sPLT_entryp pp;
+#endif
+ int data_length, entry_size, i;
+ png_uint_32 skip = 0;
+ png_size_t slength;
+
+ 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_warning(png_ptr, "Invalid sPLT after IDAT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+
+#ifdef PNG_MAX_MALLOC_64K
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "sPLT chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+ if (png_crc_finish(png_ptr, skip))
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+
+ png_ptr->chunkdata[slength] = 0x00;
+
+ 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 */
+ if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_warning(png_ptr, "malformed sPLT chunk");
+ return;
+ }
+
+ new_palette.depth = *entry_start++;
+ entry_size = (new_palette.depth == 8 ? 6 : 10);
+ data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
+
+ /* Integrity-check the data length */
+ if (data_length % entry_size)
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_warning(png_ptr, "sPLT chunk has bad length");
+ return;
+ }
+
+ new_palette.nentries = (png_int_32) ( data_length / entry_size);
+ if ((png_uint_32) new_palette.nentries >
+ (png_uint_32) (PNG_SIZE_MAX / png_sizeof(png_sPLT_entry)))
+ {
+ png_warning(png_ptr, "sPLT chunk too long");
+ return;
+ }
+ new_palette.entries = (png_sPLT_entryp)png_malloc_warn(
+ png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry));
+ if (new_palette.entries == NULL)
+ {
+ png_warning(png_ptr, "sPLT chunk requires too much memory");
+ return;
+ }
+
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
+ for (i = 0; i < new_palette.nentries; i++)
+ {
+ pp = new_palette.entries + i;
+
+ if (new_palette.depth == 8)
+ {
+ pp->red = *entry_start++;
+ pp->green = *entry_start++;
+ pp->blue = *entry_start++;
+ pp->alpha = *entry_start++;
+ }
+ else
+ {
+ pp->red = png_get_uint_16(entry_start); entry_start += 2;
+ pp->green = png_get_uint_16(entry_start); entry_start += 2;
+ pp->blue = png_get_uint_16(entry_start); entry_start += 2;
+ pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
+ }
+ pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+ }
+#else
+ pp = new_palette.entries;
+ for (i = 0; i < new_palette.nentries; i++)
+ {
+
+ if (new_palette.depth == 8)
+ {
+ pp[i].red = *entry_start++;
+ pp[i].green = *entry_start++;
+ pp[i].blue = *entry_start++;
+ pp[i].alpha = *entry_start++;
+ }
+ else
+ {
+ pp[i].red = png_get_uint_16(entry_start); entry_start += 2;
+ pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
+ pp[i].blue = png_get_uint_16(entry_start); entry_start += 2;
+ pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
+ }
+ pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+ }
+#endif
+
+ /* 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);
+
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_free(png_ptr, new_palette.entries);
+}
+#endif /* PNG_READ_sPLT_SUPPORTED */
+
+#ifdef PNG_READ_tRNS_SUPPORTED
+void /* PRIVATE */
png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_debug(1, "in png_handle_tRNS\n");
+ png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
+
+ png_debug(1, "in png_handle_tRNS");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before tRNS");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_warning(png_ptr, "Duplicate tRNS chunk");
png_crc_finish(png_ptr, length);
return;
}
- if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+ if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
- if (!(png_ptr->mode & PNG_HAVE_PLTE))
- {
- /* Should be an error, but we can cope with it */
- png_warning(png_ptr, "Missing PLTE before tRNS");
- }
- else if (length > png_ptr->num_palette)
+ png_byte buf[2];
+
+ if (length != 2)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
return;
}
- png_ptr->trans = (png_bytep)png_malloc(png_ptr, length);
- png_ptr->flags |= PNG_FLAG_FREE_TRANS;
- png_crc_read(png_ptr, png_ptr->trans, (png_size_t)length);
- png_ptr->num_trans = (png_uint_16)length;
+ png_crc_read(png_ptr, buf, 2);
+ png_ptr->num_trans = 1;
+ png_ptr->trans_color.gray = png_get_uint_16(buf);
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
png_crc_finish(png_ptr, length);
return;
}
-
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_GRAY)
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
- png_byte buf[6];
-
- if (length != 2)
+ if (!(png_ptr->mode & PNG_HAVE_PLTE))
+ {
+ /* Should be an error, but we can cope with it. */
+ png_warning(png_ptr, "Missing PLTE before tRNS");
+ }
+ if (length > (png_uint_32)png_ptr->num_palette ||
+ length > PNG_MAX_PALETTE_LENGTH)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
return;
}
-
- png_crc_read(png_ptr, buf, 2);
- png_ptr->num_trans = 1;
- png_ptr->trans_values.gray = png_get_uint_16(buf);
+ if (length == 0)
+ {
+ png_warning(png_ptr, "Zero length tRNS chunk");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ png_crc_read(png_ptr, readbuf, (png_size_t)length);
+ png_ptr->num_trans = (png_uint_16)length;
}
else
{
}
if (png_crc_finish(png_ptr, 0))
+ {
+ png_ptr->num_trans = 0;
return;
+ }
- png_set_tRNS(png_ptr, info_ptr, png_ptr->trans, png_ptr->num_trans,
- &(png_ptr->trans_values));
+ png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
+ &(png_ptr->trans_color));
}
#endif
-#if defined(PNG_READ_bKGD_SUPPORTED)
-void
+#ifdef PNG_READ_bKGD_SUPPORTED
+void /* PRIVATE */
png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t truelen;
png_byte buf[6];
- png_debug(1, "in png_handle_bKGD\n");
+ png_debug(1, "in png_handle_bKGD");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before bKGD");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_bKGD)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
{
png_warning(png_ptr, "Duplicate bKGD chunk");
png_crc_finish(png_ptr, length);
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_ptr->background.index = buf[0];
- png_ptr->background.red = (png_uint_16)png_ptr->palette[buf[0]].red;
- png_ptr->background.green = (png_uint_16)png_ptr->palette[buf[0]].green;
- png_ptr->background.blue = (png_uint_16)png_ptr->palette[buf[0]].blue;
+ if (info_ptr && info_ptr->num_palette)
+ {
+ if (buf[0] >= info_ptr->num_palette)
+ {
+ png_warning(png_ptr, "Incorrect bKGD chunk index value");
+ return;
+ }
+ png_ptr->background.red =
+ (png_uint_16)png_ptr->palette[buf[0]].red;
+ png_ptr->background.green =
+ (png_uint_16)png_ptr->palette[buf[0]].green;
+ png_ptr->background.blue =
+ (png_uint_16)png_ptr->palette[buf[0]].blue;
+ }
}
else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
{
}
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-void
+#ifdef PNG_READ_hIST_SUPPORTED
+void /* PRIVATE */
png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- int num, i;
+ unsigned int num, i;
+ png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
- png_debug(1, "in png_handle_hIST\n");
+ png_debug(1, "in png_handle_hIST");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before hIST");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_hIST)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
{
png_warning(png_ptr, "Duplicate hIST chunk");
png_crc_finish(png_ptr, length);
return;
}
- if (length != (png_uint_32)(2 * png_ptr->num_palette))
+ num = length / 2 ;
+ if (num != (unsigned int) png_ptr->num_palette || num >
+ (unsigned int) PNG_MAX_PALETTE_LENGTH)
{
png_warning(png_ptr, "Incorrect hIST chunk length");
png_crc_finish(png_ptr, length);
return;
}
- num = (int)length / 2;
- png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(num * sizeof (png_uint_16)));
- png_ptr->flags |= PNG_FLAG_FREE_HIST;
for (i = 0; i < num; i++)
{
png_byte buf[2];
png_crc_read(png_ptr, buf, 2);
- png_ptr->hist[i] = png_get_uint_16(buf);
+ readbuf[i] = png_get_uint_16(buf);
}
if (png_crc_finish(png_ptr, 0))
return;
- png_set_hIST(png_ptr, info_ptr, png_ptr->hist);
+ png_set_hIST(png_ptr, info_ptr, readbuf);
}
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
-void
+#ifdef PNG_READ_pHYs_SUPPORTED
+void /* PRIVATE */
png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[9];
png_uint_32 res_x, res_y;
int unit_type;
- png_debug(1, "in png_handle_pHYs\n");
+ png_debug(1, "in png_handle_pHYs");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
- png_error(png_ptr, "Missing IHDR before pHYS");
+ png_error(png_ptr, "Missing IHDR before pHYs");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
- png_warning(png_ptr, "Invalid pHYS after IDAT");
+ png_warning(png_ptr, "Invalid pHYs after IDAT");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
- png_warning(png_ptr, "Duplicate pHYS chunk");
+ png_warning(png_ptr, "Duplicate pHYs chunk");
png_crc_finish(png_ptr, length);
return;
}
}
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED)
-void
+#ifdef PNG_READ_oFFs_SUPPORTED
+void /* PRIVATE */
png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[9];
- png_uint_32 offset_x, offset_y;
+ png_int_32 offset_x, offset_y;
int unit_type;
- png_debug(1, "in png_handle_oFFs\n");
+ png_debug(1, "in png_handle_oFFs");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before oFFs");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
{
png_warning(png_ptr, "Duplicate oFFs chunk");
png_crc_finish(png_ptr, length);
if (png_crc_finish(png_ptr, 0))
return;
- offset_x = png_get_uint_32(buf);
- offset_y = png_get_uint_32(buf + 4);
+ offset_x = png_get_int_32(buf);
+ offset_y = png_get_int_32(buf + 4);
unit_type = buf[8];
png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
}
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-/* read the pCAL chunk (png-scivis-19970203) */
-void
+#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_charp purpose;
png_int_32 X0, X1;
png_byte type, nparams;
png_charp buf, units, endptr;
png_size_t slength;
int i;
- png_debug(1, "in png_handle_pCAL\n");
+ png_debug(1, "in png_handle_pCAL");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before pCAL");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
{
png_warning(png_ptr, "Duplicate pCAL chunk");
png_crc_finish(png_ptr, length);
return;
}
- png_debug1(2, "Allocating and reading pCAL chunk data (%d bytes)\n",
+ png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)",
length + 1);
- purpose = (png_charp)png_malloc(png_ptr, length + 1);
+ 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 for pCAL purpose");
+ return;
+ }
slength = (png_size_t)length;
- png_crc_read(png_ptr, (png_bytep)purpose, slength);
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
if (png_crc_finish(png_ptr, 0))
{
- png_free(png_ptr, purpose);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
- purpose[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\n");
- for (buf = purpose; *buf != '\0'; buf++)
- /* empty loop */ ;
+ png_debug(3, "Finding end of pCAL purpose string");
+ for (buf = png_ptr->chunkdata; *buf; buf++)
+ /* Empty loop */ ;
- endptr = purpose + slength;
+ endptr = png_ptr->chunkdata + slength;
/* We need to have at least 12 bytes after the purpose string
in order to get the parameter information. */
if (endptr <= buf + 12)
{
png_warning(png_ptr, "Invalid pCAL data");
- png_free(png_ptr, purpose);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
- png_debug(3, "Reading pCAL X0, X1, type, nparams, and units\n");
+ png_debug(3, "Reading pCAL X0, X1, type, nparams, and units");
X0 = png_get_int_32((png_bytep)buf+1);
X1 = png_get_int_32((png_bytep)buf+5);
type = buf[9];
nparams = buf[10];
units = buf + 11;
- png_debug(3, "Checking pCAL equation type and number of parameters\n");
+ png_debug(3, "Checking pCAL equation type and number of parameters");
/* Check that we have the right number of parameters for known
equation types. */
if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
(type == PNG_EQUATION_HYPERBOLIC && nparams != 4))
{
png_warning(png_ptr, "Invalid pCAL parameters for equation type");
- png_free(png_ptr, purpose);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
else if (type >= PNG_EQUATION_LAST)
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
}
- for (buf = units; *buf != 0x00; buf++)
+ for (buf = units; *buf; buf++)
/* Empty loop to move past the units string. */ ;
- png_debug(3, "Allocating pCAL parameters array\n");
- params = (png_charpp)png_malloc(png_ptr, (png_uint_32)(nparams
- *sizeof(png_charp))) ;
+ png_debug(3, "Allocating pCAL parameters array");
+ params = (png_charpp)png_malloc_warn(png_ptr,
+ (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");
+ return;
+ }
/* Get pointers to the start of each parameter string. */
for (i = 0; i < (int)nparams; i++)
{
buf++; /* Skip the null string terminator from previous parameter. */
- png_debug1(3, "Reading pCAL parameter %d\n", i);
- for (params[i] = buf; *buf != 0x00 && buf <= endptr; buf++)
+ png_debug1(3, "Reading pCAL parameter %d", i);
+ for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
/* Empty loop to move past each parameter string */ ;
/* Make sure we haven't run out of data yet */
if (buf > endptr)
{
png_warning(png_ptr, "Invalid pCAL data");
- png_free(png_ptr, purpose);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
png_free(png_ptr, params);
return;
}
}
- png_set_pCAL(png_ptr, info_ptr, purpose, X0, X1, type, nparams,
- units, params);
+ png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams,
+ units, params);
+
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ png_free(png_ptr, params);
+}
+#endif
+
+#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)
+{
+ png_charp ep;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ double width, height;
+ png_charp vp;
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_charp swidth, sheight;
+#endif
+#endif
+ png_size_t slength;
+
+ png_debug(1, "in png_handle_sCAL");
+
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before sCAL");
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ png_warning(png_ptr, "Invalid sCAL after IDAT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
+ {
+ png_warning(png_ptr, "Duplicate sCAL chunk");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+
+ png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)",
+ length + 1);
+ png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+ 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;
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+
+ if (png_crc_finish(png_ptr, 0))
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+
+ png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
+
+ 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
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
+ 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_strlen(ep));
+#endif
+#endif
+
+ for (ep = png_ptr->chunkdata; *ep; ep++)
+ /* 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)
+ png_free(png_ptr, swidth);
+#endif
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ height = png_strtod(png_ptr, ep, &vp);
+ 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
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
+ 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_strlen(ep));
+#endif
+#endif
+
+ if (png_ptr->chunkdata + slength < ep
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ || width <= 0. || height <= 0.
+#endif
+ )
+ {
+ png_warning(png_ptr, "Invalid sCAL data");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+ png_free(png_ptr, swidth);
+ png_free(png_ptr, sheight);
+#endif
+ return;
+ }
+
- png_free(png_ptr, purpose);
- png_free(png_ptr, params);
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ png_set_sCAL(png_ptr, info_ptr, png_ptr->chunkdata[0], width, height);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], swidth, sheight);
+#endif
+#endif
+
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+ png_free(png_ptr, swidth);
+ png_free(png_ptr, sheight);
+#endif
}
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-void
+#ifdef PNG_READ_tIME_SUPPORTED
+void /* PRIVATE */
png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[7];
png_time mod_time;
- png_debug(1, "in png_handle_tIME\n");
+ png_debug(1, "in png_handle_tIME");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Out of place tIME chunk");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
{
png_warning(png_ptr, "Duplicate tIME chunk");
png_crc_finish(png_ptr, 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
+void /* PRIVATE */
png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_textp text_ptr;
png_charp text;
png_uint_32 skip = 0;
png_size_t slength;
+ int ret;
+
+ png_debug(1, "in png_handle_tEXt");
- png_debug(1, "in png_handle_tEXt\n");
+#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
- key = (png_charp)png_malloc(png_ptr, length + 1);
+ 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");
+ return;
+ }
slength = (png_size_t)length;
- png_crc_read(png_ptr, (png_bytep)key, slength);
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
if (png_crc_finish(png_ptr, skip))
{
- png_free(png_ptr, key);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
+ 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(png_ptr, (png_uint_32)sizeof(png_text));
+ text_ptr = (png_textp)png_malloc_warn(png_ptr,
+ png_sizeof(png_text));
+ if (text_ptr == NULL)
+ {
+ png_warning(png_ptr, "Not enough memory to process text chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr->lang = NULL;
+ text_ptr->lang_key = NULL;
+ text_ptr->itxt_length = 0;
+#endif
text_ptr->text = text;
+ text_ptr->text_length = png_strlen(text);
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
png_free(png_ptr, text_ptr);
+ if (ret)
+ 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 */
-void
+#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)
{
- static char msg[] = "Error decoding zTXt chunk";
png_textp text_ptr;
- png_charp key;
png_charp text;
- int comp_type = PNG_TEXT_COMPRESSION_NONE;
- png_size_t slength;
+ int comp_type;
+ int ret;
+ png_size_t slength, prefix_len, data_len;
- png_debug(1, "in png_handle_zTXt\n");
+ 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");
there is no hard and fast rule to tell us where to stop. */
if (length > (png_uint_32)65535L)
{
- png_warning(png_ptr,"zTXt chunk too large to fit in memory");
+ png_warning(png_ptr, "zTXt chunk too large to fit in memory");
png_crc_finish(png_ptr, length);
return;
}
#endif
- key = (png_charp)png_malloc(png_ptr, length + 1);
+ 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, "Out of memory processing zTXt chunk");
+ return;
+ }
slength = (png_size_t)length;
- png_crc_read(png_ptr, (png_bytep)key, slength);
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
if (png_crc_finish(png_ptr, 0))
{
- png_free(png_ptr, key);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
return;
}
- key[slength] = 0x00;
+ png_ptr->chunkdata[slength] = 0x00;
- for (text = key; *text; text++)
- /* empty loop */ ;
+ for (text = png_ptr->chunkdata; *text; text++)
+ /* Empty loop */ ;
- /* zTXt must have some text after the keyword */
- if (text == key + slength)
+ /* zTXt must have some text after the chunkdataword */
+ if (text >= png_ptr->chunkdata + slength - 2)
{
- png_warning(png_ptr, "Zero length zTXt chunk");
+ png_warning(png_ptr, "Truncated zTXt chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
}
- else if ((comp_type = *(++text)) == PNG_TEXT_COMPRESSION_zTXt)
+ else
{
- png_size_t text_size, key_size;
- text++;
+ comp_type = *(++text);
+ if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
+ {
+ png_warning(png_ptr, "Unknown compression type in zTXt chunk");
+ comp_type = PNG_TEXT_COMPRESSION_zTXt;
+ }
+ text++; /* Skip the compression_method byte */
+ }
+ prefix_len = text - png_ptr->chunkdata;
- png_ptr->zstream.next_in = (png_bytep)text;
- png_ptr->zstream.avail_in = (uInt)(length - (text - key));
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ png_decompress_chunk(png_ptr, comp_type,
+ (png_size_t)length, prefix_len, &data_len);
- key_size = (png_size_t)(text - key);
- text_size = 0;
- text = NULL;
+ text_ptr = (png_textp)png_malloc_warn(png_ptr,
+ png_sizeof(png_text));
+ if (text_ptr == NULL)
+ {
+ png_warning(png_ptr, "Not enough memory to process zTXt chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+ text_ptr->compression = comp_type;
+ text_ptr->key = png_ptr->chunkdata;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr->lang = NULL;
+ text_ptr->lang_key = NULL;
+ text_ptr->itxt_length = 0;
+#endif
+ text_ptr->text = png_ptr->chunkdata + prefix_len;
+ text_ptr->text_length = data_len;
- while (png_ptr->zstream.avail_in)
- {
- int ret;
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
- ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
- if (ret != Z_OK && ret != Z_STREAM_END)
- {
- 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;
+ png_free(png_ptr, text_ptr);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ if (ret)
+ png_error(png_ptr, "Insufficient memory to store zTXt chunk");
+}
+#endif
- if (text == NULL)
- {
- text_size = key_size + sizeof(msg) + 1;
- text = (png_charp)png_malloc(png_ptr, (png_uint_32)text_size);
- png_memcpy(text, key, key_size);
- }
+#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_textp text_ptr;
+ png_charp key, lang, text, lang_key;
+ int comp_flag;
+ int comp_type = 0;
+ int ret;
+ png_size_t slength, prefix_len, data_len;
- text[text_size - 1] = 0x00;
+ png_debug(1, "in png_handle_iTXt");
- /* Copy what we can of the error message into the text chunk */
- text_size = (png_size_t)(slength - (text - key) - 1);
- text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
- png_memcpy(text + key_size, msg, text_size + 1);
- break;
- }
- if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
- {
- if (text == NULL)
- {
- text = (png_charp)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
- + key_size + 1));
- png_memcpy(text + key_size, png_ptr->zbuf,
- png_ptr->zbuf_size - png_ptr->zstream.avail_out);
- png_memcpy(text, key, key_size);
- text_size = key_size + png_ptr->zbuf_size -
- png_ptr->zstream.avail_out;
- *(text + text_size) = 0x00;
- }
- else
- {
- png_charp tmp;
-
- tmp = text;
- text = (png_charp)png_malloc(png_ptr, (png_uint_32)(text_size +
- png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
- 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)
- {
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- }
- else
- {
- break;
- }
- }
+#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
- inflateReset(&png_ptr->zstream);
- png_ptr->zstream.avail_in = 0;
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before iTXt");
+
+ if (png_ptr->mode & PNG_HAVE_IDAT)
+ png_ptr->mode |= PNG_AFTER_IDAT;
- png_free(png_ptr, key);
- key = text;
- text += key_size;
+#ifdef PNG_MAX_MALLOC_64K
+ /* We will no doubt have problems with chunks even half this size, but
+ there is no hard and fast rule to tell us where to stop. */
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "iTXt chunk too large to fit in memory");
+ png_crc_finish(png_ptr, length);
+ return;
}
- else /* if (comp_type >= PNG_TEXT_COMPRESSION_LAST) */
+#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_size_t text_size;
-#if !defined(PNG_NO_STDIO)
- char umsg[50];
+ png_warning(png_ptr, "No memory to process iTXt chunk");
+ return;
+ }
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
+ if (png_crc_finish(png_ptr, 0))
+ {
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
- sprintf(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[slength] = 0x00;
+
+ for (lang = png_ptr->chunkdata; *lang; lang++)
+ /* 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
+ */
+
+ if (lang >= png_ptr->chunkdata + slength - 3)
+ {
+ png_warning(png_ptr, "Truncated iTXt chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+ else
+ {
+ comp_flag = *lang++;
+ comp_type = *lang++;
+ }
+
+ for (lang_key = lang; *lang_key; lang_key++)
+ /* Empty loop */ ;
+ lang_key++; /* Skip NUL separator */
+
+ if (lang_key >= png_ptr->chunkdata + slength)
+ {
+ png_warning(png_ptr, "Truncated iTXt chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
- /* Copy what we can of the error message into the text chunk */
- text_size = (png_size_t)(slength - (text - key) - 1);
- text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
- png_memcpy(text, msg, text_size + 1);
+ for (text = lang_key; *text; text++)
+ /* Empty loop */ ;
+ text++; /* Skip NUL separator */
+ if (text >= png_ptr->chunkdata + slength)
+ {
+ png_warning(png_ptr, "Malformed iTXt chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
}
- text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
- text_ptr->compression = comp_type;
- text_ptr->key = key;
- text_ptr->text = text;
+ prefix_len = text - png_ptr->chunkdata;
+
+ key=png_ptr->chunkdata;
+ if (comp_flag)
+ png_decompress_chunk(png_ptr, comp_type,
+ (size_t)length, prefix_len, &data_len);
+ else
+ data_len = png_strlen(png_ptr->chunkdata + prefix_len);
+ text_ptr = (png_textp)png_malloc_warn(png_ptr,
+ png_sizeof(png_text));
+ if (text_ptr == NULL)
+ {
+ png_warning(png_ptr, "Not enough memory to process iTXt chunk");
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ return;
+ }
+ text_ptr->compression = (int)comp_flag + 1;
+ text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key);
+ text_ptr->lang = png_ptr->chunkdata + (lang - key);
+ text_ptr->itxt_length = data_len;
+ text_ptr->text_length = 0;
+ text_ptr->key = png_ptr->chunkdata;
+ text_ptr->text = png_ptr->chunkdata + prefix_len;
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr);
+ png_free(png_ptr, png_ptr->chunkdata);
+ png_ptr->chunkdata = NULL;
+ if (ret)
+ png_error(png_ptr, "Insufficient memory to store iTXt chunk");
}
#endif
/* This function is called when we haven't found a handler for a
chunk. If there isn't a problem with the chunk itself (ie bad
- chunk name, CRC, or a critical chunk), the chunk is silently ignored. */
-void
+ chunk name, CRC, or a critical chunk), the chunk is silently ignored
+ -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
+ case it will be saved away to be written out later. */
+void /* PRIVATE */
png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_debug(1, "in png_handle_unknown\n");
+ png_uint_32 skip = 0;
- /* In the future we can have code here that calls user-supplied
- * callback functions for unknown chunks before they are ignored or
- * cause an error.
- */
- png_check_chunk_name(png_ptr, png_ptr->chunk_name);
+ png_debug(1, "in png_handle_unknown");
- if (!(png_ptr->chunk_name[0] & 0x20))
+#ifdef PNG_USER_LIMITS_SUPPORTED
+ if (png_ptr->user_chunk_cache_max != 0)
{
- png_chunk_error(png_ptr, "unknown critical chunk");
-
- /* to quiet compiler warnings about unused info_ptr */
- if (info_ptr == NULL)
+ 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_ptr->mode & PNG_HAVE_IDAT)
- png_ptr->mode |= PNG_AFTER_IDAT;
+ {
+ PNG_IDAT;
+ if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */
+ png_ptr->mode |= PNG_AFTER_IDAT;
+ }
- png_crc_finish(png_ptr, length);
+ 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
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+ && png_ptr->read_user_chunk_fn == NULL
+#endif
+ )
+#endif
+ png_chunk_error(png_ptr, "unknown critical chunk");
+ }
+
+#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)
+ {
+ png_warning(png_ptr, "unknown chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+ png_memcpy((png_charp)png_ptr->unknown_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.size = (png_size_t)length;
+ if (length == 0)
+ png_ptr->unknown_chunk.data = NULL;
+ else
+ {
+ 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);
+ }
+#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
+ if (png_ptr->read_user_chunk_fn != NULL)
+ {
+ /* Callback to user unknown chunk handler */
+ int ret;
+ ret = (*(png_ptr->read_user_chunk_fn))
+ (png_ptr, &png_ptr->unknown_chunk);
+ if (ret < 0)
+ png_chunk_error(png_ptr, "error in user 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);
+ }
+ }
+ else
+#endif
+ png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+ png_free(png_ptr, png_ptr->unknown_chunk.data);
+ png_ptr->unknown_chunk.data = NULL;
+ }
+ else
+#endif
+ skip = length;
+
+ png_crc_finish(png_ptr, skip);
+#ifndef PNG_READ_USER_CHUNKS_SUPPORTED
+ info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
+#endif
}
/* This function is called to verify that a chunk name is valid.
functions to handle unknown critical chunks after we check that
the chunk name itself is valid. */
-#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
+#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
-void
+void /* PRIVATE */
png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
{
- png_debug(1, "in png_check_chunk_name\n");
+ png_debug(1, "in png_check_chunk_name");
if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3]))
{
}
}
-/* Combines the row recently read in with the previous row.
- This routine takes care of alpha and transparency if requested.
+/* Combines the row recently read in with the existing pixels in the
+ row. This routine takes care of alpha and transparency if requested.
This routine also handles the two methods of progressive display
of interlaced images, depending on the mask value.
The mask value describes which pixels are to be combined with
the row. The pattern always repeats every 8 pixels, so just 8
- bits are needed. A one indicates the pixels is to be combined,
+ bits are needed. A one indicates the pixel is to be combined,
a zero indicates the pixel is to be skipped. This is in addition
to any alpha or transparency value associated with the pixel. If
you want all pixels to be combined, pass 0xff (255) in mask. */
-void
-png_combine_row(png_structp png_ptr, png_bytep row,
- int mask)
+
+void /* PRIVATE */
+png_combine_row(png_structp png_ptr, png_bytep row, int mask)
{
- png_debug(1,"in png_combine_row\n");
+ png_debug(1, "in png_combine_row");
if (mask == 0xff)
{
png_memcpy(row, png_ptr->row_buf + 1,
- (png_size_t)((png_ptr->width *
- png_ptr->row_info.pixel_depth + 7) >> 3));
+ PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width));
}
else
{
{
case 1:
{
- png_bytep sp;
- png_bytep dp;
+ png_bytep sp = png_ptr->row_buf + 1;
+ png_bytep dp = row;
int s_inc, s_start, s_end;
- int m;
+ int m = 0x80;
int shift;
png_uint_32 i;
+ png_uint_32 row_width = png_ptr->width;
- sp = png_ptr->row_buf + 1;
- dp = row;
- m = 0x80;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
shift = s_start;
- for (i = 0; i < png_ptr->width; i++)
+ for (i = 0; i < row_width; i++)
{
if (m & mask)
{
int value;
- value = (*sp >> shift) & 0x1;
+ value = (*sp >> shift) & 0x01;
*dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
}
case 2:
{
- png_bytep sp;
- png_bytep dp;
+ png_bytep sp = png_ptr->row_buf + 1;
+ png_bytep dp = row;
int s_start, s_end, s_inc;
- int m;
+ int m = 0x80;
int shift;
png_uint_32 i;
+ png_uint_32 row_width = png_ptr->width;
int value;
- sp = png_ptr->row_buf + 1;
- dp = row;
- m = 0x80;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
shift = s_start;
- for (i = 0; i < png_ptr->width; i++)
+ for (i = 0; i < row_width; i++)
{
if (m & mask)
{
- value = (*sp >> shift) & 0x3;
+ value = (*sp >> shift) & 0x03;
*dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
}
case 4:
{
- png_bytep sp;
- png_bytep dp;
+ png_bytep sp = png_ptr->row_buf + 1;
+ png_bytep dp = row;
int s_start, s_end, s_inc;
- int m;
+ int m = 0x80;
int shift;
png_uint_32 i;
+ png_uint_32 row_width = png_ptr->width;
int value;
- sp = png_ptr->row_buf + 1;
- dp = row;
- m = 0x80;
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (png_ptr->transformations & PNG_PACKSWAP)
{
s_start = 0;
}
shift = s_start;
- for (i = 0; i < png_ptr->width; i++)
+ for (i = 0; i < row_width; i++)
{
if (m & mask)
{
}
default:
{
- png_bytep sp;
- png_bytep dp;
- png_size_t pixel_bytes;
+ png_bytep sp = png_ptr->row_buf + 1;
+ png_bytep dp = row;
+ png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
png_uint_32 i;
- png_byte m;
+ png_uint_32 row_width = png_ptr->width;
+ png_byte m = 0x80;
- pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
- sp = png_ptr->row_buf + 1;
- dp = row;
- m = 0x80;
- for (i = 0; i < png_ptr->width; i++)
+ for (i = 0; i < row_width; i++)
{
if (m & mask)
{
}
}
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-void
-png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+/* OLD pre-1.0.9 interface:
+void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
png_uint_32 transformations)
+ */
+void /* PRIVATE */
+png_do_read_interlace(png_structp png_ptr)
{
- png_debug(1,"in png_do_read_interlace\n");
+ png_row_infop row_info = &(png_ptr->row_info);
+ png_bytep row = png_ptr->row_buf + 1;
+ int pass = png_ptr->pass;
+ png_uint_32 transformations = png_ptr->transformations;
+ /* 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};
+
+ png_debug(1, "in png_do_read_interlace");
if (row != NULL && row_info != NULL)
{
png_uint_32 final_width;
{
case 1:
{
- png_bytep sp, dp;
+ png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
+ png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
int sshift, dshift;
int s_start, s_end, s_inc;
+ int jstop = png_pass_inc[pass];
png_byte v;
png_uint_32 i;
int j;
- sp = row + (png_size_t)((row_info->width - 1) >> 3);
- dp = row + (png_size_t)((final_width - 1) >> 3);
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (transformations & PNG_PACKSWAP)
{
- sshift = (int)((row_info->width + 7) & 7);
- dshift = (int)((final_width + 7) & 7);
+ sshift = (int)((row_info->width + 7) & 0x07);
+ dshift = (int)((final_width + 7) & 0x07);
s_start = 7;
s_end = 0;
s_inc = -1;
else
#endif
{
- sshift = 7 - (int)((row_info->width + 7) & 7);
- dshift = 7 - (int)((final_width + 7) & 7);
+ sshift = 7 - (int)((row_info->width + 7) & 0x07);
+ dshift = 7 - (int)((final_width + 7) & 0x07);
s_start = 0;
s_end = 7;
s_inc = 1;
}
- for (i = row_info->width; i; i--)
+ for (i = 0; i < row_info->width; i++)
{
- v = (png_byte)((*sp >> sshift) & 0x1);
- for (j = 0; j < png_pass_inc[pass]; j++)
+ v = (png_byte)((*sp >> sshift) & 0x01);
+ for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
}
case 2:
{
- png_bytep sp, dp;
+ png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
+ png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
int sshift, dshift;
int s_start, s_end, s_inc;
+ int jstop = png_pass_inc[pass];
png_uint_32 i;
- sp = row + (png_uint_32)((row_info->width - 1) >> 2);
- dp = row + (png_uint_32)((final_width - 1) >> 2);
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (transformations & PNG_PACKSWAP)
{
- sshift = (int)(((row_info->width + 3) & 3) << 1);
- dshift = (int)(((final_width + 3) & 3) << 1);
+ sshift = (int)(((row_info->width + 3) & 0x03) << 1);
+ dshift = (int)(((final_width + 3) & 0x03) << 1);
s_start = 6;
s_end = 0;
s_inc = -2;
else
#endif
{
- sshift = (int)((3 - ((row_info->width + 3) & 3)) << 1);
- dshift = (int)((3 - ((final_width + 3) & 3)) << 1);
+ sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
+ dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
s_start = 0;
s_end = 6;
s_inc = 2;
}
- for (i = row_info->width; i; i--)
+ for (i = 0; i < row_info->width; i++)
{
png_byte v;
int j;
- v = (png_byte)((*sp >> sshift) & 0x3);
- for (j = 0; j < png_pass_inc[pass]; j++)
+ v = (png_byte)((*sp >> sshift) & 0x03);
+ for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
}
case 4:
{
- png_bytep sp, dp;
+ png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
+ png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
int sshift, dshift;
int s_start, s_end, s_inc;
png_uint_32 i;
+ int jstop = png_pass_inc[pass];
- sp = row + (png_size_t)((row_info->width - 1) >> 1);
- dp = row + (png_size_t)((final_width - 1) >> 1);
-#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+#ifdef PNG_READ_PACKSWAP_SUPPORTED
if (transformations & PNG_PACKSWAP)
{
- sshift = (int)(((row_info->width + 1) & 1) << 2);
- dshift = (int)(((final_width + 1) & 1) << 2);
+ sshift = (int)(((row_info->width + 1) & 0x01) << 2);
+ dshift = (int)(((final_width + 1) & 0x01) << 2);
s_start = 4;
s_end = 0;
s_inc = -4;
else
#endif
{
- sshift = (int)((1 - ((row_info->width + 1) & 1)) << 2);
- dshift = (int)((1 - ((final_width + 1) & 1)) << 2);
+ sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
+ dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
s_start = 0;
s_end = 4;
s_inc = 4;
}
- for (i = row_info->width; i; i--)
+ for (i = 0; i < row_info->width; i++)
{
- png_byte v;
+ png_byte v = (png_byte)((*sp >> sshift) & 0xf);
int j;
- v = (png_byte)((*sp >> sshift) & 0xf);
- for (j = 0; j < png_pass_inc[pass]; j++)
+ for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
}
default:
{
- png_bytep sp, dp;
- png_uint_32 i;
- png_size_t pixel_bytes;
+ 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 dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
- pixel_bytes = (row_info->pixel_depth >> 3);
+ int jstop = png_pass_inc[pass];
+ png_uint_32 i;
- sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
- dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
- for (i = row_info->width; i; i--)
+ for (i = 0; i < row_info->width; i++)
{
png_byte v[8];
int j;
png_memcpy(v, sp, pixel_bytes);
- for (j = 0; j < png_pass_inc[pass]; j++)
+ for (j = 0; j < jstop; j++)
{
png_memcpy(dp, v, pixel_bytes);
dp -= pixel_bytes;
}
}
row_info->width = final_width;
- row_info->rowbytes = ((final_width *
- (png_uint_32)row_info->pixel_depth + 7) >> 3);
+ row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
}
-}
+#ifndef PNG_READ_PACKSWAP_SUPPORTED
+ transformations = transformations; /* Silence compiler warning */
#endif
+}
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
-void
+void /* PRIVATE */
png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
png_bytep prev_row, int filter)
{
- png_debug(1, "in png_read_filter_row\n");
- png_debug2(2,"row = %d, filter = %d\n", png_ptr->row_number, filter);
-
-
+ png_debug(1, "in png_read_filter_row");
+ png_debug2(2, "row = %lu, filter = %d", png_ptr->row_number, filter);
switch (filter)
{
case PNG_FILTER_VALUE_NONE:
case PNG_FILTER_VALUE_SUB:
{
png_uint_32 i;
- int bpp;
- png_bytep rp;
- png_bytep lp;
+ png_uint_32 istop = row_info->rowbytes;
+ png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+ png_bytep rp = row + bpp;
+ png_bytep lp = row;
- bpp = (row_info->pixel_depth + 7) / 8;
- for (i = (png_uint_32)bpp, rp = row + bpp, lp = row;
- i < row_info->rowbytes; i++, rp++, lp++)
+ for (i = bpp; i < istop; i++)
{
- *rp = (png_byte)(((int)(*rp) + (int)(*lp)) & 0xff);
+ *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
+ rp++;
}
break;
}
case PNG_FILTER_VALUE_UP:
{
png_uint_32 i;
- png_bytep rp;
- png_bytep pp;
+ png_uint_32 istop = row_info->rowbytes;
+ png_bytep rp = row;
+ png_bytep pp = prev_row;
- for (i = 0, rp = row, pp = prev_row;
- i < row_info->rowbytes; i++, rp++, pp++)
+ for (i = 0; i < istop; i++)
{
- *rp = (png_byte)(((int)(*rp) + (int)(*pp)) & 0xff);
+ *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+ rp++;
}
break;
}
case PNG_FILTER_VALUE_AVG:
{
png_uint_32 i;
- int bpp;
- png_bytep rp;
- png_bytep pp;
- png_bytep lp;
-
- bpp = (row_info->pixel_depth + 7) / 8;
- for (i = 0, rp = row, pp = prev_row;
- i < (png_uint_32)bpp; i++, rp++, pp++)
+ png_bytep rp = row;
+ png_bytep pp = prev_row;
+ png_bytep lp = row;
+ png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+ png_uint_32 istop = row_info->rowbytes - bpp;
+
+ for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) +
- ((int)(*pp) / 2)) & 0xff);
+ ((int)(*pp++) / 2 )) & 0xff);
+ rp++;
}
- for (lp = row; i < row_info->rowbytes; i++, rp++, lp++, pp++)
+
+ for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) +
- (int)(*pp + *lp) / 2) & 0xff);
+ (int)(*pp++ + *lp++) / 2 ) & 0xff);
+ rp++;
}
break;
}
case PNG_FILTER_VALUE_PAETH:
{
- int bpp;
png_uint_32 i;
- png_bytep rp;
- png_bytep pp;
- png_bytep lp;
- png_bytep cp;
-
- bpp = (row_info->pixel_depth + 7) / 8;
- for (i = 0, rp = row, pp = prev_row,
- lp = row - bpp, cp = prev_row - bpp;
- i < row_info->rowbytes; i++, rp++, pp++, lp++, cp++)
+ png_bytep rp = row;
+ png_bytep pp = prev_row;
+ png_bytep lp = row;
+ png_bytep cp = prev_row;
+ png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+ png_uint_32 istop=row_info->rowbytes - bpp;
+
+ for (i = 0; i < bpp; i++)
+ {
+ *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+ rp++;
+ }
+
+ for (i = 0; i < istop; i++) /* Use leftover rp,pp */
{
int a, b, c, pa, pb, pc, p;
- b = *pp;
- if (i >= (png_uint_32)bpp)
- {
- c = *cp;
- a = *lp;
- }
- else
- {
- a = c = 0;
- }
- p = a + b - c;
- pa = abs(p - a);
- pb = abs(p - b);
- pc = abs(p - c);
-
- if (pa <= pb && pa <= pc)
- p = a;
- else if (pb <= pc)
- p = b;
- else
- p = c;
+ a = *lp++;
+ b = *pp++;
+ c = *cp++;
+
+ p = b - c;
+ pc = a - c;
+
+#ifdef PNG_USE_ABS
+ pa = abs(p);
+ pb = abs(pc);
+ pc = abs(p + pc);
+#else
+ pa = p < 0 ? -p : p;
+ pb = pc < 0 ? -pc : pc;
+ pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#endif
+
+ /*
+ if (pa <= pb && pa <= pc)
+ p = a;
+ else if (pb <= pc)
+ p = b;
+ else
+ p = c;
+ */
+
+ p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c;
*rp = (png_byte)(((int)(*rp) + p) & 0xff);
+ rp++;
}
break;
}
default:
- png_error(png_ptr, "Bad adaptive filter type");
+ png_warning(png_ptr, "Ignoring bad adaptive filter type");
+ *row = 0;
break;
}
}
-void
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+void /* PRIVATE */
png_read_finish_row(png_structp png_ptr)
{
- png_debug(1, "in png_read_finish_row\n");
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* Start of interlace block */
+ PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* 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 */
+ PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* 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 */
+
+ png_debug(1, "in png_read_finish_row");
png_ptr->row_number++;
if (png_ptr->row_number < png_ptr->num_rows)
return;
+#ifdef PNG_READ_INTERLACING_SUPPORTED
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
- 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);
do
{
png_ptr->pass++;
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
- png_ptr->irowbytes = ((png_ptr->iwidth *
- (png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
if (!(png_ptr->transformations & PNG_INTERLACE))
{
if (!(png_ptr->num_rows))
continue;
}
- if (png_ptr->transformations & PNG_INTERLACE)
+ else /* if (png_ptr->transformations & PNG_INTERLACE) */
break;
} while (png_ptr->iwidth == 0);
if (png_ptr->pass < 7)
return;
}
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
{
+ PNG_IDAT;
char extra;
int ret;
png_ptr->zstream.next_out = (Byte *)&extra;
png_ptr->zstream.avail_out = (uInt)1;
- for(;;)
+ for (;;)
{
if (!(png_ptr->zstream.avail_in))
{
png_crc_finish(png_ptr, 0);
png_read_data(png_ptr, chunk_length, 4);
- png_ptr->idat_size = png_get_uint_32(chunk_length);
-
+ 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);
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in ||
png_ptr->idat_size)
- png_error(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;
"Decompression Error");
if (!(png_ptr->zstream.avail_out))
- png_error(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->zstream.avail_out = 0;
}
if (png_ptr->idat_size || png_ptr->zstream.avail_in)
- png_error(png_ptr, "Extra compression data");
+ png_warning(png_ptr, "Extra compression data");
inflateReset(&png_ptr->zstream);
png_ptr->mode |= PNG_AFTER_IDAT;
}
+#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
-void
+void /* PRIVATE */
png_read_start_row(png_structp png_ptr)
{
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* Start of interlace block */
+ PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* 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 */
+ PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* Offset to next interlace block in the y direction */
+ PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
int max_pixel_depth;
- png_uint_32 rowbytes;
+ png_size_t row_bytes;
- png_debug(1, "in png_read_start_row\n");
+ png_debug(1, "in png_read_start_row");
png_ptr->zstream.avail_in = 0;
png_init_read_transformations(png_ptr);
+#ifdef PNG_READ_INTERLACING_SUPPORTED
if (png_ptr->interlaced)
{
if (!(png_ptr->transformations & PNG_INTERLACE))
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
-
- rowbytes = ((png_ptr->iwidth *
- (png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
- png_ptr->irowbytes = (png_size_t)rowbytes;
- if((png_uint_32)png_ptr->irowbytes != rowbytes)
- png_error(png_ptr, "Rowbytes overflow in png_read_start_row");
}
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 (max_pixel_depth < 32)
+ if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
max_pixel_depth = 32;
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
+ {
+ if (max_pixel_depth <= 8)
+ max_pixel_depth = 16;
+ else
+ max_pixel_depth = 32;
+ }
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
+ {
+ if (max_pixel_depth <= 32)
+ max_pixel_depth = 32;
+ else
+ max_pixel_depth = 64;
+ }
}
#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 ((png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
- png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+ if (
+#ifdef PNG_READ_EXPAND_SUPPORTED
+ (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
+#endif
+#ifdef PNG_READ_FILLER_SUPPORTED
+ (png_ptr->transformations & (PNG_FILLER)) ||
+#endif
+ png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (max_pixel_depth <= 16)
max_pixel_depth = 32;
- else if (max_pixel_depth <= 32)
+ else
max_pixel_depth = 64;
}
else
{
if (max_pixel_depth <= 8)
- max_pixel_depth = 24;
- else if (max_pixel_depth <= 16)
+ {
+ if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ max_pixel_depth = 32;
+ else
+ max_pixel_depth = 24;
+ }
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ max_pixel_depth = 64;
+ else
max_pixel_depth = 48;
}
}
#endif
- /* align the width on the next larger 8 pixels. Mainly used
- for interlacing */
- rowbytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
- /* calculate the maximum bytes needed, adding a byte and a pixel
- for safety sake */
- rowbytes = ((rowbytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
+defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ if (png_ptr->transformations & PNG_USER_TRANSFORM)
+ {
+ int user_pixel_depth = png_ptr->user_transform_depth*
+ png_ptr->user_transform_channels;
+ if (user_pixel_depth > max_pixel_depth)
+ max_pixel_depth=user_pixel_depth;
+ }
+#endif
+
+ /* 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
+ */
+ row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
1 + ((max_pixel_depth + 7) >> 3);
#ifdef PNG_MAX_MALLOC_64K
- if (rowbytes > (png_uint_32)65536L)
+ if (row_bytes > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
- png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, rowbytes);
+
+ if (row_bytes + 48 > png_ptr->old_big_row_buf_size)
+ {
+ png_free(png_ptr, png_ptr->big_row_buf);
+ 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
if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
- png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
- png_ptr->rowbytes + 1));
+ 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");
+
+ 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_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 = %d,\n", png_ptr->width);
- png_debug1(3, "height = %d,\n", png_ptr->height);
- png_debug1(3, "iwidth = %d,\n", png_ptr->iwidth);
- png_debug1(3, "num_rows = %d\n", png_ptr->num_rows);
- png_debug1(3, "rowbytes = %d,\n", png_ptr->rowbytes);
- png_debug1(3, "irowbytes = %d,\n", png_ptr->irowbytes);
+ 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, "rowbytes = %lu,", png_ptr->rowbytes);
+ png_debug1(3, "irowbytes = %lu",
+ PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
+#endif /* PNG_READ_SUPPORTED */
projects / wxWidgets.git / blobdiff