/* pngrutil.c - utilities to read a PNG file
*
- * Last changed in libpng 1.4.3 [June 26, 2010]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.2 [March 31, 2011]
+ * Copyright (c) 1998-2011 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.)
*
* libpng itself during the course of reading an image.
*/
-#define PNG_NO_PEDANTIC_WARNINGS
-#include "png.h"
-#ifdef PNG_READ_SUPPORTED
#include "pngpriv.h"
-# define png_strtod(p,a,b) strtod(a,b)
+#ifdef PNG_READ_SUPPORTED
+
+#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_get_uint_31(png_structp png_ptr, png_const_bytep buf)
+{
+ png_uint_32 uval = png_get_uint_32(buf);
+
+ if (uval > PNG_UINT_31_MAX)
+ png_error(png_ptr, "PNG unsigned integer out of range");
+
+ return (uval);
+}
+
+#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED)
+/* The following is a variation on the above for use with the fixed
+ * point values used for gAMA and cHRM. Instead of png_error it
+ * issues a warning and returns (-1) - an invalid value because both
+ * gAMA and cHRM use *unsigned* integers for fixed point values.
+ */
+#define PNG_FIXED_ERROR (-1)
+
+static png_fixed_point /* PRIVATE */
+png_get_fixed_point(png_structp png_ptr, png_const_bytep buf)
{
- 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);
+ png_uint_32 uval = png_get_uint_32(buf);
+
+ if (uval <= PNG_UINT_31_MAX)
+ return (png_fixed_point)uval; /* known to be in range */
+
+ /* The caller can turn off the warning by passing NULL. */
+ if (png_ptr != NULL)
+ png_warning(png_ptr, "PNG fixed point integer out of range");
+
+ return PNG_FIXED_ERROR;
}
-#ifndef PNG_USE_READ_MACROS
+#endif
+
+#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
+/* NOTE: the read macros will obscure these definitions, so that if
+ * PNG_USE_READ_MACROS is set the library will not use them internally,
+ * but the APIs will still be available externally.
+ *
+ * The parentheses around "PNGAPI function_name" in the following three
+ * functions are necessary because they allow the macros to co-exist with
+ * these (unused but exported) functions.
+ */
+
/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
-png_uint_32 PNGAPI
-png_get_uint_32(png_bytep buf)
+png_uint_32 (PNGAPI
+png_get_uint_32)(png_const_bytep buf)
{
- png_uint_32 i = ((png_uint_32)(*buf) << 24) +
- ((png_uint_32)(*(buf + 1)) << 16) +
- ((png_uint_32)(*(buf + 2)) << 8) +
- (png_uint_32)(*(buf + 3));
+ png_uint_32 uval =
+ ((png_uint_32)(*(buf )) << 24) +
+ ((png_uint_32)(*(buf + 1)) << 16) +
+ ((png_uint_32)(*(buf + 2)) << 8) +
+ ((png_uint_32)(*(buf + 3)) ) ;
- return (i);
+ return uval;
}
/* 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.
+ * 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 (PNGAPI
+png_get_int_32)(png_const_bytep buf)
{
- png_int_32 i = ((png_int_32)(*buf) << 24) +
- ((png_int_32)(*(buf + 1)) << 16) +
- ((png_int_32)(*(buf + 2)) << 8) +
- (png_int_32)(*(buf + 3));
+ png_uint_32 uval = png_get_uint_32(buf);
+ if ((uval & 0x80000000L) == 0) /* non-negative */
+ return uval;
- return (i);
+ uval = (uval ^ 0xffffffffL) + 1; /* 2's complement: -x = ~x+1 */
+ return -(png_int_32)uval;
}
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
-png_uint_16 PNGAPI
-png_get_uint_16(png_bytep buf)
+png_uint_16 (PNGAPI
+png_get_uint_16)(png_const_bytep buf)
{
- png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
- (png_uint_16)(*(buf + 1)));
+ /* ANSI-C requires an int value to accomodate at least 16 bits so this
+ * works and allows the compiler not to worry about possible narrowing
+ * on 32 bit systems. (Pre-ANSI systems did not make integers smaller
+ * than 16 bits either.)
+ */
+ unsigned int val =
+ ((unsigned int)(*buf) << 8) +
+ ((unsigned int)(*(buf + 1)));
- return (i);
+ return (png_uint_16)val;
+}
+
+#endif /* PNG_READ_INT_FUNCTIONS_SUPPORTED */
+
+/* Read and check the PNG file signature */
+void /* PRIVATE */
+png_read_sig(png_structp png_ptr, png_infop info_ptr)
+{
+ png_size_t num_checked, num_to_check;
+
+ /* Exit if the user application does not expect a signature. */
+ if (png_ptr->sig_bytes >= 8)
+ return;
+
+ num_checked = png_ptr->sig_bytes;
+ num_to_check = 8 - num_checked;
+
+#ifdef PNG_IO_STATE_SUPPORTED
+ png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE;
+#endif
+
+ /* The signature must be serialized in a single I/O call. */
+ png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
+ png_ptr->sig_bytes = 8;
+
+ if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
+ {
+ if (num_checked < 4 &&
+ png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
+ png_error(png_ptr, "Not a PNG file");
+ else
+ png_error(png_ptr, "PNG file corrupted by ASCII conversion");
+ }
+ if (num_checked < 3)
+ png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
-#endif /* PNG_USE_READ_MACROS */
/* Read the chunk header (length + type name).
* Put the type name into png_ptr->chunk_name, and return the length.
png_uint_32 length;
#ifdef PNG_IO_STATE_SUPPORTED
- /* Inform the I/O callback that the chunk header is being read.
- * PNG_IO_CHUNK_HDR requires a single I/O call.
- */
png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_HDR;
#endif
- /* Read the length and the chunk name */
+ /* Read the length and the chunk name.
+ * This must be performed in a single I/O call.
+ */
png_read_data(png_ptr, buf, 8);
length = png_get_uint_31(png_ptr, buf);
- /* Put the chunk name into png_ptr->chunk_name */
+ /* Put the chunk name into png_ptr->chunk_name. */
png_memcpy(png_ptr->chunk_name, buf + 4, 4);
- png_debug2(0, "Reading %s chunk, length = %lu",
- png_ptr->chunk_name, length);
+ png_debug2(0, "Reading %s chunk, length = %u",
+ png_ptr->chunk_name, length);
- /* Reset the crc and run it over the chunk name */
+ /* Reset the crc and run it over the chunk name. */
png_reset_crc(png_ptr);
png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
- /* Check to see if chunk name is valid */
+ /* Check to see if chunk name is valid. */
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
#ifdef PNG_IO_STATE_SUPPORTED
- /* Inform the I/O callback that chunk data will (possibly) be read.
- * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls.
- */
png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA;
#endif
{
if (png_ptr == NULL)
return;
+
png_read_data(png_ptr, buf, length);
png_calculate_crc(png_ptr, buf, length);
}
{
png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
}
+
if (i)
{
png_crc_read(png_ptr, png_ptr->zbuf, i);
{
png_chunk_warning(png_ptr, "CRC error");
}
+
else
{
png_chunk_benign_error(png_ptr, "CRC error");
return (0);
}
+
return (1);
}
(PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
need_crc = 0;
}
+
else /* critical */
{
if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
}
#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
+ /* The chunk CRC must be serialized in a single I/O call. */
png_read_data(png_ptr, crc_bytes, 4);
if (need_crc)
crc = png_get_uint_32(crc_bytes);
return ((int)(crc != png_ptr->crc));
}
+
else
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_inflate(png_structp png_ptr, png_bytep 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;
+ /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it can't
+ * even necessarily handle 65536 bytes) because the type uInt is "16 bits or
+ * more". Consequently it is necessary to chunk the input to zlib. This
+ * code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the maximum value
+ * that can be stored in a uInt.) It is possible to set ZLIB_IO_MAX to a
+ * lower value in pngpriv.h and this may sometimes have a performance
+ * advantage, because it forces access of the input data to be separated from
+ * at least some of the use by some period of time.
+ */
+ png_ptr->zstream.next_in = data;
+ /* avail_in is set below from 'size' */
+ png_ptr->zstream.avail_in = 0;
while (1)
{
int ret, avail;
+ /* The setting of 'avail_in' used to be outside the loop, by setting it
+ * inside it is possible to chunk the input to zlib and simply rely on
+ * zlib to advance the 'next_in' pointer. This allows arbitrary amounts o
+ * data to be passed through zlib at the unavoidable cost of requiring a
+ * window save (memcpy of up to 32768 output bytes) every ZLIB_IO_MAX
+ * input bytes.
+ */
+ if (png_ptr->zstream.avail_in == 0 && size > 0)
+ {
+ if (size <= ZLIB_IO_MAX)
+ {
+ /* The value is less than ZLIB_IO_MAX so the cast is safe: */
+ png_ptr->zstream.avail_in = (uInt)size;
+ size = 0;
+ }
+
+ else
+ {
+ png_ptr->zstream.avail_in = ZLIB_IO_MAX;
+ size -= ZLIB_IO_MAX;
+ }
+ }
+
/* Reset the output buffer each time round - we empty it
* after every inflate call.
*/
*/
if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0)
{
+ png_size_t space = avail; /* > 0, see above */
+
if (output != 0 && output_size > count)
{
- int copy = output_size - count;
- if (avail < copy) copy = avail;
+ png_size_t copy = output_size - count;
+
+ if (space < copy)
+ copy = space;
+
png_memcpy(output + count, png_ptr->zbuf, copy);
}
- count += avail;
+ count += space;
}
if (ret == Z_OK)
*/
{
PNG_CONST char *msg;
+#ifdef PNG_CONSOLE_IO_SUPPORTED
+ char umsg[52];
+#endif
if (png_ptr->zstream.msg != 0)
msg = png_ptr->zstream.msg;
+
else
{
-#ifdef PNG_STDIO_SUPPORTED
- char umsg[52];
-
+#ifdef PNG_CONSOLE_IO_SUPPORTED
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_warning(png_ptr, msg);
}
- /* 0 means an error - notice that this code simple ignores
+ /* 0 means an error - notice that this code simply ignores
* zero length compressed chunks as a result.
*/
return 0;
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*/);
+ (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.
*/
#if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \
defined(PNG_USER_CHUNK_MALLOC_MAX)
- else
-#endif
+ else if (expanded_size > 0)
+#else
if (expanded_size > 0)
+#endif
{
/* 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);
+ prefix_size + expanded_size + 1);
if (text != NULL)
{
png_warning(png_ptr, "png_inflate logic error");
png_free(png_ptr, text);
}
+
else
- png_warning(png_ptr, "Not enough memory to decompress chunk");
+ png_warning(png_ptr, "Not enough memory to decompress chunk");
}
}
#ifdef PNG_STDIO_SUPPORTED
char umsg[50];
- png_snprintf(umsg, sizeof umsg, "Unknown zTXt compression type %d",
- comp_type);
+ png_snprintf(umsg, sizeof umsg,
+ "Unknown zTXt compression type %d", comp_type);
png_warning(png_ptr, umsg);
#else
png_warning(png_ptr, "Unknown zTXt compression type");
*/
{
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;
/* Find number of channels */
switch (png_ptr->color_type)
{
+ default: /* invalid, png_set_IHDR calls png_error */
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_PALETTE:
png_ptr->channels = 1;
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_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes);
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
- color_type, interlace_type, compression_type, filter_type);
+ color_type, interlace_type, compression_type, filter_type);
}
/* Read and check the palette */
if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
{
png_warning(png_ptr,
- "Ignoring PLTE chunk in grayscale PNG");
+ "Ignoring PLTE chunk in grayscale PNG");
png_crc_finish(png_ptr, length);
return;
}
+
#ifndef PNG_READ_OPT_PLTE_SUPPORTED
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
}
#endif
- /* If we actually NEED the PLTE chunk (ie for a paletted image), we do
+ /* 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.
{
png_crc_finish(png_ptr, 0);
}
+
#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,
- we have two options: an error abort, or a warning and we
- ignore the data in this chunk (which should be OK, since
- it's considered ancillary for a RGB or RGBA image). */
+ * we have two options: an error abort, or a warning and we
+ * ignore the data in this chunk (which should be OK, since
+ * it's considered ancillary for a RGB or RGBA image).
+ */
if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE))
{
if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)
{
png_chunk_benign_error(png_ptr, "CRC error");
}
+
else
{
png_chunk_warning(png_ptr, "CRC error");
return;
}
}
+
/* Otherwise, we (optionally) emit a warning and use the chunk. */
else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN))
{
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");
{
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 */
+ PNG_UNUSED(info_ptr) /* Quiet compiler warnings about unused info_ptr */
}
#ifdef PNG_READ_gAMA_SUPPORTED
png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_fixed_point igamma;
-#ifdef PNG_FLOATING_POINT_SUPPORTED
- float file_gamma;
-#endif
png_byte buf[4];
png_debug(1, "in png_handle_gAMA");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before gAMA");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid gAMA 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 gAMA chunk");
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
#ifdef PNG_READ_sRGB_SUPPORTED
- && !(info_ptr->valid & PNG_INFO_sRGB)
+ && !(info_ptr->valid & PNG_INFO_sRGB)
#endif
- )
+ )
{
png_warning(png_ptr, "Duplicate gAMA chunk");
png_crc_finish(png_ptr, length);
}
png_crc_read(png_ptr, buf, 4);
+
if (png_crc_finish(png_ptr, 0))
return;
- igamma = (png_fixed_point)png_get_uint_32(buf);
- /* Check for zero gamma */
- if (igamma == 0)
- {
- png_warning(png_ptr,
- "Ignoring gAMA chunk with gamma=0");
- return;
- }
+ igamma = png_get_fixed_point(NULL, buf);
-#ifdef PNG_READ_sRGB_SUPPORTED
+ /* Check for zero gamma or an error. */
+ if (igamma <= 0)
+ {
+ png_warning(png_ptr,
+ "Ignoring gAMA chunk with out of range gamma");
+
+ return;
+ }
+
+# 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");
-#ifdef PNG_CONSOLE_IO_SUPPORTED
+ "Ignoring incorrect gAMA value when sRGB is also present");
+
+# ifdef PNG_CONSOLE_IO_SUPPORTED
fprintf(stderr, "gamma = (%d/100000)", (int)igamma);
-#endif
+# endif
return;
}
-#endif /* PNG_READ_sRGB_SUPPORTED */
+ }
+# 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;
+ /* Gamma correction on read is supported. */
+ png_ptr->gamma = igamma;
# endif
- png_set_gAMA(png_ptr, info_ptr, file_gamma);
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
+ /* And set the 'info' structure members. */
png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
-#endif
}
#endif
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sBIT");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid sBIT 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 sBIT chunk");
}
+
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
{
png_warning(png_ptr, "Duplicate sBIT chunk");
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
truelen = 3;
+
else
truelen = (png_size_t)png_ptr->channels;
}
png_crc_read(png_ptr, buf, truelen);
+
if (png_crc_finish(png_ptr, 0))
return;
png_ptr->sig_bit.blue = buf[2];
png_ptr->sig_bit.alpha = buf[3];
}
+
else
{
png_ptr->sig_bit.gray = 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
png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
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_fixed_point x_white, y_white, x_red, y_red, x_green, y_green, x_blue,
+ y_blue;
png_debug(1, "in png_handle_cHRM");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before cHRM");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid cHRM 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, "Missing PLTE before cHRM");
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
-#ifdef PNG_READ_sRGB_SUPPORTED
- && !(info_ptr->valid & PNG_INFO_sRGB)
-#endif
+# ifdef PNG_READ_sRGB_SUPPORTED
+ && !(info_ptr->valid & PNG_INFO_sRGB)
+# endif
)
{
png_warning(png_ptr, "Duplicate cHRM chunk");
}
png_crc_read(png_ptr, buf, 32);
+
if (png_crc_finish(png_ptr, 0))
return;
- 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;
+ x_white = png_get_fixed_point(NULL, buf);
+ y_white = png_get_fixed_point(NULL, buf + 4);
+ x_red = png_get_fixed_point(NULL, buf + 8);
+ y_red = png_get_fixed_point(NULL, buf + 12);
+ x_green = png_get_fixed_point(NULL, buf + 16);
+ y_green = png_get_fixed_point(NULL, buf + 20);
+ x_blue = png_get_fixed_point(NULL, buf + 24);
+ y_blue = png_get_fixed_point(NULL, buf + 28);
- 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
+ if (x_white == PNG_FIXED_ERROR ||
+ y_white == PNG_FIXED_ERROR ||
+ x_red == PNG_FIXED_ERROR ||
+ y_red == PNG_FIXED_ERROR ||
+ x_green == PNG_FIXED_ERROR ||
+ y_green == PNG_FIXED_ERROR ||
+ x_blue == PNG_FIXED_ERROR ||
+ y_blue == PNG_FIXED_ERROR)
+ {
+ png_warning(png_ptr, "Ignoring cHRM chunk with negative chromaticities");
+ return;
+ }
#ifdef PNG_READ_sRGB_SUPPORTED
if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
+ {
+ if (PNG_OUT_OF_RANGE(x_white, 31270, 1000) ||
+ PNG_OUT_OF_RANGE(y_white, 32900, 1000) ||
+ PNG_OUT_OF_RANGE(x_red, 64000L, 1000) ||
+ PNG_OUT_OF_RANGE(y_red, 33000, 1000) ||
+ PNG_OUT_OF_RANGE(x_green, 30000, 1000) ||
+ PNG_OUT_OF_RANGE(y_green, 60000L, 1000) ||
+ PNG_OUT_OF_RANGE(x_blue, 15000, 1000) ||
+ PNG_OUT_OF_RANGE(y_blue, 6000, 1000))
{
- 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");
+ png_warning(png_ptr,
+ "Ignoring incorrect cHRM value when sRGB is also present");
+
#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",
- 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
+ fprintf(stderr, "wx=%d, wy=%d, rx=%d, ry=%d\n",
+ x_white, y_white, x_red, y_red);
+
+ fprintf(stderr, "gx=%d, gy=%d, bx=%d, by=%d\n",
+ x_green, y_green, x_blue, y_blue);
#endif /* PNG_CONSOLE_IO_SUPPORTED */
- }
- return;
}
+ 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
+ png_set_cHRM_fixed(png_ptr, info_ptr, x_white, y_white, x_red, y_red,
+ x_green, y_green, x_blue, y_blue);
}
#endif
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sRGB");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid sRGB 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 sRGB chunk");
}
png_crc_read(png_ptr, buf, 1);
+
if (png_crc_finish(png_ptr, 0))
return;
intent = buf[0];
+
/* Check for bad intent */
if (intent >= PNG_sRGB_INTENT_LAST)
{
#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
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))
+ if (PNG_OUT_OF_RANGE(info_ptr->gamma, 45500L, 500))
{
png_warning(png_ptr,
- "Ignoring incorrect gAMA value when sRGB is also present");
+ "Ignoring incorrect gAMA value when sRGB is also present");
#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
+ fprintf(stderr, "incorrect gamma=(%d/100000)\n", info_ptr->gamma);
#endif
}
}
#endif /* PNG_READ_gAMA_SUPPORTED */
#ifdef PNG_READ_cHRM_SUPPORTED
-#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 */
+ if (PNG_OUT_OF_RANGE(info_ptr->x_white, 31270, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->y_white, 32900, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->x_red, 64000L, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->y_red, 33000, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->x_green, 30000, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->y_green, 60000L, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->x_blue, 15000, 1000) ||
+ PNG_OUT_OF_RANGE(info_ptr->y_blue, 6000, 1000))
+ {
+ png_warning(png_ptr,
+ "Ignoring incorrect cHRM value when sRGB is also present");
+ }
#endif /* PNG_READ_cHRM_SUPPORTED */
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
png_bytep pC;
png_charp profile;
png_uint_32 skip = 0;
- png_uint_32 profile_size, profile_length;
+ png_uint_32 profile_size;
+ png_alloc_size_t 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");
/* 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)
+ if (profile >= png_ptr->chunkdata + slength - 1)
{
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
/* Compression_type should always be zero */
compression_type = *profile++;
+
if (compression_type)
{
png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
prefix_length = profile - png_ptr->chunkdata;
png_decompress_chunk(png_ptr, compression_type,
- slength, prefix_length, &data_length);
+ slength, prefix_length, &data_length);
profile_length = data_length - prefix_length;
- if ( prefix_length > data_length || profile_length < 4)
+ if (prefix_length > data_length || profile_length < 4)
{
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
/* 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)) );
+ profile_size = ((*(pC )) << 24) |
+ ((*(pC + 1)) << 16) |
+ ((*(pC + 2)) << 8) |
+ ((*(pC + 3)) );
+ /* NOTE: the following guarantees that 'profile_length' fits into 32 bits,
+ * because profile_size is a 32 bit value.
+ */
if (profile_size < profile_length)
profile_length = profile_size;
+ /* And the following guarantees that profile_size == profile_length. */
if (profile_size > profile_length)
{
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
- png_warning(png_ptr, "Ignoring truncated iCCP profile");
#ifdef PNG_STDIO_SUPPORTED
- {
- char umsg[50];
-
- 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);
- }
+ {
+ char umsg[80];
+
+ png_snprintf2(umsg, 80,
+ "Ignoring iCCP chunk with declared size = %u "
+ "and actual length = %u",
+ (unsigned int) profile_size,
+ (unsigned int) profile_length);
+ png_warning(png_ptr, umsg);
+ }
+#else
+ png_warning(png_ptr,
+ "Ignoring iCCP chunk with uncompressed size mismatch");
#endif
return;
}
png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata,
- compression_type, png_ptr->chunkdata + prefix_length, profile_length);
+ compression_type, (png_bytep)png_ptr->chunkdata + prefix_length,
+ profile_size);
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = NULL;
}
{
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 data_length;
+ int entry_size, i;
png_uint_32 skip = 0;
png_size_t slength;
+ png_uint_32 dl;
+ png_size_t max_dl;
png_debug(1, "in png_handle_sPLT");
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");
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_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
+
+ /* WARNING: this may break if size_t is less than 32 bits; it is assumed
+ * that the PNG_MAX_MALLOC_64K test is enabled in this case, but this is a
+ * potential breakage point if the types in pngconf.h aren't exactly right.
+ */
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength);
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 */
new_palette.depth = *entry_start++;
entry_size = (new_palette.depth == 8 ? 6 : 10);
- data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
+ /* This must fit in a png_uint_32 because it is derived from the original
+ * chunk data length (and use 'length', not 'slength' here for clarity -
+ * they are guaranteed to be the same, see the tests above.)
+ */
+ data_length = length - (png_uint_32)(entry_start -
+ (png_bytep)png_ptr->chunkdata);
/* Integrity-check the data length */
if (data_length % entry_size)
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)))
+ dl = (png_int_32)(data_length / entry_size);
+ max_dl = PNG_SIZE_MAX / png_sizeof(png_sPLT_entry);
+
+ if (dl > max_dl)
{
png_warning(png_ptr, "sPLT chunk too long");
return;
}
+
+ new_palette.nentries = (png_int_32)(data_length / entry_size);
+
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");
if (new_palette.depth == 8)
{
- pp->red = *entry_start++;
- pp->green = *entry_start++;
- pp->blue = *entry_start++;
- pp->alpha = *entry_start++;
+ 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->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++;
+ 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[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;
+
+ pp[i].frequency = png_get_uint_16(entry_start); entry_start += 2;
}
#endif
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before tRNS");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid tRNS after IDAT");
png_crc_finish(png_ptr, length);
return;
}
+
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_warning(png_ptr, "Duplicate tRNS chunk");
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_byte buf[6];
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_color.red = png_get_uint_16(buf);
png_ptr->trans_color.green = png_get_uint_16(buf + 2);
png_ptr->trans_color.blue = png_get_uint_16(buf + 4);
}
+
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
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_crc_finish(png_ptr, length);
return;
}
+
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
{
png_warning(png_ptr, "tRNS chunk not allowed with alpha channel");
}
png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
- &(png_ptr->trans_color));
+ &(png_ptr->trans_color));
}
#endif
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before bKGD");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid bKGD after IDAT");
png_crc_finish(png_ptr, length);
return;
}
+
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
- !(png_ptr->mode & PNG_HAVE_PLTE))
+ !(png_ptr->mode & PNG_HAVE_PLTE))
{
png_warning(png_ptr, "Missing PLTE before bKGD");
png_crc_finish(png_ptr, length);
return;
}
+
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
{
png_warning(png_ptr, "Duplicate bKGD chunk");
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
truelen = 1;
+
else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
truelen = 6;
+
else
truelen = 2;
}
png_crc_read(png_ptr, buf, truelen);
+
if (png_crc_finish(png_ptr, 0))
return;
/* We convert the index value into RGB components so that we can allow
* arbitrary RGB values for background when we have transparency, and
* so it is easy to determine the RGB values of the background color
- * from the info_ptr struct. */
+ * from the info_ptr struct.
+ */
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_ptr->background.index = buf[0];
+
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 =
+ 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_ptr->background.green =
(png_uint_16)png_ptr->palette[buf[0]].green;
- png_ptr->background.blue =
+
+ png_ptr->background.blue =
(png_uint_16)png_ptr->palette[buf[0]].blue;
}
}
+
else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
{
png_ptr->background.red =
png_ptr->background.blue =
png_ptr->background.gray = png_get_uint_16(buf);
}
+
else
{
png_ptr->background.red = png_get_uint_16(buf);
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before hIST");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid hIST after IDAT");
png_crc_finish(png_ptr, length);
return;
}
+
else if (!(png_ptr->mode & PNG_HAVE_PLTE))
{
png_warning(png_ptr, "Missing PLTE before hIST");
png_crc_finish(png_ptr, length);
return;
}
+
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
{
png_warning(png_ptr, "Duplicate hIST chunk");
}
num = length / 2 ;
- if (num != (unsigned int) png_ptr->num_palette || num >
- (unsigned int) PNG_MAX_PALETTE_LENGTH)
+
+ 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);
if (!(png_ptr->mode & PNG_HAVE_IHDR))
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_crc_finish(png_ptr, length);
return;
}
+
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
png_warning(png_ptr, "Duplicate pHYs chunk");
}
png_crc_read(png_ptr, buf, 9);
+
if (png_crc_finish(png_ptr, 0))
return;
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before oFFs");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid oFFs after IDAT");
png_crc_finish(png_ptr, length);
return;
}
+
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
{
png_warning(png_ptr, "Duplicate oFFs chunk");
}
png_crc_read(png_ptr, buf, 9);
+
if (png_crc_finish(png_ptr, 0))
return;
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before pCAL");
+
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid pCAL after IDAT");
png_crc_finish(png_ptr, length);
return;
}
+
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
{
png_warning(png_ptr, "Duplicate pCAL chunk");
return;
}
- png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)",
- length + 1);
+ png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)",
+ 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;
- }
+ {
+ png_warning(png_ptr, "No memory for pCAL purpose");
+ return;
+ }
+
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, 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. */
+ * in order to get the parameter information.
+ */
if (endptr <= buf + 12)
{
png_warning(png_ptr, "Invalid pCAL data");
png_debug(3, "Checking pCAL equation type and number of parameters");
/* Check that we have the right number of parameters for known
- equation types. */
+ * equation types.
+ */
if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
(type == PNG_EQUATION_BASE_E && nparams != 3) ||
(type == PNG_EQUATION_ARBITRARY && nparams != 3) ||
png_ptr->chunkdata = NULL;
return;
}
+
else if (type >= PNG_EQUATION_LAST)
{
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
/* Empty loop to move past the units string. */ ;
png_debug(3, "Allocating pCAL parameters array");
+
params = (png_charpp)png_malloc_warn(png_ptr,
- (png_size_t)(nparams * png_sizeof(png_charp)));
+ (png_size_t)(nparams * png_sizeof(png_charp)));
+
if (params == NULL)
- {
- png_free(png_ptr, png_ptr->chunkdata);
- png_ptr->chunkdata = NULL;
- png_warning(png_ptr, "No memory for pCAL params");
- return;
- }
+ {
+ 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", i);
+
for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
/* Empty loop to move past each parameter string */ ;
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_size_t slength, i;
+ int state;
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");
return;
}
- png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)",
+ png_debug1(2, "Allocating and reading sCAL chunk data (%u 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);
+ png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
if (png_crc_finish(png_ptr, 0))
{
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)
+ /* Validate the unit. */
+ if (png_ptr->chunkdata[0] != 1 && png_ptr->chunkdata[0] != 2)
{
- png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
+ png_warning(png_ptr, "Invalid sCAL ignored: invalid unit");
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++;
+ /* Validate the ASCII numbers, need two ASCII numbers separated by
+ * a '\0' and they need to fit exactly in the chunk data.
+ */
+ i = 0;
+ state = 0;
- 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;
- }
+ if (png_ptr->chunkdata[1] == 45 /* negative width */ ||
+ !png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) ||
+ i >= slength || png_ptr->chunkdata[i++] != 0)
+ png_warning(png_ptr, "Invalid sCAL chunk ignored: bad width format");
-#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;
-#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
- png_free(png_ptr, swidth);
-#endif
- 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;
-#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
- png_free(png_ptr, swidth);
-#endif
- 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
- )
+ else
{
- 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_size_t heighti = i;
+ if (png_ptr->chunkdata[i] == 45 /* negative height */ ||
+ !png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) ||
+ i != slength)
+ png_warning(png_ptr, "Invalid sCAL chunk ignored: bad height format");
-#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
+ else
+ /* This is the (only) success case. */
+ png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0],
+ png_ptr->chunkdata+1, png_ptr->chunkdata+heighti);
+ }
+ /* Clean up - just free the temporarily allocated buffer. */
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 (!(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))
{
png_warning(png_ptr, "Duplicate tIME chunk");
}
png_crc_read(png_ptr, buf, 7);
+
if (png_crc_finish(png_ptr, 0))
return;
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_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)png_ptr->chunkdata, slength);
text++;
text_ptr = (png_textp)png_malloc_warn(png_ptr,
- png_sizeof(png_text));
+ 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;
+ 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_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");
+ png_warning(png_ptr, "Insufficient memory to process text chunk");
}
#endif
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");
#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. */
+ * 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_crc_finish(png_ptr, length);
- return;
+ png_warning(png_ptr, "zTXt chunk too large to fit in memory");
+ png_crc_finish(png_ptr, length);
+ return;
}
#endif
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+
if (png_ptr->chunkdata == NULL)
{
- png_warning(png_ptr, "Out of memory processing zTXt chunk");
- return;
+ png_warning(png_ptr, "Out of memory processing zTXt 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;
}
+
else
{
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_decompress_chunk(png_ptr, comp_type,
- (png_size_t)length, prefix_len, &data_len);
+ (png_size_t)length, prefix_len, &data_len);
text_ptr = (png_textp)png_malloc_warn(png_ptr,
- png_sizeof(png_text));
+ 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;
+ 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;
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");
+ png_error(png_ptr, "Insufficient memory to store zTXt chunk");
}
#endif
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");
#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. */
+ * 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;
+ png_warning(png_ptr, "iTXt chunk too large to fit in memory");
+ png_crc_finish(png_ptr, length);
+ return;
}
#endif
png_free(png_ptr, png_ptr->chunkdata);
png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+
if (png_ptr->chunkdata == NULL)
{
- png_warning(png_ptr, "No memory to process iTXt chunk");
- return;
+ 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);
for (lang = png_ptr->chunkdata; *lang; lang++)
/* Empty loop */ ;
+
lang++; /* Skip NUL separator */
/* iTXt must have a language tag (possibly empty), two compression bytes,
png_ptr->chunkdata = NULL;
return;
}
+
else
{
- comp_flag = *lang++;
- comp_type = *lang++;
+ 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)
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");
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);
+ png_decompress_chunk(png_ptr, comp_type,
+ (size_t)length, prefix_len, &data_len);
+
else
- data_len = png_strlen(png_ptr->chunkdata + prefix_len);
+ data_len = png_strlen(png_ptr->chunkdata + prefix_len);
+
text_ptr = (png_textp)png_malloc_warn(png_ptr,
- png_sizeof(png_text));
+ 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;
+ 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);
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");
+ 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
- -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
- case it will be saved away to be written out later. */
+ * 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
+ * -- 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_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");
if (png_ptr->mode & PNG_HAVE_IDAT)
{
PNG_IDAT;
+
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */
png_ptr->mode |= PNG_AFTER_IDAT;
}
{
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
- PNG_HANDLE_CHUNK_ALWAYS
+ PNG_HANDLE_CHUNK_ALWAYS
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
- && png_ptr->read_user_chunk_fn == NULL
+ && png_ptr->read_user_chunk_fn == NULL
#endif
- )
+ )
#endif
- png_chunk_error(png_ptr, "unknown critical chunk");
+ png_chunk_error(png_ptr, "unknown critical chunk");
}
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
#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;
- }
+ 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_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
- {
+
+ 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))
+ 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)
+ 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
+ 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;
+ 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 */
+ PNG_UNUSED(info_ptr) /* Quiet compiler warnings about unused info_ptr */
#endif
}
/* This function is called to verify that a chunk name is valid.
- This function can't have the "critical chunk check" incorporated
- into it, since in the future we will need to be able to call user
- functions to handle unknown critical chunks after we check that
- the chunk name itself is valid. */
+ * This function can't have the "critical chunk check" incorporated
+ * into it, since in the future we will need to be able to call user
+ * functions to handle unknown critical chunks after we check that
+ * the chunk name itself is valid.
+ */
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
void /* PRIVATE */
-png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
+png_check_chunk_name(png_structp png_ptr, png_const_bytep chunk_name)
{
png_debug(1, "in png_check_chunk_name");
if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
}
/* 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 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. */
+ * 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 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 /* PRIVATE */
png_combine_row(png_structp png_ptr, png_bytep row, int mask)
{
png_debug(1, "in png_combine_row");
+
if (mask == 0xff)
{
png_memcpy(row, png_ptr->row_buf + 1,
- PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width));
+ PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width));
}
+
else
{
switch (png_ptr->row_info.pixel_depth)
s_end = 7;
s_inc = 1;
}
+
else
#endif
{
sp++;
dp++;
}
+
else
shift += s_inc;
if (m == 1)
m = 0x80;
+
else
m >>= 1;
}
break;
}
+
case 2:
{
png_bytep sp = png_ptr->row_buf + 1;
s_end = 6;
s_inc = 2;
}
+
else
#endif
{
sp++;
dp++;
}
+
else
shift += s_inc;
+
if (m == 1)
m = 0x80;
+
else
m >>= 1;
}
break;
}
+
case 4:
{
png_bytep sp = png_ptr->row_buf + 1;
s_end = 4;
s_inc = 4;
}
+
else
#endif
{
sp++;
dp++;
}
+
else
shift += s_inc;
+
if (m == 1)
m = 0x80;
+
else
m >>= 1;
}
break;
}
+
default:
{
png_bytep sp = png_ptr->row_buf + 1;
png_uint_32 row_width = png_ptr->width;
png_byte m = 0x80;
-
for (i = 0; i < row_width; i++)
{
if (m & mask)
if (m == 1)
m = 0x80;
+
else
m >>= 1;
}
}
#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)
{
s_end = 0;
s_inc = -1;
}
+
else
#endif
{
{
*dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
+
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
+
else
dshift += s_inc;
}
+
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
+
else
sshift += s_inc;
}
break;
}
+
case 2:
{
png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
s_end = 0;
s_inc = -2;
}
+
else
#endif
{
{
*dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
+
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
+
else
dshift += s_inc;
}
+
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
+
else
sshift += s_inc;
}
break;
}
+
case 4:
{
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
s_end = 0;
s_inc = -4;
}
+
else
#endif
{
{
*dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
+
if (dshift == s_end)
{
dshift = s_start;
dp--;
}
+
else
dshift += s_inc;
}
+
if (sshift == s_end)
{
sshift = s_start;
sp--;
}
+
else
sshift += s_inc;
}
default:
{
png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
+
png_bytep sp = row + (png_size_t)(row_info->width - 1)
* pixel_bytes;
+
png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
int jstop = png_pass_inc[pass];
int j;
png_memcpy(v, sp, pixel_bytes);
+
for (j = 0; j < jstop; j++)
{
png_memcpy(dp, v, pixel_bytes);
dp -= pixel_bytes;
}
+
sp -= pixel_bytes;
}
break;
row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
}
#ifndef PNG_READ_PACKSWAP_SUPPORTED
- transformations = transformations; /* Silence compiler warning */
+ PNG_UNUSED(transformations) /* Silence compiler warning */
#endif
}
#endif /* PNG_READ_INTERLACING_SUPPORTED */
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_const_bytep prev_row, int filter)
{
png_debug(1, "in png_read_filter_row");
- png_debug2(2, "row = %lu, filter = %d", png_ptr->row_number, filter);
+ png_debug2(2, "row = %u, filter = %d", png_ptr->row_number, filter);
switch (filter)
{
case PNG_FILTER_VALUE_NONE:
break;
+
case PNG_FILTER_VALUE_SUB:
{
- png_uint_32 i;
- png_uint_32 istop = row_info->rowbytes;
- png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
+ png_size_t i;
+ png_size_t istop = row_info->rowbytes;
+ unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp = row + bpp;
png_bytep lp = row;
}
case PNG_FILTER_VALUE_UP:
{
- png_uint_32 i;
- png_uint_32 istop = row_info->rowbytes;
+ png_size_t i;
+ png_size_t istop = row_info->rowbytes;
png_bytep rp = row;
- png_bytep pp = prev_row;
+ png_const_bytep pp = prev_row;
for (i = 0; i < istop; i++)
{
}
case PNG_FILTER_VALUE_AVG:
{
- png_uint_32 i;
+ png_size_t i;
png_bytep rp = row;
- png_bytep pp = prev_row;
+ png_const_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;
+ unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
+ png_size_t 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 (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:
{
- png_uint_32 i;
+ png_size_t i;
png_bytep rp = row;
- png_bytep pp = prev_row;
+ png_const_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;
+ png_const_bytep cp = prev_row;
+ unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
+ png_size_t istop=row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
{
/*
if (pa <= pb && pa <= pc)
p = a;
+
else if (pb <= pc)
p = b;
+
else
p = c;
*/
break;
}
default:
- png_warning(png_ptr, "Ignoring bad adaptive filter type");
- *row = 0;
+ png_error(png_ptr, "Ignoring bad adaptive filter type");
+ /*NOT REACHED */
break;
}
}
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
- png_memset(png_ptr->prev_row, 0,
- png_ptr->rowbytes + 1);
+
+ png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+
do
{
png_ptr->pass++;
+
if (png_ptr->pass >= 7)
break;
+
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
if (!(png_ptr->transformations & PNG_INTERLACE))
{
png_ptr->num_rows = (png_ptr->height +
- png_pass_yinc[png_ptr->pass] - 1 -
- png_pass_ystart[png_ptr->pass]) /
- png_pass_yinc[png_ptr->pass];
- if (!(png_ptr->num_rows))
- continue;
+ png_pass_yinc[png_ptr->pass] - 1 -
+ png_pass_ystart[png_ptr->pass]) /
+ png_pass_yinc[png_ptr->pass];
}
+
else /* if (png_ptr->transformations & PNG_INTERLACE) */
- break;
- } while (png_ptr->iwidth == 0);
+ break; /* libpng deinterlacing sees every row */
+
+ } while (png_ptr->num_rows == 0 || png_ptr->iwidth == 0);
if (png_ptr->pass < 7)
return;
png_ptr->zstream.next_out = (Byte *)&extra;
png_ptr->zstream.avail_out = (uInt)1;
+
for (;;)
{
if (!(png_ptr->zstream.avail_in))
{
while (!png_ptr->idat_size)
{
- png_byte chunk_length[4];
-
png_crc_finish(png_ptr, 0);
-
- png_read_data(png_ptr, chunk_length, 4);
- png_ptr->idat_size = png_get_uint_31(png_ptr, chunk_length);
- png_reset_crc(png_ptr);
- png_crc_read(png_ptr, png_ptr->chunk_name, 4);
+ png_ptr->idat_size = png_read_chunk_header(png_ptr);
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
-
}
+
png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_in = png_ptr->zbuf;
+
if (png_ptr->zbuf_size > png_ptr->idat_size)
png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
+
png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in);
png_ptr->idat_size -= png_ptr->zstream.avail_in;
}
+
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
+
if (ret == Z_STREAM_END)
{
if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in ||
- png_ptr->idat_size)
+ png_ptr->idat_size)
png_warning(png_ptr, "Extra compressed data");
+
png_ptr->mode |= PNG_AFTER_IDAT;
png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
break;
}
+
if (ret != Z_OK)
png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
- "Decompression Error");
+ "Decompression Error");
if (!(png_ptr->zstream.avail_out))
{
{
if (!(png_ptr->transformations & PNG_INTERLACE))
png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -
- png_pass_ystart[0]) / png_pass_yinc[0];
+ png_pass_ystart[0]) / png_pass_yinc[0];
+
else
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = (png_ptr->width +
- png_pass_inc[png_ptr->pass] - 1 -
- png_pass_start[png_ptr->pass]) /
- png_pass_inc[png_ptr->pass];
+ png_pass_inc[png_ptr->pass] - 1 -
+ png_pass_start[png_ptr->pass]) /
+ png_pass_inc[png_ptr->pass];
}
+
else
#endif /* PNG_READ_INTERLACING_SUPPORTED */
{
png_ptr->num_rows = png_ptr->height;
png_ptr->iwidth = png_ptr->width;
}
+
max_pixel_depth = png_ptr->pixel_depth;
#ifdef PNG_READ_PACK_SUPPORTED
{
if (png_ptr->num_trans)
max_pixel_depth = 32;
+
else
max_pixel_depth = 24;
}
+
else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
if (max_pixel_depth < 8)
max_pixel_depth = 8;
+
if (png_ptr->num_trans)
max_pixel_depth *= 2;
}
+
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
if (png_ptr->num_trans)
}
#endif
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+ if (png_ptr->transformations & PNG_EXPAND_16)
+ {
+# ifdef PNG_READ_EXPAND_SUPPORTED
+ /* In fact it is an error if it isn't supported, but checking is
+ * the safe way.
+ */
+ if (png_ptr->transformations & PNG_EXPAND)
+ {
+ if (png_ptr->bit_depth < 16)
+ max_pixel_depth *= 2;
+ }
+ else
+# endif
+ png_ptr->transformations &= ~PNG_EXPAND_16;
+ }
+#endif
+
#ifdef PNG_READ_FILLER_SUPPORTED
if (png_ptr->transformations & (PNG_FILLER))
{
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;
}
{
if (
#ifdef PNG_READ_EXPAND_SUPPORTED
- (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
+ (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
#endif
#ifdef PNG_READ_FILLER_SUPPORTED
- (png_ptr->transformations & (PNG_FILLER)) ||
+ (png_ptr->transformations & (PNG_FILLER)) ||
#endif
- png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+ png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (max_pixel_depth <= 16)
max_pixel_depth = 32;
+
else
max_pixel_depth = 64;
}
+
else
{
if (max_pixel_depth <= 8)
- {
- if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ {
+ if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
max_pixel_depth = 32;
- else
+
+ 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;
}
#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*
+ {
+ int user_pixel_depth = png_ptr->user_transform_depth*
png_ptr->user_transform_channels;
- if (user_pixel_depth > max_pixel_depth)
+
+ 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 safety's sake
*/
row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
- 1 + ((max_pixel_depth + 7) >> 3);
+ 1 + ((max_pixel_depth + 7) >> 3);
+
#ifdef PNG_MAX_MALLOC_64K
if (row_bytes > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
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->row_buf = png_ptr->big_row_buf + 32 -
+ (((png_alloc_size_t)png_ptr->big_row_buf + 15) & 0x0F);
+
png_ptr->old_big_row_buf_size = row_bytes + 48;
#else
/* Use 32 bytes of padding before and 16 bytes after row_buf. */
}
#ifdef PNG_MAX_MALLOC_64K
- if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
+ if (png_ptr->rowbytes > 65535)
png_error(png_ptr, "This image requires a row greater than 64KB");
+
#endif
- if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
+ if (png_ptr->rowbytes > (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->prev_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1);
+
png_ptr->old_prev_row_size = png_ptr->rowbytes + 1;
}
png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
- png_debug1(3, "width = %lu,", png_ptr->width);
- png_debug1(3, "height = %lu,", png_ptr->height);
- png_debug1(3, "iwidth = %lu,", png_ptr->iwidth);
- png_debug1(3, "num_rows = %lu,", png_ptr->num_rows);
- png_debug1(3, "rowbytes = %lu,", png_ptr->rowbytes);
+ png_debug1(3, "width = %u,", png_ptr->width);
+ png_debug1(3, "height = %u,", png_ptr->height);
+ png_debug1(3, "iwidth = %u,", png_ptr->iwidth);
+ png_debug1(3, "num_rows = %u,", png_ptr->num_rows);
+ png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes);
png_debug1(3, "irowbytes = %lu",
- PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
+ (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1);
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
projects / l4.git / blobdiff