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[libpng17] Treat CRC error handling with png_set_crc_action(), instead of with

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png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
This commit is contained in:
Glenn Randers-Pehrson 2014-02-27 15:40:30 -06:00
parent 1345c5bff8
commit 43cd0a0bb5
3 changed files with 14 additions and 19 deletions
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2
ANNOUNCE
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@ -566,6 +566,8 @@ Version 1.7.0beta33 [February 27, 2014]
and PNG_USR_CONFIG -> PNG_USER_CONFIG).
Version 1.7.0beta34 [February 27, 2014]
Treat CRC error handling with png_set_crc_action(), instead of with
png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

2
CHANGES
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@ -4855,6 +4855,8 @@ Version 1.7.0beta33 [February 27, 2014]
and PNG_USR_CONFIG -> PNG_USER_CONFIG).
Version 1.7.0beta34 [February 27, 2014]
Treat CRC error handling with png_set_crc_action(), instead of with
png_set_benign_errors(), which has been the case since libpng-1.6.0beta18.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

29
pngrutil.c
View File

@ -59,7 +59,11 @@ png_get_uint_32)(png_const_bytep buf)
return PNG_U32(buf[0], buf[1], buf[2], buf[3]);
}
/* Grab a signed 32-bit integer from a buffer in big-endian format. */
/* 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_const_bytep buf)
{
@ -206,10 +210,7 @@ png_crc_finish(png_structrp png_ptr, png_uint_32 skip)
}
else
{
png_chunk_benign_error(png_ptr, "CRC error");
return (0);
}
png_chunk_error(png_ptr, "CRC error");
return (1);
}
@ -293,16 +294,11 @@ png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn)
else if (warn < 2) /* else silent */
{
#ifdef PNG_WARNINGS_SUPPORTED
if (warn)
png_chunk_warning(png_ptr, "insufficient memory to read chunk");
else
#endif
{
#ifdef PNG_ERROR_TEXT_SUPPORTED
png_chunk_error(png_ptr, "insufficient memory to read chunk");
#endif
}
}
}
@ -965,15 +961,10 @@ png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
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");
}
return;
else
{
png_chunk_warning(png_ptr, "CRC error");
return;
}
png_chunk_error(png_ptr, "CRC error");
}
/* Otherwise, we (optionally) emit a warning and use the chunk. */
@ -2815,7 +2806,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr,
/* Use the default handling, note that if there is per-chunk
* handling specified it has already been set into 'keep'.
*
* NOTE: this is an API change in 1.7.0, prior to 1.7.0 libpng
* NOTE: this is an API change in 1.7.0. Prior to 1.7.0 libpng
* would force keep to PNG_HANDLE_CHUNK_IF_SAFE at this point,
* and 1.6.0 would issue a warning if this caused a default of
* discarding the chunk to be changed.