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[libpng16] Fixed incorrect warning of excess deflate data. End condition - the

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warning would be produced if the end of the deflate stream wasn't read
in the last row.  The warning is harmless.
This commit is contained in:
John Bowler
2013-04-07 21:37:52 -05:00
committed by Glenn Randers-Pehrson
parent 7a498039c5
commit 5a1ce92c0c
3 changed files with 18 additions and 9 deletions
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7
ANNOUNCE
View File

@@ -1,5 +1,5 @@
Libpng 1.7.0beta07 - April 1, 2013 Libpng 1.7.0beta07 - April 8, 2013
This is not intended to be a public release. It will be replaced This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version. within a few weeks by a public version or by another test version.
@@ -236,8 +236,11 @@ Version 1.7.0beta06 [March 13, 2013]
technically valid, although a reasonable treatment of division would technically valid, although a reasonable treatment of division would
show it to be incorrect. show it to be incorrect.
Version 1.7.0beta07 [April 1, 2013] Version 1.7.0beta07 [April 8, 2013]
Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling. Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
Fixed incorrect warning of excess deflate data. End condition - the
warning would be produced if the end of the deflate stream wasn't read
in the last row. The warning is harmless.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

5
CHANGES
View File

@@ -4523,8 +4523,11 @@ Version 1.7.0beta06 [March 13, 2013]
technically valid, although a reasonable treatment of division would technically valid, although a reasonable treatment of division would
show it to be incorrect. show it to be incorrect.
Version 1.7.0beta07 [April 1, 2013] Version 1.7.0beta07 [April 8, 2013]
Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling. Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
Fixed incorrect warning of excess deflate data. End condition - the
warning would be produced if the end of the deflate stream wasn't read
in the last row. The warning is harmless.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

15
pngrutil.c
View File

@@ -3962,7 +3962,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
png_ptr->zstream.avail_out = out; png_ptr->zstream.avail_out = out;
} }
else /* check for end */ else /* after last row, checking for end */
{ {
png_ptr->zstream.next_out = tmpbuf; png_ptr->zstream.next_out = tmpbuf;
png_ptr->zstream.avail_out = (sizeof tmpbuf); png_ptr->zstream.avail_out = (sizeof tmpbuf);
@@ -3977,10 +3977,13 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
*/ */
ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
/* Take the unconsumed output back (so, in the 'check' case this just /* Take the unconsumed output back. */
* counts up). if (output != NULL)
*/ avail_out += png_ptr->zstream.avail_out;
avail_out += png_ptr->zstream.avail_out;
else /* avail_out counts the extra bytes */
avail_out += (sizeof tmpbuf) - png_ptr->zstream.avail_out;
png_ptr->zstream.avail_out = 0; png_ptr->zstream.avail_out = 0;
if (ret == Z_STREAM_END) if (ret == Z_STREAM_END)
@@ -4019,7 +4022,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
if (output != NULL) if (output != NULL)
png_error(png_ptr, "Not enough image data"); png_error(png_ptr, "Not enough image data");
else /* checking */ else /* the deflate stream contained extra data */
png_chunk_benign_error(png_ptr, "Too much image data"); png_chunk_benign_error(png_ptr, "Too much image data");
} }
} }