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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 21:33:30 -05:00
committed by Glenn Randers-Pehrson
parent 2e0c5f0dff
commit 43c07e1b48
3 changed files with 18 additions and 9 deletions
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15
pngrutil.c
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@@ -3983,7 +3983,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
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.avail_out = (sizeof tmpbuf);
@@ -3998,10 +3998,13 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
*/
ret = inflate(&png_ptr->zstream, Z_NO_FLUSH);
/* Take the unconsumed output back (so, in the 'check' case this just
* counts up).
*/
avail_out += png_ptr->zstream.avail_out;
/* Take the unconsumed output back. */
if (output != NULL)
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;
if (ret == Z_STREAM_END)
@@ -4040,7 +4043,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output,
if (output != NULL)
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");
}
}