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png: Be more informative regarding signature errors 

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2015-07-31 14:24:08 +02:00
parent 14e5580246
commit 4fee11ab05
1 changed files with 17 additions and 3 deletions
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20
libavcodec/pngdec.c
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@ -18,6 +18,8 @@
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
@ -414,9 +416,21 @@ static int decode_frame(AVCodecContext *avctx,
int ret;
/* check signature */
if (buf_size < 8 ||
(memcmp(buf, ff_pngsig, 8) != 0 && memcmp(buf, ff_mngsig, 8) != 0)) {
av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature (%d).\n", buf_size);
if (buf_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Not enough data %d\n",
buf_size);
return AVERROR_INVALIDDATA;
}
if (memcmp(buf, ff_pngsig, 8) != 0 &&
memcmp(buf, ff_mngsig, 8) != 0) {
char signature[5 * 8 + 1] = { 0 };
int i;
for (i = 0; i < 8; i++) {
av_strlcatf(signature + i * 5, sizeof(signature) - i * 5,
" 0x%02x", buf[i]);
}
av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature %s\n",
signature);
return AVERROR_INVALIDDATA;
}