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Some BMP files have file size declared in the header equal to headers size

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without image data, so try to correct that value before conducting checks on
declared file size.

Originally committed as revision 15924 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2008-11-24 11:24:02 +00:00
parent e282307b21
commit c5b2fe165a
1 changed files with 10 additions and 6 deletions
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16
libavcodec/bmp.c
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@ -73,18 +73,22 @@ static int bmp_decode_frame(AVCodecContext *avctx,
buf += 2; /* reserved2 */
hsize = bytestream_get_le32(&buf); /* header size */
if(fsize <= hsize){
av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
fsize, hsize);
return -1;
}
ihsize = bytestream_get_le32(&buf); /* more header size */
if(ihsize + 14 > hsize){
av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
return -1;
}
/* sometimes file size is set to some headers size, set a real size in that case */
if(fsize == 14 || fsize == ihsize + 14)
fsize = buf_size - 2;
if(fsize <= hsize){
av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
fsize, hsize);
return -1;
}
switch(ihsize){
case 40: // windib v3
case 64: // OS/2 v2