Determine VOC block length when length field is zero, fixes issue1538.

Originally committed as revision 20596 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 5 insertions, 0 deletions

diff --git a/libavformat/vocdec.c b/libavformat/vocdec.c
index 94fbd7b9bf..246dbd91b4 100644
--- a/libavformat/vocdec.c
+++ b/libavformat/vocdec.c
@@ -76,6 +76,11 @@ voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
         if (type == VOC_TYPE_EOF)
             return AVERROR(EIO);
         voc->remaining_size = get_le24(pb);
+        if (!voc->remaining_size) {
+            if (url_is_streamed(s->pb))
+                return AVERROR(EIO);
+            voc->remaining_size = url_fsize(pb) - url_ftell(pb);
+        }
         max_size -= 4;
 
         switch (type) {