#define SIZE 1240
+/**
+ * Check if at the current position there is a valid looking termination
+ * @param version version 0 requires the decoder to know the data size in bytes
+ * version 1 needs about 1 bit more space but does not need to
+ * carry the size from encoder to decoder
+ * @returns negative AVERROR code on error or non negative.
+ */
+static int rac_check_termination(RangeCoder *c, int version)
+{
+ if (version == 1) {
+ RangeCoder tmp = *c;
+ get_rac(c, (uint8_t[]) { 129 });
+
+ if (c->bytestream == tmp.bytestream && c->bytestream > c->bytestream_start)
+ tmp.low -= *--tmp.bytestream;
+ tmp.bytestream_end = tmp.bytestream;
+
+ if (get_rac(&tmp, (uint8_t[]) { 129 }))
+ return AVERROR_INVALIDDATA;
+ } else {
+ if (c->bytestream_end != c->bytestream)
+ return AVERROR_INVALIDDATA;
+ }
+ return 0;
+}
+
int main(void)
{
RangeCoder c;
return 1;
}
- if (ff_rac_check_termination(&c, version) < 0) {
+ if (rac_check_termination(&c, version) < 0) {
av_log(NULL, AV_LOG_ERROR, "rac failure at termination pass %d version %d\n", p, version);
return 1;
}