#include "libavcodec/rangecoder.h"
-#define SIZE 10240
+#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;
- uint8_t b[9 * SIZE];
+ uint8_t b[9 * SIZE] = {0};
uint8_t r[9 * SIZE];
- int i;
+ int i, p, actual_length, version;
uint8_t state[10];
AVLFG prng;
av_lfg_init(&prng, 1);
+ for (version = 0; version < 2; version++) {
+ for (p = 0; p< 1024; p++) {
+ ff_init_range_encoder(&c, b, SIZE);
+ ff_build_rac_states(&c, (1LL << 32) / 20, 128 + 64 + 32 + 16);
- ff_init_range_encoder(&c, b, SIZE);
- ff_build_rac_states(&c, (1LL << 32) / 20, 128 + 64 + 32 + 16);
+ memset(state, 128, sizeof(state));
- memset(state, 128, sizeof(state));
+ for (i = 0; i < SIZE; i++)
+ r[i] = av_lfg_get(&prng) % 7;
- for (i = 0; i < SIZE; i++)
- r[i] = av_lfg_get(&prng) % 7;
+ for (i = 0; i < SIZE; i++)
+ put_rac(&c, state, r[i] & 1);
- for (i = 0; i < SIZE; i++)
- put_rac(&c, state, r[i] & 1);
+ actual_length = ff_rac_terminate(&c, version);
- ff_rac_terminate(&c, 0);
+ ff_init_range_decoder(&c, b, version ? SIZE : actual_length);
- ff_init_range_decoder(&c, b, SIZE);
+ memset(state, 128, sizeof(state));
- memset(state, 128, sizeof(state));
+ for (i = 0; i < SIZE; i++)
+ if ((r[i] & 1) != get_rac(&c, state)) {
+ av_log(NULL, AV_LOG_ERROR, "rac failure at %d pass %d version %d\n", i, p, version);
+ return 1;
+ }
- for (i = 0; i < SIZE; i++)
- if ((r[i] & 1) != get_rac(&c, state)) {
- av_log(NULL, AV_LOG_ERROR, "rac failure at %d\n", i);
- return 1;
+ 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;
+ }
+ if (c.bytestream - c.bytestream_start - actual_length != version) {
+ av_log(NULL, AV_LOG_ERROR, "rac failure at pass %d version %d\n", p, version);
+ return 1;
+ }
}
+ }
return 0;
}