static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
int max_size, uint64_t *number)
{
- int len_mask = 0x80, read = 1, n = 1;
- int64_t total = 0;
+ int read = 1, n = 1;
+ uint64_t total = 0;
/* The first byte tells us the length in bytes - get_byte() can normally
* return 0, but since that's not a valid first ebmlID byte, we can
}
/* get the length of the EBML number */
- while (read <= max_size && !(total & len_mask)) {
- read++;
- len_mask >>= 1;
- }
+ read = 8 - ff_log2_tab[total];
if (read > max_size) {
int64_t pos = url_ftell(pb) - 1;
av_log(matroska->ctx, AV_LOG_ERROR,
}
/* read out length */
- total &= ~len_mask;
+ total ^= 1 << ff_log2_tab[total];
while (n++ < read)
total = (total << 8) | get_byte(pb);