static int get_metadata_size(const uint8_t *buf, int buf_size) { int metadata_last, metadata_size; const uint8_t *buf_end = buf + buf_size; buf += 4; do { ff_flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size); buf += 4; if (buf + metadata_size > buf_end) { /* need more data in order to read the complete header */ return 0; } buf += metadata_size; } while (!metadata_last); return buf_size - (buf_end - buf); }