static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid) { if (size != 16) return -1; if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul)) get_buffer(pb, cryptocontext->source_container_ul, 16); return 0; }