xxh64_update
xxh64_update(&dctx->xxhstate, data, length);
xxh64_update(&ctx->xxh64, data, len);
int xxh64_update(struct xxh64_state *state, const void *input, size_t length);
EXPORT_SYMBOL(xxh64_update);
xxh64_update(&cctx->xxhState, src, srcSize);
xxh64_update(&cctx->xxhState, src, srcSize);
if (dctx->validateChecksum) xxh64_update(&dctx->xxhState, dst, rSize);
xxh64_update(&dctx->xxhState, op, decodedSize);