public static extern size_t ZSTD_compress_usingCDict(ZStdCompressionHandle cctx, IntPtr dst, size_t dstCapacity, IntPtr src, size_t srcSize, IntPtr cdict);
public static extern size_t ZSTD_compressCCtx(ZStdCompressionHandle ctx, IntPtr dst, size_t dstCapacity, IntPtr src, size_t srcSize, int compressionLevel);