lz4_compress
compressed_size = lz4_compress(uncompressed, compressed,
compressedSize = lz4_compress(uncompressed, compressed,
lz4_compress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n);
extern size_t lz4_compress(void *, void *, size_t, size_t, int);
extern size_t lz4_compress(void *src, void *dst, size_t s_len, size_t d_len,
{"lz4", 0, lz4_compress, lz4_decompress}