Function LZ4_compress_default 

pub unsafe extern "C" fn LZ4_compress_default(
    src: *const c_char,
    dst: *mut c_char,
    srcSize: c_int,
    dstCapacity: c_int,
) -> c_int

LZ4_compress_default(): compresses srcSize bytes from src into the dstCapacity byte buffer dst. Returns the number of bytes written to dst, or 0 if compression fails. Compression is guaranteed to succeed if dstCapacity >= LZ4_compressBound(srcSize).