t's a recommended setting.
    If the function cannot compress 'src' into a more limited 'dst' budget,
    compression stops *immediately*, and the function result is zero.
    Note : as a consequence, 'dst' content is not valid.
    Note 2 : This function is protected against buffer overflow scenarios (never writes outside 'dst' buffer, nor read outside 'source' buffer).
        srcSize : max supported value is LZ4_MAX_INPUT_SIZE.
        dstCapacity : size of buffer 'dst' (which must be already allocated)