UCL is written in ANSI C. Both the source code and the compressed data format are designed to be portable across platforms. UCL implements a number of algorithms with the following features: * Decompression is simple and *very* fast. * Requires no memory for decompression. * The decompressors can be squeezed into less than 200 bytes of code. * Focuses on compression levels for generating pre-compressed data which achieve a quite competitive compression ratio. * Allows you to dial up extra compression at a speed cost in the compressor. The speed of the decompressor is not reduced. * Algorithm is thread safe. * Algorithm is lossless. UCL supports in-place decompression.