/* This opens the compressor, either in compress mode or decompress
mode. FileFd is always the compressor input/output file,
OutFd is the created pipe, Input for Compress, Output for Decompress. */
/* This opens the compressor, either in compress mode or decompress
mode. FileFd is always the compressor input/output file,
OutFd is the created pipe, Input for Compress, Output for Decompress. */