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Some compression programs are able to handle various compression formats (e.g. `gzip' can decompress files created by `compress', `xz' is able to handle lzma, etc.) Tar tries to use such programs for decompression if the principal decompressor cannot be started. * src/buffer.c (compress_type): Swap ct_none and ct_tar. (archive_compression_type): New static variable. (zip_magic): Remove program and option fields. (zip_program): New structure and static. (compress_program): Remove macro. (find_zip_program): New static function. (first_decompress_program,next_decompress_program): New functions. (open_compressed_archive): Set archive_compression_type instead of use_compress_program_option. * src/common.h (first_decompress_program) (next_decompress_program): New functions. (WARN_DECOMPRESS_PROGRAM): New flag. (WARN_VERBOSE_WARNINGS): Include WARN_DECOMPRESS_PROGRAM. * src/warning.c (warning_args): Add "decompress-program". (warning_types): Add WARN_DECOMPRESS_PROGRAM. * src/system.c (run_decompress_program): New function. (sys_child_open_for_uncompress): Use run_decompress_program instead of calling execlp directly.