XZ Utils To-Do List =================== Known bugs ---------- The test suite is too incomplete. If the memory usage limit is less than about 13 MiB, xz is unable to automatically scale down the compression settings enough even though it would be possible by switching from BT2/BT3/BT4 match finder to HC3/HC4. The code to detect number of CPU cores doesn't count hyperthreading as multiple cores. In context of xz, it probably should. Hyperthreading is good at least with p7zip. XZ Utils compress some files significantly worse than LZMA Utils. This is due to faster compression presets used by XZ Utils, and can often be worked around by using "xz --extreme". With some files --extreme isn't enough though: it's most likely with files that compress extremely well, so going from compression ratio of 0.003 to 0.004 means big relative increase in the compressed file size. xz doesn't quote unprintable characters when it displays file names given on the command line. tuklib_exit() doesn't block signals => EINTR is possible. SIGTSTP is not handled. If xz is stopped, the estimated remaining time and calculated (de)compression speed won't make sense in the progress indicator (xz --verbose). Missing features ---------------- xz doesn't support copying extended attributes, access control lists etc. from source to target file. Multithreaded compression Multithreaded decompression Buffer-to-buffer coding could use less RAM (especially when decompressing LZMA1 or LZMA2). I/O library is not implemented (similar to gzopen() in zlib). It will be a separate library that supports uncompressed, .gz, .bz2, .lzma, and .xz files. lzma_strerror() to convert lzma_ret to human readable form? This is tricky, because the same error codes are used with slightly different meanings, and this cannot be fixed anymore. Documentation ------------- Some tutorial is needed for liblzma. I have planned to write some extremely well commented example programs, which would work as a tutorial. I suppose the Doxygen tags are quite OK as a quick reference once one is familiar with the liblzma API. Document the LZMA1 and LZMA2 algorithms.