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Diffstat (limited to 'Build/source/extra/xz/TODO')
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diff --git a/Build/source/extra/xz/TODO b/Build/source/extra/xz/TODO new file mode 100644 index 00000000000..9fac1b34195 --- /dev/null +++ b/Build/source/extra/xz/TODO @@ -0,0 +1,60 @@ + +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 be worked around by using "xz --extreme". However, the presets + need some tweaking and maybe this issue can be minimized without + making the typical case too much slower. + + 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. + + +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. It will possibly be named libzzf. + + lzma_strerror() to convert lzma_ret to human readable form? + This is tricky, because the same error codes are used with + slightly different meanings. + + +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. + |