mirror of https://git.tukaani.org/xz.git
57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
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XZ Utils To-Do List
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===================
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Known bugs
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----------
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The test suite is too incomplete.
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If the memor usage limit is less than about 13 MiB, xz is unable to
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automatically scale down the compression settings enough even though
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it would be possible by switching from BT2/BT3/BT4 match finder to
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HC3/HC4.
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The code to detect number of CPU cores doesn't count hyperthreading
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as multiple cores. In context of xz, it probably should.
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Hyperthreading is good at least with p7zip.
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XZ Utils compress some files significantly worse than LZMA Utils.
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This is due to faster compression presets used by XZ Utils, and
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can be worked around by using "xz --extreme". However, the presets
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need some tweaking and maybe this issue can be minimized without
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making the typical case too much slower.
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Missing features
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----------------
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"xz --list"
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xz could create sparse files when decompressing. (Some prototyping
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has been done.)
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xz doesn't support copying extended attributes, access control
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lists etc. from source to target file.
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Multithreaded compression
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Multithreaded decompression
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Buffer-to-buffer coding could use less RAM (especially when
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decompressing LZMA1 or LZMA2).
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I/O library is not implemented. It will possibly be named libzzf.
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Documentation
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-------------
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Some tutorial is needed for liblzma. I have planned to write some
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extremely well commented example programs, which would work as
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a tutorial. I suppose the Doxygen tags are quite OK as a quick
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reference once one is familiar with the liblzma API.
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Document the LZMA1 and LZMA2 algorithms.
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