TODO revision 207842 
1
2XZ Utils To-Do List
3===================
4
5Known bugs
6----------
7
8    The test suite is too incomplete.
9
10    If the memory usage limit is less than about 13 MiB, xz is unable to
11    automatically scale down the compression settings enough even though
12    it would be  possible by switching from BT2/BT3/BT4 match finder to
13    HC3/HC4.
14
15    The code to detect number of CPU cores doesn't count hyperthreading
16    as multiple cores. In context of xz, it probably should.
17    Hyperthreading is good at least with p7zip.
18
19    XZ Utils compress some files significantly worse than LZMA Utils.
20    This is due to faster compression presets used by XZ Utils, and
21    can be worked around by using "xz --extreme". However, the presets
22    need some tweaking and maybe this issue can be minimized without
23    making the typical case too much slower.
24
25    xz doesn't quote unprintable characters when it displays file names
26    given on the command line.
27
28    tuklib_exit() doesn't block signals => EINTR is possible.
29
30
31Missing features
32----------------
33
34    xz doesn't support copying extended attributes, access control
35    lists etc. from source to target file.
36
37    Multithreaded compression
38
39    Multithreaded decompression
40
41    Buffer-to-buffer coding could use less RAM (especially when
42    decompressing LZMA1 or LZMA2).
43
44    I/O library is not implemented. It will possibly be named libzzf.
45
46    lzma_strerror() to convert lzma_ret to human readable form?
47    This is tricky, because the same error codes are used with
48    slightly different meanings.
49
50
51Documentation
52-------------
53
54    Some tutorial is needed for liblzma. I have planned to write some
55    extremely well commented example programs, which would work as
56    a tutorial. I suppose the Doxygen tags are quite OK as a quick
57    reference once one is familiar with the liblzma API.
58
59    Document the LZMA1 and LZMA2 algorithms.
60
61