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Update TODO.

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Lasse Collin 2014-09-14 21:02:41 +03:00
parent 6b5e3b9eff
commit 642f856bb8
1 changed files with 34 additions and 4 deletions
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38
TODO
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@ -36,6 +36,15 @@ Known bugs
Missing features
----------------
Add support for storing metadata in .xz files. A preliminary
idea is to create a new Stream type for metadata. When both
metadata and data are wanted in the same .xz file, two or more
Streams would be concatenated.
The state stored in lzma_stream should be cloneable, which would
be mostly useful when using a preset dictionary in LZMA2, but
it may have other uses too. Compare to deflateCopy() in zlib.
Support LZMA_FINISH in raw decoder to indicate end of LZMA1 and
other streams that don't have an end of payload marker.
@ -68,14 +77,35 @@ Missing features
This is tricky, because the same error codes are used with
slightly different meanings, and this cannot be fixed anymore.
Make it possible to adjust LZMA2 options in the middle of a Block
so that the encoding speed vs. compression ratio can be optimized
when the compressed data is streamed over network.
Improved BCJ filters. The current filters are small but they aren't
so great when compressing binary packages that contain various file
types. Specifically, they make things worse if there are static
libraries or Linux kernel modules. The filtering could also be
more effective (without getting overly complex), for example,
streamable variant BCJ2 from 7-Zip could be implemented.
Filter that autodetects specific data types in the input stream
and applies appropriate filters for the corrects parts of the input.
Perhaps combine this with the BCJ filter improvement point above.
Long-range LZ77 method as a separate filter or as a new LZMA2
match finder.
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.
More tutorial programs are needed for liblzma.
Document the LZMA1 and LZMA2 algorithms.
Miscellaneous
------------
Try to get the media type for .xz registered at IANA.