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|
NEWS for lbzip2 -*- outline -*-
* What's new in lbzip2 2.5
** Bug fixes
Version 2.5 fixes a compressor bug introduced in lbzip2 2.4. This
bug manifests in assertion failure or deadlock when compressing
data.
This version also fixes a performance bug which prevented
sequential compressor from fully utilizing all available threads,
which resultes in very poor performance.
* What's new in lbzip2 2.4
** Bug fixes
Version 2.4 fixes a bug in compression code which could lead to undefined
behavior (usually segmentation fault) when compressing certain kinds
highly-redundant data.
A decompression bug in bz2 header parsing code was fixed. This bug could
cause some valid compressed files to be rejected with "CRC mismatch" error.
** New features
Version 2.4 of lbzip2 introduces sequential mode of operation, which is not
used by default but can be activated with a command-line switch. This new
mode usually improves compression ratio and decreases CPU usage ("user
time") at cost of degraded scalability.
* What's new in lbzip2 2.3
** Bug fixes
Version 2.3 fixes an assertion failure bug that could cause core dumps when
compressing some kind of data.
A bug which prevented symbolic links to be opened in some situations (when
compressing or decompressing files to stdout or when discarding output) was
fixed.
Version 2.3 fixes a bug that caused SIGXFSZ to be handled incorrectly on
32-bit systems.
** New features
When decompressing with both --force and --stdout options given lbzip2 2.3
will simply copy files that are not in bzip2 format (instead of reporting
invalid file format), but will still reject files that appear to be in bzip2
format but are damaged or malformed somehow. This mimics behavior of gzip.
* What's new in lbzip2 2.2
** Bug fixes
In version 2.2 decompressor was made more bzip2-compatible. All valid bzip2
files should now be properly decompressed by lbzip2.
Memory allocation was reduced significantly. Previous versions could
allocate large amounts of memory during decompression and testing of highly
compressed files.
Version 2.2 fixes a bug that caused some legitimate bz2 files to be rejected
during decompression with a CRC error message.
** New features
Compression performance is increased significantly by inclusion of new
block-sorting code using divsufsort algorithm.
** Abandoned features
The new block-sorting algorithm made `--exponential' command-line switch
irrelevant. The switch is retained for compatibility with bzip2 and older
versions of lbzip2, but otherwise has no effect.
File write errors caused by broken pipes or exceeded file size limits are no
longer reported to standard error.
* What's new in lbzip2 2.1
** Bug fixes
Version 2.1 fixes a use-after-free security vulnerability in decompressor
code responsible for displaying progress information.
* What's new in lbzip2 2.0
** Bug fixes
Now lbzip2 creates one compressed stream per bzip2 file instead of multiple
concatenated streams.
lbzip2 now doesn't decompress streams embedded within trailing garbage after
initial sequence of streams.
Now lbzip2 detects and rejects more kinds of invalid bzip2 files (files with
invalid stream CRCs, files with blocks larger than stated in stream headers
and some others).
** New features
Both compression and decompression speed is increased significantly.
When invoked with `-v' or `--verbose' options lbzip2 now displays
information about progress of compression or decompression, provided that
stderr is connected to a terminal.
When invoked with `-v' or `--verbose' options lbzip2 now displays
compression ratio and space savings for each compressed or decompressed
file.
lbzip2 now supports `--exponential' option with the same semantics as
bzip2's one. More information in the manual.
Now lbzip2 displays more detailed messages on decompression failure.
** Changed features
Help and version information is now printed to standard output instead of
standard error stream.
** Abandoned features
Support for tracing memory allocation by setting the environmental
variable `LBZIP2_TRACE_ALLOC' was dropped.
** Other
lbzip2 is now licensed under the terms of GPL v3.0 or any later version.
Former versions used to be released under GPL v2+.
lbzip2 doesn't depend on libbz2 any longer. Now it uses its own
implementation of bzip2 compression and decompression algorithms.
Now lbzip2's build process is managed by the GNU build system.
|
