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Topic: Bzip2

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LZMA

PPM compression algorithm

	Bzip2
		bzip2 compresses most files more effectively than more traditional gzip or Zip, but is generally somewhat slower and less efficient in limited-memory situations.
		Indeed, according to the author, bzip2 gets within ten to fifteen percent of the "best" class of compression algorithms currently known (PPM[?]), although it is roughly twice as fast at compression and six times faster at decompression.
		In bzip2 the blocks are all the same size in plaintext, which can be selected by a command-line argument, and are marked in compresstext by bit-sequences derived from the decimal representation of pi.
	www.ebroadcast.com.au /lookup/encyclopedia/bz/Bzip2.html (162 words)

	YoLinux.com Manpage: bzip2
		In this case, bzip2 will decline to write com- pressed output to a terminal, as this would be entirely incomprehensi- ble and therefore pointless.
		bzip2, bunzip2 and bzcat are really the same program, and the decision about what actions to take is done on the basis of which name is used.
		bzip2 usually allocates several megabytes of memory to operate in, and then charges all over it in a fairly random fashion.
	node1.yo-linux.com /cgi-bin/man2html?cgi_command=bzip2 (2158 words)

	Info Node: (bzip2.info)Top
		`bzip2' is built on top of `libbzip2', a flexible library for handling compressed data in the `bzip2' format.
		If `bzip2' tells you your file is corrupted on decompression, and you obtained the file via FTP, there is a possibility that you forgot to tell FTP to do a binary mode transfer.
		If you want to use the `bzip2' algorithms to compress small blocks of data, 64k bytes or smaller, for example on an on-the-fly disk compressor, you'd be well advised not to use this library.
	www.fifi.org /cgi-bin/info2www?(bzip2) (10226 words)

	Bzip2 - Wikipedia, the free encyclopedia
		In some cases, bzip2 is surpassed by 7z and RAR formats in terms of absolute compression efficiency.
		In bzip2 the blocks are all the same size in plaintext, which can be selected by a command-line argument, and are marked in compresstext by an arbitrary bit sequence derived from the decimal representation of π.
		In Unix, bzip2 can be used combined with or independently of tar: bzip2 file to compress and bzip2 -d file.bz2 to uncompress (the alias bunzip2 for decompression may also be used).
	en.wikipedia.org /wiki/Bzip2 (404 words)

	The bzip2 and libbzip2 home page
		If you are trying to restore compressed data from a backup tape or disk, and that data contains some errors, bzip2 may still be able to decompress those parts of the file which are undamaged.
		The bzip2 program itself is a client of the library.
		The bzip2 program is now merely a wrapper on top of the library.
	www.digistar.com /bzip2 (1486 words)

	bzip2(1) - a block-sorting file compressor, v1.0.2 bzcat
		bzip2 will decline to write compressed output to a terminal, as this would be entirely incomprehensible and therefore pointless.
		If a media or transmission error causes a multi-block.bz2 file to become damaged, it may be possible to recover data from the undamaged blocks in the file.
		bzip2 -t to test the integrity of the resulting files, and decompress those which are undamaged.
	www.gsp.com /cgi-bin/man.cgi?section=1&topic=bzip2 (2071 words)

	The bzip2 Command
		The bzip2 command is used for compressing and decompressing files.
		The only disadvantage of bzip2 is that it is somewhat slower than gzip and zip.
		It is often convenient to store a number of files in a compressed archive, which is a single file that contains any number of individual files plus information to allow them to be restored to their original form by one or more extraction programs.
	www.bellevuelinux.org /bzip2.html (771 words)

	MacBzip2 Home Page
		MacBzip2 0.0b2: Julian Seward's bzip2 ported to the Macintosh by SPDsoft.
		bzip2 is very similar to gzip in it's origin and usage; and the same applies to MacBzip2, so you should read MacGzip pages, I won't repeat here all that information...
		bzip2 code passes the tests included with bzip2 sources; and Macintosh code has been tested a lot on MacGzip; but I can't be sure it works on every situation.
	persephone.cps.unizar.es /~spd/bzip2 (466 words)

	BZIP2 for VMS - File Compression/Expansion Utility
		bzip2 is a freely available, patent free [(see README in the distribution kit)], high-quality data compressor.
		BZIP2 is a UNIX-oriented utility, and as such, it has little hope of dealing well with RMS files whose record format is anything other than Stream_LF.
		This may be useful in cases where the BZIP2 object library is to be used with another application which is built using IEEE floating-point formats, but there's no need to change or replace any builder files in this kit.
	antinode.org /dec/sw/bzip2.html (429 words)

	Bzip2 Filters
		The bzip2 Filters are DualUseFilters so that they may be used for either input or output.
		The bzip2 Filters were influences by the work of Jeff Garland ([Garland]) and Jonathan de Halleux ([de Halleux]).
		The bzip2 Filters depend on the third-party libbz2 library, which is not included in the Boost distribution.
	www.boost.org /libs/iostreams/doc/classes/bzip2.html (528 words)

	Installing Bzip2-1.0.1 - Andamooka Reader (Site not responding. Last check: 2007-11-03)
		Although it's not strictly a part of a basic LFS system it's worth mentioning that a patch for Tar can be downloaded which enables the tar program to compress and uncompress using bzip2/bunzip2 easily.
		With a plain tar, you have to use constructions like bzcat file.tar.bztar xv or tar --use-compress-prog=bunzip2 -xvf file.tar.bz2 to use bzip2 and bunzip2 with tar.
		This will cause bzip2 to be built using a different Makefile file, in this case the Makefile-libbz2_so file which creates a dynamic libbz2.so library and links the bzip2 utilities against it.
	www.andamooka.org /reader.pl?pgid=lfsch06_bzip2 (301 words)

	gzip vs. bzip2 (by Jeremy Zawodny)
		It's clear that bzip2 produces smaller compressed files but it does so at a very big cost--especially if you're thinking of using it in an application that requires frequent decompression.
		I knew bzip2 was tighter compression, and I was vaguly aware that it was more CPU intensive.
		It seems like the catch22 with bzip2 is that for personal use you only really care about saving the space if the file is godawful huge, in which case the time required to compress is rather prohibitive (at least to us lazy people who want the computer done NOW).
	jeremy.zawodny.com /blog/archives/000953.html (1697 words)

	bzip2
		The block size affects both the compression ratio achieved, and the amount of memory needed for 100k + (2.5 x block size) Larger block sizes give rapidly diminishing marginal returns.
		Each block bzip2recover takes a single argument, the name of the damaged file, and writes a number of files "rec00001file.bz2", "rec00002file.bz2", etc, containing the extracted blocks.
		If you do not have your own linux server, you can get a shell account through us and learn UNIX quickly.
	www.ctssn.com /man/man.cgi?bzip2 (1730 words)

	SGI Freeware: bzip2 1.0.1 (Site not responding. Last check: 2007-11-03)
		Compression is generally better than that achieved by more conventional LZ77/LZ78-based compressors, and approaches the performance of the PPM family of statistical compressors.
		Depending on your case, it may be worth it (or not) to invest the extra time in compressing/decompressing with bzip2 instead of the more standard gzip to gain a small advantage in multiple download times, etc.
		For the curious, here are some running times and compressed file sizes numbers for comparison.
	freeware.sgi.com /Installable/bzip2-1.0.1.html (149 words)

	Bzip2 mini-HOWTO
		Bzip2 is a groovy new algorithm for compressing data.
		The bzip2 manual, which includes low-level information about the library, can be found here.
		David Fetter added bzip2 support :) ;; ;; If you are concerned about the stderr output of gzip and other ;; compression/decompression programs showing up in your buffers, you @@ -121,7 +121,9 @@ ;;; I have this defined so that.Z files are assumed to be in unix -;;; compress format; and.gz files, in gzip format.
	www.ibiblio.org /pub/Linux/docs/HOWTO/other-formats/html_single/Bzip2.html (1525 words)

	Linux: Kernel Compression With bzip2
		The patch adds the option to use bzip2 compression for both the kernel image as well as for the ramdisk image (initrd), offering better compression than gzip at the expense of consuming more RAM during the boot time decompression process (8 MB versus 2 MB).
		The newer and highly portable bzip2 uses the Burrows-Wheeler block-sorting text compression algorithm and Huffman coding, and is thought to be [3] patent-free by its author, Julian Seward.
		It is a port and cleanup of an earlier patch by Tom Oehser [5] for the 2.2 kernel series.
	kerneltrap.org /node/325/print (616 words)

	Bzip2 - Wikipedia
		bzip2 ist ein frei verfügbares Komprimierungsprogramm zur verlustfreien Kompression von Dateien, entwickelt von Julian Seward.
		Die Kompression mit bzip2 ist oft (aber nicht immer) effizienter, aber meist erheblich langsamer als die Kompression mit gzip.
		bzip2 ist der Nachfolger von bzip, das ursprünglich arithmetisches Kodieren nach dem Blocksort benutzte; aus patentrechtlichen Gründen wurde bzip jedoch nicht mehr weiterentwickelt.
	de.wikipedia.org /wiki/Bzip2 (148 words)

	SURFnet-CERT S-02-56:Multiple vulnerabilities in bzip2 (FreeBSD)
		In addition, the bzip2 utility did not securely create new files causing a race condition between creating the file and setting the correct permissions.
		Previous versions of FreeBSD did not contain bzip2 and are unaffected unless bzip2 was installed from the ports collection or manually by the system administrator.
		Due to the race condition between creating files and setting proper permissions, a local user may be able to read the contents of files regardless of their intended permissions.
	cert.surfnet.nl /s/2002/S-02-56.htm (739 words)

	Php - Using Bzip2 Archives Tutorials
		Another file format that does not come with all operating systems, but offers great compression rates, is Bzip2.
		To use this, you have to load the Bzip2 library from http://sources.redhat.com/bzip2/.
		The other direction (reading a file from a BZip2 archive) works analogously to reading a regular file.
	www.brainbell.com /tutorials/php/Using_Bzip2_Archives.htm (229 words)

	Linux: Kernel Compression With bzip2 (Site not responding. Last check: 2007-11-03)
		Christian Ludwig recently submitted a patch to the lkml to add bzip2 compression support into the kernel.
		The newer and highly portable bzip2 uses the Burrows-Wheeler block-sorting text compression algorithm and Huffman coding, and is thought to be patent-free by its author, Julian Seward.
		It is a port and cleanup of an earlier patch by Tom Oehser for the 2.2 kernel series.
	kerneltrap.org /node/325 (980 words)

	Bzip2 - LQWiki
		bzip2 uses a sophisticated algorithm to compress files that is up to 30 percent faster than that used by gzip.
		By default, bzip2 does not overwrite existing output files.
		bzip2 --keep test.dat - Compresses the specified file without overwriting the input file.
	wiki.linuxquestions.org /wiki/Bzip2 (107 words)

	256.bzip2: SPEC CPU2000 Benchmark Description
		The only difference between bzip2 0.1 and 256.bzip2 is that SPEC's version of bzip2 performs no file I/O other than reading the input.
		These components were selected as a reasonably representative set of things that bzip2 might most often be used on.
		Each input set is compressed and decompressed at two different blocking factors ("compression levels"), with the end result of the process being compared to the original data after each decompression step.
	www.spec.org /osg/cpu2000/CINT2000/256.bzip2/docs/256.bzip2.html (274 words)

	ISS X-Force Database: bzip2-toctou-symlink(19926): bzip2 TOCTOU symlink attack (Site not responding. Last check: 2007-11-03)
		bzip2 versions 1.0.2 and earlier could allow a local attacker to launch a symlink attack.
		If the local attacker has write access to the directory of a user using bzip2, the local attacker could exploit a TOCTOU vulnerability using a symlink to change file permissions of arbitrary files.
		CVE-2005-0953: Race condition in bzip2 1.0.2 and earlier allows local users to modify permissions of arbitrary files via a hard link attack on a file while it is being decompressed, whose permissions are changed by bzip2 after the decompression is complete.
	xforce.iss.net /xforce/xfdb/19926 (542 words)

	Parallel BZIP2 (PBZIP2)
		Always test (bzip2 -tv) a compressed file containing important data before deleting the original to verify the compression was successful.
		The pbzip2 program is a parallel version of bzip2 for use on shared memory machines.
		The output is fully compatible with the regular bzip2 data so any files created with pbzip2 can be uncompressed by bzip2 and vice-versa.
	compression.ca /pbzip2 (1080 words)

	RedHat: Low: bzip2 security update - The Community's Center for Security
		Updated bzip2 packages that fix multiple issues are now available.
		If an attacker has write access to the directory into which bzip2 is decompressing files, it is possible for them to modify permissions on files owned by the user running bzip2 (CAN-2005-0953).
		It is possible for an attacker to create a specially crafted bzip2 file which will cause bzip2 to cause a denial of service (by filling disk space) if decompressed by a victim (CAN-2005-1260).
	www.linuxsecurity.com /content/view/119329 (418 words)

	PHP: Bzip2 Compression Functions - Manual
		The bzip2 functions are used to transparently read and write bzip2 (.bz2) compressed files.
		Bzip2 support in PHP is not enabled by default.
		configuration option when compiling PHP to enable bzip2 support.
	us2.php.net /manual/en/ref.bzip2.php (155 words)

	Bzip2 - Andamooka Reader (Site not responding. Last check: 2007-11-03)
		The Bzip2 packages contains the bzip2, bunzip2, bzcat and bzip2recover programs.
		Bunzip2 decompresses files that are compressed with bzip2.
		Andamooka is built on SlashCode, MySQL, FreeBSD, and Apache.
	www.andamooka.org /reader.pl?pgid=lfsaa_bzip2 (128 words)

	FreshPorts -- archivers/bzip2
		This is bzip2, a advanced block-sorting file compressor.
		Remove superfluous IGNORE warning that bzip2 is already in the base system.
		Now that this is in the main src tree it could be cvs rm'ed for all I care.
	www.freshports.org /archivers/bzip2 (275 words)

	freshmeat.net: Project details for bzip2
		Add comment · Rate this project · Subscribe to new releases · Ignore this project · Email this project to a friend · Project record in XML
		Red Hat: Updated bzip2 packages fix multiple issues
		Debian: New bzip2 packages fix file unauthorised permissions modification
	freshmeat.net /projects/bzip2 (192 words)

	Mandriva: Updated bzip2 packages fix bzgrep vulnerabilities - The Community's Center for Security
		A bug was found in the way that bzgrep processed file names.
		If a user could be tricked into running bzgrep on a file with a special file name, it would be possible to execute arbitrary code with the privileges of the user running bzgrep.
		As well, the bzip2 package provided with Mandriva Linux 2006 did not the patch applied to correct CVE-2005-0953 which was previously fixed by MDKSA-2005:091; those packages are now properly patched.
	www.linuxsecurity.com /content/view/121448 (339 words)

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