diff options
author | cvs2svn <> | 2001-07-26 18:20:06 +0400 |
---|---|---|
committer | cvs2svn <> | 2001-07-26 18:20:06 +0400 |
commit | 53c570dbbc783190848fb72380c42664c4a5e808 (patch) | |
tree | 40a6c8d34d3251a96793ae39939b4a1aa5713079 /winsup/bz2lib/manual.texi | |
parent | c784c833aa9313a233a493cdb9e28f69fa7d360d (diff) |
This commit was manufactured by cvs2svn to create branchgdb_s390-2001-09-26-branchpointgdb_5_1-2001-07-29-branchpoint
'gdb_5_1-2001-07-29-branch'.
Sprout from master 2001-07-26 14:20:05 UTC DJ Delorie <dj@redhat.com> '* MAINTAINERS: Clarify libiberty merge rules and procedures.'
Cherrypick from cygnus 1999-05-03 07:29:06 UTC Richard Henderson <rth@redhat.com> '19990502 sourceware import':
COPYING
COPYING.LIB
README
config/mh-a68bsd
config/mh-aix386
config/mh-apollo68
config/mh-armpic
config/mh-cxux
config/mh-cygwin
config/mh-decstation
config/mh-delta88
config/mh-dgux
config/mh-dgux386
config/mh-djgpp
config/mh-elfalphapic
config/mh-hp300
config/mh-hpux
config/mh-hpux8
config/mh-interix
config/mh-irix4
config/mh-irix5
config/mh-lynxos
config/mh-lynxrs6k
config/mh-m68kpic
config/mh-mingw32
config/mh-ncr3000
config/mh-ncrsvr43
config/mh-necv4
config/mh-papic
config/mh-ppcpic
config/mh-riscos
config/mh-sco
config/mh-solaris
config/mh-sun3
config/mh-sysv
config/mh-sysv4
config/mh-sysv5
config/mh-vaxult2
config/mh-x86pic
config/mpw-mh-mpw
config/mpw/ChangeLog
config/mpw/MoveIfChange
config/mpw/README
config/mpw/forward-include
config/mpw/g-mpw-make.sed
config/mpw/mpw-touch
config/mpw/mpw-true
config/mpw/null-command
config/mpw/open-brace
config/mpw/tr-7to8-src
config/mpw/true
config/mt-armpic
config/mt-d30v
config/mt-elfalphapic
config/mt-linux
config/mt-m68kpic
config/mt-netware
config/mt-ospace
config/mt-papic
config/mt-ppcpic
config/mt-v810
config/mt-x86pic
etc/Makefile.in
etc/add-log.el
etc/add-log.vi
etc/configbuild.ein
etc/configbuild.fig
etc/configbuild.jin
etc/configbuild.tin
etc/configdev.ein
etc/configdev.fig
etc/configdev.jin
etc/configdev.tin
etc/configure
etc/configure.in
etc/configure.texi
etc/make-stds.texi
etc/standards.texi
include/aout/hp.h
include/aout/hppa.h
include/callback.h
include/coff/sym.h
include/coff/symconst.h
include/fopen-bin.h
include/fopen-same.h
include/fopen-vms.h
include/gdbm.h
include/mpw/ChangeLog
include/mpw/README
include/mpw/dir.h
include/mpw/dirent.h
include/mpw/fcntl.h
include/mpw/grp.h
include/mpw/mpw.h
include/mpw/pwd.h
include/mpw/stat.h
include/mpw/sys/file.h
include/mpw/sys/param.h
include/mpw/sys/resource.h
include/mpw/sys/stat.h
include/mpw/sys/time.h
include/mpw/sys/types.h
include/mpw/utime.h
include/mpw/varargs.h
include/nlm/ChangeLog
include/nlm/ppc-ext.h
include/objalloc.h
include/opcode/mn10200.h
include/opcode/tahoe.h
include/opcode/tic30.h
include/regs/ChangeLog
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makefile.vms
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mpw-README
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mpw-config.in
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libgloss/README
libgloss/close.c
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libgloss/config/mips.mt
libgloss/config/mn10200.mt
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libgloss/hp74x/checksum.c
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libgloss/hp74x/diagnose.h
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libgloss/mn10300/Makefile.in
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libgloss/mn10300/access.c
libgloss/mn10300/chmod.c
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libgloss/mn10300/test.c
libgloss/mn10300/time.c
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libgloss/mn10300/trap.S
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libgloss/open.c
libgloss/pa/Makefile.in
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libgloss/pa/configure.in
libgloss/pa/crt0.S
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winsup/testsuite/winsup.api/ltp/access01.c
winsup/testsuite/winsup.api/ltp/access03.c
winsup/testsuite/winsup.api/ltp/alarm01.c
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winsup/testsuite/winsup.api/ltp/asyncio02.c
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winsup/testsuite/winsup.api/ltp/chmod02.c
winsup/testsuite/winsup.api/ltp/chown01.c
winsup/testsuite/winsup.api/ltp/close08.c
winsup/testsuite/winsup.api/ltp/creat09.c
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winsup/testsuite/winsup.api/ltp/fchmod01.c
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winsup/testsuite/winsup.api/ltp/fsync01.c
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winsup/testsuite/winsup.api/ltp/geteuid01.c
winsup/testsuite/winsup.api/ltp/getgid01.c
winsup/testsuite/winsup.api/ltp/getgroups01.c
winsup/testsuite/winsup.api/ltp/getgroups02.c
winsup/testsuite/winsup.api/ltp/gethostid01.c
winsup/testsuite/winsup.api/ltp/gethostname01.c
winsup/testsuite/winsup.api/ltp/getpgrp01.c
winsup/testsuite/winsup.api/ltp/getpid01.c
winsup/testsuite/winsup.api/ltp/getppid01.c
winsup/testsuite/winsup.api/ltp/getuid01.c
winsup/testsuite/winsup.api/ltp/kill09.c
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winsup/testsuite/winsup.api/ltp/pathconf01.c
winsup/testsuite/winsup.api/ltp/pause01.c
winsup/testsuite/winsup.api/ltp/readlink02.c
winsup/testsuite/winsup.api/ltp/rename02.c
winsup/testsuite/winsup.api/ltp/rmdir04.c
winsup/testsuite/winsup.api/ltp/select01.c
winsup/testsuite/winsup.api/ltp/setgid01.c
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winsup/testsuite/winsup.api/ltp/setpgid01.c
winsup/testsuite/winsup.api/ltp/setregid01.c
winsup/testsuite/winsup.api/ltp/setreuid01.c
winsup/testsuite/winsup.api/ltp/setuid01.c
winsup/testsuite/winsup.api/ltp/setuid02.c
winsup/testsuite/winsup.api/ltp/stat05.c
winsup/testsuite/winsup.api/ltp/symlink01.c
winsup/testsuite/winsup.api/ltp/symlink02.c
winsup/testsuite/winsup.api/ltp/sync01.c
winsup/testsuite/winsup.api/ltp/time01.c
winsup/testsuite/winsup.api/ltp/times01.c
winsup/testsuite/winsup.api/ltp/ulimit01.c
winsup/testsuite/winsup.api/ltp/umask01.c
winsup/testsuite/winsup.api/ltp/uname01.c
winsup/testsuite/winsup.api/ltp/unlink05.c
winsup/testsuite/winsup.api/ltp/unlink06.c
winsup/testsuite/winsup.api/ltp/unlink07.c
winsup/testsuite/winsup.api/ltp/wait02.c
winsup/testsuite/winsup.api/ltp/write01.c
winsup/testsuite/winsup.api/mmaptest01.c
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winsup/testsuite/winsup.api/mmaptest03.c
winsup/testsuite/winsup.api/mmaptest04.c
winsup/testsuite/winsup.api/samples/sample-fail.c
winsup/testsuite/winsup.api/samples/sample-miscompile.c
winsup/testsuite/winsup.api/samples/sample-pass.c
winsup/testsuite/winsup.api/sigchld.c
winsup/testsuite/winsup.api/waitpid.c
winsup/testsuite/winsup.api/winsup.exp
winsup/utils/ChangeLog
winsup/utils/ChangeLog-2000
winsup/utils/Makefile.in
winsup/utils/aclocal.m4
winsup/utils/configure
winsup/utils/configure.in
winsup/utils/cygcheck.cc
winsup/utils/cygpath.cc
winsup/utils/dumper.cc
winsup/utils/dumper.h
winsup/utils/getfacl.c
winsup/utils/kill.cc
winsup/utils/mkgroup.c
winsup/utils/mkpasswd.c
winsup/utils/module_info.cc
winsup/utils/mount.cc
winsup/utils/parse_pe.cc
winsup/utils/passwd.c
winsup/utils/ps.cc
winsup/utils/regtool.cc
winsup/utils/setfacl.c
winsup/utils/ssp.c
winsup/utils/ssp.txt
winsup/utils/strace.cc
winsup/utils/umount.cc
winsup/utils/utils.sgml
winsup/w32api/CONTRIBUTIONS
winsup/w32api/ChangeLog
winsup/w32api/Makefile.in
winsup/w32api/README
winsup/w32api/TODO
winsup/w32api/config.guess
winsup/w32api/config.sub
winsup/w32api/configure
winsup/w32api/configure.in
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winsup/w32api/include/basetyps.h
winsup/w32api/include/cderr.h
winsup/w32api/include/cguid.h
winsup/w32api/include/commctrl.h
winsup/w32api/include/commdlg.h
winsup/w32api/include/cpl.h
winsup/w32api/include/cplext.h
winsup/w32api/include/custcntl.h
winsup/w32api/include/dbt.h
winsup/w32api/include/dde.h
winsup/w32api/include/ddeml.h
winsup/w32api/include/dlgs.h
winsup/w32api/include/excpt.h
winsup/w32api/include/httpext.h
winsup/w32api/include/imagehlp.h
winsup/w32api/include/imm.h
winsup/w32api/include/initguid.h
winsup/w32api/include/intshcut.h
winsup/w32api/include/ipexport.h
winsup/w32api/include/iphlpapi.h
winsup/w32api/include/ipifcons.h
winsup/w32api/include/iprtrmib.h
winsup/w32api/include/iptypes.h
winsup/w32api/include/isguids.h
winsup/w32api/include/largeint.h
winsup/w32api/include/lm.h
winsup/w32api/include/lmaccess.h
winsup/w32api/include/lmalert.h
winsup/w32api/include/lmapibuf.h
winsup/w32api/include/lmat.h
winsup/w32api/include/lmaudit.h
winsup/w32api/include/lmbrowsr.h
winsup/w32api/include/lmchdev.h
winsup/w32api/include/lmconfig.h
winsup/w32api/include/lmcons.h
winsup/w32api/include/lmerr.h
winsup/w32api/include/lmerrlog.h
winsup/w32api/include/lmmsg.h
winsup/w32api/include/lmremutl.h
winsup/w32api/include/lmrepl.h
winsup/w32api/include/lmserver.h
winsup/w32api/include/lmshare.h
winsup/w32api/include/lmsname.h
winsup/w32api/include/lmstats.h
winsup/w32api/include/lmsvc.h
winsup/w32api/include/lmuse.h
winsup/w32api/include/lmuseflg.h
winsup/w32api/include/lmwksta.h
winsup/w32api/include/lzexpand.h
winsup/w32api/include/mciavi.h
winsup/w32api/include/mcx.h
winsup/w32api/include/mmsystem.h
winsup/w32api/include/mswsock.h
winsup/w32api/include/nb30.h
winsup/w32api/include/nddeapi.h
winsup/w32api/include/nspapi.h
winsup/w32api/include/ntdef.h
winsup/w32api/include/ntsecapi.h
winsup/w32api/include/oaidl.h
winsup/w32api/include/objbase.h
winsup/w32api/include/objfwd.h
winsup/w32api/include/objidl.h
winsup/w32api/include/ocidl.h
winsup/w32api/include/odbcinst.h
winsup/w32api/include/ole.h
winsup/w32api/include/ole2.h
winsup/w32api/include/ole2ver.h
winsup/w32api/include/oleauto.h
winsup/w32api/include/olectl.h
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winsup/w32api/include/oledlg.h
winsup/w32api/include/oleidl.h
winsup/w32api/include/pbt.h
winsup/w32api/include/poppack.h
winsup/w32api/include/prsht.h
winsup/w32api/include/psapi.h
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winsup/w32api/include/rpcnterr.h
winsup/w32api/include/rpcproxy.h
winsup/w32api/include/scrnsave.h
winsup/w32api/include/shellapi.h
winsup/w32api/include/shlguid.h
winsup/w32api/include/shlobj.h
winsup/w32api/include/sql.h
winsup/w32api/include/sqlext.h
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winsup/w32api/include/sqlucode.h
winsup/w32api/include/subauth.h
winsup/w32api/include/tlhelp32.h
winsup/w32api/include/unknwn.h
winsup/w32api/include/userenv.h
winsup/w32api/include/w32api.h
winsup/w32api/include/winbase.h
winsup/w32api/include/wincon.h
winsup/w32api/include/wincrypt.h
winsup/w32api/include/windef.h
winsup/w32api/include/windows.h
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winsup/w32api/include/winerror.h
winsup/w32api/include/wingdi.h
winsup/w32api/include/wininet.h
winsup/w32api/include/winioctl.h
winsup/w32api/include/winnetwk.h
winsup/w32api/include/winnls.h
winsup/w32api/include/winnt.h
winsup/w32api/include/winperf.h
winsup/w32api/include/winreg.h
winsup/w32api/include/winresrc.h
winsup/w32api/include/winsock.h
winsup/w32api/include/winsock2.h
winsup/w32api/include/winspool.h
winsup/w32api/include/winsvc.h
winsup/w32api/include/winuser.h
winsup/w32api/include/winver.h
winsup/w32api/include/ws2tcpip.h
winsup/w32api/include/wtypes.h
winsup/w32api/include/zmouse.h
winsup/w32api/install-sh
winsup/w32api/lib/Makefile.in
winsup/w32api/lib/advapi32.def
winsup/w32api/lib/cap.def
winsup/w32api/lib/comctl32.def
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winsup/w32api/lib/dxguid.c
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winsup/w32api/lib/iphlpapi.def
winsup/w32api/lib/kernel32.def
winsup/w32api/lib/largeint.c
winsup/w32api/lib/lz32.def
winsup/w32api/lib/mapi32.def
winsup/w32api/lib/mfcuia32.def
winsup/w32api/lib/mgmtapi.def
winsup/w32api/lib/mpr.def
winsup/w32api/lib/msacm32.def
winsup/w32api/lib/msvcp60.def
winsup/w32api/lib/mswsock.def
winsup/w32api/lib/nddeapi.def
winsup/w32api/lib/netapi32.def
winsup/w32api/lib/odbc32.def
winsup/w32api/lib/odbccp32.def
winsup/w32api/lib/ole32.def
winsup/w32api/lib/oleaut32.def
winsup/w32api/lib/olecli32.def
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winsup/w32api/lib/olepro32.def
winsup/w32api/lib/olesvr32.def
winsup/w32api/lib/opengl32.def
winsup/w32api/lib/penwin32.def
winsup/w32api/lib/pkpd32.def
winsup/w32api/lib/psapi.def
winsup/w32api/lib/rapi.def
winsup/w32api/lib/rasapi32.def
winsup/w32api/lib/res.rc
winsup/w32api/lib/rpcdce4.def
winsup/w32api/lib/rpcns4.def
winsup/w32api/lib/rpcrt4.def
winsup/w32api/lib/scrnsave.c
winsup/w32api/lib/secur32.def
winsup/w32api/lib/shell32.c
winsup/w32api/lib/shell32.def
winsup/w32api/lib/svrapi.def
winsup/w32api/lib/tapi32.def
winsup/w32api/lib/test.c
winsup/w32api/lib/th32.def
winsup/w32api/lib/thunk32.def
winsup/w32api/lib/url.def
winsup/w32api/lib/user32.def
winsup/w32api/lib/userenv.def
winsup/w32api/lib/uuid.c
winsup/w32api/lib/vdmdbg.def
winsup/w32api/lib/version.def
winsup/w32api/lib/vfw32.def
winsup/w32api/lib/win32spl.def
winsup/w32api/lib/wininet.def
winsup/w32api/lib/winmm.def
winsup/w32api/lib/winspool.def
winsup/w32api/lib/winstrm.def
winsup/w32api/lib/wow32.def
winsup/w32api/lib/ws2_32.def
winsup/w32api/lib/wsock32.def
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Diffstat (limited to 'winsup/bz2lib/manual.texi')
-rw-r--r-- | winsup/bz2lib/manual.texi | 2215 |
1 files changed, 0 insertions, 2215 deletions
diff --git a/winsup/bz2lib/manual.texi b/winsup/bz2lib/manual.texi deleted file mode 100644 index 336776ab8..000000000 --- a/winsup/bz2lib/manual.texi +++ /dev/null @@ -1,2215 +0,0 @@ -\input texinfo @c -*- Texinfo -*- -@setfilename bzip2.info - -@ignore -This file documents bzip2 version 1.0, and associated library -libbzip2, written by Julian Seward (jseward@acm.org). - -Copyright (C) 1996-2000 Julian R Seward - -Permission is granted to make and distribute verbatim copies of -this manual provided the copyright notice and this permission notice -are preserved on all copies. - -Permission is granted to copy and distribute translations of this manual -into another language, under the above conditions for verbatim copies. -@end ignore - -@ifinfo -@format -START-INFO-DIR-ENTRY -* Bzip2: (bzip2). A program and library for data compression. -END-INFO-DIR-ENTRY -@end format - -@end ifinfo - -@iftex -@c @finalout -@settitle bzip2 and libbzip2 -@titlepage -@title bzip2 and libbzip2 -@subtitle a program and library for data compression -@subtitle copyright (C) 1996-2000 Julian Seward -@subtitle version 1.0 of 21 March 2000 -@author Julian Seward - -@end titlepage - -@parindent 0mm -@parskip 2mm - -@end iftex -@node Top, Overview, (dir), (dir) - -This program, @code{bzip2}, -and associated library @code{libbzip2}, are -Copyright (C) 1996-2000 Julian R Seward. All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions -are met: -@itemize @bullet -@item - Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. -@item - The origin of this software must not be misrepresented; you must - not claim that you wrote the original software. If you use this - software in a product, an acknowledgment in the product - documentation would be appreciated but is not required. -@item - Altered source versions must be plainly marked as such, and must - not be misrepresented as being the original software. -@item - The name of the author may not be used to endorse or promote - products derived from this software without specific prior written - permission. -@end itemize -THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS -OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE -GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, -WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -Julian Seward, Cambridge, UK. - -@code{jseward@@acm.org} - -@code{http://sourceware.cygnus.com/bzip2} - -@code{http://www.cacheprof.org} - -@code{http://www.muraroa.demon.co.uk} - -@code{bzip2}/@code{libbzip2} version 1.0 of 21 March 2000. - -PATENTS: To the best of my knowledge, @code{bzip2} does not use any patented -algorithms. However, I do not have the resources available to carry out -a full patent search. Therefore I cannot give any guarantee of the -above statement. - - - - - - - -@node Overview, Implementation, Top, Top -@chapter Introduction - -@code{bzip2} compresses files using the Burrows-Wheeler -block-sorting text compression algorithm, and Huffman coding. -Compression is generally considerably better than that -achieved by more conventional LZ77/LZ78-based compressors, -and approaches the performance of the PPM family of statistical compressors. - -@code{bzip2} is built on top of @code{libbzip2}, a flexible library -for handling compressed data in the @code{bzip2} format. This manual -describes both how to use the program and -how to work with the library interface. Most of the -manual is devoted to this library, not the program, -which is good news if your interest is only in the program. - -Chapter 2 describes how to use @code{bzip2}; this is the only part -you need to read if you just want to know how to operate the program. -Chapter 3 describes the programming interfaces in detail, and -Chapter 4 records some miscellaneous notes which I thought -ought to be recorded somewhere. - - -@chapter How to use @code{bzip2} - -This chapter contains a copy of the @code{bzip2} man page, -and nothing else. - -@quotation - -@unnumberedsubsubsec NAME -@itemize -@item @code{bzip2}, @code{bunzip2} -- a block-sorting file compressor, v1.0 -@item @code{bzcat} -- decompresses files to stdout -@item @code{bzip2recover} -- recovers data from damaged bzip2 files -@end itemize - -@unnumberedsubsubsec SYNOPSIS -@itemize -@item @code{bzip2} [ -cdfkqstvzVL123456789 ] [ filenames ... ] -@item @code{bunzip2} [ -fkvsVL ] [ filenames ... ] -@item @code{bzcat} [ -s ] [ filenames ... ] -@item @code{bzip2recover} filename -@end itemize - -@unnumberedsubsubsec DESCRIPTION - -@code{bzip2} compresses files using the Burrows-Wheeler block sorting -text compression algorithm, and Huffman coding. Compression is -generally considerably better than that achieved by more conventional -LZ77/LZ78-based compressors, and approaches the performance of the PPM -family of statistical compressors. - -The command-line options are deliberately very similar to those of GNU -@code{gzip}, but they are not identical. - -@code{bzip2} expects a list of file names to accompany the command-line -flags. Each file is replaced by a compressed version of itself, with -the name @code{original_name.bz2}. Each compressed file has the same -modification date, permissions, and, when possible, ownership as the -corresponding original, so that these properties can be correctly -restored at decompression time. File name handling is naive in the -sense that there is no mechanism for preserving original file names, -permissions, ownerships or dates in filesystems which lack these -concepts, or have serious file name length restrictions, such as MS-DOS. - -@code{bzip2} and @code{bunzip2} will by default not overwrite existing -files. If you want this to happen, specify the @code{-f} flag. - -If no file names are specified, @code{bzip2} compresses from standard -input to standard output. In this case, @code{bzip2} will decline to -write compressed output to a terminal, as this would be entirely -incomprehensible and therefore pointless. - -@code{bunzip2} (or @code{bzip2 -d}) decompresses all -specified files. Files which were not created by @code{bzip2} -will be detected and ignored, and a warning issued. -@code{bzip2} attempts to guess the filename for the decompressed file -from that of the compressed file as follows: -@itemize -@item @code{filename.bz2 } becomes @code{filename} -@item @code{filename.bz } becomes @code{filename} -@item @code{filename.tbz2} becomes @code{filename.tar} -@item @code{filename.tbz } becomes @code{filename.tar} -@item @code{anyothername } becomes @code{anyothername.out} -@end itemize -If the file does not end in one of the recognised endings, -@code{.bz2}, @code{.bz}, -@code{.tbz2} or @code{.tbz}, @code{bzip2} complains that it cannot -guess the name of the original file, and uses the original name -with @code{.out} appended. - -As with compression, supplying no -filenames causes decompression from standard input to standard output. - -@code{bunzip2} will correctly decompress a file which is the -concatenation of two or more compressed files. The result is the -concatenation of the corresponding uncompressed files. Integrity -testing (@code{-t}) of concatenated compressed files is also supported. - -You can also compress or decompress files to the standard output by -giving the @code{-c} flag. Multiple files may be compressed and -decompressed like this. The resulting outputs are fed sequentially to -stdout. Compression of multiple files in this manner generates a stream -containing multiple compressed file representations. Such a stream -can be decompressed correctly only by @code{bzip2} version 0.9.0 or -later. Earlier versions of @code{bzip2} will stop after decompressing -the first file in the stream. - -@code{bzcat} (or @code{bzip2 -dc}) decompresses all specified files to -the standard output. - -@code{bzip2} will read arguments from the environment variables -@code{BZIP2} and @code{BZIP}, in that order, and will process them -before any arguments read from the command line. This gives a -convenient way to supply default arguments. - -Compression is always performed, even if the compressed file is slightly -larger than the original. Files of less than about one hundred bytes -tend to get larger, since the compression mechanism has a constant -overhead in the region of 50 bytes. Random data (including the output -of most file compressors) is coded at about 8.05 bits per byte, giving -an expansion of around 0.5%. - -As a self-check for your protection, @code{bzip2} uses 32-bit CRCs to -make sure that the decompressed version of a file is identical to the -original. This guards against corruption of the compressed data, and -against undetected bugs in @code{bzip2} (hopefully very unlikely). The -chances of data corruption going undetected is microscopic, about one -chance in four billion for each file processed. Be aware, though, that -the check occurs upon decompression, so it can only tell you that -something is wrong. It can't help you recover the original uncompressed -data. You can use @code{bzip2recover} to try to recover data from -damaged files. - -Return values: 0 for a normal exit, 1 for environmental problems (file -not found, invalid flags, I/O errors, &c), 2 to indicate a corrupt -compressed file, 3 for an internal consistency error (eg, bug) which -caused @code{bzip2} to panic. - - -@unnumberedsubsubsec OPTIONS -@table @code -@item -c --stdout -Compress or decompress to standard output. -@item -d --decompress -Force decompression. @code{bzip2}, @code{bunzip2} and @code{bzcat} are -really the same program, and the decision about what actions to take is -done on the basis of which name is used. This flag overrides that -mechanism, and forces bzip2 to decompress. -@item -z --compress -The complement to @code{-d}: forces compression, regardless of the -invokation name. -@item -t --test -Check integrity of the specified file(s), but don't decompress them. -This really performs a trial decompression and throws away the result. -@item -f --force -Force overwrite of output files. Normally, @code{bzip2} will not overwrite -existing output files. Also forces @code{bzip2} to break hard links -to files, which it otherwise wouldn't do. -@item -k --keep -Keep (don't delete) input files during compression -or decompression. -@item -s --small -Reduce memory usage, for compression, decompression and testing. Files -are decompressed and tested using a modified algorithm which only -requires 2.5 bytes per block byte. This means any file can be -decompressed in 2300k of memory, albeit at about half the normal speed. - -During compression, @code{-s} selects a block size of 200k, which limits -memory use to around the same figure, at the expense of your compression -ratio. In short, if your machine is low on memory (8 megabytes or -less), use -s for everything. See MEMORY MANAGEMENT below. -@item -q --quiet -Suppress non-essential warning messages. Messages pertaining to -I/O errors and other critical events will not be suppressed. -@item -v --verbose -Verbose mode -- show the compression ratio for each file processed. -Further @code{-v}'s increase the verbosity level, spewing out lots of -information which is primarily of interest for diagnostic purposes. -@item -L --license -V --version -Display the software version, license terms and conditions. -@item -1 to -9 -Set the block size to 100 k, 200 k .. 900 k when compressing. Has no -effect when decompressing. See MEMORY MANAGEMENT below. -@item -- -Treats all subsequent arguments as file names, even if they start -with a dash. This is so you can handle files with names beginning -with a dash, for example: @code{bzip2 -- -myfilename}. -@item --repetitive-fast -@item --repetitive-best -These flags are redundant in versions 0.9.5 and above. They provided -some coarse control over the behaviour of the sorting algorithm in -earlier versions, which was sometimes useful. 0.9.5 and above have an -improved algorithm which renders these flags irrelevant. -@end table - - -@unnumberedsubsubsec MEMORY MANAGEMENT - -@code{bzip2} compresses large files in blocks. The block size affects -both the compression ratio achieved, and the amount of memory needed for -compression and decompression. The flags @code{-1} through @code{-9} -specify the block size to be 100,000 bytes through 900,000 bytes (the -default) respectively. At decompression time, the block size used for -compression is read from the header of the compressed file, and -@code{bunzip2} then allocates itself just enough memory to decompress -the file. Since block sizes are stored in compressed files, it follows -that the flags @code{-1} to @code{-9} are irrelevant to and so ignored -during decompression. - -Compression and decompression requirements, in bytes, can be estimated -as: -@example - Compression: 400k + ( 8 x block size ) - - Decompression: 100k + ( 4 x block size ), or - 100k + ( 2.5 x block size ) -@end example -Larger block sizes give rapidly diminishing marginal returns. Most of -the compression comes from the first two or three hundred k of block -size, a fact worth bearing in mind when using @code{bzip2} on small machines. -It is also important to appreciate that the decompression memory -requirement is set at compression time by the choice of block size. - -For files compressed with the default 900k block size, @code{bunzip2} -will require about 3700 kbytes to decompress. To support decompression -of any file on a 4 megabyte machine, @code{bunzip2} has an option to -decompress using approximately half this amount of memory, about 2300 -kbytes. Decompression speed is also halved, so you should use this -option only where necessary. The relevant flag is @code{-s}. - -In general, try and use the largest block size memory constraints allow, -since that maximises the compression achieved. Compression and -decompression speed are virtually unaffected by block size. - -Another significant point applies to files which fit in a single block --- that means most files you'd encounter using a large block size. The -amount of real memory touched is proportional to the size of the file, -since the file is smaller than a block. For example, compressing a file -20,000 bytes long with the flag @code{-9} will cause the compressor to -allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560 -kbytes of it. Similarly, the decompressor will allocate 3700k but only -touch 100k + 20000 * 4 = 180 kbytes. - -Here is a table which summarises the maximum memory usage for different -block sizes. Also recorded is the total compressed size for 14 files of -the Calgary Text Compression Corpus totalling 3,141,622 bytes. This -column gives some feel for how compression varies with block size. -These figures tend to understate the advantage of larger block sizes for -larger files, since the Corpus is dominated by smaller files. -@example - Compress Decompress Decompress Corpus - Flag usage usage -s usage Size - - -1 1200k 500k 350k 914704 - -2 2000k 900k 600k 877703 - -3 2800k 1300k 850k 860338 - -4 3600k 1700k 1100k 846899 - -5 4400k 2100k 1350k 845160 - -6 5200k 2500k 1600k 838626 - -7 6100k 2900k 1850k 834096 - -8 6800k 3300k 2100k 828642 - -9 7600k 3700k 2350k 828642 -@end example - -@unnumberedsubsubsec RECOVERING DATA FROM DAMAGED FILES - -@code{bzip2} compresses files in blocks, usually 900kbytes long. Each -block is handled independently. If a media or transmission error causes -a multi-block @code{.bz2} file to become damaged, it may be possible to -recover data from the undamaged blocks in the file. - -The compressed representation of each block is delimited by a 48-bit -pattern, which makes it possible to find the block boundaries with -reasonable certainty. Each block also carries its own 32-bit CRC, so -damaged blocks can be distinguished from undamaged ones. - -@code{bzip2recover} is a simple program whose purpose is to search for -blocks in @code{.bz2} files, and write each block out into its own -@code{.bz2} file. You can then use @code{bzip2 -t} to test the -integrity of the resulting files, and decompress those which are -undamaged. - -@code{bzip2recover} -takes a single argument, the name of the damaged file, -and writes a number of files @code{rec0001file.bz2}, - @code{rec0002file.bz2}, etc, containing the extracted blocks. - The output filenames are designed so that the use of - wildcards in subsequent processing -- for example, -@code{bzip2 -dc rec*file.bz2 > recovered_data} -- lists the files in - the correct order. - -@code{bzip2recover} should be of most use dealing with large @code{.bz2} - files, as these will contain many blocks. It is clearly - futile to use it on damaged single-block files, since a - damaged block cannot be recovered. If you wish to minimise -any potential data loss through media or transmission errors, -you might consider compressing with a smaller - block size. - - -@unnumberedsubsubsec PERFORMANCE NOTES - -The sorting phase of compression gathers together similar strings in the -file. Because of this, files containing very long runs of repeated -symbols, like "aabaabaabaab ..." (repeated several hundred times) may -compress more slowly than normal. Versions 0.9.5 and above fare much -better than previous versions in this respect. The ratio between -worst-case and average-case compression time is in the region of 10:1. -For previous versions, this figure was more like 100:1. You can use the -@code{-vvvv} option to monitor progress in great detail, if you want. - -Decompression speed is unaffected by these phenomena. - -@code{bzip2} usually allocates several megabytes of memory to operate -in, and then charges all over it in a fairly random fashion. This means -that performance, both for compressing and decompressing, is largely -determined by the speed at which your machine can service cache misses. -Because of this, small changes to the code to reduce the miss rate have -been observed to give disproportionately large performance improvements. -I imagine @code{bzip2} will perform best on machines with very large -caches. - - -@unnumberedsubsubsec CAVEATS - -I/O error messages are not as helpful as they could be. @code{bzip2} -tries hard to detect I/O errors and exit cleanly, but the details of -what the problem is sometimes seem rather misleading. - -This manual page pertains to version 1.0 of @code{bzip2}. Compressed -data created by this version is entirely forwards and backwards -compatible with the previous public releases, versions 0.1pl2, 0.9.0 and -0.9.5, but with the following exception: 0.9.0 and above can correctly -decompress multiple concatenated compressed files. 0.1pl2 cannot do -this; it will stop after decompressing just the first file in the -stream. - -@code{bzip2recover} uses 32-bit integers to represent bit positions in -compressed files, so it cannot handle compressed files more than 512 -megabytes long. This could easily be fixed. - - -@unnumberedsubsubsec AUTHOR -Julian Seward, @code{jseward@@acm.org}. - -The ideas embodied in @code{bzip2} are due to (at least) the following -people: Michael Burrows and David Wheeler (for the block sorting -transformation), David Wheeler (again, for the Huffman coder), Peter -Fenwick (for the structured coding model in the original @code{bzip}, -and many refinements), and Alistair Moffat, Radford Neal and Ian Witten -(for the arithmetic coder in the original @code{bzip}). I am much -indebted for their help, support and advice. See the manual in the -source distribution for pointers to sources of documentation. Christian -von Roques encouraged me to look for faster sorting algorithms, so as to -speed up compression. Bela Lubkin encouraged me to improve the -worst-case compression performance. Many people sent patches, helped -with portability problems, lent machines, gave advice and were generally -helpful. - -@end quotation - - - - -@chapter Programming with @code{libbzip2} - -This chapter describes the programming interface to @code{libbzip2}. - -For general background information, particularly about memory -use and performance aspects, you'd be well advised to read Chapter 2 -as well. - -@section Top-level structure - -@code{libbzip2} is a flexible library for compressing and decompressing -data in the @code{bzip2} data format. Although packaged as a single -entity, it helps to regard the library as three separate parts: the low -level interface, and the high level interface, and some utility -functions. - -The structure of @code{libbzip2}'s interfaces is similar to -that of Jean-loup Gailly's and Mark Adler's excellent @code{zlib} -library. - -All externally visible symbols have names beginning @code{BZ2_}. -This is new in version 1.0. The intention is to minimise pollution -of the namespaces of library clients. - -@subsection Low-level summary - -This interface provides services for compressing and decompressing -data in memory. There's no provision for dealing with files, streams -or any other I/O mechanisms, just straight memory-to-memory work. -In fact, this part of the library can be compiled without inclusion -of @code{stdio.h}, which may be helpful for embedded applications. - -The low-level part of the library has no global variables and -is therefore thread-safe. - -Six routines make up the low level interface: -@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, and @* @code{BZ2_bzCompressEnd} -for compression, -and a corresponding trio @code{BZ2_bzDecompressInit}, @* @code{BZ2_bzDecompress} -and @code{BZ2_bzDecompressEnd} for decompression. -The @code{*Init} functions allocate -memory for compression/decompression and do other -initialisations, whilst the @code{*End} functions close down operations -and release memory. - -The real work is done by @code{BZ2_bzCompress} and @code{BZ2_bzDecompress}. -These compress and decompress data from a user-supplied input buffer -to a user-supplied output buffer. These buffers can be any size; -arbitrary quantities of data are handled by making repeated calls -to these functions. This is a flexible mechanism allowing a -consumer-pull style of activity, or producer-push, or a mixture of -both. - - - -@subsection High-level summary - -This interface provides some handy wrappers around the low-level -interface to facilitate reading and writing @code{bzip2} format -files (@code{.bz2} files). The routines provide hooks to facilitate -reading files in which the @code{bzip2} data stream is embedded -within some larger-scale file structure, or where there are -multiple @code{bzip2} data streams concatenated end-to-end. - -For reading files, @code{BZ2_bzReadOpen}, @code{BZ2_bzRead}, -@code{BZ2_bzReadClose} and @* @code{BZ2_bzReadGetUnused} are supplied. For -writing files, @code{BZ2_bzWriteOpen}, @code{BZ2_bzWrite} and -@code{BZ2_bzWriteFinish} are available. - -As with the low-level library, no global variables are used -so the library is per se thread-safe. However, if I/O errors -occur whilst reading or writing the underlying compressed files, -you may have to consult @code{errno} to determine the cause of -the error. In that case, you'd need a C library which correctly -supports @code{errno} in a multithreaded environment. - -To make the library a little simpler and more portable, -@code{BZ2_bzReadOpen} and @code{BZ2_bzWriteOpen} require you to pass them file -handles (@code{FILE*}s) which have previously been opened for reading or -writing respectively. That avoids portability problems associated with -file operations and file attributes, whilst not being much of an -imposition on the programmer. - - - -@subsection Utility functions summary -For very simple needs, @code{BZ2_bzBuffToBuffCompress} and -@code{BZ2_bzBuffToBuffDecompress} are provided. These compress -data in memory from one buffer to another buffer in a single -function call. You should assess whether these functions -fulfill your memory-to-memory compression/decompression -requirements before investing effort in understanding the more -general but more complex low-level interface. - -Yoshioka Tsuneo (@code{QWF00133@@niftyserve.or.jp} / -@code{tsuneo-y@@is.aist-nara.ac.jp}) has contributed some functions to -give better @code{zlib} compatibility. These functions are -@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush}, -@code{BZ2_bzclose}, -@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}. You may find these functions -more convenient for simple file reading and writing, than those in the -high-level interface. These functions are not (yet) officially part of -the library, and are minimally documented here. If they break, you -get to keep all the pieces. I hope to document them properly when time -permits. - -Yoshioka also contributed modifications to allow the library to be -built as a Windows DLL. - - -@section Error handling - -The library is designed to recover cleanly in all situations, including -the worst-case situation of decompressing random data. I'm not -100% sure that it can always do this, so you might want to add -a signal handler to catch segmentation violations during decompression -if you are feeling especially paranoid. I would be interested in -hearing more about the robustness of the library to corrupted -compressed data. - -Version 1.0 is much more robust in this respect than -0.9.0 or 0.9.5. Investigations with Checker (a tool for -detecting problems with memory management, similar to Purify) -indicate that, at least for the few files I tested, all single-bit -errors in the decompressed data are caught properly, with no -segmentation faults, no reads of uninitialised data and no -out of range reads or writes. So it's certainly much improved, -although I wouldn't claim it to be totally bombproof. - -The file @code{bzlib.h} contains all definitions needed to use -the library. In particular, you should definitely not include -@code{bzlib_private.h}. - -In @code{bzlib.h}, the various return values are defined. The following -list is not intended as an exhaustive description of the circumstances -in which a given value may be returned -- those descriptions are given -later. Rather, it is intended to convey the rough meaning of each -return value. The first five actions are normal and not intended to -denote an error situation. -@table @code -@item BZ_OK -The requested action was completed successfully. -@item BZ_RUN_OK -@itemx BZ_FLUSH_OK -@itemx BZ_FINISH_OK -In @code{BZ2_bzCompress}, the requested flush/finish/nothing-special action -was completed successfully. -@item BZ_STREAM_END -Compression of data was completed, or the logical stream end was -detected during decompression. -@end table - -The following return values indicate an error of some kind. -@table @code -@item BZ_CONFIG_ERROR -Indicates that the library has been improperly compiled on your -platform -- a major configuration error. Specifically, it means -that @code{sizeof(char)}, @code{sizeof(short)} and @code{sizeof(int)} -are not 1, 2 and 4 respectively, as they should be. Note that the -library should still work properly on 64-bit platforms which follow -the LP64 programming model -- that is, where @code{sizeof(long)} -and @code{sizeof(void*)} are 8. Under LP64, @code{sizeof(int)} is -still 4, so @code{libbzip2}, which doesn't use the @code{long} type, -is OK. -@item BZ_SEQUENCE_ERROR -When using the library, it is important to call the functions in the -correct sequence and with data structures (buffers etc) in the correct -states. @code{libbzip2} checks as much as it can to ensure this is -happening, and returns @code{BZ_SEQUENCE_ERROR} if not. Code which -complies precisely with the function semantics, as detailed below, -should never receive this value; such an event denotes buggy code -which you should investigate. -@item BZ_PARAM_ERROR -Returned when a parameter to a function call is out of range -or otherwise manifestly incorrect. As with @code{BZ_SEQUENCE_ERROR}, -this denotes a bug in the client code. The distinction between -@code{BZ_PARAM_ERROR} and @code{BZ_SEQUENCE_ERROR} is a bit hazy, but still worth -making. -@item BZ_MEM_ERROR -Returned when a request to allocate memory failed. Note that the -quantity of memory needed to decompress a stream cannot be determined -until the stream's header has been read. So @code{BZ2_bzDecompress} and -@code{BZ2_bzRead} may return @code{BZ_MEM_ERROR} even though some of -the compressed data has been read. The same is not true for -compression; once @code{BZ2_bzCompressInit} or @code{BZ2_bzWriteOpen} have -successfully completed, @code{BZ_MEM_ERROR} cannot occur. -@item BZ_DATA_ERROR -Returned when a data integrity error is detected during decompression. -Most importantly, this means when stored and computed CRCs for the -data do not match. This value is also returned upon detection of any -other anomaly in the compressed data. -@item BZ_DATA_ERROR_MAGIC -As a special case of @code{BZ_DATA_ERROR}, it is sometimes useful to -know when the compressed stream does not start with the correct -magic bytes (@code{'B' 'Z' 'h'}). -@item BZ_IO_ERROR -Returned by @code{BZ2_bzRead} and @code{BZ2_bzWrite} when there is an error -reading or writing in the compressed file, and by @code{BZ2_bzReadOpen} -and @code{BZ2_bzWriteOpen} for attempts to use a file for which the -error indicator (viz, @code{ferror(f)}) is set. -On receipt of @code{BZ_IO_ERROR}, the caller should consult -@code{errno} and/or @code{perror} to acquire operating-system -specific information about the problem. -@item BZ_UNEXPECTED_EOF -Returned by @code{BZ2_bzRead} when the compressed file finishes -before the logical end of stream is detected. -@item BZ_OUTBUFF_FULL -Returned by @code{BZ2_bzBuffToBuffCompress} and -@code{BZ2_bzBuffToBuffDecompress} to indicate that the output data -will not fit into the output buffer provided. -@end table - - - -@section Low-level interface - -@subsection @code{BZ2_bzCompressInit} -@example -typedef - struct @{ - char *next_in; - unsigned int avail_in; - unsigned int total_in_lo32; - unsigned int total_in_hi32; - - char *next_out; - unsigned int avail_out; - unsigned int total_out_lo32; - unsigned int total_out_hi32; - - void *state; - - void *(*bzalloc)(void *,int,int); - void (*bzfree)(void *,void *); - void *opaque; - @} - bz_stream; - -int BZ2_bzCompressInit ( bz_stream *strm, - int blockSize100k, - int verbosity, - int workFactor ); - -@end example - -Prepares for compression. The @code{bz_stream} structure -holds all data pertaining to the compression activity. -A @code{bz_stream} structure should be allocated and initialised -prior to the call. -The fields of @code{bz_stream} -comprise the entirety of the user-visible data. @code{state} -is a pointer to the private data structures required for compression. - -Custom memory allocators are supported, via fields @code{bzalloc}, -@code{bzfree}, -and @code{opaque}. The value -@code{opaque} is passed to as the first argument to -all calls to @code{bzalloc} and @code{bzfree}, but is -otherwise ignored by the library. -The call @code{bzalloc ( opaque, n, m )} is expected to return a -pointer @code{p} to -@code{n * m} bytes of memory, and @code{bzfree ( opaque, p )} -should free -that memory. - -If you don't want to use a custom memory allocator, set @code{bzalloc}, -@code{bzfree} and -@code{opaque} to @code{NULL}, -and the library will then use the standard @code{malloc}/@code{free} -routines. - -Before calling @code{BZ2_bzCompressInit}, fields @code{bzalloc}, -@code{bzfree} and @code{opaque} should -be filled appropriately, as just described. Upon return, the internal -state will have been allocated and initialised, and @code{total_in_lo32}, -@code{total_in_hi32}, @code{total_out_lo32} and -@code{total_out_hi32} will have been set to zero. -These four fields are used by the library -to inform the caller of the total amount of data passed into and out of -the library, respectively. You should not try to change them. -As of version 1.0, 64-bit counts are maintained, even on 32-bit -platforms, using the @code{_hi32} fields to store the upper 32 bits -of the count. So, for example, the total amount of data in -is @code{(total_in_hi32 << 32) + total_in_lo32}. - -Parameter @code{blockSize100k} specifies the block size to be used for -compression. It should be a value between 1 and 9 inclusive, and the -actual block size used is 100000 x this figure. 9 gives the best -compression but takes most memory. - -Parameter @code{verbosity} should be set to a number between 0 and 4 -inclusive. 0 is silent, and greater numbers give increasingly verbose -monitoring/debugging output. If the library has been compiled with -@code{-DBZ_NO_STDIO}, no such output will appear for any verbosity -setting. - -Parameter @code{workFactor} controls how the compression phase behaves -when presented with worst case, highly repetitive, input data. If -compression runs into difficulties caused by repetitive data, the -library switches from the standard sorting algorithm to a fallback -algorithm. The fallback is slower than the standard algorithm by -perhaps a factor of three, but always behaves reasonably, no matter how -bad the input. - -Lower values of @code{workFactor} reduce the amount of effort the -standard algorithm will expend before resorting to the fallback. You -should set this parameter carefully; too low, and many inputs will be -handled by the fallback algorithm and so compress rather slowly, too -high, and your average-to-worst case compression times can become very -large. The default value of 30 gives reasonable behaviour over a wide -range of circumstances. - -Allowable values range from 0 to 250 inclusive. 0 is a special case, -equivalent to using the default value of 30. - -Note that the compressed output generated is the same regardless of -whether or not the fallback algorithm is used. - -Be aware also that this parameter may disappear entirely in future -versions of the library. In principle it should be possible to devise a -good way to automatically choose which algorithm to use. Such a -mechanism would render the parameter obsolete. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL} - or @code{blockSize} < 1 or @code{blockSize} > 9 - or @code{verbosity} < 0 or @code{verbosity} > 4 - or @code{workFactor} < 0 or @code{workFactor} > 250 - @code{BZ_MEM_ERROR} - if not enough memory is available - @code{BZ_OK} - otherwise -@end display -Allowable next actions: -@display - @code{BZ2_bzCompress} - if @code{BZ_OK} is returned - no specific action needed in case of error -@end display - -@subsection @code{BZ2_bzCompress} -@example - int BZ2_bzCompress ( bz_stream *strm, int action ); -@end example -Provides more input and/or output buffer space for the library. The -caller maintains input and output buffers, and calls @code{BZ2_bzCompress} to -transfer data between them. - -Before each call to @code{BZ2_bzCompress}, @code{next_in} should point at -the data to be compressed, and @code{avail_in} should indicate how many -bytes the library may read. @code{BZ2_bzCompress} updates @code{next_in}, -@code{avail_in} and @code{total_in} to reflect the number of bytes it -has read. - -Similarly, @code{next_out} should point to a buffer in which the -compressed data is to be placed, with @code{avail_out} indicating how -much output space is available. @code{BZ2_bzCompress} updates -@code{next_out}, @code{avail_out} and @code{total_out} to reflect the -number of bytes output. - -You may provide and remove as little or as much data as you like on each -call of @code{BZ2_bzCompress}. In the limit, it is acceptable to supply and -remove data one byte at a time, although this would be terribly -inefficient. You should always ensure that at least one byte of output -space is available at each call. - -A second purpose of @code{BZ2_bzCompress} is to request a change of mode of the -compressed stream. - -Conceptually, a compressed stream can be in one of four states: IDLE, -RUNNING, FLUSHING and FINISHING. Before initialisation -(@code{BZ2_bzCompressInit}) and after termination (@code{BZ2_bzCompressEnd}), a -stream is regarded as IDLE. - -Upon initialisation (@code{BZ2_bzCompressInit}), the stream is placed in the -RUNNING state. Subsequent calls to @code{BZ2_bzCompress} should pass -@code{BZ_RUN} as the requested action; other actions are illegal and -will result in @code{BZ_SEQUENCE_ERROR}. - -At some point, the calling program will have provided all the input data -it wants to. It will then want to finish up -- in effect, asking the -library to process any data it might have buffered internally. In this -state, @code{BZ2_bzCompress} will no longer attempt to read data from -@code{next_in}, but it will want to write data to @code{next_out}. -Because the output buffer supplied by the user can be arbitrarily small, -the finishing-up operation cannot necessarily be done with a single call -of @code{BZ2_bzCompress}. - -Instead, the calling program passes @code{BZ_FINISH} as an action to -@code{BZ2_bzCompress}. This changes the stream's state to FINISHING. Any -remaining input (ie, @code{next_in[0 .. avail_in-1]}) is compressed and -transferred to the output buffer. To do this, @code{BZ2_bzCompress} must be -called repeatedly until all the output has been consumed. At that -point, @code{BZ2_bzCompress} returns @code{BZ_STREAM_END}, and the stream's -state is set back to IDLE. @code{BZ2_bzCompressEnd} should then be -called. - -Just to make sure the calling program does not cheat, the library makes -a note of @code{avail_in} at the time of the first call to -@code{BZ2_bzCompress} which has @code{BZ_FINISH} as an action (ie, at the -time the program has announced its intention to not supply any more -input). By comparing this value with that of @code{avail_in} over -subsequent calls to @code{BZ2_bzCompress}, the library can detect any -attempts to slip in more data to compress. Any calls for which this is -detected will return @code{BZ_SEQUENCE_ERROR}. This indicates a -programming mistake which should be corrected. - -Instead of asking to finish, the calling program may ask -@code{BZ2_bzCompress} to take all the remaining input, compress it and -terminate the current (Burrows-Wheeler) compression block. This could -be useful for error control purposes. The mechanism is analogous to -that for finishing: call @code{BZ2_bzCompress} with an action of -@code{BZ_FLUSH}, remove output data, and persist with the -@code{BZ_FLUSH} action until the value @code{BZ_RUN} is returned. As -with finishing, @code{BZ2_bzCompress} detects any attempt to provide more -input data once the flush has begun. - -Once the flush is complete, the stream returns to the normal RUNNING -state. - -This all sounds pretty complex, but isn't really. Here's a table -which shows which actions are allowable in each state, what action -will be taken, what the next state is, and what the non-error return -values are. Note that you can't explicitly ask what state the -stream is in, but nor do you need to -- it can be inferred from the -values returned by @code{BZ2_bzCompress}. -@display -IDLE/@code{any} - Illegal. IDLE state only exists after @code{BZ2_bzCompressEnd} or - before @code{BZ2_bzCompressInit}. - Return value = @code{BZ_SEQUENCE_ERROR} - -RUNNING/@code{BZ_RUN} - Compress from @code{next_in} to @code{next_out} as much as possible. - Next state = RUNNING - Return value = @code{BZ_RUN_OK} - -RUNNING/@code{BZ_FLUSH} - Remember current value of @code{next_in}. Compress from @code{next_in} - to @code{next_out} as much as possible, but do not accept any more input. - Next state = FLUSHING - Return value = @code{BZ_FLUSH_OK} - -RUNNING/@code{BZ_FINISH} - Remember current value of @code{next_in}. Compress from @code{next_in} - to @code{next_out} as much as possible, but do not accept any more input. - Next state = FINISHING - Return value = @code{BZ_FINISH_OK} - -FLUSHING/@code{BZ_FLUSH} - Compress from @code{next_in} to @code{next_out} as much as possible, - but do not accept any more input. - If all the existing input has been used up and all compressed - output has been removed - Next state = RUNNING; Return value = @code{BZ_RUN_OK} - else - Next state = FLUSHING; Return value = @code{BZ_FLUSH_OK} - -FLUSHING/other - Illegal. - Return value = @code{BZ_SEQUENCE_ERROR} - -FINISHING/@code{BZ_FINISH} - Compress from @code{next_in} to @code{next_out} as much as possible, - but to not accept any more input. - If all the existing input has been used up and all compressed - output has been removed - Next state = IDLE; Return value = @code{BZ_STREAM_END} - else - Next state = FINISHING; Return value = @code{BZ_FINISHING} - -FINISHING/other - Illegal. - Return value = @code{BZ_SEQUENCE_ERROR} -@end display - -That still looks complicated? Well, fair enough. The usual sequence -of calls for compressing a load of data is: -@itemize @bullet -@item Get started with @code{BZ2_bzCompressInit}. -@item Shovel data in and shlurp out its compressed form using zero or more -calls of @code{BZ2_bzCompress} with action = @code{BZ_RUN}. -@item Finish up. -Repeatedly call @code{BZ2_bzCompress} with action = @code{BZ_FINISH}, -copying out the compressed output, until @code{BZ_STREAM_END} is returned. -@item Close up and go home. Call @code{BZ2_bzCompressEnd}. -@end itemize -If the data you want to compress fits into your input buffer all -at once, you can skip the calls of @code{BZ2_bzCompress ( ..., BZ_RUN )} and -just do the @code{BZ2_bzCompress ( ..., BZ_FINISH )} calls. - -All required memory is allocated by @code{BZ2_bzCompressInit}. The -compression library can accept any data at all (obviously). So you -shouldn't get any error return values from the @code{BZ2_bzCompress} calls. -If you do, they will be @code{BZ_SEQUENCE_ERROR}, and indicate a bug in -your programming. - -Trivial other possible return values: -@display - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL}, or @code{strm->s} is @code{NULL} -@end display - -@subsection @code{BZ2_bzCompressEnd} -@example -int BZ2_bzCompressEnd ( bz_stream *strm ); -@end example -Releases all memory associated with a compression stream. - -Possible return values: -@display - @code{BZ_PARAM_ERROR} if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL} - @code{BZ_OK} otherwise -@end display - - -@subsection @code{BZ2_bzDecompressInit} -@example -int BZ2_bzDecompressInit ( bz_stream *strm, int verbosity, int small ); -@end example -Prepares for decompression. As with @code{BZ2_bzCompressInit}, a -@code{bz_stream} record should be allocated and initialised before the -call. Fields @code{bzalloc}, @code{bzfree} and @code{opaque} should be -set if a custom memory allocator is required, or made @code{NULL} for -the normal @code{malloc}/@code{free} routines. Upon return, the internal -state will have been initialised, and @code{total_in} and -@code{total_out} will be zero. - -For the meaning of parameter @code{verbosity}, see @code{BZ2_bzCompressInit}. - -If @code{small} is nonzero, the library will use an alternative -decompression algorithm which uses less memory but at the cost of -decompressing more slowly (roughly speaking, half the speed, but the -maximum memory requirement drops to around 2300k). See Chapter 2 for -more information on memory management. - -Note that the amount of memory needed to decompress -a stream cannot be determined until the stream's header has been read, -so even if @code{BZ2_bzDecompressInit} succeeds, a subsequent -@code{BZ2_bzDecompress} could fail with @code{BZ_MEM_ERROR}. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{(small != 0 && small != 1)} - or @code{(verbosity < 0 || verbosity > 4)} - @code{BZ_MEM_ERROR} - if insufficient memory is available -@end display - -Allowable next actions: -@display - @code{BZ2_bzDecompress} - if @code{BZ_OK} was returned - no specific action required in case of error -@end display - - - -@subsection @code{BZ2_bzDecompress} -@example -int BZ2_bzDecompress ( bz_stream *strm ); -@end example -Provides more input and/out output buffer space for the library. The -caller maintains input and output buffers, and uses @code{BZ2_bzDecompress} -to transfer data between them. - -Before each call to @code{BZ2_bzDecompress}, @code{next_in} -should point at the compressed data, -and @code{avail_in} should indicate how many bytes the library -may read. @code{BZ2_bzDecompress} updates @code{next_in}, @code{avail_in} -and @code{total_in} -to reflect the number of bytes it has read. - -Similarly, @code{next_out} should point to a buffer in which the uncompressed -output is to be placed, with @code{avail_out} indicating how much output space -is available. @code{BZ2_bzCompress} updates @code{next_out}, -@code{avail_out} and @code{total_out} to reflect -the number of bytes output. - -You may provide and remove as little or as much data as you like on -each call of @code{BZ2_bzDecompress}. -In the limit, it is acceptable to -supply and remove data one byte at a time, although this would be -terribly inefficient. You should always ensure that at least one -byte of output space is available at each call. - -Use of @code{BZ2_bzDecompress} is simpler than @code{BZ2_bzCompress}. - -You should provide input and remove output as described above, and -repeatedly call @code{BZ2_bzDecompress} until @code{BZ_STREAM_END} is -returned. Appearance of @code{BZ_STREAM_END} denotes that -@code{BZ2_bzDecompress} has detected the logical end of the compressed -stream. @code{BZ2_bzDecompress} will not produce @code{BZ_STREAM_END} until -all output data has been placed into the output buffer, so once -@code{BZ_STREAM_END} appears, you are guaranteed to have available all -the decompressed output, and @code{BZ2_bzDecompressEnd} can safely be -called. - -If case of an error return value, you should call @code{BZ2_bzDecompressEnd} -to clean up and release memory. - -Possible return values: -@display - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL} - or @code{strm->avail_out < 1} - @code{BZ_DATA_ERROR} - if a data integrity error is detected in the compressed stream - @code{BZ_DATA_ERROR_MAGIC} - if the compressed stream doesn't begin with the right magic bytes - @code{BZ_MEM_ERROR} - if there wasn't enough memory available - @code{BZ_STREAM_END} - if the logical end of the data stream was detected and all - output in has been consumed, eg @code{s->avail_out > 0} - @code{BZ_OK} - otherwise -@end display -Allowable next actions: -@display - @code{BZ2_bzDecompress} - if @code{BZ_OK} was returned - @code{BZ2_bzDecompressEnd} - otherwise -@end display - - -@subsection @code{BZ2_bzDecompressEnd} -@example -int BZ2_bzDecompressEnd ( bz_stream *strm ); -@end example -Releases all memory associated with a decompression stream. - -Possible return values: -@display - @code{BZ_PARAM_ERROR} - if @code{strm} is @code{NULL} or @code{strm->s} is @code{NULL} - @code{BZ_OK} - otherwise -@end display - -Allowable next actions: -@display - None. -@end display - - -@section High-level interface - -This interface provides functions for reading and writing -@code{bzip2} format files. First, some general points. - -@itemize @bullet -@item All of the functions take an @code{int*} first argument, - @code{bzerror}. - After each call, @code{bzerror} should be consulted first to determine - the outcome of the call. If @code{bzerror} is @code{BZ_OK}, - the call completed - successfully, and only then should the return value of the function - (if any) be consulted. If @code{bzerror} is @code{BZ_IO_ERROR}, - there was an error - reading/writing the underlying compressed file, and you should - then consult @code{errno}/@code{perror} to determine the - cause of the difficulty. - @code{bzerror} may also be set to various other values; precise details are - given on a per-function basis below. -@item If @code{bzerror} indicates an error - (ie, anything except @code{BZ_OK} and @code{BZ_STREAM_END}), - you should immediately call @code{BZ2_bzReadClose} (or @code{BZ2_bzWriteClose}, - depending on whether you are attempting to read or to write) - to free up all resources associated - with the stream. Once an error has been indicated, behaviour of all calls - except @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) is undefined. - The implication is that (1) @code{bzerror} should - be checked after each call, and (2) if @code{bzerror} indicates an error, - @code{BZ2_bzReadClose} (@code{BZ2_bzWriteClose}) should then be called to clean up. -@item The @code{FILE*} arguments passed to - @code{BZ2_bzReadOpen}/@code{BZ2_bzWriteOpen} - should be set to binary mode. - Most Unix systems will do this by default, but other platforms, - including Windows and Mac, will not. If you omit this, you may - encounter problems when moving code to new platforms. -@item Memory allocation requests are handled by - @code{malloc}/@code{free}. - At present - there is no facility for user-defined memory allocators in the file I/O - functions (could easily be added, though). -@end itemize - - - -@subsection @code{BZ2_bzReadOpen} -@example - typedef void BZFILE; - - BZFILE *BZ2_bzReadOpen ( int *bzerror, FILE *f, - int small, int verbosity, - void *unused, int nUnused ); -@end example -Prepare to read compressed data from file handle @code{f}. @code{f} -should refer to a file which has been opened for reading, and for which -the error indicator (@code{ferror(f)})is not set. If @code{small} is 1, -the library will try to decompress using less memory, at the expense of -speed. - -For reasons explained below, @code{BZ2_bzRead} will decompress the -@code{nUnused} bytes starting at @code{unused}, before starting to read -from the file @code{f}. At most @code{BZ_MAX_UNUSED} bytes may be -supplied like this. If this facility is not required, you should pass -@code{NULL} and @code{0} for @code{unused} and n@code{Unused} -respectively. - -For the meaning of parameters @code{small} and @code{verbosity}, -see @code{BZ2_bzDecompressInit}. - -The amount of memory needed to decompress a file cannot be determined -until the file's header has been read. So it is possible that -@code{BZ2_bzReadOpen} returns @code{BZ_OK} but a subsequent call of -@code{BZ2_bzRead} will return @code{BZ_MEM_ERROR}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{f} is @code{NULL} - or @code{small} is neither @code{0} nor @code{1} - or @code{(unused == NULL && nUnused != 0)} - or @code{(unused != NULL && !(0 <= nUnused <= BZ_MAX_UNUSED))} - @code{BZ_IO_ERROR} - if @code{ferror(f)} is nonzero - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OK} - otherwise. -@end display - -Possible return values: -@display - Pointer to an abstract @code{BZFILE} - if @code{bzerror} is @code{BZ_OK} - @code{NULL} - otherwise -@end display - -Allowable next actions: -@display - @code{BZ2_bzRead} - if @code{bzerror} is @code{BZ_OK} - @code{BZ2_bzClose} - otherwise -@end display - - -@subsection @code{BZ2_bzRead} -@example - int BZ2_bzRead ( int *bzerror, BZFILE *b, void *buf, int len ); -@end example -Reads up to @code{len} (uncompressed) bytes from the compressed file -@code{b} into -the buffer @code{buf}. If the read was successful, -@code{bzerror} is set to @code{BZ_OK} -and the number of bytes read is returned. If the logical end-of-stream -was detected, @code{bzerror} will be set to @code{BZ_STREAM_END}, -and the number -of bytes read is returned. All other @code{bzerror} values denote an error. - -@code{BZ2_bzRead} will supply @code{len} bytes, -unless the logical stream end is detected -or an error occurs. Because of this, it is possible to detect the -stream end by observing when the number of bytes returned is -less than the number -requested. Nevertheless, this is regarded as inadvisable; you should -instead check @code{bzerror} after every call and watch out for -@code{BZ_STREAM_END}. - -Internally, @code{BZ2_bzRead} copies data from the compressed file in chunks -of size @code{BZ_MAX_UNUSED} bytes -before decompressing it. If the file contains more bytes than strictly -needed to reach the logical end-of-stream, @code{BZ2_bzRead} will almost certainly -read some of the trailing data before signalling @code{BZ_SEQUENCE_END}. -To collect the read but unused data once @code{BZ_SEQUENCE_END} has -appeared, call @code{BZ2_bzReadGetUnused} immediately before @code{BZ2_bzReadClose}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_PARAM_ERROR} - if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0} - @code{BZ_SEQUENCE_ERROR} - if @code{b} was opened with @code{BZ2_bzWriteOpen} - @code{BZ_IO_ERROR} - if there is an error reading from the compressed file - @code{BZ_UNEXPECTED_EOF} - if the compressed file ended before the logical end-of-stream was detected - @code{BZ_DATA_ERROR} - if a data integrity error was detected in the compressed stream - @code{BZ_DATA_ERROR_MAGIC} - if the stream does not begin with the requisite header bytes (ie, is not - a @code{bzip2} data file). This is really a special case of @code{BZ_DATA_ERROR}. - @code{BZ_MEM_ERROR} - if insufficient memory was available - @code{BZ_STREAM_END} - if the logical end of stream was detected. - @code{BZ_OK} - otherwise. -@end display - -Possible return values: -@display - number of bytes read - if @code{bzerror} is @code{BZ_OK} or @code{BZ_STREAM_END} - undefined - otherwise -@end display - -Allowable next actions: -@display - collect data from @code{buf}, then @code{BZ2_bzRead} or @code{BZ2_bzReadClose} - if @code{bzerror} is @code{BZ_OK} - collect data from @code{buf}, then @code{BZ2_bzReadClose} or @code{BZ2_bzReadGetUnused} - if @code{bzerror} is @code{BZ_SEQUENCE_END} - @code{BZ2_bzReadClose} - otherwise -@end display - - - -@subsection @code{BZ2_bzReadGetUnused} -@example - void BZ2_bzReadGetUnused ( int* bzerror, BZFILE *b, - void** unused, int* nUnused ); -@end example -Returns data which was read from the compressed file but was not needed -to get to the logical end-of-stream. @code{*unused} is set to the address -of the data, and @code{*nUnused} to the number of bytes. @code{*nUnused} will -be set to a value between @code{0} and @code{BZ_MAX_UNUSED} inclusive. - -This function may only be called once @code{BZ2_bzRead} has signalled -@code{BZ_STREAM_END} but before @code{BZ2_bzReadClose}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_PARAM_ERROR} - if @code{b} is @code{NULL} - or @code{unused} is @code{NULL} or @code{nUnused} is @code{NULL} - @code{BZ_SEQUENCE_ERROR} - if @code{BZ_STREAM_END} has not been signalled - or if @code{b} was opened with @code{BZ2_bzWriteOpen} - @code{BZ_OK} - otherwise -@end display - -Allowable next actions: -@display - @code{BZ2_bzReadClose} -@end display - - -@subsection @code{BZ2_bzReadClose} -@example - void BZ2_bzReadClose ( int *bzerror, BZFILE *b ); -@end example -Releases all memory pertaining to the compressed file @code{b}. -@code{BZ2_bzReadClose} does not call @code{fclose} on the underlying file -handle, so you should do that yourself if appropriate. -@code{BZ2_bzReadClose} should be called to clean up after all error -situations. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_SEQUENCE_ERROR} - if @code{b} was opened with @code{BZ2_bzOpenWrite} - @code{BZ_OK} - otherwise -@end display - -Allowable next actions: -@display - none -@end display - - - -@subsection @code{BZ2_bzWriteOpen} -@example - BZFILE *BZ2_bzWriteOpen ( int *bzerror, FILE *f, - int blockSize100k, int verbosity, - int workFactor ); -@end example -Prepare to write compressed data to file handle @code{f}. -@code{f} should refer to -a file which has been opened for writing, and for which the error -indicator (@code{ferror(f)})is not set. - -For the meaning of parameters @code{blockSize100k}, -@code{verbosity} and @code{workFactor}, see -@* @code{BZ2_bzCompressInit}. - -All required memory is allocated at this stage, so if the call -completes successfully, @code{BZ_MEM_ERROR} cannot be signalled by a -subsequent call to @code{BZ2_bzWrite}. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{f} is @code{NULL} - or @code{blockSize100k < 1} or @code{blockSize100k > 9} - @code{BZ_IO_ERROR} - if @code{ferror(f)} is nonzero - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OK} - otherwise -@end display - -Possible return values: -@display - Pointer to an abstract @code{BZFILE} - if @code{bzerror} is @code{BZ_OK} - @code{NULL} - otherwise -@end display - -Allowable next actions: -@display - @code{BZ2_bzWrite} - if @code{bzerror} is @code{BZ_OK} - (you could go directly to @code{BZ2_bzWriteClose}, but this would be pretty pointless) - @code{BZ2_bzWriteClose} - otherwise -@end display - - - -@subsection @code{BZ2_bzWrite} -@example - void BZ2_bzWrite ( int *bzerror, BZFILE *b, void *buf, int len ); -@end example -Absorbs @code{len} bytes from the buffer @code{buf}, eventually to be -compressed and written to the file. - -Possible assignments to @code{bzerror}: -@display - @code{BZ_PARAM_ERROR} - if @code{b} is @code{NULL} or @code{buf} is @code{NULL} or @code{len < 0} - @code{BZ_SEQUENCE_ERROR} - if b was opened with @code{BZ2_bzReadOpen} - @code{BZ_IO_ERROR} - if there is an error writing the compressed file. - @code{BZ_OK} - otherwise -@end display - - - - -@subsection @code{BZ2_bzWriteClose} -@example - void BZ2_bzWriteClose ( int *bzerror, BZFILE* f, - int abandon, - unsigned int* nbytes_in, - unsigned int* nbytes_out ); - - void BZ2_bzWriteClose64 ( int *bzerror, BZFILE* f, - int abandon, - unsigned int* nbytes_in_lo32, - unsigned int* nbytes_in_hi32, - unsigned int* nbytes_out_lo32, - unsigned int* nbytes_out_hi32 ); -@end example - -Compresses and flushes to the compressed file all data so far supplied -by @code{BZ2_bzWrite}. The logical end-of-stream markers are also written, so -subsequent calls to @code{BZ2_bzWrite} are illegal. All memory associated -with the compressed file @code{b} is released. -@code{fflush} is called on the -compressed file, but it is not @code{fclose}'d. - -If @code{BZ2_bzWriteClose} is called to clean up after an error, the only -action is to release the memory. The library records the error codes -issued by previous calls, so this situation will be detected -automatically. There is no attempt to complete the compression -operation, nor to @code{fflush} the compressed file. You can force this -behaviour to happen even in the case of no error, by passing a nonzero -value to @code{abandon}. - -If @code{nbytes_in} is non-null, @code{*nbytes_in} will be set to be the -total volume of uncompressed data handled. Similarly, @code{nbytes_out} -will be set to the total volume of compressed data written. For -compatibility with older versions of the library, @code{BZ2_bzWriteClose} -only yields the lower 32 bits of these counts. Use -@code{BZ2_bzWriteClose64} if you want the full 64 bit counts. These -two functions are otherwise absolutely identical. - - -Possible assignments to @code{bzerror}: -@display - @code{BZ_SEQUENCE_ERROR} - if @code{b} was opened with @code{BZ2_bzReadOpen} - @code{BZ_IO_ERROR} - if there is an error writing the compressed file - @code{BZ_OK} - otherwise -@end display - -@subsection Handling embedded compressed data streams - -The high-level library facilitates use of -@code{bzip2} data streams which form some part of a surrounding, larger -data stream. -@itemize @bullet -@item For writing, the library takes an open file handle, writes -compressed data to it, @code{fflush}es it but does not @code{fclose} it. -The calling application can write its own data before and after the -compressed data stream, using that same file handle. -@item Reading is more complex, and the facilities are not as general -as they could be since generality is hard to reconcile with efficiency. -@code{BZ2_bzRead} reads from the compressed file in blocks of size -@code{BZ_MAX_UNUSED} bytes, and in doing so probably will overshoot -the logical end of compressed stream. -To recover this data once decompression has -ended, call @code{BZ2_bzReadGetUnused} after the last call of @code{BZ2_bzRead} -(the one returning @code{BZ_STREAM_END}) but before calling -@code{BZ2_bzReadClose}. -@end itemize - -This mechanism makes it easy to decompress multiple @code{bzip2} -streams placed end-to-end. As the end of one stream, when @code{BZ2_bzRead} -returns @code{BZ_STREAM_END}, call @code{BZ2_bzReadGetUnused} to collect the -unused data (copy it into your own buffer somewhere). -That data forms the start of the next compressed stream. -To start uncompressing that next stream, call @code{BZ2_bzReadOpen} again, -feeding in the unused data via the @code{unused}/@code{nUnused} -parameters. -Keep doing this until @code{BZ_STREAM_END} return coincides with the -physical end of file (@code{feof(f)}). In this situation -@code{BZ2_bzReadGetUnused} -will of course return no data. - -This should give some feel for how the high-level interface can be used. -If you require extra flexibility, you'll have to bite the bullet and get -to grips with the low-level interface. - -@subsection Standard file-reading/writing code -Here's how you'd write data to a compressed file: -@example @code -FILE* f; -BZFILE* b; -int nBuf; -char buf[ /* whatever size you like */ ]; -int bzerror; -int nWritten; - -f = fopen ( "myfile.bz2", "w" ); -if (!f) @{ - /* handle error */ -@} -b = BZ2_bzWriteOpen ( &bzerror, f, 9 ); -if (bzerror != BZ_OK) @{ - BZ2_bzWriteClose ( b ); - /* handle error */ -@} - -while ( /* condition */ ) @{ - /* get data to write into buf, and set nBuf appropriately */ - nWritten = BZ2_bzWrite ( &bzerror, b, buf, nBuf ); - if (bzerror == BZ_IO_ERROR) @{ - BZ2_bzWriteClose ( &bzerror, b ); - /* handle error */ - @} -@} - -BZ2_bzWriteClose ( &bzerror, b ); -if (bzerror == BZ_IO_ERROR) @{ - /* handle error */ -@} -@end example -And to read from a compressed file: -@example -FILE* f; -BZFILE* b; -int nBuf; -char buf[ /* whatever size you like */ ]; -int bzerror; -int nWritten; - -f = fopen ( "myfile.bz2", "r" ); -if (!f) @{ - /* handle error */ -@} -b = BZ2_bzReadOpen ( &bzerror, f, 0, NULL, 0 ); -if (bzerror != BZ_OK) @{ - BZ2_bzReadClose ( &bzerror, b ); - /* handle error */ -@} - -bzerror = BZ_OK; -while (bzerror == BZ_OK && /* arbitrary other conditions */) @{ - nBuf = BZ2_bzRead ( &bzerror, b, buf, /* size of buf */ ); - if (bzerror == BZ_OK) @{ - /* do something with buf[0 .. nBuf-1] */ - @} -@} -if (bzerror != BZ_STREAM_END) @{ - BZ2_bzReadClose ( &bzerror, b ); - /* handle error */ -@} else @{ - BZ2_bzReadClose ( &bzerror ); -@} -@end example - - - -@section Utility functions -@subsection @code{BZ2_bzBuffToBuffCompress} -@example - int BZ2_bzBuffToBuffCompress( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int blockSize100k, - int verbosity, - int workFactor ); -@end example -Attempts to compress the data in @code{source[0 .. sourceLen-1]} -into the destination buffer, @code{dest[0 .. *destLen-1]}. -If the destination buffer is big enough, @code{*destLen} is -set to the size of the compressed data, and @code{BZ_OK} is -returned. If the compressed data won't fit, @code{*destLen} -is unchanged, and @code{BZ_OUTBUFF_FULL} is returned. - -Compression in this manner is a one-shot event, done with a single call -to this function. The resulting compressed data is a complete -@code{bzip2} format data stream. There is no mechanism for making -additional calls to provide extra input data. If you want that kind of -mechanism, use the low-level interface. - -For the meaning of parameters @code{blockSize100k}, @code{verbosity} -and @code{workFactor}, @* see @code{BZ2_bzCompressInit}. - -To guarantee that the compressed data will fit in its buffer, allocate -an output buffer of size 1% larger than the uncompressed data, plus -six hundred extra bytes. - -@code{BZ2_bzBuffToBuffDecompress} will not write data at or -beyond @code{dest[*destLen]}, even in case of buffer overflow. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL} - or @code{blockSize100k < 1} or @code{blockSize100k > 9} - or @code{verbosity < 0} or @code{verbosity > 4} - or @code{workFactor < 0} or @code{workFactor > 250} - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OUTBUFF_FULL} - if the size of the compressed data exceeds @code{*destLen} - @code{BZ_OK} - otherwise -@end display - - - -@subsection @code{BZ2_bzBuffToBuffDecompress} -@example - int BZ2_bzBuffToBuffDecompress ( char* dest, - unsigned int* destLen, - char* source, - unsigned int sourceLen, - int small, - int verbosity ); -@end example -Attempts to decompress the data in @code{source[0 .. sourceLen-1]} -into the destination buffer, @code{dest[0 .. *destLen-1]}. -If the destination buffer is big enough, @code{*destLen} is -set to the size of the uncompressed data, and @code{BZ_OK} is -returned. If the compressed data won't fit, @code{*destLen} -is unchanged, and @code{BZ_OUTBUFF_FULL} is returned. - -@code{source} is assumed to hold a complete @code{bzip2} format -data stream. @* @code{BZ2_bzBuffToBuffDecompress} tries to decompress -the entirety of the stream into the output buffer. - -For the meaning of parameters @code{small} and @code{verbosity}, -see @code{BZ2_bzDecompressInit}. - -Because the compression ratio of the compressed data cannot be known in -advance, there is no easy way to guarantee that the output buffer will -be big enough. You may of course make arrangements in your code to -record the size of the uncompressed data, but such a mechanism is beyond -the scope of this library. - -@code{BZ2_bzBuffToBuffDecompress} will not write data at or -beyond @code{dest[*destLen]}, even in case of buffer overflow. - -Possible return values: -@display - @code{BZ_CONFIG_ERROR} - if the library has been mis-compiled - @code{BZ_PARAM_ERROR} - if @code{dest} is @code{NULL} or @code{destLen} is @code{NULL} - or @code{small != 0 && small != 1} - or @code{verbosity < 0} or @code{verbosity > 4} - @code{BZ_MEM_ERROR} - if insufficient memory is available - @code{BZ_OUTBUFF_FULL} - if the size of the compressed data exceeds @code{*destLen} - @code{BZ_DATA_ERROR} - if a data integrity error was detected in the compressed data - @code{BZ_DATA_ERROR_MAGIC} - if the compressed data doesn't begin with the right magic bytes - @code{BZ_UNEXPECTED_EOF} - if the compressed data ends unexpectedly - @code{BZ_OK} - otherwise -@end display - - - -@section @code{zlib} compatibility functions -Yoshioka Tsuneo has contributed some functions to -give better @code{zlib} compatibility. These functions are -@code{BZ2_bzopen}, @code{BZ2_bzread}, @code{BZ2_bzwrite}, @code{BZ2_bzflush}, -@code{BZ2_bzclose}, -@code{BZ2_bzerror} and @code{BZ2_bzlibVersion}. -These functions are not (yet) officially part of -the library. If they break, you get to keep all the pieces. -Nevertheless, I think they work ok. -@example -typedef void BZFILE; - -const char * BZ2_bzlibVersion ( void ); -@end example -Returns a string indicating the library version. -@example -BZFILE * BZ2_bzopen ( const char *path, const char *mode ); -BZFILE * BZ2_bzdopen ( int fd, const char *mode ); -@end example -Opens a @code{.bz2} file for reading or writing, using either its name -or a pre-existing file descriptor. -Analogous to @code{fopen} and @code{fdopen}. -@example -int BZ2_bzread ( BZFILE* b, void* buf, int len ); -int BZ2_bzwrite ( BZFILE* b, void* buf, int len ); -@end example -Reads/writes data from/to a previously opened @code{BZFILE}. -Analogous to @code{fread} and @code{fwrite}. -@example -int BZ2_bzflush ( BZFILE* b ); -void BZ2_bzclose ( BZFILE* b ); -@end example -Flushes/closes a @code{BZFILE}. @code{BZ2_bzflush} doesn't actually do -anything. Analogous to @code{fflush} and @code{fclose}. - -@example -const char * BZ2_bzerror ( BZFILE *b, int *errnum ) -@end example -Returns a string describing the more recent error status of -@code{b}, and also sets @code{*errnum} to its numerical value. - - -@section Using the library in a @code{stdio}-free environment - -@subsection Getting rid of @code{stdio} - -In a deeply embedded application, you might want to use just -the memory-to-memory functions. You can do this conveniently -by compiling the library with preprocessor symbol @code{BZ_NO_STDIO} -defined. Doing this gives you a library containing only the following -eight functions: - -@code{BZ2_bzCompressInit}, @code{BZ2_bzCompress}, @code{BZ2_bzCompressEnd} @* -@code{BZ2_bzDecompressInit}, @code{BZ2_bzDecompress}, @code{BZ2_bzDecompressEnd} @* -@code{BZ2_bzBuffToBuffCompress}, @code{BZ2_bzBuffToBuffDecompress} - -When compiled like this, all functions will ignore @code{verbosity} -settings. - -@subsection Critical error handling -@code{libbzip2} contains a number of internal assertion checks which -should, needless to say, never be activated. Nevertheless, if an -assertion should fail, behaviour depends on whether or not the library -was compiled with @code{BZ_NO_STDIO} set. - -For a normal compile, an assertion failure yields the message -@example - bzip2/libbzip2: internal error number N. - This is a bug in bzip2/libbzip2, 1.0 of 21-Mar-2000. - Please report it to me at: jseward@@acm.org. If this happened - when you were using some program which uses libbzip2 as a - component, you should also report this bug to the author(s) - of that program. Please make an effort to report this bug; - timely and accurate bug reports eventually lead to higher - quality software. Thanks. Julian Seward, 21 March 2000. -@end example -where @code{N} is some error code number. @code{exit(3)} -is then called. - -For a @code{stdio}-free library, assertion failures result -in a call to a function declared as: -@example - extern void bz_internal_error ( int errcode ); -@end example -The relevant code is passed as a parameter. You should supply -such a function. - -In either case, once an assertion failure has occurred, any -@code{bz_stream} records involved can be regarded as invalid. -You should not attempt to resume normal operation with them. - -You may, of course, change critical error handling to suit -your needs. As I said above, critical errors indicate bugs -in the library and should not occur. All "normal" error -situations are indicated via error return codes from functions, -and can be recovered from. - - -@section Making a Windows DLL -Everything related to Windows has been contributed by Yoshioka Tsuneo -@* (@code{QWF00133@@niftyserve.or.jp} / -@code{tsuneo-y@@is.aist-nara.ac.jp}), so you should send your queries to -him (but perhaps Cc: me, @code{jseward@@acm.org}). - -My vague understanding of what to do is: using Visual C++ 5.0, -open the project file @code{libbz2.dsp}, and build. That's all. - -If you can't -open the project file for some reason, make a new one, naming these files: -@code{blocksort.c}, @code{bzlib.c}, @code{compress.c}, -@code{crctable.c}, @code{decompress.c}, @code{huffman.c}, @* -@code{randtable.c} and @code{libbz2.def}. You will also need -to name the header files @code{bzlib.h} and @code{bzlib_private.h}. - -If you don't use VC++, you may need to define the proprocessor symbol -@code{_WIN32}. - -Finally, @code{dlltest.c} is a sample program using the DLL. It has a -project file, @code{dlltest.dsp}. - -If you just want a makefile for Visual C, have a look at -@code{makefile.msc}. - -Be aware that if you compile @code{bzip2} itself on Win32, you must set -@code{BZ_UNIX} to 0 and @code{BZ_LCCWIN32} to 1, in the file -@code{bzip2.c}, before compiling. Otherwise the resulting binary won't -work correctly. - -I haven't tried any of this stuff myself, but it all looks plausible. - - - -@chapter Miscellanea - -These are just some random thoughts of mine. Your mileage may -vary. - -@section Limitations of the compressed file format -@code{bzip2-1.0}, @code{0.9.5} and @code{0.9.0} -use exactly the same file format as the previous -version, @code{bzip2-0.1}. This decision was made in the interests of -stability. Creating yet another incompatible compressed file format -would create further confusion and disruption for users. - -Nevertheless, this is not a painless decision. Development -work since the release of @code{bzip2-0.1} in August 1997 -has shown complexities in the file format which slow down -decompression and, in retrospect, are unnecessary. These are: -@itemize @bullet -@item The run-length encoder, which is the first of the - compression transformations, is entirely irrelevant. - The original purpose was to protect the sorting algorithm - from the very worst case input: a string of repeated - symbols. But algorithm steps Q6a and Q6b in the original - Burrows-Wheeler technical report (SRC-124) show how - repeats can be handled without difficulty in block - sorting. -@item The randomisation mechanism doesn't really need to be - there. Udi Manber and Gene Myers published a suffix - array construction algorithm a few years back, which - can be employed to sort any block, no matter how - repetitive, in O(N log N) time. Subsequent work by - Kunihiko Sadakane has produced a derivative O(N (log N)^2) - algorithm which usually outperforms the Manber-Myers - algorithm. - - I could have changed to Sadakane's algorithm, but I find - it to be slower than @code{bzip2}'s existing algorithm for - most inputs, and the randomisation mechanism protects - adequately against bad cases. I didn't think it was - a good tradeoff to make. Partly this is due to the fact - that I was not flooded with email complaints about - @code{bzip2-0.1}'s performance on repetitive data, so - perhaps it isn't a problem for real inputs. - - Probably the best long-term solution, - and the one I have incorporated into 0.9.5 and above, - is to use the existing sorting - algorithm initially, and fall back to a O(N (log N)^2) - algorithm if the standard algorithm gets into difficulties. -@item The compressed file format was never designed to be - handled by a library, and I have had to jump though - some hoops to produce an efficient implementation of - decompression. It's a bit hairy. Try passing - @code{decompress.c} through the C preprocessor - and you'll see what I mean. Much of this complexity - could have been avoided if the compressed size of - each block of data was recorded in the data stream. -@item An Adler-32 checksum, rather than a CRC32 checksum, - would be faster to compute. -@end itemize -It would be fair to say that the @code{bzip2} format was frozen -before I properly and fully understood the performance -consequences of doing so. - -Improvements which I was able to incorporate into -0.9.0, despite using the same file format, are: -@itemize @bullet -@item Single array implementation of the inverse BWT. This - significantly speeds up decompression, presumably - because it reduces the number of cache misses. -@item Faster inverse MTF transform for large MTF values. The - new implementation is based on the notion of sliding blocks - of values. -@item @code{bzip2-0.9.0} now reads and writes files with @code{fread} - and @code{fwrite}; version 0.1 used @code{putc} and @code{getc}. - Duh! Well, you live and learn. - -@end itemize -Further ahead, it would be nice -to be able to do random access into files. This will -require some careful design of compressed file formats. - - - -@section Portability issues -After some consideration, I have decided not to use -GNU @code{autoconf} to configure 0.9.5 or 1.0. - -@code{autoconf}, admirable and wonderful though it is, -mainly assists with portability problems between Unix-like -platforms. But @code{bzip2} doesn't have much in the way -of portability problems on Unix; most of the difficulties appear -when porting to the Mac, or to Microsoft's operating systems. -@code{autoconf} doesn't help in those cases, and brings in a -whole load of new complexity. - -Most people should be able to compile the library and program -under Unix straight out-of-the-box, so to speak, especially -if you have a version of GNU C available. - -There are a couple of @code{__inline__} directives in the code. GNU C -(@code{gcc}) should be able to handle them. If you're not using -GNU C, your C compiler shouldn't see them at all. -If your compiler does, for some reason, see them and doesn't -like them, just @code{#define} @code{__inline__} to be @code{/* */}. One -easy way to do this is to compile with the flag @code{-D__inline__=}, -which should be understood by most Unix compilers. - -If you still have difficulties, try compiling with the macro -@code{BZ_STRICT_ANSI} defined. This should enable you to build the -library in a strictly ANSI compliant environment. Building the program -itself like this is dangerous and not supported, since you remove -@code{bzip2}'s checks against compressing directories, symbolic links, -devices, and other not-really-a-file entities. This could cause -filesystem corruption! - -One other thing: if you create a @code{bzip2} binary for public -distribution, please try and link it statically (@code{gcc -s}). This -avoids all sorts of library-version issues that others may encounter -later on. - -If you build @code{bzip2} on Win32, you must set @code{BZ_UNIX} to 0 and -@code{BZ_LCCWIN32} to 1, in the file @code{bzip2.c}, before compiling. -Otherwise the resulting binary won't work correctly. - - - -@section Reporting bugs -I tried pretty hard to make sure @code{bzip2} is -bug free, both by design and by testing. Hopefully -you'll never need to read this section for real. - -Nevertheless, if @code{bzip2} dies with a segmentation -fault, a bus error or an internal assertion failure, it -will ask you to email me a bug report. Experience with -version 0.1 shows that almost all these problems can -be traced to either compiler bugs or hardware problems. -@itemize @bullet -@item -Recompile the program with no optimisation, and see if it -works. And/or try a different compiler. -I heard all sorts of stories about various flavours -of GNU C (and other compilers) generating bad code for -@code{bzip2}, and I've run across two such examples myself. - -2.7.X versions of GNU C are known to generate bad code from -time to time, at high optimisation levels. -If you get problems, try using the flags -@code{-O2} @code{-fomit-frame-pointer} @code{-fno-strength-reduce}. -You should specifically @emph{not} use @code{-funroll-loops}. - -You may notice that the Makefile runs six tests as part of -the build process. If the program passes all of these, it's -a pretty good (but not 100%) indication that the compiler has -done its job correctly. -@item -If @code{bzip2} crashes randomly, and the crashes are not -repeatable, you may have a flaky memory subsystem. @code{bzip2} -really hammers your memory hierarchy, and if it's a bit marginal, -you may get these problems. Ditto if your disk or I/O subsystem -is slowly failing. Yup, this really does happen. - -Try using a different machine of the same type, and see if -you can repeat the problem. -@item This isn't really a bug, but ... If @code{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. That absolutely -will cause the file to be non-decompressible. You'll have to transfer -it again. -@end itemize - -If you've incorporated @code{libbzip2} into your own program -and are getting problems, please, please, please, check that the -parameters you are passing in calls to the library, are -correct, and in accordance with what the documentation says -is allowable. I have tried to make the library robust against -such problems, but I'm sure I haven't succeeded. - -Finally, if the above comments don't help, you'll have to send -me a bug report. Now, it's just amazing how many people will -send me a bug report saying something like -@display - bzip2 crashed with segmentation fault on my machine -@end display -and absolutely nothing else. Needless to say, a such a report -is @emph{totally, utterly, completely and comprehensively 100% useless; -a waste of your time, my time, and net bandwidth}. -With no details at all, there's no way I can possibly begin -to figure out what the problem is. - -The rules of the game are: facts, facts, facts. Don't omit -them because "oh, they won't be relevant". At the bare -minimum: -@display - Machine type. Operating system version. - Exact version of @code{bzip2} (do @code{bzip2 -V}). - Exact version of the compiler used. - Flags passed to the compiler. -@end display -However, the most important single thing that will help me is -the file that you were trying to compress or decompress at the -time the problem happened. Without that, my ability to do anything -more than speculate about the cause, is limited. - -Please remember that I connect to the Internet with a modem, so -you should contact me before mailing me huge files. - - -@section Did you get the right package? - -@code{bzip2} is a resource hog. It soaks up large amounts of CPU cycles -and memory. Also, it gives very large latencies. In the worst case, you -can feed many megabytes of uncompressed data into the library before -getting any compressed output, so this probably rules out applications -requiring interactive behaviour. - -These aren't faults of my implementation, I hope, but more -an intrinsic property of the Burrows-Wheeler transform (unfortunately). -Maybe this isn't what you want. - -If you want a compressor and/or library which is faster, uses less -memory but gets pretty good compression, and has minimal latency, -consider Jean-loup -Gailly's and Mark Adler's work, @code{zlib-1.1.2} and -@code{gzip-1.2.4}. Look for them at - -@code{http://www.cdrom.com/pub/infozip/zlib} and -@code{http://www.gzip.org} respectively. - -For something faster and lighter still, you might try Markus F X J -Oberhumer's @code{LZO} real-time compression/decompression library, at -@* @code{http://wildsau.idv.uni-linz.ac.at/mfx/lzo.html}. - -If you want to use the @code{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. Instead, -I've made a special library tuned for that kind of use. It's part of -@code{e2compr-0.40}, an on-the-fly disk compressor for the Linux -@code{ext2} filesystem. Look at -@code{http://www.netspace.net.au/~reiter/e2compr}. - - - -@section Testing - -A record of the tests I've done. - -First, some data sets: -@itemize @bullet -@item B: a directory containing 6001 files, one for every length in the - range 0 to 6000 bytes. The files contain random lowercase - letters. 18.7 megabytes. -@item H: my home directory tree. Documents, source code, mail files, - compressed data. H contains B, and also a directory of - files designed as boundary cases for the sorting; mostly very - repetitive, nasty files. 565 megabytes. -@item A: directory tree holding various applications built from source: - @code{egcs}, @code{gcc-2.8.1}, KDE, GTK, Octave, etc. - 2200 megabytes. -@end itemize -The tests conducted are as follows. Each test means compressing -(a copy of) each file in the data set, decompressing it and -comparing it against the original. - -First, a bunch of tests with block sizes and internal buffer -sizes set very small, -to detect any problems with the -blocking and buffering mechanisms. -This required modifying the source code so as to try to -break it. -@enumerate -@item Data set H, with - buffer size of 1 byte, and block size of 23 bytes. -@item Data set B, buffer sizes 1 byte, block size 1 byte. -@item As (2) but small-mode decompression. -@item As (2) with block size 2 bytes. -@item As (2) with block size 3 bytes. -@item As (2) with block size 4 bytes. -@item As (2) with block size 5 bytes. -@item As (2) with block size 6 bytes and small-mode decompression. -@item H with buffer size of 1 byte, but normal block - size (up to 900000 bytes). -@end enumerate -Then some tests with unmodified source code. -@enumerate -@item H, all settings normal. -@item As (1), with small-mode decompress. -@item H, compress with flag @code{-1}. -@item H, compress with flag @code{-s}, decompress with flag @code{-s}. -@item Forwards compatibility: H, @code{bzip2-0.1pl2} compressing, - @code{bzip2-0.9.5} decompressing, all settings normal. -@item Backwards compatibility: H, @code{bzip2-0.9.5} compressing, - @code{bzip2-0.1pl2} decompressing, all settings normal. -@item Bigger tests: A, all settings normal. -@item As (7), using the fallback (Sadakane-like) sorting algorithm. -@item As (8), compress with flag @code{-1}, decompress with flag - @code{-s}. -@item H, using the fallback sorting algorithm. -@item Forwards compatibility: A, @code{bzip2-0.1pl2} compressing, - @code{bzip2-0.9.5} decompressing, all settings normal. -@item Backwards compatibility: A, @code{bzip2-0.9.5} compressing, - @code{bzip2-0.1pl2} decompressing, all settings normal. -@item Misc test: about 400 megabytes of @code{.tar} files with - @code{bzip2} compiled with Checker (a memory access error - detector, like Purify). -@item Misc tests to make sure it builds and runs ok on non-Linux/x86 - platforms. -@end enumerate -These tests were conducted on a 225 MHz IDT WinChip machine, running -Linux 2.0.36. They represent nearly a week of continuous computation. -All tests completed successfully. - - -@section Further reading -@code{bzip2} is not research work, in the sense that it doesn't present -any new ideas. Rather, it's an engineering exercise based on existing -ideas. - -Four documents describe essentially all the ideas behind @code{bzip2}: -@example -Michael Burrows and D. J. Wheeler: - "A block-sorting lossless data compression algorithm" - 10th May 1994. - Digital SRC Research Report 124. - ftp://ftp.digital.com/pub/DEC/SRC/research-reports/SRC-124.ps.gz - If you have trouble finding it, try searching at the - New Zealand Digital Library, http://www.nzdl.org. - -Daniel S. Hirschberg and Debra A. LeLewer - "Efficient Decoding of Prefix Codes" - Communications of the ACM, April 1990, Vol 33, Number 4. - You might be able to get an electronic copy of this - from the ACM Digital Library. - -David J. Wheeler - Program bred3.c and accompanying document bred3.ps. - This contains the idea behind the multi-table Huffman - coding scheme. - ftp://ftp.cl.cam.ac.uk/users/djw3/ - -Jon L. Bentley and Robert Sedgewick - "Fast Algorithms for Sorting and Searching Strings" - Available from Sedgewick's web page, - www.cs.princeton.edu/~rs -@end example -The following paper gives valuable additional insights into the -algorithm, but is not immediately the basis of any code -used in bzip2. -@example -Peter Fenwick: - Block Sorting Text Compression - Proceedings of the 19th Australasian Computer Science Conference, - Melbourne, Australia. Jan 31 - Feb 2, 1996. - ftp://ftp.cs.auckland.ac.nz/pub/peter-f/ACSC96paper.ps -@end example -Kunihiko Sadakane's sorting algorithm, mentioned above, -is available from: -@example -http://naomi.is.s.u-tokyo.ac.jp/~sada/papers/Sada98b.ps.gz -@end example -The Manber-Myers suffix array construction -algorithm is described in a paper -available from: -@example -http://www.cs.arizona.edu/people/gene/PAPERS/suffix.ps -@end example -Finally, the following paper documents some recent investigations -I made into the performance of sorting algorithms: -@example -Julian Seward: - On the Performance of BWT Sorting Algorithms - Proceedings of the IEEE Data Compression Conference 2000 - Snowbird, Utah. 28-30 March 2000. -@end example - - -@contents - -@bye - |