Short: 7za file archiver with high compression ratio Author: http://p7zip.sourceforge.net/ Uploader: Marcin 'Korni' Kornas Type: util/arc Version: 16.02 Requires: ixemul.library >= 50.17 Architecture: ppc-morphos p7zip 16.02 =========== Homepage : http://p7zip.sourceforge.net/ p7zip is a port of the Windows programs 7z.exe and 7za.exe provided by 7-zip. 7-zip is a file archiver with the highest compression ratio. Homepage : www.7-zip.org 7z uses plugins (7z.so and Codecs/Rar.so) to handle archives. 7za is a stand-alone executable (7za handles less archive formats than 7z). 7zr is a light stand-alone executable that supports only 7z/LZMA/BCJ/BCJ2. Some GUI : 7zG : beta stage 7zFM : alpha stage CAUTION : --------- - FIRST : DO NOT USE the 7-zip format for backup purpose on Linux/Unix because : - 7-zip does not store the owner/group of the file On Linux/Unix, in order to backup directories you must use tar ! to backup a directory : tar cf - directory | 7za a -si directory.tar.7z to restore your backup : 7za x -so directory.tar.7z | tar xf - - if you want to send files and directories (not the owner of file) to others Unix/MacOS/Windows users, you can use the 7-zip format. example : 7za a directory.7z directory do not use "-r" because this flag does not do what you think do not use "directory/*" because of ".*" files (example : "directory/*" does not match "directory/.profile") USAGE: ------ Remark : you can replace 7za with 7z. 7za t archive.7z : tests files in the archive archive.7z 7za l archive.7z : lists all files from archive archive.7z 7za x archive.7z : extracts all files from archive archive.7z to the current directory 7za a archive.7z file1 fileN : add files to the archive archive.7z 7za a archive.7z dir1 : add all files and subdirectories from directory "dir1" to archive archive.7z CAUTION : do not use the flag "-r" unless you know what you are doing ... 7za a -sfx archive.x dir1 : add all files from directory "dir1" to SFX archive archive.x You can also add or extract files to/from .zip or .tar archives. You can also compress/uncompress .gz or .bz2 files. 7za a -tzip archive.zip file file2 file3 7za a -ttar archive.tar file 7za a -tgzip file.gz file 7za a -tbzip2 archive.bz2 file You can use password for archives: 7za a -pmy_password archive.7z dir1 For .7z archive only, you can enable archive header encryption with "-mhe" 7za a -mhe=on -pmy_password archive.7z dir1 For more, see the documentation of 7za.exe in DOC/MANUAL directory 7za a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on archive.7z dir1 adds all files from directory "dir1" to archive archive.7z using "ultra settings". -t7z : 7z archive -m0=lzma : lzma method -mx=9 : level of compression = 9 (Ultra) -mfb=64 : number of fast bytes for LZMA = 64 -md=32m : dictionary size = 32 megabytes -ms=on : solid archive = on To use the new codec "lzma2" 7za a -m0=lzma2 archive.7z directory BENCHMARKS : ------------ 7za b : bench LZMA codec 7z b -mm=crc : make internal crc check. 7za b "-mm=*" : test all methods hugetlbfs (large pages) : ------------------------- Using huges pages in Linux requires some preparations. First, make sure your running kernel has support for hugetlbfs compiled in: ~$ grep hugetlbfs /proc/filesystems nodev hugetlbfs You can view your current huge page configuration like this: ~$ grep Huge /proc/meminfo HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB In this case the size of a huge page is 2 MiB. So, if you have 2 GiB of RAM and want to reserve 512 MiB for huge pages, you would need 256 pages. Do the following as root: ~# echo 296 >/proc/sys/vm/nr_hugepages ~# grep Huge /proc/meminfo HugePages_Total: 296 HugePages_Free: 296 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB Finally, make access from user space possible: ~# mkdir /hugepages ~# mount -t hugetlbfs -o rw,nosuid,nodev,noexec,noatime none /hugepages ~# chmod 1777 /hugepages Option 1 : Now huge pages are configured. In your shell, set the environment variable HUGETLB_PATH to the mount point: ~$ export HUGETLB_PATH=/hugepages or Option 2 : Let p7zip find out the first directory with the type "hugetlbfs" To enable huge page use in p7zip, pass the '-slp' switch to it. Ex: 7za -slp a t.7z dir If you want this to be a permanent setup : - mkdir /hugepages - add an entry to your /etc/fstab so that when you reboot your computer, your hugetlbfs will mount automatically : hugetlbfs /hugepages hugetlbfs rw,nosuid,nodev,noexec,noatime 0 0 - add this in your /etc/rc.local : chmod 1777 /hugepages echo 296 > /proc/sys/vm/nr_hugepages optional : export HUGETLB_PATH=/hugepages To enable huge page use in p7zip, pass the '-slp' switch to it : 7za -slp b Remark : with current CPU : "7za -slp b" is not faster than "7za b". If you want to see some speedup, compress at least 300MB Ex : 7za -slp -mx=9 -a big_file.tar.7z big_file.tar LICENSE : --------- please read copyright file. LIMITATIONS from 7-zip : ------------------------ - does not support uid/gid for the .tar format (so, use tar on Unix) LIMITATIONS for Unix version only : ----------------------------------- - can handle properly UNICODE filenames only if the environment is UTF-8. Example : export LANG=en_US.UTF-8 ; unset LC_CTYPE Remark : see the possible values for LANG in the directory - /usr/lib/locale : Fedora 2 / Solaris 8 - /usr/share/locale : OpenBSD / Debian / FreeBSD / MacOS X / Mandrake 10.1 / NetBSD On Linux, to display the available locales : locale -a p7zip relies on LC_CTYPE and then on LANG to convert name to/from UNICODE. the command "locale" should display these environment variables. you can also do "echo $LC_CTYPE" and "echo $LANG". If you do not plan to export your archive, you can use the flag "-no-utf16". Usage : 7za a -no-utf16 archive.7z dirOrFile1 ... dirOrFileN 7za t -no-utf16 archive.7z 7za l -no-utf16 archive.7z 7za x -no-utf16 archive.7z - ignores Windows file access permissions (files are created with default permissions) see also TODO file. DEVELOPPER CORNER: ------------------ - static analysis with cppcheck make cppcheck - static analysis with clang scan-build make all4 2>&1 | tee -i scan-build.out - dynamic analysis : valgrind cp makefile.linux_valgrind makefile.machine make test - dynamic analysis : gcc sanitize cp makefile.linux_amd64_sanitizer makefile.machine make test - WaitForMultipleObject has no equivalence on Unix. - Events don't exist. - sizeof(wchar_t) = 4 with GCC (2 with MS VC++) - "FIXME" in source code indicates that you should add codes to better handle all cases. - "FIXED" in source code indicates that the original code has been changed to work in Unix environment. see also TODO file.