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7-Zip is free software with open source. The most of the code is under the GNU LGPL license.Some parts of the code are under the BSD 3-clause License. Also there is unRAR license restriction for some parts of the code.Read 7-Zip License information.
Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format.And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs.
It's possible that new version of 7-Zip can solve your problems with 7z archives.So download latest version of 7-Zip and try to use that new version.You can try also latest alpha or beta version.If new version also doesn't help, read this manual.
7z archive consists of 4 main blocks of data: Start Header (32 bytes): it contains signature and link to End Header Compressed Data of files Compressed Metadata Block for files: it contains links to Compressed Data, information about compression methods, CRC, file names, sizes, timestamps and so on. End Header: it contains link to Compressed Metadata Block. Note: If 7z archive contains only one file without encryption, 7-Zip stores Metadata for that file in End Header in uncompressed form, and there are only 3 main blocks in that case.Archive exampleArchive example: a.7z (3740 bytes) that contains 5 files compressed with LZMA method.Start of archive:
There are some possible cases when archive is corrupted: You can open archive and you can see the list of files, but when you press Extract or Test command, there are some errors: Data Error or CRC Error. When you open archive, you get message \"Can not open file 'a.7z' as archive\"Corruption case: Data errors or CRC errors for files inside archiveHere we describe the case, when you can open archive and you see the list of files, but when you press Extract or Test command, there are some errors: Data Error or CRC Error.
If archive was compressed in \"Solid\" mode, and you have exact copies ofsome files from archive, you can create similar archive with good copies of files with same settings and in same order, and replace \"bad\" parts of bad.7z with \"good\" parts from another good.7z. You must look listings of files in bad and good archives, logs of \"test\" command, and think about ways to replace bad parts.The are no more instructions here for that corruption case.
For example, if you have multi-volume archive: a.7z.001, ... , a.7z.009, but one part a.7z.008 is missing,just copy a.7z.007 to file a.7z.008, and 7-Zip will see correct size of archive.Or if some part was reduced, look the size of another parts and restore original (correct) size of \"bad\" part, so total size will be correct again, and 7-zip will be able to open headers.
Note: If archive is multi-volume, uncompleted Start Header is also possible, if first volume was copied before end of archive (last volume) was written.In that case archive is not corrupted. And 7-Zip can unpack such archive, if total size is correct and if there is correct End Header.
If there is no End Header, you can not recover file names, timestamps, and another metadata, but probably it's possible to recover some data as raw file, and then it's possible to recover data from raw file with some parser.
Create readme.txt.bz2, readme.zip, readme.txt.gzip and readme.txt.xz archives from readme.txt. Create a.7z with LZMA method that contains all files: readme.txt.bz2 readme.txt.gz readme.zip readme.txt readme.txt.xzWe have a.7z (3740 bytes). You can look that file in hex editor.It must have structure similar to structure of 7z file described above.
Now we currupt a.7z archive. We want to split archive into two parts: a.7z.001: Start Header, some part of Compressed Data a.7z.002: Some part of Compressed Data, Metadata, End HeaderMetadata block with End Header are not big for our test archive (smaller than 300 bytes).
We have two parts: a.7z.001 (3000 bytes) and a.7z.002 (740 bytes).Then we copy a.7z.001 to bad.7z and try to open bad.7z. And we getthe message \"Can not open file 'bad.7z' as archive\", so we have corrupted archive.
If LZMA method was used, then first byte in compressed data is always 0 and high bit of second byte is also 0. So if we see 00 in first byte and from 00 to 7F in second byte, probably LZMA method was used (not LZMA2).
So we select some big file for that new archive. In some cases you can use even bad.7z as that big file. But we use 7-zip.chm. We rename 7-zip.chm (91020 bytes) to file raw.dat and we compress raw.dat to raw.7z with LZMA method with big dictionary size value. The dictionary size must be equal or larger than dictionary size in bad.7z.
We call \"Split file...\" function for raw.7z and type \"32 2968 100G\" in \"Split to volumes, bytes:\" field. Note that the value 2968 is equal to size of \"bad.7z.002\". When you recover real archive, you must use exact size of your bad.7z.002.
7-Zip parser can find archives in raw file. But it doesn't recognize another files, like xml, html, jpg, png files and so on. So probably you need some another parser software to extract files from raw file.
7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as \"archives\". It is developed by Igor Pavlov and was first released in 1999.[2] 7-Zip has its own archive format called 7z, but can read and write several others.
The program can be used from a Windows graphical user interface that also features shell integration, from a Windows command-line interface as the command 7za.exe, and from POSIX systems as p7zip.[12] Most of the 7-Zip source code is under the LGPL-2.1-or-later license; the unRAR code, however, is under the LGPL-2.1-or-later license with an \"unRAR restriction\", which states that developers are not permitted to use the code to reverse-engineer the RAR compression algorithm.[13][14]
By default, 7-Zip creates 7z-format archives with a .7z file extension. Each archive can contain multiple directories and files. As a container format, security or size reduction are achieved by looking for similarities throughout the data using a stacked combination of filters. These can consist of pre-processors, compression algorithms, and encryption filters.
The core 7z compression uses a variety of algorithms, the most common of which are bzip2, PPMd, LZMA2, and LZMA. Developed by Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA uses an LZ-based sliding dictionary of up to 3840 MB in size, backed by a range coder.[15]
7-Zip supports a number of other compression and non-compression archive formats (both for packing and unpacking), including ZIP, gzip, bzip2, xz, tar, and WIM. The utility also supports unpacking APM, ar, ARJ, chm, cpio, deb, FLV, JAR, LHA/LZH, LZMA, MSLZ, Office Open XML, onepkg, RAR, RPM, smzip, SWF, XAR, and Z archives and cramfs, DMG, FAT, HFS, ISO, MBR, NTFS, SquashFS, UDF, and VHD disk images. 7-Zip supports the ZIPX format for unpacking only. It has had this support since at least version 9.20, which was released in late 2010.
7-Zip can open some MSI files, allowing access to the meta-files within along with the main contents. Some Microsoft CAB (LZX compression) and NSIS (LZMA) installer formats can be opened. Similarly, some Microsoft executable programs (.EXEs) that are self-extracting archives or otherwise contain archived content (e.g., some setup files) may be opened as archives.
When compressing ZIP or gzip files, 7-Zip uses its own DEFLATE encoder, which may achieve higher compression, but at lower speed, than the more common zlib DEFLATE implementation. The 7-Zip deflate encoder implementation is available separately as part of the AdvanceCOMP suite of tools.
The decompression engine for RAR archives was developed using freely available source code of the unRAR program, which has a licensing restriction against creation of a RAR compressor. 7-Zip v15.06 and later support extraction of files in the RAR5 format.[19] Some backup systems use formats supported by archiving programs such as 7-Zip; e.g., some Android backups are in tar format, and can be extracted by archivers such as 7-Zip.[20]
7-Zip comes with a file manager along with the standard archiver tools. The file manager has a toolbar with options to create an archive, extract an archive, test an archive to detect errors, copy, move, and delete files, and open a file properties menu exclusive to 7-Zip. The file manager, by default, displays hidden files because it does not follow Windows Explorer's policies. The tabs show name, modification time, original and compressed sizes, attributes, and comments (4DOS descript.ion format).
Two command-line versions are provided: 7z.exe, using external libraries; and a standalone executable 7za.exe, containing built-in modules, but with compression/decompression support limited to 7z, ZIP, gzip, bzip2, Z and tar formats. A 64-bit version is available, with support for large memory maps, leading to faster compression. All versions support multi-threading.
7-Zip has a LZMA SDK which was originally dual-licensed under both the GNU LGPL and Common Public License,[28] with an additional special exception for linked binaries. On 2 December 2008, the SDK was placed by Igor Pavlov in the public domain.[11]
On older versions, self-extracting archives were vulnerable to arbitrary code execution through DLL hijacking: they load and run a DLL named UXTheme.dll, if it is in the same folder as the executable file.[29][30][31] 7-Zip 16.03 Release notes say that the installer and SFX modules have added protection against DLL preloading attack.[2]
On TechRepublic in 2009, Justin James found the detailed settings for Windows File Manager integration were \"appreciated\" and called the compression-decompression benchmark utility \"neat\". And though the archive dialog has settings that \"will confound most users\", he concluded: \"7-Zip fits a nice niche in between the built-in Windows capabilities and the features of the paid products, and it is able to handle a large variety of file formats in the process.\"[34] 59ce067264