About 7-Zip Format

Description

For further information, please visit http://www.7-zip.org

7z is a new archive format, providing high compression ratio. The main features of the 7z format:

• Open architecture
• High compression ratio
• Strong AES-256 encryption
• Ability of using any compression, conversion or encryption method
• Supporting files with sizes up to 16000000000 GB
• Unicode file names
• Solid compressing
• Archive headers compressing

7z has open architecture, so it can support any new compression methods.

LZMA is the default and general compression method of 7z format. The main features of the LZMA method:

• High compression ratio
• Variable dictionary size (up to 4 GB)
• Compressing speed: about 1 MB/s on 2 GHz CPU
• Decompressing speed: about 10-20 MB/s on 2 GHz CPU
• Small memory requirements for decompressing (depend from dictionary size)
• Small code size for decompressing: about 5 KB
• Supporting multi-threading and P4's hyper-threading

The LZMA compression algorithm is very suitable for embedded applications. If you want to use LZMA code, you can ask for consultations, custom code programming, and required developer licenses at

www.7-zip.org/support.html

External links for developers:

• 7-Zip on SourceForge
• Delphi TSevenZipVCL
• 7-zip32.dll library project

Performance

FILE SET: The GIMP 1.2.4 for Windows after full installation (127 subfolders, 1304 files totaling 27,128,826 bytes). The GIMP is the GNU Image Manipulation Program. It can be downloaded from www.gimp.org.

From "7-Zip" documentation - copyright Igor Pavlov.

Technical Notes

The 7-Zip compression system of Paquet Builder is based on 7-Zip 4.42, the latest stable version available.

7-Zip Self-Extractors made with Paquet Builder do not support PPMD, BZip2 nor Deflate methods because LZMA and BCJ/BCJ2 are enough to achieve good compression ratios.