B1 is an open archive file format that supports data compression and archiving[citation needed]. B1 files use the file extension ".b1" or ".B1" and the MIME media type application/x-b1. B1 incorporates the LZMA compression algorithm.[1] B1 archive combines a number of files and folders into one or more volumes, optionally adding compression and encryption. Construction of the B1 archive involves creating a binary stream of records and building volumes of that stream. The B1 archive format supports password-based AES-256 encryption.[2] B1 files are created and opened with its native open-source B1 Pack Tool, as well as B1 Free Archiver utility.[3][4]
| Filename extension |
.b1 |
|---|---|
| Internet media type |
application/x-b1 |
| Developed by | Catalina Group Ltd |
| Initial release | 2011 |
| Type of format | Data compression |
B1 Pack Project
editB1 Pack is an open-source software project that produces a cross-platform command-line tool and a Java library for creating and extracting file archives in the B1 archive format. Source code of the project is published at GitHub.[5] B1 Pack Project is released under the Apache License.[6] The B1 Pack Tool module builds a single executable JAR file which can create, list, and extract B1 archive files from a command-line interface.[7]
B1 format features
edit- Support for Unicode names for files inside an archive.
- Archives and the files inside it can be of any size.
- Support for split archives, that consist of several parts.
- Integrity check with the Adler-32 algorithm.
- Data compression using the LZMA algorithm.
- Supports encryption with the AES algorithm.[8]
API features
edit- Instant creation of an archive without reading from/writing to a file system.
- Producing only a byte range of an archive, e.g. for resuming downloads.
- Streaming archive content without prior knowledge of all the files being packaged.
References
edit- ^ "B1 File Format" Whatis.com. Retrieved 13 January 2014.
- ^ "B1 file extension - B1 compressed archive" File-Extensions.org. Retrieved 13 January 2014.
- ^ "B1 File Extension" Fileinfo. Retrieved 14 January 2014.
- ^ "Extract compressed files without any software" Archived 2014-01-21 at the Wayback Machine Digital Quest. Retrieved 13 January 2014.
- ^ "B1-Pack" GitHub. Retrieved 13 January 2014.
- ^ "The Apache Software License, v2.0" Retrieved 14 January 2014.
- ^ "B1 Pack CLI" Retrieved 13 January 2014.
- ^ "B1 Pack Project" Retrieved 14 January 2014.