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//opt/alt/php54/usr/share/pear/data/Archive/design/design.txt
eZ publish Enterprise Component: Archive, Design ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Introduction ============ Purpose of the Archive package ------------------------------ The archive package takes care of the different archive and compression formats and handles them universally. Archive provides the basic implementation to extract and create the whole or a part of the archive. Some research will be done during the design phase whether the PHP stream wrapper classes can be used to provide a common interface. Current implementation ---------------------- The current implementation implements only the Tar archive. The implemented algorithm doesn't support many (or if possible all) Tar archive-types. Furthermore, a clean up of the design and code will be done to provide a better interface. Requirements ============ Design goals ------------ The Archive package should (at least) provide a low-level interface where simply (a part of) the files can be extracted to a specific location or an archive can be extended with new files. On top of this interface a part of a virtual file system can be build. In another package? Design ====== Introduction ------------ In the design we make a distinction between archivers and compression libraries. If a format supports both, it is categorized as an archiver. The compression libraries, if not available in PHP, will be implemented as a stream. The stream functions from PHP have a different resource handler for files and directories. Therefore they are hard to combine and makes it impractical to use them in an archive (which is streamed). Supported file formats ---------------------- Archivers: Tar, is a pure archive format. Zip, is an archive plus compression algorithm. Compressions: gzip, implemented as stream in PHP (zlib). bzip2, implemented as stream in PHP (bzip2). Since the most common compression formats are already available in PHP, we can simple use the stream functions to access them. (And use them directly in the archiver).