![]() ![]() ![]() Methods 1 to 7 are historical and are not in use. The ZIP format supports several compression methods: 0 - The file is stored (no compression)Ģ - The file is Reduced with compression factor 1ģ - The file is Reduced with compression factor 2Ĥ - The file is Reduced with compression factor 3ĥ - The file is Reduced with compression factor 4ħ - Reserved for Tokenizing compression algorithmĩ - Enhanced Deflating using Deflate64(tm)ġ0 - PKWARE Data Compression Library Imploding (old IBM TERSE)ġ2 - File is compressed using BZIP2 algorithmġ8 - File is compressed using IBM TERSE (new)ĩ9 - AE-x encryption marker (see APPENDIX E) The files, as well as the directory structure, can optionally be encrypted. It is an archive format that stores files and their directory structure, where each file is individually compressed. The ZIP format was developed by Phil Katz as an open format with an open specification, where his implementation, PKZIP, was shareware. The zlib library provides Deflate compression and decompression code for use by zip, gzip, png (which uses the zlib wrapper on deflate data), and many other applications. Often gzip is used in combination with tar to make a compressed archive format. gz gzip format is for single files, also using the Deflate compression method. zip is an archive format using, usually, the Deflate compression method.
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