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|discontinued = |latest release version = 1.20|latest release date = |latest preview version = |latest preview date = |frequently updated = |programming language = |operating system = |platform = |size = |language = |status = |genre = |license = GNU GPLv3|website = (www.advancemame.it/comp-readme )}} AdvanceCOMP is a set of cross-platform command line data (re-)compression tools. The utilities allow modifying an ''already-compressed'' file, with the intent of reducing the file-size by optimising the compressed representation. The AdvanceCOMP suite is freely available under the terms of the GPLv3 license. AdvanceCOMP works with files using the LZ/Huffman-based compression algorithm known as DEFLATE, the most widely used compression encoding systems in use. A large number of file-formats include DEFLATE as part of their specification, most notably PNG, gzip and ZIP. == The DEFLATE encoding == DEFLATE specifies a stream-encoding such that any compliant ''decoder'' is able to parse any valid stream; the algorithm and program used for the compression stage are ''not'' mandated. For generation of compressed sections of DEFLATE data, an encoder available in the zlib/gzip reference implementation has typically been utilised. The zlib/gzip compressor offers the user a sliding scale between CPU usage and the likely amount of reduction in size achieved on a range of -0 (no compression) to -9 (maximum gzip compression).The 7-Zip and Zopfli DEFLATE encoders, used in the AdvanceCOMP suite, effectively extend the sliding scale further. A much more detailed search of compression ''possibilities'' is performed, at the expense of significant further processor time spent searching. Effectively, the 10-point scale used in gzip is extended to include extra settings above -9, the previous maximum search level. There will be no difference in decompression ''speed'', regardless of the level of compressed size achieved or time taken to encode the data.抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AdvanceCOMP」の詳細全文を読む スポンサード リンク
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