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Brotli is an open source data compression library developed by Jyrki Alakuijala and Zoltan Szabadka.〔(【引用サイトリンク】title=Brotli Compressed Data Format )〕〔(【引用サイトリンク】title=Brotli Source Code - GitHub )〕 Brotli is based on a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling. Replacing deflate with brotli typically gives an increase of 20% in compression density for text files, while compression and decompression speeds are roughly unchanged. The first release of brotli in 2013 was built for off-line compression of web fonts.〔(Google Developers Blog: Smaller Fonts with WOFF 2.0 and unicode-range )〕 The version of brotli released in September 2015 has been extended to perform competitively in generic lossless data compression, with particular emphasis on use for HTTP compression. The encoder has been partly rewritten, the compression ratio improved, both the encoder and the decoder have been sped up, the streaming API was improved, more compression quality levels have been added, performance has been improved across platforms, decoding memory use has been reduced, and more use cases are taken into account.〔 Brotli uses a pre-defined static dictionary of more than 13,000 strings to "warm up" its internal state. The dictionary contains common words, phrases and other substrings derived from a large corpus of text and HTML documents. Streams compressed with Brotli have the proposed content encoding type "br". Like zopfli, another compression algorithm from Google, brotli is named after a Swiss bakery product, brötli.〔(Google Open Source Blog: Introducing Brotli: a new compression algorithm for the internet )〕 ==References== 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「Brotli」の詳細全文を読む スポンサード リンク
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