<?php
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namespace PhpZip\Constants;
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/**
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* Compression levels for Deflate and BZIP2.
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*
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* {@see https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT} Section 4.4.4:
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*
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* For Methods 8 and 9 - Deflating
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* -------------------------------
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* Bit 2 Bit 1
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* 0 0 Normal (-en) compression option was used.
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* 0 1 Maximum (-exx/-ex) compression option was used.
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* 1 0 Fast (-ef) compression option was used.
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* 1 1 Super Fast (-es) compression option was used.
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*
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* Different programs encode compression level information in different ways:
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*
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* Deflate Compress Level pkzip zip 7z, WinRAR WinZip
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* ---------------------- ---------------- ------- ---------- ------
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* Super Fast compression 1 1
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* Fast compression 2 1, 2
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* Normal Compression 3 - 8 (5 default) 3 - 7 1 - 9
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* Maximum compression 9 8, 9 9
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*/
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interface ZipCompressionLevel
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{
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/** @var int Compression level for super fast compression. */
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const SUPER_FAST = 1;
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/** @var int compression level for fast compression */
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const FAST = 2;
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/** @var int compression level for normal compression */
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const NORMAL = 5;
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/** @var int compression level for maximum compression */
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const MAXIMUM = 9;
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/**
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* @var int int Minimum compression level
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*
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* @internal
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*/
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const LEVEL_MIN = self::SUPER_FAST;
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/**
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* @var int int Maximum compression level
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*
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* @internal
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*/
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const LEVEL_MAX = self::MAXIMUM;
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}
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