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class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading">模組:Crc32lua</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="前往另一种语言写成的文章。4种语言可用" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-4" aria-hidden="true" > 4种语言 </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Modul:Crc32lua" title="Modul:Crc32lua – 马来语" lang="ms" hreflang="ms" data-title="Modul:Crc32lua" data-language-autonym="Bahasa Melayu" data-language-local-name="马来语" class="interlanguage-link-target">Bahasa Melayu</a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E6%A8%A1%E5%9D%97:Crc32lua" title="模块:Crc32lua – 吴语" lang="wuu" hreflang="wuu" data-title="模块:Crc32lua" data-language-autonym="吴语" data-language-local-name="吴语" class="interlanguage-link-target">吴语</a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/%E6%A8%A1%E7%B5%84:Crc32lua" title="模組:Crc32lua – 闽南语" lang="nan" hreflang="nan" data-title="模組:Crc32lua" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="闽南语" class="interlanguage-link-target">閩南語 / Bân-lâm-gú</a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%A8%A1%E7%B5%84:Crc32lua" title="模組:Crc32lua – 粤语" lang="yue" hreflang="yue" data-title="模組:Crc32lua" data-language-autonym="粵語" data-language-local-name="粤语" class="interlanguage-link-target">粵語</a></li> </ul> <div class="after-portlet after-portlet-lang"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q20823059#sitelinks-wikipedia" title="编辑跨语言链接" class="wbc-editpage">编辑链接</a></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="命名空间"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-module" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Module:Crc32lua" title="查看模块页面[c]" accesskey="c">模块</a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Module_talk:Crc32lua" rel="discussion" title="关于此页面的讨论[t]" accesskey="t">讨论</a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="更改语言变体" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" >English </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="查看"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Module:Crc32lua">阅读</a></li><li id="ca-viewsource" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Module:Crc32lua&action=edit" title="该页面已被保护。你可以查看该页源码。[e]" accesskey="e">查看源代码</a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Module:Crc32lua&action=history" title="本页面的早前版本。[h]" accesskey="h">查看历史</a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="页面工具"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="工具" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" >工具 </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">工具</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">移至侧栏</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">隐藏</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="更多选项" > <div class="vector-menu-heading"> 操作 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Module:Crc32lua">阅读</a></li><li id="ca-more-viewsource" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Module:Crc32lua&action=edit">查看源代码</a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Module:Crc32lua&action=history">查看历史</a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> 常规 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:%E9%93%BE%E5%85%A5%E9%A1%B5%E9%9D%A2/Module:Crc32lua" title="列出所有与本页相链的页面[j]" accesskey="j">链入页面</a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:%E9%93%BE%E5%87%BA%E6%9B%B4%E6%94%B9/Module:Crc32lua" rel="nofollow" title="页面链出所有页面的更改[k]" accesskey="k">相关更改</a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Project:%E4%B8%8A%E4%BC%A0" title="上传图像或多媒体文件[u]" accesskey="u">上传文件</a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:%E7%89%B9%E6%AE%8A%E9%A1%B5%E9%9D%A2" title="全部特殊页面的列表[q]" accesskey="q">特殊页面</a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Module:Crc32lua&oldid=53358919" title="此页面该修订版本的固定链接">固定链接</a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Module:Crc32lua&action=info" title="关于此页面的更多信息">页面信息</a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Special:URL%E7%BC%A9%E7%9F%AD%E7%A8%8B%E5%BA%8F&url=https%3A%2F%2Fzh.wikipedia.org%2Fwiki%2FModule%3ACrc32lua">获取短链接</a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Special:QrCode&url=https%3A%2F%2Fzh.wikipedia.org%2Fwiki%2FModule%3ACrc32lua">下载二维码</a></li> </ul> </div> </div> <div id="p-electronpdfservice-sidebar-portlet-heading" class="vector-menu mw-portlet mw-portlet-electronpdfservice-sidebar-portlet-heading" > <div class="vector-menu-heading"> 打印/导出 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="electron-print_pdf" class="mw-list-item"><a href="/w/index.php?title=Special:DownloadAsPdf&page=Module%3ACrc32lua&action=show-download-screen">下载为PDF</a></li><li id="t-print" class="mw-list-item"><a href="javascript:print();" rel="alternate" title="本页面的可打印版本[p]" accesskey="p">打印页面</a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> 在其他项目中 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Module:Crc32lua" hreflang="en">维基共享资源</a></li><li class="wb-otherproject-link wb-otherproject-mediawiki mw-list-item"><a href="https://www.mediawiki.org/wiki/Module:Crc32lua" hreflang="en">MediaWiki</a></li><li class="wb-otherproject-link wb-otherproject-meta mw-list-item"><a href="https://meta.wikimedia.org/wiki/Module:Crc32lua" hreflang="en">元维基</a></li><li class="wb-otherproject-link wb-otherproject-wikibooks mw-list-item"><a href="https://zh.wikibooks.org/wiki/Module:Crc32lua" hreflang="zh">维基教科书</a></li><li class="wb-otherproject-link wb-otherproject-wikinews mw-list-item"><a href="https://zh.wikinews.org/wiki/Module:Crc32lua" hreflang="zh">维基新闻</a></li><li class="wb-otherproject-link wb-otherproject-wikiquote mw-list-item"><a href="https://zh.wikiquote.org/wiki/Module:Crc32lua" hreflang="zh">维基语录</a></li><li class="wb-otherproject-link wb-otherproject-wikisource mw-list-item"><a href="https://zh.wikisource.org/wiki/Module:Crc32lua" hreflang="zh">维基文库</a></li><li class="wb-otherproject-link wb-otherproject-wikiversity mw-list-item"><a href="https://zh.wikiversity.org/wiki/Module:Crc32lua" hreflang="zh">维基学院</a></li><li class="wb-otherproject-link wb-otherproject-wikivoyage mw-list-item"><a href="https://zh.wikivoyage.org/wiki/Module:Crc32lua" hreflang="zh">维基导游</a></li><li class="wb-otherproject-link wb-otherproject-wiktionary mw-list-item"><a href="https://zh.wiktionary.org/wiki/Module:Crc32lua" hreflang="zh">维基词典</a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q20823059" title="链接到连接的数据仓库项目[g]" accesskey="g">维基数据项目</a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="页面工具"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="外观"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">外观</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">移至侧栏</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">隐藏</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> <div id="mw-indicator-noteTA-e5a4a1f1" class="mw-indicator"><div class="mw-parser-output"><img alt="本页使用了标题或全文手工转换" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Zh_conversion_icon_m.svg/35px-Zh_conversion_icon_m.svg.png" decoding="async" width="35" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Zh_conversion_icon_m.svg/53px-Zh_conversion_icon_m.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Zh_conversion_icon_m.svg/70px-Zh_conversion_icon_m.svg.png 2x" data-file-width="32" data-file-height="20" /></div></div> <div id="mw-indicator-pp-default" class="mw-indicator"><div class="mw-parser-output"><a href="/wiki/Wikipedia:%E4%BF%9D%E8%AD%B7%E6%96%B9%E9%87%9D#全保护" title="此高风险模块已被永久全保护，以避免破坏"><img alt="被永久保护的模块" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Full-protection-shackle-block.svg/20px-Full-protection-shackle-block.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Full-protection-shackle-block.svg/30px-Full-protection-shackle-block.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/12/Full-protection-shackle-block.svg/40px-Full-protection-shackle-block.svg.png 2x" data-file-width="512" data-file-height="512" /></a></div></div> </div> <div id="siteSub" class="noprint">维基百科，自由的百科全书</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="zh" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r84589015">.mw-parser-output .documentation,.mw-parser-output .documentation-metadata{border:1px solid #a2a9b1;background-color:#ecfcf4;clear:both}.mw-parser-output .documentation{margin:1em 0 0 0;padding:1em}.mw-parser-output .documentation-metadata{margin:0.2em 0;font-size:small;padding:0.4em 1em}.mw-parser-output .documentation-startbox{padding-bottom:3px;border-bottom:1px solid #aaa;margin-bottom:1ex}.mw-parser-output .documentation-heading{font-weight:bold;font-size:125%}.mw-parser-output .documentation-clear{clear:both}.mw-parser-output .documentation-toolbar{font-style:normal;font-size:85%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .documentation,html.skin-theme-clientpref-night .mw-parser-output .documentation-metadata{background-color:#0b1e1c}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .documentation,html.skin-theme-clientpref-os .mw-parser-output .documentation-metadata{background-color:#0b1e1c}}</style><div class="documentation-container" role="complementary" aria-labelledby="documentation-heading"> <div class="documentation"> <div class="documentation-startbox"> <img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/Test_Template_Info-Icon_-_Version_%282%29.svg/50px-Test_Template_Info-Icon_-_Version_%282%29.svg.png" decoding="async" width="50" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/Test_Template_Info-Icon_-_Version_%282%29.svg/75px-Test_Template_Info-Icon_-_Version_%282%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/43/Test_Template_Info-Icon_-_Version_%282%29.svg/100px-Test_Template_Info-Icon_-_Version_%282%29.svg.png 2x" data-file-width="1792" data-file-height="800" /> 模块文档[<a href="/wiki/Module:Crc32lua/doc" title="Module:Crc32lua/doc">查看</a>] [<a href="/wiki/Special:%E7%BC%96%E8%BE%91%E9%A1%B5%E9%9D%A2/Module:Crc32lua/doc" title="Special:编辑页面/Module:Crc32lua/doc">编辑</a>] [<a href="/wiki/Special:%E9%A1%B5%E9%9D%A2%E5%8E%86%E5%8F%B2/Module:Crc32lua/doc" title="Special:页面历史/Module:Crc32lua/doc">历史</a>] [<a href="/wiki/Special:%E5%88%B7%E6%96%B0/Module:Crc32lua" title="Special:刷新/Module:Crc32lua">清除缓存</a>]</div> <div id="noteTA-e5a4a1f1" class="noteTA"><div class="noteTA-group"><div data-noteta-group-source="module" data-noteta-group="MediaWiki special"></div></div></div> <a href="/wiki/CRC32" class="mw-redirect" title="CRC32">CRC32</a>的纯Lua实现。 补充：<a href="https://www.mediawiki.org/wiki/Extension:Scribunto" class="extiw" title="mw:Extension:Scribunto">Scribunto</a>提供的标准库中，提供了<a href="https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#mw.hash.hashValue" class="extiw" title="mw:Extension:Scribunto/Lua reference manual"><code>mw.hash.hashValue()</code></a>可以用于生成散列值，其实际上是调用<a href="/wiki/PHP" title="PHP">PHP</a>的<a rel="nofollow" class="external text" href="https://www.php.net/manual/en/function.hash.php">hash()</a>方法，其中PHP的hash支持算法中，包括三个crc32，分别是crc32、crc32b、crc32c；本lua模块实现的对应就是前面的crc32b，其输出值是前述调用输出字节原值的十进制值（即<code>mw.hash.hashValue()</code>字节原值的十六进制值）。所以如有性能需要且入参为字符串的话，可以考虑用Scribunto提供的基础库实现代替（标准库提供的只支持字符串入参，不支持字节串入参，尽管PHP的实现是支持的）。 <div class="documentation-clear"></div> </div> <div role="note" class="documentation-metadata plainlinks">上述<a href="/wiki/Wikipedia:%E6%A8%A1%E6%9D%BF%E6%96%87%E6%AA%94%E9%A0%81%E6%A8%A1%E5%BC%8F" class="mw-redirect" title="Wikipedia:模板文檔頁模式">文档</a><a href="/wiki/Wikipedia:%E5%B5%8C%E5%85%A5%E5%8C%85%E5%90%AB" title="Wikipedia:嵌入包含">嵌入</a>自<a href="/wiki/Module:Crc32lua/doc" title="Module:Crc32lua/doc">Module:Crc32lua/doc</a>。 (<a href="/wiki/Special:%E7%BC%96%E8%BE%91%E9%A1%B5%E9%9D%A2/Module:Crc32lua/doc" title="Special:编辑页面/Module:Crc32lua/doc">编辑</a> | <a href="/wiki/Special:%E9%A1%B5%E9%9D%A2%E5%8E%86%E5%8F%B2/Module:Crc32lua/doc" title="Special:页面历史/Module:Crc32lua/doc">历史</a>) 编者可以在本模块的沙盒 (<a class="external text" href="https://zh.wikipedia.org/w/index.php?title=Module:Crc32lua/sandbox&action=edit&preload=Template%3ADocumentation%2Fpreload-module-sandbox">创建</a> | <a class="external text" href="https://zh.wikipedia.org/w/index.php?title=Module:Crc32lua/sandbox&preload=Module%3ACrc32lua&action=edit&summary=%E5%BB%BA%E7%AB%8B%5B%5BModule%3ACrc32lua%5D%5D%E7%9A%84%E6%B2%99%E7%9B%92%E7%89%88%E6%9C%AC">镜像</a>)和测试样例 (<a class="external text" href="https://zh.wikipedia.org/w/index.php?title=Module:Crc32lua/testcases&action=edit&preload=Template%3ADocumentation%2Fpreload-module-testcases">创建</a>)页面进行实验。 <a href="/wiki/Special:%E5%89%8D%E7%BC%80%E7%B4%A2%E5%BC%95/Module:Crc32lua/" title="Special:前缀索引/Module:Crc32lua/">本模块的子页面</a>。</div></div> <div class="mw-highlight mw-highlight-lang-lua mw-content-ltr mw-highlight-lines" dir="ltr"><pre><a href="#L-1"></a>--[[ <a href="#L-2"></a> <a href="#L-3"></a>LUA MODULE <a href="#L-4"></a> <a href="#L-5"></a> digest.crc32 - CRC-32 checksum implemented entirely in Lua. <a href="#L-6"></a> <a href="#L-7"></a>SYNOPSIS <a href="#L-8"></a> <a href="#L-9"></a> local CRC = require 'digest.crc32lua' <a href="#L-10"></a> print(CRC.crc32 'test') --> 0xD87F7E0C or -662733300 <a href="#L-11"></a> <a href="#L-12"></a> assert(CRC.crc32('st', CRC.crc32('te')) == CRC.crc32 'test') <a href="#L-13"></a> <a href="#L-14"></a>DESCRIPTION <a href="#L-15"></a> <a href="#L-16"></a> This can be used to compute CRC-32 checksums on strings. <a href="#L-17"></a> This is similar to [1-2]. <a href="#L-18"></a> <a href="#L-19"></a>API <a href="#L-20"></a> <a href="#L-21"></a> Note: in the functions below, checksums are 32-bit integers stored in <a href="#L-22"></a> numbers. The number format currently depends on the bit <a href="#L-23"></a> implementation--see DESIGN NOTES below. <a href="#L-24"></a> <a href="#L-25"></a> CRC.crc32_byte(byte [, crc]) --> rcrc <a href="#L-26"></a> <a href="#L-27"></a> Returns CRC-32 checksum `rcrc` of byte `byte` (number 0..255) appended to <a href="#L-28"></a> a string with CRC-32 checksum `crc`. `crc` defaults to 0 (empty string) <a href="#L-29"></a> if omitted. <a href="#L-30"></a> <a href="#L-31"></a> CRC.crc32_string(s, crc) --> bcrc <a href="#L-32"></a> <a href="#L-33"></a> Returns CRC-32 checksum `rcrc` of string `s` appended to <a href="#L-34"></a> a string with CRC-32 checksum `crc`. `crc` defaults to 0 (empty string) <a href="#L-35"></a> if omitted. <a href="#L-36"></a> <a href="#L-37"></a> CRC.crc32(o, crc) --> bcrc <a href="#L-38"></a> <a href="#L-39"></a> This invokes `crc32_byte` if `o` is a byte or `crc32_string` if `o` <a href="#L-40"></a> is a string. <a href="#L-41"></a> <a href="#L-42"></a> CRC.bit <a href="#L-43"></a> <a href="#L-44"></a> This contains the underlying bit library used by the module. It <a href="#L-45"></a> should be considered a read-only copy. <a href="#L-46"></a> <a href="#L-47"></a>DESIGN NOTES <a href="#L-48"></a> <a href="#L-49"></a> Currently, this module exposes the underlying bit array implementation in CRC <a href="#L-50"></a> checksums returned. In BitOp, bit arrays are 32-bit signed integer numbers <a href="#L-51"></a> (may be negative). In Lua 5.2 'bit32' and 'bit.numberlua', bit arrays are <a href="#L-52"></a> 32-bit unsigned integer numbers (non-negative). This is subject to change <a href="#L-53"></a> in the future but is currently done due to (unconfirmed) performance <a href="#L-54"></a> implications. <a href="#L-55"></a> <a href="#L-56"></a> On platforms with 64-bit numbers, one way to normalize CRC <a href="#L-57"></a> checksums to be unsigned is to do `crcvalue % 2^32`, <a href="#L-58"></a> <a href="#L-59"></a> The name of this module is inspired by Perl `Digest::CRC*`. <a href="#L-60"></a> <a href="#L-61"></a>DEPENDENCIES <a href="#L-62"></a> <a href="#L-63"></a> Requires one of the following bit libraries: <a href="#L-64"></a> <a href="#L-65"></a> BitOp "bit" -- bitop.luajit.org -- This is included in LuaJIT and also available <a href="#L-66"></a> for Lua 5.1/5.2. This provides the fastest performance in LuaJIT. <a href="#L-67"></a> Lua 5.2 "bit32" -- www.lua.org/manual/5.2 -- This is provided in Lua 5.2 <a href="#L-68"></a> and is preferred in 5.2 (unless "bit" also happens to be installed). <a href="#L-69"></a> "bit.numberlua" (>=000.003) -- https://github.com/davidm/lua-bit-numberlua <a href="#L-70"></a> This is slowest and used as a last resort. <a href="#L-71"></a> It is only a few times slower than "bit32" though. <a href="#L-72"></a> <a href="#L-73"></a>DOWNLOAD/INSTALLATION <a href="#L-74"></a> <a href="#L-75"></a> If using LuaRocks: <a href="#L-76"></a> luarocks install lua-digest-crc32lua <a href="#L-77"></a> <a href="#L-78"></a> Otherwise, download <https://github.com/davidm/lua-digest-crc32lua/zipball/master>. <a href="#L-79"></a> Alternately, if using git: <a href="#L-80"></a> git clone git://github.com/davidm/lua-digest-crc32lua.git <a href="#L-81"></a> cd lua-digest-crc32lua <a href="#L-82"></a> Optionally unpack: <a href="#L-83"></a> ./util.mk <a href="#L-84"></a> or unpack and install in LuaRocks: <a href="#L-85"></a> ./util.mk install <a href="#L-86"></a> <a href="#L-87"></a>REFERENCES <a href="#L-88"></a> <a href="#L-89"></a> [1] http://www.axlradius.com/freestuff/CRC32.java <a href="#L-90"></a> [2] http://www.gamedev.net/reference/articles/article1941.asp <a href="#L-91"></a> [3] http://java.sun.com/j2se/1.5.0/docs/api/java/util/zip/CRC32.html <a href="#L-92"></a> [4] http://www.dsource.org/projects/tango/docs/current/tango.io.digest.Crc32.html <a href="#L-93"></a> [5] http://pydoc.org/1.5.2/zlib.html#-crc32 <a href="#L-94"></a> [6] http://www.python.org/doc/2.5.2/lib/module-binascii.html <a href="#L-95"></a> <a href="#L-96"></a>LICENSE <a href="#L-97"></a> <a href="#L-98"></a> (c) 2008-2011 David Manura. Licensed under the same terms as Lua (MIT). <a href="#L-99"></a> <a href="#L-100"></a> Permission is hereby granted, free of charge, to any person obtaining a copy <a href="#L-101"></a> of this software and associated documentation files (the "Software"), to deal <a href="#L-102"></a> in the Software without restriction, including without limitation the rights <a href="#L-103"></a> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell <a href="#L-104"></a> copies of the Software, and to permit persons to whom the Software is <a href="#L-105"></a> furnished to do so, subject to the following conditions: <a href="#L-106"></a> <a href="#L-107"></a> The above copyright notice and this permission notice shall be included in <a href="#L-108"></a> all copies or substantial portions of the Software. <a href="#L-109"></a> <a href="#L-110"></a> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR <a href="#L-111"></a> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, <a href="#L-112"></a> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE <a href="#L-113"></a> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER <a href="#L-114"></a> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, <a href="#L-115"></a> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN <a href="#L-116"></a> THE SOFTWARE. <a href="#L-117"></a> (end license) <a href="#L-118"></a> <a href="#L-119"></a>--]] <a href="#L-120"></a> <a href="#L-121"></a> <a href="#L-122"></a>local M = {_TYPE='module', _NAME='digest.crc32', _VERSION='0.3.20111128'} <a href="#L-123"></a> <a href="#L-124"></a>local type = type <a href="#L-125"></a>local require = require <a href="#L-126"></a>local setmetatable = setmetatable <a href="#L-127"></a> <a href="#L-128"></a>--[[ <a href="#L-129"></a> Requires the first module listed that exists, else raises like `require`. <a href="#L-130"></a> If a non-string is encountered, it is returned. <a href="#L-131"></a> Second return value is module name loaded (or ''). <a href="#L-132"></a> --]] <a href="#L-133"></a>local function requireany(...) <a href="#L-134"></a> local errs = {} <a href="#L-135"></a> for _,name in ipairs{...} do <a href="#L-136"></a> if type(name) ~= 'string' then return name, '' end <a href="#L-137"></a> local ok, mod = pcall(require, name) <a href="#L-138"></a> if ok then return mod, name end <a href="#L-139"></a> errs[#errs+1] = mod <a href="#L-140"></a> end <a href="#L-141"></a> error(table.concat(errs, '\n'), 2) <a href="#L-142"></a>end <a href="#L-143"></a> <a href="#L-144"></a>local bit, name_ = requireany('bit32', 'bit', 'bit.numberlua') <a href="#L-145"></a>local bxor = bit.bxor <a href="#L-146"></a>local bnot = bit.bnot <a href="#L-147"></a>local band = bit.band <a href="#L-148"></a>local rshift = bit.rshift <a href="#L-149"></a> <a href="#L-150"></a>-- CRC-32-IEEE 802.3 (V.42) <a href="#L-151"></a>local POLY = 0xEDB88320 <a href="#L-152"></a> <a href="#L-153"></a>-- Memoize function pattern (like http://lua-users.org/wiki/FuncTables ). <a href="#L-154"></a>local function memoize(f) <a href="#L-155"></a> local mt = {} <a href="#L-156"></a> local t = setmetatable({}, mt) <a href="#L-157"></a> function mt:__index(k) <a href="#L-158"></a> local v = f(k); t[k] = v <a href="#L-159"></a> return v <a href="#L-160"></a> end <a href="#L-161"></a> return t <a href="#L-162"></a>end <a href="#L-163"></a> <a href="#L-164"></a>-- CRC table. <a href="#L-165"></a>local crc_table = memoize(function(i) <a href="#L-166"></a> local crc = i <a href="#L-167"></a> for _=1,8 do <a href="#L-168"></a> local b = band(crc, 1) <a href="#L-169"></a> crc = rshift(crc, 1) <a href="#L-170"></a> if b == 1 then crc = bxor(crc, POLY) end <a href="#L-171"></a> end <a href="#L-172"></a> return crc <a href="#L-173"></a>end) <a href="#L-174"></a> <a href="#L-175"></a> <a href="#L-176"></a>function M.crc32_byte(byte, crc) <a href="#L-177"></a> crc = bnot(crc or 0) <a href="#L-178"></a> local v1 = rshift(crc, 8) <a href="#L-179"></a> local v2 = crc_table[bxor(crc % 256, byte)] <a href="#L-180"></a> return bnot(bxor(v1, v2)) <a href="#L-181"></a>end <a href="#L-182"></a>local M_crc32_byte = M.crc32_byte <a href="#L-183"></a> <a href="#L-184"></a> <a href="#L-185"></a>function M.crc32_string(s, crc) <a href="#L-186"></a> crc = crc or 0 <a href="#L-187"></a> for i=1,#s do <a href="#L-188"></a> crc = M_crc32_byte(s:byte(i), crc) <a href="#L-189"></a> end <a href="#L-190"></a> return crc <a href="#L-191"></a>end <a href="#L-192"></a>local M_crc32_string = M.crc32_string <a href="#L-193"></a> <a href="#L-194"></a> <a href="#L-195"></a>function M.crc32(s, crc) <a href="#L-196"></a> if type(s) == 'string' then <a href="#L-197"></a> return M_crc32_string(s, crc) <a href="#L-198"></a> else <a href="#L-199"></a> return M_crc32_byte(s, crc) <a href="#L-200"></a> end <a href="#L-201"></a>end <a href="#L-202"></a> <a href="#L-203"></a> <a href="#L-204"></a>M.bit = bit -- bit library used <a href="#L-205"></a> <a href="#L-206"></a> <a href="#L-207"></a>return M </pre></div>   </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; 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