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POXSLT: Convert base64 data into image files
 

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    <p>I have seen several questions on how to encode an image file in base64, but how about the other way around - how do I reconstitute a picture from a base64 string stored in an XML file?</p> <pre><code>&lt;resource&gt; &lt;data encoding="base64"&gt; R0lGODlhEAAQAPMAMcDAwP/crv/erbigfVdLOyslHQAAAAECAwECAwECAwECAwECAwECAwECAwEC AwECAyH/C01TT0ZGSUNFOS4wGAAAAAxtc09QTVNPRkZJQ0U5LjAHgfNAGQAh/wtNU09GRklDRTku MBUAAAAJcEhZcwAACxMAAAsTAQCanBgAIf8LTVNPRkZJQ0U5LjATAAAAB3RJTUUH1AkWBTYSQXe8 fQAh+QQBAAAAACwAAAAAEAAQAAADSQhgpv7OlDGYstCIMqsZAXYJJEdRQRWRrHk2I9t28CLfX63d ZEXovJ7htwr6dIQB7/hgJGXMzFApOBYgl6n1il0Mv5xuhBEGJAAAOw== &lt;/data&gt; &lt;mime&gt;image/gif&lt;/mime&gt; &lt;resource-attributes&gt; &lt;file-name&gt;clip_image001.gif&lt;/file-name&gt; &lt;/resource-attributes&gt; &lt;/resource&gt; </code></pre> <p>Given the above XML node <code>resource</code>, how do I go about creating <code>clip_image001.gif</code>?</p> <p>Please suggest:</p> <ol> <li>XSLT processors and/or extensions enable this, plus</li> <li>a sample XSLT that triggers the conversion</li> </ol> <p>Note that it must be able to handle at least GIF &amp; PNG file formats. Preferably not restricted to any OS.</p> <hr /> <h1>Implemented solution</h1> <p>Based around <a href="https://stackoverflow.com/users/14419/mads-hansen">Mads Hansen's</a> solution. Main difference being that I referenced <code>net.sf.saxon.value.Base64BinaryValue</code> directly in my namespace rather than using the <code>saxon</code> namespace, because I understood the Java APIs more intuitively than the Saxonica website's descriptions of the <code>base64Binary-to-octets</code> and <code>base64Binary</code> functions.</p> <pre><code>&lt;xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:b64="net.sf.saxon.value.Base64BinaryValue" xmlns:fos="java.io.FileOutputStream" ... exclude-result-prefixes="b64 fos"&gt; ... &lt;xsl:for-each select="resource"&gt; &lt;xsl:variable name="b64" select="b64:new(string(data))"/&gt; ... &lt;xsl:variable name="fos" select="fos:new(string($img))"/&gt; &lt;xsl:value-of select="fos:write($fos, b64:getBinaryValue($b64))"/&gt; &lt;xsl:value-of select="fos:close($fos)"/&gt; &lt;/xsl:for-each&gt; ... </code></pre> <p>P.S. See <a href="https://stackoverflow.com/questions/1684963/xslt-obtaining-or-matching-hashes-for-base64-encoded-data">sibling question</a> for my implementation of how to obtain the hashes necessary to identify the image files.</p> <p><hr /> This question is a subquestion of <a href="https://stackoverflow.com/questions/1642104/evernote-export-format-enex-to-html-including-pictures">another question I have asked previously</a>.</p>
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