Subject: Re: [xsl] decoding hex string to ascii or UTF-8 From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx> Date: Tue, 01 Jul 2008 10:34:59 -0400 |
I'm currently trying to work out the best way to convert a string of hex into the characters represented by each hex byte.
Which isn't what your subject line says ... your subject line is talking about an encoding which is different than your opening sentence which is talking about abstract characters. I'm answering the sentence, not the subject line.
I'm using xslt 2.0. So far I've come up with a function that simply does a lookup to from the hex value to the ascii character that hex value represents (see below).
Can anyone suggest a better way? Is there a way (without using a huge lookup to achieve a similar sort of thing for UTF-8 chars?
Mechanically calculating the hexadecimal code point and translating it is labourious but straightforward. Below is an example, but I cannot compare it to yours since I cannot see the way you've approached it.
t:\ftemp>type hex2ascii.xsl <?xml version="1.0" encoding="US-ASCII"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:k="urn:x-Ken" exclude-result-prefixes="xsd k" version="2.0">
<xsl:variable name="hexdigits" select="('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F') "/>
<xsl:template match="/"> <xsl:value-of select="k:hex2ascii('004400E9006A00E0')"/> </xsl:template>
<xsl:function name="k:hex2ascii" as="xsd:string?"> <xsl:param name="hex" as="xsd:string"/> <xsl:variable name="codepoints" as="xsd:integer*"> <xsl:for-each select="1 to ( string-length($hex) idiv 4 )"> <xsl:sequence select= "(index-of($hexdigits,substring($hex,(. - 1) * 4 + 1,1)) - 1 ) * 4096 + (index-of($hexdigits,substring($hex,(. - 1) * 4 + 2,1)) - 1 ) * 256 + (index-of($hexdigits,substring($hex,(. - 1) * 4 + 3,1)) - 1 ) * 16 + (index-of($hexdigits,substring($hex,(. - 1) * 4 + 4,1)) - 1 )"/> </xsl:for-each> </xsl:variable> <xsl:sequence select="codepoints-to-string($codepoints)"/> </xsl:function>
</xsl:stylesheet> t:\ftemp>xslt2 hex2ascii.xsl hex2ascii.xsl hex2ascii.txt
t:\ftemp>cat hex2ascii.txt Dij` t:\ftemp>
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