Convert ASCII (Byte[] Array) to Binary

oornelas_Ca · August 21st, 2009, 12:33 AM

How can I convert XML data in ASCII format, to a single element containing Base-64 data.

In other words, how can I convert a list of ASCII elements like the following:

<Document>
<data>208</data>
<data>207</data>
<data>17</data>
<data>224</data>
<data>161</data>
<data>177</data>
<data>26</data>
<data>225</data>
<data>0</data>
.
.
etc....
<Document>

To its base64 representation, something like this:

<Document>
/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHB wgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL
</Document>

(the ASCII XML elements represent a small section of a word document)

Thanks

mhkay · August 21st, 2009, 03:50 AM

First point: ASCII stops at 127. When you say ASCII, I assume you mean Unicode or perhaps iso-8859-1?

Base64 is an encoding of a byte stream. So I assume you want these codes treated as single bytes. In that case, it's actually immaterial whether they are ASCII codes or iso-8859-1 codes or anything else - they are just bytes.

There's no direct way of doing this in pure XSLT 1.0 or 2.0. Saxon however has an extension function that you could use:

http://www.saxonica.com/documentatio...e64binary.html

Calling

Code:

<xsl:value-of select="saxon:octets-to-base64Binary(/Document/data/xs:integer(.))"/>

should do the trick.