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Re: [off-topic] xtext -- encoding declarations for text

• To: "Richard Tobin" <richard@c...>,<xml-dev@l...>
• Subject: Re: [off-topic] xtext -- encoding declarations for text
• From: "Bob Foster" <bob@o...>
• Date: Tue, 20 May 2003 17:19:46 -0500
• References: <200305201021.LAA26885@s...>

From: "Richard Tobin" <richard@c...>
> > * else look for EBCDIC/ASCII signature (use string
"[^a-zA-Z01-9]{1-4}xtext\b"
> >    rather than "<?xml\b"
>
> For XML, it's only necessary to look at the first four bytes to cover
> Unicode encodings, ascii supersets and ebcdic.  In the xtext case, you
> will have to compare a string at several different positions or apply
> a regular expression.  Certainly doable, but certainly more complex too!

1. Based on the zero patterns in the first four octets, fill a 10-octet
array with candidate characters. (This may require reading up to 40 octets.)
2. Scan zero-based array locations 3 through 6 inclusive for 'e' in both
ASCII and EBCDIC. If neither is found, not an xtext. If EBCDIC is found, and
first four octets contained a zero byte, not an xtext. Otherwise, using the
appropriate charset verify the 'e' appears in the correct context.

Bob

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  • Re: [off-topic] xtext -- encoding declarations for text
    • From: Richard Tobin <richard@c...>

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