RE: [xml] UTF8Toisolat1() usage

["Christopher R. Maden" <crism maden org>]

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At 01:06 5/6/02, Morus Walter wrote:
> A conversion from UTF8 to Latin1 may only shorten the text (down to
> the half of the utf8 byte length in extreme cases).
> So allocating a buffer of the size of the UTF8 text will be sufficiant.

No - the Latin 1 string may be between 0.5 and 1 times as many bytes as the 
UTF-8 string.  For U+0000-U+007F, the UTF-8 and Latin 1 characters will 
both be one byte; for U+0080-U+00FF, the UTF-8 string will be two bytes to 
the Latin 1 string's one byte.  It would be wise to allocate a buffer just 
as long as the UTF-8 string, since any language that uses Latin 1 tends to 
use primarily the characters in the ASCII range.

> If you convert Latin1 to UTF8 the text might need up to twice the space.

That's true, though only if the string contains only accented characters 
and less-common punctuation (which is difficult for a meaningful string of 
any size in any European language).

~Chris
- -- 
Christopher R. Maden, Principal Consultant, crism consulting
DTDs/schemas - conversion - ebooks - publishing - Web - B2B - training
<URL: http://crism.maden.org/consulting/ >
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