Furthermore, I don't believe UTF-8 is a legal encoding in a PDF stream. It is my understanding that you have to use a uniform byte size for characters. PDF has several means at its disposal to define an encoding, and none of them are capable of supporting characters with variable byte sizes.
How can you define an encoding in PDF:
1) A named encoding (PdfDocEncoding, WinAnsiEncoding, MacRomanEncoding, etc), all 1-byte
2) A named encoding plus a differences array (replace this code point with that character). 1-byte
3) A differences array without a named encoding (which IIRC defaults to PdfDocEncoding). 1-byte
4) A "CharMap". This is a postscript-esque file containing a mapping of code points to characters. 1, 2, or 4 byte characters. I believe a 3-byte char map would be legal, but I've never seen one.
There are many predefined charmaps for things like UTF-16, or Big 5. The predefined charmaps are all specific to a single language. There's one for utf-16 JP, one for CN, and so forth.
You need to use different charmaps for different writing directions. I'm not really sure why. So one example of a charmap name, "UniGB-UTF16-H", maps UTF characters to a Chinese language font written horizontally.
And then there's the "Identity" charmaps. These allow you to write glyph values into a stream for a particular font. Glyphs are in no particular order in any given font, and can vary from one release of that font to the next.
iText, IIRC, is smart enough to take a TrueType (or OpenType, I'd imagine) font and pull out all the glyph indexes it needs so you can ignore the language-specific limitations placed on the pre-released charmaps.
Thus endeth the lesson.
--Mark Storer
Senior Software Engineer
Cardiff.com
#include <disclaimer>
typedef std::Disclaimer<Cardiff> DisCard;
-----Original Message-----
Behalf Of Paulo
Soares
Sent: Tuesday, July 24, 2007 8:54 AM
To: Post all your questions about iText here
Subject: Re: [iText-questions] BaseFont with UTF-8?
UTF-8 is an Unicode stream representation that doesn't mean
anything after the text resides in a String. The constant
you're looking for is BaseFont.IDENTITY_H but note that
you'll need a TrueType font for this to work.
Paulo
-----Original Message-----
Behalf Of Lars Nagel (Trium)
Sent: Tuesday, July 24, 2007 4:49 PM
To: Post all your questions about iText here
Subject: [iText-questions] BaseFont with UTF-8?
Hi all,
Is it possible to set the encoding to UTF-8 / Unicode instead
of e. g.
BaseFont.CP1252. I want to pass UTF-8 to
BaseFont.createFont(...) as it
is done with BaseFont.CP1252 in the following example.
BaseFont baseFont = BaseFont.createFont(urlFont.getPath(),
BaseFont.CP1252, BaseFont.EMBEDDED);
As there is no constant available in class BaseFont, I
would like to
know the String I have to pass to the function.
Thanks in advance,
Lars
--
Lars Nagel
Trium Analysis Online GmbH
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Fon : +49 89 2060269 21
Fax : +49 89 2060269 11
Internet: www.trium.de
Amtsgericht Muenchen, HRB 134012
Dr. Martin Daumer, Michael Scholz
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--Mark Storer
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