Hi,
when generating PDF files with a bfrange entry in the ToUnicode
parameter, it is not possible to copy text from a PDF file when it is
opened in Acrobat Reader. Selecting the text is possible, but the actual
copy action causes Acrobat Reader to show an error message, that an
error has occured.
I first thought the problem to be related to this Ghostscript bug:
http://bugs.ghostscript.com/show_bug.cgi?format=multiple&id=691272
(Acrobat reader does not work if the low and high indexes have leading
zeros), but patching PDFToUnicodeCMap to create two-digit entries for
indexes < 256 even for multibyte fonts did not work either. Acrobat
Reader did not fail completely when copying the text, but characters
within the ranges were not copied correctly. Pasting the copied text
into a text editor caused the non-range characters to come out properly,
but the characters within the declared ranges come out as garbage.
Reading through the specification for the ToUnicode parameter, it is not
obvious to me what FOP is doing wrong here (the Ghostscript bug mentions
a bug in Acrobat Reader), but as long as the probably most used PDF
reader is buggy here, wouldn't it be reasonable not to use the range
feature? After patching the partOfRange method to always return false
solved all problems and text seems to be copy & pasteable without
restrictions. The drawback is of course that the generated attribute may
be slightly larger.
Regards,
Tor
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