[Mono-bugs] [Bug 480178] System.Globalization.CharUnicodeInfo.GetUnicodeCategory() does not handle surrogate characters appropriately.

[bugzilla_noreply at novell.com]

http://bugzilla.novell.com/show_bug.cgi?id=480178

http://bugzilla.novell.com/show_bug.cgi?id=480178#c29


Damien Diederen <dd at crosstwine.com> changed:

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 Attachment #359239|0                           |1
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--- Comment #29 from Damien Diederen <dd at crosstwine.com> 2010-05-14 20:54:56 UTC ---
Created an attachment (id=362382)
 --> (http://bugzilla.novell.com/attachment.cgi?id=362382)
create-category-table: Utility to generate reasonably-packed Unicode tables

This program generates bi-level category tables encoding the contents
of multiple variants of the Unicode category database.

Mono embeds a linear table with category codes for the Unicode BMP
(first 65536 codepoints), and lacks information about characters in
the astral planes--leading to requests such as bug 480178.  Extending
the linear table to cover the full codespace is not an ideal solution
as that would expand the embedded "blob" by a factor of 17.

The new tables generated by this program can be used to support the
full 0000-10FFFF range of characters.  Despite covering a much larger
codespace, the "page" sharing mechanism enabled by the additional
level of indirection allows the data size to shrink from 64 to ~30kB
for .NET 2.0-compatible tables, and ~48kB for combined 2.0+4.0 tables.

Cf. in-file comments for usage instructions.

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