Migrating Software to Supplementary Characters
Vladimir Weinstein & Mark Davis- IBM Corporation
Until recently, it was not necessary for software to deal with supplementary code points, those from U+10000 to U+10FFFF. With the assignment of over 40,000 supplementary characters in Unicode 3.1 and the definition of new national codepage standards that map to these new characters, it is important to modify BMP-only software to handle the full range of Unicode code points.
Typically, only a small percentage of code needs to be changed. This affects mostly low-level handling of 16-bit code units and data structures containing per-character data.This presentation discusses the changes required to handle all of Unicode vs. just the BMP subset, concentrating on 16-bit Unicode -- the most common processing form. It describes techniques for finding the small percentage of code that typically needs to be changed, and shows how to modify such code. Detailed examples for Java and C/C++ use the many helper functions from ICU to illustrate practical solutions.
|When the world wants to talk, it speaks Unicode|
International Unicode Conferences are organized by Global Meeting Services, Inc., (GMS).
GMS is pleased to be able to offer the International Unicode Conferences under an exclusive
license granted by the Unicode Consortium. All responsibility for conference finances and
operations is borne by GMS. The independent conference board serves solely at the pleasure
of GMS and is composed of volunteers active in Unicode and in international software
development. All inquiries regarding International Unicode Conferences should be addressed
Unicode and the Unicode logo are registered trademarks of Unicode, Inc. Used with permission.
5 July 2002, Webmaster