Character conversion considerations for EUC Traditional Chinese code page 964

Due to the standards definition for Traditional Chinese, there is a side effect that you might encounter when you convert some characters between double-byte or EUC code pages and UCS-2. There are 189 characters (consisting of 187 radicals and 2 numbers) that share the same UCS-2 code point, when converted, as another character in the code set. When these characters are converted back to double-byte or EUC, they are converted to the code point of the same character's ideograph, with which it shares the same UCS-2 code point, rather then back to the original code point. When displayed, the character appears the same, but has a different code point. Depending on your application's design, you might have to take this behavior into account.

As an example, consider what happens to code point X'A7A1' in EUC code page 964 when it is converted to UCS-2, then converted back to the original code page, EUC 964:

Thus, the original code points X'A7A1' and X'C4A1' end up as code point X'C4A1' after conversion.