icu 编解码数据:
extern const UConverterSharedData
_MBCSData, _Latin1Data,
_UTF8Data, _UTF16BEData, _UTF16LEData, _UTF32BEData, _UTF32LEData,
_ISO2022Data,
_LMBCSData1,_LMBCSData2, _LMBCSData3, _LMBCSData4, _LMBCSData5, _LMBCSData6,
_LMBCSData8,_LMBCSData11,_LMBCSData16,_LMBCSData17,_LMBCSData18,_LMBCSData19,
_HZData,_ISCIIData, _SCSUData, _ASCIIData,
_UTF7Data, _Bocu1Data, _UTF16Data, _UTF32Data, _CESU8Data, _IMAPData, _CompoundTextData;
U_CDECL_END
Code point 代码点 Byte 1 Byte 2 Byte 3 Byte 4
U+ 0000 .. 007F 0xxxxxxx
U+ 0080 .. 07FF 110xxxxx 10xxxxxx
U+ 0800 .. FFFF 1110xxxx 10xxxxxx 10xxxxxx
U+ 10000 .. 10FFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
可变长度编码