跨平台Unicode与UTF8互转代码

在原来原基础上,将代码整理,并加强安全性. 并按照WindowsAPI设计, 添加输出缓冲长度探测功能

当OutUTFString为NULL时, 可以进行输出的UTF8字符串长度探测

   1: uint32 UniCharToUTF8(wchar_t UniChar, char *OutUTFString)
   2:      {
   3:
   4:          uint32 UTF8CharLength = 0;
   5:
   6:          if (UniChar < 0x80)
   7:          {
   8:              if ( OutUTFString )
   9:                  OutUTFString[UTF8CharLength++] = (char)UniChar;
10:              else
11:                  UTF8CharLength++;
12:          }
13:          else if(UniChar < 0x800)
14:          {
15:              if ( OutUTFString )
16:              {
17:                  OutUTFString[UTF8CharLength++] = 0xc0 | ( UniChar >> 6 );
18:                  OutUTFString[UTF8CharLength++] = 0x80 | ( UniChar & 0x3f );
19:              }
20:              else
21:              {
22:                  UTF8CharLength += 2;
23:              }
24:          }
25:          else if(UniChar < 0x10000 )
26:          {
27:              if ( OutUTFString )
28:              {
29:                  OutUTFString[UTF8CharLength++] = 0xe0 | ( UniChar >> 12 );
30:                  OutUTFString[UTF8CharLength++] = 0x80 | ( (UniChar >> 6) & 0x3f );
31:                  OutUTFString[UTF8CharLength++] = 0x80 | ( UniChar & 0x3f );
32:              }
33:              else
34:              {
35:                  UTF8CharLength += 3;
36:              }
37:          }
38:          else if( UniChar < 0x200000 )
39:          {
40:              if ( OutUTFString )
41:              {
42:                  OutUTFString[UTF8CharLength++] = 0xf0 | ( (int)UniChar >> 18 );
43:                  OutUTFString[UTF8CharLength++] = 0x80 | ( (UniChar >> 12) & 0x3f );
44:                  OutUTFString[UTF8CharLength++] = 0x80 | ( (UniChar >> 6) & 0x3f );
45:                  OutUTFString[UTF8CharLength++] = 0x80 | ( UniChar & 0x3f );
46:              }
47:              else
48:              {
49:                  UTF8CharLength += 4;
50:              }
51:
52:          }
53:
54:          return UTF8CharLength;
55:      }

当OutUnicodeString为NULL时, 可以进行输出的Unicode字符串长度探测

   1: uint32 UTF8StrToUnicode( const char* UTF8String, uint32 UTF8StringLength, wchar_t* OutUnicodeString, uint32 UnicodeStringBufferSize )
   2:      {
   3:          uint32 UTF8Index = 0;
   4:          uint32 UniIndex = 0;
   5:
   6:          while ( UTF8Index < UTF8StringLength )
   7:          {
   8:              unsigned char UTF8Char = UTF8String[UTF8Index];
   9:
10:              if ( UnicodeStringBufferSize != 0 && UniIndex >= UnicodeStringBufferSize )
11:                  break;
12:
13:              if ((UTF8Char & 0x80) == 0)
14:              {
15:                  const uint32 cUTF8CharRequire = 1;
16:
17:                  // UTF8字码不足
18:          &nb

补充：软件开发 , C++ ,