參考來源:http://blog.csdn.net/flying8127/article/details/1598521
在原來原基礎(chǔ)上,將代碼整理,并加強安全性. 并按照WindowsAPI設(shè)計, 添加輸出緩沖長度探測功能
當(dāng)OutUTFString為NULL時, 可以進(jìn)行輸出的UTF8字符串長度探測
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: }
當(dāng)OutUnicodeString為NULL時, 可以進(jìn)行輸出的Unicode字符串長度探測
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字碼不足
18: if ( UTF8Index + cUTF8CharRequire > UTF8StringLength )
19: break;
20:
21: if ( OutUnicodeString )
22: { 23: wchar_t& WideChar = OutUnicodeString[UniIndex];
24:
25: WideChar = UTF8Char;
26: }
27:
28: UTF8Index++;
29:
30: }
31: else if((UTF8Char & 0xE0) == 0xC0) ///< 110x-xxxx 10xx-xxxx
32: { 33: const uint32 cUTF8CharRequire = 2;
34:
35: // UTF8字碼不足
36: if ( UTF8Index + cUTF8CharRequire > UTF8StringLength )
37: break;
38:
39: if ( OutUnicodeString )
40: { 41: wchar_t& WideChar = OutUnicodeString[UniIndex];
42: WideChar = (UTF8String[UTF8Index + 0] & 0x3F) << 6;
43: WideChar |= (UTF8String[UTF8Index + 1] & 0x3F);
44: }
45:
46: UTF8Index += cUTF8CharRequire;
47: }
48: else if((UTF8Char & 0xF0) == 0xE0) ///< 1110-xxxx 10xx-xxxx 10xx-xxxx
49: { 50: const uint32 cUTF8CharRequire = 3;
51:
52: // UTF8字碼不足
53: if ( UTF8Index + cUTF8CharRequire > UTF8StringLength )
54: break;
55:
56: if ( OutUnicodeString )
57: { 58: wchar_t& WideChar = OutUnicodeString[UniIndex];
59:
60: WideChar = (UTF8String[UTF8Index + 0] & 0x1F) << 12;
61: WideChar |= (UTF8String[UTF8Index + 1] & 0x3F) << 6;
62: WideChar |= (UTF8String[UTF8Index + 2] & 0x3F);
63: }
64:
65:
66: UTF8Index += cUTF8CharRequire;
67: }
68: else if((UTF8Char & 0xF8) == 0xF0) ///< 1111-0xxx 10xx-xxxx 10xx-xxxx 10xx-xxxx
69: { 70: const uint32 cUTF8CharRequire = 4;
71:
72: // UTF8字碼不足
73: if ( UTF8Index + cUTF8CharRequire > UTF8StringLength )
74: break;
75:
76: if ( OutUnicodeString )
77: { 78: wchar_t& WideChar = OutUnicodeString[UniIndex];
79:
80: WideChar = (UTF8String[UTF8Index + 0] & 0x0F) << 18;
81: WideChar = (UTF8String[UTF8Index + 1] & 0x3F) << 12;
82: WideChar |= (UTF8String[UTF8Index + 2] & 0x3F) << 6;
83: WideChar |= (UTF8String[UTF8Index + 3] & 0x3F);
84: }
85:
86: UTF8Index += cUTF8CharRequire;
87: }
88: else ///< 1111-10xx 10xx-xxxx 10xx-xxxx 10xx-xxxx 10xx-xxxx
89: { 90: const uint32 cUTF8CharRequire = 5;
91:
92: // UTF8字碼不足
93: if ( UTF8Index + cUTF8CharRequire > UTF8StringLength )
94: break;
95:
96: if ( OutUnicodeString )
97: { 98: wchar_t& WideChar = OutUnicodeString[UniIndex];
99:
100: WideChar = (UTF8String[UTF8Index + 0] & 0x07) << 24;
101: WideChar = (UTF8String[UTF8Index + 1] & 0x3F) << 18;
102: WideChar = (UTF8String[UTF8Index + 2] & 0x3F) << 12;
103: WideChar |= (UTF8String[UTF8Index + 3] & 0x3F) << 6;
104: WideChar |= (UTF8String[UTF8Index + 4] & 0x3F);
105: }
106:
107: UTF8Index += cUTF8CharRequire;
108: }
109:
110:
111: UniIndex++;
112: }
113:
114: return UniIndex;
115: }
療效: 用了此代碼啊, 再也不用被iconv折磨了