从2进制文件读取一个UTF8字符串 ReadUTF8 ,跨平台

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如果缺少什么函数，请给下看。。

 

 1 string HSReadData::ReadUTF8()

 2 {

 3     

 4     int utflen = ReadShort() & 0xffff;

 5     wstring str;

 6     str.resize(utflen);

 7     vector<char> bytes;

 8     bytes.resize(utflen);

 9     for (int i=0;i<utflen;++i)

10     {

11         bytes[i] = this->ReadByte();

12     }

13 

14     int ch1, ch2, ch3;

15     int length = 0;

16     int index = 0;

17 

18     while(length < utflen)

19     {

20         ch1 = (int) bytes[length] & 0xff;

21         switch(ch1 >> 4)

22         {

23         case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:

24             /* 0xxxxxxx*/

25             length++;

26             str[index++] = (wchar_t)ch1;

27             break;

28         case 12: case 13:

29             /* 110x xxxx   10xx xxxx*/

30             length += 2;

31             if(length > utflen)

32             {

33                 return "Error code -1";

34             }

35 

36             ch2 = (int)bytes[length - 1];

37             if((ch2 & 0xC0) != 0x80)

38             {

39                 return "Error code -1";

40             }

41 

42             str[index++] = (wchar_t)(((ch1 & 0x1F) << 6) | (ch2 & 0x3F));

43             break;

44         case 14:

45             /* 1110 xxxx  10xx xxxx  10xx xxxx */

46             length += 3;

47             if(length > utflen)

48             {

49                 return "Error code -1";

50             }

51 

52             ch2 = (int)bytes[length - 2];

53             ch3 = (int)bytes[length - 1];

54 

55             if(((ch2 & 0xC0) != 0x80) || ((ch3 & 0xC0) != 0x80))

56             {

57                 return "Error code -1";

58             }

59             str[index++] = (wchar_t)(((ch1 & 0x0F) << 12) | ((ch2 & 0x3F) << 6) | ((ch3 & 0x3F) << 0));

60             break;

61         default:

62             /* 10xx xxxx,  1111 xxxx */

63             return "Error code -1";

64         }

65     }

66     string text = HSTool::GetStringWithWstring(str);

67     

68     return text;

69 }

 

 

 1 short  HSReadData::ReadShort()

 2 {

 3     int b1 = Fgetc();

 4     int b2 = Fgetc();

 5     b1 &= 0xff;

 6     b2 &= 0xff;

 7     if (b1 == -1 || b2 == -1)

 8     {

 9         HSMessageBox("HSReadData @ ReadShort  throw -1 ");

10     }

11     int value = (b1 << 8) | (b2 << 0);

12     return (short) value;

13 }

 

 

 1 char  HSReadData::ReadByte()

 2 {

 3     int b1 = Fgetc();

 4     b1 &= 0xff;

 5     if (b1 == -1)

 6     {

 7         HSMessageBox("SPX3 @ ReadByte  throw -1 ");

 8     }

 9     int value = b1 & 0xff;

10     //CCLog("ReadByte : %d",b1);

11     return (char) value;

12 }

 1 std::string HSTool::GetStringWithWstring( const wstring& ws )

 2 {

 3 //     string curLocale = setlocale(LC_ALL, NULL); // curLocale = "C";

 4 //     setlocale(LC_ALL, "chs"); 

 5 //     const wchar_t* _Source = ws.c_str();

 6 //     size_t _Dsize = 2 * ws.size() + 1;

 7 //     char *_Dest = new char[_Dsize];

 8 //     memset(_Dest,0,_Dsize);

 9 //     wcstombs(_Dest,_Source,_Dsize);

10 //     string result = _Dest;

11 //     delete []_Dest;

12 //     setlocale(LC_ALL, curLocale.c_str());

13     string ret;

14 

15     ret.resize(ws.size());

16 

17     for(size_t i = 0; i < ws.size(); ++i)

18     {

19         ret[i] = (string::value_type)ws[i];

20     }

21 

22     return ret;

23     return ret;

24 }

 

 1 wstring HSTool::GetWstringWithString( const std::string& s )

 2 {

 3 //     std::string curLocale = setlocale(LC_ALL, NULL); // curLocale = "C";

 4 //     setlocale(LC_ALL, "chs"); 

 5 //     const char* _Source = s.c_str();

 6 //     size_t _Dsize = s.size() + 1;

 7 //     wchar_t *_Dest = new wchar_t[_Dsize];

 8 //     wmemset(_Dest, 0, _Dsize);

 9 //     mbstowcs(_Dest,_Source,_Dsize);

10 //     std::wstring result = _Dest;

11 //     delete []_Dest;

12 //     setlocale(LC_ALL, curLocale.c_str());

13     wstring ret;

14 

15     ret.resize(s.size());

16 

17     for(size_t i = 0; i < s.size(); ++i)

18     {

19         ret[i] = (wstring::value_type)s[i];

20     }

21 

22     return ret;

23 }