C++ to C# Code Conversion Types -

i trying convert following c# not getting expected results.

c++ code:

dword ccskw::getcs(cstring strfile) {     try     {         cfile file(strfile, cfile::moderead);         word wtemp = 0;         word wcs = 0;          const uint uimaxcharread = 2000;         tchar c[uimaxcharread];         uint uicharread;          #ifdef _unicode             while(uicharread = file.read(c, uimaxcharread))             {                 for(uint i=0; < uicharread; i++)                     wcs ^= c[0];             }         #else             while(uicharread = file.read(c, uimaxcharread))             {                 for(uint i=0; < uicharread-1; i++)                 {                     wtemp = c[i];                     i++;                     wtemp <<= 8;                     wtemp   += c[i];                     wcs ^= wtemp;                 }             }         #endif         file.close();         return (dword)wcs;     }     catch(cfileexception *e)     {         e->reporterror();                    e->delete();                     }     return 0; } 

briefly code reads value binary file , returns it. value used checksum calculation method.

my c# code:

public uint32 getcs() {     try     {         ushort wtemp = 0;         ushort wcs = 0;         byte[] buffer = new byte[2000];          int count;         using (filestream fs = new filestream(csfile, filemode.open))         {             while ((count = fs.read(buffer, 0, buffer.length)) > 0)             {                 (int = 0; < count - 1; i++)                 {                     wtemp = buffer[i];                     i++;                     wtemp <<= 8;                     wtemp += buffer[i];                     wcs ^= wtemp;                 }             }         }         return convert.touint32(wcs);     }     catch (exception ex)     {         console.writeline(ex);     }     return 0; } 

i know might difficult without knowing code, know if on right track or if have made obvious errors.

thank you!

the issue here c++ code using tchar, signed 8-bit type, c# code using byte, unsigned 8-bit type.

that means line of code:

wtemp += buffer[i]; 

will increase value of wtemp in c# code because buffer[i] unsigned, in c++ code decrease value of wtemp values of buffer[i] >= 0x80.

you can fix changing offending line to:

unchecked { wtemp = (ushort)(wtemp + (sbyte)buffer[i]); } 

after doing that, sample file produce result of 0x3336, expected.