Implementation of the CRC32/CRC16 algorithm in C #

CRC32 algorithm

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Text;4 usingSystem.IO;5 6 namespaceGetCRC327 {8     classCrc32cls9     {Ten         protected ULONG[] crc32table; One         //Generate CRC32 Code table A          Public voidgetcrc32table () -         { -             ULONGCRC; theCrc32table =New ULONG[ the]; -             inti,j; -              for(i =0; I < the; i++)  -             { +CRC = (ULONG) I; -                  for(j =8; J >0; j--) +                 { A                     if(CRC &1) ==1) atCRC = (CRC >>1) ^0xedb88320; -                     Else -CRC >>=1; -                 } -Crc32table[i] =CRC; -             } in         } -  to         //gets the CRC32 checksum value of the string +          Public ULONGGETCRC32STR (stringsinputstring) -         { the             //Generate Code Table * getcrc32table (); $             byte[] buffer =System.Text.ASCIIEncoding.ASCII.GetBytes (sinputstring);Panax Notoginseng             ULONGValue =0xFFFFFFFF; -             intLen =buffer. Length; the              for(inti =0; i < Len; i++) +             { AValue = (Value >>8) ^ crc32table[(value &0xFF)^Buffer[i]]; the             } +             returnValue ^0xFFFFFFFF;  -         } $     } $}

CRC16 algorithm

1           Public Static byte[] CRC16 (stringsinputstring)2          {3              byte[] data =System.Text.ASCIIEncoding.ASCII.GetBytes (sinputstring);4              intLen =data. Length;5              if(Len >0)6              {7                  ushortCRC =0xFFFF;8 9                   for(inti =0; i < Len; i++)Ten                  { OneCRC = (ushort) (CRC ^(Data[i])); A                       for(intj =0; J <8; J + +) -                      { -CRC = (CRC &1) !=0? (ushort) (CRC >>1) ^0xa001) : (ushort) (CRC >>1); the                      } -                  } -                  byteHi = (byte) (CRC &0xff00) >>8);//High Position -                  byteLo = (byte) (CRC &0x00FF);//Low Position +  -                  return New byte[] {hi, lo}; +              } A              return New byte[] {0,0 }; at          } -  - //ASCII code to string -           Public Static stringBytetostring (byte[] arr,BOOLisreverse) -          { -              Try in              { -                  bytehi = arr[0], lo = arr[1]; to                  returnConvert.ToString (isreverse Hi + lo *0x100: Hi *0x100+ Lo, -). ToUpper (). PadLeft (4,'0'); +              } -              Catch(Exception ex) {Throw(ex);} the}

Implementation of the CRC32/CRC16 algorithm in C #