XrdCksCalccrc32.hh

Go to the documentation of this file.

#ifndef __XRDCKSCALCCRC32_HH__
#define __XRDCKSCALCCRC32_HH__
/******************************************************************************/
/*                                                                            */
/*                    X r d C k s C a l c c r c 3 2 . h h                     */
/*                                                                            */
/* (c) 2011 by the Board of Trustees of the Leland Stanford, Jr., University  */
/*                            All Rights Reserved                             */
/*   Produced by Andrew Hanushevsky for Stanford University under contract    */
/*              DE-AC02-76-SFO0515 with the Department of Energy              */
/******************************************************************************/

#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <inttypes.h>

#include "XrdCks/XrdCksCalc.hh"
#include "XrdSys/XrdSysPlatform.hh"
  
class XrdCksCalccrc32 : public XrdCksCalc
{
public:

char *Final() {char buff[sizeof(long long)];
               long long tLcs = TotLen;
               int i = 0;
               if (tLcs)
                  {while(tLcs) {buff[i++] = tLcs & 0xff ; tLcs >>= 8;}
                   Update(buff, i);
                  }
               TheResult = C32Result ^ CRC32_XOROT;
#ifndef Xrd_Big_Endian
               TheResult = htonl(TheResult);
#endif
               return (char *)&TheResult;
              }

void        Init() {C32Result = CRC32_XINIT; TotLen = 0;}

XrdCksCalc *New() {return (XrdCksCalc *)new XrdCksCalccrc32;}

void        Update(const char *Buff, int BLen);

const char *Type(int &csSz) {csSz = sizeof(TheResult); return "crc32";}

            XrdCksCalccrc32() {Init();}
virtual    ~XrdCksCalccrc32() {}

private:
static const unsigned int CRC32_XINIT = 0;
static const unsigned int CRC32_XOROT = 0xffffffff;
static       unsigned int crctable[256];
             unsigned int C32Result;
             unsigned int TheResult;
             long long    TotLen;
};
#endif