XrdCksCalccrc32 Class Reference

#include <XrdCksCalccrc32.hh>

Inheritance diagram for XrdCksCalccrc32:

Collaboration diagram for XrdCksCalccrc32:

Public Member Functions
	XrdCksCalccrc32 ()
virtual	~XrdCksCalccrc32 ()
char *	Final ()
void	Init ()
XrdCksCalc *	New ()
const char *	Type (int &csSz)
void	Update (const char *Buff, int BLen)
Public Member Functions inherited from XrdCksCalc
	XrdCksCalc ()
	Constructor.
virtual	~XrdCksCalc ()
	Destructor.
virtual char *	Calc (const char *Buff, int BLen)
virtual char *	Current ()
virtual void	Recycle ()
	Recycle the checksum object as it is no longer needed. A default is given.

Detailed Description

Definition at line 41 of file XrdCksCalccrc32.hh.

Constructor & Destructor Documentation

XrdCksCalccrc32()

XrdCksCalccrc32::XrdCksCalccrc32 ( )

inline

Definition at line 67 of file XrdCksCalccrc32.hh.

{Init();}

References Init().

Referenced by New().

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~XrdCksCalccrc32()

virtual XrdCksCalccrc32::~XrdCksCalccrc32 ( )

inlinevirtual

Definition at line 68 of file XrdCksCalccrc32.hh.

{}

Member Function Documentation

Final()

char * XrdCksCalccrc32::Final ( )

inlinevirtual

Get the actual checksum in binary format.

Returns

the checksum value in binary format. The pointer to the value becomes invalid once the associated object is deleted.

Implements XrdCksCalc.

Definition at line 45 of file XrdCksCalccrc32.hh.

              {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;
              }

References Update().

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Init()

void XrdCksCalccrc32::Init ( )

inlinevirtual

Initializes data structures (must be called by constructor). This is always called to reuse the object for a new checksum.

Implements XrdCksCalc.

Definition at line 59 of file XrdCksCalccrc32.hh.

{C32Result = CRC32_XINIT; TotLen = 0;}

Referenced by XrdCksCalccrc32().

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New()

XrdCksCalc * XrdCksCalccrc32::New ( )

inlinevirtual

Get a new instance of the underlying checksum calculation object.

Returns

the checksum calculation object.

Implements XrdCksCalc.

Definition at line 61 of file XrdCksCalccrc32.hh.

{return (XrdCksCalc *)new XrdCksCalccrc32;}

References XrdCksCalc::XrdCksCalc(), and XrdCksCalccrc32().

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Type()

const char * XrdCksCalccrc32::Type ( int & csSize )

inlinevirtual

Get the checksum object algorithm name and the number bytes (i.e. size) required for the checksum value.

Parameters

csSize

-> Parameter to hold the size of the checksum value.

Returns

the checksum algorithm's name. The name persists event after the checksum object is deleted.

Implements XrdCksCalc.

Definition at line 65 of file XrdCksCalccrc32.hh.

{csSz = sizeof(TheResult); return "crc32";}

Update()

void XrdCksCalccrc32::Update ( const char * Buff, int BLen )

virtual

Compute a running checksum. This method may be called repeatedly for data segments; with Final() returning the full checksum.

Parameters

Buff	-> Data to be checksummed.
BLen	-> Length of the data in Buff.

Implements XrdCksCalc.

Definition at line 169 of file XrdCksCalccrc32.cc.

{
 
// Process each byte
//
   TotLen += reclen;
   while(reclen-- > 0)
        C32Result = (C32Result<<8) 
                  ^ crctable[(unsigned char)((C32Result>>24)^*p++)];
}

Referenced by Final().

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The documentation for this class was generated from the following files:

• XrdCksCalccrc32.hh
• XrdCksCalccrc32.cc