/usr/include/dcmtk/ofstd/ofcrc32.h is in libdcmtk-dev 3.6.2-3build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright (C) 2002-2011, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: ofstd
*
* Author: Marco Eichelberg
*
* Purpose: general purpose 32-bit CRC in C++
* Code is based on the CRC32 implementation (C)1986 Gary S. Brown
*
*/
#ifndef OFCRC32_H
#define OFCRC32_H
#include "dcmtk/ofstd/ofdefine.h"
/** general-purpose 32-bit CRC algorithm.
*/
class DCMTK_OFSTD_EXPORT OFCRC32
{
public:
/// constructor
OFCRC32()
: value(0)
{
}
/// destructor
~OFCRC32()
{
}
/// reset object to initial state (zero CRC)
void reset()
{
value=0;
}
/** add block of raw data to CRC
* @param ptr pointer to raw data
* @param size length of raw data block in bytes
*/
void addBlock(const void *ptr, unsigned long size);
/// returns the current CRC as unsigned int
unsigned int getCRC32() const
{
return value;
}
/** compute CRC for given block of data using a temporary CRC object
* @param ptr pointer to raw data
* @param size length of raw data block in bytes
* @return CRC32 as unsigned int
*/
static unsigned int compute(const void *ptr, unsigned long size);
private:
/// CRC look-up table
static const unsigned int crctab[256];
/// current CRC
unsigned int value;
};
#endif
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