/usr/include/ebml/EbmlCrc32.h is in libebml-dev 1.3.0-2+deb8u1.
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** libebml : parse EBML files, see http://embl.sourceforge.net/
**
** <file/class description>
**
** Copyright (C) 2002-2010 Steve Lhomme. All rights reserved.
**
** This file is part of libebml.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**
** See http://www.matroska.org/license/lgpl/ for LGPL licensing information.
**
** Contact license@matroska.org if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
/*!
\file
\version \$Id$
\author Steve Lhomme <robux4 @ users.sf.net>
\author Jory Stone <jcsston @ toughguy.net>
*/
#ifndef LIBEBML_CRC32_H
#define LIBEBML_CRC32_H
#include <cassert>
#include "EbmlTypes.h"
#include "EbmlBinary.h"
START_LIBEBML_NAMESPACE
DECLARE_EBML_BINARY(EbmlCrc32)
public:
EbmlCrc32(const EbmlCrc32 & ElementToClone);
virtual bool ValidateSize() const {return IsFiniteSize() && (GetSize() == 4);}
filepos_t RenderData(IOCallback & output, bool bForceRender, bool bWithDefault = false);
filepos_t ReadData(IOCallback & input, ScopeMode ReadFully = SCOPE_ALL_DATA);
// filepos_t UpdateSize(bool bWithDefault = false);
bool IsDefaultValue() const {
return false;
}
void AddElementCRC32(EbmlElement &ElementToCRC);
bool CheckElementCRC32(EbmlElement &ElementToCRC);
/*!
Use this to quickly check a CRC32 with some data
\return True if inputCRC matches CRC32 generated from input data
*/
static bool CheckCRC(uint32 inputCRC, const binary *input, uint32 length);
/*!
Calls Update() and Finalize(), use to create a CRC32 in one go
*/
void FillCRC32(const binary *input, uint32 length);
/*!
Add data to the CRC table, in other words process some data bit by bit
*/
void Update(const binary *input, uint32 length);
/*!
Use this with Update() to Finalize() or Complete the CRC32
*/
void Finalize();
/*!
Returns a uint32 that has the value of the CRC32
*/
uint32 GetCrc32() const {
return m_crc_final;
};
void ForceCrc32(uint32 NewValue) { m_crc_final = NewValue; SetValueIsSet();}
#if defined(EBML_STRICT_API)
private:
#else
protected:
#endif
void ResetCRC();
void UpdateByte(binary b);
static const uint32 m_tab[256];
uint32 m_crc;
uint32 m_crc_final;
EBML_CONCRETE_CLASS(EbmlCrc32)
};
template <class T>
inline unsigned int GetAlignment(T */* dummy */=NULL) // VC60 workaround
{
#if defined(_MSC_VER) && (_MSC_VER >= 1300)
return __alignof(T);
#elif defined(__GNUC__)
return __alignof__(T);
#else
return sizeof(T);
#endif
}
template <class T>
inline bool IsPowerOf2(T n)
{
return n > 0 && (n & (n-1)) == 0;
}
template <class T1, class T2>
inline T2 ModPowerOf2(T1 a, T2 b)
{
assert(IsPowerOf2(b));
return T2(a) & (b-1);
}
inline bool IsAlignedOn(const void *p, unsigned int alignment)
{
return IsPowerOf2(alignment) ? ModPowerOf2((uintptr_t)p, alignment) == 0 : (uintptr_t)p % alignment == 0;
}
template <class T>
inline bool IsAligned(const void *p, T */* dummy */=NULL) // VC60 workaround
{
return IsAlignedOn(p, GetAlignment<T>());
}
END_LIBEBML_NAMESPACE
#endif // LIBEBML_CRC32_H
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