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#ifndef __DECODER_H__
#define __DECODER_H__
//
// This file is part of sffview, a program to view structured fax files (sff)
//
// Copyright (C) 1998-2008 Peter Schaefer-Hutter and contributors ("THE AUTHORS")
//
// Permission to use, copy, modify, distribute, and sell this software and
// its documentation for any purpose is hereby granted without fee.
//
// THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
// EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
// WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//
// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL,
// INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY
// DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
// WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY
// THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE
// OR PERFORMANCE OF THIS SOFTWARE.
//
// Contributor(s):
// None
//
// You can contact the original author by email at peter.schaefer@gmx.de.
//
// I'm always pleased to hear that somebody is actually using my software.
// If you can manage it, e-mail me a quick notice. Thanks!
//
/*-RCS-Info----------------------------------------------------
$Id: decoder.h,v 1.2 2008/03/21 13:47:01 pschaefer Exp $
---RCS-Info--------------------------------------------------*/
class CBitSource
{
private:
sff_byte *m_pBuffer;
sff_word m_wBitsAvail;
sff_dword m_dwAccu;
sff_dword m_dwByteCount;
public:
void NeedBits(int nCount);
void ClrBits(int nCount);
sff_word GetBits(int nCount);
bool NoMoreBits();
CBitSource(void *pBuffer, sff_dword nByteCount);
};
//-----------------------------------------------------------------
class IBitSink
{
public:
virtual void SetBits(int nCount) = 0;
virtual void ClearBits(int nCount) = 0;
};
//-----------------------------------------------------------------
class CBitSink : public IBitSink
{
protected:
sff_byte *m_pBuffer;
sff_dword m_dwBitPos;
sff_dword m_dwByteCount;
sff_dword m_dwBitCount;
public:
void Reset();
virtual void SetBits(int nCount);
virtual void ClearBits(int nCount);
CBitSink(void *pBuffer, sff_dword nByteCount);
};
//-----------------------------------------------------------------
// writes ones
class CByteSink : public CBitSink
{
public:
CByteSink(void *pBuffer, sff_dword nByteCount) :
CBitSink(pBuffer, nByteCount) { /* sonst nix */ };
void SetBits(int nCount);
};
//-----------------------------------------------------------------
class CHuffDecoder : public CBitSource
{
protected:
sff_dword m_dwRunlength;
public:
CHuffDecoder(sff_byte *pBuffer, sff_dword nByteCount) :
CBitSource(pBuffer, nByteCount) { /* sonst nix */ };
int FindToken(LPTABENTRY pTable);
int DecodeLine(IBitSink& aBitSink);
};
#endif // __DECODER_H__
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