106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
#ifndef __DECODER_H__
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#define __DECODER_H__
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//
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// Headerfile for decoder classes
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//
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// This file is part of sfftobmp, a program to convert
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// structured fax files (sff) to windows bitmap files (bmp),
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// portable bitmap graphics (pbm), tagged image file format (tiff)
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// or JPEG (jpg).
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//
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// Copyright (C) 1998-2012 Peter Schaefer-Hutter and contributors ("THE AUTHORS")
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//
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// Permission to use, copy, modify, distribute, and sell this software and
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// its documentation for any purpose is hereby granted without fee.
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//
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// THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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// WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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//
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// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL,
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// INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY
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// DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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// WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY
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// THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE
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// OR PERFORMANCE OF THIS SOFTWARE.
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//
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// Contributor(s):
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// None
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//
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// You can contact the original author by email at peter.schaefer@gmx.de.
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//
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// I'm always pleased to hear that somebody is actually using my software.
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// If you can manage it, e-mail me a quick notice. Thanks!
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//
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/*-RCS-Info----------------------------------------------------
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$Id$
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---RCS-Info--------------------------------------------------*/
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class CBitSource
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{
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private:
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sff_byte *m_pBuffer;
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sff_word m_wBitsAvail;
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sff_dword m_dwAccu;
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sff_dword m_dwByteCount;
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public:
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void NeedBits(int nCount);
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void ClrBits(int nCount);
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sff_word GetBits(int nCount);
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bool NoMoreBits();
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CBitSource(void *pBuffer, sff_dword nByteCount);
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};
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//-----------------------------------------------------------------
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class CBitSink
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{
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protected:
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sff_byte *m_pBuffer;
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sff_dword m_dwBitPos;
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sff_dword m_dwByteCount;
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sff_dword m_dwBitCount;
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public:
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void Reset();
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virtual void SetBits(int nCount);
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virtual void ClearBits(int nCount);
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CBitSink(void *pBuffer, sff_dword nByteCount);
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};
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//-----------------------------------------------------------------
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class CByteSink : public CBitSink
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{
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public:
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CByteSink(void *pBuffer, sff_dword nByteCount) :
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CBitSink(pBuffer, nByteCount) { /* nth. else */ };
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void SetBits(int nCount);
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};
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//-----------------------------------------------------------------
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class CHuffDecoder : public CBitSource
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{
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protected:
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sff_dword m_dwRunlength;
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public:
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CHuffDecoder(sff_byte *pBuffer, sff_dword nByteCount) :
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CBitSource(pBuffer, nByteCount),
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m_dwRunlength(0) { /* nth. else */ };
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int FindToken(LPTABENTRY pTable);
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int DecodeLine(CBitSink& aBitSink);
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};
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#endif // __DECODER_H__
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