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91 lines
2.4 KiB
91 lines
2.4 KiB
/*
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Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
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Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 2.1 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __STREAM_WINDOWOUT_H
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#define __STREAM_WINDOWOUT_H
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#include "iiostrm.h"
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namespace NStream {
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namespace NWindow {
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// m_KeepSizeBefore: how mach BYTEs must be in buffer before m_Pos;
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// m_KeepSizeAfter: how mach BYTEs must be in buffer after m_Pos;
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// m_KeepSizeReserv: how mach BYTEs must be in buffer for Moving Reserv;
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// must be >= aKeepSizeAfter; // test it
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class COut
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{
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BYTE *m_Buffer;
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UINT32 m_Pos;
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UINT32 m_PosLimit;
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UINT32 m_KeepSizeBefore;
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UINT32 m_KeepSizeAfter;
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UINT32 m_KeepSizeReserv;
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UINT32 m_StreamPos;
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UINT32 m_WindowSize;
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UINT32 m_MoveFrom;
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ISequentialOutStream *m_Stream;
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virtual void MoveBlockBackward();
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public:
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COut(): m_Buffer(0), m_Stream(0) {}
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virtual ~COut();
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void Create(UINT32 aKeepSizeBefore,
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UINT32 aKeepSizeAfter, UINT32 aKeepSizeReserv = (1<<17));
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void SetWindowSize(UINT32 aWindowSize);
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void Init(ISequentialOutStream *aStream, bool aSolid = false);
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HRESULT Flush();
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UINT32 GetCurPos() const { return m_Pos; }
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const BYTE *GetPointerToCurrentPos() const { return m_Buffer + m_Pos;};
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void CopyBackBlock(UINT32 aDistance, UINT32 aLen)
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{
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if (m_Pos >= m_PosLimit)
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MoveBlockBackward();
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BYTE *p = m_Buffer + m_Pos;
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aDistance++;
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BYTE *p2 = p - aDistance;
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for(UINT32 i = 0; i < aLen; i++)
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p[i] = p2[i];
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m_Pos += aLen;
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}
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void PutOneByte(BYTE aByte)
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{
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if (m_Pos >= m_PosLimit)
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MoveBlockBackward();
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m_Buffer[m_Pos++] = aByte;
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}
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BYTE GetOneByte(UINT32 anIndex) const
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{
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return m_Buffer[m_Pos + anIndex];
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}
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BYTE *GetBuffer() const { return m_Buffer; }
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};
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}}
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#endif
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