107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1992.
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//
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// File: MAPPER.CXX
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//
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// Contents: Search Key Repository
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//
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// Classes: CSourceMapper
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//
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// History: 23-Sep-94 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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#include <pch.cxx>
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#pragma hdrstop
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#include <mapper.hxx>
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//+---------------------------------------------------------------------------
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//
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// Member: CSourceMapper::Advance
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//
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// Synopsis: Advance the mapper after processing ccDelta characters
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//
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// History: 30-Sep-94 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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void CSourceMapper::Advance ( ULONG ccProcessed )
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{
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_offInChunk += ccProcessed;
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if (_offSplit != 0)
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{
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// split buffer situation (two current chunks)
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if (ccProcessed >= _offSplit)
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{
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// got rid of leftover chunk
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_offInChunk = ccProcessed - _offSplit;
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_offSplit = 0;
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_idChunk = _idNewChunk;
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}
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else
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_offSplit -= ccProcessed;
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}
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}
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void CSourceMapper::NewChunk ( ULONG idChunk, ULONG ccBegin )
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{
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if (ccBegin != 0)
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{
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_offSplit = ccBegin;
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_idNewChunk = idChunk;
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}
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else
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{
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_offSplit = 0;
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_idChunk = idChunk;
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_offInChunk = 0;
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}
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_ccLen = 0;
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}
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void CSourceMapper::NewDerivedChunk ( ULONG idChunkSource, ULONG ccBeginSource, ULONG ccLen )
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{
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_idChunk = idChunkSource;
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_offInChunk = ccBeginSource;
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_offSplit = 0;
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_ccLen = ccLen;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CSourceMapper::GetSrcRegion
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//
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// Synopsis: Returns source filter region for current position
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//
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// History: 23-Sep-94 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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void CSourceMapper::GetSrcRegion ( FILTERREGION& region, ULONG len, ULONG ccOffsetInBuf )
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{
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if (_offSplit == 0 || ccOffsetInBuf < _offSplit)
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{
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region.idChunk = _idChunk;
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if (_ccLen == 0) // direct mapping
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{
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region.cwcStart = _offInChunk + ccOffsetInBuf;
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region.cwcExtent = len;
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}
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else // map to whole region
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{
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region.cwcStart = _offInChunk;
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region.cwcExtent = _ccLen;
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}
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}
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else
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{
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region.idChunk = _idNewChunk;
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region.cwcStart = ccOffsetInBuf - _offSplit;
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region.cwcExtent = len;
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}
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}
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