50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1994.
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//
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// File: MAPPER.HXX
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//
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// Contents: Source Mapper
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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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#pragma once
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//+---------------------------------------------------------------------------
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//
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// Class: CSourceMapper
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//
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// Purpose: Maps Text Source position into Filter Region
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//
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// History: 23-Sep-94 BartoszM Created.
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//
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// Notes: If the chunk is derived property, it can either map directly
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// to the source chunk, in which case _ccLen is zero,
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// or the mapping is undefined, in which case the source position
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// is given by offset zero and length _ccLen.
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//
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//----------------------------------------------------------------------------
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class CSourceMapper
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{
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public:
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CSourceMapper () : _idChunk(0), _offSplit(0), _ccLen(0) {}
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void NewChunk ( ULONG idChunk, ULONG ccBegin );
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void NewDerivedChunk ( ULONG idChunkSrc, ULONG ccBeginSrc, ULONG ccLen );
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void Advance ( ULONG ccProcessed );
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void GetSrcRegion ( FILTERREGION& region, ULONG len, ULONG ccOffsetInBuffer );
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private:
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ULONG _idChunk;
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ULONG _offInChunk; // Beginning of buffer is at this offset in chunk
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ULONG _offSplit; // Buffer split between two chunks
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ULONG _idNewChunk; // the new chunk in split buffer
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ULONG _ccLen; // length of src chunk
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};
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