diff -r 000000000000 -r 7f656887cf89 commands/fed/inc/bufferbase.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/commands/fed/inc/bufferbase.h	Wed Jun 23 15:52:26 2010 +0100
@@ -0,0 +1,132 @@
+// bufferbase.h
+// 
+// Copyright (c) 2009 - 2010 Accenture. All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+// 
+// Initial Contributors:
+// Accenture - Initial contribution
+//
+
+#ifndef BUFFERBASE_H_
+#define BUFFERBASE_H_
+
+#include <e32base.h>
+
+#include "common.h"
+
+enum TEncodingType
+	{
+	EEncodingUnknown,
+	EEncodingNarrow,
+	EEncodingUtf8,
+	EEncodingUtf16LE,
+	EEncodingUtf16BE,
+#ifdef __BIG_ENDIAN__ // I know Symbian doesn't actually define the endian macros (afaics) but if they do, we'll do the right thing(TM)
+	EEncodingUtf16Native = EEncodingUtf16BE,
+	EEncodingUtf16Switched = EEncodingUtf16LE,
+#else
+	// Assume little-endian unless specifically told otherwise
+	EEncodingUtf16Native = EEncodingUtf16LE,
+	EEncodingUtf16Switched = EEncodingUtf16BE,
+#endif
+	};
+
+enum TDelimiterType
+	{
+	EDelimNotYetKnown = 0,
+	EDelimLF, // Unix
+	EDelimCRLF, // DOS
+	EDelimCR, // old school mac
+	EDelimUnicode, // KUnicodeLineBreak - really doubt we'll see many of these!
+	};
+
+class CFileBlock;
+
+//Parent class for all memory buffers which can be used by appropriate views to read/write data and show it on the screen
+class CFedBufferBase : public CActive, public MSharedCacheProvider
+{
+protected:
+	CFedBufferBase();
+
+public:
+	TInt RefCount() const;
+	void PushL(); // Pushes a cleanup stack item that does a DecRef()
+	void IncRef();
+	TInt DecRef();
+	~CFedBufferBase();
+
+public: // From MSharedCacheProvider
+	TInt RegisterClient(MSharedCacheClient& aClient, TPtrC& aDes, TRange& aRange, TInt& aRangeStartLineNumber);
+	void UnregisterClient(MSharedCacheClient& aClient);
+
+public: // CActive (noops in this class, override if you actually use the CActive-ness
+	void DoCancel();
+	void RunL();
+
+public:
+	virtual const TDesC& Title() const = 0;
+	virtual TBool Modified() const;
+	virtual TBool Editable() const;
+	virtual TDelimiterType DelimiterType() const = 0;
+	virtual TEncodingType Encoding() const = 0;
+	virtual TBool IsOpen() const;
+
+	virtual TInt GetData(MSharedCacheClient& aClient, TInt aDocumentPosition) = 0; // "Get me the block containing aDocumentPosition".
+	virtual TInt SeekFromOffset(MSharedCacheClient& aClient, TInt aOffset, TInt aNumLinesFromOffset, TInt aLineLength) = 0; 
+	virtual TBool DocumentPositionIsEof(TInt aDocumentPosition) const = 0; // The block containing aDocumentPosition MUST have already have been loaded (otherwise we could not guarantee const-ness)
+	virtual TInt Find(TInt aStartingPosition, const TDesC& aSearchString, TBool aBackwards) = 0;
+
+	virtual void InsertTextL(TInt aDocumentPosition, const TDesC& aText);
+	virtual void DeleteTextL(TRange aRange);
+	virtual void SaveL(const TDesC& aName, TBool aReplace);
+
+protected:
+	TInt FindClientRequest(MSharedCacheClient& aClient);
+
+	class TClientRequest
+		{
+	public:
+		TClientRequest(MSharedCacheClient* aClient, TPtrC& aDes, TRange& aRange, TInt& aRangeStartLineNumber)
+			: iClient(aClient), iDes(aDes), iRange(aRange), iLastRequestedBlock(NULL), iRangeStartLineNumber(aRangeStartLineNumber)
+			{}
+	public:
+		MSharedCacheClient* iClient;
+		TPtrC& iDes;
+		TRange& iRange; // iRange is the document range for whatever's in iDes (used for something else during seeking)
+		CFileBlock* iLastRequestedBlock;
+		TInt& iRangeStartLineNumber;
+		};
+
+private:
+	TInt iRefCount;
+protected:
+	RArray<TClientRequest> iClientRequests;
+
+};
+
+class CConstDataBuffer : public CFedBufferBase
+	{
+public:
+	CConstDataBuffer(const TDesC& aTitle, const TDesC& aText);
+	CConstDataBuffer(const TDesC& aTitle, HBufC* aTextPtr);
+	~CConstDataBuffer();
+
+	const TDesC& Title() const;
+	TDelimiterType DelimiterType() const;
+	TEncodingType Encoding() const;
+
+	TInt GetData(MSharedCacheClient& aClient, TInt aDocumentPosition);
+	TInt SeekFromOffset(MSharedCacheClient& aClient, TInt aOffset, TInt aNumLinesFromOffset, TInt aLineLength); 
+	TBool DocumentPositionIsEof(TInt aDocumentPosition) const;
+	TInt Find(TInt aStartingPosition, const TDesC& aSearchString, TBool aBackwards);
+
+private:
+	const TDesC& iTitle;
+	TPtrC iText;
+	HBufC* iOwnedTextPtr;
+	};
+
+#endif /*BUFFERBASE_H_*/