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101 lines
3.2 KiB
C++
Executable File
101 lines
3.2 KiB
C++
Executable File
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla strings.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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*
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*/
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#ifndef nsSharedBufferList_h___
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#define nsSharedBufferList_h___
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#include "nsBufferHandle.h"
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// for |nsSharedBufferHandle|
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#include "nscore.h"
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// for |PRUnichar|
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/**
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* This class forms the basis for several multi-fragment string classes, in
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* particular: |nsFragmentedString| (though not yet), and |nsSlidingString|/|nsSlidingSubstring|.
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*
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* This class is not templated. It is provided only for |PRUnichar|-based strings.
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* If we turn out to have a need for multi-fragment ASCII strings, then perhaps we'll templatize
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* or else duplicate this class.
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*/
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class nsSharedBufferList
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{
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public:
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class Buffer
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: public nsXXXBufferHandle<PRUnichar>
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{
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public:
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Buffer( PRUnichar* aDataStart, PRUnichar* aDataEnd, PRUnichar* aStorageStart, PRUnichar* aStorageEnd ) : nsXXXBufferHandle<PRUnichar>(aDataStart, aDataEnd, aStorageStart, aStorageEnd) { }
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Buffer* mPrev;
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Buffer* mNext;
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};
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struct Position
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{
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Buffer* mBuffer;
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PRUnichar* mPosInBuffer;
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};
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public:
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nsSharedBufferList() : mFirstBuffer(0), mLastBuffer(0), mTotalDataLength(0) { }
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virtual ~nsSharedBufferList();
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private:
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// pass by value is not supported
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nsSharedBufferList( const nsSharedBufferList& ); // NOT TO BE IMPLEMENTED
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void operator=( const nsSharedBufferList& ); // NOT TO BE IMPLEMENTED
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public:
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void LinkBuffer( Buffer*, Buffer*, Buffer* );
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Buffer* UnlinkBuffer( Buffer* );
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void SplitBuffer( const Position& );
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static Buffer* NewBuffer( const PRUnichar*, PRUint32, PRUint32 = 0 );
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void DiscardSuffix( PRUint32 );
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// need other discards: prefix, and by iterator or pointer or something
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Buffer* GetFirstBuffer() { return mFirstBuffer; }
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const Buffer* GetFirstBuffer() const { return mFirstBuffer; }
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Buffer* GetLastBuffer() { return mLastBuffer; }
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const Buffer* GetLastBuffer() const { return mLastBuffer; }
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ptrdiff_t GetDataLength() const { return mTotalDataLength; }
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protected:
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void DestroyBuffers();
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protected:
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Buffer* mFirstBuffer;
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Buffer* mLastBuffer;
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ptrdiff_t mTotalDataLength;
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};
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#endif // !defined(nsSharedBufferList_h___)
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