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https://github.com/FirebirdSQL/firebird.git
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70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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* PROGRAM: JRD Access Method
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* MODULE: sqz.h
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* DESCRIPTION: Data compression control block
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*
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* The contents of this file are subject to the Interbase Public
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* License Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy
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* of the License at http://www.Inprise.com/IPL.html
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*
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* Software distributed under the License is distributed on an
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* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
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* or 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 was created by Inprise Corporation
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* and its predecessors. Portions created by Inprise Corporation are
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* Copyright (C) Inprise Corporation.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#ifndef JRD_SQZ_H
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#define JRD_SQZ_H
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#include "../include/fb_blk.h"
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#include "../../common/classes/array.h"
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namespace Jrd
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{
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class Compressor : public Firebird::AutoStorage
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{
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public:
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Compressor(size_t length, const UCHAR* data);
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size_t getPackedLength() const
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{
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return m_length;
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}
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const UCHAR* getControl() const
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{
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return m_control.begin();
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}
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size_t getControlSize() const
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{
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return m_control.getCount();
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}
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void pack(const UCHAR*, UCHAR*) const;
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size_t pack(const UCHAR*, size_t, UCHAR*) const;
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size_t getPartialLength(size_t, const UCHAR*) const;
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static UCHAR* unpack(size_t, const UCHAR*, size_t, UCHAR*);
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static size_t applyDiff(size_t, const UCHAR*, size_t, UCHAR* const);
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static size_t makeDiff(size_t, const UCHAR*, size_t, UCHAR*, size_t, UCHAR*);
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static size_t makeNoDiff(size_t, UCHAR*);
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private:
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Firebird::HalfStaticArray<UCHAR, 2048> m_control;
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size_t m_length;
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};
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} //namespace Jrd
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#endif // JRD_SQZ_H
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