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118 lines
2.6 KiB
C++
118 lines
2.6 KiB
C++
/*
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* PROGRAM: JRD Access Method
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* MODULE: Aligner.h
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* DESCRIPTION: Aligner, OutAligner - templates to help
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* with alignment on RISC machines.
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* Should be used ONLY as temporary on-stack buffers!
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*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Alexander Peshkoff
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2007 Alexander Peshkoff <peshkoff@mail.ru>
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* and all contributors signed below.
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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 CLASSES_ALIGN_H
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#define CLASSES_ALIGN_H
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#include "../common/classes/array.h"
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namespace Firebird {
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// Aligns output parameter (i.e. transfers data in destructor).
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template <typename C>
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class OutAligner
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{
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private:
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UCHAR* userBuffer;
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#ifdef RISC_ALIGNMENT
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Firebird::HalfStaticArray<C, BUFFER_SMALL> localBuffer;
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ULONG bSize;
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C* bPointer;
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#endif
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public:
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OutAligner(UCHAR* buf, ULONG len) : userBuffer(buf)
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#ifdef RISC_ALIGNMENT
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, bSize(len), bPointer(0)
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#endif
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{
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fb_assert(len % sizeof(C) == 0);
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#ifdef RISC_ALIGNMENT
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if ((IPTR) userBuffer & (sizeof(C) - 1))
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{
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bPointer = localBuffer.getBuffer(len / sizeof(C) + (bSize % sizeof(C) ? 1 : 0));
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}
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#endif
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}
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operator C*()
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{
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#ifdef RISC_ALIGNMENT
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return bPointer ? bPointer : reinterpret_cast<C*>(userBuffer);
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#else
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return reinterpret_cast<C*>(userBuffer);
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#endif
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}
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~OutAligner()
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{
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#ifdef RISC_ALIGNMENT
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if (bPointer)
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{
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memcpy(userBuffer, bPointer, bSize);
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}
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#endif
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}
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};
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// Aligns input parameter.
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template <typename C>
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class Aligner
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{
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private:
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#ifdef RISC_ALIGNMENT
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Firebird::HalfStaticArray<C, BUFFER_SMALL> localBuffer;
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#endif
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const C* bPointer;
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public:
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Aligner(const UCHAR* buf, ULONG len)
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{
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fb_assert(len % sizeof(C) == 0);
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#ifdef RISC_ALIGNMENT
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if ((IPTR) buf & (sizeof(C) - 1))
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{
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C* tempPointer = localBuffer.getBuffer(len / sizeof(C) + (len % sizeof(C) ? 1 : 0));
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memcpy(tempPointer, buf, len);
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bPointer = tempPointer;
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}
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else
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#endif
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bPointer = reinterpret_cast<const C*>(buf);
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}
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operator const C*()
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{
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return bPointer;
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}
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};
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} // namespace Firebird
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#endif // CLASSES_ALIGN_H
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