Added templates to ensure alignment in INTL

src/common/classes/Aligner.h

@@ -0,0 +1,115 @@
+/*
+ *	PROGRAM:	JRD Access Method
+ *	MODULE:		Aligner.h
+ *	DESCRIPTION:	Aligner, OutAligner - templates to help 
+ *					with alignment on RISC machines. 
+ *					Should be used ONLY as temporary on-stack buffers!
+ *
+ *  The contents of this file are subject to the Initial
+ *  Developer's Public License Version 1.0 (the "License");
+ *  you may not use this file except in compliance with the
+ *  License. You may obtain a copy of the License at
+ *  http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
+ *
+ *  Software distributed under the License is distributed AS IS,
+ *  WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing rights
+ *  and limitations under the License.
+ *
+ *  The Original Code was created by Alexander Peshkoff
+ *  for the Firebird Open Source RDBMS project.
+ *
+ *  Copyright (c) 2007 Alexander Peshkoff <peshkoff@mail.ru>
+ *  and all contributors signed below.
+ *
+ *  All Rights Reserved.
+ *  Contributor(s): ______________________________________.
+ */
+
+#ifndef CLASSES_ALIGN_H
+#define CLASSES_ALIGN_H
+
+#include "../common/classes/array.h"
+
+namespace Firebird {
+
+// Aligns output parameter (i.e. transfers data in destructor).
+template <typename C>
+class OutAligner {
+private:
+	UCHAR* userBuffer;
+#ifdef RISC_ALIGNMENT
+	Firebird::HalfStaticArray<C, BUFFER_SMALL> localBuffer;
+	ULONG bSize;
+	C* bPointer;
+#endif
+
+public:
+	OutAligner(UCHAR* buf, ULONG len) : userBuffer(buf)
+#ifdef RISC_ALIGNMENT
+		, bSize(len), bPointer(0)
+#endif	
+	{
+		fb_assert(len % sizeof(C) == 0);
+#ifdef RISC_ALIGNMENT
+		if ((IPTR)userBuffer & (sizeof(C) - 1))
+		{
+			bPointer = localBuffer.getBuffer(len / sizeof(C) + (bSize % sizeof(C) ? 1 : 0));
+		}
+#endif
+	}
+
+	operator C*() 
+	{
+		return 
+#ifdef RISC_ALIGNMENT
+			   bPointer ? bPointer :
+#endif
+									 reinterpret_cast<C*>(userBuffer);
+	} 
+
+	~OutAligner() 
+	{
+#ifdef RISC_ALIGNMENT
+		if (bPointer)
+		{
+			memcpy(userBuffer, bPointer, bSize);
+		}
+#endif
+	}
+};
+
+// Aligns input parameter.
+template <typename C>
+class Aligner {
+private:
+#ifdef RISC_ALIGNMENT
+	Firebird::HalfStaticArray<C, BUFFER_SMALL> localBuffer;
+#endif
+	const C* bPointer;
+
+public:
+	Aligner(const UCHAR* buf, ULONG len)
+	{
+		fb_assert(len % sizeof(C) == 0);
+#ifdef RISC_ALIGNMENT
+		if ((IPTR)buf & (sizeof(C) - 1))
+		{
+			C* tempPointer = localBuffer.getBuffer(len / sizeof(C) + (len % sizeof(C) ? 1 : 0));
+			memcpy(tempPointer, buf, len);
+			bPointer = tempPointer;
+		}
+		else
+#endif
+			bPointer = reinterpret_cast<const C*>(buf);
+	}
+
+	operator const C*() 
+	{
+		return bPointer;
+	} 
+};
+
+} //namespace Firebird
+
+#endif // CLASSES_ALIGN_H