crypto/weakcryptospi/source/common/inlines.h
author Mikko Sunikka <mikko.sunikka@nokia.com>
Fri, 06 Nov 2009 13:21:00 +0200
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/*
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* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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/**
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 @file 
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 @internalTechnology
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*/
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#ifndef __INLINES_H__
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#define __INLINES_H__
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#include <e32base.h>
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#define assert(x) __ASSERT_DEBUG((x), User::Panic(_L("crypto.dll"), 1))
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#if defined(__GCC32__)
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typedef long long Int64;
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typedef unsigned long long Uint64;
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#elif defined(__VC32__)
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typedef __int64 Int64;
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typedef unsigned __int64 Uint64;
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#elif defined(__CW32__)
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#pragma longlong on
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typedef long long Int64;
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typedef unsigned long long Uint64;
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#endif
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typedef Uint64 dword;
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typedef TUint word;
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typedef TUint32 word32;
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const TUint WORD_SIZE = sizeof(TUint); 
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const TUint WORD_BYTES = WORD_SIZE;
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const TUint BYTE_BITS = 8;
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const TUint WORD_BITS = WORD_SIZE*BYTE_BITS;
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//These next two versions of GETBYTE compile to LDR's of words and then shifts
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//and ands to get it down to a byte.
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//#define GETBYTE(x, y) (TUint)(((x)>>(8*(y)))&255)
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//#define GETBYTE(x, y) (TUint)TUint8((x)>>(8*(y)))
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//This next version gets the best assembler on gcc and armv4 (it uses LDRB
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//rather than shifts and ands
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#define GETBYTE(x, y) (((TUint8 *)&(x))[y])
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#define MAKE_DWORD(lowWord, highWord) ((dword(highWord)<<WORD_BITS) | (lowWord))
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#define LOW_WORD(x) (TUint32)(x)
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#define HIGH_WORD(x) (TUint32)((x)>>WORD_BITS)
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template <class T> inline void TClassSwap(T& a, T& b)
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	{
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	T temp(a);
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	a = b;
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	b = temp;
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	}
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// Returns log2 of aNum where aNum is a power
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// of two	
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inline TUint8 CryptoLog2(TUint8 aNum)
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	{
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	switch (aNum)
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		{		
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		case 1:
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			return 0;
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		case 1 << 1:
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			return 1;
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		case 1 << 2:
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			return 2;
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		case 1 << 3:
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			return 3;
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		case 1 << 4:
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			return 4;
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		case 1 << 5:
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			return 5;
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		case 1 << 6:
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			return 6;
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		case 1 << 7:
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			return 7;
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		default:
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			ASSERT(EFalse);
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		}
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	return 0;
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	}
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inline TUint BitsToBytes(TUint bitCount)
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	{
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	return ((bitCount+7)/(BYTE_BITS));
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	}
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inline TUint BytesToWords(TUint byteCount)
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	{
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	return ((byteCount+WORD_SIZE-1)/WORD_SIZE);
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	}
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inline TUint BitsToWords(TUint bitCount)
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	{
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	return ((bitCount+WORD_BITS-1)/(WORD_BITS));
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	}
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inline TUint WordsToBits(TUint wordCount)
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	{
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	return wordCount * WORD_BITS;
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	}
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inline TUint BytesToBits(TUint byteCount)
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	{	
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	return byteCount * BYTE_BITS;
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	}
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inline TUint WordsToBytes(TUint wordCount)
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	{
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	return wordCount * WORD_BYTES;
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	}
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inline void XorWords(TUint32* r, const TUint32* a, TUint n)
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	{
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	assert(((TUint32)r & 3) == 0); // Catch alignment problems
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	for (TUint i=0; i<n; i++)
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		r[i] ^= a[i];
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	}
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inline void XorBuf(TUint8* buf, const TUint8* mask, TUint count)
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	{
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	if (((TUint)buf | (TUint)mask | count) % WORD_SIZE == 0) 
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		{
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		XorWords((TUint32*)buf, (const TUint32*)mask, count/WORD_SIZE); 
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		}
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	else
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		{
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		for (TUint i=0; i<count; i++)
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			buf[i] ^= mask[i];
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		}
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	}
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// ************** rotate functions ***************
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template <class T> inline T rotlFixed(T x, TUint y)
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	{
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	assert(y < sizeof(T)*8);
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	return ( (T)((x<<y) | (x>>(sizeof(T)*8-y))) );
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	}
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template <class T> inline T rotrFixed(T x, TUint y)
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	{
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	assert(y < sizeof(T)*8);
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	return ((T)((x>>y) | (x<<(sizeof(T)*8-y))));
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	}
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inline TUint32 byteReverse(TUint32 value)
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	{
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	value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
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	return rotlFixed(value, 16U);
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	}
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template <class T>
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void byteReverse(T* out, const T* in, TUint32 byteCount)
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	{
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	TUint count = (byteCount+sizeof(T)-1)/sizeof(T);
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	for (TUint i=0; i<count; i++)
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		out[i] = byteReverse(in[i]);
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	}
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template <class T>
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inline void GetUserKeyLittleEndian(T *out, TUint32 outlen, const TUint8* in, TUint32 inlen)
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	{
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	const TUint U = sizeof(T);
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	assert(inlen <= outlen*U);
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	Mem::Copy(out, in, inlen);
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	Mem::FillZ((TUint8*)out+inlen, outlen*U-inlen);
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	}
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template <class T>
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inline void GetUserKeyBigEndian(T *out, TUint32 outlen, const TUint8* in, TUint32 inlen)
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	{
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	const TUint U = sizeof(T);
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	assert(inlen <= outlen*U);
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	Mem::Copy(out, in, inlen);
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	Mem::FillZ((TUint8*)out+inlen, outlen*U-inlen);
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	byteReverse(out, out, inlen);
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	}
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// The following methods have be changed to use byte rather than word accesses,
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// as if the input pointer is not be word aligned a fault occurs on arm
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// hardware.  This isn't optimal from a performance point of view, but it is
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// neccessary because the crypto interfaces (CSymmetricCipher,
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// CBlockTransformation) allow clients to pass non-aligned data.
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// Fetch 4 words from user's buffer into "a", "b", "c", "d" in LITTLE-endian order
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inline void GetBlockLittleEndian(const TUint8* block, TUint16 &a, TUint16 &b, TUint16 &c, TUint16 &d)
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	{
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	a = (TUint16)(block[0] | block[1] << 8);
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	b = (TUint16)(block[2] | block[3] << 8);
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	c = (TUint16)(block[4] | block[5] << 8);
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	d = (TUint16)(block[6] | block[7] << 8);
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	}
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// Put 4 words back into user's buffer in LITTLE-endian order
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inline void PutBlockLittleEndian(TUint8* block, TUint16 a, TUint16 b, TUint16 c, TUint16 d)
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	{
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	block[0] = (TUint8)(a & 0xff);
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	block[1] = (TUint8)(a >> 8);
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	block[2] = (TUint8)(b & 0xff);
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	block[3] = (TUint8)(b >> 8);
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	block[4] = (TUint8)(c & 0xff);
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	block[5] = (TUint8)(c >> 8);
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	block[6] = (TUint8)(d & 0xff);
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	block[7] = (TUint8)(d >> 8);
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	}
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// Fetch 1 word from user's buffer in BIG-endian order
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inline void GetWordBigEndian(const TUint8* block, TUint32 &a)
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	{
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	a = block[0] << 24 | block[1] << 16 | block[2] << 8 | block[3];
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	}
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// Put 1 word back into user's buffer in BIG-endian order
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inline void PutWordBigEndian(TUint8* block, TUint32 a)
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	{
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	block[0] = (TUint8)(a >> 24);
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	block[1] = (TUint8)((a >> 16) & 0xff);
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	block[2] = (TUint8)((a >> 8) & 0xff);
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	block[3] = (TUint8)(a & 0xff);
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	}
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// Fetch 2 words from user's buffer into "a", "b" in BIG-endian order
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inline void GetBlockBigEndian(const TUint8* block, TUint32 &a, TUint32& b)
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	{
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	GetWordBigEndian(block, a);
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	GetWordBigEndian(block + 4, b);
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	}
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// Put 2 words back into user's buffer in BIG-endian order
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inline void PutBlockBigEndian(TUint8* block, TUint32 a, TUint32 b)
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	{
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	PutWordBigEndian(block, a);
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	PutWordBigEndian(block + 4, b);
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	}
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// Fetch 4 words from user's buffer into "a", "b", "c", "d" in BIG-endian order
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inline void GetBlockBigEndian(const TUint8* block, TUint32& a, TUint32& b, TUint32& c, TUint32& d)
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	{
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	GetWordBigEndian(block, a);
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	GetWordBigEndian(block + 4, b);
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	GetWordBigEndian(block + 8, c);
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	GetWordBigEndian(block + 12, d);
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	}
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// Put 4 words back into user's buffer in BIG-endian order
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inline void PutBlockBigEndian(TUint8* block, TUint32 a, TUint32 b, TUint32 c, TUint32 d)
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	{
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	PutWordBigEndian(block, a);
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	PutWordBigEndian(block + 4, b);
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	PutWordBigEndian(block + 8, c);
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	PutWordBigEndian(block + 12, d);
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	}
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Mikko Sunikka <mikko.sunikka@nokia.com>
parents:
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#endif // __INLINES_H__