endian.c

来自「使用visual studio 2005 开发的开源文件、磁盘加密软件。这是6.」· C语言 代码 · 共 58 行

/*
 Legal Notice: Some portions of the source code contained in this file were
 derived from the source code of Encryption for the Masses 2.02a, which is
 Copyright (c) 1998-2000 Paul Le Roux and which is governed by the 'License
 Agreement for Encryption for the Masses'. Modifications and additions to
 the original source code (contained in this file) and all other portions of
 this file are Copyright (c) 2003-2008 TrueCrypt Foundation and are governed
 by the TrueCrypt License 2.6 the full text of which is contained in the
 file License.txt included in TrueCrypt binary and source code distribution
 packages. */

#include "Tcdefs.h"
#include "Common/Endian.h"


unsigned __int16 MirrorBytes16 (unsigned __int16 x)
{
	return (x << 8) | (x >> 8);
}


unsigned __int32 MirrorBytes32 (unsigned __int32 x)
{
	unsigned __int32 n = (unsigned __int8) x;
	n <<= 8; n |= (unsigned __int8) (x >> 8);
	n <<= 8; n |= (unsigned __int8) (x >> 16);
	return (n << 8) | (unsigned __int8) (x >> 24);
}

#ifndef TC_NO_COMPILER_INT64
unsigned __int64 MirrorBytes64 (unsigned __int64 x)
{
	unsigned __int64 n = (unsigned __int8) x;
	n <<= 8; n |= (unsigned __int8) (x >> 8);
	n <<= 8; n |= (unsigned __int8) (x >> 16);
	n <<= 8; n |= (unsigned __int8) (x >> 24);
	n <<= 8; n |= (unsigned __int8) (x >> 32);
	n <<= 8; n |= (unsigned __int8) (x >> 40);
	n <<= 8; n |= (unsigned __int8) (x >> 48);
	return (n << 8) | (unsigned __int8) (x >> 56);
}
#endif

void
LongReverse (unsigned __int32 *buffer, unsigned byteCount)
{
	unsigned __int32 value;

	byteCount /= sizeof (unsigned __int32);
	while (byteCount--)
	{
		value = *buffer;
		value = ((value & 0xFF00FF00L) >> 8) | \
		    ((value & 0x00FF00FFL) << 8);
		*buffer++ = (value << 16) | (value >> 16);
	}
}