VeraCrypt/src/Common/Endian.c

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/*
Legal Notice: Some portions of the source code contained in this file were
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derived from the source code of TrueCrypt 7.1a, which is
Copyright (c) 2003-2012 TrueCrypt Developers Association and which is
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governed by the TrueCrypt License 3.0, also from the source code of
Encryption for the Masses 2.02a, which is Copyright (c) 1998-2000 Paul Le Roux
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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)
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and all other portions of this file are Copyright (c) 2013-2016 IDRIX
and are governed by the Apache License 2.0 the full text of which is
contained in the file License.txt included in VeraCrypt 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
uint64 MirrorBytes64 (uint64 x)
{
uint64 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);
}
}