wiiu-nanddumper-payload/ios_kernel/source/utils.c

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2016-12-12 19:31:02 +01:00
/***************************************************************************
* Copyright (C) 2016
* by Dimok
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any
* damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any
* purpose, including commercial applications, and to alter it and
* redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you
* must not claim that you wrote the original software. If you use
* this software in a product, an acknowledgment in the product
* documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and
* must not be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
***************************************************************************/
// this memcpy is optimized for speed and to work with MEM1 32 bit access alignment requirement
void reverse_memcpy(void* dst, const void* src, unsigned int size)
{
const unsigned char *src_p;
unsigned char *dst_p;
if((size >= 4) && !((dst - src) & 3))
{
const unsigned int *src_p32;
unsigned int *dst_p32;
unsigned int endDst = ((unsigned int)dst) + size;
unsigned int endRest = endDst & 3;
if(endRest)
{
src_p = ((const unsigned char*)(src + size)) - 1;
dst_p = ((unsigned char*)endDst) - 1;
size -= endRest;
while(endRest--)
*dst_p-- = *src_p--;
}
src_p32 = ((const unsigned int*)(src + size)) - 1;
dst_p32 = ((unsigned int*)(dst + size)) - 1;
unsigned int size32 = size >> 5;
if(size32)
{
size &= 0x1F;
while(size32--)
{
src_p32 -= 8;
dst_p32 -= 8;
dst_p32[8] = src_p32[8];
dst_p32[7] = src_p32[7];
dst_p32[6] = src_p32[6];
dst_p32[5] = src_p32[5];
dst_p32[4] = src_p32[4];
dst_p32[3] = src_p32[3];
dst_p32[2] = src_p32[2];
dst_p32[1] = src_p32[1];
}
}
unsigned int size4 = size >> 2;
if(size4)
{
size &= 3;
while(size4--)
*dst_p32-- = *src_p32--;
}
dst_p = ((unsigned char*)dst_p32) + 3;
src_p = ((const unsigned char*)src_p32) + 3;
}
else
{
dst_p = ((unsigned char*)dst) + size - 1;
src_p = ((const unsigned char*)src) + size - 1;
}
while(size--)
*dst_p-- = *src_p--;
}