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/** \file
* \brief Binary Data Utilities
*
* See Copyright Notice in im_lib.h
* $Id: im_bin.cpp,v 1.1 2008/10/17 06:10:16 scuri Exp $
*/
#include <assert.h>
#include "im_util.h"
int imBinCPUByteOrder(void)
{
static int CPUByteOrder = -1;
if (CPUByteOrder == -1)
{
unsigned short w = 0x0001;
unsigned char* b = (unsigned char*)&w;
CPUByteOrder = (b[0] == 0x01)? IM_LITTLEENDIAN: IM_BIGENDIAN;
}
return CPUByteOrder;
}
void imBinSwapBytes(void *data, int count, int size)
{
switch(size)
{
case 2:
imBinSwapBytes2(data, count);
break;
case 4:
imBinSwapBytes4(data, count);
break;
case 8:
imBinSwapBytes8(data, count);
break;
}
}
void imBinSwapBytes2(void *data, int count)
{
assert(data);
unsigned char lTemp;
unsigned char *values = (unsigned char *)data;
while (count-- != 0)
{
lTemp = values[1];
values[1] = values[0];
values[0] = lTemp;
values += 2;
}
}
void imBinSwapBytes4(void *data, int count)
{
assert(data);
unsigned char lTemp;
unsigned char *values = (unsigned char *)data;
while (count-- != 0)
{
lTemp = values[3];
values[3] = values[0];
values[0] = lTemp;
lTemp = values[2];
values[2] = values[1];
values[1] = lTemp;
values += 4;
}
}
void imBinSwapBytes8(void *data, int count)
{
assert(data);
unsigned char lTemp;
unsigned char *values = (unsigned char *)data;
assert(values);
while (count-- != 0)
{
lTemp = values[7];
values[7] = values[0];
values[0] = lTemp;
lTemp = values[6];
values[6] = values[1];
values[1] = lTemp;
lTemp = values[5];
values[5] = values[2];
values[2] = lTemp;
lTemp = values[4];
values[4] = values[3];
values[3] = lTemp;
values += 8;
}
}
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