/* -----------------------------------------------------------------------------
	GSFramework
	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
----------------------------------------------------------------------------- */


		#include "memory/endian.h"
		#include "platform_config.h"
		#include "log/log.h"


namespace GS {
	namespace Endian {

static Config g_host_endian = Undefined;

//------------------------------------------------------------------------------
void		SwapBytes(void *in_p, size_t n)
{
	if	(n == 1)
		return;

	__ASSERT__(!(n & 1));

	char *p = (char *)in_p;
	for	(size_t c = 0; c < n / 2; ++c)
	{
		char tmp = p[c];
		p[c] = p[n - c - 1];
		p[n - c - 1] = tmp;
	}
}
Config		GetHostConfiguration()
{
	if	(g_host_endian == Undefined)
	{
		union
		{
			uint	i;
			char	c[4];
		}	bint = { 0x01020304 };

		g_host_endian = bint.c[0] == 1 ? Big : Little;

		if	(g_host_endian == Big)
				__LOG__ << "Memory configuration: Big endian.\n";
		else	__LOG__ << "Memory configuration: Little endian.\n";
	}
	return g_host_endian;
}
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void		*ToHost(void *p, size_t size, Config source_endian)
{
	if	(GetHostConfiguration() != source_endian)
		SwapBytes(p, size);
	return p;
}
//------------------------------------------------------------------------------

	}
}