//=========================================================================
// FILENAME	: misc.c
// DESCRIPTION	: Miscelleneous funcs
//=========================================================================
// Copyright (c) 2008- NETGEAR, Inc. All Rights Reserved.
//=========================================================================

/* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#include <stdio.h>
#include <string.h>
#ifdef HAVE_MACHINE_ENDIAN_H
#include <machine/endian.h>
#else
#include <endian.h>
#endif

#include "misc.h"

inline __u16
le16_to_cpu(__u16 le16)
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
	return le16;
#else
	__u16 be16 = ((le16 << 8) & 0xff00) | ((le16 >> 8) & 0x00ff);
	return be16;
#endif
}

inline __u32
le32_to_cpu(__u32 le32)
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
	return le32;
#else
	__u32 be32 =
		((le32 << 24) & 0xff000000) |
		((le32 << 8) & 0x00ff0000) |
		((le32 >> 8) & 0x0000ff00) |
		((le32 >> 24) & 0x000000ff);
	return be32;
#endif
}

inline __u64
le64_to_cpu(__u64 le64)
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
	return le64;
#else
	__u64 be64;
	__u8 *le64p = (__u8*)&le64;
	__u8 *be64p = (__u8*)&be64;
	be64p[0] = le64p[7];
	be64p[1] = le64p[6];
	be64p[2] = le64p[5];
	be64p[3] = le64p[4];
	be64p[4] = le64p[3];
	be64p[5] = le64p[2];
	be64p[6] = le64p[1];
	be64p[7] = le64p[0];
	return be64;
#endif
}

inline __u8
fget_byte(FILE *fp)
{
	__u8 d;

	if (!fread(&d, sizeof(d), 1, fp))
		return 0;
	return d;
}

inline __u16
fget_le16(FILE *fp)
{
	__u16 d;

	if (!fread(&d, sizeof(d), 1, fp))
		return 0;
	d = le16_to_cpu(d);
	return d;
}

inline __u32
fget_le32(FILE *fp)
{
	__u32 d;

	if (!fread(&d, sizeof(d), 1, fp))
		return 0;
	d = le32_to_cpu(d);
	return d;
}

inline __u32
cpu_to_be32(__u32 cpu32)
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
	__u32 be32 =
		((cpu32 << 24) & 0xff000000) |
		((cpu32 << 8) & 0x00ff0000) |
		((cpu32 >> 8) & 0x0000ff00) |
		((cpu32 >> 24) & 0x000000ff);
	return be32;
#else
	return cpu32;
#endif
}
