source: titan/minidlna-1.0.22/tagutils/misc.c @ 13567

//=========================================================================
// 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 <stdio.h>
#include <string.h>
#include <endian.h>

#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;

        (void)fread(&d, sizeof(d), 1, fp);
        return d;
}

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

        (void)fread(&d, sizeof(d), 1, fp);
        d = le16_to_cpu(d);
        return d;
}

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

        (void)fread(&d, sizeof(d), 1, fp);
        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
}