pulseaudio/src/pulsecore/endianmacros.h

#ifndef fooendianmacroshfoo
#define fooendianmacroshfoo

/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering
  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PulseAudio 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 Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#include <inttypes.h>

#ifndef PACKAGE
#error "Please include config.h before including this file!"
#endif

#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif

#ifdef HAVE_BYTESWAP_H
#define PA_INT16_SWAP(x) ((int16_t) bswap_16((uint16_t) x))
#define PA_UINT16_SWAP(x) ((uint16_t) bswap_16((uint16_t) x))
#define PA_INT32_SWAP(x) ((int32_t) bswap_32((uint32_t) x))
#define PA_UINT32_SWAP(x) ((uint32_t) bswap_32((uint32_t) x))
#else
#define PA_INT16_SWAP(x) ( (int16_t) ( ((uint16_t) x >> 8) | ((uint16_t) x << 8) ) )
#define PA_UINT16_SWAP(x) ( (uint16_t) ( ((uint16_t) x >> 8) | ((uint16_t) x << 8) ) )
#define PA_INT32_SWAP(x) ( (int32_t) ( ((uint32_t) x >> 24) | ((uint32_t) x << 24) | (((uint32_t) x & 0xFF00) << 8) | ((((uint32_t) x) >> 8) & 0xFF00) ) )
#define PA_UINT32_SWAP(x) ( (uint32_t) ( ((uint32_t) x >> 24) | ((uint32_t) x << 24) | (((uint32_t) x & 0xFF00) << 8) | ((((uint32_t) x) >> 8) & 0xFF00) ) )
#endif

static inline float PA_FLOAT32_SWAP(float x) {
    uint32_t i = *(uint32_t*) &x;
    i = PA_UINT32_SWAP(i);
    return *(float*) &i;
}

#define PA_MAYBE_INT16_SWAP(c,x) ((c) ? PA_INT32_SWAP(x) : x)
#define PA_MAYBE_UINT16_SWAP(c,x) ((c) ? PA_UINT32_SWAP(x) : x)

#define PA_MAYBE_INT32_SWAP(c,x) ((c) ? PA_INT32_SWAP(x) : x)
#define PA_MAYBE_UINT32_SWAP(c,x) ((c) ? PA_UINT32_SWAP(x) : x)

#define PA_MAYBE_FLOAT32_SWAP(c,x) ((c) ? PA_FLOAT32_SWAP(x) : x)

#ifdef WORDS_BIGENDIAN
 #define PA_INT16_FROM_LE(x) PA_INT16_SWAP(x)
 #define PA_INT16_FROM_BE(x) ((int16_t)(x))

 #define PA_INT16_TO_LE(x) PA_INT16_SWAP(x)
 #define PA_INT16_TO_BE(x) ((int16_t)(x))

 #define PA_UINT16_FROM_LE(x) PA_UINT16_SWAP(x)
 #define PA_UINT16_FROM_BE(x) ((uint16_t)(x))

 #define PA_UINT16_TO_LE(x) PA_UINT16_SWAP(x)
 #define PA_UINT16_TO_BE(x) ((uint16_t)(x))

 #define PA_INT32_FROM_LE(x) PA_INT32_SWAP(x)
 #define PA_INT32_FROM_BE(x) ((int32_t)(x))

 #define PA_INT32_TO_LE(x) PA_INT32_SWAP(x)
 #define PA_INT32_TO_BE(x) ((int32_t)(x))

 #define PA_UINT32_FROM_LE(x) PA_UINT32_SWAP(x)
 #define PA_UINT32_FROM_BE(x) ((uint32_t)(x))

 #define PA_UINT32_TO_LE(x) PA_UINT32_SWAP(x)
 #define PA_UINT32_TO_BE(x) ((uint32_t)(x))

 #define PA_FLOAT32_TO_LE(x) PA_FLOAT32_SWAP(x)
 #define PA_FLOAT32_TO_BE(x) ((float) (x))
#else
 #define PA_INT16_FROM_LE(x) ((int16_t)(x))
 #define PA_INT16_FROM_BE(x) PA_INT16_SWAP(x)

 #define PA_INT16_TO_LE(x) ((int16_t)(x))
 #define PA_INT16_TO_BE(x) PA_INT16_SWAP(x)

 #define PA_UINT16_FROM_LE(x) ((uint16_t)(x))
 #define PA_UINT16_FROM_BE(x) PA_UINT16_SWAP(x)

 #define PA_UINT16_TO_LE(x) ((uint16_t)(x))
 #define PA_UINT16_TO_BE(x) PA_UINT16_SWAP(x)

 #define PA_INT32_FROM_LE(x) ((int32_t)(x))
 #define PA_INT32_FROM_BE(x) PA_INT32_SWAP(x)

 #define PA_INT32_TO_LE(x) ((int32_t)(x))
 #define PA_INT32_TO_BE(x) PA_INT32_SWAP(x)

 #define PA_UINT32_FROM_LE(x) ((uint32_t)(x))
 #define PA_UINT32_FROM_BE(x) PA_UINT32_SWAP(x)

 #define PA_UINT32_TO_LE(x) ((uint32_t)(x))
 #define PA_UINT32_TO_BE(x) PA_UINT32_SWAP(x)

 #define PA_FLOAT32_TO_LE(x) ((float) (x))
 #define PA_FLOAT32_TO_BE(x) PA_FLOAT32_SWAP(x)
#endif

#endif