source/modules/juce_audio_formats/codecs/flac/endswap.h

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2012-2014  Xiph.org Foundation
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /* It is assumed that this header will be included after "config.h". */
  33
  34 #if HAVE_BSWAP32                        /* GCC and Clang */
  35
  36 /* GCC prior to 4.8 didn't provide bswap16 on x86_64 */
  37 #if ! HAVE_BSWAP16
  38 static inline unsigned short __builtin_bswap16(unsigned short a)
  39 {
  40         return (a<<8)|(a>>8);
  41 }
  42 #endif
  43
  44 #define ENDSWAP_16(x)           (__builtin_bswap16 (x))
  45 #define ENDSWAP_32(x)           (__builtin_bswap32 (x))
  46
  47 #elif defined _MSC_VER          /* Windows. Apparently in <stdlib.h>. */
  48
  49 #define ENDSWAP_16(x)           (_byteswap_ushort (x))
  50 #define ENDSWAP_32(x)           (_byteswap_ulong (x))
  51
  52 #elif defined HAVE_BYTESWAP_H           /* Linux */
  53
  54 // JUCE: removed as JUCE already includes standard headers and including
  55 // these in FlacNamespace will cause problems
  56 //#include <byteswap.h>
  57
  58 #define ENDSWAP_16(x)           (bswap_16 (x))
  59 #define ENDSWAP_32(x)           (bswap_32 (x))
  60
  61 #else
  62
  63 #define ENDSWAP_16(x)           ((((x) >> 8) & 0xFF) | (((x) & 0xFF) << 8))
  64 #define ENDSWAP_32(x)           ((((x) >> 24) & 0xFF) | (((x) >> 8) & 0xFF00) | (((x) & 0xFF00) << 8) | (((x) & 0xFF) << 24))
  65
  66 #endif
  67
  68
  69 /* Host to little-endian byte swapping. */
  70 #if CPU_IS_BIG_ENDIAN
  71
  72 #define H2LE_16(x)              ENDSWAP_16 (x)
  73 #define H2LE_32(x)              ENDSWAP_32 (x)
  74
  75 #else
  76
  77 #define H2LE_16(x)              (x)
  78 #define H2LE_32(x)              (x)
  79
  80 #endif