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 #include <byteswap.h> 55 56 #define ENDSWAP_16(x) (bswap_16 (x)) 57 #define ENDSWAP_32(x) (bswap_32 (x)) 58 59 #else 60 61 #define ENDSWAP_16(x) ((((x) >> 8) & 0xFF) | (((x) & 0xFF) << 8)) 62 #define ENDSWAP_32(x) ((((x) >> 24) & 0xFF) | (((x) >> 8) & 0xFF00) | (((x) & 0xFF00) << 8) | (((x) & 0xFF) << 24)) 63 64 #endif 65 66 67 /* Host to little-endian byte swapping. */ 68 #if CPU_IS_BIG_ENDIAN 69 70 #define H2LE_16(x) ENDSWAP_16 (x) 71 #define H2LE_32(x) ENDSWAP_32 (x) 72 73 #else 74 75 #define H2LE_16(x) (x) 76 #define H2LE_32(x) (x) 77 78 #endif 79
