| 1 | /* libFLAC - Free Lossless Audio Codec library |
| 2 | * Copyright (C) 2012-2016 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 | #define ENDSWAP_64(x) (__builtin_bswap64 (x)) |
| 47 | |
| 48 | #elif defined _MSC_VER /* Windows */ |
| 49 | |
| 50 | #include <stdlib.h> |
| 51 | |
| 52 | #define ENDSWAP_16(x) (_byteswap_ushort (x)) |
| 53 | #define ENDSWAP_32(x) (_byteswap_ulong (x)) |
| 54 | #define ENDSWAP_64(x) (_byteswap_uint64 (x)) |
| 55 | |
| 56 | #elif defined HAVE_BYTESWAP_H /* Linux */ |
| 57 | |
| 58 | #include <byteswap.h> |
| 59 | |
| 60 | #define ENDSWAP_16(x) (bswap_16 (x)) |
| 61 | #define ENDSWAP_32(x) (bswap_32 (x)) |
| 62 | #define ENDSWAP_64(x) (bswap_64 (x)) |
| 63 | |
| 64 | #else |
| 65 | |
| 66 | #define ENDSWAP_16(x) ((((x) >> 8) & 0xFF) | (((x) & 0xFF) << 8)) |
| 67 | #define ENDSWAP_32(x) ((((x) >> 24) & 0xFF) | (((x) >> 8) & 0xFF00) | (((x) & 0xFF00) << 8) | (((x) & 0xFF) << 24)) |
| 68 | #define ENDSWAP_64(x) ((ENDSWAP_32(((x) >> 32) & 0xFFFFFFFF)) | (ENDSWAP_32((x) & 0xFFFFFFFF) << 32)) |
| 69 | |
| 70 | #endif |
| 71 | |
| 72 | |
| 73 | /* Host to little-endian byte swapping (for MD5 calculation) */ |
| 74 | #if CPU_IS_BIG_ENDIAN |
| 75 | |
| 76 | #define H2LE_16(x) ENDSWAP_16 (x) |
| 77 | #define H2LE_32(x) ENDSWAP_32 (x) |
| 78 | |
| 79 | #else |
| 80 | |
| 81 | #define H2LE_16(x) (x) |
| 82 | #define H2LE_32(x) (x) |
| 83 | |
| 84 | #endif |