1/*
2 * Copyright 2011 Google Inc. All Rights Reserved.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SFNTLY_CPP_SRC_SFNTLY_PORT_ENDIAN_H_
18#define SFNTLY_CPP_SRC_SFNTLY_PORT_ENDIAN_H_
19
20#include "sfntly/port/config.h"
21#include "sfntly/port/type.h"
22
23namespace sfntly {
24
25static inline uint16_t EndianSwap16(uint16_t value) {
26  return (uint16_t)((value >> 8) | (value << 8));
27}
28
29static inline int32_t EndianSwap32(int32_t value) {
30  return (((value & 0x000000ff) << 24) |
31          ((value & 0x0000ff00) <<  8) |
32          ((value & 0x00ff0000) >>  8) |
33          ((value & 0xff000000) >> 24));
34}
35
36static inline uint64_t EndianSwap64(uint64_t value) {
37  return (((value & 0x00000000000000ffLL) << 56) |
38          ((value & 0x000000000000ff00LL) << 40) |
39          ((value & 0x0000000000ff0000LL) << 24) |
40          ((value & 0x00000000ff000000LL) << 8)  |
41          ((value & 0x000000ff00000000LL) >> 8)  |
42          ((value & 0x0000ff0000000000LL) >> 24) |
43          ((value & 0x00ff000000000000LL) >> 40) |
44          ((value & 0xff00000000000000LL) >> 56));
45}
46
47#ifdef SFNTLY_LITTLE_ENDIAN
48  #define ToBE16(n) EndianSwap16(n)
49  #define ToBE32(n) EndianSwap32(n)
50  #define ToBE64(n) EndianSwap64(n)
51  #define ToLE16(n) (n)
52  #define ToLE32(n) (n)
53  #define ToLE64(n) (n)
54  #define FromBE16(n) EndianSwap16(n)
55  #define FromBE32(n) EndianSwap32(n)
56  #define FromBE64(n) EndianSwap64(n)
57  #define FromLE16(n) (n)
58  #define FromLE32(n) (n)
59  #define FromLE64(n) (n)
60#else  // SFNTLY_BIG_ENDIAN
61  #define ToBE16(n) (n)
62  #define ToBE32(n) (n)
63  #define ToBE64(n) (n)
64  #define ToLE16(n) EndianSwap16(n)
65  #define ToLE32(n) EndianSwap32(n)
66  #define ToLE64(n) EndianSwap64(n)
67  #define FromBE16(n) (n)
68  #define FromBE32(n) (n)
69  #define FromBE64(n) (n)
70  #define FromLE16(n) EndianSwap16(n)
71  #define FromLE32(n) EndianSwap32(n)
72  #define FromLE64(n) EndianSwap64(n)
73#endif
74
75}  // namespace sfntly
76
77#endif  // SFNTLY_CPP_SRC_SFNTLY_PORT_ENDIAN_H_
78