1 /*
2 * Copyright (C) 2017 The Android Open Source Project
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 BYTE_UTILS_H
18
19 #define BYTE_UTILS_H
20
21 #include <arpa/inet.h>
22
23 namespace android {
24
FOURCC(unsigned char c1,unsigned char c2,unsigned char c3,unsigned char c4)25 constexpr int FOURCC(unsigned char c1, unsigned char c2, unsigned char c3, unsigned char c4) {
26 return ((c1) << 24 | (c2) << 16 | (c3) << 8 | (c4));
27 }
28
29 template <size_t N>
FOURCC(const char (& s)[N])30 constexpr int32_t FOURCC(const char (&s) [N]) {
31 static_assert(N == 5, "fourcc: wrong length");
32 return
33 (unsigned char) s[0] << 24 |
34 (unsigned char) s[1] << 16 |
35 (unsigned char) s[2] << 8 |
36 (unsigned char) s[3] << 0;
37 }
38
39
40 uint16_t U16_AT(const uint8_t *ptr);
41 uint32_t U32_AT(const uint8_t *ptr);
42 uint64_t U64_AT(const uint8_t *ptr);
43
44 uint16_t U16LE_AT(const uint8_t *ptr);
45 uint32_t U32LE_AT(const uint8_t *ptr);
46 uint64_t U64LE_AT(const uint8_t *ptr);
47
48 uint64_t ntoh64(uint64_t x);
49 uint64_t hton64(uint64_t x);
50
51 void MakeFourCCString(uint32_t x, char *s);
52
53 } // namespace android
54
55 #endif // BYTE_UTILS_H
56
57