Utils.cpp revision ee7ff20e69498ebd53dd9717a0f984188341a75e 
1/*
2 * Copyright (C) 2009 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#include <arpa/inet.h>
18
19#include <media/stagefright/Utils.h>
20
21namespace android {
22
23uint16_t U16_AT(const uint8_t *ptr) {
24    return ptr[0] << 8 | ptr[1];
25}
26
27uint32_t U32_AT(const uint8_t *ptr) {
28    return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
29}
30
31uint64_t U64_AT(const uint8_t *ptr) {
32    return ((uint64_t)U32_AT(ptr)) << 32 | U32_AT(ptr + 4);
33}
34
35uint16_t U16LE_AT(const uint8_t *ptr) {
36    return ptr[0] | (ptr[1] << 8);
37}
38
39uint32_t U32LE_AT(const uint8_t *ptr) {
40    return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0];
41}
42
43uint64_t U64LE_AT(const uint8_t *ptr) {
44    return ((uint64_t)U32LE_AT(ptr + 4)) << 32 | U32LE_AT(ptr);
45}
46
47// XXX warning: these won't work on big-endian host.
48uint64_t ntoh64(uint64_t x) {
49    return ((uint64_t)ntohl(x & 0xffffffff) << 32) | ntohl(x >> 32);
50}
51
52uint64_t hton64(uint64_t x) {
53    return ((uint64_t)htonl(x & 0xffffffff) << 32) | htonl(x >> 32);
54}
55
56}  // namespace android
57
58