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 //#define LOG_NDEBUG 0
17 #define LOG_TAG "DataSourceBase"
18
19 #include <media/DataSourceBase.h>
20 #include <media/stagefright/foundation/ByteUtils.h>
21 #include <media/stagefright/MediaErrors.h>
22 #include <utils/String8.h>
23
24 namespace android {
25
getUInt16(off64_t offset,uint16_t * x)26 bool DataSourceBase::getUInt16(off64_t offset, uint16_t *x) {
27 *x = 0;
28
29 uint8_t byte[2];
30 if (readAt(offset, byte, 2) != 2) {
31 return false;
32 }
33
34 *x = (byte[0] << 8) | byte[1];
35
36 return true;
37 }
38
getUInt24(off64_t offset,uint32_t * x)39 bool DataSourceBase::getUInt24(off64_t offset, uint32_t *x) {
40 *x = 0;
41
42 uint8_t byte[3];
43 if (readAt(offset, byte, 3) != 3) {
44 return false;
45 }
46
47 *x = (byte[0] << 16) | (byte[1] << 8) | byte[2];
48
49 return true;
50 }
51
getUInt32(off64_t offset,uint32_t * x)52 bool DataSourceBase::getUInt32(off64_t offset, uint32_t *x) {
53 *x = 0;
54
55 uint32_t tmp;
56 if (readAt(offset, &tmp, 4) != 4) {
57 return false;
58 }
59
60 *x = ntohl(tmp);
61
62 return true;
63 }
64
getUInt64(off64_t offset,uint64_t * x)65 bool DataSourceBase::getUInt64(off64_t offset, uint64_t *x) {
66 *x = 0;
67
68 uint64_t tmp;
69 if (readAt(offset, &tmp, 8) != 8) {
70 return false;
71 }
72
73 *x = ntoh64(tmp);
74
75 return true;
76 }
77
getUInt16Var(off64_t offset,uint16_t * x,size_t size)78 bool DataSourceBase::getUInt16Var(off64_t offset, uint16_t *x, size_t size) {
79 if (size == 2) {
80 return getUInt16(offset, x);
81 }
82 if (size == 1) {
83 uint8_t tmp;
84 if (readAt(offset, &tmp, 1) == 1) {
85 *x = tmp;
86 return true;
87 }
88 }
89 return false;
90 }
91
getUInt32Var(off64_t offset,uint32_t * x,size_t size)92 bool DataSourceBase::getUInt32Var(off64_t offset, uint32_t *x, size_t size) {
93 if (size == 4) {
94 return getUInt32(offset, x);
95 }
96 if (size == 2) {
97 uint16_t tmp;
98 if (getUInt16(offset, &tmp)) {
99 *x = tmp;
100 return true;
101 }
102 }
103 return false;
104 }
105
getUInt64Var(off64_t offset,uint64_t * x,size_t size)106 bool DataSourceBase::getUInt64Var(off64_t offset, uint64_t *x, size_t size) {
107 if (size == 8) {
108 return getUInt64(offset, x);
109 }
110 if (size == 4) {
111 uint32_t tmp;
112 if (getUInt32(offset, &tmp)) {
113 *x = tmp;
114 return true;
115 }
116 }
117 return false;
118 }
119
getSize(off64_t * size)120 status_t DataSourceBase::getSize(off64_t *size) {
121 *size = 0;
122
123 return ERROR_UNSUPPORTED;
124 }
125
getUri(char * uriString __unused,size_t bufferSize __unused)126 bool DataSourceBase::getUri(char *uriString __unused, size_t bufferSize __unused) {
127 return false;
128 }
129
130 } // namespace android
131