1 /*
2 * Copyright (C) 2014 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 //#define LOG_NDEBUG 0
18 #define LOG_TAG "MidiIoWrapper"
19 #include <utils/Log.h>
20 #include <utils/RefBase.h>
21
22 #include <sys/stat.h>
23 #include <fcntl.h>
24
25 #include <media/MidiIoWrapper.h>
26
readAt(void * handle,void * buffer,int pos,int size)27 static int readAt(void *handle, void *buffer, int pos, int size) {
28 return ((android::MidiIoWrapper*)handle)->readAt(buffer, pos, size);
29 }
size(void * handle)30 static int size(void *handle) {
31 return ((android::MidiIoWrapper*)handle)->size();
32 }
33
34 namespace android {
35
MidiIoWrapper(const char * path)36 MidiIoWrapper::MidiIoWrapper(const char *path) {
37 ALOGV("MidiIoWrapper(%s)", path);
38 mFd = open(path, O_RDONLY | O_LARGEFILE);
39 mBase = 0;
40 mLength = lseek(mFd, 0, SEEK_END);
41 mDataSource = nullptr;
42 }
43
MidiIoWrapper(int fd,off64_t offset,int64_t size)44 MidiIoWrapper::MidiIoWrapper(int fd, off64_t offset, int64_t size) {
45 ALOGV("MidiIoWrapper(fd=%d)", fd);
46 mFd = fd < 0 ? -1 : dup(fd);
47 mBase = offset;
48 mLength = size;
49 mDataSource = nullptr;
50 }
51
MidiIoWrapper(DataSourceBase * source)52 MidiIoWrapper::MidiIoWrapper(DataSourceBase *source) {
53 ALOGV("MidiIoWrapper(DataSource)");
54 mFd = -1;
55 mDataSource = source;
56 off64_t l;
57 if (mDataSource->getSize(&l) == OK) {
58 mLength = l;
59 } else {
60 mLength = 0;
61 }
62 }
63
~MidiIoWrapper()64 MidiIoWrapper::~MidiIoWrapper() {
65 ALOGV("~MidiIoWrapper");
66 if (mFd >= 0) {
67 close(mFd);
68 }
69 }
70
readAt(void * buffer,int offset,int size)71 int MidiIoWrapper::readAt(void *buffer, int offset, int size) {
72 ALOGV("readAt(%p, %d, %d)", buffer, offset, size);
73
74 if (mDataSource != NULL) {
75 return mDataSource->readAt(offset, buffer, size);
76 }
77 if (mFd < 0) {
78 errno = EBADF;
79 return -1; // as per failed read.
80 }
81 lseek(mFd, mBase + offset, SEEK_SET);
82 if (offset + size > mLength) {
83 size = mLength - offset;
84 }
85 return read(mFd, buffer, size);
86 }
87
size()88 int MidiIoWrapper::size() {
89 ALOGV("size() = %d", int(mLength));
90 return mLength;
91 }
92
getLocator()93 EAS_FILE_LOCATOR MidiIoWrapper::getLocator() {
94 mEasFile.handle = this;
95 mEasFile.readAt = ::readAt;
96 mEasFile.size = ::size;
97 return &mEasFile;
98 }
99
100 } // namespace android
101