/*
|
* Copyright (C) 2014 The Android Open Source Project
|
*
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
* you may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at
|
*
|
* http://www.apache.org/licenses/LICENSE-2.0
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*/
|
|
//#define LOG_NDEBUG 0
|
#define LOG_TAG "MidiIoWrapper"
|
#include <utils/Log.h>
|
#include <utils/RefBase.h>
|
|
#include <sys/stat.h>
|
#include <fcntl.h>
|
|
#include <media/MidiIoWrapper.h>
|
#include <media/MediaExtractorPluginApi.h>
|
|
static int readAt(void *handle, void *buffer, int pos, int size) {
|
return ((android::MidiIoWrapper*)handle)->readAt(buffer, pos, size);
|
}
|
static int size(void *handle) {
|
return ((android::MidiIoWrapper*)handle)->size();
|
}
|
|
namespace android {
|
|
MidiIoWrapper::MidiIoWrapper(const char *path) {
|
ALOGV("MidiIoWrapper(%s)", path);
|
mFd = open(path, O_RDONLY | O_LARGEFILE);
|
mBase = 0;
|
mLength = lseek(mFd, 0, SEEK_END);
|
mDataSource = nullptr;
|
}
|
|
MidiIoWrapper::MidiIoWrapper(int fd, off64_t offset, int64_t size) {
|
ALOGV("MidiIoWrapper(fd=%d)", fd);
|
mFd = fd < 0 ? -1 : dup(fd);
|
mBase = offset;
|
mLength = size;
|
mDataSource = nullptr;
|
}
|
|
class DataSourceUnwrapper : public DataSourceBase {
|
|
public:
|
explicit DataSourceUnwrapper(CDataSource *csource) {
|
mSource = csource;
|
}
|
|
virtual ~DataSourceUnwrapper() {}
|
|
virtual status_t initCheck() const { return OK; }
|
|
// Returns the number of bytes read, or -1 on failure. It's not an error if
|
// this returns zero; it just means the given offset is equal to, or
|
// beyond, the end of the source.
|
virtual ssize_t readAt(off64_t offset, void *data, size_t size) {
|
return mSource->readAt(mSource->handle, offset, data, size);
|
}
|
|
// May return ERROR_UNSUPPORTED.
|
virtual status_t getSize(off64_t *size) {
|
return mSource->getSize(mSource->handle, size);
|
}
|
|
virtual bool getUri(char * /*uriString*/, size_t /*bufferSize*/) {
|
return false;
|
}
|
|
virtual uint32_t flags() {
|
return 0;
|
}
|
|
virtual void close() {};
|
private:
|
CDataSource *mSource;
|
};
|
|
MidiIoWrapper::MidiIoWrapper(CDataSource *csource) {
|
ALOGV("MidiIoWrapper(CDataSource)");
|
mFd = -1;
|
mBase = 0;
|
mDataSource = new DataSourceUnwrapper(csource);
|
off64_t l;
|
if (mDataSource->getSize(&l) == OK) {
|
mLength = l;
|
} else {
|
mLength = 0;
|
}
|
}
|
|
MidiIoWrapper::~MidiIoWrapper() {
|
ALOGV("~MidiIoWrapper");
|
if (mFd >= 0) {
|
close(mFd);
|
}
|
delete mDataSource;
|
}
|
|
int MidiIoWrapper::readAt(void *buffer, int offset, int size) {
|
ALOGV("readAt(%p, %d, %d)", buffer, offset, size);
|
|
if (mDataSource != NULL) {
|
return mDataSource->readAt(offset, buffer, size);
|
}
|
if (mFd < 0) {
|
errno = EBADF;
|
return -1; // as per failed read.
|
}
|
lseek(mFd, mBase + offset, SEEK_SET);
|
if (offset + size > mLength) {
|
size = mLength - offset;
|
}
|
return read(mFd, buffer, size);
|
}
|
|
int MidiIoWrapper::size() {
|
ALOGV("size() = %d", int(mLength));
|
return mLength;
|
}
|
|
EAS_FILE_LOCATOR MidiIoWrapper::getLocator() {
|
mEasFile.handle = this;
|
mEasFile.readAt = ::readAt;
|
mEasFile.size = ::size;
|
return &mEasFile;
|
}
|
|
} // namespace android
|
