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/*
* 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"
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);
}
MidiIoWrapper::MidiIoWrapper(int fd, off64_t offset, int64_t size) {
ALOGV("MidiIoWrapper(fd=%d)", fd);
mFd = dup(fd);
mBase = offset;
mLength = size;
}
MidiIoWrapper::MidiIoWrapper(const sp<DataSource> &source) {
ALOGV("MidiIoWrapper(DataSource)");
mFd = -1;
mDataSource = source;
off64_t l;
if (mDataSource->getSize(&l) == OK) {
mLength = l;
} else {
mLength = 0;
}
}
MidiIoWrapper::~MidiIoWrapper() {
ALOGV("~MidiIoWrapper");
close(mFd);
}
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);
}
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
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