/*
 * Copyright (C) 2011 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_TAG "WVMFileSource"
#include <utils/Log.h>

#include "WVMFileSource.h"
#include "media/stagefright/MediaErrors.h"
#include "media/stagefright/MediaDefs.h"
#include "media/stagefright/MediaDebug.h"

namespace android {


WVMFileSource::WVMFileSource(sp<DataSource> &dataSource)
    : mDataSource(dataSource),
      mOffset(0), mLogOnce(true)
{
}

unsigned long long WVMFileSource::GetSize()
{
    off64_t size;
    mDataSource->getSize(&size);
    return size;
}

unsigned long long WVMFileSource::GetOffset()
{
    return mOffset;
}

void WVMFileSource::Seek(unsigned long long offset)
{
    mOffset = offset;
}

size_t WVMFileSource::Read(size_t amount, unsigned char *buffer)
{
    ssize_t result = mDataSource->readAt(mOffset, buffer, amount);

    if (result < 0) {
        if (mLogOnce) {
            LOGE("mDataSource-readAt returned error %d\n", (int)result );
            mLogOnce = false;
        }
        result = 0;
    } else  {
        mOffset += result;
        mLogOnce = true;
    }

    return result;
}

} // namespace android