src/com/android/tradefed/util/proto/TestRecordProtoUtil.java

/*
 * Copyright (C) 2018 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.
 */
package com.android.tradefed.util.proto;

import com.android.tradefed.result.proto.TestRecordProto.TestRecord;
import com.android.tradefed.util.ByteArrayList;

import com.google.protobuf.CodedInputStream;
import com.google.protobuf.InvalidProtocolBufferException;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/** Utility to read the {@link TestRecord} proto from a file. */
public class TestRecordProtoUtil {

    /**
     * Read {@link TestRecord} from a file and return it.
     *
     * @param protoFile The {@link File} containing the record
     * @return a {@link TestRecord} created from the file.
     * @throws IOException, InvalidProtocolBufferException
     */
    public static TestRecord readFromFile(File protoFile)
            throws IOException, InvalidProtocolBufferException {
        TestRecord record = null;
        try (InputStream stream = new FileInputStream(protoFile)) {
            CodedInputStream is = CodedInputStream.newInstance(stream);
            is.setSizeLimit(Integer.MAX_VALUE);
            ByteArrayList data = new ByteArrayList();
            while (!is.isAtEnd()) {
                int size = is.readRawVarint32();
                data.addAll(is.readRawBytes(size));
            }
            record = TestRecord.parseFrom(data.getContents());
        }
        return record;
    }
}