io.grpc.alts.internal.ByteBufTestUtils.java Source code

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Here is the source code for io.grpc.alts.internal.ByteBufTestUtils.java

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/*
 * Copyright 2018 The gRPC Authors
 *
 * 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 io.grpc.alts.internal;

import com.google.common.base.Preconditions;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public final class ByteBufTestUtils {
    public interface RegisterRef {
        ByteBuf register(ByteBuf buf);
    }

    private static final Random random = new SecureRandom();

    // The {@code ref} argument can be used to register the buffer for {@code release}.
    // TODO: allow the allocator to be passed in.
    public static ByteBuf getDirectBuffer(int len, RegisterRef ref) {
        return ref.register(Unpooled.directBuffer(len));
    }

    /** Get random bytes. */
    public static ByteBuf getRandom(int len, RegisterRef ref) {
        ByteBuf buf = getDirectBuffer(len, ref);
        byte[] bytes = new byte[len];
        random.nextBytes(bytes);
        buf.writeBytes(bytes);
        return buf;
    }

    /** Fragment byte buffer into multiple pieces. */
    public static List<ByteBuf> fragmentByteBuf(ByteBuf in, int num, RegisterRef ref) {
        ByteBuf buf = in.slice();
        Preconditions.checkArgument(num > 0);
        List<ByteBuf> fragmentedBufs = new ArrayList<>(num);
        int fragmentSize = buf.readableBytes() / num;
        while (buf.isReadable()) {
            int readBytes = num == 0 ? buf.readableBytes() : fragmentSize;
            ByteBuf tmpBuf = getDirectBuffer(readBytes, ref);
            tmpBuf.writeBytes(buf, readBytes);
            fragmentedBufs.add(tmpBuf);
            num--;
        }
        return fragmentedBufs;
    }

    static ByteBuf writeSlice(ByteBuf in, int len) {
        Preconditions.checkArgument(len <= in.writableBytes());
        ByteBuf out = in.slice(in.writerIndex(), len);
        in.writerIndex(in.writerIndex() + len);
        return out.writerIndex(0);
    }
}