Bytestreams.java

package com.gaiagps.iburn;

import android.support.annotation.NonNull;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/** Copied from Google Guava's Bytestreams. Original copyright header: */
/*
 * Copyright (C) 2007 The Guava 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.
 */
public class Bytestreams {

    private static final int BUF_SIZE = 8192;

    /**
     * Copies all bytes from the input stream to the output stream.
     * Does not close or flush either stream.
     *
     * @param from the input stream to read from
     * @param to the output stream to write to
     * @return the number of bytes copied
     * @throws IOException if an I/O error occurs
     */
    public static long copy(@NonNull InputStream from, @NonNull OutputStream to)
            throws IOException {
        byte[] buf = new byte[BUF_SIZE];
        long total = 0;
        while (true) {
            int r = from.read(buf);
            if (r == -1) {
                break;
            }
            to.write(buf, 0, r);
            total += r;
        }
        return total;
    }
}