libcore-stub/src/main/java/libcore/io/Streams.java

/*
 * Copyright (C) 2010 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 libcore.io;

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

public final class Streams {
    private Streams() {}

    /**
     * Returns a byte[] containing the remainder of 'in', closing it when done.
     */
    public static byte[] readFully(InputStream in) throws IOException {
        try {
            return readFullyNoClose(in);
        } finally {
            in.close();
        }
    }

    /**
     * Returns a byte[] containing the remainder of 'in'.
     */
    private static byte[] readFullyNoClose(InputStream in) throws IOException {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int count;
        while ((count = in.read(buffer)) != -1) {
            bytes.write(buffer, 0, count);
        }
        return bytes.toByteArray();
    }

    /**
     * Copies all of the bytes from {@code in} to {@code out}. Neither stream is closed.
     * Returns the total number of bytes transferred.
     */
    public static int copy(InputStream in, OutputStream out) throws IOException {
        int total = 0;
        byte[] buffer = new byte[8192];
        int c;
        while ((c = in.read(buffer)) != -1) {
            total += c;
            out.write(buffer, 0, c);
        }
        return total;
    }
}