Reads from an random access file (RandomAccessFile) until the provided array is filled. - Android java.lang

Android examples for java.lang:Array Element

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Description

Reads from an random access file (RandomAccessFile) until the provided array is filled.

Demo Code

/*/*from ww  w.  j  a va2  s.co m*/
 * Copyright (C) 2015 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.
 */
import com.android.annotations.NonNull;
import java.io.IOException;
import java.io.RandomAccessFile;

public class Main{
    /**
     * Reads from an random access file until the provided array is filled.
     * @param raf the file to read data from
     * @param data the array that will receive the data
     * @throws IOException
     */
    public static void fullyRead(@NonNull RandomAccessFile raf,
            @NonNull byte[] data) throws IOException {
        int r;
        int p = 0;

        while ((r = raf.read(data, p, data.length - p)) > 0) {
            p += r;
            if (p == data.length) {
                break;
            }
        }

        if (p < data.length) {
            throw new IOException("Failed to read " + data.length
                    + " bytes from file. Only " + p
                    + " bytes could be read.");
        }
    }
}

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