net.siisise.io.ArrayOutputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of softlib Show documentation

Java simple API Packet io, base64, etc...

There is a newer version: 1.1.15

/*
 * Copyright 2019-2022 Siisise Net.
 *
 * 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 net.siisise.io;

import java.io.*;

/**
 * 固定サイズ配列へのStream.
 *
 * Created on 2007/03/11, 1:22
 *
 */
public class ArrayOutputStream extends OutputStream {

    final byte[] buff;
    int offset;

    /**
     * 長さを決めて配列をストリームの受け口にする。
     * @param size 配列長 
     */
    public ArrayOutputStream(int size) {
        buff = new byte[size];
        offset = 0;
    }

    /**
     * 配列を用意してストリーム出力先にする。
     * @param data 転送先配列 
     */
    public ArrayOutputStream(byte[] data) {
        buff = data;
        offset = 0;
    }

    /**
     * 配列の特定位置からストリーム出力先にする。
     * @param data
     * @param offset 
     */
    public ArrayOutputStream(byte[] data, int offset) {
        buff = data;
        this.offset = offset;
    }

    @Override
    public void write(int d) throws IOException {
        try {
            buff[offset++] = (byte) d;
        } catch (IndexOutOfBoundsException e) {
            throw new IOException(e);
        }
    }

    /**
     * 
     * @param data 書き着込むデータ
     * @param offset データの先頭位置
     * @param length データの長さ
     * @throws IOException 配列サイズを超えたとき 
     */
    @Override
    public void write(byte[] data, int offset, int length) throws IOException {
        try {
            System.arraycopy(data, offset, buff, this.offset, length);
            this.offset += length;
        } catch (IndexOutOfBoundsException e) {
            throw new IOException(e);
        }
    }

    /**
     * 複製しない コンストラクタで指定した内部バッファを渡す
     * @return 内部配列
     */
    public byte[] toByteArray() {
        return buff;
    }

}