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The buffer management utilities used for managing streams of bytes that need to be treated as structured data. These are typically used to map structured records in files to and from systems that use these files types, i.e. IBM mainframe systems.

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/*
 * Copyright (c) 2009-2020 The Last Check, LLC, All Rights Reserved
 *
 * 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 com.thelastcheck.commons.buffer;

public abstract class ByteArrayConverter {

    private final byte[] convertToTable;

    protected ByteArrayConverter() {
        convertToTable = loadConvertTable();
    }

    protected abstract byte[] loadConvertTable();

    protected abstract String outputEncoding();

    public byte[] convert(byte[] bytes) {
        return convert(bytes, 0, bytes.length);
    }

    public byte[] convert(byte[] bytes, int offset, int length) {
        if ((offset < 0) || (length < 0) || ((offset + length) > bytes.length)) {
            throw new ArrayIndexOutOfBoundsException();
        }
        byte[] bytesConverted = new byte[length];

        for (int i = offset, j = 0; j < length; i++, j++) {
            bytesConverted[j] = convert(bytes[i]);
        }
        return bytesConverted;
    }

    public byte convert(byte b) {
        int i = b & 0x00ff;
        return convertToTable[i];
    }

    public byte[] convert(char[] chars) {
        return convert(chars, 0, chars.length);
    }

    public byte[] convert(char[] chars, int offset, int length) {
        if ((offset < 0) || (length < 0) || ((offset + length) > chars.length)) {
            throw new ArrayIndexOutOfBoundsException();
        }
        byte[] bytesConverted = new byte[length];

        for (int i = offset, j = 0; j < length; i++, j++) {
            bytesConverted[j] = convert(chars[i]);
        }
        return bytesConverted;
    }

    public byte convert(char c) {
        int i = ((byte) c) & 0x00ff;
        return convertToTable[i];
    }

    public ByteArray convert(ByteArray byteArray) {
        return convert(byteArray, 0, byteArray.getLength());
    }

    public ByteArray convert(ByteArray byteArray, int offset, int length) {
        byte[] bytesConverted;
        if (byteArray.hasArray()) {
            ByteArray.UnderlyingArray array = byteArray.getArray();
            bytesConverted = convert(array.value, offset + array.offset,
                    length);
        } else {
            bytesConverted = convert(byteArray.getBytes(), offset,
                    length);
        }
        return new ByteArray(bytesConverted, outputEncoding());
    }
}