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HSQLDB - Lightweight 100% Java SQL Database Engine
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/* Copyright (c) 2001-2019, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
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 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.rowio;

import org.hsqldb.Row;
import org.hsqldb.persist.Crypto;
import org.hsqldb.types.Type;

/**
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.0.1
 * @since 1.9.0
 */
public class RowOutputBinaryEncode extends RowOutputBinary {

    final Crypto crypto;

    public RowOutputBinaryEncode(Crypto crypto, int initialSize, int scale) {

        super(initialSize, scale);

        this.crypto = crypto;
    }

    public void writeData(Row row, Type[] types) {

        if (crypto == null) {
            super.writeData(row, types);
        } else {
            int start = count;

            ensureRoom(row.getStorageSize());
            writeInt(0);
            super.writeData(row, types);

            int origLength = count - start - INT_STORE_SIZE;
            int newLength = crypto.encode(buffer, start + INT_STORE_SIZE,
                                          origLength, buffer,
                                          start + INT_STORE_SIZE);

            writeIntData(newLength, start);

            count = start + INT_STORE_SIZE + newLength;
        }
    }

    /**
     *  Calculate the size of byte array required to store a row.
     *
     * @param  row - a database row
     * @return  size of byte array
     */
    public int getSize(Row row) {

        int size = super.getSize(row);

        if (crypto != null) {
            size = crypto.getEncodedSize(size - INT_STORE_SIZE)
                   + INT_STORE_SIZE * 2;
        }

        return size;
    }

    public RowOutputInterface duplicate() {
        return new RowOutputBinaryEncode(crypto, 128, this.scale);
    }
}