com.igormaznitsa.zxpoly.components.RomData.java Source code

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Here is the source code for com.igormaznitsa.zxpoly.components.RomData.java

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/*
 * Copyright (C) 2014 Raydac Research Group Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.igormaznitsa.zxpoly.components;

import com.igormaznitsa.jbbp.utils.JBBPUtils;
import java.io.*;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;

public final class RomData {

    private final byte[] data;
    private final int addressMask;

    public RomData(final byte[]... args) {
        int size = 0;
        for (final byte[] a : args) {
            size += a.length;
        }

        final byte[] result = new byte[size];
        int pos = 0;
        for (final byte[] a : args) {
            System.arraycopy(a, 0, result, pos, a.length);
            pos += a.length;
        }
        this.data = result;
        this.addressMask = JBBPUtils.makeMask(((size / 0x4000) * 0x4000) == size ? size - 1 : size);
    }

    public RomData(final byte[] array) {
        if (array.length > 0x10000) {
            throw new IllegalArgumentException("Rom data must not be greater than 64k");
        }

        final int size = ((array.length + 0x3FFF) / 0x4000) * 0x4000;
        this.data = new byte[size];
        this.addressMask = JBBPUtils.makeMask(size - 1);
        System.arraycopy(array, 0, this.data, 0, array.length);
    }

    public int getMask() {
        return this.addressMask;
    }

    public byte[] getAsArray() {
        return this.data;
    }

    public static RomData read(final File file) throws IOException {
        return new RomData(FileUtils.readFileToByteArray(file));
    }

    public static RomData read(final InputStream in) throws IOException {
        try {
            return new RomData(IOUtils.toByteArray(in));
        } finally {
            IOUtils.closeQuietly(in);
        }
    }

    public int readAdress(final int address) {
        return this.data[address & this.addressMask] & 0xFF;
    }

}