com.itextpdf.io.source.ArrayRandomAccessSource Maven / Gradle / Ivy

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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.io.source;


import com.itextpdf.io.exceptions.IoExceptionMessageConstant;

/**
 * A RandomAccessSource that is based on an underlying byte array
 */
class ArrayRandomAccessSource implements IRandomAccessSource {


    private byte[] array;

    public ArrayRandomAccessSource(byte[] array) {
        if(array == null) {
            throw new IllegalArgumentException("Passed byte array can not be null.");
        }
        this.array = array;
    }

    public int get(long offset) {
        if (array == null) {
            throw new IllegalStateException(IoExceptionMessageConstant.ALREADY_CLOSED);
        }
        if (offset >= array.length) {
            return -1;
        }
        return 0xff & array[(int)offset];
    }

    public int get(long offset, byte[] bytes, int off, int len) {
        if (array == null) {
            throw new IllegalStateException(IoExceptionMessageConstant.ALREADY_CLOSED);
        }
        if (offset >= array.length) {
            return -1;
        }
        if (offset + len > array.length) {
            len = (int)(array.length - offset);
        }
        System.arraycopy(array, (int)offset, bytes, off, len);

        return len;
    }

    public long length() {
        if (array == null) {
            throw new IllegalStateException(IoExceptionMessageConstant.ALREADY_CLOSED);
        }
        return array.length;
    }

    public void close() throws java.io.IOException {
        array = null;
    }
}