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Version modificada de iText 2.1.7 con el paquete cambiado, adaptaciones menores para firma y dependencias actualizadas.
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/*
 * Copyright 2002 Paulo Soares
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.aowagie.text.pdf;

import java.io.IOException;

import com.aowagie.text.ExceptionConverter;
/** Implements PDF functions.
 *
 * @author Paulo Soares ([email protected])
 */
class PdfFunction {

    private final PdfWriter writer;

    private PdfIndirectReference reference;

    private PdfDictionary dictionary;

    /** Creates new PdfFunction */
    private PdfFunction(final PdfWriter writer) {
        this.writer = writer;
    }

    PdfIndirectReference getReference() {
        try {
            if (this.reference == null) {
                this.reference = this.writer.addToBody(this.dictionary).getIndirectReference();
            }
        }
        catch (final IOException ioe) {
            throw new ExceptionConverter(ioe);
        }
        return this.reference;
    }



    static PdfFunction type2(final PdfWriter writer, final float domain[], final float range[], final float c0[], final float c1[], final float n) {
        final PdfFunction func = new PdfFunction(writer);
        func.dictionary = new PdfDictionary();
        func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(2));
        func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain));
        if (range != null) {
			func.dictionary.put(PdfName.RANGE, new PdfArray(range));
		}
        if (c0 != null) {
			func.dictionary.put(PdfName.C0, new PdfArray(c0));
		}
        if (c1 != null) {
			func.dictionary.put(PdfName.C1, new PdfArray(c1));
		}
        func.dictionary.put(PdfName.N, new PdfNumber(n));
        return func;
    }




}