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iText, a free Java-PDF library
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/*
 * $Id: CMapByteCid.java 6134 2013-12-23 13:15:14Z blowagie $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2014 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * 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 http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: [email protected]
 */
package com.itextpdf.text.pdf.fonts.cmaps;

import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.pdf.PdfNumber;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfString;
import java.util.ArrayList;

public class CMapByteCid extends AbstractCMap {
    private ArrayList planes = new ArrayList();

    public CMapByteCid() {
        planes.add(new char[256]);
    }
    
    @Override
    void addChar(PdfString mark, PdfObject code) {
        if (!(code instanceof PdfNumber))
            return;
        encodeSequence(decodeStringToByte(mark), (char)((PdfNumber)code).intValue());
    }
    
    private void encodeSequence(byte seqs[], char cid) {
        int size = seqs.length - 1;
        int nextPlane = 0;
        for (int idx = 0; idx < size; ++idx) {
            char plane[] = planes.get(nextPlane);
            int one = seqs[idx] & 0xff;
            char c = plane[one];
            if (c != 0 && (c & 0x8000) == 0)
                throw new RuntimeException(MessageLocalization.getComposedMessage("inconsistent.mapping"));
            if (c == 0) {
                planes.add(new char[256]);
                c = (char)(planes.size() - 1 | 0x8000);
                plane[one] = c;
            }
            nextPlane = c & 0x7fff;
        }
        char plane[] = planes.get(nextPlane);
        int one = seqs[size] & 0xff;
        char c = plane[one];
        if ((c & 0x8000) != 0)
            throw new RuntimeException(MessageLocalization.getComposedMessage("inconsistent.mapping"));
        plane[one] = cid;
    }
    
    /**
     * 
     * @param seq
     * @return the cid code or -1 for end
     */
    public int decodeSingle(CMapSequence seq) {
        int end = seq.off + seq.len;
        int currentPlane = 0;
        while (seq.off < end) {
            int one = seq.seq[seq.off++] & 0xff;
            --seq.len;
            char plane[] = planes.get(currentPlane);
            int cid = plane[one];
            if ((cid & 0x8000) == 0) {
                return cid;
            }
            else
                currentPlane = cid & 0x7fff;
        }
        return -1;
    }

    public String decodeSequence(CMapSequence seq) {
        StringBuilder sb = new StringBuilder();
        int cid = 0;
        while ((cid = decodeSingle(seq)) >= 0) {
            sb.append((char)cid);
        }
        return sb.toString();
    }
}