/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 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: sales@itextpdf.com
 */
package com.itextpdf.text.pdf;

import com.itextpdf.text.io.StreamUtil;
import com.itextpdf.text.pdf.fonts.FontsResourceAnchor;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.StringTokenizer;

public class GlyphList {
    private static HashMap<Integer, String> unicode2names = new HashMap<Integer, String>();
    private static HashMap<String, int[]> names2unicode = new HashMap<String, int[]>();

    static {
        InputStream is = null;
        try {
            is = StreamUtil.getResourceStream(BaseFont.RESOURCE_PATH + "glyphlist.txt", new FontsResourceAnchor().getClass().getClassLoader());
            if (is == null) {
                String msg = "glyphlist.txt not found as resource. (It must exist as resource in the package com.itextpdf.text.pdf.fonts)";
                throw new Exception(msg);
            }
            byte buf[] = new byte[1024];
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            while (true) {
                int size = is.read(buf);
                if (size < 0)
                    break;
                out.write(buf, 0, size);
            }
            is.close();
            is = null;
            String s = PdfEncodings.convertToString(out.toByteArray(), null);
            StringTokenizer tk = new StringTokenizer(s, "\r\n");
            while (tk.hasMoreTokens()) {
                String line = tk.nextToken();
                if (line.startsWith("#"))
                    continue;
                StringTokenizer t2 = new StringTokenizer(line, " ;\r\n\t\f");
                String name = null;
                String hex = null;
                if (!t2.hasMoreTokens())
                    continue;
                name = t2.nextToken();
                if (!t2.hasMoreTokens())
                    continue;
                hex = t2.nextToken();
                Integer num = Integer.valueOf(hex, 16);
                unicode2names.put(num, name);
                names2unicode.put(name, new int[]{num.intValue()});
            }
        }
        catch (Exception e) {
            System.err.println("glyphlist.txt loading error: " + e.getMessage());
        }
        finally {
            if (is != null) {
                try {
                    is.close();
                }
                catch (Exception e) {
                    // empty on purpose
                }
            }
        }
    }

    public static int[] nameToUnicode(String name) {
        int[] v = names2unicode.get(name);
        if (v == null && name.length() == 7 && name.toLowerCase().startsWith("uni")) {
            try {
                return new int[]{Integer.parseInt(name.substring(3), 16)};
            }
            catch (Exception ex) {
            }
        }
        return v;
    }

    public static String unicodeToName(int num) {
        return unicode2names.get(Integer.valueOf(num));
    }
}
