itextpdf-master/itext/src/main/java/com/itextpdf/text/pdf/EnumerateTTC.java
/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2022 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.
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 * serving PDFs on the fly in a web application, shipping iText with a closed
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 */
package com.itextpdf.text.pdf;

import java.io.IOException;
import java.util.HashMap;

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.error_messages.MessageLocalization;
/** Enumerates all the fonts inside a True Type Collection.
 *
 * @author  Paulo Soares
 */
class EnumerateTTC extends TrueTypeFont{

    protected String[] names;

    EnumerateTTC(String ttcFile) throws DocumentException, IOException {
        fileName = ttcFile;
        rf = new RandomAccessFileOrArray(ttcFile);
        findNames();
    }

    EnumerateTTC(byte ttcArray[]) throws DocumentException, IOException {
        fileName = "Byte array TTC";
        rf = new RandomAccessFileOrArray(ttcArray);
        findNames();
    }

    void findNames() throws DocumentException, IOException {
        tables = new HashMap<String, int[]>();

        try {
            String mainTag = readStandardString(4);
            if (!mainTag.equals("ttcf"))
                throw new DocumentException(MessageLocalization.getComposedMessage("1.is.not.a.valid.ttc.file", fileName));
            rf.skipBytes(4);
            int dirCount = rf.readInt();
            names = new String[dirCount];
            int dirPos = (int)rf.getFilePointer();
            for (int dirIdx = 0; dirIdx < dirCount; ++dirIdx) {
                tables.clear();
                rf.seek(dirPos);
                rf.skipBytes(dirIdx * 4);
                directoryOffset = rf.readInt();
                rf.seek(directoryOffset);
                if (rf.readInt() != 0x00010000)
                    throw new DocumentException(MessageLocalization.getComposedMessage("1.is.not.a.valid.ttf.file", fileName));
                int num_tables = rf.readUnsignedShort();
                rf.skipBytes(6);
                for (int k = 0; k < num_tables; ++k) {
                    String tag = readStandardString(4);
                    rf.skipBytes(4);
                    int table_location[] = new int[2];
                    table_location[0] = rf.readInt();
                    table_location[1] = rf.readInt();
                    tables.put(tag, table_location);
                }
                names[dirIdx] = getBaseFont();
            }
        }
        finally {
            if (rf != null)
                rf.close();
        }
    }

    String[] getNames() {
        return names;
    }

}
