/*
 * $Id$
 *
 * Copyright (C) 2003-2015 JNode.org
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; If not, write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package org.jnode.awt.font.truetype;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.URL;

/**
 * Concrete implementation of the TrueType Font, read from a TTF File.
 *
 * @author Mark Donszelmann
 * @version $Id$
 */
public class TTFFontDataFile extends TTFFontData {

    private static final String mode = "r";

    private String fileName;
    private TTFInput ttf;

    private int sfntMajorVersion;
    private int sfntMinorVersion;
    private int numberOfTables;
    private int searchRange;
    private int entrySelector;
    private int rangeShift;

    public TTFFontDataFile(String name) throws FileNotFoundException, IOException {
        this(new TTFFileInput(new RandomAccessFile(name, mode)));
        fileName = name;
    }

    public TTFFontDataFile(byte[] data) throws IOException {
        this(new TTFMemoryInput(data));
    }

    public TTFFontDataFile(URL url) throws IOException {
        this(new TTFMemoryInput(url));
    }

    public TTFFontDataFile(TTFInput input) throws IOException {
        ttf = input;

        // read table directory
        ttf.seek(0);

        // read the version : 0x00010000 for version 1.0.
        sfntMajorVersion = ttf.readUShort();
        sfntMinorVersion = ttf.readUShort();
        // read the number of tables
        numberOfTables = ttf.readUShort();

        //(Maximum power of 2 <= numTables) x 16.
        searchRange = ttf.readUShort();
        //Log2(maximum power of 2 <= numTables).
        entrySelector = ttf.readUShort();
        //NumTables x 16-searchRange.
        rangeShift = ttf.readUShort();

        // This is followed at byte 12 by the Table Directory entries.
        // Entries in the Table Directory must be sorted in ascending
        // order by tag.

        // read table entries
        for (int i = 0; i < numberOfTables; i++) {
            ttf.seek(12 + i * 16);
            // read TAG  = 4 \u2013byte identifier.
            byte b[] = new byte[4];
            ttf.readFully(b);
            String tag = new String(b);
            // read CheckSum for this table.
            ttf.readLong();
            // read Offset from beginning of TrueType font file.
            int offset = ttf.readLong();
            //read Length of this table.
            int len = ttf.readLong();
            // create a table directoryEntry entry
            TTFInput tableInput = ttf.createSubInput(offset, len);
            // insert this table as a new table
            final TableClass tc = TableClass.getByTag(tag);
            if (tc != null) {
                newTable(tc, tableInput);
            }
        }
        readAll();
    }

    public int getFontVersion() {
        return sfntMajorVersion;
    }

    public void close() throws IOException {
        super.close();
        ttf.close();
    }

    public void show() {
        super.show();

        System.out.println("Font: " + fileName);
        System.out.println("  sfnt: " + sfntMajorVersion + "." + sfntMinorVersion);
        System.out.println("  numTables: " + numberOfTables);
        System.out.println("  searchRange: " + searchRange);
        System.out.println("  entrySelector: " + entrySelector);
        System.out.println("  rangeShift: " + rangeShift);
    }
}