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/*****************************************************************************
 * Copyright (C) The Apache Software Foundation. All rights reserved.        *
 * ------------------------------------------------------------------------- *
 * This software is published under the terms of the Apache Software License *
 * version 1.1, a copy of which has been included with this distribution in  *
 * the LICENSE file.                                                         *
 *****************************************************************************/

package jogamp.graph.font.typecast.ot.table;

import java.io.DataInput;
import java.io.IOException;

/**
 * @version $Id: LocaTable.java,v 1.4 2010-08-10 11:45:43 davidsch Exp $
 * @author David Schweinsberg
 */
public class LocaTable implements Table {

    private final DirectoryEntry _de;
    private int[] _offsets = null;
    private short _factor = 0;

    protected LocaTable(
            final DirectoryEntry de,
            final DataInput di,
            final HeadTable head,
            final MaxpTable maxp) throws IOException {
        _de = (DirectoryEntry) de.clone();
        _offsets = new int[maxp.getNumGlyphs() + 1];
        final boolean shortEntries = head.getIndexToLocFormat() == 0;
        if (shortEntries) {
            _factor = 2;
            for (int i = 0; i <= maxp.getNumGlyphs(); i++) {
                _offsets[i] = di.readUnsignedShort();
            }
        } else {
            _factor = 1;
            for (int i = 0; i <= maxp.getNumGlyphs(); i++) {
                _offsets[i] = di.readInt();
            }
        }
    }

    public int getOffset(final int i) {
        if (_offsets == null) {
            return 0;
        }
        return _offsets[i] * _factor;
    }

    @Override
    public int getType() {
        return loca;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append("'loca' Table - Index To Location Table\n--------------------------------------\n")
            .append("Size = ").append(_de.getLength()).append(" bytes, ")
            .append(_offsets.length).append(" entries\n");
        for (int i = 0; i < _offsets.length; i++) {
            sb.append("        Idx ").append(i)
                .append(" -> glyfOff 0x").append(getOffset(i)).append("\n");
        }
        return sb.toString();
    }

    /**
     * Get a directory entry for this table.  This uniquely identifies the
     * table in collections where there may be more than one instance of a
     * particular table.
     * @return A directory entry
     */
    @Override
    public DirectoryEntry getDirectoryEntry() {
        return _de;
    }
}