/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache POI", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.poi.hwpf.model.hdftypes;

import org.apache.poi.util.BitField;
import org.apache.poi.util.LittleEndian;

/**
 * FFN - Font Family Name. FFN is a data structure that stores the names of the Main 
 * Font and that of Alternate font as an array of characters. It has also a header
 * that stores info about the whole structure and the fonts
 *  
 * @author Praveen Mathew
 */
public class Ffn
{
  private int field1_cbFfnM1;//total length of FFN - 1.
  private byte field2;
    private  static BitField _prq = new BitField(0x0003);// pitch request
    private  static BitField _fTrueType = new BitField(0x0004);// when 1, font is a TrueType font
    private  static BitField _ff = new BitField(0x0070);
  private short field3_wWeight;// base weight of font
  private byte field4_chs;// character set identifier
  private byte field5_ixchSzAlt;  // index into ffn.szFfn to the name of
                                  // the alternate font
  private byte [] panose = new byte[10];//????
  private byte [] fontSig         = new byte[24];//????

  // zero terminated string that records name of font, cuurently not
  // supporting Extended chars
  private char [] xszFfn;
  private int xszFfnLength;

  public Ffn(byte[] buf, int offset)
  {
    field1_cbFfnM1 = LittleEndian.getUnsignedByte(buf,offset);
    offset += LittleEndian.BYTE_SIZE;
    field2 = buf[offset];
    offset += LittleEndian.BYTE_SIZE;
    field3_wWeight = LittleEndian.getShort(buf, offset);
    offset += LittleEndian.SHORT_SIZE;
    field4_chs = buf[offset];
    offset += LittleEndian.BYTE_SIZE;
    field5_ixchSzAlt = buf[offset];
    offset += LittleEndian.BYTE_SIZE;

    // read panose and fs so we can write them back out.
    System.arraycopy(buf, offset, panose, 0, panose.length);
    offset += panose.length;
    System.arraycopy(buf, offset, fontSig, 0, fontSig.length);
    offset += fontSig.length;

    xszFfnLength = this.getSize() - offset;
    xszFfn = new char[xszFfnLength];

    for(int i = 0; i < xszFfnLength; i++)
    {
      xszFfn[i] = (char)LittleEndian.getUnsignedByte(buf, offset);
      offset += LittleEndian.BYTE_SIZE;
    }


  }

  public int getField1_cbFfnM1()
  {
    return  field1_cbFfnM1;
  }

  public int getSize()
  {
    return (field1_cbFfnM1 + 1);
  }

  public char [] getMainFontName()
  {
    char [] temp = new char[field5_ixchSzAlt];
    System.arraycopy(xszFfn,0,temp,0,temp.length);
    return temp;
  }

  public char [] getAltFontName()
  {
    char [] temp = new char[xszFfnLength - field5_ixchSzAlt];
    System.arraycopy(xszFfn, field5_ixchSzAlt, temp, 0, temp.length);
    return temp;
  }

  public void setField1_cbFfnM1(int field1_cbFfnM1)
  {
    this.field1_cbFfnM1 = field1_cbFfnM1;
  }

  // changed protected to public
  public byte[] toByteArray()
  {
	int offset = 0;
	byte[] buf = new byte[this.getSize()];
	
	buf[offset] = (byte)field1_cbFfnM1;
	offset += LittleEndian.BYTE_SIZE;
	buf[offset] = field2;
	offset += LittleEndian.BYTE_SIZE;
	LittleEndian.putShort(buf, offset, field3_wWeight);
	offset += LittleEndian.SHORT_SIZE;
	buf[offset] = field4_chs;
	offset += LittleEndian.BYTE_SIZE;
	buf[offset] = field5_ixchSzAlt;
	offset += LittleEndian.BYTE_SIZE;
	
	System.arraycopy(panose,0,buf, offset,panose.length);
	offset += panose.length;
	System.arraycopy(fontSig,0,buf, offset, fontSig.length);
	offset += fontSig.length;
	
	for(int i = 0; i < xszFfn.length; i++)
	{
		buf[offset] = (byte)xszFfn[i];	  
	  	offset += LittleEndian.BYTE_SIZE;
	}
  	
    return buf;
     
  }


}