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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
package org.openoffice.xmerge.converter.xml.sxw.wordsmith;
/**
* <p>This class represents a font table in a WordSmith document.
* A font table is represented as follows:</p>
*
* <p><blockquote>
* binary "3"<br>
* two-byte length of the table of strings which follows<br>
* string table (null-terminated strings) representing font names
* </blockquote></p>
*
* @author David Proulx
*/
class WseFontTable extends Wse {
java.util.ArrayList<String> fontNames = new java.util.ArrayList<String>(10);
/**
* Constructor for use when going from DOM to WordSmith.
*/
public WseFontTable() {
}
/**
* Constructor for use when going from WordSmith to DOM.
*
* @param dataArray <code>byte</code> array.
* @param i The index.
*/
public WseFontTable(byte dataArray[], int i) {
i++;
int tableLen = ((dataArray[i] << 8) | (dataArray[i+1] & 0xFF));
i += 2;
while (tableLen > 0) {
int j = 0;
while (dataArray[i + j] != 0) j++;
fontNames.add(new String(dataArray, i, j));
tableLen -= (j + 1);
i += (j + 1);
}
}
/**
* Add a new font to the table.
*
* @param newFontName The new font name.
*/
public void add(String newFontName) {
if (newFontName != null)
fontNames.add(newFontName);
}
/**
* Return a font name from the table, or null if invalid index.
*
* @param index The font name index.
*
* @return The font name.
*/
public String getFontName(int index) {
try {
return fontNames.get(index);
} catch (ArrayIndexOutOfBoundsException e) {
return null;
}
}
/**
* Return the index of a font name in the table, or -1 if not found.
*
* @param fontName The font name.
*
* @return The index of the font name, or -1 if not found.
*/
public int getFontIndex(String fontName) {
int len = fontNames.size();
for (int i = 0; i < len; i++) {
String name = fontNames.get(i);
if (name.equals(fontName))
return i;
}
return -1;
}
/**
* Compute the index of the first <code>byte</code> following the
* paragraph descriptor, assuming that
* <code>dataArray[startIndex]</code> is the beginning of a valid
* paragraph descriptor.
*
* @param dataArray <code>byte</code> array.
* @param startIndex The start index.
*
* @return The index of the first <code>byte</code> following the
* paragraph description.
*/
static int computeNewIndex(byte dataArray[], int startIndex) {
startIndex++; // Skip the leading "3"
int tableLen = ((dataArray[startIndex] << 8) | (dataArray[startIndex+1] & 0xFF));
tableLen &= 0xFFFF; // eliminate problems with sign-extension
return startIndex + tableLen + 2;
}
/**
* Return true if <code>dataArray[startIndex]</code> is the start of a
* valid paragraph descriptor.
*
* @param dataArray <code>byte</code> string.
* @param startIndex Start index.
*
* @return true if <code>dataArray[startIndex]</code> is the start
* of a valid paragraph descriptor, false otherwise.
*/
static boolean isValid(byte dataArray[], int startIndex) {
try {
if (dataArray[startIndex] != 3)
return false;
int len = ((dataArray[startIndex+1] << 8)
| (dataArray[startIndex+2] & 0xFF));
len &= 0xFFFF; // eliminate problems with sign-extension
if (dataArray[startIndex + len + 2] != 0)
return false;
} catch (ArrayIndexOutOfBoundsException e) {
return false;
}
return true;
}
/**
* Return the number of bytes needed to represent this font table.
*
* @return The number of bytes needed to represent this font table.
*/
int getByteCount() {
int length = 3; // leading "3" plus 2 bytes for length.
int nFonts = fontNames.size();
for (int i = 0; i < nFonts; i++) {
String name = fontNames.get(i);
length += name.length() + 1; // extra byte is for trailing "0"
}
return length;
}
/**
* Return a <code>byte</code> array representing this font table.
*
* @return An <code>byte</code> array representing this font table.
*/
byte[] getBytes() {
int length = getByteCount();
int nFonts = fontNames.size();
byte b[] = new byte[length];
b[0] = 3;
length -= 3;
b[1] = (byte)(length >> 8);
b[2] = (byte)(length & 0xFF);
int indx = 3;
for (int i = 0; i < nFonts; i++) {
String name = fontNames.get(i);
byte bname[] = name.getBytes();
System.arraycopy(bname, 0, b, indx, bname.length);
indx += bname.length;
b[indx++] = 0;
}
return b;
}
}
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