/*
* 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.tom_roush.fontbox.cff;
import java.io.ByteArrayOutputStream;
import java.util.List;
/**
* This class represents a formatter for CharString commands of a Type1 font.
* @author Villu Ruusmann
* @version $Revision: 1.0 $
*/
public class Type1CharStringFormatter
{
private ByteArrayOutputStream output = null;
/**
* Formats the given command sequence to a byte array.
* @param sequence the given command sequence
* @return the formatted seuqence as byte array
*/
public byte[] format(List<Object> sequence)
{
output = new ByteArrayOutputStream();
for (Object object : sequence)
{
if (object instanceof CharStringCommand)
{
writeCommand((CharStringCommand) object);
}
else if (object instanceof Integer)
{
writeNumber((Integer) object);
}
else
{
throw new IllegalArgumentException();
}
}
return output.toByteArray();
}
private void writeCommand(CharStringCommand command)
{
int[] value = command.getKey().getValue();
for (int i = 0; i < value.length; i++)
{
output.write(value[i]);
}
}
private void writeNumber(Integer number)
{
int value = number.intValue();
if (value >= -107 && value <= 107)
{
output.write(value + 139);
}
else if (value >= 108 && value <= 1131)
{
int b1 = (value - 108) % 256;
int b0 = (value - 108 - b1) / 256 + 247;
output.write(b0);
output.write(b1);
}
else if (value >= -1131 && value <= -108)
{
int b1 = -((value + 108) % 256);
int b0 = -((value + 108 + b1) / 256 - 251);
output.write(b0);
output.write(b1);
}
else
{
int b1 = value >>> 24 & 0xff;
int b2 = value >>> 16 & 0xff;
int b3 = value >>> 8 & 0xff;
int b4 = value >>> 0 & 0xff;
output.write(255);
output.write(b1);
output.write(b2);
output.write(b3);
output.write(b4);
}
}
}