/*
* 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 org.apache.sanselan.formats.jpeg.segments;
import java.io.PrintWriter;
import org.apache.sanselan.common.BinaryFileParser;
public abstract class Segment extends BinaryFileParser
{
public final int marker;
public final int length;
public Segment(int marker, int length)
{
// super();
this.marker = marker;
this.length = length;
}
public void dump(PrintWriter pw)
{
}
public abstract String getDescription();
public String toString()
{
return "[Segment: " + getDescription() + "]";
}
public String getSegmentType()
{
switch (marker)
{
case 0xffc0 :
return "Start Of Frame, Baseline DCT, Huffman coding";
case 0xffc1 :
return "Start Of Frame, Extended sequential DCT, Huffman coding";
case 0xffc2 :
return "Start Of Frame, Progressive DCT, Huffman coding";
case 0xffc3 :
return "Start Of Frame, Lossless (sequential), Huffman coding";
case 0xffc5 :
return "Start Of Frame, Differential sequential DCT, Huffman coding";
case 0xffc6 :
return "Start Of Frame, Differential progressive DCT, Huffman coding";
case 0xffc7 :
return "Start Of Frame, Differential lossless (sequential), Huffman coding";
case 0xffc8 :
return "Start Of Frame, Reserved for JPEG extensions, arithmetic coding";
case 0xffc9 :
return "Start Of Frame, Extended sequential DCT, arithmetic coding";
case 0xffca :
return "Start Of Frame, Progressive DCT, arithmetic coding";
case 0xffcb :
return "Start Of Frame, Lossless (sequential), arithmetic coding";
case 0xffcd :
return "Start Of Frame, Differential sequential DCT, arithmetic coding";
case 0xffce :
return "Start Of Frame, Differential progressive DCT, arithmetic coding";
case 0xffcf :
return "Start Of Frame, Differential lossless (sequential), arithmetic coding";
case 0xffc4 :
return "Define Huffman table(s)";
case 0xffcc :
return "Define arithmetic coding conditioning(s)";
case 0xffd0 :
return "Restart with modulo 8 count 0";
case 0xffd1 :
return "Restart with modulo 8 count 1";
case 0xffd2 :
return "Restart with modulo 8 count 2";
case 0xffd3 :
return "Restart with modulo 8 count 3";
case 0xffd4 :
return "Restart with modulo 8 count 4";
case 0xffd5 :
return "Restart with modulo 8 count 5";
case 0xffd6 :
return "Restart with modulo 8 count 6";
case 0xffd7 :
return "Restart with modulo 8 count 7";
case 0xffd8 :
return "Start of image";
case 0xffd9 :
return "End of image";
case 0xffda :
return "Start of scan";
case 0xffdb :
return "Define quantization table(s)";
case 0xffdc :
return "Define number of lines";
case 0xffdd :
return "Define restart interval";
case 0xffde :
return "Define hierarchical progression";
case 0xffdf :
return "Expand reference component(s)";
// case 0xffd8 :
// return "Reserved for application segments";
// case 0xffd8 :
// return "Reserved for JPEG extensions";
case 0xfffe :
return "Comment";
case 0xff01 :
return "For temporary private use in arithmetic coding";
// case 0xffd8 :
// return "Reserved";
default :
}
if ((marker >= 0xff02) && (marker <= 0xffbf))
return "Reserved";
if ((marker >= 0xffe0) && (marker <= 0xffef))
return "APP" + (marker - 0xffe0);
if ((marker >= 0xfff0) && (marker <= 0xfffd))
return "JPG" + (marker - 0xffe0);
return "Unknown";
}
}