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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
/*
* 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.commons.imaging.formats.jpeg.segments;
import java.io.PrintWriter;
import org.apache.commons.imaging.common.BinaryFileParser;
public abstract class Segment extends BinaryFileParser {
public final int marker;
public final int length;
public Segment(final int marker, final int length) {
// super();
this.marker = marker;
this.length = length;
}
public void dump(final PrintWriter pw) {
// empty
}
public abstract String getDescription();
@Override
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";
}
}