001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.imaging.formats.jpeg.segments; 018 019import static org.apache.commons.imaging.common.BinaryFunctions.readByte; 020 021import java.io.ByteArrayInputStream; 022import java.io.IOException; 023import java.io.InputStream; 024import java.util.logging.Level; 025import java.util.logging.Logger; 026 027public class SosSegment extends Segment { 028 029 private static final Logger LOGGER = Logger.getLogger(SosSegment.class.getName()); 030 031 public final int numberOfComponents; 032 private final Component[] components; 033 public final int startOfSpectralSelection; 034 public final int endOfSpectralSelection; 035 public final int successiveApproximationBitHigh; 036 public final int successiveApproximationBitLow; 037 038 public static class Component { 039 public final int scanComponentSelector; 040 public final int dcCodingTableSelector; 041 public final int acCodingTableSelector; 042 043 public Component(final int scanComponentSelector, final int dcCodingTableSelector, 044 final int acCodingTableSelector) { 045 this.scanComponentSelector = scanComponentSelector; 046 this.dcCodingTableSelector = dcCodingTableSelector; 047 this.acCodingTableSelector = acCodingTableSelector; 048 } 049 } 050 051 public SosSegment(final int marker, final byte[] segmentData) throws IOException { 052 this(marker, segmentData.length, new ByteArrayInputStream(segmentData)); 053 } 054 055 public SosSegment(final int marker, final int markerLength, final InputStream is) throws IOException { 056 super(marker, markerLength); 057 058 if (LOGGER.isLoggable(Level.FINEST)) { 059 LOGGER.finest("SosSegment marker_length: " + markerLength); 060 } 061 062 // Debug.debug("SOS", marker_length); 063 064 numberOfComponents = readByte("number_of_components_in_scan", is, 065 "Not a Valid JPEG File"); 066 // Debug.debug("number_of_components_in_scan", 067 // numberOfComponents); 068 069 components = new Component[numberOfComponents]; 070 for (int i = 0; i < numberOfComponents; i++) { 071 final int scanComponentSelector = readByte("scanComponentSelector", is, "Not a Valid JPEG File"); 072 // Debug.debug("scanComponentSelector", scanComponentSelector); 073 074 final int acDcEntropoyCodingTableSelector = readByte( 075 "acDcEntropoyCodingTableSelector", is, 076 "Not a Valid JPEG File"); 077 // Debug.debug("ac_dc_entrooy_coding_table_selector", 078 // acDcEntropoyCodingTableSelector); 079 080 final int dcCodingTableSelector = (acDcEntropoyCodingTableSelector >> 4) & 0xf; 081 final int acCodingTableSelector = acDcEntropoyCodingTableSelector & 0xf; 082 components[i] = new Component(scanComponentSelector, 083 dcCodingTableSelector, acCodingTableSelector); 084 } 085 086 startOfSpectralSelection = readByte("start_of_spectral_selection", is, 087 "Not a Valid JPEG File"); 088 // Debug.debug("start_of_spectral_selection", startOfSpectralSelection); 089 endOfSpectralSelection = readByte("end_of_spectral_selection", is, 090 "Not a Valid JPEG File"); 091 // Debug.debug("end_of_spectral_selection", endOfSpectralSelection); 092 final int successiveApproximationBitPosition = readByte( 093 "successive_approximation_bit_position", is, 094 "Not a Valid JPEG File"); 095 // Debug.debug("successive_approximation_bit_position", 096 // successive_approximation_bit_position); 097 successiveApproximationBitHigh = (successiveApproximationBitPosition >> 4) & 0xf; 098 successiveApproximationBitLow = successiveApproximationBitPosition & 0xf; 099 } 100 101 /** 102 * Returns a copy of all the components. 103 * @return all the components 104 */ 105 public Component[] getComponents() { 106 return components.clone(); 107 } 108 109 /** 110 * Return a component at the specified index. 111 * @param index the component index 112 * @return the component 113 */ 114 public Component getComponents(final int index) { 115 return components[index]; 116 } 117 118 @Override 119 public String getDescription() { 120 return "SOS (" + getSegmentType() + ")"; 121 } 122 123}