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 027import org.apache.commons.imaging.common.Allocator; 028 029public final class SosSegment extends AbstractSegment { 030 031 public static class Component { 032 static final int SHALLOW_SIZE = 24; 033 public final int scanComponentSelector; 034 public final int dcCodingTableSelector; 035 public final int acCodingTableSelector; 036 037 public Component(final int scanComponentSelector, final int dcCodingTableSelector, final int acCodingTableSelector) { 038 this.scanComponentSelector = scanComponentSelector; 039 this.dcCodingTableSelector = dcCodingTableSelector; 040 this.acCodingTableSelector = acCodingTableSelector; 041 } 042 } 043 044 private static final Logger LOGGER = Logger.getLogger(SosSegment.class.getName()); 045 public final int numberOfComponents; 046 private final Component[] components; 047 public final int startOfSpectralSelection; 048 public final int endOfSpectralSelection; 049 public final int successiveApproximationBitHigh; 050 051 public final int successiveApproximationBitLow; 052 053 public SosSegment(final int marker, final byte[] segmentData) throws IOException { 054 this(marker, segmentData.length, new ByteArrayInputStream(segmentData)); 055 } 056 057 public SosSegment(final int marker, final int markerLength, final InputStream is) throws IOException { 058 super(marker, markerLength); 059 060 if (LOGGER.isLoggable(Level.FINEST)) { 061 LOGGER.finest("SosSegment markerLength: " + markerLength); 062 } 063 064 // Debug.debug("SOS", marker_length); 065 066 numberOfComponents = readByte("numberOfComponents", is, "Not a Valid JPEG File"); 067 // Debug.debug("number_of_components_in_scan", 068 // numberOfComponents); 069 070 components = Allocator.array(numberOfComponents, Component[]::new, Component.SHALLOW_SIZE); 071 for (int i = 0; i < numberOfComponents; i++) { 072 final int scanComponentSelector = readByte("scanComponentSelector", is, "Not a Valid JPEG File"); 073 // Debug.debug("scanComponentSelector", scanComponentSelector); 074 075 final int acDcEntropyCodingTableSelector = readByte("acDcEntropyCodingTableSelector", is, "Not a Valid JPEG File"); 076 // Debug.debug("ac_dc_entrooy_coding_table_selector", 077 // acDcEntropyCodingTableSelector); 078 079 final int dcCodingTableSelector = acDcEntropyCodingTableSelector >> 4 & 0xf; 080 final int acCodingTableSelector = acDcEntropyCodingTableSelector & 0xf; 081 components[i] = new Component(scanComponentSelector, dcCodingTableSelector, acCodingTableSelector); 082 } 083 084 startOfSpectralSelection = readByte("startOfSpectralSelection", is, "Not a Valid JPEG File"); 085 // Debug.debug("start_of_spectral_selection", startOfSpectralSelection); 086 endOfSpectralSelection = readByte("endOfSpectralSelection", is, "Not a Valid JPEG File"); 087 // Debug.debug("end_of_spectral_selection", endOfSpectralSelection); 088 final int successiveApproximationBitPosition = readByte("successiveApproximationBitPosition", is, "Not a Valid JPEG File"); 089 // Debug.debug("successive_approximation_bit_position", 090 // successive_approximation_bit_position); 091 successiveApproximationBitHigh = successiveApproximationBitPosition >> 4 & 0xf; 092 successiveApproximationBitLow = successiveApproximationBitPosition & 0xf; 093 } 094 095 /** 096 * Returns a copy of all the components. 097 * 098 * @return all the components 099 */ 100 public Component[] getComponents() { 101 return components.clone(); 102 } 103 104 /** 105 * Gets a component at the specified index. 106 * 107 * @param index the component index 108 * @return the component 109 */ 110 public Component getComponents(final int index) { 111 return components[index]; 112 } 113 114 @Override 115 public String getDescription() { 116 return "SOS (" + getSegmentType() + ")"; 117 } 118 119}