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.png.chunks; 018 019import static org.apache.commons.imaging.common.BinaryFunctions.read4Bytes; 020import static org.apache.commons.imaging.common.BinaryFunctions.readByte; 021 022import java.io.ByteArrayInputStream; 023import java.io.IOException; 024 025import org.apache.commons.imaging.ImagingException; 026import org.apache.commons.imaging.formats.png.InterlaceMethod; 027import org.apache.commons.imaging.formats.png.PngColorType; 028 029public final class PngChunkIhdr extends PngChunk { 030 031 private final int width; 032 private final int height; 033 private final int bitDepth; 034 private final PngColorType pngColorType; 035 private final int compressionMethod; 036 private final int filterMethod; 037 private final InterlaceMethod interlaceMethod; 038 039 public PngChunkIhdr(final int length, final int chunkType, final int crc, final byte[] bytes) throws ImagingException, IOException { 040 super(length, chunkType, crc, bytes); 041 042 final ByteArrayInputStream is = new ByteArrayInputStream(bytes); 043 width = read4Bytes("Width", is, "Not a Valid PNG File: IHDR Corrupt", getByteOrder()); 044 height = read4Bytes("Height", is, "Not a Valid PNG File: IHDR Corrupt", getByteOrder()); 045 bitDepth = readByte("BitDepth", is, "Not a Valid PNG File: IHDR Corrupt"); 046 final int type = readByte("ColorType", is, "Not a Valid PNG File: IHDR Corrupt"); 047 pngColorType = PngColorType.getColorType(type); 048 if (getPngColorType() == null) { 049 throw new ImagingException("PNG: unknown color type: " + type); 050 } 051 compressionMethod = readByte("CompressionMethod", is, "Not a Valid PNG File: IHDR Corrupt"); 052 filterMethod = readByte("FilterMethod", is, "Not a Valid PNG File: IHDR Corrupt"); 053 final int method = readByte("InterlaceMethod", is, "Not a Valid PNG File: IHDR Corrupt"); 054 if (method < 0 || method >= InterlaceMethod.values().length) { 055 throw new ImagingException("PNG: unknown interlace method: " + method); 056 } 057 interlaceMethod = InterlaceMethod.values()[method]; 058 } 059 060 public int getBitDepth() { 061 return bitDepth; 062 } 063 064 public int getCompressionMethod() { 065 return compressionMethod; 066 } 067 068 public int getFilterMethod() { 069 return filterMethod; 070 } 071 072 public int getHeight() { 073 return height; 074 } 075 076 public InterlaceMethod getInterlaceMethod() { 077 return interlaceMethod; 078 } 079 080 public PngColorType getPngColorType() { 081 return pngColorType; 082 } 083 084 public int getWidth() { 085 return width; 086 } 087}