/*
    * 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.png.chunks;
  
  import static org.apache.commons.imaging.common.BinaryFunctions.read4Bytes;
  import static org.apache.commons.imaging.common.BinaryFunctions.readByte;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.formats.png.InterlaceMethod;
  import org.apache.commons.imaging.formats.png.PngColorType;
  
  public class PngChunkIhdr extends PngChunk {
  
      private final int width;
      private final int height;
      private final int bitDepth;
      private final PngColorType pngColorType;
      private final int compressionMethod;
      private final int filterMethod;
      private final InterlaceMethod interlaceMethod;
  
      public PngChunkIhdr(final int length, final int chunkType, final int crc, final byte[] bytes) throws ImagingException, IOException {
          super(length, chunkType, crc, bytes);
  
          final ByteArrayInputStream is = new ByteArrayInputStream(bytes);
          width = read4Bytes("Width", is, "Not a Valid PNG File: IHDR Corrupt", getByteOrder());
          height = read4Bytes("Height", is, "Not a Valid PNG File: IHDR Corrupt", getByteOrder());
          bitDepth = readByte("BitDepth", is, "Not a Valid PNG File: IHDR Corrupt");
          final int type = readByte("ColorType", is, "Not a Valid PNG File: IHDR Corrupt");
          pngColorType = PngColorType.getColorType(type);
          if (getPngColorType() == null) {
              throw new ImagingException("PNG: unknown color type: " + type);
          }
          compressionMethod = readByte("CompressionMethod", is, "Not a Valid PNG File: IHDR Corrupt");
          filterMethod = readByte("FilterMethod", is, "Not a Valid PNG File: IHDR Corrupt");
          final int method = readByte("InterlaceMethod", is, "Not a Valid PNG File: IHDR Corrupt");
          if (method < 0 || method >= InterlaceMethod.values().length) {
              throw new ImagingException("PNG: unknown interlace method: " + method);
          }
          interlaceMethod = InterlaceMethod.values()[method];
      }
  
      public int getBitDepth() {
          return bitDepth;
      }
  
      public int getCompressionMethod() {
          return compressionMethod;
      }
  
      public int getFilterMethod() {
          return filterMethod;
      }
  
      public int getHeight() {
          return height;
      }
  
      public InterlaceMethod getInterlaceMethod() {
          return interlaceMethod;
      }
  
      public PngColorType getPngColorType() {
          return pngColorType;
      }
  
      public int getWidth() {
          return width;
      }
  }