    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
    025public final class PngChunkPhys extends PngChunk {
    026
    027    private final int pixelsPerUnitXAxis;
    028    private final int pixelsPerUnitYAxis;
    029    private final int unitSpecifier;
    030
    031    public PngChunkPhys(final int length, final int chunkType, final int crc, final byte[] bytes) throws IOException {
    032        super(length, chunkType, crc, bytes);
    033        final ByteArrayInputStream is = new ByteArrayInputStream(bytes);
    034        pixelsPerUnitXAxis = read4Bytes("PixelsPerUnitXAxis", is, "Not a Valid PNG File: pHYs Corrupt", getByteOrder());
    035        pixelsPerUnitYAxis = read4Bytes("PixelsPerUnitYAxis", is, "Not a Valid PNG File: pHYs Corrupt", getByteOrder());
    036        unitSpecifier = readByte("Unit specifier", is, "Not a Valid PNG File: pHYs Corrupt");
    037    }
    038
    039    public int getPixelsPerUnitXAxis() {
    040        return pixelsPerUnitXAxis;
    041    }
    042
    043    public int getPixelsPerUnitYAxis() {
    044        return pixelsPerUnitYAxis;
    045    }
    046
    047    public int getUnitSpecifier() {
    048        return unitSpecifier;
    049    }
    050
    051}