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;
018
019import java.nio.charset.StandardCharsets;
020
021import org.apache.commons.imaging.common.BinaryFunctions;
022
023/**
024 * Type of a PNG chunk.
025 *
026 * @see <a href="http://www.w3.org/TR/PNG/#11Chunks">Portable Network Graphics Specification - Chunk specifications</a>
027 */
028public enum ChunkType {
029
030    /** Image header */
031    IHDR,
032
033    /** Palette */
034    PLTE,
035
036    /** Image data */
037    IDAT,
038
039    /** Image trailer */
040    IEND,
041
042    /** Transparency */
043    tRNS,
044
045    /** Primary chromaticities and white point */
046    cHRM,
047
048    /** Image gamma */
049    gAMA,
050
051    /** Embedded ICC profile */
052    iCCP,
053
054    /** Significant bits*/
055    sBIT,
056
057    /** Standard RGB colour space */
058    sRGB,
059
060    /** Textual data */
061    tEXt,
062
063    /** Compressed textual data */
064    zTXt,
065
066    /** International textual data */
067    iTXt,
068
069    /** Background colour */
070    bKGD,
071
072    /** Image histogram */
073    hIST,
074
075    /** Physical pixel dimensions */
076    pHYs,
077
078    /** Physical scale */
079    sCAL,
080
081    /** Suggested palette */
082    sPLT,
083
084    /** Image last-modification time */
085    tIME;
086
087    final byte[] array;
088    final int value;
089
090    ChunkType() {
091        final char[] chars = name().toCharArray();
092        array = name().getBytes(StandardCharsets.UTF_8);
093        value = BinaryFunctions.charsToQuad(chars[0], chars[1], chars[2], chars[3]);
094    }
095}