projects/dwt-win: dwt/internal/image/PngChunk.d annotate

annotate dwt/internal/image/PngChunk.d @ 213:36f5cb12e1a2

Update to SWT 3.4M7

author	Frank Benoit <benoit@tionex.de>
date	Sat, 17 May 2008 17:34:28 +0200
parents	ab60f3309436
children

rev	line source
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	1 /*******************************************************************************
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	2 * Copyright (c) 2000, 2006 IBM Corporation and others.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	3 * All rights reserved. This program and the accompanying materials
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	4 * are made available under the terms of the Eclipse Public License v1.0
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	5 * which accompanies this distribution, and is available at
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	6 * http://www.eclipse.org/legal/epl-v10.html
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	7 *
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	8 * Contributors:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	9 * IBM Corporation - initial API and implementation
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	10 * Port to the D programming language:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	11 * Frank Benoit <benoit@tionex.de>
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	12 *******************************************************************************/
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	13 module dwt.internal.image.PngChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	14
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	15
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	16 import dwt.DWT;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	17 import dwt.internal.image.LEDataInputStream;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	18 import dwt.internal.image.PngFileReadState;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	19 import dwt.internal.image.PngIhdrChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	20 import dwt.internal.image.PngPlteChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	21 import dwt.internal.image.PngIdatChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	22 import dwt.internal.image.PngIendChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	23 import dwt.internal.image.PngTrnsChunk;
213 36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	24 import dwt.dwthelper.utils;
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	25
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	26 import tango.core.Exception;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	27 import tango.text.convert.Format;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	28
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	29 class PngChunk {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	30 byte[] reference;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	31
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	32 static const int LENGTH_OFFSET = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	33 static const int TYPE_OFFSET = 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	34 static const int DATA_OFFSET = 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	35
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	36 static const int TYPE_FIELD_LENGTH = 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	37 static const int LENGTH_FIELD_LENGTH = 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	38 static const int MIN_LENGTH = 12;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	39
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	40 static const int CHUNK_UNKNOWN = -1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	41 // Critical chunks.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	42 static const int CHUNK_IHDR = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	43 static const int CHUNK_PLTE = 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	44 static const int CHUNK_IDAT = 2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	45 static const int CHUNK_IEND = 3;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	46 // Non-critical chunks.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	47 static const int CHUNK_tRNS = 5;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	48
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	49 static const byte[] TYPE_IHDR = cast(byte[])"IHDR";//{(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'};
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	50 static const byte[] TYPE_PLTE = cast(byte[])"PLTE";//{(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'};
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	51 static const byte[] TYPE_IDAT = cast(byte[])"IDAT";//{(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'};
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	52 static const byte[] TYPE_IEND = cast(byte[])"IEND";//{(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'};
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	53 static const byte[] TYPE_tRNS = cast(byte[])"tRNS";//{(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'};
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	54
213 36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	55 static const int[] CRC_TABLE;
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	56 //public static void static_this() {
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	57 static this() {
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	58 CRC_TABLE = new int[256];
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	59 for (int i = 0; i < 256; i++) {
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	60 CRC_TABLE[i] = i;
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	61 for (int j = 0; j < 8; j++) {
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	62 if ((CRC_TABLE[i] & 0x1) is 0) {
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	63 CRC_TABLE[i] = (CRC_TABLE[i] >> 1) & 0x7FFFFFFF;
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	64 } else {
36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	65 CRC_TABLE[i] = 0xEDB88320 ^ ((CRC_TABLE[i] >> 1) & 0x7FFFFFFF);
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	66 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	67 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	68 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	69 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	70
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	71 int length;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	72
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	73 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	74 * Construct a PngChunk using the reference bytes
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	75 * given.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	76 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	77 this(byte[] reference) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	78 setReference(reference);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	79 if (reference.length < LENGTH_OFFSET + LENGTH_FIELD_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	80 length = getInt32(LENGTH_OFFSET);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	81 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	82
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	83 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	84 * Construct a PngChunk with the specified number of
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	85 * data bytes.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	86 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	87 this(int dataLength) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	88 this(new byte[MIN_LENGTH + dataLength]);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	89 setLength(dataLength);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	90 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	91
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	92 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	93 * Get the PngChunk's reference byteArray;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	94 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	95 byte[] getReference() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	96 return reference;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	97 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	98
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	99 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	100 * Set the PngChunk's reference byteArray;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	101 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	102 void setReference(byte[] reference) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	103 this.reference = reference;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	104 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	105
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	106 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	107 * Get the 16-bit integer from the reference byte
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	108 * array at the given offset.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	109 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	110 int getInt16(int offset) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	111 int answer = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	112 answer \|= (reference[offset] & 0xFF) << 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	113 answer \|= (reference[offset + 1] & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	114 return answer;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	115 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	116
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	117 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	118 * Set the 16-bit integer in the reference byte
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	119 * array at the given offset.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	120 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	121 void setInt16(int offset, int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	122 reference[offset] = cast(byte) ((value >> 8) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	123 reference[offset + 1] = cast(byte) (value & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	124 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	125
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	126 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	127 * Get the 32-bit integer from the reference byte
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	128 * array at the given offset.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	129 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	130 int getInt32(int offset) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	131 int answer = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	132 answer \|= (reference[offset] & 0xFF) << 24;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	133 answer \|= (reference[offset + 1] & 0xFF) << 16;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	134 answer \|= (reference[offset + 2] & 0xFF) << 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	135 answer \|= (reference[offset + 3] & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	136 return answer;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	137 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	138
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	139 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	140 * Set the 32-bit integer in the reference byte
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	141 * array at the given offset.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	142 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	143 void setInt32(int offset, int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	144 reference[offset] = cast(byte) ((value >> 24) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	145 reference[offset + 1] = cast(byte) ((value >> 16) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	146 reference[offset + 2] = cast(byte) ((value >> 8) & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	147 reference[offset + 3] = cast(byte) (value & 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	148 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	149
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	150 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	151 * Get the length of the data component of this chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	152 * This is not the length of the entire chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	153 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	154 int getLength() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	155 return length;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	156 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	157
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	158 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	159 * Set the length of the data component of this chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	160 * This is not the length of the entire chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	161 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	162 void setLength(int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	163 setInt32(LENGTH_OFFSET, value);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	164 length = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	165 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	166
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	167 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	168 * Get the chunk type. This is a four byte value.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	169 * Each byte should be an ASCII character.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	170 * The first byte is upper case if the chunk is critical.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	171 * The second byte is upper case if the chunk is publicly defined.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	172 * The third byte must be upper case.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	173 * The fourth byte is upper case if the chunk is unsafe to copy.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	174 * Public chunk types are defined by the PNG Development Group.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	175 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	176 byte[] getTypeBytes() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	177 byte[] type = new byte[4];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	178 System.arraycopy(reference, TYPE_OFFSET, type, 0, TYPE_FIELD_LENGTH);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	179 return type;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	180 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	181
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	182 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	183 * Set the chunk type. This is a four byte value.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	184 * Each byte should be an ASCII character.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	185 * The first byte is upper case if the chunk is critical.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	186 * The second byte is upper case if the chunk is publicly defined.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	187 * The third byte must be upper case.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	188 * The fourth byte is upper case if the chunk is unsafe to copy.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	189 * Public chunk types are defined by the PNG Development Group.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	190 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	191 void setType(byte[] value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	192 if (value.length !is TYPE_FIELD_LENGTH) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	193 DWT.error (DWT.ERROR_INVALID_ARGUMENT);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	194 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	195 System.arraycopy(value, 0, reference, TYPE_OFFSET, TYPE_FIELD_LENGTH);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	196 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	197
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	198 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	199 * Get the chunk's data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	200 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	201 byte[] getData() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	202 int dataLength = getLength();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	203 if (reference.length < MIN_LENGTH + dataLength) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	204 DWT.error (DWT.ERROR_INVALID_RANGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	205 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	206 byte[] data = new byte[dataLength];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	207 System.arraycopy(reference, DATA_OFFSET, data, 0, dataLength);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	208 return data;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	209 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	210
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	211 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	212 * Set the chunk's data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	213 * This method has two side-effects.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	214 * 1. It will set the length field to be the length
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	215 * of the data array given.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	216 * 2. It will set the CRC field to the computed CRC
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	217 * value of the data array given.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	218 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	219 void setData(byte[] data) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	220 setLength(data.length);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	221 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	222 setCRC(computeCRC());
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	223 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	224
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	225 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	226 * Get the CRC value for the chunk's data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	227 * Ensure that the length field has a good
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	228 * value before making this call.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	229 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	230 int getCRC() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	231 int crcOffset = DATA_OFFSET + getLength();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	232 return getInt32(crcOffset);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	233 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	234
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	235 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	236 * Set the CRC value for the chunk's data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	237 * Ensure that the length field has a good
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	238 * value before making this call.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	239 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	240 void setCRC(int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	241 int crcOffset = DATA_OFFSET + getLength();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	242 setInt32(crcOffset, value);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	243 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	244
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	245 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	246 * Get the chunk's total size including the length, type, and crc fields.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	247 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	248 int getSize() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	249 return MIN_LENGTH + getLength();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	250 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	251
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	252 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	253 * Compute the CRC value for the chunk's data. Answer
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	254 * whether this value matches the value stored in the
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	255 * chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	256 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	257 bool checkCRC() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	258 int crc = computeCRC();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	259 int storedCRC = getCRC();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	260 return crc is storedCRC;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	261 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	262
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	263 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	264 * Answer the CRC value of chunk's data.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	265 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	266 int computeCRC() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	267 int crc = 0xFFFFFFFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	268 int start = TYPE_OFFSET;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	269 int stop = DATA_OFFSET + getLength();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	270 for (int i = start; i < stop; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	271 int index = (crc ^ reference[i]) & 0xFF;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	272 crc = CRC_TABLE[index] ^ ((crc >> 8) & 0x00FFFFFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	273 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	274 return ~crc;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	275 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	276
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	277 bool typeMatchesArray(byte[] array) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	278 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	279 if (reference[TYPE_OFFSET + i] !is array[i]){
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	280 return false;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	281 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	282 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	283 return true;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	284 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	285
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	286 bool isCritical() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	287 char c = cast(char) getTypeBytes()[0];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	288 return 'A' <= c && c <= 'Z';
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	289 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	290
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	291 int getChunkType() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	292 if (typeMatchesArray(TYPE_IHDR)) return CHUNK_IHDR;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	293 if (typeMatchesArray(TYPE_PLTE)) return CHUNK_PLTE;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	294 if (typeMatchesArray(TYPE_IDAT)) return CHUNK_IDAT;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	295 if (typeMatchesArray(TYPE_IEND)) return CHUNK_IEND;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	296 if (typeMatchesArray(TYPE_tRNS)) return CHUNK_tRNS;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	297 return CHUNK_UNKNOWN;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	298 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	299
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	300 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	301 * Read the next PNG chunk from the input stream given.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	302 * If unable to read a chunk, return null.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	303 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	304 static PngChunk readNextFromStream(LEDataInputStream stream) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	305 try {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	306 int headerLength = LENGTH_FIELD_LENGTH + TYPE_FIELD_LENGTH;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	307 byte[] headerBytes = new byte[headerLength];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	308 int result = stream.read(headerBytes, 0, headerLength);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	309 stream.unread(headerBytes);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	310 if (result !is headerLength) return null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	311
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	312 PngChunk tempChunk = new PngChunk(headerBytes);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	313
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	314 int chunkLength = tempChunk.getSize();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	315 byte[] chunk = new byte[chunkLength];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	316
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	317 result = stream.read(chunk, 0, chunkLength);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	318 if (result !is chunkLength) return null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	319
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	320 switch (tempChunk.getChunkType()) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	321 case CHUNK_IHDR:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	322 return new PngIhdrChunk(chunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	323 case CHUNK_PLTE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	324 return new PngPlteChunk(chunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	325 case CHUNK_IDAT:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	326 return new PngIdatChunk(chunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	327 case CHUNK_IEND:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	328 return new PngIendChunk(chunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	329 case CHUNK_tRNS:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	330 return new PngTrnsChunk(chunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	331 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	332 return new PngChunk(chunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	333 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	334 } catch (IOException e) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	335 return null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	336 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	337 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	338
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	339 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	340 * Answer whether the chunk is a valid PNG chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	341 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	342 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	343 if (reference.length < MIN_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	344
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	345 byte[] type = getTypeBytes();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	346
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	347 // The third character MUST be upper case.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	348 char c = cast(char) type[2];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	349 if (!('A' <= c && c <= 'Z')) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	350
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	351 // All characters must be letters.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	352 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	353 c = cast(char) type[i];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	354 if (!(('a' <= c && c <= 'z') \|\| ('A' <= c && c <= 'Z'))) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	355 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	356 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	357 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	358
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	359 // The stored CRC must match the data's computed CRC.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	360 if (!checkCRC()) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	361 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	362
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	363 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	364 * Provided so that subclasses can override and add
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	365 * data to the toString() call.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	366 */
212 ab60f3309436 reverted the char[] to String and use the an alias. Frank Benoit <benoit@tionex.de> parents: 80 diff changeset	367 String contributeToString() {
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	368 return "";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	369 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	370
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	371 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	372 * Returns a string containing a concise, human-readable
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	373 * description of the receiver.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	374 *
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	375 * @return a string representation of the event
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	376 */
213 36f5cb12e1a2 Update to SWT 3.4M7 Frank Benoit <benoit@tionex.de> parents: 212 diff changeset	377 public override String toString() {
212 ab60f3309436 reverted the char[] to String and use the an alias. Frank Benoit <benoit@tionex.de> parents: 80 diff changeset	378 String buffer = Format( "{\n\tLength: {}\n\tType: {}{}\n\tCRC: {:X}\n}",
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	379 getLength(),
212 ab60f3309436 reverted the char[] to String and use the an alias. Frank Benoit <benoit@tionex.de> parents: 80 diff changeset	380 cast(String) getTypeBytes(),
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	381 contributeToString(),
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	382 getCRC());
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	383 return buffer;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	384 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	385
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	386 }

Mercurial > projects > dwt-win

annotate dwt/internal/image/PngChunk.d @ 213:36f5cb12e1a2