Mercurial > projects > dwt-win

annotate dwt/internal/image/PngChunk.d @ 80:1801ddeb8f32

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
removed static ctors
author Frank Benoit <benoit@tionex.de>
date Wed, 06 Feb 2008 12:09:44 +0100
parents 9a64a7781bab
children ab60f3309436
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
24
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
25 import tango.core.Exception;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
26 import tango.text.convert.Format;
31
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
Frank Benoit <benoit@tionex.de>
parents: 2
diff changeset
27 import dwt.dwthelper.System;
2
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
80
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
55 private static /+const+/ int[] CRC_TABLE;
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
56 private static bool static_this_completed = false;
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
57 private static void static_this() {
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
58 if( static_this_completed ){
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
59 return;
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
60 }
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
61 synchronized {
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
62 if( static_this_completed ){
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
63 return;
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
64 }
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
65 CRC_TABLE = new int[256];
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
66 for (int i = 0; i < 256; i++) {
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
67 CRC_TABLE[i] = i;
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
68 for (int j = 0; j < 8; j++) {
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
69 if ((CRC_TABLE[i] & 0x1) is 0) {
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
70 CRC_TABLE[i] = (CRC_TABLE[i] >> 1) & 0x7FFFFFFF;
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
71 } else {
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
72 CRC_TABLE[i] = 0xEDB88320 ^ ((CRC_TABLE[i] >> 1) & 0x7FFFFFFF);
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
73 }
2
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
74 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
75 }
80
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
76 static_this_completed = true;
2
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
77 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
78 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
79
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
80 int length;
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 * Construct a PngChunk using the reference bytes
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
84 * given.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
85 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
86 this(byte[] reference) {
80
1801ddeb8f32 removed static ctors
Frank Benoit <benoit@tionex.de>
parents: 48
diff changeset
87 static_this();
2
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
88 setReference(reference);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
89 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
90 length = getInt32(LENGTH_OFFSET);
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 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
94 * Construct a PngChunk with the specified number of
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
95 * data bytes.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
96 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
97 this(int dataLength) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
98 this(new byte[MIN_LENGTH + dataLength]);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
99 setLength(dataLength);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
100 }
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 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
103 * Get the PngChunk's reference byteArray;
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 byte[] getReference() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
106 return reference;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
107 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
108
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 * Set the PngChunk's reference byteArray;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
111 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
112 void setReference(byte[] reference) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
113 this.reference = reference;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
114 }
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 * Get the 16-bit integer from the reference byte
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
118 * array at the given offset.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
119 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
120 int getInt16(int offset) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
121 int answer = 0;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
122 answer |= (reference[offset] & 0xFF) << 8;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
123 answer |= (reference[offset + 1] & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
124 return answer;
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 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
128 * Set the 16-bit integer in the reference byte
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
129 * array at the given offset.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
130 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
131 void setInt16(int offset, int value) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
132 reference[offset] = cast(byte) ((value >> 8) & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
133 reference[offset + 1] = cast(byte) (value & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
134 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
135
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
136 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
137 * Get the 32-bit integer from the reference byte
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
138 * array at the given offset.
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 int getInt32(int offset) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
141 int answer = 0;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
142 answer |= (reference[offset] & 0xFF) << 24;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
143 answer |= (reference[offset + 1] & 0xFF) << 16;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
144 answer |= (reference[offset + 2] & 0xFF) << 8;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
145 answer |= (reference[offset + 3] & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
146 return answer;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
147 }
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 * Set the 32-bit integer in the reference byte
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
151 * array at the given offset.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
152 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
153 void setInt32(int offset, int value) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
154 reference[offset] = cast(byte) ((value >> 24) & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
155 reference[offset + 1] = cast(byte) ((value >> 16) & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
156 reference[offset + 2] = cast(byte) ((value >> 8) & 0xFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
157 reference[offset + 3] = cast(byte) (value & 0xFF);
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
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
160 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
161 * 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
162 * This is not the length of the entire chunk.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
163 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
164 int getLength() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
165 return length;
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 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
169 * 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
170 * This is not the length of the entire chunk.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
171 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
172 void setLength(int value) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
173 setInt32(LENGTH_OFFSET, value);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
174 length = value;
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
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
177 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
178 * 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
179 * Each byte should be an ASCII character.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
180 * 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
181 * 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
182 * The third byte must be upper case.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
183 * 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
184 * 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
185 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
186 byte[] getTypeBytes() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
187 byte[] type = new byte[4];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
188 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
189 return type;
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
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
192 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
193 * 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
194 * Each byte should be an ASCII character.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
195 * 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
196 * 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
197 * The third byte must be upper case.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
198 * 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
199 * 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
200 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
201 void setType(byte[] value) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
202 if (value.length !is TYPE_FIELD_LENGTH) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
203 DWT.error (DWT.ERROR_INVALID_ARGUMENT);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
204 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
205 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
206 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
207
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
208 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
209 * Get the chunk's data.
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 byte[] getData() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
212 int dataLength = getLength();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
213 if (reference.length < MIN_LENGTH + dataLength) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
214 DWT.error (DWT.ERROR_INVALID_RANGE);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
215 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
216 byte[] data = new byte[dataLength];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
217 System.arraycopy(reference, DATA_OFFSET, data, 0, dataLength);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
218 return data;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
219 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
220
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
221 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
222 * Set the chunk's data.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
223 * This method has two side-effects.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
224 * 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
225 * of the data array given.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
226 * 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
227 * value of the data array given.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
228 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
229 void setData(byte[] data) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
230 setLength(data.length);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
231 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
232 setCRC(computeCRC());
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 * Get 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 int getCRC() {
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 return getInt32(crcOffset);
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 * Set the CRC value for the chunk's data.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
247 * Ensure that the length field has a good
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
248 * value before making this call.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
249 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
250 void setCRC(int value) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
251 int crcOffset = DATA_OFFSET + getLength();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
252 setInt32(crcOffset, value);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
253 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
254
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
255 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
256 * 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
257 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
258 int getSize() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
259 return MIN_LENGTH + getLength();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
260 }
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 * 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
264 * whether this value matches the value stored in the
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
265 * chunk.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
266 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
267 bool checkCRC() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
268 int crc = computeCRC();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
269 int storedCRC = getCRC();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
270 return crc is storedCRC;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
271 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
272
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 * Answer the CRC value of chunk's data.
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 int computeCRC() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
277 int crc = 0xFFFFFFFF;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
278 int start = TYPE_OFFSET;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
279 int stop = DATA_OFFSET + getLength();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
280 for (int i = start; i < stop; i++) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
281 int index = (crc ^ reference[i]) & 0xFF;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
282 crc = CRC_TABLE[index] ^ ((crc >> 8) & 0x00FFFFFF);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
283 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
284 return ~crc;
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
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
287 bool typeMatchesArray(byte[] array) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
288 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
289 if (reference[TYPE_OFFSET + i] !is array[i]){
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
290 return false;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
291 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
292 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
293 return true;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
294 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
295
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
296 bool isCritical() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
297 char c = cast(char) getTypeBytes()[0];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
298 return 'A' <= c && c <= 'Z';
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 int getChunkType() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
302 if (typeMatchesArray(TYPE_IHDR)) return CHUNK_IHDR;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
303 if (typeMatchesArray(TYPE_PLTE)) return CHUNK_PLTE;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
304 if (typeMatchesArray(TYPE_IDAT)) return CHUNK_IDAT;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
305 if (typeMatchesArray(TYPE_IEND)) return CHUNK_IEND;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
306 if (typeMatchesArray(TYPE_tRNS)) return CHUNK_tRNS;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
307 return CHUNK_UNKNOWN;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
308 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
309
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
310 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
311 * 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
312 * If unable to read a chunk, return null.
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 static PngChunk readNextFromStream(LEDataInputStream stream) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
315 try {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
316 int headerLength = LENGTH_FIELD_LENGTH + TYPE_FIELD_LENGTH;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
317 byte[] headerBytes = new byte[headerLength];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
318 int result = stream.read(headerBytes, 0, headerLength);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
319 stream.unread(headerBytes);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
320 if (result !is headerLength) return null;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
321
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
322 PngChunk tempChunk = new PngChunk(headerBytes);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
323
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
324 int chunkLength = tempChunk.getSize();
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
325 byte[] chunk = new byte[chunkLength];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
326
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
327 result = stream.read(chunk, 0, chunkLength);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
328 if (result !is chunkLength) return null;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
329
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
330 switch (tempChunk.getChunkType()) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
331 case CHUNK_IHDR:
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
332 return new PngIhdrChunk(chunk);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
333 case CHUNK_PLTE:
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
334 return new PngPlteChunk(chunk);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
335 case CHUNK_IDAT:
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
336 return new PngIdatChunk(chunk);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
337 case CHUNK_IEND:
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
338 return new PngIendChunk(chunk);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
339 case CHUNK_tRNS:
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
340 return new PngTrnsChunk(chunk);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
341 default:
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
342 return new PngChunk(chunk);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
343 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
344 } catch (IOException e) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
345 return null;
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 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
348
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
349 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
350 * Answer whether the chunk is a valid PNG chunk.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
351 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
352 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
353 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
354
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
355 byte[] type = getTypeBytes();
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 // The third character MUST be upper case.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
358 char c = cast(char) type[2];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
359 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
360
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
361 // All characters must be letters.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
362 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
363 c = cast(char) type[i];
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
364 if (!(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))) {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
365 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
366 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
367 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
368
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
369 // 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
370 if (!checkCRC()) DWT.error(DWT.ERROR_INVALID_IMAGE);
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
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
373 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
374 * Provided so that subclasses can override and add
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
375 * data to the toString() call.
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
376 */
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
377 char[] contributeToString() {
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
378 return "";
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
379 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
380
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
381 /**
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
382 * Returns a string containing a concise, human-readable
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
383 * description of the receiver.
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 * @return a string representation of the event
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
386 */
48
9a64a7781bab Added override and alias, first chunk. Thanks torhu for doing this patch.
Frank Benoit <benoit@tionex.de>
parents: 31
diff changeset
387 override public char[] toString() {
2
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
388 char[] buffer = Format( "{\n\tLength: {}\n\tType: {}{}\n\tCRC: {:X}\n}",
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
389 getLength(),
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
390 cast(char[]) getTypeBytes(),
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
391 contributeToString(),
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
392 getCRC());
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
393 return buffer;
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
394 }
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
395
57151e2793a2 More common modules from dwt-linux
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
396 }