Mercurial > projects > dwt-linux
annotate dwt/internal/image/PngChunk.d @ 238:380bad9f6852
reverted char[] to String
author | Frank Benoit <benoit@tionex.de> |
---|---|
date | Mon, 05 May 2008 00:42:55 +0200 |
parents | 08789b28bdf3 |
children |
rev | line source |
---|---|
134
116d23207a86
changed PNG loader to use internal inflating
Frank Benoit <benoit@tionex.de>
parents:
131
diff
changeset
|
1 /******************************************************************************* |
14 | 2 * Copyright (c) 2000, 2006 IBM Corporation and others. |
3 * All rights reserved. This program and the accompanying materials | |
4 * are made available under the terms of the Eclipse Public License v1.0 | |
5 * which accompanies this distribution, and is available at | |
6 * http://www.eclipse.org/legal/epl-v10.html | |
7 * | |
8 * Contributors: | |
9 * IBM Corporation - initial API and implementation | |
108 | 10 * Port to the D programming language: |
11 * Frank Benoit <benoit@tionex.de> | |
14 | 12 *******************************************************************************/ |
13 module dwt.internal.image.PngChunk; | |
14 | |
15 | |
71 | 16 import dwt.DWT; |
14 | 17 import dwt.internal.image.LEDataInputStream; |
18 import dwt.internal.image.PngFileReadState; | |
19 import dwt.internal.image.PngIhdrChunk; | |
20 import dwt.internal.image.PngPlteChunk; | |
21 import dwt.internal.image.PngIdatChunk; | |
22 import dwt.internal.image.PngIendChunk; | |
23 import dwt.internal.image.PngTrnsChunk; | |
200
08789b28bdf3
import dwt.dwthelper.utils now explicit
Frank Benoit <benoit@tionex.de>
parents:
150
diff
changeset
|
24 import dwt.dwthelper.utils; |
14 | 25 |
26 import tango.core.Exception; | |
27 import tango.text.convert.Format; | |
28 | |
29 class PngChunk { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
30 byte[] reference; |
14 | 31 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
32 static const int LENGTH_OFFSET = 0; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
33 static const int TYPE_OFFSET = 4; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
34 static const int DATA_OFFSET = 8; |
14 | 35 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
36 static const int TYPE_FIELD_LENGTH = 4; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
37 static const int LENGTH_FIELD_LENGTH = 4; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
38 static const int MIN_LENGTH = 12; |
14 | 39 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
40 static const int CHUNK_UNKNOWN = -1; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
41 // Critical chunks. |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
42 static const int CHUNK_IHDR = 0; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
43 static const int CHUNK_PLTE = 1; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
44 static const int CHUNK_IDAT = 2; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
45 static const int CHUNK_IEND = 3; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
46 // Non-critical chunks. |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
47 static const int CHUNK_tRNS = 5; |
14 | 48 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
49 static const byte[] TYPE_IHDR = cast(byte[])"IHDR";//{(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'}; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
50 static const byte[] TYPE_PLTE = cast(byte[])"PLTE";//{(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'}; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
51 static const byte[] TYPE_IDAT = cast(byte[])"IDAT";//{(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'}; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
52 static const byte[] TYPE_IEND = cast(byte[])"IEND";//{(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'}; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
53 static const byte[] TYPE_tRNS = cast(byte[])"tRNS";//{(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'}; |
14 | 54 |
104 | 55 static const int[] CRC_TABLE; |
56 //public static void static_this() { | |
57 static this() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
58 CRC_TABLE = new int[256]; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
59 for (int i = 0; i < 256; i++) { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
60 CRC_TABLE[i] = i; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
61 for (int j = 0; j < 8; j++) { |
131 | 62 if ((CRC_TABLE[i] & 0x1) is 0) { |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
63 CRC_TABLE[i] = (CRC_TABLE[i] >> 1) & 0x7FFFFFFF; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
64 } else { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
65 CRC_TABLE[i] = 0xEDB88320 ^ ((CRC_TABLE[i] >> 1) & 0x7FFFFFFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
66 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
67 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
68 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
69 } |
14 | 70 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
71 int length; |
14 | 72 |
73 /** | |
74 * Construct a PngChunk using the reference bytes | |
75 * given. | |
76 */ | |
77 this(byte[] reference) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
78 setReference(reference); |
71 | 79 if (reference.length < LENGTH_OFFSET + LENGTH_FIELD_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE); |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
80 length = getInt32(LENGTH_OFFSET); |
14 | 81 } |
82 | |
83 /** | |
84 * Construct a PngChunk with the specified number of | |
85 * data bytes. | |
86 */ | |
87 this(int dataLength) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
88 this(new byte[MIN_LENGTH + dataLength]); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
89 setLength(dataLength); |
14 | 90 } |
91 | |
92 /** | |
93 * Get the PngChunk's reference byteArray; | |
94 */ | |
95 byte[] getReference() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
96 return reference; |
14 | 97 } |
98 | |
99 /** | |
100 * Set the PngChunk's reference byteArray; | |
101 */ | |
102 void setReference(byte[] reference) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
103 this.reference = reference; |
14 | 104 } |
105 | |
106 /** | |
107 * Get the 16-bit integer from the reference byte | |
108 * array at the given offset. | |
109 */ | |
110 int getInt16(int offset) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
111 int answer = 0; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
112 answer |= (reference[offset] & 0xFF) << 8; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
113 answer |= (reference[offset + 1] & 0xFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
114 return answer; |
14 | 115 } |
116 | |
117 /** | |
118 * Set the 16-bit integer in the reference byte | |
119 * array at the given offset. | |
120 */ | |
121 void setInt16(int offset, int value) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
122 reference[offset] = cast(byte) ((value >> 8) & 0xFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
123 reference[offset + 1] = cast(byte) (value & 0xFF); |
14 | 124 } |
125 | |
126 /** | |
127 * Get the 32-bit integer from the reference byte | |
128 * array at the given offset. | |
129 */ | |
130 int getInt32(int offset) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
131 int answer = 0; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
132 answer |= (reference[offset] & 0xFF) << 24; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
133 answer |= (reference[offset + 1] & 0xFF) << 16; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
134 answer |= (reference[offset + 2] & 0xFF) << 8; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
135 answer |= (reference[offset + 3] & 0xFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
136 return answer; |
14 | 137 } |
138 | |
139 /** | |
140 * Set the 32-bit integer in the reference byte | |
141 * array at the given offset. | |
142 */ | |
143 void setInt32(int offset, int value) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
144 reference[offset] = cast(byte) ((value >> 24) & 0xFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
145 reference[offset + 1] = cast(byte) ((value >> 16) & 0xFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
146 reference[offset + 2] = cast(byte) ((value >> 8) & 0xFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
147 reference[offset + 3] = cast(byte) (value & 0xFF); |
14 | 148 } |
149 | |
150 /** | |
151 * Get the length of the data component of this chunk. | |
152 * This is not the length of the entire chunk. | |
153 */ | |
154 int getLength() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
155 return length; |
14 | 156 } |
157 | |
158 /** | |
159 * Set the length of the data component of this chunk. | |
160 * This is not the length of the entire chunk. | |
161 */ | |
162 void setLength(int value) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
163 setInt32(LENGTH_OFFSET, value); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
164 length = value; |
14 | 165 } |
166 | |
167 /** | |
168 * Get the chunk type. This is a four byte value. | |
169 * Each byte should be an ASCII character. | |
170 * The first byte is upper case if the chunk is critical. | |
171 * The second byte is upper case if the chunk is publicly defined. | |
172 * The third byte must be upper case. | |
173 * The fourth byte is upper case if the chunk is unsafe to copy. | |
174 * Public chunk types are defined by the PNG Development Group. | |
175 */ | |
176 byte[] getTypeBytes() { | |
25
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
177 byte[] type = new byte[4]; |
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
178 System.arraycopy(reference, TYPE_OFFSET, type, 0, TYPE_FIELD_LENGTH); |
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
179 return type; |
14 | 180 } |
181 | |
182 /** | |
183 * Set the chunk type. This is a four byte value. | |
184 * Each byte should be an ASCII character. | |
185 * The first byte is upper case if the chunk is critical. | |
186 * The second byte is upper case if the chunk is publicly defined. | |
187 * The third byte must be upper case. | |
188 * The fourth byte is upper case if the chunk is unsafe to copy. | |
189 * Public chunk types are defined by the PNG Development Group. | |
190 */ | |
191 void setType(byte[] value) { | |
131 | 192 if (value.length !is TYPE_FIELD_LENGTH) { |
71 | 193 DWT.error (DWT.ERROR_INVALID_ARGUMENT); |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
194 } |
25
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
195 System.arraycopy(value, 0, reference, TYPE_OFFSET, TYPE_FIELD_LENGTH); |
14 | 196 } |
197 | |
198 /** | |
199 * Get the chunk's data. | |
200 */ | |
201 byte[] getData() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
202 int dataLength = getLength(); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
203 if (reference.length < MIN_LENGTH + dataLength) { |
71 | 204 DWT.error (DWT.ERROR_INVALID_RANGE); |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
205 } |
25
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
206 byte[] data = new byte[dataLength]; |
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
207 System.arraycopy(reference, DATA_OFFSET, data, 0, dataLength); |
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
208 return data; |
14 | 209 } |
210 | |
211 /** | |
212 * Set the chunk's data. | |
213 * This method has two side-effects. | |
214 * 1. It will set the length field to be the length | |
215 * of the data array given. | |
216 * 2. It will set the CRC field to the computed CRC | |
217 * value of the data array given. | |
218 */ | |
219 void setData(byte[] data) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
220 setLength(data.length); |
25
fc2b263b8a3f
Merged back the System.arraycopy and use a System class
Frank Benoit <benoit@tionex.de>
parents:
14
diff
changeset
|
221 System.arraycopy(data, 0, reference, DATA_OFFSET, data.length); |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
222 setCRC(computeCRC()); |
14 | 223 } |
224 | |
225 /** | |
226 * Get the CRC value for the chunk's data. | |
227 * Ensure that the length field has a good | |
228 * value before making this call. | |
229 */ | |
230 int getCRC() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
231 int crcOffset = DATA_OFFSET + getLength(); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
232 return getInt32(crcOffset); |
14 | 233 } |
234 | |
235 /** | |
236 * Set the CRC value for the chunk's data. | |
237 * Ensure that the length field has a good | |
238 * value before making this call. | |
239 */ | |
240 void setCRC(int value) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
241 int crcOffset = DATA_OFFSET + getLength(); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
242 setInt32(crcOffset, value); |
14 | 243 } |
244 | |
245 /** | |
246 * Get the chunk's total size including the length, type, and crc fields. | |
247 */ | |
248 int getSize() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
249 return MIN_LENGTH + getLength(); |
14 | 250 } |
251 | |
252 /** | |
253 * Compute the CRC value for the chunk's data. Answer | |
254 * whether this value matches the value stored in the | |
255 * chunk. | |
256 */ | |
257 bool checkCRC() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
258 int crc = computeCRC(); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
259 int storedCRC = getCRC(); |
131 | 260 return crc is storedCRC; |
14 | 261 } |
262 | |
263 /** | |
264 * Answer the CRC value of chunk's data. | |
265 */ | |
266 int computeCRC() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
267 int crc = 0xFFFFFFFF; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
268 int start = TYPE_OFFSET; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
269 int stop = DATA_OFFSET + getLength(); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
270 for (int i = start; i < stop; i++) { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
271 int index = (crc ^ reference[i]) & 0xFF; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
272 crc = CRC_TABLE[index] ^ ((crc >> 8) & 0x00FFFFFF); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
273 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
274 return ~crc; |
14 | 275 } |
276 | |
277 bool typeMatchesArray(byte[] array) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
278 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) { |
131 | 279 if (reference[TYPE_OFFSET + i] !is array[i]){ |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
280 return false; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
281 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
282 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
283 return true; |
14 | 284 } |
285 | |
286 bool isCritical() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
287 char c = cast(char) getTypeBytes()[0]; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
288 return 'A' <= c && c <= 'Z'; |
14 | 289 } |
290 | |
291 int getChunkType() { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
292 if (typeMatchesArray(TYPE_IHDR)) return CHUNK_IHDR; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
293 if (typeMatchesArray(TYPE_PLTE)) return CHUNK_PLTE; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
294 if (typeMatchesArray(TYPE_IDAT)) return CHUNK_IDAT; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
295 if (typeMatchesArray(TYPE_IEND)) return CHUNK_IEND; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
296 if (typeMatchesArray(TYPE_tRNS)) return CHUNK_tRNS; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
297 return CHUNK_UNKNOWN; |
14 | 298 } |
299 | |
300 /** | |
301 * Read the next PNG chunk from the input stream given. | |
302 * If unable to read a chunk, return null. | |
303 */ | |
304 static PngChunk readNextFromStream(LEDataInputStream stream) { | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
305 try { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
306 int headerLength = LENGTH_FIELD_LENGTH + TYPE_FIELD_LENGTH; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
307 byte[] headerBytes = new byte[headerLength]; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
308 int result = stream.read(headerBytes, 0, headerLength); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
309 stream.unread(headerBytes); |
131 | 310 if (result !is headerLength) return null; |
14 | 311 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
312 PngChunk tempChunk = new PngChunk(headerBytes); |
14 | 313 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
314 int chunkLength = tempChunk.getSize(); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
315 byte[] chunk = new byte[chunkLength]; |
134
116d23207a86
changed PNG loader to use internal inflating
Frank Benoit <benoit@tionex.de>
parents:
131
diff
changeset
|
316 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
317 result = stream.read(chunk, 0, chunkLength); |
131 | 318 if (result !is chunkLength) return null; |
14 | 319 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
320 switch (tempChunk.getChunkType()) { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
321 case CHUNK_IHDR: |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
322 return new PngIhdrChunk(chunk); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
323 case CHUNK_PLTE: |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
324 return new PngPlteChunk(chunk); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
325 case CHUNK_IDAT: |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
326 return new PngIdatChunk(chunk); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
327 case CHUNK_IEND: |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
328 return new PngIendChunk(chunk); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
329 case CHUNK_tRNS: |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
330 return new PngTrnsChunk(chunk); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
331 default: |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
332 return new PngChunk(chunk); |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
333 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
334 } catch (IOException e) { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
335 return null; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
336 } |
14 | 337 } |
338 | |
339 /** | |
340 * Answer whether the chunk is a valid PNG chunk. | |
341 */ | |
342 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) { | |
71 | 343 if (reference.length < MIN_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE); |
14 | 344 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
345 byte[] type = getTypeBytes(); |
14 | 346 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
347 // The third character MUST be upper case. |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
348 char c = cast(char) type[2]; |
71 | 349 if (!('A' <= c && c <= 'Z')) DWT.error(DWT.ERROR_INVALID_IMAGE); |
14 | 350 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
351 // All characters must be letters. |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
352 for (int i = 0; i < TYPE_FIELD_LENGTH; i++) { |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
353 c = cast(char) type[i]; |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
354 if (!(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))) { |
71 | 355 DWT.error(DWT.ERROR_INVALID_IMAGE); |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
356 } |
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
357 } |
14 | 358 |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
359 // The stored CRC must match the data's computed CRC. |
71 | 360 if (!checkCRC()) DWT.error(DWT.ERROR_INVALID_IMAGE); |
14 | 361 } |
362 | |
363 /** | |
364 * Provided so that subclasses can override and add | |
365 * data to the toString() call. | |
366 */ | |
238 | 367 String contributeToString() { |
14 | 368 return ""; |
369 } | |
370 | |
371 /** | |
372 * Returns a string containing a concise, human-readable | |
373 * description of the receiver. | |
374 * | |
375 * @return a string representation of the event | |
376 */ | |
238 | 377 public override String toString() { |
378 String buffer = Format( "{\n\tLength: {}\n\tType: {}{}\n\tCRC: {:X}\n}", | |
14 | 379 getLength(), |
238 | 380 cast(String) getTypeBytes(), |
14 | 381 contributeToString(), |
382 getCRC()); | |
59
8cec8f536af3
All D sources complete gvim retab (4 spaces), bug with Composite moveAbove/moveBelow fixed.
Frank Benoit <benoit@tionex.de>
parents:
54
diff
changeset
|
383 return buffer; |
14 | 384 } |
385 | |
386 } |