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annotate dwt/internal/image/PngDecodingDataStream.d @ 7:e831403a80a9

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Add 'cast' to casts
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:30:35 +0200
parents b903c16b6f48
children 5123b17c98ef
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.internal.image;
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12
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13
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14 import java.io.IOException;
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15 import java.io.InputStream;
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16
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17 import dwt.DWT;
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18
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19 public class PngDecodingDataStream : InputStream {
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20 InputStream stream;
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21 byte currentByte;
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22 int nextBitIndex;
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23
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24 PngLzBlockReader lzBlockReader;
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25 int adlerValue;
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26
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27 static final int PRIME = 65521;
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28 static final int MAX_BIT = 7;
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29
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30 this(InputStream stream) {
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31 super();
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32 this.stream = stream;
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33 nextBitIndex = MAX_BIT + 1;
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34 adlerValue = 1;
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35 lzBlockReader = new PngLzBlockReader(this);
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36 readCompressedDataHeader();
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37 lzBlockReader.readNextBlockHeader();
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38 }
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39
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40 /**
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41 * This method should be called when the image decoder thinks
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42 * that all of the compressed image data has been read. This
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43 * method will ensure that the next data value is an end of
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44 * block marker. If there are more blocks after this one,
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45 * the method will read them and ensure that they are empty.
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46 */
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47 void assertImageDataAtEnd() {
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48 lzBlockReader.assertCompressedDataAtEnd();
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49 }
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50
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51 public void close() {
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52 assertImageDataAtEnd();
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53 checkAdler();
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54 }
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55
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56 int getNextIdatBits(int length) {
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57 int value = 0;
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58 for (int i = 0; i < length; i++) {
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59 value |= (getNextIdatBit() << i);
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60 }
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61 return value;
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62 }
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63
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64 int getNextIdatBit() {
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65 if (nextBitIndex > MAX_BIT) {
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66 currentByte = getNextIdatByte();
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67 nextBitIndex = 0;
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68 }
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69 return (currentByte & (1 << nextBitIndex)) >> nextBitIndex++;
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70 }
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71
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72 byte getNextIdatByte() {
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73 byte nextByte = cast(byte)stream.read();
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74 nextBitIndex = MAX_BIT + 1;
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75 return nextByte;
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76 }
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77
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78 void updateAdler(byte value) {
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79 int low = adlerValue & 0xFFFF;
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80 int high = (adlerValue >> 16) & 0xFFFF;
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81 int valueInt = value & 0xFF;
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82 low = (low + valueInt) % PRIME;
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83 high = (low + high) % PRIME;
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84 adlerValue = (high << 16) | low;
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85 }
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86
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87 public int read() {
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88 byte nextDecodedByte = lzBlockReader.getNextByte();
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89 updateAdler(nextDecodedByte);
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90 return nextDecodedByte & 0xFF;
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91 }
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92
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93 public int read(byte[] buffer, int off, int len) {
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94 for (int i = 0; i < len; i++) {
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95 int b = read();
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96 if (b is -1) return i;
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97 buffer[off + i] = cast(byte)b;
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98 }
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99 return len;
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100 }
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101
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102 void error() {
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103 DWT.error(DWT.ERROR_INVALID_IMAGE);
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104 }
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105
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106 private void readCompressedDataHeader() {
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107 byte headerByte1 = getNextIdatByte();
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108 byte headerByte2 = getNextIdatByte();
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109
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110 int number = ((headerByte1 & 0xFF) << 8) | (headerByte2 & 0xFF);
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111 if (number % 31 !is 0) error();
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112
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113 int compressionMethod = headerByte1 & 0x0F;
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114 if (compressionMethod !is 8) error();
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115
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116 int windowSizeHint = (headerByte1 & 0xF0) >> 4;
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117 if (windowSizeHint > 7) error();
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118 int windowSize = (1 << (windowSizeHint + 8));
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119 lzBlockReader.setWindowSize(windowSize);
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120
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121 int dictionary = (headerByte2 & (1 << 5));
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122 if (dictionary !is 0) error();
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123
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124 // int compressionLevel = (headerByte2 & 0xC0) >> 6;
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125 }
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126
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127 void checkAdler() {
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128 int storedAdler = ((getNextIdatByte() & 0xFF) << 24)
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129 | ((getNextIdatByte() & 0xFF) << 16)
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130 | ((getNextIdatByte() & 0xFF) << 8)
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131 | (getNextIdatByte() & 0xFF);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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132 if (storedAdler !is adlerValue) error();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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133 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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134
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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135 }