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annotate dwt/browser.old/InputStream.d @ 288:4ee8c4237614

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author John Reimer<terminal.node@gmail.com>
date Tue, 05 Aug 2008 18:00:50 -0700
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2007 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 * Port to the D programming language:
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11 * John Reimer <terminal.node@gmail.com>
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12 *******************************************************************************/
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13
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14 module dwt.browser.InputStream;
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15
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16 import dwt.dwthelper.utils;
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17
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18 import dwt.internal.mozilla.nsError;
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19 import dwt.internal.mozilla.nsID;
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20 import dwt.internal.mozilla.nsIInputStream;
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21 import dwt.internal.mozilla.nsISupports;
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22
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23 import Math = tango.math.Math;
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24
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25 /******************************************************************************
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26
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27 COMMENTS: SWT implements this class as a replacement for the XPCOM
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28 implementation; it may be possible to use the XPCOM one instead
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29 (which also may be safer for D), but for now we'll follow SWT's example
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30 and use this reimplementation of InputStream. It should be trivial to
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31 move over to strict XPCOM implementation should the need arise. It appears
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32 that the Java SWT source uses many workarounds in order to use the XPCOM
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33 interface. For D, I remove much of the Java layered callback
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34 approach since it is no longer necessary. -JJR
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35
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36 ******************************************************************************/
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37
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38 class InputStream : nsIInputStream
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39 {
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40 int _refCount = 0;
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41 int _index = 0;
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42 byte[] _buffer;
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43
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44 /**************************************************************************
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45
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46 **************************************************************************/
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47
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48 this (byte[] buffer)
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49 {
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50 this._buffer = buffer;
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51 index = 0;
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52 }
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53
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54 /**************************************************************************
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55
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56 **************************************************************************/
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57
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58 nsrefcnt AddRef ()
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59 {
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60 _refCount++;
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61 return _refCount;
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62 }
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63
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64 /**************************************************************************
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65
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66 **************************************************************************/
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67
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68 nsresult QueryInterface ( inout nsID riid, void** ppvObject)
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69 {
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70 if (riid is null || ppvObject is null)
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71 return NS_ERROR_NO_INTERFACE;
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72
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73 nsID guid = riid;
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74
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75 if (guid == nsISupports.NS_ISUPPORTS_IID)
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76 {
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77 *ppvObject = cast(void*)cast(nsISupports) this;
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78 this.AddRef ();
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79 return NS_OK;
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80 }
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81
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82 if (guid == nsIInputStream.NS_IINPUTSTREAM_IID)
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83 {
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84 *ppvObject = cast(void*)cast(nsIInputStream) this;
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85 this.AddRef ();
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86 return NS_OK;
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87 }
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88
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89 *ppvObject = null;
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90 return NS_ERROR_NO_INTERFACE;
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91 }
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92
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93 /**************************************************************************
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94
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95 **************************************************************************/
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96
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97 nsrefcnt Release ()
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98 {
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99 _refCount--;
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100 if (_refCount is 0)
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101 return 0
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102 // delete this;
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103 return _refCount;
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104 }
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105
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106 /**************************************************************************
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107
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108 **************************************************************************/
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109
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110 nsresult Close ()
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111 {
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112 _buffer = null;
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113 _index = 0;
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114 return NS_OK;
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115 }
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116
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117 /**************************************************************************
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118
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119 **************************************************************************/
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120
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121 nsresult Available ( PRUint32* retval)
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122 {
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123 PRUint32 available = buffer is null ? 0 : buffer.length - _index;
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124 *retval = available;
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125 return NS_OK;
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126 }
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127
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128 /**************************************************************************
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129
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130 **************************************************************************/
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131
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132 nsresult Read(byte* aBuf, PRUint32 aCount, PRUint32* retval)
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133 {
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134 int max = Math.min (aCount, _buffer is null ? 0 : _buffer.length - _index);
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135
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136 if (max > 0)
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137 {
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138 aBuf[0..max] = _buffer[_index..$];
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139 _index += max;
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140 }
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141
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142 *retval = max;
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143 return NS_OK;
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144 }
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145
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146 /**************************************************************************
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147
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148 **************************************************************************/
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149
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150 nsresult ReadSegments (nsWriteSegmentFun aWriter, void* aClosure, PRUint32 aCount, PRUint32* retval)
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151 {
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152 int max = Math.min (aCount, buffer is null ? 0 : buffer.length - _index);
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153 PRUint32 cnt = max;
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154
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155 while (cnt > 0)
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156 {
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157 PRUint32 aWriteCount;
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158 nsresult rc = aWriter ( cast(nsIInputStream)this, aClosure, buffer.ptr, _index, cnt, &aWriteCount);
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159 if (rc !is NS_OK) break;
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160 _index += aWriteCount;
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161 cnt -= aWriteCount;
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162 }
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163
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164 *retval = (max - cnt);
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165 return NS_OK;
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166 }
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167
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168 /**************************************************************************
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169
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170 **************************************************************************/
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171
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172 nsresult IsNonBlocking ( PRUint32* retval)
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173 {
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John Reimer<terminal.node@gmail.com>
parents:
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174 *retval = 0;
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175 return NS_OK;
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176 }
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parents:
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177 }