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1 /*******************************************************************************
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2
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3 copyright: Copyright (c) 2007 Kris Bell. All rights reserved
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4
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5 license: BSD style: $(LICENSE)
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6
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7 version: Initial release: June 2007
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8
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9 author: Kris
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10
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11 *******************************************************************************/
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12
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13 module tango.io.stream.GreedyStream;
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14
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15 private import tango.io.Conduit;
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16
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17
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18 /*******************************************************************************
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19
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20 A conduit filter that ensures its input is read in full. There's
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21 also an optional readExact() for more explicit requests
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22
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23 *******************************************************************************/
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24
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25 class GreedyInput : InputFilter
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26 {
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27 /***********************************************************************
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28
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29 Propagate ctor to superclass
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30
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31 ***********************************************************************/
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32
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33 this (InputStream stream)
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34 {
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35 super (stream);
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36 }
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37
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38 /***********************************************************************
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39
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40 Fill the provided array. Returns the number of bytes
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41 actually read, which will be less that dst.length when
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42 Eof has been reached, and then Eof thereafter
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43
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44 ***********************************************************************/
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45
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46 final override uint read (void[] dst)
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47 {
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48 uint len = 0;
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49
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50 while (len < dst.length)
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51 {
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52 auto i = host.read (dst [len .. $]);
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53 if (i is Eof)
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54 return (len ? len : i);
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55 len += i;
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56 }
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57 return len;
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58 }
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59
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60 /***********************************************************************
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61
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62 Read from a stream into a target array. The provided dst
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63 will be fully populated with content from the input.
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64
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65 This differs from read in that it will throw an exception
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66 where an Eof condition is reached before input has completed
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67
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68 ***********************************************************************/
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69
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70 final GreedyInput readExact (void[] dst)
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71 {
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72 while (dst.length)
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73 {
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74 auto i = read (dst);
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75 if (i is Eof)
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76 conduit.error ("unexpected Eof while reading: "~conduit.toString);
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77 dst = dst [i .. $];
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78 }
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79 return this;
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80 }
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81 }
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82
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83
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84
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85 /*******************************************************************************
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86
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87 A conduit filter that ensures its output is written in full. There's
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88 also an optional writeExact() for more explicit requests
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89
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90 *******************************************************************************/
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91
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92 class GreedyOutput : OutputFilter
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93 {
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94 /***********************************************************************
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95
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96 Propagate ctor to superclass
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97
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98 ***********************************************************************/
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99
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100 this (OutputStream stream)
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101 {
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102 super (stream);
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103 }
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104
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105 /***********************************************************************
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106
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107 Consume everything we were given. Returns the number of
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108 bytes written which will be less than src.length only
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109 when an Eof condition is reached, and Eof from that point
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110 forward
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111
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112 ***********************************************************************/
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113
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114 final override uint write (void[] src)
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115 {
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116 uint len = 0;
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117
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118 while (len < src.length)
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119 {
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120 auto i = host.write (src [len .. $]);
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121 if (i is Eof)
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122 return (len ? len : i);
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123 len += i;
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124 }
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125 return len;
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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 Write to stream from a source array. The provided src content
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131 will be written in full to the output.
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132
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133 This differs from write in that it will throw an exception
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134 where an Eof condition is reached before output has completed
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135
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136 ***********************************************************************/
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137
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138 final GreedyOutput writeExact (void[] src)
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139 {
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140 while (src.length)
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141 {
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142 auto i = write (src);
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143 if (i is Eof)
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144 conduit.error ("unexpected Eof while writing: "~conduit.toString);
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145 src = src [i .. $];
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146 }
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147 return this;
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148 }
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149 }
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150
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151
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152 /*******************************************************************************
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153
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154 *******************************************************************************/
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155
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156 debug (GreedyStream)
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157 {
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158 void main()
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159 {
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160 auto s = new GreedyInput (null);
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161 }
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162 } |
