1 | // Copyright (c) 2013 by István Váradi
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2 |
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3 | // This file is part of VSCPL, a simple cross-platform utility library
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4 |
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5 | // Redistribution and use in source and binary forms, with or without
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6 | // modification, are permitted provided that the following conditions are met:
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7 |
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8 | // 1. Redistributions of source code must retain the above copyright notice, this
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9 | // list of conditions and the following disclaimer.
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10 | // 2. Redistributions in binary form must reproduce the above copyright notice,
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11 | // this list of conditions and the following disclaimer in the documentation
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12 | // and/or other materials provided with the distribution.
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13 |
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14 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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15 | // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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16 | // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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17 | // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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18 | // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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19 | // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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20 | // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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21 | // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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22 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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23 | // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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24 |
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25 | // The views and conclusions contained in the software and documentation are those
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26 | // of the authors and should not be interpreted as representing official policies,
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27 | // either expressed or implied, of the FreeBSD Project.
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28 |
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29 | //------------------------------------------------------------------------------
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30 |
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31 | #include "BlockingStream.h"
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32 |
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33 | #include "ReadingBuffer.h"
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34 | #include "WritingBuffer.h"
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35 | #include "Waiter.h"
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36 |
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37 | #include <cstring>
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38 | #include <cstdio>
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39 |
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40 | //------------------------------------------------------------------------------
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41 |
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42 | using hu::varadiistvan::scpl::io::BlockingStream;
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43 |
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44 | using std::min;
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45 |
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46 | //------------------------------------------------------------------------------
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47 |
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48 | inline bool BlockingStream::checkInterrupted()
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49 | {
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50 | if (!interrupted) {
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51 | interrupted = event.check();
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52 | if (!interrupted && event.failed()) {
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53 | setErrorCode(event.getErrorCode());
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54 | }
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55 | }
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56 |
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57 | return interrupted;
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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 | bool BlockingStream::read(void* dest, size_t length)
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63 | {
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64 | unsigned char* d = reinterpret_cast<unsigned char*>(dest);
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65 |
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66 | ReadingBuffer& readingBuffer = stream.getReadingBuffer();
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67 | while (length>0) {
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68 | size_t copied = readingBuffer.extract(d, length, readingOffset);
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69 | readingOffset += copied;
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70 | length -= copied;
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71 | d += copied;
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72 |
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73 | if (length!=0) {
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74 | if (!fill()) return false;
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75 | }
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76 | }
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77 |
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78 | return true;
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79 | }
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80 |
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81 | //------------------------------------------------------------------------------
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82 |
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83 | bool BlockingStream::skip(size_t length)
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84 | {
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85 | ReadingBuffer& readingBuffer = stream.getReadingBuffer();
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86 | while (length>0) {
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87 | size_t toSkip = min(length, readingBuffer.getLength() - readingOffset);
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88 | readingOffset += toSkip;
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89 | length -= toSkip;
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90 |
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91 | if (length!=0) {
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92 | if (!fill()) return false;
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93 | }
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94 | }
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95 |
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96 | return true;
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97 | }
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98 |
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99 | //------------------------------------------------------------------------------
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100 |
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101 | bool BlockingStream::write(const void* src, size_t length)
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102 | {
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103 | const unsigned char* s = reinterpret_cast<const unsigned char*>(src);
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104 |
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105 | WritingBuffer& writingBuffer = stream.getWritingBuffer();
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106 | while(length>0) {
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107 | size_t copied = writingBuffer.append(s, length);
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108 | length -= copied;
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109 | s += copied;
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110 |
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111 | if (length==0) break;
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112 | if (!flush()) return false;
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113 | }
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114 |
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115 | return true;
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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 | bool BlockingStream::flush()
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121 | {
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122 | WritingBuffer& writingBuffer = stream.getWritingBuffer();
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123 | while (*this) {
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124 | if (checkInterrupted()) return false;
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125 |
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126 | if (writingBuffer.write()) {
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127 | return true;
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128 | } else if (writingBuffer.failed()) {
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129 | setErrorCode(writingBuffer.getErrorCode());
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130 | } else {
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131 | Waiter* waiter = stream.getWaiter();
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132 | waiter->wait();
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133 | if (waiter->failed()) {
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134 | setErrorCode(waiter->getErrorCode());
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135 | }
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136 | }
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137 | }
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138 | return false;
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139 | }
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140 |
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141 | //------------------------------------------------------------------------------
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142 |
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143 | bool BlockingStream::fill()
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144 | {
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145 | ReadingBuffer& readingBuffer = stream.getReadingBuffer();
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146 |
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147 | readingBuffer.reset();
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148 | readingOffset = 0;
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149 | while (*this) {
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150 | if (checkInterrupted()) return false;
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151 |
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152 | if (readingBuffer.read()) {
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153 | eof = readingBuffer.isEmpty();
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154 | return !eof;
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155 | } else if (readingBuffer.failed()) {
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156 | setErrorCode(readingBuffer.getErrorCode());
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157 | } else {
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158 | Waiter* waiter = stream.getWaiter();
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159 | waiter->wait();
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160 | if (waiter->failed()) {
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161 | setErrorCode(waiter->getErrorCode());
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162 | return false;
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163 | }
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164 | }
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165 | }
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166 | return false;
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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 | // Local Variables:
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172 | // mode: C++
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173 | // c-basic-offset: 4
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174 | // indent-tabs-mode: nil
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175 | // End:
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