1 | /* |
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2 | Copyright 2012 Willem Vermin, SARA |
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3 | |
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4 | Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | you may not use this file except in compliance with the License. |
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6 | You may obtain a copy of the License at |
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7 | |
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8 | http://www.apache.org/licenses/LICENSE-2.0 |
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9 | |
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10 | Unless required by applicable law or agreed to in writing, software |
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11 | distributed under the License is distributed on an "AS IS" BASIS, |
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12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | See the License for the specific language governing permissions and |
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14 | limitations under the License. |
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15 | */ |
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16 | |
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17 | #include <fstream> |
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18 | #include "token.h" |
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19 | #include "tofromstring.h" |
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20 | |
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21 | // |
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22 | // a token is a record in the pool file. |
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23 | // Format: |
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24 | // nmmmsssssssssssssssssssssssssssssssssssssssssssssssssssssssss |
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25 | // || | |
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26 | // || string |
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27 | // |number of times this string has been geven out |
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28 | // 0: not ready. 1: ready |
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29 | // |
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30 | // constructor: |
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31 | token::token() |
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32 | { |
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33 | this->setvalue(""); // value (string) |
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34 | this->setlinenr(0); // line number |
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35 | this->clearstatus(); // status: ready or not |
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36 | this->setcommitted(0); // counter |
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37 | this->pmarker = "pp"; // this marks the start of the pointer record |
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38 | this->pmarkerlen = this->pmarker.length(); |
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39 | } |
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40 | void token::clearstatus() |
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41 | { |
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42 | this->status = '0'; |
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43 | } |
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44 | char token::getstatus(void) |
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45 | { |
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46 | return this->status; |
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47 | } |
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48 | void token::ready() |
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49 | { |
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50 | this->status = '1'; |
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51 | } |
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52 | bool token::getready(void) |
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53 | { |
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54 | return this->status == '1'; |
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55 | } |
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56 | void token::setvalue(std::string v) |
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57 | { |
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58 | this->value = v; |
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59 | } |
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60 | void token::setlinenr(unsigned int l) |
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61 | { |
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62 | this->linenr = l; |
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63 | } |
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64 | unsigned int token::getlinenr(void) |
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65 | { |
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66 | return this->linenr; |
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67 | } |
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68 | std::string token::getvalue(void) |
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69 | { |
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70 | return this->value; |
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71 | } |
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72 | void token::setcommitted(unsigned int n) |
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73 | { |
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74 | this->committed = n; |
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75 | } |
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76 | unsigned int token::getcommitted(void) |
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77 | { |
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78 | return this->committed; |
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79 | } |
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80 | std::string token::gettotal(void) |
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81 | { |
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82 | return this->status + to_string(this->committed,comlen) + |
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83 | to_string(this->linenr,linenrlen)+ this->value; |
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84 | } |
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85 | // |
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86 | // puts everything that we know in repective variables |
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87 | // |
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88 | int token::puttotal(std::string t) |
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89 | { |
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90 | if (t.length() < this->valuestart) |
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91 | return 1; |
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92 | // check that all chars before the value are [0-9]: |
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93 | for (unsigned int i=0; i<valuestart; i++) |
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94 | { |
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95 | if (t[i] < '0' || t[i] > '9') |
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96 | return 1; |
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97 | } |
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98 | |
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99 | switch (t[this->statstart]) |
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100 | { |
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101 | case '0': break; |
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102 | case '1': break; |
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103 | default: return 1; |
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104 | break; |
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105 | } |
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106 | |
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107 | this->committed = from_string<long>(t.substr(comstart,comlen)); |
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108 | this->status = t[0]; |
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109 | this->linenr = from_string<unsigned int>(t.substr(linenrstart,linenrlen)); |
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110 | if (t.length() == valuestart) |
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111 | this->value=""; |
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112 | else |
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113 | this->value=t.substr(valuestart); |
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114 | return 0; |
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115 | } |
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116 | // |
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117 | // the file with the tokens |
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118 | // |
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119 | void token::setfile(std::fstream& file) |
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120 | { |
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121 | this->file = &file; |
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122 | } |
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123 | |
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124 | // |
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125 | // read token from file, from position pos, possibly |
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126 | // wrap around |
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127 | // on return: posused is used position |
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128 | // posnext is position of next token |
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129 | // |
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130 | int token::readnext(std::streampos pos, std::streampos& posused, std::streampos& posnext) |
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131 | { |
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132 | // |
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133 | // note: file is member of class token |
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134 | // |
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135 | posused = pos; |
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136 | file->seekg(posused); |
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137 | std::string line; |
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138 | getline(*file,line); |
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139 | if (file->eof() || file->fail() || file->bad()) |
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140 | return -1; |
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141 | if (line.substr(0,this->pmarkerlen) == this->pmarker) |
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142 | { |
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143 | posused = 0; |
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144 | file->seekg(posused); |
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145 | getline(*file,line); |
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146 | if (line.substr(0,this->pmarkerlen) == this->pmarker) |
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147 | return -1; |
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148 | } |
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149 | if (file->eof() || file->fail() || file->bad()) |
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150 | return -1; |
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151 | posnext = file->tellg(); |
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152 | return puttotal(line); |
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153 | } |
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154 | |
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155 | // |
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156 | // rewrite token on position p |
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157 | // on return, p contains the postion of the next token |
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158 | // |
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159 | int token::writetoken(std::streampos& p) |
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160 | { |
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161 | this->file->seekp(p); |
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162 | *file << this->gettotal() << std::endl; |
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163 | p = this->file->tellp(); |
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164 | this->file->flush(); |
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165 | |
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166 | return 0; |
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167 | } |
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168 | |
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169 | // |
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170 | // rewrites the location pointer |
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171 | // |
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172 | int token::writelocpointer(std::streampos locpointer) |
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173 | { |
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174 | // |
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175 | // note: in this function, file is member of class token |
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176 | // |
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177 | std::streampos g = file->tellg(); |
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178 | std::streampos p = file->tellp(); |
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179 | // |
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180 | // check if last line already contains locpointer |
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181 | // |
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182 | file->seekg(0,std::ios::end); |
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183 | long long filelength = file->tellg(); |
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184 | long long l = this->pointerlen +this->pmarkerlen+2; |
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185 | if ( l > filelength) |
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186 | { |
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187 | // |
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188 | // this file has no locpointer |
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189 | // |
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190 | file->seekp(0,std::ios::end); |
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191 | } |
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192 | else |
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193 | { |
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194 | file->seekg(-l,std::ios::end); |
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195 | char c = file->get(); |
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196 | std::string line; |
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197 | getline(*file,line); |
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198 | if (line.length() == this->pointerlen + this->pmarkerlen |
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199 | && line.substr(0,pmarkerlen) == pmarker |
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200 | && c == '\n') |
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201 | { |
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202 | // |
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203 | // this is a record with a locpointer value |
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204 | // |
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205 | file->seekp(-(std::streampos)((this->pointerlen)+this->pmarkerlen+1),std::ios::end); |
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206 | } |
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207 | else |
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208 | { |
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209 | file->seekp(0,std::ios::end); |
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210 | } |
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211 | } |
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212 | *file << pmarker << std::setfill('0') << std::setw(this->pointerlen) << |
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213 | locpointer << std::endl; |
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214 | file->flush(); |
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215 | file->seekg(g); |
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216 | file->seekp(p); |
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217 | return 0; |
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218 | } |
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219 | |
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220 | // |
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221 | // reads the location pinter |
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222 | // returns the value of the location pointer, |
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223 | // -1 if error |
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224 | // |
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225 | std::streampos token::readlocpointer() |
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226 | { |
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227 | std::streampos g = file->tellg(); |
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228 | |
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229 | long long l = this->pointerlen + this->pmarkerlen +2; |
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230 | file->seekg(0,std::ios::end); |
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231 | char c; |
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232 | if (file->tellg() < l) |
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233 | { |
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234 | file->seekg(0); |
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235 | c = '\n'; |
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236 | } |
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237 | else |
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238 | { |
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239 | file->seekg(-l,std::ios::end); |
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240 | c = file->get(); |
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241 | } |
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242 | std::string line; |
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243 | getline(*file,line); |
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244 | if (line.length() == this->pointerlen + this->pmarkerlen |
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245 | && line.substr(0,pmarkerlen) == pmarker |
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246 | && c == '\n') |
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247 | return from_string<long>(line.substr(2)); |
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248 | else |
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249 | return -1; |
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250 | file->seekg(g); |
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251 | return 0; |
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252 | } |
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