1 | // %pacpus:license{
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2 | // This file is part of the PACPUS framework distributed under the
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3 | // CECILL-C License, Version 1.0.
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4 | // %pacpus:license}
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5 | /// @version $Id: DbiteFile.cpp 76 2013-01-10 17:05:10Z kurdejma $
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6 |
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7 | #include <Pacpus/kernel/DbiteFile.h>
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8 | #include <Pacpus/kernel/DbiteException.h>
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9 | #include <Pacpus/kernel/DbiteFileTypes.h>
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10 | #include <Pacpus/kernel/Log.h>
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11 |
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12 | #include <cassert>
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13 | #include <cmath>
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14 | #include <iostream>
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15 | #include <limits>
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16 | #include <sstream>
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17 |
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18 | using namespace pacpus;
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19 | using namespace std;
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20 |
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21 | // FIXME: record size is only 8-bit long!
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22 | typedef int8_t VariableDataSizeT;
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23 |
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24 | DECLARE_STATIC_LOGGER("pacpus.core.DbiteFile");
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25 |
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26 | namespace pacpus
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27 | {
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28 | VariableDataSizeTag VariableDataSize;
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29 | ReadModeTag ReadMode;
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30 | WriteModeTag WriteMode;
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31 | DiagnoseModeTag DiagnoseMode;
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32 | }
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33 |
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34 | bool doesFileExist(const string & path);
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35 |
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36 | DbiteFile::DbiteFile()
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37 | : mIsWriting(false)
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38 | {
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39 | setPath("");
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40 |
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41 | (void) ReadMode; // unused
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42 | (void) WriteMode; // unused
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43 | (void) VariableDataSize; // unused
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44 | (void) DiagnoseMode; // unused
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45 | }
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46 |
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47 | DbiteFile::~DbiteFile()
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48 | {
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49 | if (isOpen()) {
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50 | close();
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51 | }
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52 | }
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53 |
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54 | DbiteFile::operator string()
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55 | {
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56 | static const int64_t kMicrosInSecond = 1000 * 1000;
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57 | stringstream os;
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58 |
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59 | os << "Signature : " << getSignature() << endl;
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60 | os << "Version : " << getVersion() << endl;
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61 | os << "Header size : " << getDataOffset() << " [bytes]" << endl;
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62 | os << "Record size : " << getRecordSize() << " [bytes]" << endl;
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63 | os << "Data type : " << getType() << endl;
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64 | os << "Time min. : " << getTimeMin() << endl;
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65 | os << "Time max. : " << getTimeMax() << endl;
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66 | os << "Duration : " << (getTimeMax() - getTimeMin()) / kMicrosInSecond << " [seconds]" << endl;
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67 | os << "File size : " << getFileSize() << " [bytes]" << endl;
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68 | os << "Record count : " << getRecordCount() << endl;
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69 |
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70 | return os.str();
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71 | }
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72 |
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73 | const string & DbiteFile::getPath() const
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74 | {
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75 | return mPath;
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76 | }
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77 |
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78 | void DbiteFile::setPath(const string & path)
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79 | {
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80 | mPath = path;
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81 | }
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82 |
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83 | void DbiteFile::open(const string & path, ReadModeTag)
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84 | {
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85 | mIsWriting = false;
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86 | if (isOpen()) {
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87 | LOG_DEBUG("file is already open, closing...");
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88 | close();
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89 | }
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90 |
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91 | setPath(path);
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92 |
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93 | mFile.open(getPath().c_str(), ios_base::binary | ios_base::in);
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94 | try {
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95 | checkFileOpen();
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96 | } catch (DbiteException & e) {
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97 | LOG_ERROR("Dbite exception: " << e.what());
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98 | close();
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99 | throw DbiteException("cannot open file for reading");
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100 | }
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101 |
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102 | try {
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103 | readHeader();
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104 | } catch (DbiteException & e) {
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105 | LOG_ERROR("Dbite exception: " << e.what());
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106 | // TODO: readAndDiagnoseHeader();
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107 | close();
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108 | throw DbiteException("cannot read header");
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109 | }
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110 | verifyHeader();
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111 | goToDataBegin();
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112 | }
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113 |
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114 | void DbiteFile::open(const string & path, WriteModeTag)
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115 | {
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116 | openWriteMode(path);
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117 | }
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118 |
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119 | void DbiteFile::open(const string & path, WriteModeTag, hdfile_header_t::DataTypeT type, hdfile_header_t::DataSizeT dataSize)
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120 | {
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121 | openWriteMode(path, type);
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122 | setRecordSize(dataSize);
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123 | }
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124 |
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125 | void DbiteFile::open(const string & path, WriteModeTag, hdfile_header_t::DataTypeT type, VariableDataSizeTag tag)
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126 | {
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127 | openWriteMode(path, type);
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128 | setRecordSize(tag);
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129 | }
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130 |
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131 | void DbiteFile::openWriteMode(const string & path, hdfile_header_t::DataTypeT type)
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132 | {
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133 | openWriteMode(path);
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134 | setType(type);
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135 | }
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136 |
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137 | void DbiteFile::openWriteMode(const string & path)
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138 | {
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139 | mIsWriting = true;
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140 | if (isOpen()) {
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141 | LOG_DEBUG("file is already open, closing...");
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142 | close();
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143 | }
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144 |
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145 | setPath(path);
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146 | bool fileExists = doesFileExist(path);
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147 | ios_base::openmode openmode;
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148 | if (fileExists) {
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149 | openmode = ios_base::binary | ios_base::in | ios_base::out;
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150 | } else {
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151 | openmode = ios_base::binary | ios_base::out;
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152 | }
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153 | mFile.open(getPath().c_str(), openmode);
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154 | if (!isOpen()) {
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155 | LOG_ERROR("cannot open file for writing");
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156 | throw DbiteException("cannot open file for writing");
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157 | }
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158 |
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159 | if (fileExists) {
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160 | // file exists
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161 | LOG_DEBUG("file already exists, appending");
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162 | try {
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163 | readHeader();
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164 | // TODO: check if same type and record size
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165 | } catch (DbiteException & e) {
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166 | LOG_ERROR("Dbite exception: " << e.what());
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167 | // TODO: readAndDiagnoseHeader();
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168 | close();
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169 | throw DbiteException("cannot read header");
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170 | }
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171 | } else {
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172 | // file does not exist
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173 | initializeHeader();
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174 | writeHeader();
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175 | }
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176 | //goToDataBegin();
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177 | goToFileEnd();
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178 | }
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179 |
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180 | void DbiteFile::initializeHeader()
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181 | {
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182 | setSignature();
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183 | setType(FILE_DBT_UNKNOWN);
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184 | setVersion(VERSION_NUMBER);
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185 | setDataOffset(sizeof(hdfile_header_t));
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186 | setRecordSize(0);
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187 | // same as header size
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188 | setFileSize(getDataOffset());
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189 | setTimeMin(numeric_limits<road_time_t>::max());
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190 | setTimeMax(numeric_limits<road_time_t>::min());
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191 | setRecordCount(0);
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192 | }
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193 |
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194 | void DbiteFile::close()
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195 | {
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196 | if (!isOpen()) {
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197 | LOG_WARN("file is not open");
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198 | return;
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199 | }
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200 | closeDbite();
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201 | setPath("");
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202 | }
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203 |
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204 | void DbiteFile::closeDbite()
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205 | {
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206 | if (mIsWriting) {
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207 | try {
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208 | writeHeader();
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209 | } catch (DbiteException & e) {
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210 | LOG_ERROR("cannot write header on close: " << e.what());
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211 | }
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212 | }
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213 | mFile.close();
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214 | }
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215 |
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216 | bool DbiteFile::isOpen() const
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217 | {
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218 | return mFile.is_open();
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219 | }
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220 |
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221 | void DbiteFile::goToFileBegin()
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222 | {
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223 | LOG_DEBUG("goToFileBegin()");
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224 | mFile.clear();
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225 | setReadPosition(0);
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226 | setWritePosition(0);
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227 | }
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228 |
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229 | void DbiteFile::goToDataBegin()
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230 | {
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231 | LOG_DEBUG("goToDataBegin()");
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232 | LOG_TRACE("getDataOffset() = " << getDataOffset());
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233 | mFile.clear();
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234 | setReadPosition(getDataOffset());
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235 | setWritePosition(getDataOffset());
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236 | }
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237 |
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238 | void DbiteFile::goToFileEnd()
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239 | {
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240 | LOG_TRACE("goToFileEnd()");
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241 | LOG_TRACE("getFileSize() = " << getFileSize());
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242 | mFile.clear();
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243 | // do not use fstream::seekg/seekp(0, ios_base::end),
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244 | // because in case of write failure,
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245 | // we should write at position=getFileSize() which can be before the actual file end
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246 | setReadPosition(getFileSize());
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247 | setWritePosition(getFileSize());
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248 | }
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249 |
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250 | int64_t DbiteFile::getReadPosition()
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251 | {
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252 | checkFileOpen();
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253 | return mFile.tellg();
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254 | }
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255 |
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256 | int64_t DbiteFile::getWritePosition()
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257 | {
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258 | checkFileOpen();
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259 | return mFile.tellp();
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260 | }
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261 |
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262 | void DbiteFile::setReadPosition(int64_t offset, ios_base::seekdir direction)
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263 | {
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264 | LOG_TRACE("set read position = " << offset << " direction = " << direction);
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265 | checkFileOpen();
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266 | mFile.seekg(offset, direction);
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267 | if (mFile.fail()) {
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268 | LOG_ERROR("failed to set write position");
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269 | }
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270 | }
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271 |
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272 | void DbiteFile::setReadPosition(int64_t position)
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273 | {
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274 | LOG_TRACE("set read position = " << position);
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275 | checkFileOpen();
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276 | mFile.seekg(position);
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277 | if (mFile.fail()) {
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278 | LOG_ERROR("failed to set read position");
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279 | }
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280 | }
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281 |
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282 | void DbiteFile::setWritePosition(int64_t offset, ios_base::seekdir direction)
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283 | {
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284 | LOG_TRACE("set write position = " << offset << " direction = " << direction);
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285 | checkFileOpen();
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286 | mFile.seekp(offset, direction);
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287 | if (mFile.fail()) {
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288 | LOG_ERROR("failed to set write position");
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289 | }
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290 | }
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291 |
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292 | void DbiteFile::setWritePosition(int64_t position)
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293 | {
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294 | LOG_TRACE("set write position = " << position);
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295 | checkFileOpen();
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296 | mFile.seekp(position);
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297 | if (mFile.fail()) {
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298 | LOG_ERROR("failed to set write position");
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299 | }
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300 | }
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301 |
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302 | const hdfile_header_t & DbiteFile::getHeader() const
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303 | {
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304 | return mHeader;
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305 | }
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306 |
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307 | hdfile_header_t & DbiteFile::header()
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308 | {
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309 | return mHeader;
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310 | }
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311 |
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312 | void DbiteFile::readHeader()
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313 | {
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314 | goToFileBegin();
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315 | checkFileOpen();
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316 | read((char *)(&mHeader), sizeof(mHeader));
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317 | LOG_DEBUG("file: " << getPath());
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318 | LOG_TRACE("header read:\n" << string(*this));
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319 | }
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320 |
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321 | void DbiteFile::verifyHeader()
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322 | {
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323 | // verify file size
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324 | const int64_t realFileSize = getRealFileSize();
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325 | const hdfile_header_t::FileSizeT fileSize = getFileSize();
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326 | if (realFileSize != fileSize) {
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327 | LOG_WARN("real file size different than header information");
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328 | LOG_INFO("real file size = " << realFileSize);
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329 | LOG_INFO("file size = " << fileSize);
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330 | }
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331 |
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332 | if (getVersion() != VERSION_NUMBER) {
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333 | LOG_ERROR("bad version number");
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334 | throw DbiteException("bad version number");
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335 | }
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336 |
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337 | if (!isSignatureCorrect()) {
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338 | LOG_ERROR("bad signature");
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339 | throw DbiteException("bad signature");
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340 | }
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341 |
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342 | LOG_DEBUG("header verified");
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343 | }
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344 |
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345 | void DbiteFile::writeHeader()
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346 | {
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347 | LOG_DEBUG("writing header:\n" << string(*this));
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348 |
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349 | goToFileBegin();
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350 |
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351 | LOG_DEBUG("begin position=" << getWritePosition());
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352 |
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353 | const size_t bytesToWrite = sizeof(mHeader);
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354 | write((char *)(&mHeader), bytesToWrite);
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355 | LOG_DEBUG("header written");
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356 |
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357 | LOG_DEBUG("final position=" << getWritePosition());
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358 | }
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359 |
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360 | string DbiteFile::getSignature() const
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361 | {
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362 | const char signature[] = { getHeader().Signature[0], getHeader().Signature[1], getHeader().Signature[2], getHeader().Signature[3], '\0' };
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363 | return signature;
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364 | }
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365 |
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366 | bool DbiteFile::isSignatureCorrect() const
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367 | {
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368 | if ('R' != getHeader().Signature[0]) {
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369 | return false;
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370 | }
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371 | if ('O' != getHeader().Signature[1]) {
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372 | return false;
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373 | }
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374 | if ('A' != getHeader().Signature[2]) {
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375 | return false;
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376 | }
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377 | if ('D' != getHeader().Signature[3]) {
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378 | return false;
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379 | }
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380 | return true;
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381 | }
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382 |
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383 | void DbiteFile::setSignature()
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384 | {
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385 | header().Signature[0] = 'R';
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386 | header().Signature[1] = 'O';
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387 | header().Signature[2] = 'A';
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388 | header().Signature[3] = 'D';
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389 | }
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390 |
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391 | hdfile_header_t::DataTypeT DbiteFile::getType() const
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392 | {
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393 | return getHeader().Type;
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394 | }
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395 |
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396 | void DbiteFile::setType(hdfile_header_t::DataTypeT type)
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397 | {
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398 | header().Type = type;
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399 | }
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400 |
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401 | hdfile_header_t::VersionT DbiteFile::getVersion() const
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402 | {
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403 | return getHeader().VersionNumber;
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404 | }
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405 |
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406 | void DbiteFile::setVersion(hdfile_header_t::VersionT version)
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407 | {
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408 | header().VersionNumber = version;
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409 | }
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410 |
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411 | hdfile_header_t::DataOffsetT DbiteFile::getDataOffset() const
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412 | {
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413 | return getHeader().DataOffset;
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414 | }
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415 |
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416 | void DbiteFile::setDataOffset(hdfile_header_t::DataOffsetT dataOffset)
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417 | {
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418 | header().DataOffset = dataOffset;
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419 | }
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420 |
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421 | hdfile_header_t::DataSizeT DbiteFile::getRecordSize() const
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422 | {
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423 | return getHeader().DataSize;
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424 | }
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425 |
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426 | void DbiteFile::setRecordSize(hdfile_header_t::DataSizeT recordSize)
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427 | {
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428 | header().DataSize = recordSize;
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429 | }
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430 |
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431 | void DbiteFile::setRecordSize(VariableDataSizeTag)
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432 | {
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433 | header().DataSize = hdfile_header_t::kVariableRecordSize;
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434 | }
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435 |
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436 | hdfile_header_t::FileSizeT DbiteFile::getFileSize() const
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437 | {
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438 | if (getHeader().FileSize < getHeader().DataOffset) {
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439 | LOG_WARN("wrong header information: file size lesser than data offset");
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440 | }
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441 | return getHeader().FileSize;
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442 | }
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443 |
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444 | void DbiteFile::setFileSize(hdfile_header_t::FileSizeT fileSize)
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445 | {
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446 | header().FileSize = fileSize;
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447 | }
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448 |
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449 | int64_t DbiteFile::getRealFileSize()
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450 | {
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451 | checkFileOpen();
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452 |
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453 | mFile.clear();
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454 | // save position
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455 | int64_t oldReadPosition = getReadPosition();
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456 | int64_t oldWritePosition = getWritePosition();
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457 |
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458 | // go to file end and get position = file size
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459 | goToFileEnd();
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460 | int64_t fileSize = mFile.tellg();
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461 |
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462 | // restore position
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463 | setReadPosition(oldReadPosition);
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464 | setWritePosition(oldWritePosition);
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465 | return fileSize;
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466 | }
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467 |
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468 | road_time_t DbiteFile::getTimeMin() const
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469 | {
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470 | return getHeader().TimeMin;
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471 | }
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472 |
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473 | void DbiteFile::setTimeMin(road_time_t time)
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474 | {
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475 | header().TimeMin = time;
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476 | }
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477 |
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478 | road_time_t DbiteFile::getTimeMax() const
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479 | {
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480 | return getHeader().TimeMax;
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481 | }
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482 |
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483 | void DbiteFile::setTimeMax(road_time_t time)
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484 | {
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485 | header().TimeMax = time;
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486 | }
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487 |
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488 | hdfile_header_t::RecordCountT DbiteFile::getRecordCount() const
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489 | {
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490 | return getHeader().NbRecords;
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491 | }
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492 |
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493 | void DbiteFile::setRecordCount(hdfile_header_t::RecordCountT recourdCount)
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494 | {
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495 | header().NbRecords = recourdCount;
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496 | }
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497 |
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498 | bool DbiteFile::isVariableDataSize() const
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499 | {
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500 | return hdfile_header_t::kVariableRecordSize == getRecordSize();
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501 | }
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502 |
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503 | bool DbiteFile::readRecord(size_t recordIndex, road_time_t & time, road_timerange_t & timeRange, char * data, size_t & dataSize)
|
---|
504 | {
|
---|
505 | LOG_DEBUG("reading record no. " << recordIndex);
|
---|
506 |
|
---|
507 | if (isVariableDataSize()) {
|
---|
508 | LOG_ERROR("cannot read nth record in a variable");
|
---|
509 | throw DbiteException("cannot read nth record in a variable");
|
---|
510 | }
|
---|
511 |
|
---|
512 | int64_t nthRecordPosition = getDataOffset() + recordIndex * (getRecordSize() + sizeof(road_time_t) + sizeof(road_timerange_t));
|
---|
513 | LOG_DEBUG(recordIndex << "th record position = " << nthRecordPosition);
|
---|
514 | if (getFileSize() < nthRecordPosition) {
|
---|
515 | LOG_WARN("wanted to read past the file end");
|
---|
516 | //throw DbiteException("wanted to read past the file end");
|
---|
517 | }
|
---|
518 | mFile.clear();
|
---|
519 | setReadPosition(nthRecordPosition);
|
---|
520 |
|
---|
521 | return readRecord(time, timeRange, data, dataSize);
|
---|
522 | }
|
---|
523 |
|
---|
524 | bool DbiteFile::readRecord(road_time_t & time, road_timerange_t & timeRange, char * buffer, size_t & bufferSize, const ReadDirection & direction)
|
---|
525 | {
|
---|
526 | if (!buffer) {
|
---|
527 | LOG_WARN("data buffer must be a non-NULL pointer");
|
---|
528 | throw DbiteException("data buffer must be a non-NULL pointer");
|
---|
529 | }
|
---|
530 |
|
---|
531 | return readRecordNoBufferCheck(time, timeRange, buffer, bufferSize, direction);
|
---|
532 | }
|
---|
533 |
|
---|
534 | bool DbiteFile::readRecord(road_time_t & time, road_timerange_t & timeRange, char * buffer, const ReadDirection & direction)
|
---|
535 | {
|
---|
536 | size_t bufferSize = getRecordSize();
|
---|
537 | return readRecord(time, timeRange, buffer, bufferSize, direction);
|
---|
538 | }
|
---|
539 |
|
---|
540 | bool DbiteFile::readRecord(road_time_t & time, road_timerange_t & timeRange, const ReadDirection & direction)
|
---|
541 | {
|
---|
542 | size_t bufferSize = 0;
|
---|
543 | return readRecordNoBufferCheck(time, timeRange, (char *) NULL, bufferSize, direction);
|
---|
544 | }
|
---|
545 |
|
---|
546 | bool DbiteFile::readRecordNoBufferCheck(road_time_t & time, road_timerange_t & timeRange, char * buffer, size_t & bufferSize, const ReadDirection & direction)
|
---|
547 | {
|
---|
548 | switch (direction) {
|
---|
549 | case ReadForward:
|
---|
550 | return readRecordForward(time, timeRange, buffer, bufferSize);
|
---|
551 | break;
|
---|
552 |
|
---|
553 | case ReadBackward:
|
---|
554 | return readRecordBackward(time, timeRange, buffer, bufferSize);
|
---|
555 | break;
|
---|
556 |
|
---|
557 | default:
|
---|
558 | assert(false && "wrong ReadDirection parameter");
|
---|
559 | return false;
|
---|
560 | }
|
---|
561 | }
|
---|
562 |
|
---|
563 | bool DbiteFile::readRecordForward(road_time_t & time, road_timerange_t & timeRange, char * buffer, size_t & bufferSize)
|
---|
564 | {
|
---|
565 | LOG_TRACE("reading record...");
|
---|
566 | checkFileOpen();
|
---|
567 |
|
---|
568 | int64_t initialPosition = getReadPosition();
|
---|
569 | LOG_TRACE("initial position = " << initialPosition);
|
---|
570 |
|
---|
571 | ////////////////////////////////////////
|
---|
572 | // read acquisition time
|
---|
573 | mFile.read((char *)(&time), sizeof(time));
|
---|
574 | if (!mFile) {
|
---|
575 | if (isEndOfFile()) {
|
---|
576 | bufferSize = 0;
|
---|
577 | return false;
|
---|
578 | }
|
---|
579 | LOG_ERROR("cannot read acquisition time");
|
---|
580 | throw DbiteException("cannot read acquisition time");
|
---|
581 | }
|
---|
582 |
|
---|
583 | ////////////////////////////////////////
|
---|
584 | // read acquisition time range
|
---|
585 | read((char *)(&timeRange), sizeof(timeRange));
|
---|
586 |
|
---|
587 | ////////////////////////////////////////
|
---|
588 | // get data and record size
|
---|
589 | size_t dataSize = 0;
|
---|
590 | size_t recordSize = sizeof(time) + sizeof(timeRange);
|
---|
591 | if (isVariableDataSize()) {
|
---|
592 | recordSize += 2 * sizeof(VariableDataSizeT);
|
---|
593 |
|
---|
594 | // read record size
|
---|
595 | VariableDataSizeT readVarDataSize = 0;
|
---|
596 | read((char *)(&readVarDataSize), sizeof(VariableDataSizeT));
|
---|
597 | dataSize = static_cast<size_t>(readVarDataSize);
|
---|
598 | LOG_DEBUG("variable record size = " << dataSize);
|
---|
599 | } else {
|
---|
600 | dataSize = getRecordSize();
|
---|
601 | }
|
---|
602 | recordSize += dataSize;
|
---|
603 |
|
---|
604 | ////////////////////////////////////////
|
---|
605 | // read/skip data
|
---|
606 | if (buffer) {
|
---|
607 | if (bufferSize < dataSize) {
|
---|
608 | LOG_WARN("buffer is smaller than the record size");
|
---|
609 | LOG_INFO("buffer size = " << bufferSize);
|
---|
610 | LOG_INFO("data size = " << dataSize);
|
---|
611 | throw DbiteException("buffer is smaller than the data size");
|
---|
612 | // TODO: don't throw exception, but read only as much data as possible
|
---|
613 | }
|
---|
614 |
|
---|
615 | // read data
|
---|
616 | read(buffer, dataSize);
|
---|
617 |
|
---|
618 | if (isVariableDataSize()) {
|
---|
619 | // read record size
|
---|
620 | VariableDataSizeT readVarDataSize = 0;
|
---|
621 | read((char *)(&readVarDataSize), sizeof(VariableDataSizeT));
|
---|
622 | size_t varDataSize = static_cast<size_t>(readVarDataSize);
|
---|
623 | LOG_TRACE("variable record size = " << varDataSize);
|
---|
624 |
|
---|
625 | if (dataSize != varDataSize) {
|
---|
626 | LOG_WARN("corrupted data: data sizes differ");
|
---|
627 | LOG_INFO("data size (before) = " << dataSize);
|
---|
628 | LOG_INFO("data size (after) = " << varDataSize);
|
---|
629 | }
|
---|
630 | }
|
---|
631 | } else {
|
---|
632 | // skip data
|
---|
633 | setReadPosition(dataSize, ios_base::cur);
|
---|
634 | if (isVariableDataSize()) {
|
---|
635 | setReadPosition(dataSize, ios_base::cur);
|
---|
636 | }
|
---|
637 | }
|
---|
638 |
|
---|
639 | ////////////////////////////////////////
|
---|
640 | // check how many bytes were read/skipped
|
---|
641 | int64_t positionDifference = getReadPosition() - initialPosition;
|
---|
642 | if (positionDifference != recordSize) {
|
---|
643 | LOG_WARN("should be read : " << recordSize << " [bytes]");
|
---|
644 | LOG_WARN("was actually read: " << positionDifference << " [bytes]");
|
---|
645 | }
|
---|
646 | return true;
|
---|
647 | }
|
---|
648 |
|
---|
649 | bool DbiteFile::readRecordBackward(road_time_t & time, road_timerange_t & timeRange, char * buffer, size_t & bufferSize)
|
---|
650 | {
|
---|
651 | int64_t initialPosition = getReadPosition();
|
---|
652 | LOG_TRACE("initial position = " << initialPosition);
|
---|
653 |
|
---|
654 | size_t dataSize = 0;
|
---|
655 | size_t recordSize = sizeof(time) + sizeof(timeRange);
|
---|
656 | if (isVariableDataSize()) {
|
---|
657 | recordSize += 2 * sizeof(VariableDataSizeT);
|
---|
658 |
|
---|
659 | // go back sizeof(VariableDataSizeT)
|
---|
660 | setReadPosition(initialPosition - sizeof(VariableDataSizeT));
|
---|
661 |
|
---|
662 | // read VariableDataSizeT
|
---|
663 | VariableDataSizeT readVarDataSize = 0;
|
---|
664 | read((char *)(&readVarDataSize), sizeof(VariableDataSizeT));
|
---|
665 | dataSize = static_cast<size_t>(readVarDataSize);
|
---|
666 | LOG_DEBUG("variable record size = " << dataSize);
|
---|
667 | } else {
|
---|
668 | dataSize = getRecordSize();
|
---|
669 | }
|
---|
670 | // recordSize = sizeof(time) + sizeof(timeRange) + dataSize + [2 * sizeof(VariableDataSizeT)]
|
---|
671 | recordSize += dataSize;
|
---|
672 |
|
---|
673 | // go back to the beginning of the previous record
|
---|
674 | setReadPosition(initialPosition - recordSize);
|
---|
675 |
|
---|
676 | bool readResult = false;
|
---|
677 | try {
|
---|
678 | // read forward
|
---|
679 | readResult = readRecordForward(time, timeRange, buffer, bufferSize);
|
---|
680 | } catch (DbiteException & e) {
|
---|
681 | setReadPosition(initialPosition);
|
---|
682 | throw e;
|
---|
683 | }
|
---|
684 |
|
---|
685 | // go back to the beginning of the previous record
|
---|
686 | setReadPosition(initialPosition - recordSize);
|
---|
687 | return readResult;
|
---|
688 | }
|
---|
689 |
|
---|
690 | bool DbiteFile::writeRecord(const road_time_t & time, const road_timerange_t & timeRange, const char * data, const size_t dataSize)
|
---|
691 | {
|
---|
692 | LOG_DEBUG("writing record:" << "\t"
|
---|
693 | << "time=" << time << "\t"
|
---|
694 | << "time range=" << timeRange << "\t"
|
---|
695 | << "data size=" << dataSize);
|
---|
696 | checkFileOpen();
|
---|
697 |
|
---|
698 | if (isVariableDataSize()) {
|
---|
699 | if (dataSize > static_cast<size_t>(numeric_limits<VariableDataSizeT>::max())) {
|
---|
700 | LOG_ERROR("variable data size too big");
|
---|
701 | throw DbiteException("variable data size too big");
|
---|
702 | }
|
---|
703 | }
|
---|
704 |
|
---|
705 | int64_t initialPosition = getWritePosition();
|
---|
706 | LOG_TRACE("getFileSize() = " << getFileSize());
|
---|
707 | LOG_TRACE("getWritePosition() = " << getWritePosition());
|
---|
708 | assert(initialPosition == getFileSize());
|
---|
709 |
|
---|
710 | size_t writtenBytes = 0;
|
---|
711 | try {
|
---|
712 | // write acquisition time, acquisition time range, data
|
---|
713 | // if variable size, then write record size before and after data
|
---|
714 |
|
---|
715 | write((const char *)(&time), sizeof(time));
|
---|
716 | writtenBytes += sizeof(time);
|
---|
717 |
|
---|
718 | write((const char *)(&timeRange), sizeof(timeRange));
|
---|
719 | writtenBytes += sizeof(timeRange);
|
---|
720 |
|
---|
721 | if (isVariableDataSize()) {
|
---|
722 | write((const char *)(&dataSize), sizeof(VariableDataSizeT));
|
---|
723 | writtenBytes += sizeof(VariableDataSizeT);
|
---|
724 | }
|
---|
725 | write((const char *)(data), dataSize);
|
---|
726 | writtenBytes += dataSize;
|
---|
727 |
|
---|
728 | if (isVariableDataSize()) {
|
---|
729 | write((const char *)(&dataSize), sizeof(VariableDataSizeT));
|
---|
730 | writtenBytes += sizeof(VariableDataSizeT);
|
---|
731 | }
|
---|
732 | } catch (DbiteException & e) {
|
---|
733 | LOG_ERROR("Dbite exception: " << e.what());
|
---|
734 | LOG_INFO("restoring initial write position");
|
---|
735 |
|
---|
736 | // on error, go back to record start
|
---|
737 | setWritePosition(- (int64_t) writtenBytes, ios_base::cur);
|
---|
738 | throw e;
|
---|
739 | }
|
---|
740 |
|
---|
741 | // check how many bytes were written
|
---|
742 | int64_t finalPosition = getWritePosition();
|
---|
743 | int64_t positionDifference = finalPosition - initialPosition;
|
---|
744 | LOG_TRACE("position difference = " << positionDifference);
|
---|
745 | size_t totalRecordSize = dataSize + sizeof(time) + sizeof(timeRange);
|
---|
746 |
|
---|
747 | setFileSize(finalPosition); // FIXME: possible loss of data, conversion int64_t -> FileSizeT
|
---|
748 | setRecordCount(getRecordCount() + 1);
|
---|
749 | setTimeMin(min(getTimeMin(), time));
|
---|
750 | setTimeMax(max(getTimeMax(), time));
|
---|
751 |
|
---|
752 | if (positionDifference != totalRecordSize) {
|
---|
753 | LOG_WARN("should be written : " << totalRecordSize << " [bytes]");
|
---|
754 | LOG_WARN("was actually written: " << positionDifference << " [bytes]");
|
---|
755 | }
|
---|
756 | return true;
|
---|
757 | }
|
---|
758 |
|
---|
759 | void DbiteFile::read(fstream::char_type * s, streamsize n)
|
---|
760 | {
|
---|
761 | mFile.read(s, n);
|
---|
762 | if (!mFile) {
|
---|
763 | LOG_ERROR("cannot read data");
|
---|
764 | throw DbiteException("cannot read data");
|
---|
765 | }
|
---|
766 | }
|
---|
767 |
|
---|
768 | void DbiteFile::write(const fstream::char_type * s, streamsize n)
|
---|
769 | {
|
---|
770 | mFile.write(s, n);
|
---|
771 | if (!mFile) {
|
---|
772 | LOG_ERROR("cannot write data");
|
---|
773 | throw DbiteException("cannot write data");
|
---|
774 | }
|
---|
775 | }
|
---|
776 |
|
---|
777 | bool DbiteFile::isEndOfFile()
|
---|
778 | {
|
---|
779 | return mFile.eof();
|
---|
780 | }
|
---|
781 |
|
---|
782 | void DbiteFile::checkFileOpen()
|
---|
783 | {
|
---|
784 | if (!isOpen()) {
|
---|
785 | string errorMessage = "file is not open";
|
---|
786 | LOG_WARN(errorMessage);
|
---|
787 | throw DbiteException(errorMessage.c_str());
|
---|
788 | }
|
---|
789 | }
|
---|
790 |
|
---|
791 | bool doesFileExist(const string & path)
|
---|
792 | {
|
---|
793 | bool fileExist = false;
|
---|
794 | fstream f(path.c_str(), ios_base::in);
|
---|
795 | if (f.good()) {
|
---|
796 | fileExist = true;
|
---|
797 | }
|
---|
798 | f.close();
|
---|
799 | return fileExist;
|
---|
800 | }
|
---|