src/r_timezone.cc

   1 ///
   2 /// \file       r_timezone.cc
   3 ///             Record parsing class for the timezone database.
   4 ///
   5
   6 /*
   7     Copyright (C) 2005-2010, Net Direct Inc. (http://www.netdirect.ca/)
   8     Copyright (C) 2008, Brian Edginton
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  18
  19     See the GNU General Public License in the COPYING file at the
  20     root directory of this project for more details.
  21 */
  22
  23 #include "r_timezone.h"
  24 #include "record-internal.h"
  25 #include "protostructs.h"
  26 #include "data.h"
  27 #include "time.h"
  28 #include "iconv.h"
  29 #include "debug.h"
  30 #include <ostream>
  31 #include <iomanip>
  32
  33 using namespace std;
  34 using namespace Barry::Protocol;
  35
  36 namespace Barry
  37 {
  38
  39 ///////////////////////////////////////////////////////////////////////////////
  40 // Timezone Class
  41
  42 // Timezone Field Codes
  43 #define TZFC_INDEX              0x01
  44 #define TZFC_NAME               0x02
  45 #define TZFC_OFFSET             0x03
  46 #define TZFC_DST                0x04
  47 #define TZFC_STARTMONTH         0x06
  48 #define TZFC_ENDMONTH           0x0B
  49 #define TZFC_TZTYPE             0x64
  50
  51 #define TZFC_END                0xffff
  52
  53 static FieldLink<Timezone> TimezoneFieldLinks[] = {
  54    { TZFC_NAME,   "Name",        0, 0, &Timezone::TimeZoneName, 0, 0, 0, 0, true },
  55    { TZFC_END,    "End of List", 0, 0, 0, 0, 0, 0, 0, false },
  56 };
  57
  58 Timezone::Timezone()
  59 {
  60         Clear();
  61 }
  62
  63 Timezone::~Timezone()
  64 {
  65 }
  66
  67 const unsigned char* Timezone::ParseField(const unsigned char *begin,
  68                                           const unsigned char *end,
  69                                           const IConverter *ic)
  70 {
  71         const CommonField *field = (const CommonField *) begin;
  72
  73         // advance and check size
  74         begin += COMMON_FIELD_HEADER_SIZE + btohs(field->size);
  75         if( begin > end )       // if begin==end, we are ok
  76                 return begin;
  77
  78         if( !btohs(field->size) )   // if field has no size, something's up
  79                 return begin;
  80
  81         if( field->type == TZFC_TZTYPE ) {
  82                 if( ( TZType = field->u.uint32 ) != 1 ) {
  83                         throw Error("Timezone::ParseField: Timezone Type is not valid");
  84                 }
  85                 return begin;
  86         }
  87
  88         // cycle through the type table
  89         for(    FieldLink<Timezone> *b = TimezoneFieldLinks;
  90                 b->type != TZFC_END;
  91                 b++ )
  92         {
  93                 if( b->type == field->type ) {
  94                         if( b->strMember ) {
  95                                 std::string &s = this->*(b->strMember);
  96                                 s = ParseFieldString(field);
  97                                 if( b->iconvNeeded && ic )
  98                                         s = ic->FromBB(s);
  99                                 return begin;   // done!
 100                         }
 101                 }
 102         }
 103
 104         switch( field->type )
 105         {
 106         case TZFC_INDEX:
 107                 Index = btohl(field->u.uint32);
 108                 return begin;
 109
 110         case TZFC_OFFSET:
 111                 Offset = btohs(field->u.int16);
 112                 if (Offset < 0) {
 113                         Offset =~ Offset;
 114                         Offset++;
 115                         OffsetFraction = Offset % 60;
 116                         Offset = Offset / 60;
 117                         Left = true;
 118                 } else {
 119                         OffsetFraction = Offset % 60;
 120                         Offset = Offset / 60;
 121                         Left = false;
 122                 }
 123                 return begin;
 124
 125         case TZFC_DST:
 126                 DSTOffset = btohl(field->u.uint32);
 127                 if (DSTOffset) {
 128                         UseDST = true;
 129                 }
 130                 return begin;
 131
 132         case TZFC_STARTMONTH:
 133                 StartMonth = btohl(field->u.uint32);
 134                 return begin;
 135
 136         case TZFC_ENDMONTH:
 137                 EndMonth = btohl(field->u.uint32);
 138                 return begin;
 139         }
 140
 141         // if still not handled, add to the Unknowns list
 142         UnknownField uf;
 143         uf.type = field->type;
 144         uf.data.assign((const char*)field->u.raw, btohs(field->size));
 145         Unknowns.push_back(uf);
 146
 147         // return new pointer for next field
 148         return begin;
 149 }
 150
 151 void Timezone::ParseHeader(const Data &data, size_t &offset)
 152 {
 153         // no header in Task records
 154 }
 155
 156 void Timezone::ParseFields(const Data &data, size_t &offset, const IConverter *ic)
 157 {
 158         const unsigned char *finish = ParseCommonFields(*this,
 159                 data.GetData() + offset, data.GetData() + data.GetSize(), ic);
 160         offset += finish - (data.GetData() + offset);
 161 }
 162
 163 void Timezone::Clear()
 164 {
 165         RecType = GetDefaultRecType();
 166         RecordId = 0;
 167
 168         TZType = 0;
 169         DSTOffset = 0;
 170         Index = 0;
 171         Offset = 0;
 172         OffsetFraction = 0;
 173         StartMonth = -1;
 174         EndMonth = -1;
 175         Left = false;
 176         UseDST = false;
 177
 178         TimeZoneName.clear();
 179
 180         Unknowns.clear();
 181 }
 182
 183 void Timezone::Dump(std::ostream &os) const
 184 {
 185         static const char *month[] = {
 186                         "Jan", "Feb", "Mar", "Apr", "May",
 187                         "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 188         };
 189
 190         os << "Task entry: 0x" << setbase(16) << RecordId
 191            << " (" << (unsigned int)RecType << ")\n";
 192
 193         // cycle through the type table
 194         for(    const FieldLink<Timezone> *b = TimezoneFieldLinks;
 195                 b->type != TZFC_END;
 196                 b++ )
 197         {
 198                 if( b->strMember ) {
 199                         const std::string &s = this->*(b->strMember);
 200                         if( s.size() )
 201                                 os << "       " << b->name << ": " << s << "\n";
 202                 }
 203         }
 204
 205         os << "      Index: 0x" <<setw(2) << Index << "\n";
 206         os << "     Offset: " << (Left ? "-" : "+") << setbase(10) << Offset << "." << OffsetFraction << "\n";
 207         os << "    Use DST: " << (UseDST ? "true" : "false") << "\n";
 208         if (UseDST) {
 209                 if ((StartMonth > 0) && (StartMonth < 11))
 210                                 os << "Start Month: " << month[StartMonth] << "\n";
 211                 else
 212                                 os << "Start Month: unknown (" << setbase(10) << StartMonth << ")\n";
 213                 if ((EndMonth > 0) && (EndMonth < 11))
 214                         os << "  End Month: " << month[EndMonth] << "\n";
 215                 else
 216                         os << "  End Month: unknown (" << setbase(10) << EndMonth << ")\n";
 217         }
 218
 219         os << Unknowns;
 220         os << "\n\n";
 221 }
 222
 223 }