gsm_sms_codec.c

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// *************************************************************************
// * GSM TA/ME library
// *
// * File:    gsm_sms_codec.cc
// *
// * Purpose: Coder and Encoder for SMS TPDUs
// *
// * Author:  Peter Hofmann ([e-mail])
// *
// * Created: 17.5.1999
// *************************************************************************

#ifdef HAVE_CONFIG_H
#include <gsm_config.h>
#endif
#include <gsmlib/gsm_nls.h>
#include <gsmlib/gsm_sysdep.h>
#include <gsmlib/gsm_sms_codec.h>
#include <gsmlib/gsm_util.h>
#include <time.h>
#include <strstream>
#include <iomanip>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <string>
using namespace std;
using namespace gsmlib;

// Address members

Address::Address(string number) : _plan(ISDN_Telephone)
{
  number = removeWhiteSpace(number);
  if (number.length() > 0 && number[0] == '+')
  {
    _type = International;
    _number = number.substr(1, number.length() - 1);
  }
  else
  {
    _type = Unknown;
    _number = number;
  }
}

string Address::toString() const
{
  if (_type == International)
    return "+" + _number;
  else
    return _number;
}

bool gsmlib::operator<(const Address &x, const Address &y)
{
  // normalize numbers according to the following two rules:
  // - prepend "+" if international number
  // - append 0s to the shorter number so that both numbers have equal length
  string xnumber = x._number;
  string ynumber = y._number;
  static string twenty0s = "00000000000000000000";

  if (x._type == Address::International) xnumber = "+" + xnumber;
  if (y._type == Address::International) ynumber = "+" + ynumber;
  
  while (xnumber.length() != ynumber.length())
    if (xnumber.length() < ynumber.length())
    {
      int diff = ynumber.length() - xnumber.length();
      xnumber += twenty0s.substr(0, (diff > 20 ? 20 : diff));
    }
    else
    {
      int diff = xnumber.length() - ynumber.length();
      ynumber += twenty0s.substr(0, (diff > 20 ? 20 : diff));
    }

  return xnumber < ynumber;
}

bool gsmlib::operator==(const Address &x, const Address &y)
{
  return x._number == y._number && x._plan == y._plan;
}

// Timestamp members

bool Timestamp::empty() const
{
  return _year == 0 && _month == 0 && _day == 0 && _hour == 0 && 
    _minute == 0 && _seconds == 0 && _timeZoneMinutes == 0;
}

string Timestamp::toString(bool appendTimeZone) const
{
  short timeZoneMinutes = _timeZoneMinutes;
  short timeZoneHours = timeZoneMinutes / 60;
  timeZoneMinutes %= 60;

  // format date and time in a locale-specific way
  struct tm t;
  t.tm_sec = _seconds;
  t.tm_min = _minute;
  t.tm_hour = _hour;
  t.tm_mon = _month - 1;
  // year 2000 heuristics, SMSs cannot be older than start of GSM network
  t.tm_year = _year < 80 ? _year + 100 : _year;
  t.tm_mday = _day;
  t.tm_isdst = -1;
  t.tm_yday = 0;
  t.tm_wday = 0;
  
#ifdef BROKEN_STRFTIME
  char formattedTime[1024];
  strftime(formattedTime, 1024, "%x %X", &t);
#else
  int formattedTimeSize = strftime(NULL, INT_MAX, "%x %X", &t) + 1;
  char *formattedTime = (char*)alloca(sizeof(char) * formattedTimeSize);
  strftime(formattedTime, formattedTimeSize, "%x %X", &t);
#endif

  if (! appendTimeZone)
    return formattedTime;

  ostrstream os;
  os << formattedTime << " (" << (_negativeTimeZone ? '-' : '+')
     << setfill('0') << setw(2) << timeZoneHours 
     << setw(2) << timeZoneMinutes << ')' << ends;
  char *ss = os.str();
  string result(ss);
  delete[] ss;
  return result;
}

bool gsmlib::operator<(const Timestamp &x, const Timestamp &y)
{
  // we don't take time zone info into account because
  // - it's more complicated to compute
  // - it might confuse the user for whom it's also too complicated
  if (x._year < y._year)
    return true;
  else if (x._year > y._year)
    return false;

  if (x._month < y._month)
    return true;
  else if (x._month > y._month)
    return false;

  if (x._day < y._day)
    return true;
  else if (x._day > y._day)
    return false;

  if (x._hour < y._hour)
    return true;
  else if (x._hour > y._hour)
    return false;

  if (x._minute < y._minute)
    return true;
  else if (x._minute > y._minute)
    return false;

  return x._seconds < y._seconds;
}

bool gsmlib::operator==(const Timestamp &x, const Timestamp &y)
{
  // we don't take time zone info in order to be consistent with operator<
  return x._year == y._year && x._month == y._month && x._day == y._day &&
    x._hour == y._hour && x._minute == y._minute && x._seconds == y._seconds;
}

// TimePeriod members

string TimePeriod::toString() const
{
  switch (_format)
  {
  case NotPresent:
    return _("not present");
  case Relative:
  {
    ostrstream os;
    if (_relativeTime <= 143)
      os << ((int)_relativeTime + 1) * 5 << _(" minutes");
    else if (_relativeTime <= 167)
      os << 12 * 60 + ((int)_relativeTime - 143) * 30 << _(" minutes");
    else if (_relativeTime <= 196)
      os << (int)_relativeTime - 166 << _(" days");
    else if (_relativeTime <= 143)
      os << (int)_relativeTime - 192 << _(" weeks");
    os << ends;
    char *ss = os.str();
    string result(ss);
    delete[] ss;
    return result;
  }
  case Absolute:
    return _absoluteTime.toString();
  default:
    return _("unknown");
  }
}

// DataCodingScheme members

string DataCodingScheme::toString() const
{
  string result;
  if (compressed()) result += _("compressed   ");
  if (messageWaitingIndication())
    switch (getMessageWaitingType())
    {
    case DCS_VOICEMAIL_MESSAGE_WAITING:
      result += _("voicemail message waiting");
      break;
    case DCS_FAX_MESSAGE_WAITING:
      result += _("fax message waiting");
      break;
    case DCS_ELECTRONIC_MAIL_MESSAGE_WAITING:
      result += _("electronic mail message waiting");
      break;
    case DCS_OTHER_MESSAGE_WAITING:
      result += _("other message waiting");
      break;
    }
  else
    switch (getAlphabet())
    {
    case DCS_DEFAULT_ALPHABET:
      result += _("default alphabet");
      break;
    case DCS_EIGHT_BIT_ALPHABET:
      result += _("8-bit alphabet");
      break;
    case DCS_SIXTEEN_BIT_ALPHABET:
      result += _("16-bit alphabet");
      break;
    case DCS_RESERVED_ALPHABET:
      result += _("reserved alphabet");
      break;
    }
  return result;
}

// SMSDecoder members

SMSDecoder::SMSDecoder(string pdu) : _bi(0), _septetStart(NULL)
{
  _p = new unsigned char[pdu.length() / 2];
  _op = _p;
  if (! hexToBuf(pdu, _p))
    throw GsmException(_("bad hexadecimal PDU format"), SMSFormatError);
  _maxop = _op + pdu.length() / 2;
}

void SMSDecoder::alignOctet()
{
  if (_bi != 0)
  {
    _bi = 0;
    ++_op;
  }
}
    
void SMSDecoder::alignSeptet()
{
  assert(_septetStart != NULL);
  while (((_op - _septetStart) * 8 + _bi) % 7 != 0) getBit();
}
    
unsigned char SMSDecoder::get2Bits()
{
  unsigned char result = getBit();
  return result | (getBit() << 1);
}

unsigned char SMSDecoder::getOctet()
{
  alignOctet();
  if (_op >= _maxop)
    throw GsmException(_("premature end of PDU"), SMSFormatError);
  return *_op++;
}

void SMSDecoder::getOctets(unsigned char* octets, unsigned short length)
{
  alignOctet();
  for (unsigned short i = 0; i < length; ++i)
  {
    if (_op >= _maxop)
      throw GsmException(_("premature end of PDU"), SMSFormatError);
    *octets++ = *_op++;
  }
}

string SMSDecoder::getSemiOctets(unsigned short length)
{
  string result;
  result.reserve(length);
  alignOctet();
  for (unsigned short i = 0; i < length; ++i)
  {
    if (_bi == 0)
    {
      if (_op >= _maxop)
        throw GsmException(_("premature end of PDU"), SMSFormatError);
      // bits 0..3 are most significant
      result += '0' + (*_op & 0xf);
      _bi = 4;
    }
    else
    {
      if (_op >= _maxop)
        throw GsmException(_("premature end of PDU"), SMSFormatError);
      // bits 4..7 are least significant, skip 0xf digit
      if ((*_op & 0xf0) != 0xf0)
        result += '0' + (*_op >> 4);
      _bi = 0;
      ++_op;
    }
  }
  alignOctet();
  return result;
}

unsigned long SMSDecoder::getSemiOctetsInteger(unsigned short length)
{
  unsigned long result = 0;
  alignOctet();
  for (unsigned short i = 0; i < length; ++i)
  {
    if (_bi == 0)
    {
      if (_op >= _maxop)
        throw GsmException(_("premature end of PDU"), SMSFormatError);
      // bits 0..3 are most significant
      result = result * 10 + (*_op & 0xf);
      _bi = 4;
    }
    else
    {
      if (_op >= _maxop)
        throw GsmException(_("premature end of PDU"), SMSFormatError);
      // bits 4..7 are least significant, skip 0xf digit
      if ((*_op & 0xf0) != 0xf0)
        result = result * 10 + (*_op >> 4);
      _bi = 0;