osutils.cxx

mgcp协议源代码。支持多种编码：g711

  // Parse the option specification
  optionLetters = "";
  optionNames.SetSize(0);
  PIntArray canHaveOptionString;

  PINDEX codeCount = 0;
  while (*spec != '\0') {
    if (*spec == '-')
      optionLetters += ' ';
    else
      optionLetters += *spec++;
    if (*spec == '-') {
      const char * base = ++spec;
      while (*spec != '\0' && *spec != '.' && *spec != ':' && *spec != ';')
        spec++;
      optionNames[codeCount] = PString(base, spec-base);
      if (*spec == '.')
        spec++;
    }
    if (*spec == ':' || *spec == ';') {
      canHaveOptionString.SetSize(codeCount+1);
      canHaveOptionString[codeCount] = *spec == ':' ? 2 : 1;
      spec++;
    }
    codeCount++;
  }

  // Clear and reset size of option information
  optionCount.SetSize(0);
  optionCount.SetSize(codeCount);
  optionString.SetSize(0);
  optionString.SetSize(codeCount);

  // Clear parameter indexes
  parameterIndex.SetSize(0);
  shift = 0;

  // Now work through the arguments and split out the options
  PINDEX param = 0;
  BOOL hadMinusMinus = FALSE;
  while (arg < argumentArray.GetSize()) {
    const PString & argStr = argumentArray[arg];
    if (hadMinusMinus || argStr[0] != '-' || argStr[1] == '\0') {
      // have a parameter string
      parameterIndex.SetSize(param+1);
      parameterIndex[param++] = arg;
    }
    else if (optionsBeforeParams && parameterIndex.GetSize() > 0)
      break;
    else if (argStr == "--") // ALL remaining args are parameters not options
      hadMinusMinus = TRUE;
    else if (argStr[1] == '-')
      ParseOption(optionNames.GetValuesIndex(argStr.Mid(2)), 0, arg, canHaveOptionString);
    else {
      for (PINDEX i = 1; i < argStr.GetLength(); i++)
        if (ParseOption(optionLetters.Find(argStr[i]), i+1, arg, canHaveOptionString))
          break;
    }

    arg++;
  }

  return param > 0;
}


BOOL PArgList::ParseOption(PINDEX idx, PINDEX offset, PINDEX & arg,
                           const PIntArray & canHaveOptionString)
{
  if (idx == P_MAX_INDEX) {
    UnknownOption(argumentArray[arg]);
    return FALSE;
  }

  optionCount[idx]++;
  if (canHaveOptionString[idx] == 0)
    return FALSE;

  if (!optionString[idx])
    optionString[idx] += '\n';

  if (offset != 0 &&
        (canHaveOptionString[idx] == 1 || argumentArray[arg][offset] != '\0')) {
    optionString[idx] += argumentArray[arg].Mid(offset);
    return TRUE;
  }

  if (++arg >= argumentArray.GetSize())
    return FALSE;

  optionString[idx] += argumentArray[arg];
  return TRUE;
}


PINDEX PArgList::GetOptionCount(char option) const
{
  return GetOptionCountByIndex(optionLetters.Find(option));
}


PINDEX PArgList::GetOptionCount(const char * option) const
{
  return GetOptionCountByIndex(optionNames.GetValuesIndex(PString(option)));
}


PINDEX PArgList::GetOptionCount(const PString & option) const
{
  return GetOptionCountByIndex(optionNames.GetValuesIndex(option));
}


PINDEX PArgList::GetOptionCountByIndex(PINDEX idx) const
{
  if (idx < optionCount.GetSize())
    return optionCount[idx];

  return 0;
}


PString PArgList::GetOptionString(char option, const char * dflt) const
{
  return GetOptionStringByIndex(optionLetters.Find(option), dflt);
}


PString PArgList::GetOptionString(const char * option, const char * dflt) const
{
  return GetOptionStringByIndex(optionNames.GetValuesIndex(PString(option)), dflt);
}


PString PArgList::GetOptionString(const PString & option, const char * dflt) const
{
  return GetOptionStringByIndex(optionNames.GetValuesIndex(option), dflt);
}


PString PArgList::GetOptionStringByIndex(PINDEX idx, const char * dflt) const
{
  if (idx < optionString.GetSize() && optionString.GetAt(idx) != NULL)
    return optionString[idx];

  if (dflt != NULL)
    return dflt;

  return PString();
}


PString PArgList::GetParameter(PINDEX num) const
{
  int idx = shift+(int)num;
  if (idx >= 0 && idx < (int)parameterIndex.GetSize())
    return argumentArray[parameterIndex[idx]];

  IllegalArgumentIndex(idx);
  return PString();
}


void PArgList::Shift(int sh) 
{
  shift += sh;
  if (shift < 0)
    shift = 0;
  else if (shift >= (int)parameterIndex.GetSize())
    shift = parameterIndex.GetSize() - 1;
}


void PArgList::IllegalArgumentIndex(PINDEX idx) const
{
  PError << "attempt to access undefined argument at index "
         << idx << endl;
}
 

void PArgList::UnknownOption(const PString & option) const
{
  PError << "unknown option \"" << option << "\"\n";
}


void PArgList::MissingArgument(const PString & option) const
{
  PError << "option \"" << option << "\" requires argument\n";
}


///////////////////////////////////////////////////////////////////////////////
// PConfigArgs

PConfigArgs::PConfigArgs(const PArgList & args)
  : PArgList(args),
    sectionName(config.GetDefaultSection()),
    negationPrefix("no-")
{
}


PINDEX PConfigArgs::GetOptionCount(char option) const
{
  PINDEX count;
  if ((count = PArgList::GetOptionCount(option)) > 0)
    return count;

  PString stropt = CharToString(option);
  if (stropt.IsEmpty())
    return 0;

  return GetOptionCount(stropt);
}


PINDEX PConfigArgs::GetOptionCount(const char * option) const
{
  return GetOptionCount(PString(option));
}


PINDEX PConfigArgs::GetOptionCount(const PString & option) const
{
  // if specified on the command line, use that option
  PINDEX count = PArgList::GetOptionCount(option);
  if (count > 0)
    return count;

  // if user has specified "no-option", then ignore config file
  if (PArgList::GetOptionCount(negationPrefix + option) > 0)
    return 0;

  return config.HasKey(sectionName, option) ? 1 : 0;
}


PString PConfigArgs::GetOptionString(char option, const char * dflt) const
{
  if (PArgList::GetOptionCount(option) > 0)
    return PArgList::GetOptionString(option, dflt);

  PString stropt = CharToString(option);
  if (stropt.IsEmpty()) {
    if (dflt != NULL)
      return dflt;
    return PString();
  }

  return GetOptionString(stropt, dflt);
}


PString PConfigArgs::GetOptionString(const char * option, const char * dflt) const
{
  return GetOptionString(PString(option), dflt);
}


PString PConfigArgs::GetOptionString(const PString & option, const char * dflt) const
{
  // if specified on the command line, use that option
  if (PArgList::GetOptionCount(option) > 0)
    return PArgList::GetOptionString(option, dflt);

  // if user has specified "no-option", then ignore config file
  if (PArgList::HasOption(negationPrefix + option)) {
    if (dflt != NULL)
      return dflt;
    return PString();
  }

  return config.GetString(sectionName, option, dflt != NULL ? dflt : "");
}


void PConfigArgs::Save(const PString & saveOptionName)
{
  if (PArgList::GetOptionCount(saveOptionName) == 0)
    return;

  config.DeleteSection(sectionName);

  for (PINDEX i = 0; i < optionCount.GetSize(); i++) {
    PString optionName = optionNames[i];
    if (optionCount[i] > 0 && optionName != saveOptionName) {
      if (optionString.GetAt(i) != NULL)
        config.SetString(sectionName, optionName, optionString[i]);
      else
        config.SetBoolean(sectionName, optionName, TRUE);
    }
  }
}


PString PConfigArgs::CharToString(char ch) const
{
  PINDEX index = optionLetters.Find(ch);
  if (index == P_MAX_INDEX)
    return PString();

  if (optionNames.GetAt(index) == NULL)
    return PString();

  return optionNames[index];
}


///////////////////////////////////////////////////////////////////////////////
// PProcess

static PProcess * PProcessInstance;
int PProcess::p_argc;
char ** PProcess::p_argv;
char ** PProcess::p_envp;

#ifndef P_PLATFORM_HAS_THREADS
static BOOL PProcessTerminating = FALSE;
#endif


PProcess::PProcess(const char * manuf, const char * name,
                           WORD major, WORD minor, CodeStatus stat, WORD build)
  : manufacturer(manuf), productName(name)
{
  PProcessInstance = this;
  terminationValue = 0;

  majorVersion = major;
  minorVersion = minor;
  status = stat;
  buildNumber = build;

  if (p_argv != 0 && p_argc > 0) {
    arguments.SetArgs(p_argc-1, p_argv+1);

    executableFile = PString(p_argv[0]);
    if (!PFile::Exists(executableFile))
      executableFile += ".exe";

    if (productName.IsEmpty())
      productName = executableFile.GetTitle().ToLower();
  }

  InitialiseProcessThread();

  Construct();
}


int PProcess::_main(void *)
{
  Main();
  return terminationValue;
}


void PProcess::PreInitialise(int c, char ** v, char ** e)
{
  p_argc = c;
  p_argv = v;
  p_envp = e;
}


PProcess & PProcess::Current()
{
  if (PProcessInstance == NULL) {
    cerr << "Catastrophic failure, PProcess::Current() = NULL!!\n";
#if defined(_MSC_VER) && defined(_DEBUG)
    __asm int 3;
#endif
    _exit(1);
  }
  return *PProcessInstance;
}


BOOL PProcess::IsInitialised()
{
  return PProcessInstance != NULL;
}


PObject::Comparison PProcess::Compare(const PObject & obj) const
{
  PAssert(obj.IsDescendant(PProcess::Class()), PInvalidCast);
  return productName.Compare(((const PProcess &)obj).productName);
}


void PProcess::Terminate()
{
#ifdef _WINDLL
  FatalExit(terminationValue);
#else
#ifndef P_PLATFORM_HAS_THREADS
  // Can only terminate process from the processes thread
  if (currentThread == this)
    exit(terminationValue);
  else
    PProcessTerminating = TRUE;
#else
  exit(terminationValue);
#endif
#endif
}


PString PProcess::GetThreadName() const
{
  return GetName(); 
}
 
 
void PProcess::SetThreadName(const PString & /*name*/)
{
}


PString PProcess::GetVersion(BOOL full) const
{
  const char * const statusLetter[NumCodeStatuses] =
    { "alpha", "beta", "pl" };
  return psprintf(full && buildNumber != 0 ? "%u.%u%s%u" : "%u.%u",
                majorVersion, minorVersion, statusLetter[status], buildNumber);
}


///////////////////////////////////////////////////////////////////////////////
// PThread

void PThread::PrintOn(ostream & strm) const
{
  PString name = GetThreadName();
  if (name.IsEmpty())
    name.sprintf("%s<%08x>", GetClass(), (int)this);
  strm << name;
}


PString PThread::GetThreadName() const
{
  return threadName; 
}
 
 
void PThread::SetThreadName(const PString & name)
{
  threadName = name; 
}


#ifndef P_PLATFORM_HAS_THREADS

void PThread::InitialiseProcessThread()
{
  basePriority = NormalPriority;  // User settable priority
  dynamicPriority = 0;            // Only thing running
  suspendCount = 0;               // Not suspended (would not be a good idea)
  ClearBlock();                   // No I/O blocking function
  status = Running;               // Thread is already running
  stackBase = NULL;
  link = this;
  ((PProcess*)this)->currentThread = this;
}


PThread::PThread(PINDEX stackSize,
                 AutoDeleteFlag deletion,
                 Priority priorityLevel,
                 const PString & name)
  : threadName(name)
{
  autoDelete = deletion == AutoDeleteThread;
  basePriority = priorityLevel;   // Threads user settable priority level
  dynamicPriority = 0;            // Run immediately
  suspendCount = 1;

  AllocateStack(stackSize);
  PAssert(stackBase != NULL, "Insufficient near heap for thread");

  status = Terminated; // Set to this so Restart() works
  Restart();
}


void PThread::Restart()
{
  if (status != Terminated) // Is already running
    return;

  ClearBlock();             // No I/O blocking function

  PThread * current = Current();
  link = current->link;
  current->link = this;

  status = Starting;
}


void PThread::Terminate()
{
  if (link == this || status == Terminated)
    return;   // Is only thread or already terminated

  if (status == Running) {
    status = Terminating;
    Yield(); // Never returns from here
  }

  PThread * prev = PThread::Current();
  while (prev->link != this)
    prev = prev->link;
  prev->link = link;   // Unlink it from the list
  status = Terminated;
}


void PThread::WaitForTermination() const
{
  while (!IsTerminated())