asner.cxx

开源代码的pwlib的1.10.0版本,使用openh323的1.18.0版本毕备

  /*
   * The first two subidentifiers are encoded into the first component
   * with the value (X * 40) + Y, where:
   *  X is the value of the first subidentifier.
   *  Y is the value of the second subidentifier.
   */
  subId = value[1];
  if (subId < 40) {
    value[0] = 0;
    value[1] = subId;
  }
  else if (subId < 80) {
    value[0] = 1;
    value[1] = subId-40;
  }
  else {
    value[0] = 2;
    value[1] = subId-80;
  }

  return TRUE;
}


void PASN_ObjectId::CommonEncode(PBYTEArray & encodecObjectId) const
{
  PINDEX length = value.GetSize();
  const unsigned * objId = value;

  if (length < 2) {
    // Thise case is really illegal, but we have to do SOMETHING
    encodecObjectId.SetSize(0);
    return;
  }

  unsigned subId = (objId[0] * 40) + objId[1];
  objId += 2;

  PINDEX outputPosition = 0;

  while (--length > 0) {
    if (subId < 128)
      encodecObjectId[outputPosition++] = (BYTE)subId;
    else {
      unsigned mask = 0x7F; /* handle subid == 0 case */
      int bits = 0;

      /* testmask *MUST* !!!! be of an unsigned type */
      unsigned testmask = 0x7F;
      int      testbits = 0;
      while (testmask != 0) {
        if (subId & testmask) {  /* if any bits set */
          mask = testmask;
          bits = testbits;
        }
        testmask <<= 7;
        testbits += 7;
      }

      /* mask can't be zero here */
      while (mask != 0x7F) {
        /* fix a mask that got truncated above */
        if (mask == 0x1E00000)
          mask = 0xFE00000;

        encodecObjectId[outputPosition++] = (BYTE)(((subId & mask) >> bits) | 0x80);

        mask >>= 7;
        bits -= 7;
      }

      encodecObjectId[outputPosition++] = (BYTE)(subId & mask);
    }

    if (length > 1)
      subId = *objId++;
  }
}


PINDEX PASN_ObjectId::GetDataLength() const
{
  PBYTEArray dummy;
  CommonEncode(dummy);
  return dummy.GetSize();
}


BOOL PASN_ObjectId::Decode(PASN_Stream & strm)
{
  return strm.ObjectIdDecode(*this);
}


void PASN_ObjectId::Encode(PASN_Stream & strm) const
{
  strm.ObjectIdEncode(*this);
}


///////////////////////////////////////////////////////////////////////

PASN_BitString::PASN_BitString(unsigned nBits, const BYTE * buf)
  : PASN_ConstrainedObject(UniversalBitString, UniversalTagClass),
    totalBits(nBits),
    bitData((totalBits+7)/8)
{
  if (buf != NULL)
    memcpy(bitData.GetPointer(), buf, bitData.GetSize());
}


PASN_BitString::PASN_BitString(unsigned tag, TagClass tagClass, unsigned nBits)
  : PASN_ConstrainedObject(tag, tagClass),
    totalBits(nBits),
    bitData((totalBits+7)/8)
{
}


PASN_BitString::PASN_BitString(const PASN_BitString & other)
  : PASN_ConstrainedObject(other),
    bitData(other.bitData, other.bitData.GetSize())
{
  totalBits = other.totalBits;
}


PASN_BitString & PASN_BitString::operator=(const PASN_BitString & other)
{
  PASN_ConstrainedObject::operator=(other);
  totalBits = other.totalBits;
  bitData = PBYTEArray(other.bitData, other.bitData.GetSize());
  return *this;
}


void PASN_BitString::SetData(unsigned nBits, const PBYTEArray & bytes)
{
  if ((PINDEX)nBits >= MaximumStringSize)
    return;

  bitData = bytes;
  SetSize(nBits);
}


void PASN_BitString::SetData(unsigned nBits, const BYTE * buf, PINDEX size)
{
  if ((PINDEX)nBits >= MaximumStringSize)
    return;

  if (size == 0)
    size = (nBits+7)/8;
  memcpy(bitData.GetPointer(size), buf, size);
  SetSize(nBits);
}


BOOL PASN_BitString::SetSize(unsigned nBits)
{
  if (!CheckByteOffset(nBits))
    return FALSE;

  if (constraint == Unconstrained)
    totalBits = nBits;
  else if (totalBits < (unsigned)lowerLimit) {
    if (lowerLimit < 0)
      return FALSE;
    totalBits = lowerLimit;
  } else if ((unsigned)totalBits > upperLimit) {
    if (upperLimit > (unsigned)MaximumSetSize)
      return FALSE;
    totalBits = upperLimit;
  } else
    totalBits = nBits;
  return bitData.SetSize((totalBits+7)/8);
}


bool PASN_BitString::operator[](PINDEX bit) const
{
  if ((unsigned)bit < totalBits)
    return (bitData[bit>>3] & (1 << (7 - (bit&7)))) != 0;
  return FALSE;
}


void PASN_BitString::Set(unsigned bit)
{
  if (bit < totalBits)
    bitData[(PINDEX)(bit>>3)] |= 1 << (7 - (bit&7));
}


void PASN_BitString::Clear(unsigned bit)
{
  if (bit < totalBits)
    bitData[(PINDEX)(bit>>3)] &= ~(1 << (7 - (bit&7)));
}


void PASN_BitString::Invert(unsigned bit)
{
  if (bit < totalBits)
    bitData[(PINDEX)(bit>>3)] ^= 1 << (7 - (bit&7));
}


PObject::Comparison PASN_BitString::Compare(const PObject & obj) const
{
  PAssert(PIsDescendant(&obj, PASN_BitString), PInvalidCast);
  const PASN_BitString & other = (const PASN_BitString &)obj;
  if (totalBits < other.totalBits)
    return LessThan;
  if (totalBits > other.totalBits)
    return GreaterThan;
  return bitData.Compare(other.bitData);
}


PObject * PASN_BitString::Clone() const
{
  PAssert(IsClass(PASN_BitString::Class()), PInvalidCast);
  return new PASN_BitString(*this);
}


void PASN_BitString::PrintOn(ostream & strm) const
{
  int indent = strm.precision() + 2;
  _Ios_Fmtflags flags = strm.flags();

  if (totalBits > 128)
    strm << "Hex {\n"
         << hex << setfill('0') << resetiosflags(ios::floatfield) << setiosflags(ios::fixed)
         << setw(16) << setprecision(indent) << bitData
         << dec << setfill(' ') << resetiosflags(ios::floatfield)
         << setw(indent-1) << "}";
  else if (totalBits > 32)
    strm << "Hex:"
         << hex << setfill('0') << resetiosflags(ios::floatfield) << setiosflags(ios::fixed)
         << setprecision(2) << setw(16) << bitData
         << dec << setfill(' ') << resetiosflags(ios::floatfield);
  else {
    BYTE mask = 0x80;
    PINDEX offset = 0;
    for (unsigned i = 0; i < totalBits; i++) {
      strm << ((bitData[offset]&mask) != 0 ? '1' : '0');
      mask >>= 1;
      if (mask == 0) {
        mask = 0x80;
        offset++;
      }
    }
  }

  strm.flags(flags);
}


void PASN_BitString::SetConstraintBounds(ConstraintType type, int lower, unsigned upper)
{
  if (lower < 0)
    return;

  PASN_ConstrainedObject::SetConstraintBounds(type, lower, upper);
  SetSize(GetSize());
}


PString PASN_BitString::GetTypeAsString() const
{
  return "Bit String";
}


PINDEX PASN_BitString::GetDataLength() const
{
  return (totalBits+7)/8 + 1;
}


BOOL PASN_BitString::Decode(PASN_Stream & strm)
{
  return strm.BitStringDecode(*this);
}


void PASN_BitString::Encode(PASN_Stream & strm) const
{
  strm.BitStringEncode(*this);
}


///////////////////////////////////////////////////////////////////////

PASN_OctetString::PASN_OctetString(const char * str, PINDEX size)
  : PASN_ConstrainedObject(UniversalOctetString, UniversalTagClass)
{
  if (str != NULL) {
    if (size == 0)
      size = ::strlen(str);
    SetValue((const BYTE *)str, size);
  }
}


PASN_OctetString::PASN_OctetString(unsigned tag, TagClass tagClass)
  : PASN_ConstrainedObject(tag, tagClass)
{
}


PASN_OctetString::PASN_OctetString(const PASN_OctetString & other)
  : PASN_ConstrainedObject(other),
    value(other.value, other.GetSize())
{
}


PASN_OctetString & PASN_OctetString::operator=(const PASN_OctetString & other)
{
  PASN_ConstrainedObject::operator=(other);
  value = PBYTEArray(other.value, other.GetSize());
  return *this;
}


PASN_OctetString & PASN_OctetString::operator=(const char * str)
{
  if (str == NULL)
    value.SetSize(lowerLimit);
  else
    SetValue((const BYTE *)str, strlen(str));
  return *this;
}


PASN_OctetString & PASN_OctetString::operator=(const PString & str)
{
  SetValue((const BYTE *)(const char *)str, str.GetSize()-1);
  return *this;
}


PASN_OctetString & PASN_OctetString::operator=(const PBYTEArray & arr)
{
  PINDEX len = arr.GetSize();
  if ((unsigned)len > upperLimit || (int)len < lowerLimit)
    SetValue(arr, len);
  else
    value = arr;
  return *this;
}


void PASN_OctetString::SetValue(const BYTE * data, PINDEX len)
{
  if ((unsigned)len > upperLimit)
    len = upperLimit;
  if (SetSize((int)len < lowerLimit ? lowerLimit : len))
    memcpy(value.GetPointer(), data, len);
}


PString PASN_OctetString::AsString() const
{
  if (value.IsEmpty())
    return PString();
  return PString((const char *)(const BYTE *)value, value.GetSize());
}


PObject::Comparison PASN_OctetString::Compare(const PObject & obj) const
{
  PAssert(PIsDescendant(&obj, PASN_OctetString), PInvalidCast);
  const PASN_OctetString & other = (const PASN_OctetString &)obj;
  return value.Compare(other.value);
}


PObject * PASN_OctetString::Clone() const
{
  PAssert(IsClass(PASN_OctetString::Class()), PInvalidCast);
  return new PASN_OctetString(*this);
}


void PASN_OctetString::PrintOn(ostream & strm) const
{
  int indent = strm.precision() + 2;
  _Ios_Fmtflags flags = strm.flags();

  strm << ' ' << value.GetSize() << " octets {\n"
       << hex << setfill('0') << resetiosflags(ios::floatfield)
       << setprecision(indent) << setw(16);

  if (value.GetSize() <= 32 || (flags&ios::floatfield) != ios::fixed)
    strm << value << '\n';
  else {
    PBYTEArray truncatedArray(value, 32);
    strm << truncatedArray << '\n'
         << setfill(' ')
         << setw(indent+4) << "...\n";
  }

  strm << dec << setfill(' ')
       << setw(indent-1) << "}";

  strm.flags(flags);
}


void PASN_OctetString::SetConstraintBounds(ConstraintType type, int lower, unsigned upper)
{
  if (lower < 0)
    return;

  PASN_ConstrainedObject::SetConstraintBounds(type, lower, upper);
  SetSize(GetSize());
}


PString PASN_OctetString::GetTypeAsString() const
{
  return "Octet String";
}


PINDEX PASN_OctetString::GetDataLength() const
{
  return value.GetSize();
}


BOOL PASN_OctetString::SetSize(PINDEX newSize)
{
  if (!CheckByteOffset(newSize, MaximumStringSize))
    return FALSE;

  if (constraint != Unconstrained) {
    if (newSize < (PINDEX)lowerLimit) {
      if (lowerLimit < 0)
        return FALSE;
      newSize = lowerLimit;
    } else if ((unsigned)newSize > upperLimit) {
      if (upperLimit > (unsigned)MaximumStringSize)
        return FALSE;
      newSize = upperLimit;
    }
  }

  return value.SetSize(newSize);
}


BOOL PASN_OctetString::Decode(PASN_Stream & strm)
{
  return strm.OctetStringDecode(*this);
}


void PASN_OctetString::Encode(PASN_Stream & strm) const
{
  strm.OctetStringEncode(*this);
}

///////////////////////////////////////////////////////////////////////

PASN_ConstrainedString::PASN_ConstrainedString(const char * canonical, PINDEX size,
                                               unsigned tag, TagClass tagClass)
  : PASN_ConstrainedObject(tag, tagClass)
{
  canonicalSet = canonical;
  canonicalSetSize = size;
  canonicalSetBits = CountBits(size);
  SetCharacterSet(canonicalSet, canonicalSetSize, Unconstrained);
}


PASN_ConstrainedString & PASN_ConstrainedString::operator=(const char * str)
{
  if (str == NULL)
    str = "";

  PStringStream newValue;

  PINDEX len = strlen(str);

  // Can't copy any more characters than the upper constraint
  if ((unsigned)len > upperLimit)
    len = upperLimit;

  // Now copy individual characters, if they are in character set constraint
  for (PINDEX i = 0; i < len; i++) {
    PINDEX sz = characterSet.GetSize();
    if (sz == 0 || memchr(characterSet, str[i], sz) != NULL)
      newValue << str[i];
  }

  // Make sure string meets minimum length constraint
  while ((int)len < lowerLimit) {
    newValue << characterSet[0];
    len++;
  }

  value = newValue;
  value.MakeMinimumSize();
  return *this;
}


void PASN_ConstrainedString::SetCharacterSet(ConstraintType ctype, const char * set)
{
  SetCharacterSet(set, strlen(set), ctype);
}


void PASN_ConstrainedString::SetCharacterSet(ConstraintType ctype, unsigned firstChar, unsigned lastChar)