// Filename: streamReader.I
// Created by:  drose (04Aug02)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: StreamReader::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE StreamReader::
StreamReader(istream &in) :
  _in(&in),
  _owns_stream(false)
{
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::Constructor
//       Access: Published
//  Description: If owns_stream is true, the stream pointer will be
//               deleted when the StreamReader destructs.
////////////////////////////////////////////////////////////////////
INLINE StreamReader::
StreamReader(istream *in, bool owns_stream) :
  _in(in),
  _owns_stream(owns_stream)
{
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::Copy Constructor
//       Access: Published
//  Description: The copy constructor does not copy ownership of the
//               stream.
////////////////////////////////////////////////////////////////////
INLINE StreamReader::
StreamReader(const StreamReader &copy) :
  _in(copy._in),
  _owns_stream(false)
{
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::Copy Assignment Operator
//       Access: Published
//  Description: The copy constructor does not copy ownership of the
//               stream.
////////////////////////////////////////////////////////////////////
INLINE void StreamReader::
operator = (const StreamReader &copy) {
  if (_owns_stream) {
    delete _in;
  }
  _in = copy._in;
  _owns_stream = false;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::Destructor
//       Access: Published
//  Description:
////////////////////////////////////////////////////////////////////
INLINE StreamReader::
~StreamReader() {
  if (_owns_stream) {
    delete _in;
  }
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_istream
//       Access: Published
//  Description: Returns the stream in use.
////////////////////////////////////////////////////////////////////
INLINE istream *StreamReader::
get_istream() const {
  return _in;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_bool
//       Access: Published
//  Description: Extracts a boolean value.
////////////////////////////////////////////////////////////////////
INLINE bool StreamReader::
get_bool() {
  return (get_uint8() != 0);
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_int8
//       Access: Published
//  Description: Extracts a signed 8-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int8 StreamReader::
get_int8() {
  return (PN_int8)_in->get();
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_uint8
//       Access: Published
//  Description: Extracts an unsigned 8-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint8 StreamReader::
get_uint8() {
  return (PN_uint8)_in->get();
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_int16
//       Access: Published
//  Description: Extracts a signed 16-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int16 StreamReader::
get_int16() {
  PN_int16 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_int32
//       Access: Published
//  Description: Extracts a signed 32-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int32 StreamReader::
get_int32() {
  PN_int32 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_int64
//       Access: Published
//  Description: Extracts a signed 64-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int64 StreamReader::
get_int64() {
  PN_int64 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_uint16
//       Access: Published
//  Description: Extracts an unsigned 16-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint16 StreamReader::
get_uint16() {
  PN_uint16 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_uint32
//       Access: Published
//  Description: Extracts an unsigned 32-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint32 StreamReader::
get_uint32() {
  PN_uint32 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_uint64
//       Access: Published
//  Description: Extracts an unsigned 64-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint64 StreamReader::
get_uint64() {
  PN_uint64 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_float32
//       Access: Published
//  Description: Extracts a 32-bit single-precision floating-point
//               number.  Since this kind of float is not necessarily
//               portable across different architectures, special care
//               is required.
////////////////////////////////////////////////////////////////////
INLINE float StreamReader::
get_float32() {
  // For now, we assume the float format is portable across all
  // architectures we are concerned with.  If we come across one that
  // is different, we will have to convert.
  nassertr(sizeof(float) == 4, 0.0f);

  float readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_float64
//       Access: Published
//  Description: Extracts a 64-bit floating-point number.
////////////////////////////////////////////////////////////////////
INLINE PN_float64 StreamReader::
get_float64() {
  PN_float64 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  LittleEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_int16
//       Access: Published
//  Description: Extracts a signed big-endian 16-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int16 StreamReader::
get_be_int16() {
  PN_int16 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_int32
//       Access: Published
//  Description: Extracts a signed big-endian 32-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int32 StreamReader::
get_be_int32() {
  PN_int32 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_int64
//       Access: Published
//  Description: Extracts a signed big-endian 64-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_int64 StreamReader::
get_be_int64() {
  PN_int64 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_uint16
//       Access: Published
//  Description: Extracts an unsigned big-endian 16-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint16 StreamReader::
get_be_uint16() {
  PN_uint16 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_uint32
//       Access: Published
//  Description: Extracts an unsigned big-endian 32-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint32 StreamReader::
get_be_uint32() {
  PN_uint32 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_uint64
//       Access: Published
//  Description: Extracts an unsigned big-endian 64-bit integer.
////////////////////////////////////////////////////////////////////
INLINE PN_uint64 StreamReader::
get_be_uint64() {
  PN_uint64 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_float32
//       Access: Published
//  Description: Extracts a 32-bit single-precision big-endian
//               floating-point number.  Since this kind of float is
//               not necessarily portable across different
//               architectures, special care is required.
////////////////////////////////////////////////////////////////////
INLINE float StreamReader::
get_be_float32() {
  // For now, we assume the float format is portable across all
  // architectures we are concerned with.  If we come across one that
  // is different, we will have to convert.
  nassertr(sizeof(float) == 4, 0.0f);

  float readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}

////////////////////////////////////////////////////////////////////
//     Function: StreamReader::get_be_float64
//       Access: Published
//  Description: Extracts a 64-bit big-endian floating-point number.
////////////////////////////////////////////////////////////////////
INLINE PN_float64 StreamReader::
get_be_float64() {
  PN_float64 readval, retval;
  _in->read((char *)&readval, sizeof(readval));
  BigEndian s(&readval, 0, sizeof(readval));
  s.store_value(&retval, sizeof(retval));
  return retval;
}