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panda/src/express/reversedNumericData.h

Go to the documentation of this file.

// Filename: reversedNumericData.h
// Created by:  drose (09May01)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////

#ifndef REVERSEDNUMERICDATA_H
#define REVERSEDNUMERICDATA_H

#include <pandabase.h>

#include <string.h>  // for memcpy()

// The maximum size of any numeric data type.  At present, this is
// int64 and float64.
static const int max_numeric_size = 8;

////////////////////////////////////////////////////////////////////
//       Class : ReversedNumericData
// Description : NativeNumericData and ReversedNumericData work
//               together to provide a sneaky interface for
//               automatically byte-swapping numbers, when necessary,
//               to transparency support big-endian and little-endian
//               architectures.
//
//               Both of these classes provide interfaces that accept
//               a pointer to a numeric variable and the size of the
//               number, and they can append that data to the end of a
//               string, or memcpy it into another location.
//
//               The difference is that NativeNumericData simply
//               passes everything through unchanged, while
//               ReversedNumericData always byte-swaps everything.
//               Otherwise, they have the same interface.
//
//               The transparent part comes from LittleEndian and
//               BigEndian, which are typedeffed to be one of these or
//               the other, according to the machine's architecture.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDAEXPRESS ReversedNumericData {
public:
  INLINE ReversedNumericData(const void *data, size_t length);
  INLINE ReversedNumericData(const void *data, size_t start, size_t length);

  INLINE void store_value(void *dest, size_t length) const;
  INLINE const void *get_data() const;

private:
  void reverse_assign(const char *source, size_t length);
  char _data[max_numeric_size];
};

#include "reversedNumericData.I"

#endif

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