68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
// Filename: reversedNumericData.h
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// Created by: drose (09May01)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#ifndef REVERSEDNUMERICDATA_H
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#define REVERSEDNUMERICDATA_H
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#include "pandabase.h"
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#include <string.h> // for memcpy()
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// The maximum size of any numeric data type. At present, this is
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// int64 and float64.
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static const int max_numeric_size = 8;
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////////////////////////////////////////////////////////////////////
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// Class : ReversedNumericData
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// Description : NativeNumericData and ReversedNumericData work
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// together to provide a sneaky interface for
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// automatically byte-swapping numbers, when necessary,
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// to transparency support big-endian and little-endian
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// architectures.
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//
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// Both of these classes provide interfaces that accept
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// a pointer to a numeric variable and the size of the
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// number, and they can append that data to the end of a
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// string, or memcpy it into another location.
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//
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// The difference is that NativeNumericData simply
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// passes everything through unchanged, while
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// ReversedNumericData always byte-swaps everything.
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// Otherwise, they have the same interface.
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//
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// The transparent part comes from LittleEndian and
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// BigEndian, which are typedeffed to be one of these or
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// the other, according to the machine's architecture.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDAEXPRESS ReversedNumericData {
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public:
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INLINE ReversedNumericData(const void *data, size_t length);
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INLINE ReversedNumericData(const void *data, size_t start, size_t length);
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INLINE void store_value(void *dest, size_t length) const;
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INLINE const void *get_data() const;
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private:
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void reverse_assign(const char *source, size_t length);
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char _data[max_numeric_size];
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};
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#include "reversedNumericData.I"
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#endif
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