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nativeNumericData.h
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file nativeNumericData.h
10 * @author drose
11 * @date 2001-05-09
12 */
13
14#ifndef NATIVENUMERICDATA_H
15#define NATIVENUMERICDATA_H
16
17#include "dtoolbase.h"
18#include "numeric_types.h"
19
20#include <string.h> // for memcpy()
21
22/**
23 * NativeNumericData and ReversedNumericData work together to provide a sneaky
24 * interface for automatically byte-swapping numbers, when necessary, to
25 * transparency support big-endian and little-endian architectures.
26 *
27 * Both of these classes provide interfaces that accept a pointer to a numeric
28 * variable and the size of the number, and they can append that data to the
29 * end of a string, or memcpy it into another location.
30 *
31 * The difference is that NativeNumericData simply passes everything through
32 * unchanged, while ReversedNumericData always byte-swaps everything.
33 * Otherwise, they have the same interface.
34 *
35 * The transparent part comes from LittleEndian and BigEndian, which are
36 * typedeffed to be one of these or the other, according to the machine's
37 * architecture.
38 */
39 class EXPCL_DTOOL_PRC NativeNumericData {
40 public:
41 INLINE NativeNumericData(const void *data, size_t length);
42 INLINE NativeNumericData(const void *data, size_t start, size_t length);
43
44 INLINE void store_value(void *dest, size_t length) const;
45 INLINE const void *get_data() const;
46
47 private:
48 const void *_source;
49};
50
51#include "nativeNumericData.I"
52
53#endif
NativeNumericData::get_data
const void * get_data() const
Returns the pointer to the first byte of the data, either reversed or nonreversed,...
Definition nativeNumericData.I:51
NativeNumericData::NativeNumericData
NativeNumericData(const void *data, size_t length)
This constructor accepts the address of a numeric variable, and its sizeof.
Definition nativeNumericData.I:18
NativeNumericData::store_value
void store_value(void *dest, size_t length) const
Copies the data, with byte reversal if appropriate, into the indicated numeric variable,...
Definition nativeNumericData.I:42
dtoolbase.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
nativeNumericData.I
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
numeric_types.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.