1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/*
* This code is based on Broken Sword 2.5 engine
*
* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
*
* Licensed under GNU GPL v2
*
*/
#ifndef SWORD25_PERSISTENCEBLOCK_H
#define SWORD25_PERSISTENCEBLOCK_H
// -----------------------------------------------------------------------------
// Includes
// -----------------------------------------------------------------------------
#include "sword25/kernel/common.h"
namespace Sword25 {
// -----------------------------------------------------------------------------
// Class definition
// -----------------------------------------------------------------------------
class PersistenceBlock {
public:
static uint GetSInt32Size() {
return sizeof(signed int) + sizeof(byte);
}
static uint GetUInt32Size() {
return sizeof(uint) + sizeof(byte);
}
static uint GetFloat32Size() {
return sizeof(float) + sizeof(byte);
}
static uint GetBoolSize() {
return sizeof(byte) + sizeof(byte);
}
static uint GetStringSize(const Common::String &String) {
return static_cast<uint>(sizeof(uint) + String.size() + sizeof(byte));
}
protected:
enum {
SINT_MARKER,
UINT_MARKER,
FLOAT_MARKER,
STRING_MARKER,
BOOL_MARKER,
BLOCK_MARKER
};
// -----------------------------------------------------------------------------
// Endianess Conversions
// -----------------------------------------------------------------------------
//
// Everything is stored in Little Endian
// Big Endian Systems will need to be byte swapped during both saving and reading of saved values
//
template<typename T>
static T ConvertEndianessFromSystemToStorage(T Value) {
if (IsBigEndian()) ReverseByteOrder(&Value);
return Value;
}
template<typename T>
static T ConvertEndianessFromStorageToSystem(T Value) {
if (IsBigEndian()) ReverseByteOrder(&Value);
return Value;
}
private:
static bool IsBigEndian() {
uint Dummy = 1;
byte *DummyPtr = reinterpret_cast<byte *>(&Dummy);
return DummyPtr[0] == 0;
}
template<typename T>
static void Swap(T &One, T &Two) {
T Temp = One;
One = Two;
Two = Temp;
}
static void ReverseByteOrder(void *Ptr) {
// Reverses the byte order of the 32-bit word pointed to by Ptr
byte *CharPtr = static_cast<byte *>(Ptr);
Swap(CharPtr[0], CharPtr[3]);
Swap(CharPtr[1], CharPtr[2]);
}
};
// -----------------------------------------------------------------------------
// Compile time asserts
// -----------------------------------------------------------------------------
#define CTASSERT(ex) typedef char ctassert_type[(ex) ? 1 : -1]
CTASSERT(sizeof(byte) == 1);
CTASSERT(sizeof(signed int) == 4);
CTASSERT(sizeof(uint) == 4);
CTASSERT(sizeof(float) == 4);
#undef CTASSERT
} // End of namespace Sword25
#endif
|
