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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
// cFile.cpp
// Implements the cFile class providing an OS-independent abstraction of a file.
#include "Globals.h" // NOTE: MSVC stupidness requires this to be the same across all modules
#include "cFile.h"
/// Simple constructor - creates an unopened file object, use Open() to open / create a real file
cFile::cFile(void) :
#ifdef USE_STDIO_FILE
m_File(NULL)
#else
m_File(INVALID_HANDLE_VALUE)
#endif // USE_STDIO_FILE
{
// Nothing needed yet
}
/// Constructs and opens / creates the file specified, use IsOpen() to check for success
cFile::cFile(const char * iFileName, EMode iMode) :
#ifdef USE_STDIO_FILE
m_File(NULL)
#else
m_File(INVALID_HANDLE_VALUE)
#endif // USE_STDIO_FILE
{
Open(iFileName, iMode);
}
/// Auto-closes the file, if open
cFile::~cFile()
{
if (IsOpen())
{
Close();
}
}
bool cFile::Open(const char * iFileName, EMode iMode)
{
assert(!IsOpen()); // You should close the file before opening another one
if (IsOpen())
{
Close();
}
const char * Mode = NULL;
switch (iMode)
{
case fmRead: Mode = "rb"; break;
case fmWrite: Mode = "wb"; break;
case fmReadWrite: Mode = "ab+"; break;
default:
{
assert(!"Unhandled file mode");
return false;
}
}
m_File = fopen(iFileName, Mode);
return (m_File != NULL);
}
void cFile::Close(void)
{
assert(IsOpen()); // You should not close file objects that don't have an open file.
if (!IsOpen())
{
return;
}
fclose(m_File);
}
bool cFile::IsOpen(void) const
{
return (m_File != NULL);
}
bool cFile::IsEOF(void) const
{
assert(IsOpen());
if (!IsOpen())
{
// Unopened files behave as at EOF
return true;
}
return (feof(m_File) != 0);
}
/// Reads up to iNumBytes bytes into iBuffer, returns the number of bytes actually read, or -1 on failure; asserts if not open
int cFile::Read (void * iBuffer, int iNumBytes)
{
assert(IsOpen());
if (!IsOpen())
{
return -1;
}
return fread(iBuffer, 1, iNumBytes, m_File); // fread() returns the portion of Count parameter actually read, so we need to send iNumBytes as Count
}
/// Writes up to iNumBytes bytes from iBuffer, returns the number of bytes actually written, or -1 on failure; asserts if not open
int cFile::Write(const void * iBuffer, int iNumBytes)
{
assert(IsOpen());
if (!IsOpen())
{
return -1;
}
return fwrite(iBuffer, 1, iNumBytes, m_File); // fwrite() returns the portion of Count parameter actually written, so we need to send iNumBytes as Count
}
/// Seeks to iPosition bytes from file start, returns old position or -1 for failure
int cFile::Seek (int iPosition)
{
assert(IsOpen());
if (!IsOpen())
{
return -1;
}
if (fseek(m_File, iPosition, SEEK_SET) != 0)
{
return -1;
}
return ftell(m_File);
}
/// Returns the current position (bytes from file start)
int cFile::Tell (void) const
{
assert(IsOpen());
if (!IsOpen())
{
return -1;
}
return ftell(m_File);
}
|
