summaryrefslogtreecommitdiffstats
path: root/source/OSSupport/File.cpp
blob: 16ec00e16df4eac3dd5f245d08fa8e6217c69941 (plain) (blame)
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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366

// 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 "File.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 AString & 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 AString & 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 = "rb+"; break;
		default:
		{
			ASSERT(!"Unhandled file mode");
			return false;
		}
	}
	m_File = fopen( (FILE_IO_PREFIX + iFileName).c_str(), Mode);
	if ((m_File == NULL) && (iMode == fmReadWrite))
	{
		// Fix for MS not following C spec, opening "a" mode files for writing at the end only
		// The file open operation has been tried with "read update", fails if file not found
		// So now we know either the file doesn't exist or we don't have rights, no need to worry about file contents.
		// Simply re-open for read-writing, erasing existing contents:
		m_File = fopen( (FILE_IO_PREFIX + iFileName).c_str(), "wb+");
	}
	return (m_File != NULL);
}





void cFile::Close(void)
{
	if (!IsOpen())
	{
		// Closing an unopened file is a legal nop
		return;
	}

	fclose(m_File);
	m_File = NULL;
}





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
}





int cFile::Write(const void * iBuffer, int iNumBytes)
{
	ASSERT(IsOpen());
	
	if (!IsOpen())
	{
		return -1;
	}

	int res = fwrite(iBuffer, 1, iNumBytes, m_File);  // fwrite() returns the portion of Count parameter actually written, so we need to send iNumBytes as Count
	return res;
}





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);
}






int cFile::Tell (void) const
{
	ASSERT(IsOpen());
	
	if (!IsOpen())
	{
		return -1;
	}
	
	return ftell(m_File);
}





int cFile::GetSize(void) const
{
	ASSERT(IsOpen());
	
	if (!IsOpen())
	{
		return -1;
	}
	
	int CurPos = ftell(m_File);
	if (CurPos < 0)
	{
		return -1;
	}
	if (fseek(m_File, 0, SEEK_END) != 0)
	{
		return -1;
	}
	int res = ftell(m_File);
	if (fseek(m_File, CurPos, SEEK_SET) != 0)
	{
		return -1;
	}
	return res;
}





int cFile::ReadRestOfFile(AString & a_Contents)
{
	ASSERT(IsOpen());
	
	if (!IsOpen())
	{
		return -1;
	}
	
	int DataSize = GetSize() - Tell();
	
	// HACK: This depends on the internal knowledge that AString's data() function returns the internal buffer directly
	a_Contents.assign(DataSize, '\0');
	return Read((void *)a_Contents.data(), DataSize);
}





bool cFile::Exists(const AString & a_FileName)
{
	cFile test(a_FileName, fmRead);
	return test.IsOpen();
}





bool cFile::Delete(const AString & a_FileName)
{
	return (remove(a_FileName.c_str()) == 0);
}





bool cFile::Rename(const AString & a_OrigFileName, const AString & a_NewFileName)
{
	return (rename(a_OrigFileName.c_str(), a_NewFileName.c_str()) == 0);
}





bool cFile::Copy(const AString & a_SrcFileName, const AString & a_DstFileName)
{
	#ifdef _WIN32
		return (CopyFile(a_SrcFileName.c_str(), a_DstFileName.c_str(), true) != 0);
	#else
		// Other OSs don't have a direct CopyFile equivalent, do it the harder way:
		ifstream src(a_SrcFileName, ios::binary);
		ofstream dst(a_DstFileName, ios::binary);
		if (dst.good())
		{
			dst << src.rdbuf();
			return true;
		}
		else
		{
			return false;
		}
	#endif
}





bool cFile::IsFolder(const AString & a_Path)
{
	#ifdef _WIN32
	DWORD FileAttrib = GetFileAttributes(a_Path.c_str());
	return ((FileAttrib != INVALID_FILE_ATTRIBUTES) && ((FileAttrib & FILE_ATTRIBUTE_DIRECTORY) != 0));
	#else
	struct stat st;
	return ((stat(a_Path.c_str(), &st) == 0) && S_ISDIR(st.st_mode));
	#endif
}





bool cFile::IsFile(const AString & a_Path)
{
	#ifdef _WIN32
	DWORD FileAttrib = GetFileAttributes(a_Path.c_str());
	return ((FileAttrib != INVALID_FILE_ATTRIBUTES) && ((FileAttrib & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE)) == 0));
	#else
	struct stat st;
	return ((stat(a_Path.c_str(), &st) == 0) && S_ISREG(st.st_mode));
	#endif
}





int cFile::GetSize(const AString & a_FileName)
{
	struct stat st;
	if (stat(a_FileName.c_str(), &st) == 0)
	{
		return st.st_size;
	}
	return -1;
}





int cFile::Printf(const char * a_Fmt, ...)
{
	AString buf;
	va_list args;
	va_start(args, a_Fmt);
	AppendVPrintf(buf, a_Fmt, args);
	va_end(args);
	return Write(buf.c_str(), buf.length());
}