1 rizwank 1.1 /*--------------------------------------------------------------------------
2 Trivial virtual file system for cabinet conformance test.
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3 rizwank 1.2 (C) 2005 Dan Kegel and Rizwan Kassim
4 LGPL License
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5 rizwank 1.1 --------------------------------------------------------------------------*/
6
7 #include "tvfs.h"
8 #include <string.h>
9
10 #define MAXFILES 10
11 #define MAXHANDLES 10
12 #define MAXFNAME 255
13 #define MAXFLEN 65536
14
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15 rizwank 1.4 #include <fcntl.h>
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16 rizwank 1.7 #include <stdlib.h>
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17 rizwank 1.4 #include <stdio.h>
18 #include <malloc.h>
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19 rizwank 1.8 #include <stdio.h>
20 #include <stdarg.h>
21
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22 rizwank 1.7 /*
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23 rizwank 1.8 #define TVFS_MAIN
24 #define TVFS_DEBUG
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25 rizwank 1.7 */
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26 rizwank 1.8
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27 rizwank 1.4 #define SEEK_SET 0
28 #define SEEK_CUR 1
29 #define SEEK_END 2
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30 rizwank 1.2
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31 rizwank 1.8 #ifndef _O_BINARY
32 #define _O_BINARY 0
33 #endif
34
35 #ifndef STANDALONE
36 #else
37 static void trace(const char *s, ...)
38 {
39 va_list elipsis;
40 va_start (elipsis, s);
41 vprintf(s, elipsis);
42 va_end(elipsis);
43 }
44 #endif
45
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46 rizwank 1.1 struct tvfs_file {
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47 rizwank 1.8 char fname[MAXFNAME];
48 int bytes_used;
49 char buf[MAXFLEN];
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50 rizwank 1.1 };
51 static struct tvfs_file *files[MAXFILES];
52
53 struct tvfs_fcb {
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54 rizwank 1.8 int pos;
55 int inode;
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56 rizwank 1.1 };
57 static struct tvfs_fcb *handles[MAXHANDLES];
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58 rizwank 1.8
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59 rizwank 1.1 int nhandles = 0;
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60 rizwank 1.8 int nfiles = 0;
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61 rizwank 1.1
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62 rizwank 1.2 /* tvfs_create does NOT correspond to _creat - it is an internal function
63 use to put a file directly into our virtual filesystem. */
64
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65 rizwank 1.1 int tvfs_create(const char *fname, const char *buf, int len)
66 {
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67 rizwank 1.8 int inode;
68 struct tvfs_file *f;
69
70 #ifdef TVFS_DEBUG
71 trace("tvfs_create called with %s, %d, %d\n", fname, buf, len);
72 #endif
73
74 if (nfiles >= MAXFILES)
75 return -1;
76 inode = nfiles++;
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77 rizwank 1.4
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78 rizwank 1.8 f = malloc(sizeof(struct tvfs_file));
79 strcpy(f->fname, fname);
80 f->bytes_used = len;
81
82 if (buf)
83 memcpy(f->buf, buf, len);
84
85 files[inode] = f;
86 return inode;
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87 rizwank 1.1 }
88
89 int tvfs_open(const char *fname, int flags, int mode)
90 {
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91 rizwank 1.4
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92 rizwank 1.8 /* mode and flags are not handled */
93 int h;
94 int inode;
95 struct tvfs_fcb *handler;
96
97 #ifdef TVFS_DEBUG
98 trace("tvfs_open called with %s, %d, %d\n", fname, flags, mode);
99 #endif
100
101 /* Existing file? */
102 for (inode=0; inode<nfiles; inode++) {
103 if (!files[inode])
104 continue;
105 if (!strcmp(files[inode]->fname, fname))
106 break;
107 }
108
109 if (inode == nfiles) {
110 /* File did not exist */
111 if ((flags & O_CREAT) == 0) {
112 /* ENOENT */
113 rizwank 1.8 #ifdef TVFS_DEBUG
114 trace("tvfs_open returning -1\n");
115 #endif
116 return -1;
117 }
118
119 inode = tvfs_create(fname, 0, 0);
120 }
121
122 handler = malloc(sizeof(struct tvfs_fcb));
123 handler->inode = inode;
124 handler->pos=0;
125 h = nfiles++;
126 handles[h] = handler;
127
128 #ifdef TVFS_DEBUG
129 trace("tvfs_open returning with %d\n", h);
130 #endif
131
132 return h;
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133 rizwank 1.1 }
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134 rizwank 1.2
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135 rizwank 1.1 unsigned int tvfs_read(int h, void *buf, unsigned int len)
136 {
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137 rizwank 1.8 int inode = handles[h]->inode;
138 int pos = handles[h]->pos;
139 int size = files[inode]->bytes_used;
140
141 #ifdef TVFS_DEBUG
142 trace("tvfs_read called with %d, %d, %d\n", h, buf, len);
143 #endif
144
145 /* Edge Case 1 : Request beyond boundary of file */
146 if (pos + len > size) {
147 len = size-pos;
148 }
149
150 memcpy(buf, files[inode]->buf+pos, len);
151 handles[h]->pos += len;
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152 rizwank 1.1
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153 rizwank 1.8 return len;
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154 rizwank 1.1 }
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155 rizwank 1.2
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156 rizwank 1.8 void tvfs_free()
157 {
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158 rizwank 1.4
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159 rizwank 1.8 int inode;
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160 rizwank 1.4
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161 rizwank 1.8 #ifdef TVFS_DEBUG
162 trace("tvfs_free\n");
163 #endif
164
165 nfiles=0;
166 nhandles=0;
167
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168 rizwank 1.4 for (inode=0; inode<nfiles; inode++) {
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169 rizwank 1.8 if (!files[inode])
170 continue;
171 free(files[inode]);
172 }
173 }
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174 rizwank 1.2
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175 rizwank 1.4 /* Compare given file with given contents, return 0 on equal, else nonzero */
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176 rizwank 1.8 int tvfs_compare(const char *fname, const char *buf, int len)
177 {
178
179 int inode;
180
181 #ifdef TVFS_DEBUG
182 trace("tvfs_compare called with %s, %d, %d\n", fname, buf, len);
183 #endif
184
185 for (inode=0; inode<nfiles; inode++) {
186 if (!files[inode])
187 continue;
188 if (!strcmp(files[inode]->fname, fname))
189 break;
190 }
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191 rizwank 1.7 if (inode == nfiles) {
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192 rizwank 1.8 /* File did not exist */
193 #ifdef TVFS_DEBUG
194 trace("tvfs_compare returning -1 (FAILURE)\n");
195 #endif
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196 rizwank 1.7 return -1;
197 }
198
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199 rizwank 1.8 return (memcmp(files[inode]->buf,buf,len));
200 /* doesnt check for out of bound */
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201 rizwank 1.4 }
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202 rizwank 1.2
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203 rizwank 1.8 long tvfs_lseek(int h, long whence, int whither )
204 {
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205 rizwank 1.2
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206 rizwank 1.8 int inode = handles[h]->inode;
207 int size = files[inode]->bytes_used;
208 #ifdef TVFS_DEBUG
209 trace("tvfs_lseek called with %d, %d, %d\n", h, whither, whence);
210 #endif
211
212 /* if (whence > size)
213 whence = size;*/
214 /* Legit lseek does NOT do boundry checking */
215
216 switch(whither) {
217 case SEEK_SET: {
218 handles[h]->pos = whence;
219 break;
220 }
221 case SEEK_CUR: {
222 handles[h]->pos += whence;
223 break;
224 }
225 case SEEK_END: {
226 handles[h]->pos = size+whence;
227 rizwank 1.8 break;
228 }
229 case 5: {
230 handles[h]->pos = size+whence;
231 break;
232 }
233 case 44: {
234 handles[h]->pos = size+whence;
235 break;
236 }
237 default:
238 {
239 trace("lseek was called with an invalid whither %d\n",whither);
240 return -1;
241 }
242 }
243 return handles[h]->pos;
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244 rizwank 1.4 }
245
246 int tvfs_close(int h){
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247 rizwank 1.8 int inode = handles[h]->inode;
248 #ifdef TVFS_DEBUG
249 trace("tvfs_close called with %d\n", h);
250 #endif
251 if (!files[inode]){
252 return -1;
253 }
254 free(handles[h]);
255 /* Currently does NOT enabled open to reuse this handle */
256 return 0;
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257 rizwank 1.4 }
258
259 unsigned int tvfs_write(int h, void *buf, unsigned int len)
260 {
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261 rizwank 1.8
262 int inode = handles[h]->inode;
263 int pos = handles[h]->pos;
264 #ifdef TVFS_DEBUG
265 trace("tvfs_write called with %d, %d, %d\n", h, buf, len);
266 #endif
267 memcpy(files[inode]->buf+pos, buf, len);
268 files[inode]->bytes_used += len;
269
270 return len;
271 /* return -1 to simulate diskfull or some other error */
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272 rizwank 1.4 }
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273 rizwank 1.8
274
275
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276 rizwank 1.4
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277 rizwank 1.2
278 #ifdef TVFS_MAIN
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279 rizwank 1.4
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280 rizwank 1.3 const static char name_test_txt[] = "test.txt";
281 const static char file_test_txt[] = "This is a test. Don't Panic!";
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282 rizwank 1.4 const static int size_test_txt = sizeof(file_test_txt);
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283 rizwank 1.2
284 main(){
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285 rizwank 1.8 int result;
286 int active_handler;
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287 rizwank 1.2
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288 rizwank 1.8 char *filebuf;
289
290 char dummy_filename[] = "dummy.txt";
291 char bad_filename[] = "chicken.txt";
292
293 filebuf = malloc(MAXFLEN);
294
295 printf("Testing TVFS implementation, creating %s\n",name_test_txt);
296 result = tvfs_create( dummy_filename, file_test_txt, size_test_txt);
297 result = tvfs_create( name_test_txt, file_test_txt,size_test_txt);
298 printf("Created virtual file with inode %d\n",result);
299
300 printf("Attempting to open non-existant file\n");
301 result = tvfs_open(bad_filename, _O_BINARY, 0 );
302 printf("Result code %d\n",result);
303 printf("Attempting to open existant file\n");
304 result = tvfs_open(name_test_txt, _O_BINARY, 0 );
305 printf("Result code %d\n",result);
306
307 active_handler = result;
308
309 rizwank 1.8 memset (filebuf,0,MAXFLEN);
310
311 printf("Testing reading from file %s\n",name_test_txt);
312 result = tvfs_read(active_handler, filebuf, 9);
313 printf("Read _%s_\n", filebuf);
314 if ( strcmp(filebuf,"This is a"))
315 printf("File read check failed!\n");
316
317 printf("Testing sequential reading from file %s\n",name_test_txt);
318 result = tvfs_read(active_handler, filebuf, 12);
319 printf("Read _%s_\n", filebuf);
320 if ( strcmp(filebuf," test. Don't"))
321 printf("File read check failed!\n");
322
323 printf("Testing edge reading from file %s\n",name_test_txt);
324 result = tvfs_read(active_handler, filebuf, 42);
325 printf("Read %d bytes - _%s_\n", result, filebuf);
326 if ( result != 8 )
327 printf("File read check failed!\n");
328
329 printf("Testing direct file compare and lseek of %s\n", name_test_txt);
330 rizwank 1.8 printf("Seeking to 0 (not needed) - ");
331 tvfs_lseek( active_handler, SEEK_SET, 0);
332 printf("Comparing file\n");
333 result = tvfs_compare( name_test_txt , file_test_txt, size_test_txt);
334 if (result)
335 printf ("File compare failed!\n");
336
337
338 printf("Closing %s\n",name_test_txt);
339 tvfs_close(active_handler);
340 if (result)
341 printf ("File close failed!\n");
342
343 tvfs_free();
344 free(filebuf);
345
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346 rizwank 1.2 }
347
348 #endif
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Return to
tvfs.c
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