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 /* This is extremely cheezy. Everything is preallocated per file. */
11
12 #define MAXFILES 10
13 #define MAXHANDLES 10
14 #define MAXFNAME 255
15 #define MAXFLEN 65536
16
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17 rizwank 1.4 /*
18 #define TVFS_MAIN
19 */
20 #include <fcntl.h>
21 #include <stdlib.h> /* For _MAX_PATH definition */
22 #include <stdio.h>
23 #include <malloc.h>
24
25 #define DEBUG
26
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27 rizwank 1.2
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28 rizwank 1.4 #define SEEK_SET 0
29 #define SEEK_CUR 1
30 #define SEEK_END 2
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31 rizwank 1.2
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32 rizwank 1.1 struct tvfs_file {
33 char fname[MAXFNAME];
34 int bytes_used;
35 char buf[MAXFLEN];
36 };
37 static struct tvfs_file *files[MAXFILES];
38 int nfiles = 0;
39
40 struct tvfs_fcb {
41 int pos;
42 int inode;
43 };
44 static struct tvfs_fcb *handles[MAXHANDLES];
45 int nhandles = 0;
46
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47 rizwank 1.2 /* tvfs_create does NOT correspond to _creat - it is an internal function
48 use to put a file directly into our virtual filesystem. */
49
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50 rizwank 1.1 int tvfs_create(const char *fname, const char *buf, int len)
51 {
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52 rizwank 1.2 int inode;
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53 rizwank 1.1 struct tvfs_file *f;
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54 rizwank 1.4
55 #ifdef DEBUG
56 printf("tvfs_create called with %s, %d, %d\n", fname, buf, len);
57 #endif
58
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59 rizwank 1.1 if (nfiles >= MAXFILES)
60 return -1;
61 inode = nfiles++;
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62 rizwank 1.2 /* calloc didn't work here, while malloc did */
63 f = malloc(sizeof(struct tvfs_file));
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64 rizwank 1.1 strcpy(f->fname, fname);
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65 rizwank 1.2 f->bytes_used = len;
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66 rizwank 1.1 if (buf)
67 memcpy(f->buf, buf, len);
68 files[inode] = f;
69 return inode;
70 }
71
72 int tvfs_open(const char *fname, int flags, int mode)
73 {
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74 rizwank 1.4
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75 rizwank 1.2 /* mode and flags are not handled */
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76 rizwank 1.1 int h;
77 int inode;
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78 rizwank 1.4 struct tvfs_fcb *handler;
79
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80 rizwank 1.6 #ifdef DEBUG
81 printf("tvfs_open called with %s, %d, %d\n", fname, flags, mode);
82 #endif
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83 rizwank 1.4
84 /* Existing file? */
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85 rizwank 1.1 for (inode=0; inode<nfiles; inode++) {
86 if (!files[inode])
87 continue;
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88 rizwank 1.2 if (!strcmp(files[inode]->fname, fname))
89 break; }
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90 rizwank 1.1 if (inode == nfiles) {
91 /* File did not exist */
92 if ((flags & O_CREAT) == 0) {
93 /* ENOENT */
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94 rizwank 1.6 #ifdef DEBUG
95 printf("tvfs_open returning -1\n");
96 #endif
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97 rizwank 1.1 return -1;
98 }
99 inode = tvfs_create(fname, 0, 0);
100 }
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101 rizwank 1.2 handler = malloc(sizeof(struct tvfs_fcb));
102 handler->inode = inode;
103 handler->pos=0;
104 h = nfiles++;
105 handles[h] = handler;
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106 rizwank 1.6 #ifdef DEBUG
107 printf("tvfs_open returning with %d\n", h);
108 #endif
109
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110 rizwank 1.2 return h;
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111 rizwank 1.1 }
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112 rizwank 1.2
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113 rizwank 1.1 unsigned int tvfs_read(int h, void *buf, unsigned int len)
114 {
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115 rizwank 1.2 int inode = handles[h]->inode;
116 int pos = handles[h]->pos;
117 int size = files[inode]->bytes_used;
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118 rizwank 1.1
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119 rizwank 1.4 #ifdef DEBUG
120 printf("tvfs_read called with %d, %d, %d\n", h, buf, len);
121 #endif
122
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123 rizwank 1.1 /* FIXME: handle edge cases */
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124 rizwank 1.2 /* Edge Case 1 : Request beyond boundary of file */
125 if (pos + len > size) {
126 len = size-pos;
127 }
128
129 memcpy(buf, files[inode]->buf+pos, len);
130 handles[h]->pos += len;
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131 rizwank 1.1
132 return len;
133 }
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134 rizwank 1.2
135 void tvfs_free(){
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136 rizwank 1.4
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137 rizwank 1.2 int inode;
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138 rizwank 1.4
139 #ifdef DEBUG
140 printf("tvfs_free\n");
141 #endif
142
143 for (inode=0; inode<nfiles; inode++) {
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144 rizwank 1.2 if (!files[inode])
145 continue;
146 free(files[inode]);
147 }
148 }
149
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150 rizwank 1.4 /* Compare given file with given contents, return 0 on equal, else nonzero */
151 int tvfs_compare(const char *fname, const char *buf, int len){
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152 rizwank 1.6
153 char filebuf[MAXFLEN];
154
155 for (inode=0; inode<nfiles; inode++) {
156 if (!files[inode])
157 continue;
158 if (!strcmp(files[inode]->fname, fname))
159 break; }
160
161
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162 rizwank 1.4 #ifdef DEBUG
163 printf("tvfs_compare called with %s, %d, %d\n", fname, buf, len);
164 #endif
165
166 return (memcmp(fname,buf,len));
167 /* doesnt check for out of bound */
168 }
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169 rizwank 1.2
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170 rizwank 1.5 long tvfs_lseek(int h, long whence, int whither ){
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171 rizwank 1.2
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172 rizwank 1.4 int inode = handles[h]->inode;
173 int size = files[inode]->bytes_used;
174 #ifdef DEBUG
175 printf("tvfs_lseek called with %d, %d, %d\n", h, whither, whence);
176 #endif
177 /* if (whence > size)
178 whence = size;*/
179 /* Legit lseek does NOT do boundry checking */
180
181 switch(whither) {
182 case SEEK_SET: {
183 handles[h]->pos = whence;
184 break;
185 }
186 case SEEK_CUR: {
187 handles[h]->pos += whence;
188 break;
189 }
190 case SEEK_END: {
191 handles[h]->pos = size+whence;
192 break;
193 rizwank 1.4 }
194 case 5: {
195 handles[h]->pos = size+whence;
196 break;
197 }
198 case 44: {
199 handles[h]->pos = size+whence;
200 break;
201 }
202 default:
203 {
204 printf("lseek was called with an invalid whither %d\n",whither);
205 return -1;
206 }
207 }
208 return handles[h]->pos;
209 }
210
211 int tvfs_close(int h){
212 int inode = handles[h]->inode;
213 #ifdef DEBUG
214 rizwank 1.4 printf("tvfs_close called with %d\n", h);
215 #endif
216 if (!files[inode]){
217 return -1;
218 }
219 free(handles[h]);
220 /* Currently does NOT enabled open to reuse this handle */
221 return 0;
222 }
223
224 unsigned int tvfs_write(int h, void *buf, unsigned int len)
225 {
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226 rizwank 1.6
227 int inode = handles[h]->inode;
228 int pos = handles[h]->pos;
229
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230 rizwank 1.4 printf("tvfs_write called with %d, %d, %d\n", h, buf, len);
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231 rizwank 1.6
232 memcpy(files[inode]->buf+pos, buf, len);
233 files[inode]->bytes_used += len;
234
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235 rizwank 1.4 return len;
236 /* return -1 to simulate diskfull or some other error */
237 }
238
239
240
241
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242 rizwank 1.2
243 #ifdef TVFS_MAIN
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244 rizwank 1.4
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245 rizwank 1.3 const static char name_test_txt[] = "test.txt";
246 const static char file_test_txt[] = "This is a test. Don't Panic!";
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247 rizwank 1.4 const static int size_test_txt = sizeof(file_test_txt);
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248 rizwank 1.2
249 main(){
250 int result;
251 int active_handler;
252
253 char *filebuf;
254
255 char dummy_filename[] = "dummy.txt";
256 char bad_filename[] = "chicken.txt";
257
258 filebuf = malloc(MAXFLEN);
259
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260 rizwank 1.3 printf("Testing TVFS implementation, creating %s\n",name_test_txt);
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261 rizwank 1.4 result = tvfs_create( dummy_filename, file_test_txt, size_test_txt);
262 result = tvfs_create( name_test_txt, file_test_txt,size_test_txt);
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263 rizwank 1.2 printf("Created virtual file with inode %d\n",result);
264
265 /* This test failes because strcmp returns 0 incorrectly! */
266 printf("Attempting to open non-existant file\n");
267 result = tvfs_open(bad_filename, _O_BINARY, 0 );
268 printf("Result code %d\n",result);
269 printf("Attempting to open existant file\n");
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270 rizwank 1.3 result = tvfs_open(name_test_txt, _O_BINARY, 0 );
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271 rizwank 1.2 printf("Result code %d\n",result);
272
273 active_handler = result;
274
275 memset (filebuf,0,MAXFLEN);
276
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277 rizwank 1.3 printf("Testing reading from file %s\n",name_test_txt);
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278 rizwank 1.2 result = tvfs_read(active_handler, filebuf, 9);
279 printf("Read _%s_\n", filebuf);
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280 rizwank 1.4 if ( strcmp(filebuf,"This is a"))
281 printf("File read check failed!\n");
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282 rizwank 1.2
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283 rizwank 1.3 printf("Testing sequential reading from file %s\n",name_test_txt);
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284 rizwank 1.2 result = tvfs_read(active_handler, filebuf, 12);
285 printf("Read _%s_\n", filebuf);
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286 rizwank 1.4 if ( strcmp(filebuf," test. Don't"))
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287 rizwank 1.2 printf("File read check failed!\n");
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288 rizwank 1.4
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289 rizwank 1.3 printf("Testing edge reading from file %s\n",name_test_txt);
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290 rizwank 1.4 result = tvfs_read(active_handler, filebuf, 42);
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291 rizwank 1.2 printf("Read %d bytes - _%s_\n", result, filebuf);
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292 rizwank 1.4 if ( result != 8 )
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293 rizwank 1.2 printf("File read check failed!\n");
294
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295 rizwank 1.4 printf("Testing direct file compare and lseek of %s\n", name_test_txt);
296 printf("Seeking to 0 - ");
297 tvfs_lseek( active_handler, SEEK_SET, 0);
298 printf("Reading and comparing file\n");
299 result = tvfs_read(active_handler, filebuf, size_test_txt);
300 result = tvfs_compare( filebuf , file_test_txt, size_test_txt);
301 if (result)
302 printf ("File compare failed!\n");
303
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304 rizwank 1.2
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305 rizwank 1.4 printf("Closing %s\n",name_test_txt);
306 tvfs_close(active_handler);
307 if (result)
308 printf ("File close failed!\n");
309
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310 rizwank 1.2 tvfs_free();
311 free(filebuf);
312
313 }
314
315 #endif
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Return to
tvfs.c
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