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>
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21 rizwank 1.7 #include <stdlib.h>
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22 rizwank 1.4 #include <stdio.h>
23 #include <malloc.h>
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24 rizwank 1.7 /*
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25 rizwank 1.4 #define DEBUG
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26 rizwank 1.7 */
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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 1.1 struct tvfs_file {
32 char fname[MAXFNAME];
33 int bytes_used;
34 char buf[MAXFLEN];
35 };
36 static struct tvfs_file *files[MAXFILES];
37 int nfiles = 0;
38
39 struct tvfs_fcb {
40 int pos;
41 int inode;
42 };
43 static struct tvfs_fcb *handles[MAXHANDLES];
44 int nhandles = 0;
45
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46 rizwank 1.2 /* tvfs_create does NOT correspond to _creat - it is an internal function
47 use to put a file directly into our virtual filesystem. */
48
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49 rizwank 1.1 int tvfs_create(const char *fname, const char *buf, int len)
50 {
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51 rizwank 1.2 int inode;
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52 rizwank 1.1 struct tvfs_file *f;
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53 rizwank 1.4
54 #ifdef DEBUG
55 printf("tvfs_create called with %s, %d, %d\n", fname, buf, len);
56 #endif
57
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58 rizwank 1.1 if (nfiles >= MAXFILES)
59 return -1;
60 inode = nfiles++;
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61 rizwank 1.2 /* calloc didn't work here, while malloc did */
62 f = malloc(sizeof(struct tvfs_file));
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63 rizwank 1.1 strcpy(f->fname, fname);
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64 rizwank 1.2 f->bytes_used = len;
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65 rizwank 1.1 if (buf)
66 memcpy(f->buf, buf, len);
67 files[inode] = f;
68 return inode;
69 }
70
71 int tvfs_open(const char *fname, int flags, int mode)
72 {
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73 rizwank 1.4
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74 rizwank 1.2 /* mode and flags are not handled */
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75 rizwank 1.1 int h;
76 int inode;
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77 rizwank 1.4 struct tvfs_fcb *handler;
78
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79 rizwank 1.6 #ifdef DEBUG
80 printf("tvfs_open called with %s, %d, %d\n", fname, flags, mode);
81 #endif
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82 rizwank 1.4
83 /* Existing file? */
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84 rizwank 1.1 for (inode=0; inode<nfiles; inode++) {
85 if (!files[inode])
86 continue;
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87 rizwank 1.2 if (!strcmp(files[inode]->fname, fname))
88 break; }
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89 rizwank 1.1 if (inode == nfiles) {
90 /* File did not exist */
91 if ((flags & O_CREAT) == 0) {
92 /* ENOENT */
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93 rizwank 1.6 #ifdef DEBUG
94 printf("tvfs_open returning -1\n");
95 #endif
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96 rizwank 1.1 return -1;
97 }
98 inode = tvfs_create(fname, 0, 0);
99 }
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100 rizwank 1.2 handler = malloc(sizeof(struct tvfs_fcb));
101 handler->inode = inode;
102 handler->pos=0;
103 h = nfiles++;
104 handles[h] = handler;
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105 rizwank 1.6 #ifdef DEBUG
106 printf("tvfs_open returning with %d\n", h);
107 #endif
108
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109 rizwank 1.2 return h;
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110 rizwank 1.1 }
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111 rizwank 1.2
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112 rizwank 1.1 unsigned int tvfs_read(int h, void *buf, unsigned int len)
113 {
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114 rizwank 1.2 int inode = handles[h]->inode;
115 int pos = handles[h]->pos;
116 int size = files[inode]->bytes_used;
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117 rizwank 1.1
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118 rizwank 1.4 #ifdef DEBUG
119 printf("tvfs_read called with %d, %d, %d\n", h, buf, len);
120 #endif
121
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122 rizwank 1.1 /* FIXME: handle edge cases */
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123 rizwank 1.2 /* Edge Case 1 : Request beyond boundary of file */
124 if (pos + len > size) {
125 len = size-pos;
126 }
127
128 memcpy(buf, files[inode]->buf+pos, len);
129 handles[h]->pos += len;
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130 rizwank 1.1
131 return len;
132 }
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133 rizwank 1.2
134 void tvfs_free(){
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135 rizwank 1.4
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136 rizwank 1.2 int inode;
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137 rizwank 1.4
138 #ifdef DEBUG
139 printf("tvfs_free\n");
140 #endif
141
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142 rizwank 1.7 nfiles=0;
143 nhandles=0;
144
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145 rizwank 1.4 for (inode=0; inode<nfiles; inode++) {
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146 rizwank 1.2 if (!files[inode])
147 continue;
148 free(files[inode]);
149 }
150 }
151
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152 rizwank 1.4 /* Compare given file with given contents, return 0 on equal, else nonzero */
153 int tvfs_compare(const char *fname, const char *buf, int len){
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154 rizwank 1.6
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155 rizwank 1.7 int inode;
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156 rizwank 1.6
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157 rizwank 1.4 #ifdef DEBUG
158 printf("tvfs_compare called with %s, %d, %d\n", fname, buf, len);
159 #endif
160
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161 rizwank 1.7 for (inode=0; inode<nfiles; inode++) {
162 if (!files[inode])
163 continue;
164 if (!strcmp(files[inode]->fname, fname))
165 break; }
166 if (inode == nfiles) {
167 /* File did not exist */
168 #ifdef DEBUG
169 printf("tvfs_compare returning -1 (FAILURE)\n");
170 #endif
171 return -1;
172 }
173
174 return (memcmp(files[inode]->buf,buf,len));
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175 rizwank 1.4 /* doesnt check for out of bound */
176 }
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177 rizwank 1.2
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178 rizwank 1.5 long tvfs_lseek(int h, long whence, int whither ){
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179 rizwank 1.2
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180 rizwank 1.4 int inode = handles[h]->inode;
181 int size = files[inode]->bytes_used;
182 #ifdef DEBUG
183 printf("tvfs_lseek called with %d, %d, %d\n", h, whither, whence);
184 #endif
185 /* if (whence > size)
186 whence = size;*/
187 /* Legit lseek does NOT do boundry checking */
188
189 switch(whither) {
190 case SEEK_SET: {
191 handles[h]->pos = whence;
192 break;
193 }
194 case SEEK_CUR: {
195 handles[h]->pos += whence;
196 break;
197 }
198 case SEEK_END: {
199 handles[h]->pos = size+whence;
200 break;
201 rizwank 1.4 }
202 case 5: {
203 handles[h]->pos = size+whence;
204 break;
205 }
206 case 44: {
207 handles[h]->pos = size+whence;
208 break;
209 }
210 default:
211 {
212 printf("lseek was called with an invalid whither %d\n",whither);
213 return -1;
214 }
215 }
216 return handles[h]->pos;
217 }
218
219 int tvfs_close(int h){
220 int inode = handles[h]->inode;
221 #ifdef DEBUG
222 rizwank 1.4 printf("tvfs_close called with %d\n", h);
223 #endif
224 if (!files[inode]){
225 return -1;
226 }
227 free(handles[h]);
228 /* Currently does NOT enabled open to reuse this handle */
229 return 0;
230 }
231
232 unsigned int tvfs_write(int h, void *buf, unsigned int len)
233 {
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234 rizwank 1.6
235 int inode = handles[h]->inode;
236 int pos = handles[h]->pos;
237
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238 rizwank 1.4 printf("tvfs_write called with %d, %d, %d\n", h, buf, len);
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239 rizwank 1.6
240 memcpy(files[inode]->buf+pos, buf, len);
241 files[inode]->bytes_used += len;
242
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243 rizwank 1.4 return len;
244 /* return -1 to simulate diskfull or some other error */
245 }
246
247
248
249
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250 rizwank 1.2
251 #ifdef TVFS_MAIN
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252 rizwank 1.4
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253 rizwank 1.3 const static char name_test_txt[] = "test.txt";
254 const static char file_test_txt[] = "This is a test. Don't Panic!";
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255 rizwank 1.4 const static int size_test_txt = sizeof(file_test_txt);
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256 rizwank 1.2
257 main(){
258 int result;
259 int active_handler;
260
261 char *filebuf;
262
263 char dummy_filename[] = "dummy.txt";
264 char bad_filename[] = "chicken.txt";
265
266 filebuf = malloc(MAXFLEN);
267
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268 rizwank 1.3 printf("Testing TVFS implementation, creating %s\n",name_test_txt);
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269 rizwank 1.4 result = tvfs_create( dummy_filename, file_test_txt, size_test_txt);
270 result = tvfs_create( name_test_txt, file_test_txt,size_test_txt);
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271 rizwank 1.2 printf("Created virtual file with inode %d\n",result);
272
273 /* This test failes because strcmp returns 0 incorrectly! */
274 printf("Attempting to open non-existant file\n");
275 result = tvfs_open(bad_filename, _O_BINARY, 0 );
276 printf("Result code %d\n",result);
277 printf("Attempting to open existant file\n");
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278 rizwank 1.3 result = tvfs_open(name_test_txt, _O_BINARY, 0 );
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279 rizwank 1.2 printf("Result code %d\n",result);
280
281 active_handler = result;
282
283 memset (filebuf,0,MAXFLEN);
284
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285 rizwank 1.3 printf("Testing reading from file %s\n",name_test_txt);
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286 rizwank 1.2 result = tvfs_read(active_handler, filebuf, 9);
287 printf("Read _%s_\n", filebuf);
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288 rizwank 1.4 if ( strcmp(filebuf,"This is a"))
289 printf("File read check failed!\n");
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290 rizwank 1.2
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291 rizwank 1.3 printf("Testing sequential reading from file %s\n",name_test_txt);
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292 rizwank 1.2 result = tvfs_read(active_handler, filebuf, 12);
293 printf("Read _%s_\n", filebuf);
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294 rizwank 1.4 if ( strcmp(filebuf," test. Don't"))
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295 rizwank 1.2 printf("File read check failed!\n");
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296 rizwank 1.4
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297 rizwank 1.3 printf("Testing edge reading from file %s\n",name_test_txt);
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298 rizwank 1.4 result = tvfs_read(active_handler, filebuf, 42);
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299 rizwank 1.2 printf("Read %d bytes - _%s_\n", result, filebuf);
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300 rizwank 1.4 if ( result != 8 )
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301 rizwank 1.2 printf("File read check failed!\n");
302
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303 rizwank 1.4 printf("Testing direct file compare and lseek of %s\n", name_test_txt);
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304 rizwank 1.7 printf("Seeking to 0 (not needed) - ");
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305 rizwank 1.4 tvfs_lseek( active_handler, SEEK_SET, 0);
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306 rizwank 1.7 printf("Comparing file\n");
307 result = tvfs_compare( name_test_txt , file_test_txt, size_test_txt);
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308 rizwank 1.4 if (result)
309 printf ("File compare failed!\n");
310
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311 rizwank 1.2
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312 rizwank 1.4 printf("Closing %s\n",name_test_txt);
313 tvfs_close(active_handler);
314 if (result)
315 printf ("File close failed!\n");
316
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317 rizwank 1.2 tvfs_free();
318 free(filebuf);
319
320 }
321
322 #endif
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Return to
tvfs.c
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