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
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10 rizwank 1.9 #define MAXFILES 20
11 #define MAXHANDLES 20
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12 rizwank 1.1 #define MAXFNAME 255
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13 rizwank 1.9 #define MAXFLEN 65536*2
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14 rizwank 1.1
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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 {
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39 rizwank 1.10 va_list ellipsis;
40 va_start (ellipsis, s);
41 vprintf(s, ellipsis);
42 va_end(ellipsis);
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43 rizwank 1.8 }
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
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63 rizwank 1.10 use to put a file directly into our virtual file system. */
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64 rizwank 1.2
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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
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70 rizwank 1.10 #ifdef TVFS_DEBUG
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71 rizwank 1.8 trace("tvfs_create called with %s, %d, %d\n", fname, buf, len);
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72 rizwank 1.10 #endif
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73 rizwank 1.8
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
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97 rizwank 1.10 #ifdef TVFS_DEBUG
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98 rizwank 1.8 trace("tvfs_open called with %s, %d, %d\n", fname, flags, mode);
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99 rizwank 1.10 #endif
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100 rizwank 1.8
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 */
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113 rizwank 1.10 #ifdef TVFS_DEBUG
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114 rizwank 1.8 trace("tvfs_open returning -1\n");
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115 rizwank 1.10 #endif
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116 rizwank 1.8 return -1;
117 }
118
119 inode = tvfs_create(fname, 0, 0);
120 }
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121 rizwank 1.9
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122 rizwank 1.8 handler = malloc(sizeof(struct tvfs_fcb));
123 handler->inode = inode;
124 handler->pos=0;
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125 rizwank 1.9 h = nhandles++;
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126 rizwank 1.8 handles[h] = handler;
127
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128 rizwank 1.10 #ifdef TVFS_DEBUG
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129 rizwank 1.8 trace("tvfs_open returning with %d\n", h);
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130 rizwank 1.10 #endif
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131 rizwank 1.8
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
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141 rizwank 1.10 #ifdef TVFS_DEBUG
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142 rizwank 1.8 trace("tvfs_read called with %d, %d, %d\n", h, buf, len);
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143 rizwank 1.10 #endif
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144 rizwank 1.8
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 {
158 int inode;
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159 rizwank 1.9 int handle;
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160 rizwank 1.4
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161 rizwank 1.10 #ifdef TVFS_DEBUG
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162 rizwank 1.8 trace("tvfs_free\n");
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163 rizwank 1.10 #endif
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164 rizwank 1.8
165 nfiles=0;
166 nhandles=0;
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167 rizwank 1.9
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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 }
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173 rizwank 1.9
174 for (handle=0; handle<nhandles; handle++) {
175 if (!handles[handle])
176 continue;
177 free(handles[handle]);
178 }
179
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180 rizwank 1.8 }
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181 rizwank 1.2
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182 rizwank 1.4 /* Compare given file with given contents, return 0 on equal, else nonzero */
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183 rizwank 1.8 int tvfs_compare(const char *fname, const char *buf, int len)
184 {
185
186 int inode;
187
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188 rizwank 1.10 #ifdef TVFS_DEBUG
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189 rizwank 1.8 trace("tvfs_compare called with %s, %d, %d\n", fname, buf, len);
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190 rizwank 1.10 #endif
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191 rizwank 1.8
192 for (inode=0; inode<nfiles; inode++) {
193 if (!files[inode])
194 continue;
195 if (!strcmp(files[inode]->fname, fname))
196 break;
197 }
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198 rizwank 1.9
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199 rizwank 1.7 if (inode == nfiles) {
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200 rizwank 1.8 /* File did not exist */
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201 rizwank 1.10 #ifdef TVFS_DEBUG
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202 rizwank 1.8 trace("tvfs_compare returning -1 (FAILURE)\n");
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203 rizwank 1.10 #endif
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204 rizwank 1.7 return -1;
205 }
206
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207 rizwank 1.8 return (memcmp(files[inode]->buf,buf,len));
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208 rizwank 1.10 /* does not check for out of bound */
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209 rizwank 1.4 }
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210 rizwank 1.2
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211 rizwank 1.8 long tvfs_lseek(int h, long whence, int whither )
212 {
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213 rizwank 1.2
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214 rizwank 1.8 int inode = handles[h]->inode;
215 int size = files[inode]->bytes_used;
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216 rizwank 1.10 #ifdef TVFS_DEBUG
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217 rizwank 1.8 trace("tvfs_lseek called with %d, %d, %d\n", h, whither, whence);
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218 rizwank 1.10 #endif
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219 rizwank 1.8
220 /* if (whence > size)
221 whence = size;*/
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222 rizwank 1.10 /* Legit lseek does NOT do boundary checking */
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223 rizwank 1.8
224 switch(whither) {
225 case SEEK_SET: {
226 handles[h]->pos = whence;
227 break;
228 }
229 case SEEK_CUR: {
230 handles[h]->pos += whence;
231 break;
232 }
233 case SEEK_END: {
234 handles[h]->pos = size+whence;
235 break;
236 }
237 case 5: {
238 handles[h]->pos = size+whence;
239 break;
240 }
241 case 44: {
242 handles[h]->pos = size+whence;
243 break;
244 rizwank 1.8 }
245 default:
246 {
247 trace("lseek was called with an invalid whither %d\n",whither);
248 return -1;
249 }
250 }
251 return handles[h]->pos;
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252 rizwank 1.4 }
253
254 int tvfs_close(int h){
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255 rizwank 1.8 int inode = handles[h]->inode;
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256 rizwank 1.10 #ifdef TVFS_DEBUG
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257 rizwank 1.8 trace("tvfs_close called with %d\n", h);
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258 rizwank 1.10 #endif
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259 rizwank 1.8 if (!files[inode]){
260 return -1;
261 }
262 free(handles[h]);
263 /* Currently does NOT enabled open to reuse this handle */
264 return 0;
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265 rizwank 1.4 }
266
267 unsigned int tvfs_write(int h, void *buf, unsigned int len)
268 {
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269 rizwank 1.8
270 int inode = handles[h]->inode;
271 int pos = handles[h]->pos;
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272 rizwank 1.10 #ifdef TVFS_DEBUG
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273 rizwank 1.8 trace("tvfs_write called with %d, %d, %d\n", h, buf, len);
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274 rizwank 1.10 #endif
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275 rizwank 1.8 memcpy(files[inode]->buf+pos, buf, len);
276 files[inode]->bytes_used += len;
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277 rizwank 1.9 handles[h]->pos += len;
278
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279 rizwank 1.8 return len;
280 /* return -1 to simulate diskfull or some other error */
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281 rizwank 1.4 }
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282 rizwank 1.8
283
284
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285 rizwank 1.4
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286 rizwank 1.2
287 #ifdef TVFS_MAIN
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288 rizwank 1.4
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289 rizwank 1.3 const static char name_test_txt[] = "test.txt";
290 const static char file_test_txt[] = "This is a test. Don't Panic!";
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291 rizwank 1.4 const static int size_test_txt = sizeof(file_test_txt);
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292 rizwank 1.2
293 main(){
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294 rizwank 1.8 int result;
295 int active_handler;
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296 rizwank 1.2
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297 rizwank 1.8 char *filebuf;
298
299 char dummy_filename[] = "dummy.txt";
300 char bad_filename[] = "chicken.txt";
301
302 filebuf = malloc(MAXFLEN);
303
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304 rizwank 1.10 trace("Testing TVFS implementation, creating %s\n",name_test_txt);
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305 rizwank 1.8 result = tvfs_create( dummy_filename, file_test_txt, size_test_txt);
306 result = tvfs_create( name_test_txt, file_test_txt,size_test_txt);
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307 rizwank 1.10 trace("Created virtual file with inode %d\n",result);
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308 rizwank 1.8
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309 rizwank 1.10 trace("Attempting to open non-existent file\n");
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310 rizwank 1.8 result = tvfs_open(bad_filename, _O_BINARY, 0 );
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311 rizwank 1.10 trace("Result code %d\n",result);
312 trace("Attempting to open existent file\n");
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313 rizwank 1.8 result = tvfs_open(name_test_txt, _O_BINARY, 0 );
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314 rizwank 1.10 trace("Result code %d\n",result);
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315 rizwank 1.8
316 active_handler = result;
317
318 memset (filebuf,0,MAXFLEN);
319
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320 rizwank 1.10 trace("Testing reading from file %s\n",name_test_txt);
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321 rizwank 1.8 result = tvfs_read(active_handler, filebuf, 9);
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322 rizwank 1.10 trace("Read _%s_\n", filebuf);
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323 rizwank 1.8 if ( strcmp(filebuf,"This is a"))
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324 rizwank 1.10 trace("File read check failed!\n");
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325 rizwank 1.8
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326 rizwank 1.10 trace("Testing sequential reading from file %s\n",name_test_txt);
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327 rizwank 1.8 result = tvfs_read(active_handler, filebuf, 12);
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328 rizwank 1.10 trace("Read _%s_\n", filebuf);
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329 rizwank 1.8 if ( strcmp(filebuf," test. Don't"))
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330 rizwank 1.10 trace("File read check failed!\n");
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331 rizwank 1.8
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332 rizwank 1.10 trace("Testing edge reading from file %s\n",name_test_txt);
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333 rizwank 1.8 result = tvfs_read(active_handler, filebuf, 42);
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334 rizwank 1.10 trace("Read %d bytes - _%s_\n", result, filebuf);
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335 rizwank 1.8 if ( result != 8 )
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336 rizwank 1.10 trace("File read check failed!\n");
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337 rizwank 1.8
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338 rizwank 1.10 trace("Testing direct file compare and lseek of %s\n", name_test_txt);
339 trace("Seeking to 0 (not needed) - ");
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340 rizwank 1.8 tvfs_lseek( active_handler, SEEK_SET, 0);
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341 rizwank 1.10 trace("Comparing file\n");
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342 rizwank 1.8 result = tvfs_compare( name_test_txt , file_test_txt, size_test_txt);
343 if (result)
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344 rizwank 1.10 trace ("File compare failed!\n");
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345 rizwank 1.8
346
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347 rizwank 1.10 trace("Closing %s\n",name_test_txt);
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348 rizwank 1.8 tvfs_close(active_handler);
349 if (result)
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350 rizwank 1.10 trace ("File close failed!\n");
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351 rizwank 1.8
352 tvfs_free();
353 free(filebuf);
354
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355 rizwank 1.2 }
356
357 #endif
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Return to
tvfs.c
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