2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.10 1995-09-04 12:33:22 adam
8 * Various cleanup. YAZ util used instead.
10 * Revision 1.9 1994/11/04 14:26:39 quinn
13 * Revision 1.8 1994/10/05 16:56:42 quinn
16 * Revision 1.7 1994/09/19 14:12:37 quinn
19 * Revision 1.6 1994/09/14 13:10:15 quinn
20 * Corrected some bugs in the init-phase
22 * Revision 1.5 1994/09/12 08:01:51 quinn
25 * Revision 1.4 1994/09/01 14:51:07 quinn
26 * Allowed mf_write to write beyond eof+1.
28 * Revision 1.3 1994/08/24 09:37:17 quinn
29 * Changed reaction to read return values.
31 * Revision 1.2 1994/08/23 14:50:48 quinn
34 * Revision 1.1 1994/08/23 14:41:33 quinn
35 * First functional version.
41 * TODO: The size estimates in init may not be accurate due to
42 * only partially written final blocks.
45 #include <sys/types.h>
56 static MFile_area_struct *open_areas = 0;
57 static MFile_area_struct *default_area = 0;
59 static int scan_areadef(MFile_area ma, const char *name)
61 const char *ad = res_get(common_resource, name);
62 int offset = 0, rs, size, multi, rd;
63 char dirname[FILENAME_MAX+1], unit;
64 mf_dir **dp = &ma->dirs, *dir = *dp;
68 logf (LOG_FATAL, "Could not find resource '%s'", name);
73 rs = sscanf(ad + offset, "%[^:]:%d%c %n", dirname, &size, &unit, &rd);
78 logf (LOG_FATAL, "Illegal directory description: %s", ad + offset);
83 case 'B': case 'b': multi = 1; break;
84 case 'K': case 'k': multi = 1024; break;
85 case 'M': case 'm': multi = 1048576; break;
87 logf (LOG_FATAL, "Illegal unit: %c in %s", unit, ad + offset);
90 *dp = dir = xmalloc(sizeof(mf_dir));
92 strcpy(dir->name, dirname);
93 dir->max_bytes = dir->avail_bytes = size * multi;
100 static int file_position(MFile mf, int pos, int offset)
102 int off = 0, c = mf->cur_file, ps;
104 if ((c > 0 && pos <= mf->files[c-1].top) ||
105 (c < mf->no_files -1 && pos > mf->files[c].top))
108 while (mf->files[c].top >= 0 && mf->files[c].top < pos)
110 off += mf->files[c].blocks;
113 assert(c < mf->no_files);
116 off = c ? (mf->files[c-1].top + 1) : 0;
117 if (mf->files[c].fd < 0 && (mf->files[c].fd = open(mf->files[c].path,
118 mf->wr ? O_RDWR|O_CREAT : O_RDONLY, 0666)) < 0)
120 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", mf->files[c].path);
123 if (lseek(mf->files[c].fd, (ps = pos - off) * mf->blocksize + offset,
126 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s", mf->files[c].path);
133 static int cmp_part_file(const void *p1, const void *p2)
135 return ((part_file *)p1)->number - ((part_file *)p2)->number;
139 * Create a new area, cotaining metafiles in directories.
140 * Find the part-files in each directory, and inventory the existing metafiles.
142 MFile_area mf_init(const char *name)
144 MFile_area ma = xmalloc(sizeof(MFile_area_struct)), mp;
147 part_file *part_f = 0;
151 char metaname[FILENAME_MAX+1], tmpnam[FILENAME_MAX+1];
153 logf (LOG_DEBUG, "mf_init(%s)", name);
154 for (mp = open_areas; mp; mp = mp->next)
155 if (!strcmp(name, mp->name))
157 strcpy(ma->name, name);
158 ma->next = open_areas;
162 if (scan_areadef(ma, name) < 0)
164 logf (LOG_FATAL, "Failed to access description of '%s'", name);
167 /* look at each directory */
168 for (dirp = ma->dirs; dirp; dirp = dirp->next)
170 if (!(dd = opendir(dirp->name)))
172 logf (LOG_FATAL|LOG_ERRNO, "Failed to open %s", dirp->name);
175 /* look at each file */
176 while ((dent = readdir(dd)))
178 if (*dent->d_name == '.')
180 if (sscanf(dent->d_name, "%[^.].%d", metaname, &number) != 2)
182 logf (LOG_FATAL, "Failed to resolve part-name %s",
186 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
189 if (!strcmp(meta_f->name, metaname))
191 part_f = &meta_f->files[meta_f->no_files++];
198 meta_f = xmalloc(sizeof(*meta_f));
200 meta_f->next = ma->mfiles;
202 meta_f->cur_file = -1;
204 strcpy(meta_f->name, metaname);
205 part_f = &meta_f->files[0];
206 meta_f->no_files = 1;
208 part_f->number = number;
211 sprintf(tmpnam, "%s/%s", dirp->name, dent->d_name);
212 part_f->path = xstrdup(tmpnam);
214 if ((fd = open(part_f->path, O_RDONLY)) < 0)
216 logf (LOG_FATAL|LOG_ERRNO, "Failed to access %s",
220 if ((part_f->bytes = lseek(fd, 0, SEEK_END)) < 0)
222 logf (LOG_FATAL|LOG_ERRNO, "Failed to seek in %s",
227 dirp->avail_bytes -= part_f->bytes;
231 for (meta_f = ma->mfiles; meta_f; meta_f = meta_f->next)
233 logf (LOG_DEBUG, "mf_init: %s consists of %d part(s)", meta_f->name,
235 qsort(meta_f->files, meta_f->no_files, sizeof(part_file),
243 * If !ma, Use MF_DEFAULT_AREA.
245 MFile mf_open(MFile_area ma, const char *name, int block_size, int wflag)
247 struct meta_file *new;
249 char tmp[FILENAME_MAX+1];
252 logf(LOG_LOG, "mf_open(%s bs=%d, %s)", name, block_size,
253 wflag ? "RW" : "RDONLY");
256 if (!default_area && !(default_area = mf_init(MF_DEFAULT_AREA)))
258 logf (LOG_FATAL, "Failed to open default area.");
263 for (new = ma->mfiles; new; new = new->next)
264 if (!strcmp(name, new->name))
271 new = xmalloc(sizeof(*new));
272 strcpy(new->name, name);
273 /* allocate one, empty file */
275 new->files[0].bytes = new->files[0].blocks = 0;
276 new->files[0].top = -1;
277 new->files[0].number = 0;
278 new->files[0].fd = -1;
279 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
280 for (dp = ma->dirs; dp && dp->avail_bytes < new->min_bytes_creat;
284 logf (LOG_FATAL, "Insufficient space for new mfile.");
287 new->files[0].dir = dp;
288 sprintf(tmp, "%s/%s.%d", dp->name, new->name, 0);
289 new->files[0].path = xstrdup(tmp);
294 for (i = 0; i < new->no_files; i++)
296 if (new->files[i].bytes % block_size)
297 new->files[i].bytes += block_size - new->files[i].bytes %
299 new->files[i].blocks = new->files[i].bytes / block_size;
303 new->blocksize = block_size;
304 new->min_bytes_creat = MF_MIN_BLOCKS_CREAT * block_size;
309 for (i = 0; i < new->no_files; i++)
311 new->files[i].blocks = new->files[i].bytes / new->blocksize;
312 if (i == new->no_files)
313 new->files[i].top = -1;
315 new->files[i].top = i ? (new->files[i-1].top + new->files[i].blocks)
316 : (new->files[i].blocks - 1);
324 int mf_close(MFile mf)
328 logf (LOG_DEBUG, "mf_close(%s)", mf->name);
330 for (i = 0; i < mf->no_files; i++)
331 if (mf->files[i].fd >= 0)
333 close(mf->files[i].fd);
334 mf->files[i].fd = -1;
341 * Read one block from a metafile. Interface mirrors bfile.
343 int mf_read(MFile mf, int no, int offset, int num, void *buf)
347 if (file_position(mf, no, offset) < 0)
349 toread = num ? num : mf->blocksize;
350 if ((rd = read(mf->files[mf->cur_file].fd, buf, toread)) < 0)
352 logf (LOG_FATAL|LOG_ERRNO, "mf_read: Read failed (%s)",
353 mf->files[mf->cur_file].path);
356 else if (rd < toread)
365 int mf_write(MFile mf, int no, int offset, int num, const void *buf)
367 int ps, nblocks, towrite;
369 char tmp[FILENAME_MAX+1];
370 unsigned char dummych = '\xff';
372 if ((ps = file_position(mf, no, offset)) < 0)
374 /* file needs to grow */
375 while (ps >= mf->files[mf->cur_file].blocks)
377 logf (LOG_DEBUG, "File grows");
378 /* file overflow - allocate new file */
379 if ((ps - mf->files[mf->cur_file].blocks + 1) * mf->blocksize >
380 mf->files[mf->cur_file].dir->avail_bytes)
383 if ((nblocks = mf->files[mf->cur_file].dir->avail_bytes /
386 logf (LOG_DEBUG, "Capping off file %s at pos %d",
387 mf->files[mf->cur_file].path, nblocks);
388 if ((ps = file_position(mf,
389 (mf->cur_file ? mf->files[mf->cur_file-1].top : 0) +
390 mf->files[mf->cur_file].blocks + nblocks, 0)) < 0)
392 if (write(mf->files[mf->cur_file].fd, &dummych, 1) < 1)
394 logf (LOG_ERRNO|LOG_FATAL, "write dummy");
397 mf->files[mf->cur_file].blocks += nblocks;
398 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
399 mf->files[mf->cur_file].dir->avail_bytes -= nblocks *
403 logf (LOG_DEBUG, "Creating new file.");
404 for (dp = mf->ma->dirs; dp && dp->avail_bytes < mf->min_bytes_creat;
408 logf (LOG_FATAL, "Cannot allocate more space for %s",
412 mf->files[mf->cur_file].top = (mf->cur_file ?
413 mf->files[mf->cur_file-1].top : -1) +
414 mf->files[mf->cur_file].blocks;
415 mf->files[++(mf->cur_file)].top = -1;
416 mf->files[mf->cur_file].dir = dp;
417 mf->files[mf->cur_file].number =
418 mf->files[mf->cur_file-1].number + 1;
419 mf->files[mf->cur_file].blocks =
420 mf->files[mf->cur_file].bytes = 0;
421 mf->files[mf->cur_file].fd = -1;
422 sprintf(tmp, "%s/%s.%d", dp->name, mf->name,
423 mf->files[mf->cur_file].number);
424 mf->files[mf->cur_file].path = xstrdup(tmp);
426 /* open new file and position at beginning */
427 if ((ps = file_position(mf, no, offset)) < 0)
432 nblocks = ps - mf->files[mf->cur_file].blocks + 1;
433 mf->files[mf->cur_file].blocks += nblocks;
434 mf->files[mf->cur_file].bytes += nblocks * mf->blocksize;
435 mf->files[mf->cur_file].dir->avail_bytes -= nblocks * mf->blocksize;
438 towrite = num ? num : mf->blocksize;
439 if (write(mf->files[mf->cur_file].fd, buf, towrite) < towrite)
441 logf (LOG_FATAL|LOG_ERRNO, "Write failed");
448 * Destroy a metafile, unlinking component files. File must be open.
450 int mf_unlink(MFile mf)
457 * Unlink the file by name, rather than MFile-handle. File should be closed.
459 int mf_unlink_name(MFile_area ma, const char *name)