blob.c

   1 /*
   2  * Copyright (C) 2007-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file blob.c Macros and functions for blob handling. */
   8
   9 #include <regex.h>
  10 #include <fnmatch.h>
  11 #include <osl.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "crypt.h"
  16 #include "string.h"
  17 #include "afh.h"
  18 #include "afs.h"
  19 #include "net.h"
  20 #include "ipc.h"
  21 #include "portable_io.h"
  22
  23 /**
  24  * Compare two osl objects pointing to unsigned integers of 32 bit size.
  25  *
  26  * \param obj1 Pointer to the first integer.
  27  * \param obj2 Pointer to the second integer.
  28  *
  29  * \return The values required for an osl compare function.
  30  *
  31  * \sa osl_compare_func, osl_hash_compare().
  32  */
  33 static int uint32_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  34 {
  35         uint32_t d1 = read_u32((const char *)obj1->data);
  36         uint32_t d2 = read_u32((const char *)obj2->data);
  37
  38         if (d1 < d2)
  39                 return 1;
  40         if (d1 > d2)
  41                 return -1;
  42         return 0;
  43 }
  44
  45 static struct osl_column_description blob_cols[] = {
  46         [BLOBCOL_ID] = {
  47                 .storage_type = OSL_MAPPED_STORAGE,
  48                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  49                 .name = "id",
  50                 .data_size = 4,
  51                 .compare_function = uint32_compare
  52         },
  53         [BLOBCOL_NAME] = {
  54                 .storage_type = OSL_MAPPED_STORAGE,
  55                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  56                 .name = "name",
  57                 .compare_function = string_compare
  58         },
  59         [BLOBCOL_DEF] = {
  60                 .storage_type = OSL_DISK_STORAGE,
  61                 .storage_flags = 0,
  62                 .name = "definition"
  63         }
  64 };
  65
  66 /** Define an osl table description for a blob table. */
  67 #define DEFINE_BLOB_TABLE_DESC(table_name) \
  68         struct osl_table_description table_name ## _table_desc = { \
  69                 .name = #table_name, \
  70                 .num_columns = NUM_BLOB_COLUMNS, \
  71                 .flags = OSL_LARGE_TABLE, \
  72                 .column_descriptions = blob_cols \
  73         };
  74
  75 /** Define a pointer to an osl blob table with a canonical name. */
  76 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
  77
  78
  79 /** Define a blob table. */
  80 #define INIT_BLOB_TABLE(table_name) \
  81         DEFINE_BLOB_TABLE_DESC(table_name); \
  82         DEFINE_BLOB_TABLE_PTR(table_name);
  83
  84 /** \cond doxygen isn't smart enough to recognize these */
  85 INIT_BLOB_TABLE(lyrics);
  86 INIT_BLOB_TABLE(images);
  87 INIT_BLOB_TABLE(moods);
  88 INIT_BLOB_TABLE(playlists);
  89 /** \endcond */
  90
  91 /** Flags that may be passed to the \p ls functions of each blob  type. */
  92 enum blob_ls_flags {
  93         /** List both id and name. */
  94         BLOB_LS_FLAG_LONG = 1,
  95         /** Reverse sort order. */
  96         BLOB_LS_FLAG_REVERSE = 2,
  97         /** Sort by id instead of name. */
  98         BLOB_LS_FLAG_SORT_BY_ID = 4,
  99 };
 100
 101 /** Structure passed to the \p print_blob function. */
 102 struct lsblob_action_data {
 103         /** The flags given at the command line. */
 104         uint32_t flags;
 105         /** Message buffer. */
 106         struct para_buffer pb;
 107 };
 108
 109 static int print_blob(struct osl_table *table, struct osl_row *row,
 110                 const char *name, void *data)
 111 {
 112         struct lsblob_action_data *lbad = data;
 113         struct osl_object obj;
 114         uint32_t id;
 115         int ret;
 116
 117         if (!(lbad->flags & BLOB_LS_FLAG_LONG))
 118                 return para_printf(&lbad->pb, "%s\n", name);
 119         ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 120         if (ret < 0) {
 121                 para_printf(&lbad->pb, "%s: %s\n", name, para_strerror(-ret));
 122                 return ret;
 123         }
 124         id = *(uint32_t *)obj.data;
 125         return para_printf(&lbad->pb, "%u\t%s\n", id, name);
 126 }
 127
 128 static void com_lsblob_callback(struct osl_table *table,
 129                 int fd, const struct osl_object *query)
 130 {
 131         struct lsblob_action_data lbad = {
 132                 .flags = *(uint32_t *)query->data,
 133                 .pb = {
 134                         .max_size = SHMMAX,
 135                         .private_data = &fd,
 136                         .max_size_handler = pass_buffer_as_shm
 137                 }
 138         };
 139         struct pattern_match_data pmd = {
 140                 .table = table,
 141                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
 142                         .size = query->size - sizeof(uint32_t)},
 143                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
 144                 .match_col_num = BLOBCOL_NAME,
 145                 .data = &lbad,
 146                 .action = print_blob,
 147         };
 148         int ret;
 149
 150         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
 151                 pmd.pm_flags |= PM_REVERSE_LOOP;
 152         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 153                 pmd.loop_col_num = BLOBCOL_NAME;
 154         else
 155                 pmd.loop_col_num = BLOBCOL_ID;
 156         ret = for_each_matching_row(&pmd);
 157         if (ret < 0)
 158                 para_printf(&lbad.pb, "%s\n", para_strerror(-ret));
 159         if (lbad.pb.offset)
 160                 pass_buffer_as_shm(lbad.pb.buf, lbad.pb.offset, &fd);
 161         free(lbad.pb.buf);
 162 }
 163
 164 static int com_lsblob(callback_function *f, struct stream_cipher_context *scc, int argc, char * const * const argv)
 165 {
 166         uint32_t flags = 0;
 167         struct osl_object options = {.data = &flags, .size = sizeof(flags)};
 168         int i;
 169
 170         for (i = 1; i < argc; i++) {
 171                 const char *arg = argv[i];
 172                 if (arg[0] != '-')
 173                         break;
 174                 if (!strcmp(arg, "--")) {
 175                         i++;
 176                         break;
 177                 }
 178                 if (!strcmp(arg, "-l")) {
 179                         flags |= BLOB_LS_FLAG_LONG;
 180                         continue;
 181                 }
 182                 if (!strcmp(arg, "-i")) {
 183                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 184                         continue;
 185                 }
 186                 if (!strcmp(arg, "-r")) {
 187                         flags |= BLOB_LS_FLAG_REVERSE;
 188                         continue;
 189                 }
 190                 break;
 191         }
 192 //      if (argc > i)
 193 //              return -E_BLOB_SYNTAX;
 194         return send_option_arg_callback_request(&options, argc - i,
 195                 argv + i, f, sc_send_result, scc);
 196 }
 197
 198 static int cat_blob(struct osl_table *table, struct osl_row *row,
 199                 __a_unused const char *name, void *data)
 200 {
 201         int ret = 0, ret2;
 202         struct osl_object obj;
 203
 204         ret = osl(osl_open_disk_object(table, row, BLOBCOL_DEF, &obj));
 205         if (ret < 0)
 206                 return ret;
 207         if (obj.size)
 208                 ret = pass_buffer_as_shm(obj.data, obj.size, data);
 209         ret2 = osl(osl_close_disk_object(&obj));
 210         return (ret < 0)? ret : ret2;
 211 }
 212
 213 static void com_catblob_callback(struct osl_table *table, int fd,
 214                 const struct osl_object *query)
 215 {
 216         struct pattern_match_data pmd = {
 217                 .table = table,
 218                 .patterns = *query,
 219                 .loop_col_num = BLOBCOL_NAME,
 220                 .match_col_num = BLOBCOL_NAME,
 221                 .pm_flags = PM_SKIP_EMPTY_NAME,
 222                 .data = &fd,
 223                 .action = cat_blob
 224         };
 225         for_each_matching_row(&pmd);
 226 }
 227
 228 static int com_catblob(callback_function *f, struct stream_cipher_context *scc, int argc,
 229                 char * const * const argv)
 230 {
 231         if (argc < 2)
 232                 return -E_BLOB_SYNTAX;
 233         return send_standard_callback_request(argc - 1, argv + 1, f,
 234                 sc_send_result, scc);
 235 }
 236
 237 /** Used for removing rows from a blob table. */
 238 struct rmblob_data {
 239         /** Message buffer. */
 240         struct para_buffer pb;
 241         /** Number of removed blobs. */
 242         unsigned num_removed;
 243 };
 244
 245 static int remove_blob(struct osl_table *table, struct osl_row *row,
 246                 const char *name, void *data)
 247 {
 248         struct rmblob_data *rmbd = data;
 249         int ret = osl(osl_del_row(table, row));
 250         if (ret < 0) {
 251                 para_printf(&rmbd->pb, "%s: %s\n", name, para_strerror(-ret));
 252                 return ret;
 253         }
 254         rmbd->num_removed++;
 255         return 1;
 256 }
 257
 258 static void com_rmblob_callback(struct osl_table *table, int fd,
 259                 const struct osl_object *query)
 260 {
 261         int ret, ret2 = 0;
 262         struct rmblob_data rmbd = {
 263                 .num_removed = 0,
 264                 .pb = {
 265                         .max_size = SHMMAX,
 266                         .private_data = &fd,
 267                         .max_size_handler = pass_buffer_as_shm
 268                 }
 269         };
 270         struct pattern_match_data pmd = {
 271                 .table = table,
 272                 .patterns = *query,
 273                 .loop_col_num = BLOBCOL_NAME,
 274                 .match_col_num = BLOBCOL_NAME,
 275                 .pm_flags = PM_SKIP_EMPTY_NAME,
 276                 .data = &rmbd,
 277                 .action = remove_blob
 278         };
 279         ret = for_each_matching_row(&pmd);
 280         if (ret < 0) {
 281                 ret2 = para_printf(&rmbd.pb, "%s\n", para_strerror(-ret));
 282                 if (ret2 < 0)
 283                         goto out;
 284         }
 285         if (!rmbd.num_removed)
 286                 ret2 = para_printf(&rmbd.pb, "no matches, nothing removed\n");
 287         else {
 288                 ret2 = para_printf(&rmbd.pb, "removed %d blobs\n", rmbd.num_removed);
 289                 afs_event(BLOB_RENAME, NULL, table);
 290         }
 291 out:
 292         if (ret2 >= 0 && rmbd.pb.offset)
 293                 pass_buffer_as_shm(rmbd.pb.buf, rmbd.pb.offset, &fd);
 294         free(rmbd.pb.buf);
 295 }
 296
 297 static int com_rmblob(callback_function *f, struct stream_cipher_context *scc, int argc,
 298                 char * const * const argv)
 299 {
 300         if (argc < 2)
 301                 return -E_MOOD_SYNTAX;
 302         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 303                 sc_send_result, scc);
 304 }
 305
 306 static void com_addblob_callback(struct osl_table *table, __a_unused int fd,
 307                 const struct osl_object *query)
 308 {
 309         struct osl_object objs[NUM_BLOB_COLUMNS];
 310         char *name = query->data;
 311         size_t name_len = strlen(name) + 1;
 312         uint32_t id;
 313         unsigned num_rows;
 314         int ret;
 315
 316         ret = osl(osl_get_num_rows(table, &num_rows));
 317         if (ret < 0)
 318                 goto out;
 319         if (!num_rows) { /* this is the first entry ever added */
 320                 /* insert dummy row containing the id */
 321                 id = 2; /* this entry will be entry #1, so 2 is the next */
 322                 objs[BLOBCOL_ID].data = &id;
 323                 objs[BLOBCOL_ID].size = sizeof(id);
 324                 objs[BLOBCOL_NAME].data = "";
 325                 objs[BLOBCOL_NAME].size = 1;
 326                 objs[BLOBCOL_DEF].data = "";
 327                 objs[BLOBCOL_DEF].size = 1;
 328                 ret = osl(osl_add_row(table, objs));
 329                 if (ret < 0)
 330                         goto out;
 331         } else {
 332                 /* check if name already exists */
 333                 struct osl_row *row;
 334                 struct osl_object obj = {.data = name, .size = name_len};
 335                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 336                 if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
 337                         goto out;
 338                 if (ret >= 0) { /* we already have a blob with this name */
 339                         obj.data = name + name_len;
 340                         obj.size = query->size - name_len;
 341                         ret = osl(osl_update_object(table, row, BLOBCOL_DEF, &obj));
 342                         goto out;
 343                 }
 344                 /* new blob, get id of the dummy row and increment it */
 345                 obj.data = "";
 346                 obj.size = 1;
 347                 ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 348                 if (ret < 0)
 349                         goto out;
 350                 ret = osl(osl_get_object(table, row, BLOBCOL_ID, &obj));
 351                 if (ret < 0)
 352                         goto out;
 353                 id = *(uint32_t *)obj.data + 1;
 354                 obj.data = &id;
 355                 ret = osl(osl_update_object(table, row, BLOBCOL_ID, &obj));
 356                 if (ret < 0)
 357                         goto out;
 358         }
 359         id--;
 360         objs[BLOBCOL_ID].data = &id;
 361         objs[BLOBCOL_ID].size = sizeof(id);
 362         objs[BLOBCOL_NAME].data = name;
 363         objs[BLOBCOL_NAME].size = name_len;
 364         objs[BLOBCOL_DEF].data = name + name_len;
 365         objs[BLOBCOL_DEF].size = query->size - name_len;
 366         ret = osl(osl_add_row(table, objs));
 367         if (ret < 0)
 368                 goto out;
 369         afs_event(BLOB_ADD, NULL, table);
 370 out:
 371         if (ret < 0)
 372                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 373 }
 374
 375 /*
 376  * write input from fd to dynamically allocated buffer,
 377  * but maximal max_size byte.
 378  */
 379 static int fd2buf(struct stream_cipher_context *scc, unsigned max_size, struct osl_object *obj)
 380 {
 381         const size_t chunk_size = 1024;
 382         size_t size = 2048, received = 0;
 383         int ret;
 384         char *buf = para_malloc(size);
 385
 386         for (;;) {
 387                 ret = sc_recv_bin_buffer(scc, buf + received, chunk_size);
 388                 if (ret <= 0)
 389                         break;
 390                 received += ret;
 391                 if (received + chunk_size >= size) {
 392                         size *= 2;
 393                         ret = -E_INPUT_TOO_LARGE;
 394                         if (size > max_size)
 395                                 break;
 396                         buf = para_realloc(buf, size);
 397                 }
 398         }
 399         obj->data = buf;
 400         obj->size = received;
 401         if (ret < 0)
 402                 free(buf);
 403         return ret;
 404 }
 405
 406 /*
 407  * Read data from a file descriptor, and send it to the afs process.
 408  *
 409  * \param scc crypt context containing the file descriptor to read data from.
 410  * \param arg_obj Pointer to the arguments to \a f.
 411  * \param f The callback function.
 412  * \param max_len Don't read more than that many bytes from stdin.
 413  * \param result_handler See \ref send_callback_request.
 414  * \param private_result_data See \ref send_callback_request.
 415  *
 416  * This function is used by commands that wish to let para_server store
 417  * arbitrary data specified by the user (for instance the add_blob family of
 418  * commands). First, at most \a max_len bytes are read and decrypted from the
 419  * file descriptor given by \a scc. The result is concatenated with the buffer
 420  * given by \a arg_obj, and the combined buffer is made available to the afs
 421  * process via the callback method. See \ref send_callback_request for details.
 422  *
 423  * \return Negative on errors, the return value of the underlying call to
 424  * send_callback_request() otherwise.
 425  */
 426 static int stdin_command(struct stream_cipher_context *scc, struct osl_object *arg_obj,
 427                 callback_function *f, unsigned max_len,
 428                 callback_result_handler *result_handler,
 429                 void *private_result_data)
 430 {
 431         struct osl_object query, stdin_obj;
 432         int ret;
 433
 434         ret = sc_send_buffer(scc, AWAITING_DATA_MSG);
 435         if (ret < 0)
 436                 return ret;
 437         ret = fd2buf(scc, max_len, &stdin_obj);
 438         if (ret < 0)
 439                 return ret;
 440         query.size = arg_obj->size + stdin_obj.size;
 441         query.data = para_malloc(query.size);
 442         memcpy(query.data, arg_obj->data, arg_obj->size);
 443         memcpy((char *)query.data + arg_obj->size, stdin_obj.data, stdin_obj.size);
 444         free(stdin_obj.data);
 445         ret = send_callback_request(f, &query, result_handler, private_result_data);
 446         free(query.data);
 447         return ret;
 448 }
 449
 450 static int com_addblob(callback_function *f, struct stream_cipher_context *scc, int argc,
 451                 char * const * const argv)
 452 {
 453         struct osl_object arg_obj;
 454
 455         if (argc != 2)
 456                 return -E_BLOB_SYNTAX;
 457         if (!*argv[1]) /* empty name is reserved for the dummy row */
 458                 return -E_BLOB_SYNTAX;
 459         arg_obj.size = strlen(argv[1]) + 1;
 460         arg_obj.data = (char *)argv[1];
 461         return stdin_command(scc, &arg_obj, f, 10 * 1024 * 1024, NULL, NULL);
 462 }
 463
 464 /* FIXME: Print output to client, not to log file */
 465 static void com_mvblob_callback(struct osl_table *table, __a_unused int fd,
 466                 const struct osl_object *query)
 467 {
 468         char *src = (char *) query->data;
 469         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 470         char *dest = src + obj.size;
 471         struct osl_row *row;
 472         int ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 473
 474         if (ret < 0)
 475                 goto out;
 476         obj.data = dest;
 477         obj.size = strlen(dest) + 1;
 478         ret = osl(osl_update_object(table, row, BLOBCOL_NAME, &obj));
 479         if (ret < 0)
 480                 goto out;
 481         afs_event(BLOB_RENAME, NULL, table);
 482 out:
 483         if (ret < 0)
 484                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 485 }
 486
 487 static int com_mvblob(callback_function *f, __a_unused struct stream_cipher_context *scc,
 488                 int argc, char * const * const argv)
 489 {
 490         if (argc != 3)
 491                 return -E_MOOD_SYNTAX;
 492         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 493                 NULL, NULL);
 494 }
 495
 496 #define DEFINE_BLOB_COMMAND(cmd_name, table_name, cmd_prefix) \
 497         static void com_ ## cmd_name ## cmd_prefix ## _callback(int fd, const struct osl_object *query) \
 498         { \
 499                 return com_ ## cmd_name ## blob_callback(table_name ## _table, fd, query); \
 500         } \
 501         int com_ ## cmd_name ## cmd_prefix(struct stream_cipher_context *scc, int argc, char * const * const argv) \
 502         { \
 503                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, scc, argc, argv); \
 504         }
 505
 506 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 507                 char **name)
 508 {
 509         struct osl_row *row;
 510         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 511         int ret;
 512
 513         *name = NULL;
 514         if (!id)
 515                 return 1;
 516         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 517         if (ret < 0)
 518                 return ret;
 519         ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 520         if (ret < 0)
 521                 return ret;
 522         *name = (char *)obj.data;
 523         return 1;
 524 }
 525
 526 /** Define the \p get_name_by_id function for this blob type. */
 527 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 528         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 529         { \
 530                 return blob_get_name_by_id(table_name ## _table, id, name); \
 531         }
 532
 533
 534 static int blob_get_def_by_name(struct osl_table *table, char *name,
 535                 struct osl_object *def)
 536 {
 537         struct osl_row *row;
 538         struct osl_object obj = {.data = name, .size = strlen(name) + 1};
 539         int ret;
 540
 541         def->data = NULL;
 542         if (!*name)
 543                 return 1;
 544         ret = osl(osl_get_row(table, BLOBCOL_NAME, &obj, &row));
 545         if (ret < 0)
 546                 return ret;
 547         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 548 }
 549
 550 /** Define the \p get_def_by_id function for this blob type. */
 551 #define DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix) \
 552         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def) \
 553         { \
 554                 return blob_get_def_by_name(table_name ## _table, name, def); \
 555         }
 556
 557 static int blob_get_def_by_id(struct osl_table *table, uint32_t id,
 558                 struct osl_object *def)
 559 {
 560         struct osl_row *row;
 561         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 562         int ret;
 563
 564         def->data = NULL;
 565         if (!id)
 566                 return 1;
 567         ret = osl(osl_get_row(table, BLOBCOL_ID, &obj, &row));
 568         if (ret < 0)
 569                 return ret;
 570         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 571 }
 572
 573 /** Define the \p get_def_by_id function for this blob type. */
 574 #define DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix) \
 575         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def) \
 576         { \
 577                 return blob_get_def_by_id(table_name ## _table, id, def); \
 578         }
 579
 580 static int blob_get_name_and_def_by_row(struct osl_table *table,
 581                 const struct osl_row *row, char **name, struct osl_object *def)
 582 {
 583         struct osl_object obj;
 584         int ret = osl(osl_get_object(table, row, BLOBCOL_NAME, &obj));
 585         if (ret < 0)
 586                 return ret;
 587         *name = obj.data;
 588         return osl(osl_open_disk_object(table, row, BLOBCOL_DEF, def));
 589 }
 590 /** Define the \p get_name_and_def_by_row function for this blob type. */
 591 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 592         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 593                 char **name, struct osl_object *def) \
 594         { \
 595                 return blob_get_name_and_def_by_row(table_name ## _table, \
 596                         row, name, def); \
 597         }
 598
 599 /** Define the \p close function for this blob type. */
 600 #define DEFINE_BLOB_CLOSE(table_name) \
 601         static void table_name ## _close(void) \
 602         { \
 603                 osl_close_table(table_name ## _table, OSL_MARK_CLEAN); \
 604                 table_name ## _table = NULL; \
 605         }
 606
 607 /** Define the \p create function for this blob type. */
 608 #define DEFINE_BLOB_CREATE(table_name) \
 609         static int table_name ## _create(const char *dir) \
 610         { \
 611                 table_name ## _table_desc.dir = dir; \
 612                 return osl_create_table(&table_name ## _table_desc); \
 613         }
 614
 615 static int blob_open(struct osl_table **table,
 616                 struct osl_table_description *desc,
 617                 const char *dir)
 618 {
 619         int ret;
 620         desc->dir = dir;
 621         ret = osl(osl_open_table(desc, table));
 622         if (ret >= 0)
 623                 return ret;
 624         *table = NULL;
 625         if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
 626                 return 1;
 627         return ret;
 628 }
 629
 630 #define DEFINE_BLOB_OPEN(table_name) \
 631         static int table_name ## _open(const char *dir) \
 632         { \
 633                 return blob_open(&table_name ## _table, \
 634                         &table_name ## _table_desc, dir); \
 635         }
 636
 637
 638 /** Define the \p init function for this blob type. */
 639 #define DEFINE_BLOB_INIT(table_name) \
 640         void table_name ## _init(struct afs_table *t) \
 641         { \
 642                 t->open = table_name ## _open; \
 643                 t->close = table_name ## _close; \
 644                 t->create = table_name ## _create;\
 645                 t->event_handler = table_name ##_event_handler; \
 646                 table_name ## _table = NULL; \
 647         }
 648
 649
 650 /** Define all functions for this blob type. */
 651 #define DEFINE_BLOB_FUNCTIONS(table_name, cmd_prefix) \
 652         DEFINE_BLOB_OPEN(table_name) \
 653         DEFINE_BLOB_CLOSE(table_name) \
 654         DEFINE_BLOB_CREATE(table_name) \
 655         DEFINE_BLOB_INIT(table_name) \
 656         DEFINE_BLOB_COMMAND(ls, table_name, cmd_prefix) \
 657         DEFINE_BLOB_COMMAND(cat, table_name, cmd_prefix) \
 658         DEFINE_BLOB_COMMAND(add, table_name, cmd_prefix) \
 659         DEFINE_BLOB_COMMAND(rm, table_name, cmd_prefix) \
 660         DEFINE_BLOB_COMMAND(mv, table_name, cmd_prefix) \
 661         DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix); \
 662         DEFINE_GET_DEF_BY_ID(table_name, cmd_prefix); \
 663         DEFINE_GET_DEF_BY_NAME(table_name, cmd_prefix); \
 664         DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix); \
 665
 666 /** \cond doxygen isn't smart enough to recognize these */
 667 DEFINE_BLOB_FUNCTIONS(lyrics, lyr);
 668 DEFINE_BLOB_FUNCTIONS(images, img);
 669 DEFINE_BLOB_FUNCTIONS(moods, mood);
 670 DEFINE_BLOB_FUNCTIONS(playlists, pl);
 671 /** \endcond */