attribute.c

   1 /*
   2  * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 #include "para.h"
   7 #include "error.h"
   8 #include "afh.h"
   9 #include "afs.h"
  10 #include "string.h"
  11 #include "net.h"
  12
  13 static void *attribute_table;
  14 static int greatest_att_bitnum;
  15
  16 /** The columns of the attribute table. */
  17 enum attribute_table_columns {
  18         /** The bit number (0-63). */
  19         ATTCOL_BITNUM,
  20         /** The name of the attribute. */
  21         ATTCOL_NAME,
  22         /** Number of columns in this table. */
  23         NUM_ATT_COLUMNS
  24 };
  25
  26 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  27 {
  28         const unsigned char *c1 = (const unsigned char*)obj1->data;
  29         const unsigned char *c2 = (const unsigned char*)obj2->data;
  30         if (*c1 > *c2)
  31                 return 1;
  32         if (*c1 < *c2)
  33                 return -1;
  34         return 0;
  35 }
  36
  37 static struct osl_column_description att_cols[] = {
  38         [ATTCOL_BITNUM] = {
  39                 .storage_type = OSL_MAPPED_STORAGE,
  40                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
  41                 .name = "bitnum",
  42                 .compare_function = char_compare,
  43                 .data_size = 1
  44         },
  45         [ATTCOL_NAME] = {
  46                 .storage_type = OSL_MAPPED_STORAGE,
  47                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  48                 .name = "name",
  49                 .compare_function = string_compare,
  50         }
  51 };
  52
  53 static struct osl_table_description attribute_table_desc = {
  54         .name = "attributes",
  55         .num_columns = NUM_ATT_COLUMNS,
  56         .flags = 0,
  57         .column_descriptions = att_cols
  58 };
  59
  60 static void find_greatest_att_bitnum(void)
  61 {
  62         unsigned char c = 63;
  63         do {
  64                 struct osl_row *row;
  65                 struct osl_object obj = {.data = &c, .size = 1};
  66                 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
  67                                 &row) >= 0) {
  68                         greatest_att_bitnum = c;
  69                         return;
  70                 }
  71         } while (c--);
  72         PARA_INFO_LOG("%s\n", "no attributes");
  73         greatest_att_bitnum = -E_NO_ATTRIBUTES;
  74 }
  75
  76 /**
  77  * Retrieve the identifier (number) of an attribute.
  78  *
  79  * \param att_name The name of the attribute.
  80  * \param bitnum Result pointer.
  81  *
  82  * \return Positive on success, negative on errors.
  83  */
  84 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
  85 {
  86         struct osl_object obj = {.data = (char *)att_name,
  87                 .size = strlen(att_name) + 1};
  88         struct osl_row *row;
  89         int ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
  90
  91         if (ret < 0)
  92                 return ret;
  93         ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj);
  94         if (ret < 0)
  95                 return ret;
  96         *bitnum = *(unsigned char *)obj.data;
  97         return 1;
  98 }
  99
 100 /** Whether "-a" was given for the lsatt command. */
 101 #define LSATT_FLAG_ALPHA 1
 102 /** Whether "-l" was given for the lsatt command. */
 103 #define LSATT_FLAG_LONG 2
 104
 105 /** Data passed via osl_rbtree_loop(). */
 106 struct private_lsatt_data {
 107         /** The given flags for the lsatt command. */
 108         unsigned flags;
 109         /** The result buffer. */
 110         struct para_buffer b;
 111 };
 112
 113 static int print_attribute(struct osl_row *row, void *private_data)
 114 {
 115         struct private_lsatt_data *pld = private_data;
 116         int ret;
 117         struct osl_object name_obj, bitnum_obj;
 118
 119         ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &name_obj);
 120         if (ret < 0)
 121                 return ret;
 122         if (!(pld->flags & LSATT_FLAG_LONG)) {
 123                 para_printf(&pld->b, "%s\n", (char *)name_obj.data);
 124                 return 1;
 125         }
 126         ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &bitnum_obj);
 127         if (ret < 0)
 128                 return ret;
 129         para_printf(&pld->b, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
 130                 (char *)name_obj.data);
 131         return 1;
 132 }
 133
 134 static int com_lsatt_callback(const struct osl_object *query,
 135                 struct osl_object *result)
 136 {
 137         struct private_lsatt_data pld = {.flags = *(uint32_t *) query->data};
 138         int ret;
 139
 140         if (pld.flags & LSATT_FLAG_ALPHA)
 141                 ret = osl_rbtree_loop(attribute_table, ATTCOL_NAME,
 142                         &pld, print_attribute);
 143         else
 144                 ret = osl_rbtree_loop(attribute_table, ATTCOL_BITNUM,
 145                         &pld, print_attribute);
 146         result->data = pld.b.buf;
 147         result->size = pld.b.size;
 148         return ret;
 149 }
 150
 151
 152 int com_lsatt(int fd, int argc, char * const * const argv)
 153 {
 154         int ret, i;
 155         uint32_t flags = 0;
 156         struct osl_object query, result;
 157
 158         for (i = 1; i < argc; i++) {
 159                 const char *arg = argv[i];
 160                 if (arg[0] != '-')
 161                         break;
 162                 if (!strcmp(arg, "--")) {
 163                         i++;
 164                         break;
 165                 }
 166                 if (!strcmp(arg, "-a")) {
 167                         flags |= LSATT_FLAG_ALPHA;
 168                         continue;
 169                 }
 170                 if (!strcmp(arg, "-l")) {
 171                         flags |= LSATT_FLAG_LONG;
 172                         continue;
 173                 }
 174         }
 175         if (argc > i)
 176                 return -E_ATTR_SYNTAX;
 177         query.data = &flags;
 178         query.size = sizeof(flags);
 179         ret = send_callback_request(com_lsatt_callback, &query, &result);
 180         if (ret > 0) {
 181                 ret = send_buffer(fd, (char *)result.data);
 182                 free(result.data);
 183         }
 184         return ret;
 185 }
 186
 187 static int com_setatt_callback(const struct osl_object *query,
 188                 __a_unused struct osl_object *result)
 189 {
 190         char *p;
 191         uint64_t add_mask = 0, del_mask = 0;
 192         int ret;
 193         size_t len;
 194         struct osl_object obj;
 195         struct osl_row *row;
 196
 197         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 198                 char c;
 199
 200                 len = strlen(p);
 201                 if (!*p)
 202                         return -E_ATTR_SYNTAX;
 203                 c = p[len - 1];
 204                 if (c != '+' && c != '-')
 205                         break;
 206                 p[len - 1] = '\0';
 207                 obj.data = p;
 208                 obj.size = len + 1;
 209                 ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 210                 if (ret < 0)
 211                         return ret;
 212                 ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 213                         &obj);
 214                 if (ret < 0)
 215                         return ret;
 216                 if (c == '+')
 217                         add_mask |= (1UL << *(unsigned char *)obj.data);
 218                 else
 219                         del_mask |= (1UL << *(unsigned char *)obj.data);
 220         }
 221         if (!add_mask && !del_mask)
 222                 return -E_ATTR_SYNTAX;
 223         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 224                 (long long unsigned)del_mask);
 225         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 226                 struct afs_info old_afsi, new_afsi;
 227                 struct osl_row *aft_row;
 228
 229                 len = strlen(p);
 230                 ret = aft_get_row_of_path(p, &aft_row);
 231                 if (ret < 0)
 232                         return ret;
 233                 ret = get_afsi_object_of_row(aft_row, &obj);
 234                 if (ret < 0)
 235                         return ret;
 236                 ret = load_afsi(&old_afsi, &obj);
 237                 if (ret < 0)
 238                         return ret;
 239                 new_afsi = old_afsi;
 240                 new_afsi.attributes |= add_mask;
 241                 new_afsi.attributes &= ~del_mask;
 242                 save_afsi(&new_afsi, &obj); /* in-place update */
 243 //              ret = mood_update_audio_file(aft_row, &old_afsi);
 244 //              if (ret < 0)
 245 //                      return ret;
 246         }
 247         return 1;
 248 }
 249
 250 int com_setatt(__a_unused int fd, int argc, char * const * const argv)
 251 {
 252         if (argc < 2)
 253                 return -E_ATTR_SYNTAX;
 254         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 255                 NULL);
 256 }
 257
 258 /* TODO: make it faster by only extracting the attribute member from afsi */
 259 static int logical_and_attribute(struct osl_row *aft_row, void *attribute_ptr)
 260 {
 261         struct afs_info afsi;
 262         uint64_t *att = attribute_ptr;
 263         struct osl_object obj;
 264         int ret = get_afsi_object_of_row(aft_row, &obj);
 265         if (ret < 0)
 266                 return ret;
 267         ret = load_afsi(&afsi, &obj);
 268         if (ret < 0)
 269                 return ret;
 270         afsi.attributes &= *att;
 271         save_afsi(&afsi, &obj);
 272         return 1;
 273 }
 274
 275 static int com_addatt_callback(const struct osl_object *query,
 276                 __a_unused struct osl_object *result)
 277 {
 278         char *p = query->data;
 279         uint64_t atts_added = 0;
 280         int ret;
 281
 282         while (p < (char *)query->data + query->size) {
 283                 struct osl_object objs[NUM_ATT_COLUMNS];
 284                 struct osl_row *row;
 285                 unsigned char bitnum;
 286
 287                 objs[ATTCOL_BITNUM].size = 1;
 288                 objs[ATTCOL_NAME].data = p;
 289                 objs[ATTCOL_NAME].size = strlen(p) + 1;
 290                 ret = osl_get_row(attribute_table, ATTCOL_NAME,
 291                         &objs[ATTCOL_NAME], &row); /* expected to fail */
 292                 if (ret >= 0)
 293                         return -E_ATTR_EXISTS;
 294                 if (ret != -E_RB_KEY_NOT_FOUND) /* error */
 295                         return ret;
 296                 /* find smallest non-used attribute */
 297                 for (bitnum = 0; bitnum < 64; bitnum++) {
 298                         objs[ATTCOL_BITNUM].data = &bitnum;
 299                         ret = osl_get_row(attribute_table, ATTCOL_BITNUM,
 300                                 &objs[ATTCOL_BITNUM], &row);
 301                         if (ret == -E_RB_KEY_NOT_FOUND)
 302                                 break; /* this bitnum is unused, use it */
 303                         if (ret < 0) /* error */
 304                                 return ret;
 305                         /* this bit is already in use, try next bit */
 306                 }
 307                 if (bitnum == 64)
 308                         return -E_ATTR_TABLE_FULL;
 309                 ret = osl_add_row(attribute_table, objs);
 310                 if (ret < 0)
 311                         return ret;
 312                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, bitnum);
 313                 atts_added |= 1 << bitnum;
 314                 p += strlen(p) + 1;
 315         }
 316         if (!atts_added)
 317                 return 1;
 318         atts_added = ~atts_added;
 319         ret = audio_file_loop(&atts_added, logical_and_attribute);
 320         if (ret < 0)
 321                 return ret;
 322         find_greatest_att_bitnum();
 323         return mood_reload(); /* FIXME: mood_reload() returns an error */
 324 }
 325
 326 int com_addatt(__a_unused int fd, int argc, char * const * const argv)
 327 {
 328         if (argc < 2)
 329                 return -E_ATTR_SYNTAX;
 330         return send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 331                 NULL);
 332 }
 333
 334 static int com_rmatt_callback(const struct osl_object *query,
 335                 __a_unused struct osl_object *result)
 336 {
 337         char *p = query->data;
 338         int ret, atts_removed = 0;
 339         while (p < (char *)query->data + query->size) {
 340                 struct osl_object obj = {
 341                         .data = p,
 342                         .size = strlen(p) + 1
 343                 };
 344                 struct osl_row *row;
 345                 ret = osl_get_row(attribute_table, ATTCOL_NAME,
 346                         &obj, &row);
 347                 if (ret < 0)
 348                         return ret;
 349                 ret = osl_del_row(attribute_table, row);
 350                 if (ret < 0)
 351                         return ret;
 352                 atts_removed++;
 353                 p += strlen(p) + 1;
 354         }
 355         find_greatest_att_bitnum();
 356         if (!atts_removed)
 357                 return 1;
 358         return mood_reload(); /* FIXME: Fix mood_reload() */
 359 }
 360
 361 int com_rmatt(__a_unused int fd, int argc, char * const * const argv)
 362 {
 363         if (argc < 2)
 364                 return -E_ATTR_SYNTAX;
 365         return send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 366                 NULL);
 367 }
 368
 369 /**
 370  * Return a binary representation of the geiven attribute value.
 371  *
 372  * \param atts Pointer to the attribute value.
 373  * \param buf Result.
 374  *
 375  * This function prints a string of at most 64 characters plus the terminating
 376  * \p NULL character into \a buf which must be provided by the caller and at
 377  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 378  * used for unset attributes.
 379  *
 380  * In practice, not all 64 attributes are defined. In this case, the function
 381  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 382  * attribute.
 383  */
 384 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 385 {
 386         int i;
 387         const uint64_t one = 1;
 388
 389         for (i = 0; i <= greatest_att_bitnum; i++)
 390                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 391         buf[i] = '\0';
 392 }
 393
 394 /**
 395  * Get a string containing the set attributes in text form.
 396  *
 397  * \param atts The attribute bitmap.
 398  * \param delim The delimiter to separate matching attribute names.
 399  * \param text Result pointer.
 400  *
 401  * \return Positive on success, negative on errors. If no attributes have
 402  * been defined, \a *text is NULL.
 403  */
 404 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 405 {
 406         int i, ret;
 407         const uint64_t one = 1;
 408
 409         *text = NULL;
 410         if (greatest_att_bitnum < 0) /* no attributes available */
 411                 return 1;
 412         for (i = 0; i <= greatest_att_bitnum; i++) {
 413                 unsigned char bn = i;
 414                 struct osl_object obj = {.data = &bn, .size = 1};
 415                 struct osl_row *row;
 416
 417                 if (!(*atts & (one << i)))
 418                         continue;
 419                 ret = osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row);
 420                 if (ret < 0)
 421                         goto err;
 422                 ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &obj);
 423                 if (ret < 0)
 424                         goto err;
 425                 if (*text) {
 426                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 427                         free(*text);
 428                         *text = tmp;
 429                 } else
 430                         *text = para_strdup(obj.data);
 431         }
 432         if (!*text) /* no attributes set */
 433                 *text = para_strdup("");
 434         return 1;
 435 err:
 436         free(*text);
 437         return ret;
 438 }
 439
 440 /**
 441  * Close the attribute table.
 442  *
 443  * \param flags Ususal flags that are passed to osl_close_table().
 444  *
 445  * \sa osl_close_table().
 446  */
 447 void attribute_shutdown(enum osl_close_flags flags)
 448 {
 449         osl_close_table(attribute_table, flags);
 450         attribute_table = NULL;
 451 }
 452
 453 /**
 454  * Open the attribute table.
 455  *
 456  * \param ti Gets initialized by this function.
 457  * \param db The database directory.
 458  *
 459  * \return Positive on success, negative on errors.
 460  *
 461  * \sa osl_open_table().
 462  */
 463 int attribute_init(struct table_info *ti, const char *db)
 464 {
 465         int ret;
 466
 467         attribute_table_desc.dir = db;
 468         ti->desc = &attribute_table_desc;
 469         ret = osl_open_table(ti->desc, &ti->table);
 470         greatest_att_bitnum = -1; /* no atts available */
 471         if (ret >= 0) {
 472                 attribute_table = ti->table;
 473                 find_greatest_att_bitnum();
 474                 return ret;
 475         }
 476         attribute_table = NULL;
 477         if (ret == -E_NOENT)
 478                 return 1;
 479         return ret;
 480 }