Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 457 lines (395 sloc) 10.722 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456
/*
* QDict Module
*
* Copyright (C) 2009 Red Hat Inc.
*
* Authors:
* Luiz Capitulino <lcapitulino@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*/

#include "qint.h"
#include "qfloat.h"
#include "qdict.h"
#include "qbool.h"
#include "qstring.h"
#include "qobject.h"
#include "qemu-queue.h"
#include "qemu-common.h"

static void qdict_destroy_obj(QObject *obj);

static const QType qdict_type = {
    .code = QTYPE_QDICT,
    .destroy = qdict_destroy_obj,
};

/**
* qdict_new(): Create a new QDict
*
* Return strong reference.
*/
QDict *qdict_new(void)
{
    QDict *qdict;

    qdict = qemu_mallocz(sizeof(*qdict));
    QOBJECT_INIT(qdict, &qdict_type);

    return qdict;
}

/**
* qobject_to_qdict(): Convert a QObject into a QDict
*/
QDict *qobject_to_qdict(const QObject *obj)
{
    if (qobject_type(obj) != QTYPE_QDICT)
        return NULL;

    return container_of(obj, QDict, base);
}

/**
* tdb_hash(): based on the hash agorithm from gdbm, via tdb
* (from module-init-tools)
*/
static unsigned int tdb_hash(const char *name)
{
    unsigned value; /* Used to compute the hash value. */
    unsigned i; /* Used to cycle through random values. */

    /* Set the initial value from the key size. */
    for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++)
        value = (value + (((const unsigned char *)name)[i] << (i*5 % 24)));

    return (1103515243 * value + 12345);
}

/**
* alloc_entry(): allocate a new QDictEntry
*/
static QDictEntry *alloc_entry(const char *key, QObject *value)
{
    QDictEntry *entry;

    entry = qemu_mallocz(sizeof(*entry));
    entry->key = qemu_strdup(key);
    entry->value = value;

    return entry;
}

/**
* qdict_entry_value(): Return qdict entry value
*
* Return weak reference.
*/
QObject *qdict_entry_value(const QDictEntry *entry)
{
    return entry->value;
}

/**
* qdict_entry_key(): Return qdict entry key
*
* Return a *pointer* to the string, it has to be duplicated before being
* stored.
*/
const char *qdict_entry_key(const QDictEntry *entry)
{
    return entry->key;
}

/**
* qdict_find(): List lookup function
*/
static QDictEntry *qdict_find(const QDict *qdict,
                              const char *key, unsigned int bucket)
{
    QDictEntry *entry;

    QLIST_FOREACH(entry, &qdict->table[bucket], next)
        if (!strcmp(entry->key, key))
            return entry;

    return NULL;
}

/**
* qdict_put_obj(): Put a new QObject into the dictionary
*
* Insert the pair 'key:value' into 'qdict', if 'key' already exists
* its 'value' will be replaced.
*
* This is done by freeing the reference to the stored QObject and
* storing the new one in the same entry.
*
* NOTE: ownership of 'value' is transferred to the QDict
*/
void qdict_put_obj(QDict *qdict, const char *key, QObject *value)
{
    unsigned int bucket;
    QDictEntry *entry;

    bucket = tdb_hash(key) % QDICT_BUCKET_MAX;
    entry = qdict_find(qdict, key, bucket);
    if (entry) {
        /* replace key's value */
        qobject_decref(entry->value);
        entry->value = value;
    } else {
        /* allocate a new entry */
        entry = alloc_entry(key, value);
        QLIST_INSERT_HEAD(&qdict->table[bucket], entry, next);
        qdict->size++;
    }
}

/**
* qdict_get(): Lookup for a given 'key'
*
* Return a weak reference to the QObject associated with 'key' if
* 'key' is present in the dictionary, NULL otherwise.
*/
QObject *qdict_get(const QDict *qdict, const char *key)
{
    QDictEntry *entry;

    entry = qdict_find(qdict, key, tdb_hash(key) % QDICT_BUCKET_MAX);
    return (entry == NULL ? NULL : entry->value);
}

/**
* qdict_haskey(): Check if 'key' exists
*
* Return 1 if 'key' exists in the dict, 0 otherwise
*/
int qdict_haskey(const QDict *qdict, const char *key)
{
    unsigned int bucket = tdb_hash(key) % QDICT_BUCKET_MAX;
    return (qdict_find(qdict, key, bucket) == NULL ? 0 : 1);
}

/**
* qdict_size(): Return the size of the dictionary
*/
size_t qdict_size(const QDict *qdict)
{
    return qdict->size;
}

/**
* qdict_get_obj(): Get a QObject of a specific type
*/
static QObject *qdict_get_obj(const QDict *qdict, const char *key,
                              qtype_code type)
{
    QObject *obj;

    obj = qdict_get(qdict, key);
    assert(obj != NULL);
    assert(qobject_type(obj) == type);

    return obj;
}

/**
* qdict_get_double(): Get an number mapped by 'key'
*
* This function assumes that 'key' exists and it stores a
* QFloat or QInt object.
*
* Return number mapped by 'key'.
*/
double qdict_get_double(const QDict *qdict, const char *key)
{
    QObject *obj = qdict_get(qdict, key);

    assert(obj);
    switch (qobject_type(obj)) {
    case QTYPE_QFLOAT:
        return qfloat_get_double(qobject_to_qfloat(obj));
    case QTYPE_QINT:
        return qint_get_int(qobject_to_qint(obj));
    default:
        abort();
    }
}

/**
* qdict_get_int(): Get an integer mapped by 'key'
*
* This function assumes that 'key' exists and it stores a
* QInt object.
*
* Return integer mapped by 'key'.
*/
int64_t qdict_get_int(const QDict *qdict, const char *key)
{
    QObject *obj = qdict_get_obj(qdict, key, QTYPE_QINT);
    return qint_get_int(qobject_to_qint(obj));
}

/**
* qdict_get_bool(): Get a bool mapped by 'key'
*
* This function assumes that 'key' exists and it stores a
* QBool object.
*
* Return bool mapped by 'key'.
*/
int qdict_get_bool(const QDict *qdict, const char *key)
{
    QObject *obj = qdict_get_obj(qdict, key, QTYPE_QBOOL);
    return qbool_get_int(qobject_to_qbool(obj));
}

/**
* qdict_get_qlist(): Get the QList mapped by 'key'
*
* This function assumes that 'key' exists and it stores a
* QList object.
*
* Return QList mapped by 'key'.
*/
QList *qdict_get_qlist(const QDict *qdict, const char *key)
{
    return qobject_to_qlist(qdict_get_obj(qdict, key, QTYPE_QLIST));
}

/**
* qdict_get_qdict(): Get the QDict mapped by 'key'
*
* This function assumes that 'key' exists and it stores a
* QDict object.
*
* Return QDict mapped by 'key'.
*/
QDict *qdict_get_qdict(const QDict *qdict, const char *key)
{
    return qobject_to_qdict(qdict_get_obj(qdict, key, QTYPE_QDICT));
}

/**
* qdict_get_str(): Get a pointer to the stored string mapped
* by 'key'
*
* This function assumes that 'key' exists and it stores a
* QString object.
*
* Return pointer to the string mapped by 'key'.
*/
const char *qdict_get_str(const QDict *qdict, const char *key)
{
    QObject *obj = qdict_get_obj(qdict, key, QTYPE_QSTRING);
    return qstring_get_str(qobject_to_qstring(obj));
}

/**
* qdict_get_try_int(): Try to get integer mapped by 'key'
*
* Return integer mapped by 'key', if it is not present in
* the dictionary or if the stored object is not of QInt type
* 'def_value' will be returned.
*/
int64_t qdict_get_try_int(const QDict *qdict, const char *key,
                          int64_t def_value)
{
    QObject *obj;

    obj = qdict_get(qdict, key);
    if (!obj || qobject_type(obj) != QTYPE_QINT)
        return def_value;

    return qint_get_int(qobject_to_qint(obj));
}

/**
* qdict_get_try_bool(): Try to get a bool mapped by 'key'
*
* Return bool mapped by 'key', if it is not present in the
* dictionary or if the stored object is not of QBool type
* 'def_value' will be returned.
*/
int qdict_get_try_bool(const QDict *qdict, const char *key, int def_value)
{
    QObject *obj;

    obj = qdict_get(qdict, key);
    if (!obj || qobject_type(obj) != QTYPE_QBOOL)
        return def_value;

    return qbool_get_int(qobject_to_qbool(obj));
}

/**
* qdict_get_try_str(): Try to get a pointer to the stored string
* mapped by 'key'
*
* Return a pointer to the string mapped by 'key', if it is not present
* in the dictionary or if the stored object is not of QString type
* NULL will be returned.
*/
const char *qdict_get_try_str(const QDict *qdict, const char *key)
{
    QObject *obj;

    obj = qdict_get(qdict, key);
    if (!obj || qobject_type(obj) != QTYPE_QSTRING)
        return NULL;

    return qstring_get_str(qobject_to_qstring(obj));
}

/**
* qdict_iter(): Iterate over all the dictionary's stored values.
*
* This function allows the user to provide an iterator, which will be
* called for each stored value in the dictionary.
*/
void qdict_iter(const QDict *qdict,
                void (*iter)(const char *key, QObject *obj, void *opaque),
                void *opaque)
{
    int i;
    QDictEntry *entry;

    for (i = 0; i < QDICT_BUCKET_MAX; i++) {
        QLIST_FOREACH(entry, &qdict->table[i], next)
            iter(entry->key, entry->value, opaque);
    }
}

static QDictEntry *qdict_next_entry(const QDict *qdict, int first_bucket)
{
    int i;

    for (i = first_bucket; i < QDICT_BUCKET_MAX; i++) {
        if (!QLIST_EMPTY(&qdict->table[i])) {
            return QLIST_FIRST(&qdict->table[i]);
        }
    }

    return NULL;
}

/**
* qdict_first(): Return first qdict entry for iteration.
*/
const QDictEntry *qdict_first(const QDict *qdict)
{
    return qdict_next_entry(qdict, 0);
}

/**
* qdict_next(): Return next qdict entry in an iteration.
*/
const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry)
{
    QDictEntry *ret;

    ret = QLIST_NEXT(entry, next);
    if (!ret) {
        unsigned int bucket = tdb_hash(entry->key) % QDICT_BUCKET_MAX;
        ret = qdict_next_entry(qdict, bucket + 1);
    }

    return ret;
}

/**
* qentry_destroy(): Free all the memory allocated by a QDictEntry
*/
static void qentry_destroy(QDictEntry *e)
{
    assert(e != NULL);
    assert(e->key != NULL);
    assert(e->value != NULL);

    qobject_decref(e->value);
    qemu_free(e->key);
    qemu_free(e);
}

/**
* qdict_del(): Delete a 'key:value' pair from the dictionary
*
* This will destroy all data allocated by this entry.
*/
void qdict_del(QDict *qdict, const char *key)
{
    QDictEntry *entry;

    entry = qdict_find(qdict, key, tdb_hash(key) % QDICT_BUCKET_MAX);
    if (entry) {
        QLIST_REMOVE(entry, next);
        qentry_destroy(entry);
        qdict->size--;
    }
}

/**
* qdict_destroy_obj(): Free all the memory allocated by a QDict
*/
static void qdict_destroy_obj(QObject *obj)
{
    int i;
    QDict *qdict;

    assert(obj != NULL);
    qdict = qobject_to_qdict(obj);

    for (i = 0; i < QDICT_BUCKET_MAX; i++) {
        QDictEntry *entry = QLIST_FIRST(&qdict->table[i]);
        while (entry) {
            QDictEntry *tmp = QLIST_NEXT(entry, next);
            QLIST_REMOVE(entry, next);
            qentry_destroy(entry);
            entry = tmp;
        }
    }

    qemu_free(qdict);
}
Something went wrong with that request. Please try again.