/*
* 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 "qemu/osdep.h"
#include "qapi/qmp/qnum.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qbool.h"
#include "qapi/qmp/qnull.h"
#include "qapi/qmp/qstring.h"
/**
* qdict_new(): Create a new QDict
*
* Return strong reference.
*/
QDict *qdict_new(void)
{
QDict *qdict;
qdict = g_malloc0(sizeof(*qdict));
qobject_init(QOBJECT(qdict), QTYPE_QDICT);
return qdict;
}
/**
* tdb_hash(): based on the hash algorithm 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 = g_malloc0(sizeof(*entry));
entry->key = g_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_unref(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++;
}
}
void qdict_put_int(QDict *qdict, const char *key, int64_t value)
{
qdict_put(qdict, key, qnum_from_int(value));
}
void qdict_put_bool(QDict *qdict, const char *key, bool value)
{
qdict_put(qdict, key, qbool_from_bool(value));
}
void qdict_put_str(QDict *qdict, const char *key, const char *value)
{
qdict_put(qdict, key, qstring_from_str(value));
}
void qdict_put_null(QDict *qdict, const char *key)
{
qdict_put(qdict, key, qnull());
}
/**
* 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_double(): Get an number mapped by 'key'
*
* This function assumes that 'key' exists and it stores a QNum.
*
* Return number mapped by 'key'.
*/
double qdict_get_double(const QDict *qdict, const char *key)
{
return qnum_get_double(qobject_to(QNum, qdict_get(qdict, key)));
}
/**
* qdict_get_int(): Get an integer mapped by 'key'
*
* This function assumes that 'key' exists and it stores a
* QNum representable as int.
*
* Return integer mapped by 'key'.
*/
int64_t qdict_get_int(const QDict *qdict, const char *key)
{
return qnum_get_int(qobject_to(QNum, qdict_get(qdict, key)));
}
/**
* 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'.
*/
bool qdict_get_bool(const QDict *qdict, const char *key)
{
return qbool_get_bool(qobject_to(QBool, qdict_get(qdict, key)));
}
/**
* qdict_get_qlist(): If @qdict maps @key to a QList, return it, else NULL.
*/
QList *qdict_get_qlist(const QDict *qdict, const char *key)
{
return qobject_to(QList, qdict_get(qdict, key));
}
/**
* qdict_get_qdict(): If @qdict maps @key to a QDict, return it, else NULL.
*/
QDict *qdict_get_qdict(const QDict *qdict, const char *key)
{
return qobject_to(QDict, qdict_get(qdict, key));
}
/**
* 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)
{
return qstring_get_str(qobject_to(QString, qdict_get(qdict, key)));
}
/**
* 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 a QNum representing an
* integer, 'def_value' will be returned.
*/
int64_t qdict_get_try_int(const QDict *qdict, const char *key,
int64_t def_value)
{
QNum *qnum = qobject_to(QNum, qdict_get(qdict, key));
int64_t val;
if (!qnum || !qnum_get_try_int(qnum, &val)) {
return def_value;
}
return val;
}
/**
* 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.
*/
bool qdict_get_try_bool(const QDict *qdict, const char *key, bool def_value)
{
QBool *qbool = qobject_to(QBool, qdict_get(qdict, key));
return qbool ? qbool_get_bool(qbool) : def_value;
}
/**
* 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)
{
QString *qstr = qobject_to(QString, qdict_get(qdict, key));
return qstr ? qstring_get_str(qstr) : NULL;
}
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;
}
/**
* qdict_clone_shallow(): Clones a given QDict. Its entries are not copied, but
* another reference is added.
*/
QDict *qdict_clone_shallow(const QDict *src)
{
QDict *dest;
QDictEntry *entry;
int i;
dest = qdict_new();
for (i = 0; i < QDICT_BUCKET_MAX; i++) {
QLIST_FOREACH(entry, &src->table[i], next) {
qdict_put_obj(dest, entry->key, qobject_ref(entry->value));
}
}
return dest;
}
/**
* 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_unref(e->value);
g_free(e->key);
g_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_is_equal(): Test whether the two QDicts are equal
*
* Here, equality means whether they contain the same keys and whether
* the respective values are in turn equal (i.e. invoking
* qobject_is_equal() on them yields true).
*/
bool qdict_is_equal(const QObject *x, const QObject *y)
{
const QDict *dict_x = qobject_to(QDict, x);
const QDict *dict_y = qobject_to(QDict, y);
const QDictEntry *e;
if (qdict_size(dict_x) != qdict_size(dict_y)) {
return false;
}
for (e = qdict_first(dict_x); e; e = qdict_next(dict_x, e)) {
const QObject *obj_x = qdict_entry_value(e);
const QObject *obj_y = qdict_get(dict_y, qdict_entry_key(e));
if (!qobject_is_equal(obj_x, obj_y)) {
return false;
}
}
return true;
}
/**
* qdict_destroy_obj(): Free all the memory allocated by a QDict
*/
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;
}
}
g_free(qdict);
}
