From 2910f183ddd5286911bc1e3499ea93cb57de8b75 Mon Sep 17 00:00:00 2001 From: David 'Digit' Turner Date: Mon, 10 May 2010 18:48:35 -0700 Subject: Upstream: Misc integration - includes qobject.h and related sources Change-Id: Idfa93ab5c67c95a3bc1869eeaf3a84a75fe24cd6 --- qdict.c | 356 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 356 insertions(+) create mode 100644 qdict.c (limited to 'qdict.c') diff --git a/qdict.c b/qdict.c new file mode 100644 index 0000000..c6a5a42 --- /dev/null +++ b/qdict.c @@ -0,0 +1,356 @@ +/* + * QDict data type. + * + * Copyright (C) 2009 Red Hat Inc. + * + * Authors: + * Luiz Capitulino + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include "qint.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_find(): List lookup function + */ +static QDictEntry *qdict_find(const QDict *qdict, + const char *key, unsigned int hash) +{ + QDictEntry *entry; + + QLIST_FOREACH(entry, &qdict->table[hash], 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 hash; + QDictEntry *entry; + + hash = tdb_hash(key) % QDICT_HASH_SIZE; + entry = qdict_find(qdict, key, hash); + 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[hash], 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_HASH_SIZE); + 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 hash = tdb_hash(key) % QDICT_HASH_SIZE; + return (qdict_find(qdict, key, hash) == 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_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 + * 'err_value' will be returned. + */ +int64_t qdict_get_try_int(const QDict *qdict, const char *key, + int64_t err_value) +{ + QObject *obj; + + obj = qdict_get(qdict, key); + if (!obj || qobject_type(obj) != QTYPE_QINT) + return err_value; + + return qint_get_int(qobject_to_qint(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_HASH_SIZE; i++) { + QLIST_FOREACH(entry, &qdict->table[i], next) + iter(entry->key, entry->value, opaque); + } +} + +/** + * 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_HASH_SIZE); + 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_HASH_SIZE; 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); +} -- cgit v1.1