mirror of https://gitee.com/openkylin/qemu.git
442 lines
10 KiB
C
442 lines
10 KiB
C
/*
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* QDict Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/qmp/qnum.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qbool.h"
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#include "qapi/qmp/qnull.h"
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#include "qapi/qmp/qstring.h"
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/**
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* qdict_new(): Create a new QDict
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*
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* Return strong reference.
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*/
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QDict *qdict_new(void)
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{
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QDict *qdict;
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qdict = g_malloc0(sizeof(*qdict));
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qobject_init(QOBJECT(qdict), QTYPE_QDICT);
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return qdict;
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}
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/**
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* tdb_hash(): based on the hash algorithm from gdbm, via tdb
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* (from module-init-tools)
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*/
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static unsigned int tdb_hash(const char *name)
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{
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unsigned value; /* Used to compute the hash value. */
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unsigned i; /* Used to cycle through random values. */
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/* Set the initial value from the key size. */
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for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++)
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value = (value + (((const unsigned char *)name)[i] << (i*5 % 24)));
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return (1103515243 * value + 12345);
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}
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/**
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* alloc_entry(): allocate a new QDictEntry
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*/
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static QDictEntry *alloc_entry(const char *key, QObject *value)
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{
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QDictEntry *entry;
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entry = g_malloc0(sizeof(*entry));
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entry->key = g_strdup(key);
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entry->value = value;
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return entry;
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}
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/**
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* qdict_entry_value(): Return qdict entry value
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*
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* Return weak reference.
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*/
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QObject *qdict_entry_value(const QDictEntry *entry)
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{
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return entry->value;
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}
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/**
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* qdict_entry_key(): Return qdict entry key
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*
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* Return a *pointer* to the string, it has to be duplicated before being
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* stored.
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*/
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const char *qdict_entry_key(const QDictEntry *entry)
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{
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return entry->key;
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}
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/**
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* qdict_find(): List lookup function
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*/
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static QDictEntry *qdict_find(const QDict *qdict,
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const char *key, unsigned int bucket)
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{
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QDictEntry *entry;
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QLIST_FOREACH(entry, &qdict->table[bucket], next)
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if (!strcmp(entry->key, key))
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return entry;
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return NULL;
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}
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/**
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* qdict_put_obj(): Put a new QObject into the dictionary
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*
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* Insert the pair 'key:value' into 'qdict', if 'key' already exists
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* its 'value' will be replaced.
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*
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* This is done by freeing the reference to the stored QObject and
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* storing the new one in the same entry.
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*
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* NOTE: ownership of 'value' is transferred to the QDict
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*/
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void qdict_put_obj(QDict *qdict, const char *key, QObject *value)
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{
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unsigned int bucket;
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QDictEntry *entry;
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bucket = tdb_hash(key) % QDICT_BUCKET_MAX;
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entry = qdict_find(qdict, key, bucket);
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if (entry) {
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/* replace key's value */
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qobject_unref(entry->value);
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entry->value = value;
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} else {
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/* allocate a new entry */
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entry = alloc_entry(key, value);
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QLIST_INSERT_HEAD(&qdict->table[bucket], entry, next);
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qdict->size++;
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}
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}
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void qdict_put_int(QDict *qdict, const char *key, int64_t value)
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{
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qdict_put(qdict, key, qnum_from_int(value));
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}
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void qdict_put_bool(QDict *qdict, const char *key, bool value)
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{
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qdict_put(qdict, key, qbool_from_bool(value));
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}
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void qdict_put_str(QDict *qdict, const char *key, const char *value)
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{
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qdict_put(qdict, key, qstring_from_str(value));
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}
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void qdict_put_null(QDict *qdict, const char *key)
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{
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qdict_put(qdict, key, qnull());
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}
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/**
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* qdict_get(): Lookup for a given 'key'
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*
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* Return a weak reference to the QObject associated with 'key' if
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* 'key' is present in the dictionary, NULL otherwise.
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*/
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QObject *qdict_get(const QDict *qdict, const char *key)
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{
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QDictEntry *entry;
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entry = qdict_find(qdict, key, tdb_hash(key) % QDICT_BUCKET_MAX);
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return (entry == NULL ? NULL : entry->value);
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}
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/**
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* qdict_haskey(): Check if 'key' exists
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*
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* Return 1 if 'key' exists in the dict, 0 otherwise
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*/
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int qdict_haskey(const QDict *qdict, const char *key)
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{
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unsigned int bucket = tdb_hash(key) % QDICT_BUCKET_MAX;
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return (qdict_find(qdict, key, bucket) == NULL ? 0 : 1);
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}
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/**
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* qdict_size(): Return the size of the dictionary
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*/
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size_t qdict_size(const QDict *qdict)
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{
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return qdict->size;
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}
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/**
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* qdict_get_double(): Get an number mapped by 'key'
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*
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* This function assumes that 'key' exists and it stores a QNum.
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*
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* Return number mapped by 'key'.
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*/
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double qdict_get_double(const QDict *qdict, const char *key)
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{
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return qnum_get_double(qobject_to(QNum, qdict_get(qdict, key)));
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}
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/**
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* qdict_get_int(): Get an integer mapped by 'key'
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*
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* This function assumes that 'key' exists and it stores a
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* QNum representable as int.
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*
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* Return integer mapped by 'key'.
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*/
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int64_t qdict_get_int(const QDict *qdict, const char *key)
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{
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return qnum_get_int(qobject_to(QNum, qdict_get(qdict, key)));
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}
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/**
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* qdict_get_bool(): Get a bool mapped by 'key'
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*
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* This function assumes that 'key' exists and it stores a
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* QBool object.
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*
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* Return bool mapped by 'key'.
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*/
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bool qdict_get_bool(const QDict *qdict, const char *key)
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{
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return qbool_get_bool(qobject_to(QBool, qdict_get(qdict, key)));
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}
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/**
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* qdict_get_qlist(): If @qdict maps @key to a QList, return it, else NULL.
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*/
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QList *qdict_get_qlist(const QDict *qdict, const char *key)
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{
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return qobject_to(QList, qdict_get(qdict, key));
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}
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/**
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* qdict_get_qdict(): If @qdict maps @key to a QDict, return it, else NULL.
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*/
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QDict *qdict_get_qdict(const QDict *qdict, const char *key)
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{
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return qobject_to(QDict, qdict_get(qdict, key));
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}
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/**
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* qdict_get_str(): Get a pointer to the stored string mapped
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* by 'key'
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*
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* This function assumes that 'key' exists and it stores a
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* QString object.
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*
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* Return pointer to the string mapped by 'key'.
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*/
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const char *qdict_get_str(const QDict *qdict, const char *key)
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{
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return qstring_get_str(qobject_to(QString, qdict_get(qdict, key)));
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}
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/**
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* qdict_get_try_int(): Try to get integer mapped by 'key'
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*
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* Return integer mapped by 'key', if it is not present in the
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* dictionary or if the stored object is not a QNum representing an
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* integer, 'def_value' will be returned.
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*/
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int64_t qdict_get_try_int(const QDict *qdict, const char *key,
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int64_t def_value)
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{
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QNum *qnum = qobject_to(QNum, qdict_get(qdict, key));
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int64_t val;
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if (!qnum || !qnum_get_try_int(qnum, &val)) {
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return def_value;
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}
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return val;
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}
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/**
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* qdict_get_try_bool(): Try to get a bool mapped by 'key'
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*
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* Return bool mapped by 'key', if it is not present in the
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* dictionary or if the stored object is not of QBool type
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* 'def_value' will be returned.
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*/
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bool qdict_get_try_bool(const QDict *qdict, const char *key, bool def_value)
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{
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QBool *qbool = qobject_to(QBool, qdict_get(qdict, key));
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return qbool ? qbool_get_bool(qbool) : def_value;
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}
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/**
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* qdict_get_try_str(): Try to get a pointer to the stored string
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* mapped by 'key'
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*
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* Return a pointer to the string mapped by 'key', if it is not present
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* in the dictionary or if the stored object is not of QString type
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* NULL will be returned.
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*/
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const char *qdict_get_try_str(const QDict *qdict, const char *key)
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{
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QString *qstr = qobject_to(QString, qdict_get(qdict, key));
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return qstr ? qstring_get_str(qstr) : NULL;
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}
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static QDictEntry *qdict_next_entry(const QDict *qdict, int first_bucket)
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{
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int i;
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for (i = first_bucket; i < QDICT_BUCKET_MAX; i++) {
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if (!QLIST_EMPTY(&qdict->table[i])) {
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return QLIST_FIRST(&qdict->table[i]);
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}
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}
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return NULL;
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}
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/**
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* qdict_first(): Return first qdict entry for iteration.
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*/
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const QDictEntry *qdict_first(const QDict *qdict)
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{
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return qdict_next_entry(qdict, 0);
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}
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/**
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* qdict_next(): Return next qdict entry in an iteration.
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*/
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const QDictEntry *qdict_next(const QDict *qdict, const QDictEntry *entry)
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{
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QDictEntry *ret;
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ret = QLIST_NEXT(entry, next);
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if (!ret) {
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unsigned int bucket = tdb_hash(entry->key) % QDICT_BUCKET_MAX;
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ret = qdict_next_entry(qdict, bucket + 1);
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}
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return ret;
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}
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/**
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* qdict_clone_shallow(): Clones a given QDict. Its entries are not copied, but
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* another reference is added.
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*/
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QDict *qdict_clone_shallow(const QDict *src)
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{
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QDict *dest;
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QDictEntry *entry;
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int i;
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dest = qdict_new();
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for (i = 0; i < QDICT_BUCKET_MAX; i++) {
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QLIST_FOREACH(entry, &src->table[i], next) {
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qdict_put_obj(dest, entry->key, qobject_ref(entry->value));
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}
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}
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return dest;
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}
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/**
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* qentry_destroy(): Free all the memory allocated by a QDictEntry
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*/
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static void qentry_destroy(QDictEntry *e)
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{
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assert(e != NULL);
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assert(e->key != NULL);
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assert(e->value != NULL);
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qobject_unref(e->value);
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g_free(e->key);
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g_free(e);
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}
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/**
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* qdict_del(): Delete a 'key:value' pair from the dictionary
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*
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* This will destroy all data allocated by this entry.
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*/
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void qdict_del(QDict *qdict, const char *key)
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{
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QDictEntry *entry;
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entry = qdict_find(qdict, key, tdb_hash(key) % QDICT_BUCKET_MAX);
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if (entry) {
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QLIST_REMOVE(entry, next);
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qentry_destroy(entry);
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qdict->size--;
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}
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}
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/**
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* qdict_is_equal(): Test whether the two QDicts are equal
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*
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* Here, equality means whether they contain the same keys and whether
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* the respective values are in turn equal (i.e. invoking
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* qobject_is_equal() on them yields true).
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*/
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bool qdict_is_equal(const QObject *x, const QObject *y)
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{
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const QDict *dict_x = qobject_to(QDict, x);
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const QDict *dict_y = qobject_to(QDict, y);
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const QDictEntry *e;
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if (qdict_size(dict_x) != qdict_size(dict_y)) {
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return false;
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}
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for (e = qdict_first(dict_x); e; e = qdict_next(dict_x, e)) {
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const QObject *obj_x = qdict_entry_value(e);
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const QObject *obj_y = qdict_get(dict_y, qdict_entry_key(e));
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if (!qobject_is_equal(obj_x, obj_y)) {
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return false;
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}
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}
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return true;
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}
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/**
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* qdict_destroy_obj(): Free all the memory allocated by a QDict
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*/
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void qdict_destroy_obj(QObject *obj)
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{
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int i;
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QDict *qdict;
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assert(obj != NULL);
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qdict = qobject_to(QDict, obj);
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for (i = 0; i < QDICT_BUCKET_MAX; i++) {
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QDictEntry *entry = QLIST_FIRST(&qdict->table[i]);
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while (entry) {
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QDictEntry *tmp = QLIST_NEXT(entry, next);
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QLIST_REMOVE(entry, next);
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qentry_destroy(entry);
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entry = tmp;
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}
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}
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g_free(qdict);
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}
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