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9c52681277
This function joins two QDicts by absorbing one into the other. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
700 lines
18 KiB
C
700 lines
18 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 "qapi/qmp/qint.h"
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#include "qapi/qmp/qfloat.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/qstring.h"
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#include "qapi/qmp/qobject.h"
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#include "qemu/queue.h"
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#include "qemu-common.h"
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static void qdict_destroy_obj(QObject *obj);
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static const QType qdict_type = {
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.code = QTYPE_QDICT,
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.destroy = qdict_destroy_obj,
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};
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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(qdict, &qdict_type);
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return qdict;
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}
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/**
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* qobject_to_qdict(): Convert a QObject into a QDict
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*/
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QDict *qobject_to_qdict(const QObject *obj)
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{
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if (qobject_type(obj) != QTYPE_QDICT)
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return NULL;
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return container_of(obj, QDict, base);
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}
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/**
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* tdb_hash(): based on the hash agorithm 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_decref(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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/**
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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_obj(): Get a QObject of a specific type
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*/
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static QObject *qdict_get_obj(const QDict *qdict, const char *key,
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qtype_code type)
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{
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QObject *obj;
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obj = qdict_get(qdict, key);
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assert(obj != NULL);
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assert(qobject_type(obj) == type);
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return obj;
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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
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* QFloat or QInt object.
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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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QObject *obj = qdict_get(qdict, key);
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assert(obj);
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switch (qobject_type(obj)) {
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case QTYPE_QFLOAT:
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return qfloat_get_double(qobject_to_qfloat(obj));
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case QTYPE_QINT:
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return qint_get_int(qobject_to_qint(obj));
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default:
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abort();
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}
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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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* QInt object.
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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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QObject *obj = qdict_get_obj(qdict, key, QTYPE_QINT);
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return qint_get_int(qobject_to_qint(obj));
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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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int qdict_get_bool(const QDict *qdict, const char *key)
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{
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QObject *obj = qdict_get_obj(qdict, key, QTYPE_QBOOL);
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return qbool_get_int(qobject_to_qbool(obj));
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}
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/**
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* qdict_get_qlist(): Get the QList 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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* QList object.
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*
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* Return QList mapped by 'key'.
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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_obj(qdict, key, QTYPE_QLIST));
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}
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/**
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* qdict_get_qdict(): Get the QDict 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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* QDict object.
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*
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* Return QDict mapped by 'key'.
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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_obj(qdict, key, QTYPE_QDICT));
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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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QObject *obj = qdict_get_obj(qdict, key, QTYPE_QSTRING);
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return qstring_get_str(qobject_to_qstring(obj));
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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
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* the dictionary or if the stored object is not of QInt type
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* '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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QObject *obj;
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obj = qdict_get(qdict, key);
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if (!obj || qobject_type(obj) != QTYPE_QINT)
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return def_value;
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return qint_get_int(qobject_to_qint(obj));
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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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int qdict_get_try_bool(const QDict *qdict, const char *key, int def_value)
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{
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QObject *obj;
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obj = qdict_get(qdict, key);
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if (!obj || qobject_type(obj) != QTYPE_QBOOL)
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return def_value;
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return qbool_get_int(qobject_to_qbool(obj));
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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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QObject *obj;
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obj = qdict_get(qdict, key);
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if (!obj || qobject_type(obj) != QTYPE_QSTRING)
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return NULL;
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return qstring_get_str(qobject_to_qstring(obj));
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}
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/**
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* qdict_iter(): Iterate over all the dictionary's stored values.
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*
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* This function allows the user to provide an iterator, which will be
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* called for each stored value in the dictionary.
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*/
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void qdict_iter(const QDict *qdict,
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void (*iter)(const char *key, QObject *obj, void *opaque),
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void *opaque)
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{
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int i;
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QDictEntry *entry;
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for (i = 0; i < QDICT_BUCKET_MAX; i++) {
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QLIST_FOREACH(entry, &qdict->table[i], next)
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iter(entry->key, entry->value, opaque);
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}
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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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qobject_incref(entry->value);
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qdict_put_obj(dest, entry->key, 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_decref(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_destroy_obj(): Free all the memory allocated by a QDict
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*/
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static 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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static void qdict_flatten_qdict(QDict *qdict, QDict *target,
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const char *prefix);
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static void qdict_flatten_qlist(QList *qlist, QDict *target, const char *prefix)
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{
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QObject *value;
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const QListEntry *entry;
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char *new_key;
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int i;
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/* This function is never called with prefix == NULL, i.e., it is always
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* called from within qdict_flatten_q(list|dict)(). Therefore, it does not
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* need to remove list entries during the iteration (the whole list will be
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* deleted eventually anyway from qdict_flatten_qdict()). */
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assert(prefix);
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entry = qlist_first(qlist);
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for (i = 0; entry; entry = qlist_next(entry), i++) {
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value = qlist_entry_obj(entry);
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new_key = g_strdup_printf("%s.%i", prefix, i);
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if (qobject_type(value) == QTYPE_QDICT) {
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qdict_flatten_qdict(qobject_to_qdict(value), target, new_key);
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} else if (qobject_type(value) == QTYPE_QLIST) {
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qdict_flatten_qlist(qobject_to_qlist(value), target, new_key);
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} else {
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/* All other types are moved to the target unchanged. */
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qobject_incref(value);
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qdict_put_obj(target, new_key, value);
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}
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g_free(new_key);
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}
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}
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static void qdict_flatten_qdict(QDict *qdict, QDict *target, const char *prefix)
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{
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QObject *value;
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const QDictEntry *entry, *next;
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char *new_key;
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bool delete;
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entry = qdict_first(qdict);
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while (entry != NULL) {
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next = qdict_next(qdict, entry);
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value = qdict_entry_value(entry);
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new_key = NULL;
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delete = false;
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if (prefix) {
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new_key = g_strdup_printf("%s.%s", prefix, entry->key);
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}
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if (qobject_type(value) == QTYPE_QDICT) {
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/* Entries of QDicts are processed recursively, the QDict object
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* itself disappears. */
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qdict_flatten_qdict(qobject_to_qdict(value), target,
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|
new_key ? new_key : entry->key);
|
|
delete = true;
|
|
} else if (qobject_type(value) == QTYPE_QLIST) {
|
|
qdict_flatten_qlist(qobject_to_qlist(value), target,
|
|
new_key ? new_key : entry->key);
|
|
delete = true;
|
|
} else if (prefix) {
|
|
/* All other objects are moved to the target unchanged. */
|
|
qobject_incref(value);
|
|
qdict_put_obj(target, new_key, value);
|
|
delete = true;
|
|
}
|
|
|
|
g_free(new_key);
|
|
|
|
if (delete) {
|
|
qdict_del(qdict, entry->key);
|
|
|
|
/* Restart loop after modifying the iterated QDict */
|
|
entry = qdict_first(qdict);
|
|
continue;
|
|
}
|
|
|
|
entry = next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdict_flatten(): For each nested QDict with key x, all fields with key y
|
|
* are moved to this QDict and their key is renamed to "x.y". For each nested
|
|
* QList with key x, the field at index y is moved to this QDict with the key
|
|
* "x.y" (i.e., the reverse of what qdict_array_split() does).
|
|
* This operation is applied recursively for nested QDicts and QLists.
|
|
*/
|
|
void qdict_flatten(QDict *qdict)
|
|
{
|
|
qdict_flatten_qdict(qdict, qdict, NULL);
|
|
}
|
|
|
|
/* extract all the src QDict entries starting by start into dst */
|
|
void qdict_extract_subqdict(QDict *src, QDict **dst, const char *start)
|
|
|
|
{
|
|
const QDictEntry *entry, *next;
|
|
const char *p;
|
|
|
|
*dst = qdict_new();
|
|
entry = qdict_first(src);
|
|
|
|
while (entry != NULL) {
|
|
next = qdict_next(src, entry);
|
|
if (strstart(entry->key, start, &p)) {
|
|
qobject_incref(entry->value);
|
|
qdict_put_obj(*dst, p, entry->value);
|
|
qdict_del(src, entry->key);
|
|
}
|
|
entry = next;
|
|
}
|
|
}
|
|
|
|
static bool qdict_has_prefixed_entries(const QDict *src, const char *start)
|
|
{
|
|
const QDictEntry *entry;
|
|
|
|
for (entry = qdict_first(src); entry; entry = qdict_next(src, entry)) {
|
|
if (strstart(entry->key, start, NULL)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* qdict_array_split(): This function moves array-like elements of a QDict into
|
|
* a new QList. Every entry in the original QDict with a key "%u" or one
|
|
* prefixed "%u.", where %u designates an unsigned integer starting at 0 and
|
|
* incrementally counting up, will be moved to a new QDict at index %u in the
|
|
* output QList with the key prefix removed, if that prefix is "%u.". If the
|
|
* whole key is just "%u", the whole QObject will be moved unchanged without
|
|
* creating a new QDict. The function terminates when there is no entry in the
|
|
* QDict with a prefix directly (incrementally) following the last one; it also
|
|
* returns if there are both entries with "%u" and "%u." for the same index %u.
|
|
* Example: {"0.a": 42, "0.b": 23, "1.x": 0, "4.y": 1, "o.o": 7, "2": 66}
|
|
* (or {"1.x": 0, "4.y": 1, "0.a": 42, "o.o": 7, "0.b": 23, "2": 66})
|
|
* => [{"a": 42, "b": 23}, {"x": 0}, 66]
|
|
* and {"4.y": 1, "o.o": 7} (remainder of the old QDict)
|
|
*/
|
|
void qdict_array_split(QDict *src, QList **dst)
|
|
{
|
|
unsigned i;
|
|
|
|
*dst = qlist_new();
|
|
|
|
for (i = 0; i < UINT_MAX; i++) {
|
|
QObject *subqobj;
|
|
bool is_subqdict;
|
|
QDict *subqdict;
|
|
char indexstr[32], prefix[32];
|
|
size_t snprintf_ret;
|
|
|
|
snprintf_ret = snprintf(indexstr, 32, "%u", i);
|
|
assert(snprintf_ret < 32);
|
|
|
|
subqobj = qdict_get(src, indexstr);
|
|
|
|
snprintf_ret = snprintf(prefix, 32, "%u.", i);
|
|
assert(snprintf_ret < 32);
|
|
|
|
is_subqdict = qdict_has_prefixed_entries(src, prefix);
|
|
|
|
// There may be either a single subordinate object (named "%u") or
|
|
// multiple objects (each with a key prefixed "%u."), but not both.
|
|
if (!subqobj == !is_subqdict) {
|
|
break;
|
|
}
|
|
|
|
if (is_subqdict) {
|
|
qdict_extract_subqdict(src, &subqdict, prefix);
|
|
assert(qdict_size(subqdict) > 0);
|
|
} else {
|
|
qobject_incref(subqobj);
|
|
qdict_del(src, indexstr);
|
|
}
|
|
|
|
qlist_append_obj(*dst, subqobj ?: QOBJECT(subqdict));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* qdict_join(): Absorb the src QDict into the dest QDict, that is, move all
|
|
* elements from src to dest.
|
|
*
|
|
* If an element from src has a key already present in dest, it will not be
|
|
* moved unless overwrite is true.
|
|
*
|
|
* If overwrite is true, the conflicting values in dest will be discarded and
|
|
* replaced by the corresponding values from src.
|
|
*
|
|
* Therefore, with overwrite being true, the src QDict will always be empty when
|
|
* this function returns. If overwrite is false, the src QDict will be empty
|
|
* iff there were no conflicts.
|
|
*/
|
|
void qdict_join(QDict *dest, QDict *src, bool overwrite)
|
|
{
|
|
const QDictEntry *entry, *next;
|
|
|
|
entry = qdict_first(src);
|
|
while (entry) {
|
|
next = qdict_next(src, entry);
|
|
|
|
if (overwrite || !qdict_haskey(dest, entry->key)) {
|
|
qobject_incref(entry->value);
|
|
qdict_put_obj(dest, entry->key, entry->value);
|
|
qdict_del(src, entry->key);
|
|
}
|
|
|
|
entry = next;
|
|
}
|
|
}
|