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[Qemu-devel] [PATCH 04/29] Introduce QDict
From: |
Luiz Capitulino |
Subject: |
[Qemu-devel] [PATCH 04/29] Introduce QDict |
Date: |
Thu, 13 Aug 2009 10:50:03 -0300 |
QDict is a high-level dictionary data type that can be used to store a
collection of QObjects. A unique key is associated with only one
QObject.
The following functions are available:
- qdict_new() Create a new dictionary
- qdict_add() Add a new 'key:object' pair
- qdict_get() Get the QObject of a given key
- qdict_del() Delete a 'key:object' pair
- qdict_size() Return the size of the dictionary
- qdict_exists() Check if a given 'key' exists
Some high-level helpers to operate on QStrings and QInts objects
are also provided.
Signed-off-by: Luiz Capitulino <address@hidden>
---
Makefile | 2 +-
qdict.c | 300 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
qdict.h | 47 ++++++++++
qobject.h | 1 +
4 files changed, 349 insertions(+), 1 deletions(-)
create mode 100644 qdict.c
create mode 100644 qdict.h
diff --git a/Makefile b/Makefile
index 47cc532..2310a31 100644
--- a/Makefile
+++ b/Makefile
@@ -90,7 +90,7 @@ obj-y += buffered_file.o migration.o migration-tcp.o net.o
qemu-sockets.o
obj-y += qemu-char.o aio.o net-checksum.o savevm.o
obj-y += msmouse.o ps2.o
obj-y += qdev.o qdev-properties.o ssi.o
-obj-y += qint.o qstring.o
+obj-y += qint.o qstring.o qdict.o
obj-$(CONFIG_BRLAPI) += baum.o
obj-$(CONFIG_WIN32) += tap-win32.o
diff --git a/qdict.c b/qdict.c
new file mode 100644
index 0000000..9a75e3c
--- /dev/null
+++ b/qdict.c
@@ -0,0 +1,300 @@
+/*
+ * QDict data type.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ * Luiz Capitulino <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qdict.h"
+#include "qobject.h"
+#include "qemu-common.h"
+
+static QType qdict_type;
+
+/**
+ * qdict_new(): Create a new dictionary data-type
+ *
+ * Return new reference.
+ */
+QDict *qdict_new(void)
+{
+ QDict *qdict;
+
+ qdict = qemu_mallocz(sizeof(*qdict));
+ qobject_init(QOBJECT(qdict), &qdict_type);
+
+ return qdict;
+}
+
+/**
+ * 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 *next)
+{
+ QDictEntry *entry;
+
+ entry = qemu_malloc(sizeof(*entry));
+ entry->key = qemu_strdup(key);
+ entry->value = value;
+ entry->next = next;
+
+ return entry;
+}
+
+/**
+ * qdict_find(): Low-level lookup function
+ */
+static void *qdict_find(const QDict *qdict,
+ const char *key, unsigned int hash)
+{
+ QDictEntry *e;
+
+ for (e = qdict->table[hash]; e; e = e->next)
+ if (!strcmp(e->key, key))
+ return e->value;
+ return NULL;
+}
+
+/**
+ * qdict_add(): Add a new object into the dictionary
+ *
+ * Add the pair 'key:value' into qdict. Does nothing if 'key' already
+ * exist.
+ *
+ * NOTE: this function 'steals' a reference to 'value'
+ */
+void qdict_add(QDict *qdict, const char *key, QObject *value)
+{
+ unsigned int hash;
+ QDictEntry *entry;
+
+ hash = tdb_hash(key) % QDICT_HASH_SIZE;
+ if (qdict_find(qdict, key, hash)) {
+ /* Don't add again if it's already there */
+ return;
+ }
+
+ entry = alloc_entry(key, value, qdict->table[hash]);
+ qdict->table[hash] = entry;
+ qdict->size++;
+}
+
+/**
+ * qdict_add_qint(): Add a new QInt into the dictionary
+ *
+ * Add the pair 'key:qint' into qdict. Does nothing if 'key' already
+ * exist.
+ *
+ * NOTE: this function 'steals' a reference to 'qi'
+ */
+void qdict_add_qint(QDict *qdict, const char *key, QInt *qi)
+{
+ qdict_add(qdict, key, QOBJECT(qi));
+}
+
+/**
+ * qdict_add_qstring(): Add a new QString into the dictionary
+ *
+ * Add the pair 'key:qstring' into qdict. Does nothing if 'key' already
+ * exist.
+ *
+ * NOTE: this function 'steals' a reference to 'qs'
+ */
+void qdict_add_qstring(QDict *qdict, const char *key, QString *qs)
+{
+ qdict_add(qdict, key, QOBJECT(qs));
+}
+
+/**
+ * qdict_get(): Lookup for a given 'key'
+ *
+ * Return borrowed reference to QObject if 'key' exists,
+ * NULL otherwise.
+ */
+QObject *qdict_get(const QDict *qdict, const char *key)
+{
+ return qdict_find(qdict, key, tdb_hash(key) % QDICT_HASH_SIZE);
+}
+
+/**
+ * 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 int value mapped by 'key'
+ *
+ * This function assumes that 'key' exists and it stores a
+ * QInt object.
+ */
+int qdict_get_int(const QDict *qdict, const char *key)
+{
+ QObject *obj = qdict_get_obj(qdict, key, QTYPE_QINT);
+ return qint_to_int(qobject_to_qint(obj));
+}
+
+/**
+ * qdict_get_uint32(): Get an uint32_t value mapped by 'key'
+ *
+ * This function assumes that 'key' exists and it stores a
+ * QInt object.
+ */
+uint32_t qdict_get_uint32(const QDict *qdict, const char *key)
+{
+ QObject *obj = qdict_get_obj(qdict, key, QTYPE_QINT);
+ return qint_to_uint32(qobject_to_qint(obj));
+}
+
+/**
+ * qdict_get_uint64(): Get an uint64_t value mapped by 'key'
+ *
+ * This function assumes that 'key' exists and it stores a
+ * QInt object.
+ */
+uint64_t qdict_get_uint64(const QDict *qdict, const char *key)
+{
+ QObject *obj = qdict_get_obj(qdict, key, QTYPE_QINT);
+ return qint_to_uint64(qobject_to_qint(obj));
+}
+
+/**
+ * qdict_get_str(): Get a pointer to the stored string mapped
+ * by 'key'
+ *
+ * return the string pointer on success, NULL if 'key' doesn't
+ * exist.
+ */
+const char *qdict_get_str(const QDict *qdict, const char *key)
+{
+ QObject *obj;
+
+ obj = qdict_get(qdict, key);
+ if (!obj)
+ return NULL;
+
+ assert(qobject_type(obj) == QTYPE_QSTRING);
+ return qstring_get_str(qobject_to_qstring(obj));
+}
+
+/**
+ * qdict_exists(): Check if 'key' exists
+ *
+ * return 1 if 'key' exists in the dict, 0 otherwise
+ */
+int qdict_exists(const QDict *qdict, const char *key)
+{
+ QDictEntry *e;
+
+ for (e = qdict->table[tdb_hash(key) % QDICT_HASH_SIZE]; e; e = e->next)
+ if (!strcmp(e->key, key))
+ return 1;
+ return 0;
+}
+
+/**
+ * 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)
+{
+ unsigned int hash;
+ QDictEntry *e, *prev;
+
+ prev = NULL;
+ hash = tdb_hash(key) % QDICT_HASH_SIZE;
+ for (e = qdict->table[hash]; e; e = e->next) {
+ if (!strcmp(e->key, key)) {
+ if (!prev)
+ qdict->table[hash] = e->next;
+ else
+ prev->next = e->next;
+ qentry_destroy(e);
+ qdict->size--;
+ return;
+ }
+ prev = e;
+ }
+}
+
+/**
+ * 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 *e = qdict->table[i];
+ while (e) {
+ QDictEntry *tmp = e->next;
+ qentry_destroy(e);
+ e = tmp;
+ }
+ }
+
+ qemu_free(qdict);
+}
+
+static QType qdict_type = {
+ .code = QTYPE_QDICT,
+ .destroy = qdict_destroy_obj,
+};
diff --git a/qdict.h b/qdict.h
new file mode 100644
index 0000000..1500b8c
--- /dev/null
+++ b/qdict.h
@@ -0,0 +1,47 @@
+#ifndef QDICT_H
+#define QDICT_H
+
+#include "qint.h"
+#include "qstring.h"
+#include "qobject.h"
+#include <stddef.h>
+
+#define QDICT_HASH_SIZE 512
+
+typedef struct QDictEntry {
+ char *key;
+ QObject *value;
+ struct QDictEntry *next;
+} QDictEntry;
+
+typedef struct QDict {
+ QObject base;
+ size_t size;
+ QDictEntry *table[QDICT_HASH_SIZE];
+} QDict;
+
+/* Object API */
+QDict *qdict_new(void);
+size_t qdict_size(const QDict *qdict);
+void qdict_add(QDict *qdict, const char *key, QObject *value);
+void qdict_del(QDict *qdict, const char *key);
+int qdict_exists(const QDict *qdict, const char *key);
+QObject *qdict_get(const QDict *qdict, const char *key);
+
+/* High level helpers */
+int qdict_get_int(const QDict *qdict, const char *key);
+uint32_t qdict_get_uint32(const QDict *qdict, const char *key);
+uint64_t qdict_get_uint64(const QDict *qdict, const char *key);
+const char *qdict_get_str(const QDict *qdict, const char *key);
+void qdict_add_qint(QDict *qdict, const char *key, QInt *qi);
+void qdict_add_qstring(QDict *qdict, const char *key, QString *qs);
+
+/**
+ * qobject_to_qdict(): Convert a QObject into a QDict
+ */
+static inline QDict *qobject_to_qdict(const QObject *obj)
+{
+ return container_of(obj, QDict, base);
+}
+
+#endif /* QDICT_H */
diff --git a/qobject.h b/qobject.h
index c1bdae7..52df5ff 100644
--- a/qobject.h
+++ b/qobject.h
@@ -42,6 +42,7 @@ typedef enum {
QTYPE_NONE,
QTYPE_QINT,
QTYPE_QSTRING,
+ QTYPE_QDICT,
} qtype_code;
struct QObject;
--
1.6.4.67.gea5b1
- [Qemu-devel] [PATCH v0 00/29] QMonitor, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 03/29] Introduce QString, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 04/29] Introduce QDict,
Luiz Capitulino <=
- [Qemu-devel] [PATCH 05/29] Add wrappers to functions used by the Monitor, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 06/29] monitor: New format for handlers argument types, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 07/29] monitor: Setup a QDict with arguments to handlers, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 09/29] monitor: Port handler_0 to use QDict, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 08/29] monitor: Export QDict header, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 11/29] monitor: Port handler_2 to use QDict, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 10/29] monitor: Port handler_1 to use QDict, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 13/29] monitor: Port handler_4 to use QDict, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 12/29] monitor: Port handler_3 to use QDict, Luiz Capitulino, 2009/08/13
- [Qemu-devel] [PATCH 14/29] monitor: Port handler_5 to use QDict, Luiz Capitulino, 2009/08/13