1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* QObject JSON integration
*
* Copyright IBM, Corp. 2009
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.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/error.h"
#include "qapi/qmp/json-parser.h"
#include "qapi/qmp/json-writer.h"
#include "qapi/qmp/qjson.h"
#include "qapi/qmp/qbool.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/qnum.h"
#include "qapi/qmp/qstring.h"
typedef struct JSONParsingState
{
JSONMessageParser parser;
QObject *result;
Error *err;
} JSONParsingState;
static void consume_json(void *opaque, QObject *json, Error *err)
{
JSONParsingState *s = opaque;
assert(!json != !err);
assert(!s->result || !s->err);
if (s->result) {
qobject_unref(s->result);
s->result = NULL;
error_setg(&s->err, "Expecting at most one JSON value");
}
if (s->err) {
qobject_unref(json);
error_free(err);
return;
}
s->result = json;
s->err = err;
}
/*
* Parse @string as JSON value.
* If @ap is non-null, interpolate %-escapes.
* Takes ownership of %p arguments.
* On success, return the JSON value.
* On failure, store an error through @errp and return NULL.
* Ownership of %p arguments becomes indeterminate then. To avoid
* leaks, callers passing %p must terminate on error, e.g. by passing
* &error_abort.
*/
static QObject *qobject_from_jsonv(const char *string, va_list *ap,
Error **errp)
{
JSONParsingState state = {};
json_message_parser_init(&state.parser, consume_json, &state, ap);
json_message_parser_feed(&state.parser, string, strlen(string));
json_message_parser_flush(&state.parser);
json_message_parser_destroy(&state.parser);
if (!state.result && !state.err) {
error_setg(&state.err, "Expecting a JSON value");
}
error_propagate(errp, state.err);
return state.result;
}
QObject *qobject_from_json(const char *string, Error **errp)
{
return qobject_from_jsonv(string, NULL, errp);
}
/*
* Parse @string as JSON value with %-escapes interpolated.
* Abort on error. Do not use with untrusted @string.
* Return the resulting QObject. It is never null.
*/
QObject *qobject_from_vjsonf_nofail(const char *string, va_list ap)
{
va_list ap_copy;
QObject *obj;
/* va_copy() is needed when va_list is an array type */
va_copy(ap_copy, ap);
obj = qobject_from_jsonv(string, &ap_copy, &error_abort);
va_end(ap_copy);
assert(obj);
return obj;
}
/*
* Parse @string as JSON value with %-escapes interpolated.
* Abort on error. Do not use with untrusted @string.
* Return the resulting QObject. It is never null.
*/
QObject *qobject_from_jsonf_nofail(const char *string, ...)
{
QObject *obj;
va_list ap;
va_start(ap, string);
obj = qobject_from_vjsonf_nofail(string, ap);
va_end(ap);
return obj;
}
/*
* Parse @string as JSON object with %-escapes interpolated.
* Abort on error. Do not use with untrusted @string.
* Return the resulting QDict. It is never null.
*/
QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap)
{
QDict *qdict;
qdict = qobject_to(QDict, qobject_from_vjsonf_nofail(string, ap));
assert(qdict);
return qdict;
}
/*
* Parse @string as JSON object with %-escapes interpolated.
* Abort on error. Do not use with untrusted @string.
* Return the resulting QDict. It is never null.
*/
QDict *qdict_from_jsonf_nofail(const char *string, ...)
{
QDict *qdict;
va_list ap;
va_start(ap, string);
qdict = qdict_from_vjsonf_nofail(string, ap);
va_end(ap);
return qdict;
}
static void to_json(JSONWriter *writer, const char *name,
const QObject *obj)
{
switch (qobject_type(obj)) {
case QTYPE_QNULL:
json_writer_null(writer, name);
break;
case QTYPE_QNUM: {
QNum *val = qobject_to(QNum, obj);
switch (val->kind) {
case QNUM_I64:
json_writer_int64(writer, name, val->u.i64);
break;
case QNUM_U64:
json_writer_uint64(writer, name, val->u.u64);
break;
case QNUM_DOUBLE:
json_writer_double(writer, name, val->u.dbl);
break;
default:
abort();
}
break;
}
case QTYPE_QSTRING: {
QString *val = qobject_to(QString, obj);
json_writer_str(writer, name, qstring_get_str(val));
break;
}
case QTYPE_QDICT: {
QDict *val = qobject_to(QDict, obj);
const QDictEntry *entry;
json_writer_start_object(writer, name);
for (entry = qdict_first(val);
entry;
entry = qdict_next(val, entry)) {
to_json(writer, qdict_entry_key(entry), qdict_entry_value(entry));
}
json_writer_end_object(writer);
break;
}
case QTYPE_QLIST: {
QList *val = qobject_to(QList, obj);
QListEntry *entry;
json_writer_start_array(writer, name);
QLIST_FOREACH_ENTRY(val, entry) {
to_json(writer, NULL, qlist_entry_obj(entry));
}
json_writer_end_array(writer);
break;
}
case QTYPE_QBOOL: {
QBool *val = qobject_to(QBool, obj);
json_writer_bool(writer, name, qbool_get_bool(val));
break;
}
default:
abort();
}
}
GString *qobject_to_json_pretty(const QObject *obj, bool pretty)
{
JSONWriter *writer = json_writer_new(pretty);
to_json(writer, NULL, obj);
return json_writer_get_and_free(writer);
}
GString *qobject_to_json(const QObject *obj)
{
return qobject_to_json_pretty(obj, false);
}
|
