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14#include "qemu/osdep.h"
15#include "qapi/error.h"
16#include "qapi/qmp/json-parser.h"
17#include "qapi/qmp/qjson.h"
18#include "qapi/qmp/qbool.h"
19#include "qapi/qmp/qdict.h"
20#include "qapi/qmp/qlist.h"
21#include "qapi/qmp/qnum.h"
22#include "qapi/qmp/qstring.h"
23#include "qemu/unicode.h"
24
25typedef struct JSONParsingState
26{
27 JSONMessageParser parser;
28 QObject *result;
29 Error *err;
30} JSONParsingState;
31
32static void consume_json(void *opaque, QObject *json, Error *err)
33{
34 JSONParsingState *s = opaque;
35
36 assert(!json != !err);
37 assert(!s->result || !s->err);
38
39 if (s->result) {
40 qobject_unref(s->result);
41 s->result = NULL;
42 error_setg(&s->err, "Expecting at most one JSON value");
43 }
44 if (s->err) {
45 qobject_unref(json);
46 error_free(err);
47 return;
48 }
49 s->result = json;
50 s->err = err;
51}
52
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61
62
63static QObject *qobject_from_jsonv(const char *string, va_list *ap,
64 Error **errp)
65{
66 JSONParsingState state = {};
67
68 json_message_parser_init(&state.parser, consume_json, &state, ap);
69 json_message_parser_feed(&state.parser, string, strlen(string));
70 json_message_parser_flush(&state.parser);
71 json_message_parser_destroy(&state.parser);
72
73 if (!state.result && !state.err) {
74 error_setg(&state.err, "Expecting a JSON value");
75 }
76
77 error_propagate(errp, state.err);
78 return state.result;
79}
80
81QObject *qobject_from_json(const char *string, Error **errp)
82{
83 return qobject_from_jsonv(string, NULL, errp);
84}
85
86
87
88
89
90
91QObject *qobject_from_vjsonf_nofail(const char *string, va_list ap)
92{
93 va_list ap_copy;
94 QObject *obj;
95
96
97 va_copy(ap_copy, ap);
98 obj = qobject_from_jsonv(string, &ap_copy, &error_abort);
99 va_end(ap_copy);
100
101 assert(obj);
102 return obj;
103}
104
105
106
107
108
109
110QObject *qobject_from_jsonf_nofail(const char *string, ...)
111{
112 QObject *obj;
113 va_list ap;
114
115 va_start(ap, string);
116 obj = qobject_from_vjsonf_nofail(string, ap);
117 va_end(ap);
118
119 return obj;
120}
121
122
123
124
125
126
127QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap)
128{
129 QDict *qdict;
130
131 qdict = qobject_to(QDict, qobject_from_vjsonf_nofail(string, ap));
132 assert(qdict);
133 return qdict;
134}
135
136
137
138
139
140
141QDict *qdict_from_jsonf_nofail(const char *string, ...)
142{
143 QDict *qdict;
144 va_list ap;
145
146 va_start(ap, string);
147 qdict = qdict_from_vjsonf_nofail(string, ap);
148 va_end(ap);
149 return qdict;
150}
151
152static void to_json(const QObject *obj, QString *str, int pretty, int indent);
153
154static void json_pretty_newline(QString *str, bool pretty, int indent)
155{
156 int i;
157
158 if (pretty) {
159 qstring_append(str, "\n");
160 for (i = 0; i < indent; i++) {
161 qstring_append(str, " ");
162 }
163 }
164}
165
166static void to_json(const QObject *obj, QString *str, int pretty, int indent)
167{
168 switch (qobject_type(obj)) {
169 case QTYPE_QNULL:
170 qstring_append(str, "null");
171 break;
172 case QTYPE_QNUM: {
173 QNum *val = qobject_to(QNum, obj);
174 char *buffer = qnum_to_string(val);
175 qstring_append(str, buffer);
176 g_free(buffer);
177 break;
178 }
179 case QTYPE_QSTRING: {
180 QString *val = qobject_to(QString, obj);
181 const char *ptr;
182 int cp;
183 char buf[16];
184 char *end;
185
186 ptr = qstring_get_str(val);
187 qstring_append(str, "\"");
188
189 for (; *ptr; ptr = end) {
190 cp = mod_utf8_codepoint(ptr, 6, &end);
191 switch (cp) {
192 case '\"':
193 qstring_append(str, "\\\"");
194 break;
195 case '\\':
196 qstring_append(str, "\\\\");
197 break;
198 case '\b':
199 qstring_append(str, "\\b");
200 break;
201 case '\f':
202 qstring_append(str, "\\f");
203 break;
204 case '\n':
205 qstring_append(str, "\\n");
206 break;
207 case '\r':
208 qstring_append(str, "\\r");
209 break;
210 case '\t':
211 qstring_append(str, "\\t");
212 break;
213 default:
214 if (cp < 0) {
215 cp = 0xFFFD;
216 }
217 if (cp > 0xFFFF) {
218
219 snprintf(buf, sizeof(buf), "\\u%04X\\u%04X",
220 0xD800 + ((cp - 0x10000) >> 10),
221 0xDC00 + ((cp - 0x10000) & 0x3FF));
222 } else if (cp < 0x20 || cp >= 0x7F) {
223 snprintf(buf, sizeof(buf), "\\u%04X", cp);
224 } else {
225 buf[0] = cp;
226 buf[1] = 0;
227 }
228 qstring_append(str, buf);
229 }
230 };
231
232 qstring_append(str, "\"");
233 break;
234 }
235 case QTYPE_QDICT: {
236 QDict *val = qobject_to(QDict, obj);
237 const char *comma = pretty ? "," : ", ";
238 const char *sep = "";
239 const QDictEntry *entry;
240 QString *qkey;
241
242 qstring_append(str, "{");
243
244 for (entry = qdict_first(val);
245 entry;
246 entry = qdict_next(val, entry)) {
247 qstring_append(str, sep);
248 json_pretty_newline(str, pretty, indent + 1);
249
250 qkey = qstring_from_str(qdict_entry_key(entry));
251 to_json(QOBJECT(qkey), str, pretty, indent + 1);
252 qobject_unref(qkey);
253
254 qstring_append(str, ": ");
255 to_json(qdict_entry_value(entry), str, pretty, indent + 1);
256 sep = comma;
257 }
258
259 json_pretty_newline(str, pretty, indent);
260 qstring_append(str, "}");
261 break;
262 }
263 case QTYPE_QLIST: {
264 QList *val = qobject_to(QList, obj);
265 const char *comma = pretty ? "," : ", ";
266 const char *sep = "";
267 QListEntry *entry;
268
269 qstring_append(str, "[");
270
271 QLIST_FOREACH_ENTRY(val, entry) {
272 qstring_append(str, sep);
273 json_pretty_newline(str, pretty, indent + 1);
274 to_json(qlist_entry_obj(entry), str, pretty, indent + 1);
275 sep = comma;
276 }
277
278 json_pretty_newline(str, pretty, indent);
279 qstring_append(str, "]");
280 break;
281 }
282 case QTYPE_QBOOL: {
283 QBool *val = qobject_to(QBool, obj);
284
285 if (qbool_get_bool(val)) {
286 qstring_append(str, "true");
287 } else {
288 qstring_append(str, "false");
289 }
290 break;
291 }
292 default:
293 abort();
294 }
295}
296
297QString *qobject_to_json(const QObject *obj)
298{
299 QString *str = qstring_new();
300
301 to_json(obj, str, 0, 0);
302
303 return str;
304}
305
306QString *qobject_to_json_pretty(const QObject *obj)
307{
308 QString *str = qstring_new();
309
310 to_json(obj, str, 1, 0);
311
312 return str;
313}
314