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Sources/libubox/blobmsg_json.c

  1 /*
  2  * Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org>
  3  *
  4  * Permission to use, copy, modify, and/or distribute this software for any
  5  * purpose with or without fee is hereby granted, provided that the above
  6  * copyright notice and this permission notice appear in all copies.
  7  *
  8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15  */
 16 #include <inttypes.h>
 17 #include "blobmsg.h"
 18 #include "blobmsg_json.h"
 19 
 20 #ifdef JSONC
 21         #include <json.h>
 22 #else
 23         #include <json/json.h>
 24 #endif
 25 
 26 bool blobmsg_add_object(struct blob_buf *b, json_object *obj)
 27 {
 28         json_object_object_foreach(obj, key, val) {
 29                 if (!blobmsg_add_json_element(b, key, val))
 30                         return false;
 31         }
 32         return true;
 33 }
 34 
 35 static bool blobmsg_add_array(struct blob_buf *b, struct array_list *a)
 36 {
 37         int i, len;
 38 
 39         for (i = 0, len = array_list_length(a); i < len; i++) {
 40                 if (!blobmsg_add_json_element(b, NULL, array_list_get_idx(a, i)))
 41                         return false;
 42         }
 43 
 44         return true;
 45 }
 46 
 47 bool blobmsg_add_json_element(struct blob_buf *b, const char *name, json_object *obj)
 48 {
 49         bool ret = true;
 50         void *c;
 51 
 52         switch (json_object_get_type(obj)) {
 53         case json_type_object:
 54                 c = blobmsg_open_table(b, name);
 55                 ret = blobmsg_add_object(b, obj);
 56                 blobmsg_close_table(b, c);
 57                 break;
 58         case json_type_array:
 59                 c = blobmsg_open_array(b, name);
 60                 ret = blobmsg_add_array(b, json_object_get_array(obj));
 61                 blobmsg_close_array(b, c);
 62                 break;
 63         case json_type_string:
 64                 blobmsg_add_string(b, name, json_object_get_string(obj));
 65                 break;
 66         case json_type_boolean:
 67                 blobmsg_add_u8(b, name, json_object_get_boolean(obj));
 68                 break;
 69         case json_type_int: {
 70                 int64_t i64 = json_object_get_int64(obj);
 71                 if (i64 >= INT32_MIN && i64 <= INT32_MAX) {
 72                         blobmsg_add_u32(b, name, (uint32_t)i64);
 73                 } else {
 74                         blobmsg_add_u64(b, name, (uint64_t)i64);
 75                 }
 76                 break;
 77         }
 78         case json_type_double:
 79                 blobmsg_add_double(b, name, json_object_get_double(obj));
 80                 break;
 81         case json_type_null:
 82                 blobmsg_add_field(b, BLOBMSG_TYPE_UNSPEC, name, NULL, 0);
 83                 break;
 84         default:
 85                 return false;
 86         }
 87         return ret;
 88 }
 89 
 90 static bool __blobmsg_add_json(struct blob_buf *b, json_object *obj)
 91 {
 92         bool ret = false;
 93 
 94         if (!obj)
 95                 return false;
 96 
 97         if (json_object_get_type(obj) != json_type_object)
 98                 goto out;
 99 
100         ret = blobmsg_add_object(b, obj);
101 
102 out:
103         json_object_put(obj);
104         return ret;
105 }
106 
107 bool blobmsg_add_json_from_file(struct blob_buf *b, const char *file)
108 {
109         return __blobmsg_add_json(b, json_object_from_file(file));
110 }
111 
112 bool blobmsg_add_json_from_string(struct blob_buf *b, const char *str)
113 {
114         return __blobmsg_add_json(b, json_tokener_parse(str));
115 }
116 
117 
118 struct strbuf {
119         int len;
120         int pos;
121         char *buf;
122 
123         blobmsg_json_format_t custom_format;
124         void *priv;
125         bool indent;
126         int indent_level;
127 };
128 
129 static bool blobmsg_puts(struct strbuf *s, const char *c, int len)
130 {
131         size_t new_len;
132         char *new_buf;
133 
134         if (len <= 0)
135                 return true;
136 
137         if (s->pos + len >= s->len) {
138                 new_len = s->len + 16 + len;
139                 new_buf = realloc(s->buf, new_len);
140                 if (!new_buf)
141                         return false;
142 
143                 s->len = new_len;
144                 s->buf = new_buf;
145         }
146 
147         memcpy(s->buf + s->pos, c, len);
148         s->pos += len;
149         return true;
150 }
151 
152 static void add_separator(struct strbuf *s)
153 {
154         const char *indent_chars = "\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
155         size_t len;
156 
157         if (!s->indent)
158                 return;
159 
160         len = s->indent_level + 1;
161         if (len > strlen(indent_chars))
162                 len = strlen(indent_chars);
163 
164         blobmsg_puts(s, indent_chars, len);
165 }
166 
167 
168 static void blobmsg_format_string(struct strbuf *s, const char *str)
169 {
170         const unsigned char *p, *last, *end;
171         char buf[8] = "\\u00";
172 
173         end = (unsigned char *) str + strlen(str);
174         blobmsg_puts(s, "\"", 1);
175         for (p = (unsigned char *) str, last = p; *p; p++) {
176                 char escape = '\0';
177                 int len;
178 
179                 switch(*p) {
180                 case '\b':
181                         escape = 'b';
182                         break;
183                 case '\n':
184                         escape = 'n';
185                         break;
186                 case '\t':
187                         escape = 't';
188                         break;
189                 case '\r':
190                         escape = 'r';
191                         break;
192                 case '"':
193                 case '\\':
194                         escape = *p;
195                         break;
196                 default:
197                         if (*p < ' ')
198                                 escape = 'u';
199                         break;
200                 }
201 
202                 if (!escape)
203                         continue;
204 
205                 if (p > last)
206                         blobmsg_puts(s, (char *) last, p - last);
207                 last = p + 1;
208                 buf[1] = escape;
209 
210                 if (escape == 'u') {
211                         snprintf(buf + 4, sizeof(buf) - 4, "%02x", (unsigned char) *p);
212                         len = 6;
213                 } else {
214                         len = 2;
215                 }
216                 blobmsg_puts(s, buf, len);
217         }
218 
219         blobmsg_puts(s, (char *) last, end - last);
220         blobmsg_puts(s, "\"", 1);
221 }
222 
223 static void blobmsg_format_json_list(struct strbuf *s, struct blob_attr *attr, int len, bool array);
224 
225 static void blobmsg_format_element(struct strbuf *s, struct blob_attr *attr, bool without_name, bool head)
226 {
227         const char *data_str;
228         char buf[317];
229         void *data;
230         int len;
231 
232         if (!blobmsg_check_attr(attr, false))
233                 return;
234 
235         if (!without_name && blobmsg_name(attr)[0]) {
236                 blobmsg_format_string(s, blobmsg_name(attr));
237                 blobmsg_puts(s, ": ", s->indent ? 2 : 1);
238         }
239 
240         data = blobmsg_data(attr);
241         len = blobmsg_data_len(attr);
242 
243         if (!head && s->custom_format) {
244                 data_str = s->custom_format(s->priv, attr);
245                 if (data_str)
246                         goto out;
247         }
248 
249         data_str = buf;
250         switch(blob_id(attr)) {
251         case BLOBMSG_TYPE_UNSPEC:
252                 snprintf(buf, sizeof(buf), "null");
253                 break;
254         case BLOBMSG_TYPE_BOOL:
255                 snprintf(buf, sizeof(buf), "%s", *(uint8_t *)data ? "true" : "false");
256                 break;
257         case BLOBMSG_TYPE_INT16:
258                 snprintf(buf, sizeof(buf), "%" PRId16, (int16_t) be16_to_cpu(*(uint16_t *)data));
259                 break;
260         case BLOBMSG_TYPE_INT32:
261                 snprintf(buf, sizeof(buf), "%" PRId32, (int32_t) be32_to_cpu(*(uint32_t *)data));
262                 break;
263         case BLOBMSG_TYPE_INT64:
264                 snprintf(buf, sizeof(buf), "%" PRId64, (int64_t) be64_to_cpu(*(uint64_t *)data));
265                 break;
266         case BLOBMSG_TYPE_DOUBLE:
267                 snprintf(buf, sizeof(buf), "%lf", blobmsg_get_double(attr));
268                 break;
269         case BLOBMSG_TYPE_STRING:
270                 blobmsg_format_string(s, data);
271                 return;
272         case BLOBMSG_TYPE_ARRAY:
273                 blobmsg_format_json_list(s, data, len, true);
274                 return;
275         case BLOBMSG_TYPE_TABLE:
276                 blobmsg_format_json_list(s, data, len, false);
277                 return;
278         }
279 
280 out:
281         blobmsg_puts(s, data_str, strlen(data_str));
282 }
283 
284 static void blobmsg_format_json_list(struct strbuf *s, struct blob_attr *attr, int len, bool array)
285 {
286         struct blob_attr *pos;
287         bool first = true;
288         size_t rem = len;
289 
290         blobmsg_puts(s, (array ? "[" : "{" ), 1);
291         s->indent_level++;
292         add_separator(s);
293         __blob_for_each_attr(pos, attr, rem) {
294                 if (!first) {
295                         blobmsg_puts(s, ",", 1);
296                         add_separator(s);
297                 }
298 
299                 blobmsg_format_element(s, pos, array, false);
300                 first = false;
301         }
302         s->indent_level--;
303         add_separator(s);
304         blobmsg_puts(s, (array ? "]" : "}"), 1);
305 }
306 
307 static void setup_strbuf(struct strbuf *s, struct blob_attr *attr, blobmsg_json_format_t cb, void *priv, int indent)
308 {
309         s->len = blob_len(attr);
310         s->buf = malloc(s->len);
311         s->pos = 0;
312         s->custom_format = cb;
313         s->priv = priv;
314         s->indent = false;
315 
316         if (indent >= 0) {
317                 s->indent = true;
318                 s->indent_level = indent;
319         }
320 }
321 
322 char *blobmsg_format_json_with_cb(struct blob_attr *attr, bool list, blobmsg_json_format_t cb, void *priv, int indent)
323 {
324         struct strbuf s = {0};
325         bool array;
326         char *ret;
327 
328         setup_strbuf(&s, attr, cb, priv, indent);
329         if (!s.buf)
330                 return NULL;
331 
332         array = blob_is_extended(attr) &&
333                 blobmsg_type(attr) == BLOBMSG_TYPE_ARRAY;
334 
335         if (list)
336                 blobmsg_format_json_list(&s, blobmsg_data(attr), blobmsg_data_len(attr), array);
337         else
338                 blobmsg_format_element(&s, attr, false, false);
339 
340         if (!s.len) {
341                 free(s.buf);
342                 return NULL;
343         }
344 
345         ret = realloc(s.buf, s.pos + 1);
346         if (!ret) {
347                 free(s.buf);
348                 return NULL;
349         }
350 
351         ret[s.pos] = 0;
352 
353         return ret;
354 }
355 
356 char *blobmsg_format_json_value_with_cb(struct blob_attr *attr, blobmsg_json_format_t cb, void *priv, int indent)
357 {
358         struct strbuf s = {0};
359         char *ret;
360 
361         setup_strbuf(&s, attr, cb, priv, indent);
362         if (!s.buf)
363                 return NULL;
364 
365         blobmsg_format_element(&s, attr, true, false);
366 
367         if (!s.len) {
368                 free(s.buf);
369                 return NULL;
370         }
371 
372         ret = realloc(s.buf, s.pos + 1);
373         if (!ret) {
374                 free(s.buf);
375                 return NULL;
376         }
377 
378         ret[s.pos] = 0;
379 
380         return ret;
381 }
382 

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