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cJSON.h
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1 /*
2  Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
3 
4  Permission is hereby granted, free of charge, to any person obtaining a copy
5  of this software and associated documentation files (the "Software"), to deal
6  in the Software without restriction, including without limitation the rights
7  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  copies of the Software, and to permit persons to whom the Software is
9  furnished to do so, subject to the following conditions:
10 
11  The above copyright notice and this permission notice shall be included in
12  all copies or substantial portions of the Software.
13 
14  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20  THE SOFTWARE.
21 */
22 
23 #ifndef cJSON__h
24 #define cJSON__h
25 
26 #ifdef __cplusplus
27 extern "C"
28 {
29 #endif
30 
31 #if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
32 #define __WINDOWS__
33 #endif
34 
35 #ifdef __WINDOWS__
36 
37 /* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention. For windows you have 3 define options:
38 
39 CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
40 CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
41 CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
42 
43 For *nix builds that support visibility attribute, you can define similar behavior by
44 
45 setting default visibility to hidden by adding
46 -fvisibility=hidden (for gcc)
47 or
48 -xldscope=hidden (for sun cc)
49 to CFLAGS
50 
51 then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
52 
53 */
54 
55 #define CJSON_CDECL __cdecl
56 #define CJSON_STDCALL __stdcall
57 
58 /* export symbols by default, this is necessary for copy pasting the C and header file */
59 #if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
60 #define CJSON_EXPORT_SYMBOLS
61 #endif
62 
63 #if defined(CJSON_HIDE_SYMBOLS)
64 #define CJSON_PUBLIC(type) type CJSON_STDCALL
65 #elif defined(CJSON_EXPORT_SYMBOLS)
66 #define CJSON_PUBLIC(type) __declspec(dllexport) type CJSON_STDCALL
67 #elif defined(CJSON_IMPORT_SYMBOLS)
68 #define CJSON_PUBLIC(type) __declspec(dllimport) type CJSON_STDCALL
69 #endif
70 #else /* !__WINDOWS__ */
71 #define CJSON_CDECL
72 #define CJSON_STDCALL
73 
74 #if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
75 #define CJSON_PUBLIC(type) __attribute__((visibility("default"))) type
76 #else
77 #define CJSON_PUBLIC(type) type
78 #endif
79 #endif
80 
81 /* project version */
82 #define CJSON_VERSION_MAJOR 1
83 #define CJSON_VERSION_MINOR 7
84 #define CJSON_VERSION_PATCH 14
85 
86 #include <stddef.h>
87 
88 /* cJSON Types: */
89 #define cJSON_Invalid (0)
90 #define cJSON_False (1 << 0)
91 #define cJSON_True (1 << 1)
92 #define cJSON_NULL (1 << 2)
93 #define cJSON_Number (1 << 3)
94 #define cJSON_String (1 << 4)
95 #define cJSON_Array (1 << 5)
96 #define cJSON_Object (1 << 6)
97 #define cJSON_Raw (1 << 7) /* raw json */
98 
99 #define cJSON_IsReference 256
100 #define cJSON_StringIsConst 512
101 
102 /* The cJSON structure: */
103 typedef struct cJSON
104 {
105  /* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
106  struct cJSON *next;
107  struct cJSON *prev;
108  /* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
109  struct cJSON *child;
110 
111  /* The type of the item, as above. */
112  int type;
113 
114  /* The item's string, if type==cJSON_String and type == cJSON_Raw */
115  char *valuestring;
116  /* writing to valueint is DEPRECATED, use cJSON_SetNumberValue instead */
117  int valueint;
118  /* The item's number, if type==cJSON_Number */
119  double valuedouble;
120 
121  /* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
122  char *string;
123 } cJSON;
124 
125 typedef struct cJSON_Hooks
126 {
127  /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
128  void *(CJSON_CDECL *malloc_fn)(size_t sz);
129  void (CJSON_CDECL *free_fn)(void *ptr);
130 } cJSON_Hooks;
131 
132 typedef int cJSON_bool;
133 
134 /* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
135  * This is to prevent stack overflows. */
136 #ifndef CJSON_NESTING_LIMIT
137 #define CJSON_NESTING_LIMIT 1000
138 #endif
139 
140 /* returns the version of cJSON as a string */
141 CJSON_PUBLIC(const char*) cJSON_Version(void);
142 
143 /* Supply malloc, realloc and free functions to cJSON */
144 CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks);
145 
146 /* Memory Management: the caller is always responsible to free the results from all variants of cJSON_Parse (with cJSON_Delete) and cJSON_Print (with stdlib free, cJSON_Hooks.free_fn, or cJSON_free as appropriate). The exception is cJSON_PrintPreallocated, where the caller has full responsibility of the buffer. */
147 /* Supply a block of JSON, and this returns a cJSON object you can interrogate. */
148 CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value);
149 CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length);
150 /* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
151 /* If you supply a ptr in return_parse_end and parsing fails, then return_parse_end will contain a pointer to the error so will match cJSON_GetErrorPtr(). */
152 CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated);
153 CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated);
154 
155 /* Render a cJSON entity to text for transfer/storage. */
156 CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item);
157 /* Render a cJSON entity to text for transfer/storage without any formatting. */
158 CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item);
159 /* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
160 CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt);
161 /* Render a cJSON entity to text using a buffer already allocated in memory with given length. Returns 1 on success and 0 on failure. */
162 /* NOTE: cJSON is not always 100% accurate in estimating how much memory it will use, so to be safe allocate 5 bytes more than you actually need */
163 CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format);
164 /* Delete a cJSON entity and all subentities. */
165 CJSON_PUBLIC(void) cJSON_Delete(cJSON *item);
166 
167 /* Returns the number of items in an array (or object). */
168 CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
169 /* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
170 CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
171 /* Get item "string" from object. Case insensitive. */
172 CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
173 CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON * const object, const char * const string);
174 CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
175 /* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
176 CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void);
177 
178 /* Check item type and return its value */
179 CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON * const item);
180 CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item);
181 
182 /* These functions check the type of an item */
183 CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON * const item);
184 CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON * const item);
185 CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON * const item);
186 CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON * const item);
187 CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON * const item);
188 CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON * const item);
189 CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON * const item);
190 CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON * const item);
191 CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON * const item);
192 CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item);
193 
194 /* These calls create a cJSON item of the appropriate type. */
195 CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void);
196 CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void);
197 CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void);
198 CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean);
199 CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num);
200 CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string);
201 /* raw json */
202 CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw);
203 CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void);
204 CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void);
205 
206 /* Create a string where valuestring references a string so
207  * it will not be freed by cJSON_Delete */
208 CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string);
209 /* Create an object/array that only references it's elements so
210  * they will not be freed by cJSON_Delete */
211 CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child);
212 CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child);
213 
214 /* These utilities create an Array of count items.
215  * The parameter count cannot be greater than the number of elements in the number array, otherwise array access will be out of bounds.*/
216 CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count);
217 CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count);
218 CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count);
219 CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count);
220 
221 /* Append item to the specified array/object. */
222 CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item);
223 CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
224 /* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object.
225  * WARNING: When this function was used, make sure to always check that (item->type & cJSON_StringIsConst) is zero before
226  * writing to `item->string` */
227 CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item);
228 /* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
229 CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
230 CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
231 
232 /* Remove/Detach items from Arrays/Objects. */
233 CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item);
234 CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
235 CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
236 CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);
237 CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string);
238 CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string);
239 CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string);
240 
241 /* Update array items. */
242 CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem); /* Shifts pre-existing items to the right. */
243 CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement);
244 CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
245 CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);
246 CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object,const char *string,cJSON *newitem);
247 
248 /* Duplicate a cJSON item */
249 CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse);
250 /* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
251  * need to be released. With recurse!=0, it will duplicate any children connected to the item.
252  * The item->next and ->prev pointers are always zero on return from Duplicate. */
253 /* Recursively compare two cJSON items for equality. If either a or b is NULL or invalid, they will be considered unequal.
254  * case_sensitive determines if object keys are treated case sensitive (1) or case insensitive (0) */
255 CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive);
256 
257 /* Minify a strings, remove blank characters(such as ' ', '\t', '\r', '\n') from strings.
258  * The input pointer json cannot point to a read-only address area, such as a string constant,
259  * but should point to a readable and writable adress area. */
260 CJSON_PUBLIC(void) cJSON_Minify(char *json);
261 
262 /* Helper functions for creating and adding items to an object at the same time.
263  * They return the added item or NULL on failure. */
264 CJSON_PUBLIC(cJSON*) cJSON_AddNullToObject(cJSON * const object, const char * const name);
265 CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * const name);
266 CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name);
267 CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean);
268 CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number);
269 CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string);
270 CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw);
271 CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name);
272 CJSON_PUBLIC(cJSON*) cJSON_AddArrayToObject(cJSON * const object, const char * const name);
273 
274 /* When assigning an integer value, it needs to be propagated to valuedouble too. */
275 #define cJSON_SetIntValue(object, number) ((object) ? (object)->valueint = (object)->valuedouble = (number) : (number))
276 /* helper for the cJSON_SetNumberValue macro */
277 CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
278 #define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
279 /* Change the valuestring of a cJSON_String object, only takes effect when type of object is cJSON_String */
280 CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring);
281 
282 /* Macro for iterating over an array or object */
283 #define cJSON_ArrayForEach(element, array) for(element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
284 
285 /* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
286 CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
287 CJSON_PUBLIC(void) cJSON_free(void *object);
288 
289 #ifdef __cplusplus
290 }
291 #endif
292 
293 #endif
name
const char *const name
Definition: cJSON.h:264
raw
const char *const const char *const raw
Definition: cJSON.h:270
buffer
char * buffer
Definition: cJSON.h:163
cJSON
Definition: cJSON.h:103
return_parse_end
const char ** return_parse_end
Definition: cJSON.h:152
cJSON::next
struct cJSON * next
Definition: cJSON.h:106
cJSON::valueint
int valueint
Definition: cJSON.h:117
cJSON_Hooks::void
void(CJSON_CDECL *free_fn)(void *ptr)
case_sensitive
const cJSON *const const cJSON_bool case_sensitive
Definition: cJSON.h:255
cJSON_Hooks
struct cJSON_Hooks cJSON_Hooks
number
const char *const const double number
Definition: cJSON.h:268
format
char const int const cJSON_bool format
Definition: cJSON.h:163
which
int which
Definition: cJSON.h:234
cJSON::valuestring
char * valuestring
Definition: cJSON.h:115
cJSON_Hooks::malloc_fn
void *CJSON_CDECL * malloc_fn(size_t sz)
replacement
cJSON *const cJSON * replacement
Definition: cJSON.h:243
CJSON_CDECL
#define CJSON_CDECL
Definition: cJSON.h:71
b
const cJSON *const b
Definition: cJSON.h:255
cJSON_bool
int cJSON_bool
Definition: cJSON.h:132
fmt
int cJSON_bool fmt
Definition: cJSON.h:160
prebuffer
int prebuffer
Definition: cJSON.h:160
size
u32 size
Definition: vhost_user.h:125
buffer_length
size_t buffer_length
Definition: cJSON.h:149
valuestring
const char * valuestring
Definition: cJSON.h:280
cJSON_Hooks
Definition: cJSON.h:125
cJSON::string
char * string
Definition: cJSON.h:122
value
u8 value
Definition: qos.api:54
cJSON::prev
struct cJSON * prev
Definition: cJSON.h:107
length
char const int length
Definition: cJSON.h:163
item
cJSON * item
Definition: cJSON.h:222
a
a
Definition: bitmap.h:544
cJSON
struct cJSON cJSON
cJSON::child
struct cJSON * child
Definition: cJSON.h:109
index
int index
Definition: cJSON.h:170
CJSON_PUBLIC
#define CJSON_PUBLIC(type)
Definition: cJSON.h:77
count
int count
Definition: cJSON.h:216
require_null_terminated
const char cJSON_bool require_null_terminated
Definition: cJSON.h:152
recurse
cJSON_bool recurse
Definition: cJSON.h:249
cJSON::valuedouble
double valuedouble
Definition: cJSON.h:119
cJSON::type
int type
Definition: cJSON.h:112
newitem
int cJSON * newitem
Definition: cJSON.h:242