libwebsockets
Lightweight C library for HTML5 websockets
Loading...
Searching...
No Matches
lws-lejp.h
Go to the documentation of this file.
1/*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
32struct lejp_ctx;
33
34#if !defined(LWS_ARRAY_SIZE)
35#define LWS_ARRAY_SIZE(_x) (sizeof(_x) / sizeof(_x[0]))
36#endif
37#define LEJP_FLAG_WS_KEEP 64
38#define LEJP_FLAG_WS_COMMENTLINE 32
39
58
84
85#define LEJP_FLAG_CB_IS_VALUE 64
86
114
176LWS_EXTERN signed char _lejp_callback(struct lejp_ctx *ctx, char reason);
177
178typedef signed char (*lejp_callback)(struct lejp_ctx *ctx, char reason);
179
180#ifndef LEJP_MAX_PARSING_STACK_DEPTH
181#define LEJP_MAX_PARSING_STACK_DEPTH 8
182#endif
183#ifndef LEJP_MAX_DEPTH
184#define LEJP_MAX_DEPTH 16
185#endif
186#ifndef LEJP_MAX_INDEX_DEPTH
187#define LEJP_MAX_INDEX_DEPTH 12
188#endif
189#ifndef LEJP_MAX_PATH
190#define LEJP_MAX_PATH 192
191#endif
192#ifndef LEJP_STRING_CHUNK
193/* must be >= 30 to assemble floats */
194#define LEJP_STRING_CHUNK 254
195#endif
196
198 LEJP_SEEN_MINUS = (1 << 0),
199 LEJP_SEEN_POINT = (1 << 1),
201 LEJP_SEEN_EXP = (1 << 3)
202};
203
205 char s; /* lejp_state stack*/
206 char p; /* path length */
207 char i; /* index array length */
208 char b; /* user bitfield */
209};
210
212 void *user; /* private to the stack level */
213 signed char (*callback)(struct lejp_ctx *ctx, char reason);
214 const char * const *paths;
218};
219
220struct lejp_ctx {
221
222 /* sorted by type for most compact alignment
223 *
224 * pointers
225 */
226 void *user;
227
228 /* arrays */
229
232 uint16_t i[LEJP_MAX_INDEX_DEPTH]; /* index array */
236
237 /* size_t */
238
239 size_t path_stride; /* 0 means default ptr size, else stride */
240
241 /* int */
242
244
245 /* short */
246
248#define LEJP_FLAG_FEAT_OBJECT_INDEXES (1 << 0)
249#define LEJP_FLAG_FEAT_LEADING_WC (1 << 1)
250#define LEJP_FLAG_LATEST \
251 (LEJP_FLAG_FEAT_OBJECT_INDEXES | \
252 LEJP_FLAG_FEAT_LEADING_WC)
254
255 /* char */
256
260 uint8_t sp; /* stack head */
261 uint8_t ipos; /* index stack depth */
266 uint8_t pst_sp; /* parsing stack head */
268};
269
272 signed char (*callback)(struct lejp_ctx *ctx, char reason),
273 void *user, const char * const *paths, unsigned char paths_count);
274
277
279lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len);
280
283 signed char (*callback)(struct lejp_ctx *ctx, char reason));
284
285/*
286 * push the current paths / paths_count and lejp_cb to a stack in the ctx, and
287 * start using the new ones
288 */
290lejp_parser_push(struct lejp_ctx *ctx, void *user, const char * const *paths,
291 unsigned char paths_count, lejp_callback lejp_cb);
292
293/*
294 * pop the previously used paths / paths_count and lejp_cb, and continue
295 * parsing using those as before
296 */
299
300/* exported for use when reevaluating a path for use with a subcontext */
303
305lejp_get_wildcard(struct lejp_ctx *ctx, int wildcard, char *dest, int len);
306
307LWS_VISIBLE LWS_EXTERN const char *
unsigned short uint16_t
unsigned int uint32_t
#define LWS_EXTERN
unsigned char uint8_t
#define LWS_VISIBLE
lejp_states
Definition lws-lejp.h:40
@ LEJP_MP_VALUE_TOK
Definition lws-lejp.h:54
@ LEJP_MP_STRING
Definition lws-lejp.h:44
@ LEJP_M_P
Definition lws-lejp.h:43
@ LEJP_MP_STRING_ESC_U4
Definition lws-lejp.h:49
@ LEJP_MP_VALUE_NUM_EXP
Definition lws-lejp.h:53
@ LEJP_MEMBERS
Definition lws-lejp.h:42
@ LEJP_MP_STRING_ESC_U1
Definition lws-lejp.h:46
@ LEJP_MP_DELIM
Definition lws-lejp.h:50
@ LEJP_IDLE
Definition lws-lejp.h:41
@ LEJP_MP_VALUE_NUM_INT
Definition lws-lejp.h:52
@ LEJP_MP_STRING_ESC_U3
Definition lws-lejp.h:48
@ LEJP_MP_ARRAY_END
Definition lws-lejp.h:56
@ LEJP_MP_COMMA_OR_END
Definition lws-lejp.h:55
@ LEJP_MP_STRING_ESC
Definition lws-lejp.h:45
@ LEJP_MP_VALUE
Definition lws-lejp.h:51
@ LEJP_MP_STRING_ESC_U2
Definition lws-lejp.h:47
size_t path_stride
Definition lws-lejp.h:239
LWS_VISIBLE LWS_EXTERN void lejp_construct(struct lejp_ctx *ctx, signed char(*callback)(struct lejp_ctx *ctx, char reason), void *user, const char *const *paths, unsigned char paths_count)
struct _lejp_stack st[LEJP_MAX_DEPTH]
Definition lws-lejp.h:231
signed char(* callback)(struct lejp_ctx *ctx, char reason)
Definition lws-lejp.h:213
uint8_t outer_array
Definition lws-lejp.h:267
uint8_t f
Definition lws-lejp.h:259
uint8_t path_match
Definition lws-lejp.h:263
uint16_t uni
Definition lws-lejp.h:247
#define LEJP_MAX_PATH
Definition lws-lejp.h:190
#define LEJP_MAX_PARSING_STACK_DEPTH
Definition lws-lejp.h:181
uint8_t sp
Definition lws-lejp.h:260
uint8_t pst_sp
Definition lws-lejp.h:266
uint8_t ipos
Definition lws-lejp.h:261
LWS_VISIBLE LWS_EXTERN int lejp_parser_pop(struct lejp_ctx *ctx)
lejp_reasons
Definition lws-lejp.h:59
@ LEJP_REJECT_ILLEGAL_HEX
Definition lws-lejp.h:67
@ LEJP_REJECT_MP_C_OR_E_NEITHER
Definition lws-lejp.h:80
@ LEJP_REJECT_MP_VAL_NUM_FORMAT
Definition lws-lejp.h:71
@ LEJP_REJECT_MP_ARRAY_END_MISSING
Definition lws-lejp.h:76
@ LEJP_REJECT_UNKNOWN
Definition lws-lejp.h:81
@ LEJP_CONTINUE
Definition lws-lejp.h:60
@ LEJP_REJECT_MP_DELIM_MISSING_COLON
Definition lws-lejp.h:68
@ LEJP_REJECT_MP_C_OR_E_UNDERF
Definition lws-lejp.h:74
@ LEJP_REJECT_MP_STRING_ESC_ILLEGAL_ESC
Definition lws-lejp.h:66
@ LEJP_REJECT_MP_VAL_TOK_UNKNOWN
Definition lws-lejp.h:73
@ LEJP_REJECT_MP_C_OR_E_NOTARRAY
Definition lws-lejp.h:75
@ LEJP_REJECT_MP_VAL_NUM_INT_NO_FRAC
Definition lws-lejp.h:70
@ LEJP_REJECT_MEMBERS_NO_CLOSE
Definition lws-lejp.h:62
@ LEJP_REJECT_MP_DELIM_ISTACK
Definition lws-lejp.h:78
@ LEJP_REJECT_IDLE_NO_BRACE
Definition lws-lejp.h:61
@ LEJP_REJECT_CALLBACK
Definition lws-lejp.h:82
@ LEJP_REJECT_NUM_TOO_LONG
Definition lws-lejp.h:79
@ LEJP_REJECT_MP_STRING_UNDERRUN
Definition lws-lejp.h:64
@ LEJP_REJECT_MP_NO_OPEN_QUOTE
Definition lws-lejp.h:63
@ LEJP_REJECT_MP_ILLEGAL_CTRL
Definition lws-lejp.h:65
@ LEJP_REJECT_STACK_OVERFLOW
Definition lws-lejp.h:77
@ LEJP_REJECT_MP_DELIM_BAD_VALUE_START
Definition lws-lejp.h:69
@ LEJP_REJECT_MP_VAL_NUM_EXP_BAD_EXP
Definition lws-lejp.h:72
uint8_t count_paths
Definition lws-lejp.h:262
lejp_callbacks
Definition lws-lejp.h:87
@ LEJPCB_VAL_FALSE
Definition lws-lejp.h:98
@ LEJPCB_OBJECT_END
Definition lws-lejp.h:110
@ LEJPCB_USER_START
Definition lws-lejp.h:112
@ LEJPCB_START
Definition lws-lejp.h:91
@ LEJPCB_VAL_NUM_FLOAT
Definition lws-lejp.h:101
@ LEJPCB_ARRAY_END
Definition lws-lejp.h:107
@ LEJPCB_OBJECT_START
Definition lws-lejp.h:109
@ LEJPCB_VAL_TRUE
Definition lws-lejp.h:97
@ LEJPCB_VAL_NUM_INT
Definition lws-lejp.h:100
@ LEJPCB_CONSTRUCTED
Definition lws-lejp.h:88
@ LEJPCB_FAILED
Definition lws-lejp.h:93
@ LEJPCB_COMPLETE
Definition lws-lejp.h:92
@ LEJPCB_ARRAY_START
Definition lws-lejp.h:106
@ LEJPCB_VAL_STR_END
Definition lws-lejp.h:104
@ LEJPCB_VAL_NULL
Definition lws-lejp.h:99
@ LEJPCB_VAL_STR_CHUNK
Definition lws-lejp.h:103
@ LEJPCB_VAL_STR_START
Definition lws-lejp.h:102
@ LEJPCB_DESTRUCTED
Definition lws-lejp.h:89
@ LEJPCB_PAIR_NAME
Definition lws-lejp.h:95
LWS_VISIBLE LWS_EXTERN void lejp_check_path_match(struct lejp_ctx *ctx)
num_flags
Definition lws-lejp.h:197
@ LEJP_SEEN_EXP
Definition lws-lejp.h:201
@ LEJP_SEEN_POINT
Definition lws-lejp.h:199
@ LEJP_SEEN_MINUS
Definition lws-lejp.h:198
@ LEJP_SEEN_POST_POINT
Definition lws-lejp.h:200
LWS_VISIBLE LWS_EXTERN int lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len)
uint16_t wild[LEJP_MAX_INDEX_DEPTH]
Definition lws-lejp.h:233
void * user
Definition lws-lejp.h:226
const char *const * paths
Definition lws-lejp.h:214
LWS_VISIBLE LWS_EXTERN void lejp_change_callback(struct lejp_ctx *ctx, signed char(*callback)(struct lejp_ctx *ctx, char reason))
LWS_EXTERN signed char _lejp_callback(struct lejp_ctx *ctx, char reason)
#define LEJP_STRING_CHUNK
Definition lws-lejp.h:194
uint8_t path_match_len
Definition lws-lejp.h:264
LWS_VISIBLE LWS_EXTERN const char * lejp_error_to_string(int e)
uint8_t npos
Definition lws-lejp.h:257
uint8_t wildcount
Definition lws-lejp.h:265
LWS_VISIBLE LWS_EXTERN int lejp_parser_push(struct lejp_ctx *ctx, void *user, const char *const *paths, unsigned char paths_count, lejp_callback lejp_cb)
#define LEJP_FLAG_CB_IS_VALUE
Definition lws-lejp.h:85
#define LEJP_MAX_DEPTH
Definition lws-lejp.h:184
LWS_VISIBLE LWS_EXTERN void lejp_destruct(struct lejp_ctx *ctx)
signed char(* lejp_callback)(struct lejp_ctx *ctx, char reason)
Definition lws-lejp.h:178
uint16_t i[LEJP_MAX_INDEX_DEPTH]
Definition lws-lejp.h:232
uint16_t flags
Definition lws-lejp.h:253
uint8_t dcount
Definition lws-lejp.h:258
#define LEJP_MAX_INDEX_DEPTH
Definition lws-lejp.h:187
#define LEJP_FLAG_WS_KEEP
Definition lws-lejp.h:37
char buf[LEJP_STRING_CHUNK+1]
Definition lws-lejp.h:235
char path[LEJP_MAX_PATH]
Definition lws-lejp.h:234
uint32_t line
Definition lws-lejp.h:243
struct _lejp_parsing_stack pst[LEJP_MAX_PARSING_STACK_DEPTH]
Definition lws-lejp.h:230
LWS_VISIBLE LWS_EXTERN int lejp_get_wildcard(struct lejp_ctx *ctx, int wildcard, char *dest, int len)