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7c673cae FG |
1 | /*- |
2 | * BSD LICENSE | |
3 | * | |
4 | * Copyright (c) Intel Corporation. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * * Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * * Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * * Neither the name of Intel Corporation nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
24 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
25 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
26 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
27 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
11fdf7f2 TL |
34 | #include "spdk/json.h" |
35 | ||
36 | #include "spdk_internal/utf.h" | |
37 | ||
38 | #define SPDK_JSON_MAX_NESTING_DEPTH 64 | |
7c673cae FG |
39 | |
40 | static int | |
41 | hex_value(uint8_t c) | |
42 | { | |
43 | #define V(x, y) [x] = y + 1 | |
44 | static const int8_t val[256] = { | |
45 | V('0', 0), V('1', 1), V('2', 2), V('3', 3), V('4', 4), | |
46 | V('5', 5), V('6', 6), V('7', 7), V('8', 8), V('9', 9), | |
47 | V('A', 0xA), V('B', 0xB), V('C', 0xC), V('D', 0xD), V('E', 0xE), V('F', 0xF), | |
48 | V('a', 0xA), V('b', 0xB), V('c', 0xC), V('d', 0xD), V('e', 0xE), V('f', 0xF), | |
49 | }; | |
50 | #undef V | |
51 | ||
52 | return val[c] - 1; | |
53 | } | |
54 | ||
55 | static int | |
56 | json_decode_string_escape_unicode(uint8_t **strp, uint8_t *buf_end, uint8_t *out) | |
57 | { | |
58 | uint8_t *str = *strp; | |
59 | int v0, v1, v2, v3; | |
60 | uint32_t val; | |
61 | uint32_t surrogate_high = 0; | |
62 | int rc; | |
63 | decode: | |
64 | /* \uXXXX */ | |
65 | assert(buf_end > str); | |
66 | ||
11fdf7f2 TL |
67 | if (*str++ != '\\') { return SPDK_JSON_PARSE_INVALID; } |
68 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } | |
7c673cae | 69 | |
11fdf7f2 TL |
70 | if (*str++ != 'u') { return SPDK_JSON_PARSE_INVALID; } |
71 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } | |
7c673cae | 72 | |
11fdf7f2 TL |
73 | if ((v3 = hex_value(*str++)) < 0) { return SPDK_JSON_PARSE_INVALID; } |
74 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } | |
7c673cae | 75 | |
11fdf7f2 TL |
76 | if ((v2 = hex_value(*str++)) < 0) { return SPDK_JSON_PARSE_INVALID; } |
77 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } | |
7c673cae | 78 | |
11fdf7f2 TL |
79 | if ((v1 = hex_value(*str++)) < 0) { return SPDK_JSON_PARSE_INVALID; } |
80 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } | |
7c673cae | 81 | |
11fdf7f2 TL |
82 | if ((v0 = hex_value(*str++)) < 0) { return SPDK_JSON_PARSE_INVALID; } |
83 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } | |
7c673cae FG |
84 | |
85 | val = v0 | (v1 << 4) | (v2 << 8) | (v3 << 12); | |
86 | ||
87 | if (surrogate_high) { | |
88 | /* We already parsed the high surrogate, so this should be the low part. */ | |
89 | if (!utf16_valid_surrogate_low(val)) { | |
90 | return SPDK_JSON_PARSE_INVALID; | |
91 | } | |
92 | ||
93 | /* Convert UTF-16 surrogate pair into codepoint and fall through to utf8_encode. */ | |
94 | val = utf16_decode_surrogate_pair(surrogate_high, val); | |
95 | } else if (utf16_valid_surrogate_high(val)) { | |
96 | surrogate_high = val; | |
97 | ||
98 | /* | |
99 | * We parsed a \uXXXX sequence that decoded to the first half of a | |
100 | * UTF-16 surrogate pair, so it must be immediately followed by another | |
101 | * \uXXXX escape. | |
102 | * | |
103 | * Loop around to get the low half of the surrogate pair. | |
104 | */ | |
11fdf7f2 | 105 | if (buf_end == str) { return SPDK_JSON_PARSE_INCOMPLETE; } |
7c673cae FG |
106 | goto decode; |
107 | } else if (utf16_valid_surrogate_low(val)) { | |
108 | /* | |
109 | * We found the second half of surrogate pair without the first half; | |
110 | * this is an invalid encoding. | |
111 | */ | |
112 | return SPDK_JSON_PARSE_INVALID; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Convert Unicode escape (or surrogate pair) to UTF-8 in place. | |
117 | * | |
118 | * This is safe (will not write beyond the buffer) because the \uXXXX sequence is 6 bytes | |
119 | * (or 12 bytes for surrogate pairs), and the longest possible UTF-8 encoding of a | |
120 | * single codepoint is 4 bytes. | |
121 | */ | |
122 | if (out) { | |
123 | rc = utf8_encode_unsafe(out, val); | |
124 | } else { | |
125 | rc = utf8_codepoint_len(val); | |
126 | } | |
127 | if (rc < 0) { | |
128 | return SPDK_JSON_PARSE_INVALID; | |
129 | } | |
130 | ||
131 | *strp = str; /* update input pointer */ | |
132 | return rc; /* return number of bytes decoded */ | |
133 | } | |
134 | ||
135 | static int | |
136 | json_decode_string_escape_twochar(uint8_t **strp, uint8_t *buf_end, uint8_t *out) | |
137 | { | |
138 | static const uint8_t escapes[256] = { | |
139 | ['b'] = '\b', | |
140 | ['f'] = '\f', | |
141 | ['n'] = '\n', | |
142 | ['r'] = '\r', | |
143 | ['t'] = '\t', | |
144 | ['/'] = '/', | |
145 | ['"'] = '"', | |
146 | ['\\'] = '\\', | |
147 | }; | |
148 | uint8_t *str = *strp; | |
149 | uint8_t c; | |
150 | ||
151 | assert(buf_end > str); | |
152 | if (buf_end - str < 2) { | |
153 | return SPDK_JSON_PARSE_INCOMPLETE; | |
154 | } | |
155 | ||
156 | assert(str[0] == '\\'); | |
157 | ||
158 | c = escapes[str[1]]; | |
159 | if (c) { | |
160 | if (out) { | |
161 | *out = c; | |
162 | } | |
163 | *strp += 2; /* consumed two bytes */ | |
164 | return 1; /* produced one byte */ | |
165 | } | |
166 | ||
167 | return SPDK_JSON_PARSE_INVALID; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Decode JSON string backslash escape. | |
172 | * \param strp pointer to pointer to first character of escape (the backslash). | |
173 | * *strp is also advanced to indicate how much input was consumed. | |
174 | * | |
175 | * \return Number of bytes appended to out | |
176 | */ | |
177 | static int | |
178 | json_decode_string_escape(uint8_t **strp, uint8_t *buf_end, uint8_t *out) | |
179 | { | |
180 | int rc; | |
181 | ||
182 | rc = json_decode_string_escape_twochar(strp, buf_end, out); | |
183 | if (rc > 0) { | |
184 | return rc; | |
185 | } | |
186 | ||
187 | return json_decode_string_escape_unicode(strp, buf_end, out); | |
188 | } | |
189 | ||
190 | /* | |
191 | * Decode JSON string in place. | |
192 | * | |
193 | * \param str_start Pointer to the beginning of the string (the opening " character). | |
194 | * | |
195 | * \return Number of bytes in decoded string (beginning from start). | |
196 | */ | |
197 | static int | |
198 | json_decode_string(uint8_t *str_start, uint8_t *buf_end, uint8_t **str_end, uint32_t flags) | |
199 | { | |
200 | uint8_t *str = str_start; | |
201 | uint8_t *out = str_start + 1; /* Decode string in place (skip the initial quote) */ | |
202 | int rc; | |
203 | ||
204 | if (buf_end - str_start < 2) { | |
205 | /* | |
206 | * Shortest valid string (the empty string) is two bytes (""), | |
207 | * so this can't possibly be valid | |
208 | */ | |
209 | *str_end = str; | |
210 | return SPDK_JSON_PARSE_INCOMPLETE; | |
211 | } | |
212 | ||
213 | if (*str++ != '"') { | |
214 | *str_end = str; | |
215 | return SPDK_JSON_PARSE_INVALID; | |
216 | } | |
217 | ||
218 | while (str < buf_end) { | |
219 | if (str[0] == '"') { | |
220 | /* | |
221 | * End of string. | |
222 | * Update str_end to point at next input byte and return output length. | |
223 | */ | |
224 | *str_end = str + 1; | |
225 | return out - str_start - 1; | |
226 | } else if (str[0] == '\\') { | |
227 | rc = json_decode_string_escape(&str, buf_end, | |
228 | flags & SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE ? out : NULL); | |
229 | assert(rc != 0); | |
230 | if (rc < 0) { | |
231 | *str_end = str; | |
232 | return rc; | |
233 | } | |
234 | out += rc; | |
235 | } else if (str[0] <= 0x1f) { | |
236 | /* control characters must be escaped */ | |
237 | *str_end = str; | |
238 | return SPDK_JSON_PARSE_INVALID; | |
239 | } else { | |
240 | rc = utf8_valid(str, buf_end); | |
241 | if (rc == 0) { | |
242 | *str_end = str; | |
243 | return SPDK_JSON_PARSE_INCOMPLETE; | |
244 | } else if (rc < 0) { | |
245 | *str_end = str; | |
246 | return SPDK_JSON_PARSE_INVALID; | |
247 | } | |
248 | ||
249 | if (out && out != str && (flags & SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE)) { | |
250 | memmove(out, str, rc); | |
251 | } | |
252 | out += rc; | |
253 | str += rc; | |
254 | } | |
255 | } | |
256 | ||
257 | /* If execution gets here, we ran out of buffer. */ | |
258 | *str_end = str; | |
259 | return SPDK_JSON_PARSE_INCOMPLETE; | |
260 | } | |
261 | ||
262 | static int | |
263 | json_valid_number(uint8_t *start, uint8_t *buf_end) | |
264 | { | |
265 | uint8_t *p = start; | |
266 | uint8_t c; | |
267 | ||
11fdf7f2 | 268 | if (p >= buf_end) { return -1; } |
7c673cae FG |
269 | |
270 | c = *p++; | |
11fdf7f2 TL |
271 | if (c >= '1' && c <= '9') { goto num_int_digits; } |
272 | if (c == '0') { goto num_frac_or_exp; } | |
273 | if (c == '-') { goto num_int_first_digit; } | |
7c673cae FG |
274 | p--; |
275 | goto done_invalid; | |
276 | ||
277 | num_int_first_digit: | |
278 | if (spdk_likely(p != buf_end)) { | |
279 | c = *p++; | |
11fdf7f2 TL |
280 | if (c == '0') { goto num_frac_or_exp; } |
281 | if (c >= '1' && c <= '9') { goto num_int_digits; } | |
7c673cae FG |
282 | p--; |
283 | } | |
284 | goto done_invalid; | |
285 | ||
286 | num_int_digits: | |
287 | if (spdk_likely(p != buf_end)) { | |
288 | c = *p++; | |
11fdf7f2 TL |
289 | if (c >= '0' && c <= '9') { goto num_int_digits; } |
290 | if (c == '.') { goto num_frac_first_digit; } | |
291 | if (c == 'e' || c == 'E') { goto num_exp_sign; } | |
7c673cae FG |
292 | p--; |
293 | } | |
294 | goto done_valid; | |
295 | ||
296 | num_frac_or_exp: | |
297 | if (spdk_likely(p != buf_end)) { | |
298 | c = *p++; | |
11fdf7f2 TL |
299 | if (c == '.') { goto num_frac_first_digit; } |
300 | if (c == 'e' || c == 'E') { goto num_exp_sign; } | |
7c673cae FG |
301 | p--; |
302 | } | |
303 | goto done_valid; | |
304 | ||
305 | num_frac_first_digit: | |
306 | if (spdk_likely(p != buf_end)) { | |
307 | c = *p++; | |
11fdf7f2 | 308 | if (c >= '0' && c <= '9') { goto num_frac_digits; } |
7c673cae FG |
309 | p--; |
310 | } | |
311 | goto done_invalid; | |
312 | ||
313 | num_frac_digits: | |
314 | if (spdk_likely(p != buf_end)) { | |
315 | c = *p++; | |
11fdf7f2 TL |
316 | if (c >= '0' && c <= '9') { goto num_frac_digits; } |
317 | if (c == 'e' || c == 'E') { goto num_exp_sign; } | |
7c673cae FG |
318 | p--; |
319 | } | |
320 | goto done_valid; | |
321 | ||
322 | num_exp_sign: | |
323 | if (spdk_likely(p != buf_end)) { | |
324 | c = *p++; | |
11fdf7f2 TL |
325 | if (c >= '0' && c <= '9') { goto num_exp_digits; } |
326 | if (c == '-' || c == '+') { goto num_exp_first_digit; } | |
7c673cae FG |
327 | p--; |
328 | } | |
329 | goto done_invalid; | |
330 | ||
331 | num_exp_first_digit: | |
332 | if (spdk_likely(p != buf_end)) { | |
333 | c = *p++; | |
11fdf7f2 | 334 | if (c >= '0' && c <= '9') { goto num_exp_digits; } |
7c673cae FG |
335 | p--; |
336 | } | |
337 | goto done_invalid; | |
338 | ||
339 | num_exp_digits: | |
340 | if (spdk_likely(p != buf_end)) { | |
341 | c = *p++; | |
11fdf7f2 | 342 | if (c >= '0' && c <= '9') { goto num_exp_digits; } |
7c673cae FG |
343 | p--; |
344 | } | |
345 | goto done_valid; | |
346 | ||
347 | done_valid: | |
348 | /* Valid end state */ | |
349 | return p - start; | |
350 | ||
351 | done_invalid: | |
352 | /* Invalid end state */ | |
353 | if (p == buf_end) { | |
354 | /* Hit the end of the buffer - the stream is incomplete. */ | |
355 | return SPDK_JSON_PARSE_INCOMPLETE; | |
356 | } | |
357 | ||
358 | /* Found an invalid character in an invalid end state */ | |
359 | return SPDK_JSON_PARSE_INVALID; | |
360 | } | |
361 | ||
362 | static int | |
363 | json_valid_comment(const uint8_t *start, const uint8_t *buf_end) | |
364 | { | |
365 | const uint8_t *p = start; | |
366 | bool multiline; | |
367 | ||
368 | assert(buf_end > p); | |
369 | if (buf_end - p < 2) { | |
370 | return SPDK_JSON_PARSE_INCOMPLETE; | |
371 | } | |
372 | ||
373 | if (p[0] != '/') { | |
374 | return SPDK_JSON_PARSE_INVALID; | |
375 | } | |
376 | if (p[1] == '*') { | |
377 | multiline = true; | |
378 | } else if (p[1] == '/') { | |
379 | multiline = false; | |
380 | } else { | |
381 | return SPDK_JSON_PARSE_INVALID; | |
382 | } | |
383 | p += 2; | |
384 | ||
385 | if (multiline) { | |
386 | while (p != buf_end - 1) { | |
387 | if (p[0] == '*' && p[1] == '/') { | |
388 | /* Include the terminating star and slash in the comment */ | |
389 | return p - start + 2; | |
390 | } | |
391 | p++; | |
392 | } | |
393 | } else { | |
394 | while (p != buf_end) { | |
395 | if (*p == '\r' || *p == '\n') { | |
396 | /* Do not include the line terminator in the comment */ | |
397 | return p - start; | |
398 | } | |
399 | p++; | |
400 | } | |
401 | } | |
402 | ||
403 | return SPDK_JSON_PARSE_INCOMPLETE; | |
404 | } | |
405 | ||
406 | struct json_literal { | |
407 | enum spdk_json_val_type type; | |
408 | uint32_t len; | |
409 | uint8_t str[8]; | |
410 | }; | |
411 | ||
412 | /* | |
413 | * JSON only defines 3 possible literals; they can be uniquely identified by bits | |
414 | * 3 and 4 of the first character: | |
415 | * 'f' = 0b11[00]110 | |
416 | * 'n' = 0b11[01]110 | |
417 | * 't' = 0b11[10]100 | |
418 | * These two bits can be used as an index into the g_json_literals array. | |
419 | */ | |
420 | static const struct json_literal g_json_literals[] = { | |
421 | {SPDK_JSON_VAL_FALSE, 5, "false"}, | |
422 | {SPDK_JSON_VAL_NULL, 4, "null"}, | |
423 | {SPDK_JSON_VAL_TRUE, 4, "true"}, | |
424 | {} | |
425 | }; | |
426 | ||
427 | static int | |
428 | match_literal(const uint8_t *start, const uint8_t *end, const uint8_t *literal, size_t len) | |
429 | { | |
430 | assert(end >= start); | |
431 | if ((size_t)(end - start) < len) { | |
432 | return SPDK_JSON_PARSE_INCOMPLETE; | |
433 | } | |
434 | ||
435 | if (memcmp(start, literal, len) != 0) { | |
436 | return SPDK_JSON_PARSE_INVALID; | |
437 | } | |
438 | ||
439 | return len; | |
440 | } | |
441 | ||
442 | ssize_t | |
443 | spdk_json_parse(void *json, size_t size, struct spdk_json_val *values, size_t num_values, | |
444 | void **end, uint32_t flags) | |
445 | { | |
446 | uint8_t *json_end = json + size; | |
447 | enum spdk_json_val_type containers[SPDK_JSON_MAX_NESTING_DEPTH]; | |
448 | size_t con_value[SPDK_JSON_MAX_NESTING_DEPTH]; | |
449 | enum spdk_json_val_type con_type = SPDK_JSON_VAL_INVALID; | |
450 | bool trailing_comma = false; | |
451 | size_t depth = 0; /* index into containers */ | |
452 | size_t cur_value = 0; /* index into values */ | |
453 | size_t con_start_value; | |
454 | uint8_t *data = json; | |
455 | uint8_t *new_data; | |
456 | int rc = 0; | |
457 | const struct json_literal *lit; | |
458 | enum { | |
459 | STATE_VALUE, /* initial state */ | |
460 | STATE_VALUE_SEPARATOR, /* value separator (comma) */ | |
461 | STATE_NAME, /* "name": value */ | |
462 | STATE_NAME_SEPARATOR, /* colon */ | |
463 | STATE_END, /* parsed the complete value, so only whitespace is valid */ | |
464 | } state = STATE_VALUE; | |
465 | ||
466 | #define ADD_VALUE(t, val_start_ptr, val_end_ptr) \ | |
467 | if (values && cur_value < num_values) { \ | |
468 | values[cur_value].type = t; \ | |
469 | values[cur_value].start = val_start_ptr; \ | |
470 | values[cur_value].len = val_end_ptr - val_start_ptr; \ | |
471 | } \ | |
472 | cur_value++ | |
473 | ||
474 | while (data < json_end) { | |
475 | uint8_t c = *data; | |
476 | ||
477 | switch (c) { | |
478 | case ' ': | |
479 | case '\t': | |
480 | case '\r': | |
481 | case '\n': | |
482 | /* Whitespace is allowed between any tokens. */ | |
483 | data++; | |
484 | break; | |
485 | ||
486 | case 't': | |
487 | case 'f': | |
488 | case 'n': | |
489 | /* true, false, or null */ | |
11fdf7f2 | 490 | if (state != STATE_VALUE) { goto done_invalid; } |
7c673cae FG |
491 | lit = &g_json_literals[(c >> 3) & 3]; /* See comment above g_json_literals[] */ |
492 | assert(lit->str[0] == c); | |
493 | rc = match_literal(data, json_end, lit->str, lit->len); | |
11fdf7f2 | 494 | if (rc < 0) { goto done_rc; } |
7c673cae FG |
495 | ADD_VALUE(lit->type, data, data + rc); |
496 | data += rc; | |
497 | state = depth ? STATE_VALUE_SEPARATOR : STATE_END; | |
498 | trailing_comma = false; | |
499 | break; | |
500 | ||
501 | case '"': | |
11fdf7f2 | 502 | if (state != STATE_VALUE && state != STATE_NAME) { goto done_invalid; } |
7c673cae FG |
503 | rc = json_decode_string(data, json_end, &new_data, flags); |
504 | if (rc < 0) { | |
505 | data = new_data; | |
506 | goto done_rc; | |
507 | } | |
508 | /* | |
509 | * Start is data + 1 to skip initial quote. | |
510 | * Length is data + rc - 1 to skip both quotes. | |
511 | */ | |
512 | ADD_VALUE(state == STATE_VALUE ? SPDK_JSON_VAL_STRING : SPDK_JSON_VAL_NAME, | |
513 | data + 1, data + rc - 1); | |
514 | data = new_data; | |
515 | if (state == STATE_NAME) { | |
516 | state = STATE_NAME_SEPARATOR; | |
517 | } else { | |
518 | state = depth ? STATE_VALUE_SEPARATOR : STATE_END; | |
519 | } | |
520 | trailing_comma = false; | |
521 | break; | |
522 | ||
523 | case '-': | |
524 | case '0': | |
525 | case '1': | |
526 | case '2': | |
527 | case '3': | |
528 | case '4': | |
529 | case '5': | |
530 | case '6': | |
531 | case '7': | |
532 | case '8': | |
533 | case '9': | |
11fdf7f2 | 534 | if (state != STATE_VALUE) { goto done_invalid; } |
7c673cae | 535 | rc = json_valid_number(data, json_end); |
11fdf7f2 | 536 | if (rc < 0) { goto done_rc; } |
7c673cae FG |
537 | ADD_VALUE(SPDK_JSON_VAL_NUMBER, data, data + rc); |
538 | data += rc; | |
539 | state = depth ? STATE_VALUE_SEPARATOR : STATE_END; | |
540 | trailing_comma = false; | |
541 | break; | |
542 | ||
543 | case '{': | |
544 | case '[': | |
11fdf7f2 | 545 | if (state != STATE_VALUE) { goto done_invalid; } |
7c673cae FG |
546 | if (depth == SPDK_JSON_MAX_NESTING_DEPTH) { |
547 | rc = SPDK_JSON_PARSE_MAX_DEPTH_EXCEEDED; | |
548 | goto done_rc; | |
549 | } | |
550 | if (c == '{') { | |
551 | con_type = SPDK_JSON_VAL_OBJECT_BEGIN; | |
552 | state = STATE_NAME; | |
553 | } else { | |
554 | con_type = SPDK_JSON_VAL_ARRAY_BEGIN; | |
555 | state = STATE_VALUE; | |
556 | } | |
557 | con_value[depth] = cur_value; | |
558 | containers[depth++] = con_type; | |
559 | ADD_VALUE(con_type, data, data + 1); | |
560 | data++; | |
561 | trailing_comma = false; | |
562 | break; | |
563 | ||
564 | case '}': | |
565 | case ']': | |
11fdf7f2 TL |
566 | if (trailing_comma) { goto done_invalid; } |
567 | if (depth == 0) { goto done_invalid; } | |
7c673cae FG |
568 | con_type = containers[--depth]; |
569 | con_start_value = con_value[depth]; | |
570 | if (values && con_start_value < num_values) { | |
571 | values[con_start_value].len = cur_value - con_start_value - 1; | |
572 | } | |
573 | if (c == '}') { | |
574 | if (state != STATE_NAME && state != STATE_VALUE_SEPARATOR) { | |
575 | goto done_invalid; | |
576 | } | |
577 | if (con_type != SPDK_JSON_VAL_OBJECT_BEGIN) { | |
578 | goto done_invalid; | |
579 | } | |
580 | ADD_VALUE(SPDK_JSON_VAL_OBJECT_END, data, data + 1); | |
581 | } else { | |
582 | if (state != STATE_VALUE && state != STATE_VALUE_SEPARATOR) { | |
583 | goto done_invalid; | |
584 | } | |
585 | if (con_type != SPDK_JSON_VAL_ARRAY_BEGIN) { | |
586 | goto done_invalid; | |
587 | } | |
588 | ADD_VALUE(SPDK_JSON_VAL_ARRAY_END, data, data + 1); | |
589 | } | |
590 | con_type = depth == 0 ? SPDK_JSON_VAL_INVALID : containers[depth - 1]; | |
591 | data++; | |
592 | state = depth ? STATE_VALUE_SEPARATOR : STATE_END; | |
593 | trailing_comma = false; | |
594 | break; | |
595 | ||
596 | case ',': | |
11fdf7f2 | 597 | if (state != STATE_VALUE_SEPARATOR) { goto done_invalid; } |
7c673cae FG |
598 | data++; |
599 | assert(con_type == SPDK_JSON_VAL_ARRAY_BEGIN || | |
600 | con_type == SPDK_JSON_VAL_OBJECT_BEGIN); | |
601 | state = con_type == SPDK_JSON_VAL_ARRAY_BEGIN ? STATE_VALUE : STATE_NAME; | |
602 | trailing_comma = true; | |
603 | break; | |
604 | ||
605 | case ':': | |
11fdf7f2 | 606 | if (state != STATE_NAME_SEPARATOR) { goto done_invalid; } |
7c673cae FG |
607 | data++; |
608 | state = STATE_VALUE; | |
609 | break; | |
610 | ||
611 | case '/': | |
612 | if (!(flags & SPDK_JSON_PARSE_FLAG_ALLOW_COMMENTS)) { | |
613 | goto done_invalid; | |
614 | } | |
615 | rc = json_valid_comment(data, json_end); | |
11fdf7f2 | 616 | if (rc < 0) { goto done_rc; } |
7c673cae FG |
617 | /* Skip over comment */ |
618 | data += rc; | |
619 | break; | |
620 | ||
621 | default: | |
622 | goto done_invalid; | |
623 | } | |
624 | ||
625 | if (state == STATE_END) { | |
626 | break; | |
627 | } | |
628 | } | |
629 | ||
630 | if (state == STATE_END) { | |
631 | /* Skip trailing whitespace */ | |
632 | while (data < json_end) { | |
633 | uint8_t c = *data; | |
634 | ||
635 | if (c == ' ' || c == '\t' || c == '\r' || c == '\n') { | |
636 | data++; | |
637 | } else { | |
638 | break; | |
639 | } | |
640 | } | |
641 | ||
642 | /* | |
643 | * These asserts are just for sanity checking - they are guaranteed by the allowed | |
644 | * state transitions. | |
645 | */ | |
646 | assert(depth == 0); | |
647 | assert(trailing_comma == false); | |
648 | assert(data <= json_end); | |
649 | if (end) { | |
650 | *end = data; | |
651 | } | |
652 | return cur_value; | |
653 | } | |
654 | ||
655 | /* Invalid end state - ran out of data */ | |
656 | rc = SPDK_JSON_PARSE_INCOMPLETE; | |
657 | ||
658 | done_rc: | |
659 | assert(rc < 0); | |
660 | if (end) { | |
661 | *end = data; | |
662 | } | |
663 | return rc; | |
664 | ||
665 | done_invalid: | |
666 | rc = SPDK_JSON_PARSE_INVALID; | |
667 | goto done_rc; | |
668 | } |