[101] | 1 | /* Copyright (C) 2012-2015 Mark Nunberg.
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| 2 | *
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| 3 | * See included LICENSE file for license details.
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| 4 | */
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| 5 | /* copy from LICENSE file
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| 6 | Copyright (c) 2012-2015 M. Nunberg, mnunberg@haskalah.org
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| 7 |
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| 8 | Permission is hereby granted, free of charge, to any person obtaining
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| 9 | a copy of this software and associated documentation files (the
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| 10 | "Software"), to deal in the Software without restriction, including
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| 11 | without limitation the rights to use, copy, modify, merge, publish,
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| 12 | distribute, sublicense, and/or sell copies of the Software, and to
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| 13 | permit persons to whom the Software is furnished to do so, subject to
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| 14 | the following conditions:
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| 15 |
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| 16 | The above copyright notice and this permission notice shall be
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| 17 | included in all copies or substantial portions of the Software.
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| 18 |
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| 19 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 20 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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| 21 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 22 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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| 23 | LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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| 24 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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| 25 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 26 | */
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| 27 | #include "jsonsl.h"
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| 28 | //#include <assert.h>
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| 29 | #include <limits.h>
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| 30 | #include <ctype.h>
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| 31 |
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| 32 | #ifdef JSONSL_USE_METRICS
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| 33 | #define XMETRICS \
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| 34 | X(STRINGY_INSIGNIFICANT) \
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| 35 | X(STRINGY_SLOWPATH) \
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| 36 | X(ALLOWED_WHITESPACE) \
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| 37 | X(QUOTE_FASTPATH) \
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| 38 | X(SPECIAL_FASTPATH) \
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| 39 | X(SPECIAL_WSPOP) \
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| 40 | X(SPECIAL_SLOWPATH) \
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| 41 | X(GENERIC) \
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| 42 | X(STRUCTURAL_TOKEN) \
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| 43 | X(SPECIAL_SWITCHFIRST) \
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| 44 | X(STRINGY_CATCH) \
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| 45 | X(ESCAPES) \
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| 46 | X(TOTAL) \
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| 47 |
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| 48 | struct jsonsl_metrics_st {
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| 49 | #define X(m) \
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| 50 | unsigned long metric_##m;
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| 51 | XMETRICS
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| 52 | #undef X
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| 53 | };
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| 54 |
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| 55 | static struct jsonsl_metrics_st GlobalMetrics = { 0 };
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| 56 | static unsigned long GenericCounter[0x100] = { 0 };
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| 57 | static unsigned long StringyCatchCounter[0x100] = { 0 };
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| 58 |
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| 59 | #define INCR_METRIC(m) \
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| 60 | GlobalMetrics.metric_##m++;
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| 61 |
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| 62 | #define INCR_GENERIC(c) \
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| 63 | INCR_METRIC(GENERIC); \
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| 64 | GenericCounter[c]++; \
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| 65 |
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| 66 | #define INCR_STRINGY_CATCH(c) \
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| 67 | INCR_METRIC(STRINGY_CATCH); \
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| 68 | StringyCatchCounter[c]++;
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| 69 |
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| 70 | JSONSL_API
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| 71 | void jsonsl_dump_global_metrics(void)
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| 72 | {
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| 73 | int ii;
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| 74 | printf("JSONSL Metrics:\n");
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| 75 | #define X(m) \
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| 76 | printf("\t%-30s %20lu (%0.2f%%)\n", #m, GlobalMetrics.metric_##m, \
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| 77 | (float)((float)(GlobalMetrics.metric_##m/(float)GlobalMetrics.metric_TOTAL)) * 100);
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| 78 | XMETRICS
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| 79 | #undef X
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| 80 | printf("Generic Characters:\n");
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| 81 | for (ii = 0; ii < 0xff; ii++) {
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| 82 | if (GenericCounter[ii]) {
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| 83 | printf("\t[ %c ] %lu\n", ii, GenericCounter[ii]);
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| 84 | }
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| 85 | }
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| 86 | printf("Weird string loop\n");
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| 87 | for (ii = 0; ii < 0xff; ii++) {
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| 88 | if (StringyCatchCounter[ii]) {
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| 89 | printf("\t[ %c ] %lu\n", ii, StringyCatchCounter[ii]);
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| 90 | }
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | #else
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| 95 | #define INCR_METRIC(m)
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| 96 | #define INCR_GENERIC(c)
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| 97 | #define INCR_STRINGY_CATCH(c)
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| 98 | JSONSL_API
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| 99 | void jsonsl_dump_global_metrics(void) { }
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| 100 | #endif /* JSONSL_USE_METRICS */
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| 101 |
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| 102 | #define CASE_DIGITS \
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| 103 | case '1': \
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| 104 | case '2': \
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| 105 | case '3': \
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| 106 | case '4': \
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| 107 | case '5': \
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| 108 | case '6': \
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| 109 | case '7': \
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| 110 | case '8': \
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| 111 | case '9': \
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| 112 | case '0':
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| 113 |
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| 114 | static unsigned extract_special(unsigned);
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| 115 | static int is_special_end(unsigned);
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| 116 | static int is_allowed_whitespace(unsigned);
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| 117 | static int is_allowed_escape(unsigned);
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| 118 | static char get_escape_equiv(unsigned);
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| 119 |
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| 120 | JSONSL_API
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| 121 | jsonsl_t jsonsl_new(struct jsonsl_st *jsn, int nlevels)
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| 122 | {
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| 123 | jsn->levels_max = nlevels;
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| 124 | jsn->max_callback_level = -1;
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| 125 | jsonsl_reset(jsn);
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| 126 | return jsn;
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| 127 | }
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| 128 |
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| 129 | JSONSL_API
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| 130 | void jsonsl_reset(jsonsl_t jsn)
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| 131 | {
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| 132 | unsigned int ii;
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| 133 | jsn->tok_last = 0;
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| 134 | jsn->can_insert = 1;
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| 135 | jsn->pos = 0;
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| 136 | jsn->level = 0;
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| 137 | jsn->stopfl = 0;
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| 138 | jsn->in_escape = 0;
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| 139 | jsn->expecting = 0;
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| 140 |
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| 141 | memset(jsn->stack, 0, (jsn->levels_max * sizeof (struct jsonsl_state_st)));
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| 142 |
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| 143 | for (ii = 0; ii < jsn->levels_max; ii++) {
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| 144 | jsn->stack[ii].level = ii;
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| 145 | }
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| 146 | }
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| 147 |
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| 148 | JSONSL_API
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| 149 | void jsonsl_destroy(jsonsl_t jsn)
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| 150 | {
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| 151 | }
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| 152 |
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| 153 | JSONSL_API
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| 154 | void
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| 155 | jsonsl_feed(jsonsl_t jsn, const jsonsl_char_t *bytes, size_t nbytes)
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| 156 | {
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| 157 |
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| 158 | #define INVOKE_ERROR(eb) \
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| 159 | if (jsn->error_callback(jsn, JSONSL_ERROR_##eb, state, (char*)c)) { \
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| 160 | goto GT_AGAIN; \
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| 161 | } \
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| 162 | return;
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| 163 |
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| 164 | #define STACK_PUSH \
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| 165 | if (jsn->level >= (levels_max-1)) { \
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| 166 | jsn->error_callback(jsn, JSONSL_ERROR_LEVELS_EXCEEDED, state, (char*)c); \
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| 167 | return; \
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| 168 | } \
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| 169 | state = jsn->stack + (++jsn->level); \
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| 170 | state->ignore_callback = jsn->stack[jsn->level-1].ignore_callback; \
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| 171 | state->pos_begin = jsn->pos;
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| 172 |
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| 173 | #define STACK_POP_NOPOS \
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| 174 | state->pos_cur = jsn->pos; \
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| 175 | state = jsn->stack + (--jsn->level);
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| 176 |
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| 177 |
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| 178 | #define STACK_POP \
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| 179 | STACK_POP_NOPOS; \
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| 180 | state->pos_cur = jsn->pos;
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| 181 |
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| 182 | #define CALLBACK_AND_POP_NOPOS(T) \
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| 183 | state->pos_cur = jsn->pos; \
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| 184 | DO_CALLBACK(T, POP); \
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| 185 | state->nescapes = 0; \
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| 186 | state = jsn->stack + (--jsn->level);
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| 187 |
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| 188 | #define CALLBACK_AND_POP(T) \
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| 189 | CALLBACK_AND_POP_NOPOS(T); \
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| 190 | state->pos_cur = jsn->pos;
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| 191 |
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| 192 | #define SPECIAL_POP \
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| 193 | CALLBACK_AND_POP(SPECIAL); \
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| 194 | jsn->expecting = 0; \
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| 195 | jsn->tok_last = 0; \
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| 196 |
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| 197 | #define CUR_CHAR (*(jsonsl_uchar_t*)c)
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| 198 |
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| 199 | #define DO_CALLBACK(T, action) \
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| 200 | if (jsn->call_##T && \
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| 201 | jsn->max_callback_level > state->level && \
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| 202 | state->ignore_callback == 0) { \
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| 203 | \
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| 204 | if (jsn->action_callback_##action) { \
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| 205 | jsn->action_callback_##action(jsn, JSONSL_ACTION_##action, state, (jsonsl_char_t*)c); \
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| 206 | } else if (jsn->action_callback) { \
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| 207 | jsn->action_callback(jsn, JSONSL_ACTION_##action, state, (jsonsl_char_t*)c); \
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| 208 | } \
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| 209 | if (jsn->stopfl) { return; } \
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| 210 | }
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| 211 |
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| 212 | /**
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| 213 | * Verifies that we are able to insert the (non-string) item into a hash.
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| 214 | */
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| 215 | #define ENSURE_HVAL \
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| 216 | if (state->nelem % 2 == 0 && state->type == JSONSL_T_OBJECT) { \
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| 217 | INVOKE_ERROR(HKEY_EXPECTED); \
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| 218 | }
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| 219 |
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| 220 | #define VERIFY_SPECIAL(lit) \
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| 221 | if (CUR_CHAR != (lit)[jsn->pos - state->pos_begin]) { \
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| 222 | INVOKE_ERROR(SPECIAL_EXPECTED); \
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| 223 | }
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| 224 |
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| 225 | const jsonsl_uchar_t *c = (jsonsl_uchar_t*)bytes;
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| 226 | size_t levels_max = jsn->levels_max;
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| 227 | struct jsonsl_state_st *state = jsn->stack + jsn->level;
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| 228 | static int chrt_string_nopass[0x100] = { JSONSL_CHARTABLE_string_nopass };
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| 229 | jsn->base = bytes;
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| 230 |
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| 231 | for (; nbytes; nbytes--, jsn->pos++, c++) {
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| 232 | register unsigned state_type;
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| 233 | INCR_METRIC(TOTAL);
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| 234 | /* Special escape handling for some stuff */
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| 235 | if (jsn->in_escape) {
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| 236 | jsn->in_escape = 0;
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| 237 | if (!is_allowed_escape(CUR_CHAR)) {
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| 238 | INVOKE_ERROR(ESCAPE_INVALID);
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| 239 | } else if (CUR_CHAR == 'u') {
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| 240 | DO_CALLBACK(UESCAPE, UESCAPE);
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| 241 | if (jsn->return_UESCAPE) {
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| 242 | return;
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| 243 | }
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| 244 | }
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| 245 | goto GT_NEXT;
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| 246 | }
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| 247 | GT_AGAIN:
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| 248 | /**
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| 249 | * Several fast-tracks for common cases:
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| 250 | */
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| 251 | state_type = state->type;
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| 252 | if (state_type & JSONSL_Tf_STRINGY) {
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| 253 | /* check if our character cannot ever change our current string state
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| 254 | * or throw an error
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| 255 | */
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| 256 | if (
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| 257 | #ifdef JSONSL_USE_WCHAR
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| 258 | CUR_CHAR >= 0x100 ||
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| 259 | #endif /* JSONSL_USE_WCHAR */
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| 260 | (!chrt_string_nopass[CUR_CHAR & 0xff])) {
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| 261 | INCR_METRIC(STRINGY_INSIGNIFICANT);
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| 262 | goto GT_NEXT;
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| 263 | } else if (CUR_CHAR == '"') {
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| 264 | goto GT_QUOTE;
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| 265 | } else if (CUR_CHAR == '\\') {
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| 266 | goto GT_ESCAPE;
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| 267 | } else {
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| 268 | INVOKE_ERROR(WEIRD_WHITESPACE);
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| 269 | }
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| 270 | INCR_METRIC(STRINGY_SLOWPATH);
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| 271 |
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| 272 | } else if (state_type == JSONSL_T_SPECIAL) {
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| 273 | if (state->special_flags & JSONSL_SPECIALf_NUMERIC) {
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| 274 | switch (CUR_CHAR) {
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| 275 | CASE_DIGITS
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| 276 | state->nelem = (state->nelem*10) + (CUR_CHAR-0x30);
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| 277 | goto GT_NEXT;
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| 278 |
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| 279 | case 'e':
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| 280 | case 'E':
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| 281 | case '-':
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| 282 | case '+':
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| 283 | state->special_flags |= JSONSL_SPECIALf_EXPONENT;
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| 284 | goto GT_NEXT;
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| 285 | case '.':
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| 286 | state->special_flags |= JSONSL_SPECIALf_FLOAT;
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| 287 | goto GT_NEXT;
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| 288 | default:
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| 289 | if (is_special_end(CUR_CHAR)) {
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| 290 | goto GT_SPECIAL_POP;
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| 291 | }
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| 292 | INVOKE_ERROR(INVALID_NUMBER);
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| 293 | break;
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| 294 | }
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| 295 | }
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| 296 | /* else if (!NUMERIC) */
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| 297 | if (!is_special_end(CUR_CHAR)) {
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| 298 | /* Verify TRUE, FALSE, NULL */
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| 299 | if (state->special_flags == JSONSL_SPECIALf_TRUE) {
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| 300 | VERIFY_SPECIAL("true");
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| 301 | } else if (state->special_flags == JSONSL_SPECIALf_FALSE) {
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| 302 | VERIFY_SPECIAL("false");
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| 303 | } else if (state->special_flags == JSONSL_SPECIALf_NULL) {
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| 304 | VERIFY_SPECIAL("null");
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| 305 | }
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| 306 | INCR_METRIC(SPECIAL_FASTPATH);
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| 307 | goto GT_NEXT;
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| 308 | }
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| 309 |
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| 310 | GT_SPECIAL_POP:
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| 311 | SPECIAL_POP;
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| 312 | jsn->expecting = ',';
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| 313 | if (is_allowed_whitespace(CUR_CHAR)) {
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| 314 | goto GT_NEXT;
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| 315 | }
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| 316 | /**
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| 317 | * This works because we have a non-whitespace token
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| 318 | * which is not a special token. If this is a structural
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| 319 | * character then it will be gracefully handled by the
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| 320 | * switch statement. Otherwise it will default to the 'special'
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| 321 | * state again,
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| 322 | */
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| 323 | goto GT_STRUCTURAL_TOKEN;
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| 324 | } else if (is_allowed_whitespace(CUR_CHAR)) {
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| 325 | INCR_METRIC(ALLOWED_WHITESPACE);
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| 326 | /* So we're not special. Harmless insignificant whitespace
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| 327 | * passthrough
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| 328 | */
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| 329 | goto GT_NEXT;
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| 330 | } else if (extract_special(CUR_CHAR)) {
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| 331 | /* not a string, whitespace, or structural token. must be special */
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| 332 | goto GT_SPECIAL_BEGIN;
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| 333 | }
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| 334 |
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| 335 | INCR_GENERIC(CUR_CHAR);
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| 336 |
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| 337 | if (CUR_CHAR == '"') {
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| 338 | GT_QUOTE:
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| 339 | jsn->can_insert = 0;
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| 340 | switch (state_type) {
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| 341 |
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| 342 | /* the end of a string or hash key */
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| 343 | case JSONSL_T_STRING:
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| 344 | CALLBACK_AND_POP(STRING);
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| 345 | goto GT_NEXT;
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| 346 | case JSONSL_T_HKEY:
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| 347 | CALLBACK_AND_POP(HKEY);
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| 348 | goto GT_NEXT;
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| 349 |
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| 350 | case JSONSL_T_OBJECT:
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| 351 | state->nelem++;
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| 352 | if ( (state->nelem-1) % 2 ) {
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| 353 | /* Odd, this must be a hash value */
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| 354 | if (jsn->tok_last != ':') {
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| 355 | INVOKE_ERROR(MISSING_TOKEN);
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| 356 | }
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| 357 | jsn->expecting = ','; /* Can't figure out what to expect next */
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| 358 | jsn->tok_last = 0;
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| 359 |
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| 360 | STACK_PUSH;
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| 361 | state->type = JSONSL_T_STRING;
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| 362 | DO_CALLBACK(STRING, PUSH);
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| 363 |
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| 364 | } else {
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| 365 | /* hash key */
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| 366 | if (jsn->expecting != '"') {
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| 367 | INVOKE_ERROR(STRAY_TOKEN);
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| 368 | }
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| 369 | jsn->tok_last = 0;
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| 370 | jsn->expecting = ':';
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| 371 |
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| 372 | STACK_PUSH;
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| 373 | state->type = JSONSL_T_HKEY;
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| 374 | DO_CALLBACK(HKEY, PUSH);
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| 375 | }
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| 376 | goto GT_NEXT;
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| 377 |
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| 378 | case JSONSL_T_LIST:
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| 379 | state->nelem++;
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| 380 | STACK_PUSH;
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| 381 | state->type = JSONSL_T_STRING;
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| 382 | jsn->expecting = ',';
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| 383 | jsn->tok_last = 0;
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| 384 | DO_CALLBACK(STRING, PUSH);
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| 385 | goto GT_NEXT;
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| 386 |
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| 387 | case JSONSL_T_SPECIAL:
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| 388 | INVOKE_ERROR(STRAY_TOKEN);
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| 389 | break;
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| 390 |
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| 391 | default:
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| 392 | INVOKE_ERROR(STRING_OUTSIDE_CONTAINER);
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| 393 | break;
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| 394 | } /* switch(state->type) */
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| 395 | } else if (CUR_CHAR == '\\') {
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| 396 | GT_ESCAPE:
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| 397 | INCR_METRIC(ESCAPES);
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| 398 | /* Escape */
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| 399 | if ( (state->type & JSONSL_Tf_STRINGY) == 0 ) {
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| 400 | INVOKE_ERROR(ESCAPE_OUTSIDE_STRING);
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| 401 | }
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| 402 | state->nescapes++;
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| 403 | jsn->in_escape = 1;
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| 404 | goto GT_NEXT;
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| 405 | } /* " or \ */
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| 406 |
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| 407 | GT_STRUCTURAL_TOKEN:
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| 408 | switch (CUR_CHAR) {
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| 409 | case ':':
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| 410 | INCR_METRIC(STRUCTURAL_TOKEN);
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| 411 | if (jsn->expecting != CUR_CHAR) {
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| 412 | INVOKE_ERROR(STRAY_TOKEN);
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| 413 | }
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| 414 | jsn->tok_last = ':';
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| 415 | jsn->can_insert = 1;
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| 416 | jsn->expecting = '"';
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| 417 | goto GT_NEXT;
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| 418 |
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| 419 | case ',':
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| 420 | INCR_METRIC(STRUCTURAL_TOKEN);
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| 421 | /**
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| 422 | * The comma is one of the more generic tokens.
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| 423 | * In the context of an OBJECT, the can_insert flag
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| 424 | * should never be set, and no other action is
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| 425 | * necessary.
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| 426 | */
|
---|
| 427 | if (jsn->expecting != CUR_CHAR) {
|
---|
| 428 | /* make this branch execute only when we haven't manually
|
---|
| 429 | * just placed the ',' in the expecting register.
|
---|
| 430 | */
|
---|
| 431 | INVOKE_ERROR(STRAY_TOKEN);
|
---|
| 432 | }
|
---|
| 433 |
|
---|
| 434 | if (state->type == JSONSL_T_OBJECT) {
|
---|
| 435 | /* end of hash value, expect a string as a hash key */
|
---|
| 436 | jsn->expecting = '"';
|
---|
| 437 | } else {
|
---|
| 438 | jsn->can_insert = 1;
|
---|
| 439 | }
|
---|
| 440 |
|
---|
| 441 | jsn->tok_last = ',';
|
---|
| 442 | jsn->expecting = '"';
|
---|
| 443 | goto GT_NEXT;
|
---|
| 444 |
|
---|
| 445 | /* new list or object */
|
---|
| 446 | /* hashes are more common */
|
---|
| 447 | case '{':
|
---|
| 448 | case '[':
|
---|
| 449 | INCR_METRIC(STRUCTURAL_TOKEN);
|
---|
| 450 | if (!jsn->can_insert) {
|
---|
| 451 | INVOKE_ERROR(CANT_INSERT);
|
---|
| 452 | }
|
---|
| 453 |
|
---|
| 454 | ENSURE_HVAL;
|
---|
| 455 | state->nelem++;
|
---|
| 456 |
|
---|
| 457 | STACK_PUSH;
|
---|
| 458 | /* because the constants match the opening delimiters, we can do this: */
|
---|
| 459 | state->type = CUR_CHAR;
|
---|
| 460 | state->nelem = 0;
|
---|
| 461 | jsn->can_insert = 1;
|
---|
| 462 | if (CUR_CHAR == '{') {
|
---|
| 463 | /* If we're a hash, we expect a key first, which is quouted */
|
---|
| 464 | jsn->expecting = '"';
|
---|
| 465 | }
|
---|
| 466 | if (CUR_CHAR == JSONSL_T_OBJECT) {
|
---|
| 467 | DO_CALLBACK(OBJECT, PUSH);
|
---|
| 468 | } else {
|
---|
| 469 | DO_CALLBACK(LIST, PUSH);
|
---|
| 470 | }
|
---|
| 471 | jsn->tok_last = 0;
|
---|
| 472 | goto GT_NEXT;
|
---|
| 473 |
|
---|
| 474 | /* closing of list or object */
|
---|
| 475 | case '}':
|
---|
| 476 | case ']':
|
---|
| 477 | INCR_METRIC(STRUCTURAL_TOKEN);
|
---|
| 478 | if (jsn->tok_last == ',' && jsn->options.allow_trailing_comma == 0) {
|
---|
| 479 | INVOKE_ERROR(TRAILING_COMMA);
|
---|
| 480 | }
|
---|
| 481 |
|
---|
| 482 | jsn->can_insert = 0;
|
---|
| 483 | jsn->level--;
|
---|
| 484 | jsn->expecting = ',';
|
---|
| 485 | jsn->tok_last = 0;
|
---|
| 486 | if (CUR_CHAR == ']') {
|
---|
| 487 | if (state->type != '[') {
|
---|
| 488 | INVOKE_ERROR(BRACKET_MISMATCH);
|
---|
| 489 | }
|
---|
| 490 | DO_CALLBACK(LIST, POP);
|
---|
| 491 | } else {
|
---|
| 492 | if (state->type != '{') {
|
---|
| 493 | INVOKE_ERROR(BRACKET_MISMATCH);
|
---|
| 494 | }
|
---|
| 495 | DO_CALLBACK(OBJECT, POP);
|
---|
| 496 | }
|
---|
| 497 | state = jsn->stack + jsn->level;
|
---|
| 498 | state->pos_cur = jsn->pos;
|
---|
| 499 | goto GT_NEXT;
|
---|
| 500 |
|
---|
| 501 | default:
|
---|
| 502 | GT_SPECIAL_BEGIN:
|
---|
| 503 | /**
|
---|
| 504 | * Not a string, not a structural token, and not benign whitespace.
|
---|
| 505 | * Technically we should iterate over the character always, but since
|
---|
| 506 | * we are not doing full numerical/value decoding anyway (but only hinting),
|
---|
| 507 | * we only check upon entry.
|
---|
| 508 | */
|
---|
| 509 | if (state->type != JSONSL_T_SPECIAL) {
|
---|
| 510 | int special_flags = extract_special(CUR_CHAR);
|
---|
| 511 | if (!special_flags) {
|
---|
| 512 | /**
|
---|
| 513 | * Try to do some heuristics here anyway to figure out what kind of
|
---|
| 514 | * error this is. The 'special' case is a fallback scenario anyway.
|
---|
| 515 | */
|
---|
| 516 | if (CUR_CHAR == '\0') {
|
---|
| 517 | INVOKE_ERROR(FOUND_NULL_BYTE);
|
---|
| 518 | } else if (CUR_CHAR < 0x20) {
|
---|
| 519 | INVOKE_ERROR(WEIRD_WHITESPACE);
|
---|
| 520 | } else {
|
---|
| 521 | INVOKE_ERROR(SPECIAL_EXPECTED);
|
---|
| 522 | }
|
---|
| 523 | }
|
---|
| 524 | ENSURE_HVAL;
|
---|
| 525 | state->nelem++;
|
---|
| 526 | if (!jsn->can_insert) {
|
---|
| 527 | INVOKE_ERROR(CANT_INSERT);
|
---|
| 528 | }
|
---|
| 529 | STACK_PUSH;
|
---|
| 530 | state->type = JSONSL_T_SPECIAL;
|
---|
| 531 | state->special_flags = special_flags;
|
---|
| 532 | if (special_flags == JSONSL_SPECIALf_UNSIGNED) {
|
---|
| 533 | state->nelem = CUR_CHAR - 0x30;
|
---|
| 534 | } else {
|
---|
| 535 | state->nelem = 0;
|
---|
| 536 | }
|
---|
| 537 | DO_CALLBACK(SPECIAL, PUSH);
|
---|
| 538 | }
|
---|
| 539 | goto GT_NEXT;
|
---|
| 540 | }
|
---|
| 541 |
|
---|
| 542 | GT_NEXT:
|
---|
| 543 | continue;
|
---|
| 544 | }
|
---|
| 545 | }
|
---|
| 546 |
|
---|
| 547 | JSONSL_API
|
---|
| 548 | const char* jsonsl_strerror(jsonsl_error_t err)
|
---|
| 549 | {
|
---|
| 550 | if (err == JSONSL_ERROR_SUCCESS) {
|
---|
| 551 | return "SUCCESS";
|
---|
| 552 | }
|
---|
| 553 | #define X(t) \
|
---|
| 554 | if (err == JSONSL_ERROR_##t) \
|
---|
| 555 | return #t;
|
---|
| 556 | JSONSL_XERR;
|
---|
| 557 | #undef X
|
---|
| 558 | return "<UNKNOWN_ERROR>";
|
---|
| 559 | }
|
---|
| 560 |
|
---|
| 561 | JSONSL_API
|
---|
| 562 | const char *jsonsl_strtype(jsonsl_type_t type)
|
---|
| 563 | {
|
---|
| 564 | #define X(o,c) \
|
---|
| 565 | if (type == JSONSL_T_##o) \
|
---|
| 566 | return #o;
|
---|
| 567 | JSONSL_XTYPE
|
---|
| 568 | #undef X
|
---|
| 569 | return "UNKNOWN TYPE";
|
---|
| 570 |
|
---|
| 571 | }
|
---|
| 572 |
|
---|
| 573 | /*
|
---|
| 574 | *
|
---|
| 575 | * JPR/JSONPointer functions
|
---|
| 576 | *
|
---|
| 577 | *
|
---|
| 578 | */
|
---|
| 579 | #ifndef JSONSL_NO_JPR
|
---|
| 580 | static
|
---|
| 581 | jsonsl_jpr_type_t
|
---|
| 582 | populate_component(char *in,
|
---|
| 583 | struct jsonsl_jpr_component_st *component,
|
---|
| 584 | char **next,
|
---|
| 585 | jsonsl_error_t *errp)
|
---|
| 586 | {
|
---|
| 587 | unsigned long pctval;
|
---|
| 588 | char *c = NULL, *outp = NULL, *end = NULL;
|
---|
| 589 | size_t input_len;
|
---|
| 590 | jsonsl_jpr_type_t ret = JSONSL_PATH_NONE;
|
---|
| 591 |
|
---|
| 592 | if (*next == NULL || *(*next) == '\0') {
|
---|
| 593 | return JSONSL_PATH_NONE;
|
---|
| 594 | }
|
---|
| 595 |
|
---|
| 596 | /* Replace the next / with a NULL */
|
---|
| 597 | *next = strstr(in, "/");
|
---|
| 598 | if (*next != NULL) {
|
---|
| 599 | *(*next) = '\0'; /* drop the forward slash */
|
---|
| 600 | input_len = *next - in;
|
---|
| 601 | end = *next;
|
---|
| 602 | *next += 1; /* next character after the '/' */
|
---|
| 603 | } else {
|
---|
| 604 | input_len = strlen(in);
|
---|
| 605 | end = in + input_len + 1;
|
---|
| 606 | }
|
---|
| 607 |
|
---|
| 608 | component->pstr = in;
|
---|
| 609 |
|
---|
| 610 | /* Check for special components of interest */
|
---|
| 611 | if (*in == JSONSL_PATH_WILDCARD_CHAR && input_len == 1) {
|
---|
| 612 | /* Lone wildcard */
|
---|
| 613 | ret = JSONSL_PATH_WILDCARD;
|
---|
| 614 | goto GT_RET;
|
---|
| 615 | } else if (isdigit(*in)) {
|
---|
| 616 | /* ASCII Numeric */
|
---|
| 617 | char *endptr;
|
---|
| 618 | component->idx = strtoul(in, &endptr, 10);
|
---|
| 619 | if (endptr && *endptr == '\0') {
|
---|
| 620 | ret = JSONSL_PATH_NUMERIC;
|
---|
| 621 | goto GT_RET;
|
---|
| 622 | }
|
---|
| 623 | }
|
---|
| 624 |
|
---|
| 625 | /* Default, it's a string */
|
---|
| 626 | ret = JSONSL_PATH_STRING;
|
---|
| 627 | for (c = outp = in; c < end; c++, outp++) {
|
---|
| 628 | char origc;
|
---|
| 629 | if (*c != '%') {
|
---|
| 630 | goto GT_ASSIGN;
|
---|
| 631 | }
|
---|
| 632 | /*
|
---|
| 633 | * c = { [+0] = '%', [+1] = 'b', [+2] = 'e', [+3] = '\0' }
|
---|
| 634 | */
|
---|
| 635 |
|
---|
| 636 | /* Need %XX */
|
---|
| 637 | if (c+2 >= end) {
|
---|
| 638 | *errp = JSONSL_ERROR_PERCENT_BADHEX;
|
---|
| 639 | return JSONSL_PATH_INVALID;
|
---|
| 640 | }
|
---|
| 641 | if (! (isxdigit(*(c+1)) && isxdigit(*(c+2))) ) {
|
---|
| 642 | *errp = JSONSL_ERROR_PERCENT_BADHEX;
|
---|
| 643 | return JSONSL_PATH_INVALID;
|
---|
| 644 | }
|
---|
| 645 |
|
---|
| 646 | /* Temporarily null-terminate the characters */
|
---|
| 647 | origc = *(c+3);
|
---|
| 648 | *(c+3) = '\0';
|
---|
| 649 | pctval = strtoul(c+1, NULL, 16);
|
---|
| 650 | *(c+3) = origc;
|
---|
| 651 |
|
---|
| 652 | *outp = (char) pctval;
|
---|
| 653 | c += 2;
|
---|
| 654 | continue;
|
---|
| 655 |
|
---|
| 656 | GT_ASSIGN:
|
---|
| 657 | *outp = *c;
|
---|
| 658 | }
|
---|
| 659 | /* Null-terminate the string */
|
---|
| 660 | for (; outp < c; outp++) {
|
---|
| 661 | *outp = '\0';
|
---|
| 662 | }
|
---|
| 663 |
|
---|
| 664 | GT_RET:
|
---|
| 665 | component->ptype = ret;
|
---|
| 666 | if (ret != JSONSL_PATH_WILDCARD) {
|
---|
| 667 | component->len = strlen(component->pstr);
|
---|
| 668 | }
|
---|
| 669 | return ret;
|
---|
| 670 | }
|
---|
| 671 |
|
---|
| 672 | JSONSL_API
|
---|
| 673 | jsonsl_jpr_t
|
---|
| 674 | jsonsl_jpr_new(const char *path, jsonsl_error_t *errp)
|
---|
| 675 | {
|
---|
| 676 | char *my_copy = NULL;
|
---|
| 677 | int count, curidx, len;
|
---|
| 678 | struct jsonsl_jpr_st *ret = NULL;
|
---|
| 679 | struct jsonsl_jpr_component_st *components = NULL;
|
---|
| 680 | size_t origlen;
|
---|
| 681 | jsonsl_error_t errstacked;
|
---|
| 682 |
|
---|
| 683 | #define JPR_BAIL(err) *errp = err; goto GT_ERROR;
|
---|
| 684 |
|
---|
| 685 | if (errp == NULL) {
|
---|
| 686 | errp = &errstacked;
|
---|
| 687 | }
|
---|
| 688 |
|
---|
| 689 | if (path == NULL || *path != '/') {
|
---|
| 690 | JPR_BAIL(JSONSL_ERROR_JPR_NOROOT);
|
---|
| 691 | return NULL;
|
---|
| 692 | }
|
---|
| 693 |
|
---|
| 694 | count = 1;
|
---|
| 695 | path++;
|
---|
| 696 | {
|
---|
| 697 | const char *c = path;
|
---|
| 698 | for (; *c; c++) {
|
---|
| 699 | if (*c == '/') {
|
---|
| 700 | count++;
|
---|
| 701 | if (*(c+1) == '/') {
|
---|
| 702 | JPR_BAIL(JSONSL_ERROR_JPR_DUPSLASH);
|
---|
| 703 | }
|
---|
| 704 | }
|
---|
| 705 | }
|
---|
| 706 | }
|
---|
| 707 | if(*path) {
|
---|
| 708 | count++;
|
---|
| 709 | }
|
---|
| 710 |
|
---|
| 711 | components = (struct jsonsl_jpr_component_st *)
|
---|
| 712 | malloc(sizeof(*components) * count);
|
---|
| 713 | if (!components) {
|
---|
| 714 | JPR_BAIL(JSONSL_ERROR_ENOMEM);
|
---|
| 715 | }
|
---|
| 716 |
|
---|
| 717 | len = strlen(path) + 1;
|
---|
| 718 | my_copy = (char *)malloc(len);
|
---|
| 719 | if (!my_copy) {
|
---|
| 720 | JPR_BAIL(JSONSL_ERROR_ENOMEM);
|
---|
| 721 | }
|
---|
| 722 |
|
---|
| 723 | strcpy_s(my_copy, len, path);
|
---|
| 724 |
|
---|
| 725 | components[0].ptype = JSONSL_PATH_ROOT;
|
---|
| 726 |
|
---|
| 727 | if (*my_copy) {
|
---|
| 728 | char *cur = my_copy;
|
---|
| 729 | int pathret = JSONSL_PATH_STRING;
|
---|
| 730 | curidx = 1;
|
---|
| 731 | while (pathret > 0 && curidx < count) {
|
---|
| 732 | pathret = populate_component(cur, components + curidx, &cur, errp);
|
---|
| 733 | if (pathret > 0) {
|
---|
| 734 | curidx++;
|
---|
| 735 | } else {
|
---|
| 736 | break;
|
---|
| 737 | }
|
---|
| 738 | }
|
---|
| 739 |
|
---|
| 740 | if (pathret == JSONSL_PATH_INVALID) {
|
---|
| 741 | JPR_BAIL(JSONSL_ERROR_JPR_BADPATH);
|
---|
| 742 | }
|
---|
| 743 | } else {
|
---|
| 744 | curidx = 1;
|
---|
| 745 | }
|
---|
| 746 |
|
---|
| 747 | path--; /*revert path to leading '/' */
|
---|
| 748 | origlen = strlen(path) + 1;
|
---|
| 749 | ret = (struct jsonsl_jpr_st *)malloc(sizeof(*ret));
|
---|
| 750 | if (!ret) {
|
---|
| 751 | JPR_BAIL(JSONSL_ERROR_ENOMEM);
|
---|
| 752 | }
|
---|
| 753 | ret->orig = (char *)malloc(origlen);
|
---|
| 754 | if (!ret->orig) {
|
---|
| 755 | JPR_BAIL(JSONSL_ERROR_ENOMEM);
|
---|
| 756 | }
|
---|
| 757 | ret->components = components;
|
---|
| 758 | ret->ncomponents = curidx;
|
---|
| 759 | ret->basestr = my_copy;
|
---|
| 760 | ret->norig = origlen-1;
|
---|
| 761 | strcpy_s(ret->orig, origlen, path);
|
---|
| 762 |
|
---|
| 763 | return ret;
|
---|
| 764 |
|
---|
| 765 | GT_ERROR:
|
---|
| 766 | free(my_copy);
|
---|
| 767 | free(components);
|
---|
| 768 | if (ret) {
|
---|
| 769 | free(ret->orig);
|
---|
| 770 | }
|
---|
| 771 | free(ret);
|
---|
| 772 | return NULL;
|
---|
| 773 | #undef JPR_BAIL
|
---|
| 774 | }
|
---|
| 775 |
|
---|
| 776 | void jsonsl_jpr_destroy(jsonsl_jpr_t jpr)
|
---|
| 777 | {
|
---|
| 778 | free(jpr->components);
|
---|
| 779 | free(jpr->basestr);
|
---|
| 780 | free(jpr->orig);
|
---|
| 781 | free(jpr);
|
---|
| 782 | }
|
---|
| 783 |
|
---|
| 784 | JSONSL_API
|
---|
| 785 | jsonsl_jpr_match_t
|
---|
| 786 | jsonsl_jpr_match(jsonsl_jpr_t jpr,
|
---|
| 787 | unsigned int parent_type,
|
---|
| 788 | unsigned int parent_level,
|
---|
| 789 | const char *key,
|
---|
| 790 | size_t nkey)
|
---|
| 791 | {
|
---|
| 792 | /* find our current component. This is the child level */
|
---|
| 793 | int cmpret;
|
---|
| 794 | struct jsonsl_jpr_component_st *p_component;
|
---|
| 795 | p_component = jpr->components + parent_level;
|
---|
| 796 |
|
---|
| 797 | if (parent_level >= jpr->ncomponents) {
|
---|
| 798 | return JSONSL_MATCH_NOMATCH;
|
---|
| 799 | }
|
---|
| 800 |
|
---|
| 801 | /* Lone query for 'root' element. Always matches */
|
---|
| 802 | if (parent_level == 0) {
|
---|
| 803 | if (jpr->ncomponents == 1) {
|
---|
| 804 | return JSONSL_MATCH_COMPLETE;
|
---|
| 805 | } else {
|
---|
| 806 | return JSONSL_MATCH_POSSIBLE;
|
---|
| 807 | }
|
---|
| 808 | }
|
---|
| 809 |
|
---|
| 810 | /* Wildcard, always matches */
|
---|
| 811 | if (p_component->ptype == JSONSL_PATH_WILDCARD) {
|
---|
| 812 | if (parent_level == jpr->ncomponents-1) {
|
---|
| 813 | return JSONSL_MATCH_COMPLETE;
|
---|
| 814 | } else {
|
---|
| 815 | return JSONSL_MATCH_POSSIBLE;
|
---|
| 816 | }
|
---|
| 817 | }
|
---|
| 818 |
|
---|
| 819 | /* Check numeric array index. This gets its special block so we can avoid
|
---|
| 820 | * string comparisons */
|
---|
| 821 | if (p_component->ptype == JSONSL_PATH_NUMERIC) {
|
---|
| 822 | if (parent_type == JSONSL_T_LIST) {
|
---|
| 823 | if (p_component->idx != nkey) {
|
---|
| 824 | /* Wrong index */
|
---|
| 825 | return JSONSL_MATCH_NOMATCH;
|
---|
| 826 | } else {
|
---|
| 827 | if (parent_level == jpr->ncomponents-1) {
|
---|
| 828 | /* This is the last element of the path */
|
---|
| 829 | return JSONSL_MATCH_COMPLETE;
|
---|
| 830 | } else {
|
---|
| 831 | /* Intermediate element */
|
---|
| 832 | return JSONSL_MATCH_POSSIBLE;
|
---|
| 833 | }
|
---|
| 834 | }
|
---|
| 835 | } else if (p_component->is_arridx) {
|
---|
| 836 | /* Numeric and an array index (set explicitly by user). But not
|
---|
| 837 | * a list for a parent */
|
---|
| 838 | return JSONSL_MATCH_TYPE_MISMATCH;
|
---|
| 839 | }
|
---|
| 840 | }
|
---|
| 841 |
|
---|
| 842 | /* Check lengths */
|
---|
| 843 | if (p_component->len != nkey) {
|
---|
| 844 | return JSONSL_MATCH_NOMATCH;
|
---|
| 845 | }
|
---|
| 846 |
|
---|
| 847 | /* Check string comparison */
|
---|
| 848 | cmpret = strncmp(p_component->pstr, key, nkey);
|
---|
| 849 | if (cmpret == 0) {
|
---|
| 850 | if (parent_level == jpr->ncomponents-1) {
|
---|
| 851 | return JSONSL_MATCH_COMPLETE;
|
---|
| 852 | } else {
|
---|
| 853 | return JSONSL_MATCH_POSSIBLE;
|
---|
| 854 | }
|
---|
| 855 | }
|
---|
| 856 |
|
---|
| 857 | return JSONSL_MATCH_NOMATCH;
|
---|
| 858 | }
|
---|
| 859 |
|
---|
| 860 | JSONSL_API
|
---|
| 861 | void jsonsl_jpr_match_state_init(jsonsl_t jsn,
|
---|
| 862 | jsonsl_jpr_t *jprs,
|
---|
| 863 | size_t njprs)
|
---|
| 864 | {
|
---|
| 865 | size_t ii, *firstjmp;
|
---|
| 866 | if (njprs == 0) {
|
---|
| 867 | return;
|
---|
| 868 | }
|
---|
| 869 | jsn->jprs = (jsonsl_jpr_t *)malloc(sizeof(jsonsl_jpr_t) * njprs);
|
---|
| 870 | jsn->jpr_count = njprs;
|
---|
| 871 | jsn->jpr_root = (size_t*)calloc(1, sizeof(size_t) * njprs * jsn->levels_max);
|
---|
| 872 | memcpy(jsn->jprs, jprs, sizeof(jsonsl_jpr_t) * njprs);
|
---|
| 873 | /* Set the initial jump table values */
|
---|
| 874 |
|
---|
| 875 | firstjmp = jsn->jpr_root;
|
---|
| 876 | for (ii = 0; ii < njprs; ii++) {
|
---|
| 877 | firstjmp[ii] = ii+1;
|
---|
| 878 | }
|
---|
| 879 | }
|
---|
| 880 |
|
---|
| 881 | JSONSL_API
|
---|
| 882 | void jsonsl_jpr_match_state_cleanup(jsonsl_t jsn)
|
---|
| 883 | {
|
---|
| 884 | if (jsn->jpr_count == 0) {
|
---|
| 885 | return;
|
---|
| 886 | }
|
---|
| 887 |
|
---|
| 888 | free(jsn->jpr_root);
|
---|
| 889 | free(jsn->jprs);
|
---|
| 890 | jsn->jprs = NULL;
|
---|
| 891 | jsn->jpr_root = NULL;
|
---|
| 892 | jsn->jpr_count = 0;
|
---|
| 893 | }
|
---|
| 894 |
|
---|
| 895 | /**
|
---|
| 896 | * This function should be called exactly once on each element...
|
---|
| 897 | * This should also be called in recursive order, since we rely
|
---|
| 898 | * on the parent having been initalized for a match.
|
---|
| 899 | *
|
---|
| 900 | * Since the parent is checked for a match as well, we maintain a 'serial' counter.
|
---|
| 901 | * Whenever we traverse an element, we expect the serial to be the same as a global
|
---|
| 902 | * integer. If they do not match, we re-initialize the context, and set the serial.
|
---|
| 903 | *
|
---|
| 904 | * This ensures a type of consistency without having a proactive reset by the
|
---|
| 905 | * main lexer itself.
|
---|
| 906 | *
|
---|
| 907 | */
|
---|
| 908 | JSONSL_API
|
---|
| 909 | jsonsl_jpr_t jsonsl_jpr_match_state(jsonsl_t jsn,
|
---|
| 910 | struct jsonsl_state_st *state,
|
---|
| 911 | const char *key,
|
---|
| 912 | size_t nkey,
|
---|
| 913 | jsonsl_jpr_match_t *out)
|
---|
| 914 | {
|
---|
| 915 | struct jsonsl_state_st *parent_state;
|
---|
| 916 | jsonsl_jpr_t ret = NULL;
|
---|
| 917 |
|
---|
| 918 | /* Jump and JPR tables for our own state and the parent state */
|
---|
| 919 | size_t *jmptable, *pjmptable;
|
---|
| 920 | size_t jmp_cur, ii, ourjmpidx;
|
---|
| 921 |
|
---|
| 922 | if (!jsn->jpr_root) {
|
---|
| 923 | *out = JSONSL_MATCH_NOMATCH;
|
---|
| 924 | return NULL;
|
---|
| 925 | }
|
---|
| 926 |
|
---|
| 927 | pjmptable = jsn->jpr_root + (jsn->jpr_count * (state->level-1));
|
---|
| 928 | jmptable = pjmptable + jsn->jpr_count;
|
---|
| 929 |
|
---|
| 930 | /* If the parent cannot match, then invalidate it */
|
---|
| 931 | if (*pjmptable == 0) {
|
---|
| 932 | *jmptable = 0;
|
---|
| 933 | *out = JSONSL_MATCH_NOMATCH;
|
---|
| 934 | return NULL;
|
---|
| 935 | }
|
---|
| 936 |
|
---|
| 937 | parent_state = jsn->stack + state->level - 1;
|
---|
| 938 |
|
---|
| 939 | if (parent_state->type == JSONSL_T_LIST) {
|
---|
| 940 | nkey = (size_t) parent_state->nelem;
|
---|
| 941 | }
|
---|
| 942 |
|
---|
| 943 | *jmptable = 0;
|
---|
| 944 | ourjmpidx = 0;
|
---|
| 945 | memset(jmptable, 0, sizeof(int) * jsn->jpr_count);
|
---|
| 946 |
|
---|
| 947 | for (ii = 0; ii < jsn->jpr_count; ii++) {
|
---|
| 948 | jmp_cur = pjmptable[ii];
|
---|
| 949 | if (jmp_cur) {
|
---|
| 950 | jsonsl_jpr_t jpr = jsn->jprs[jmp_cur-1];
|
---|
| 951 | *out = jsonsl_jpr_match(jpr,
|
---|
| 952 | parent_state->type,
|
---|
| 953 | parent_state->level,
|
---|
| 954 | key, nkey);
|
---|
| 955 | if (*out == JSONSL_MATCH_COMPLETE) {
|
---|
| 956 | ret = jpr;
|
---|
| 957 | *jmptable = 0;
|
---|
| 958 | return ret;
|
---|
| 959 | } else if (*out == JSONSL_MATCH_POSSIBLE) {
|
---|
| 960 | jmptable[ourjmpidx] = ii+1;
|
---|
| 961 | ourjmpidx++;
|
---|
| 962 | }
|
---|
| 963 | } else {
|
---|
| 964 | break;
|
---|
| 965 | }
|
---|
| 966 | }
|
---|
| 967 | if (!*jmptable) {
|
---|
| 968 | *out = JSONSL_MATCH_NOMATCH;
|
---|
| 969 | }
|
---|
| 970 | return NULL;
|
---|
| 971 | }
|
---|
| 972 |
|
---|
| 973 | JSONSL_API
|
---|
| 974 | const char *jsonsl_strmatchtype(jsonsl_jpr_match_t match)
|
---|
| 975 | {
|
---|
| 976 | #define X(T,v) \
|
---|
| 977 | if ( match == JSONSL_MATCH_##T ) \
|
---|
| 978 | return #T;
|
---|
| 979 | JSONSL_XMATCH
|
---|
| 980 | #undef X
|
---|
| 981 | return "<UNKNOWN>";
|
---|
| 982 | }
|
---|
| 983 |
|
---|
| 984 | #endif /* JSONSL_WITH_JPR */
|
---|
| 985 |
|
---|
| 986 | /**
|
---|
| 987 | * Utility function to convert escape sequences
|
---|
| 988 | */
|
---|
| 989 | JSONSL_API
|
---|
| 990 | size_t jsonsl_util_unescape_ex(const char *in,
|
---|
| 991 | char *out,
|
---|
| 992 | size_t len,
|
---|
| 993 | const int toEscape[128],
|
---|
| 994 | unsigned *oflags,
|
---|
| 995 | jsonsl_error_t *err,
|
---|
| 996 | const char **errat)
|
---|
| 997 | {
|
---|
| 998 | const unsigned char *c = (const unsigned char*)in;
|
---|
| 999 | int in_escape = 0;
|
---|
| 1000 | size_t origlen = len;
|
---|
| 1001 | /* difference between the length of the input buffer and the output buffer */
|
---|
| 1002 | size_t ndiff = 0;
|
---|
| 1003 | if (oflags) {
|
---|
| 1004 | *oflags = 0;
|
---|
| 1005 | }
|
---|
| 1006 | #define UNESCAPE_BAIL(e,offset) \
|
---|
| 1007 | *err = JSONSL_ERROR_##e; \
|
---|
| 1008 | if (errat) { \
|
---|
| 1009 | *errat = (const char*)(c+ (ptrdiff_t)(offset)); \
|
---|
| 1010 | } \
|
---|
| 1011 | return 0;
|
---|
| 1012 |
|
---|
| 1013 | for (; len; len--, c++, out++) {
|
---|
| 1014 | unsigned int uesc_val[2];
|
---|
| 1015 | if (in_escape) {
|
---|
| 1016 | /* inside a previously ignored escape. Ignore */
|
---|
| 1017 | in_escape = 0;
|
---|
| 1018 | goto GT_ASSIGN;
|
---|
| 1019 | }
|
---|
| 1020 |
|
---|
| 1021 | if (*c != '\\') {
|
---|
| 1022 | /* Not an escape, so we don't care about this */
|
---|
| 1023 | goto GT_ASSIGN;
|
---|
| 1024 | }
|
---|
| 1025 |
|
---|
| 1026 | if (len < 2) {
|
---|
| 1027 | UNESCAPE_BAIL(ESCAPE_INVALID, 0);
|
---|
| 1028 | }
|
---|
| 1029 | if (!is_allowed_escape(c[1])) {
|
---|
| 1030 | UNESCAPE_BAIL(ESCAPE_INVALID, 1)
|
---|
| 1031 | }
|
---|
| 1032 | if ((toEscape[(unsigned char)c[1] & 0x7f] == 0 &&
|
---|
| 1033 | c[1] != '\\' && c[1] != '"')) {
|
---|
| 1034 | /* if we don't want to unescape this string, just continue with
|
---|
| 1035 | * the escape flag set
|
---|
| 1036 | */
|
---|
| 1037 | in_escape = 1;
|
---|
| 1038 | goto GT_ASSIGN;
|
---|
| 1039 | }
|
---|
| 1040 |
|
---|
| 1041 | if (c[1] != 'u') {
|
---|
| 1042 | /* simple skip-and-replace using pre-defined maps.
|
---|
| 1043 | * TODO: should the maps actually reflect the desired
|
---|
| 1044 | * replacement character in toEscape?
|
---|
| 1045 | */
|
---|
| 1046 | char esctmp = get_escape_equiv(c[1]);
|
---|
| 1047 | if (esctmp) {
|
---|
| 1048 | /* Check if there is a corresponding replacement */
|
---|
| 1049 | *out = esctmp;
|
---|
| 1050 | } else {
|
---|
| 1051 | /* Just gobble up the 'reverse-solidus' */
|
---|
| 1052 | *out = c[1];
|
---|
| 1053 | }
|
---|
| 1054 | len--;
|
---|
| 1055 | ndiff++;
|
---|
| 1056 | c++;
|
---|
| 1057 | /* do not assign, just continue */
|
---|
| 1058 | continue;
|
---|
| 1059 | }
|
---|
| 1060 |
|
---|
| 1061 | /* next == 'u' */
|
---|
| 1062 | if (len < 6) {
|
---|
| 1063 | /* Need at least six characters:
|
---|
| 1064 | * { [0] = '\\', [1] = 'u', [2] = 'f', [3] = 'f', [4] = 'f', [5] = 'f' }
|
---|
| 1065 | */
|
---|
| 1066 | UNESCAPE_BAIL(UESCAPE_TOOSHORT, -1);
|
---|
| 1067 | }
|
---|
| 1068 |
|
---|
| 1069 | if (sscanf_s((const char*)(c+2), "%02x%02x", uesc_val, uesc_val+1) != 2) {
|
---|
| 1070 | /* We treat the sequence as two octets */
|
---|
| 1071 | UNESCAPE_BAIL(UESCAPE_TOOSHORT, -1);
|
---|
| 1072 | }
|
---|
| 1073 |
|
---|
| 1074 | /* By now, we gobble up all the six bytes (current implied + 5 next
|
---|
| 1075 | * characters), and have at least four missing bytes from the output
|
---|
| 1076 | * buffer.
|
---|
| 1077 | */
|
---|
| 1078 | len -= 5;
|
---|
| 1079 | c += 5;
|
---|
| 1080 |
|
---|
| 1081 | ndiff += 4;
|
---|
| 1082 | if (uesc_val[0] == 0) {
|
---|
| 1083 | /* only one byte is extracted from the two
|
---|
| 1084 | * possible octets. Increment the diff counter by one.
|
---|
| 1085 | */
|
---|
| 1086 | *out = uesc_val[1];
|
---|
| 1087 | if (oflags && *(unsigned char*)out > 0x7f) {
|
---|
| 1088 | *oflags |= JSONSL_SPECIALf_NONASCII;
|
---|
| 1089 | }
|
---|
| 1090 | ndiff++;
|
---|
| 1091 | } else {
|
---|
| 1092 | *(out++) = uesc_val[0];
|
---|
| 1093 | *out = uesc_val[1];
|
---|
| 1094 | if (oflags && (uesc_val[0] > 0x7f || uesc_val[1] > 0x7f)) {
|
---|
| 1095 | *oflags |= JSONSL_SPECIALf_NONASCII;
|
---|
| 1096 | }
|
---|
| 1097 | }
|
---|
| 1098 | continue;
|
---|
| 1099 |
|
---|
| 1100 | /* Only reached by previous branches */
|
---|
| 1101 | GT_ASSIGN:
|
---|
| 1102 | *out = *c;
|
---|
| 1103 | }
|
---|
| 1104 | *err = JSONSL_ERROR_SUCCESS;
|
---|
| 1105 | return origlen - ndiff;
|
---|
| 1106 | }
|
---|
| 1107 |
|
---|
| 1108 | /**
|
---|
| 1109 | * Character Table definitions.
|
---|
| 1110 | * These were all generated via srcutil/genchartables.pl
|
---|
| 1111 | */
|
---|
| 1112 |
|
---|
| 1113 | /**
|
---|
| 1114 | * This table contains the beginnings of non-string
|
---|
| 1115 | * allowable (bareword) values.
|
---|
| 1116 | */
|
---|
| 1117 | static unsigned short Special_Table[0x100] = {
|
---|
| 1118 | /* 0x00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
|
---|
| 1119 | /* 0x20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x2c */
|
---|
| 1120 | /* 0x2d */ JSONSL_SPECIALf_SIGNED /* - */, /* 0x2d */
|
---|
| 1121 | /* 0x2e */ 0,0, /* 0x2f */
|
---|
| 1122 | /* 0x30 */ JSONSL_SPECIALf_UNSIGNED /* 0 */, /* 0x30 */
|
---|
| 1123 | /* 0x31 */ JSONSL_SPECIALf_UNSIGNED /* 1 */, /* 0x31 */
|
---|
| 1124 | /* 0x32 */ JSONSL_SPECIALf_UNSIGNED /* 2 */, /* 0x32 */
|
---|
| 1125 | /* 0x33 */ JSONSL_SPECIALf_UNSIGNED /* 3 */, /* 0x33 */
|
---|
| 1126 | /* 0x34 */ JSONSL_SPECIALf_UNSIGNED /* 4 */, /* 0x34 */
|
---|
| 1127 | /* 0x35 */ JSONSL_SPECIALf_UNSIGNED /* 5 */, /* 0x35 */
|
---|
| 1128 | /* 0x36 */ JSONSL_SPECIALf_UNSIGNED /* 6 */, /* 0x36 */
|
---|
| 1129 | /* 0x37 */ JSONSL_SPECIALf_UNSIGNED /* 7 */, /* 0x37 */
|
---|
| 1130 | /* 0x38 */ JSONSL_SPECIALf_UNSIGNED /* 8 */, /* 0x38 */
|
---|
| 1131 | /* 0x39 */ JSONSL_SPECIALf_UNSIGNED /* 9 */, /* 0x39 */
|
---|
| 1132 | /* 0x3a */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x59 */
|
---|
| 1133 | /* 0x5a */ 0,0,0,0,0,0,0,0,0,0,0,0, /* 0x65 */
|
---|
| 1134 | /* 0x66 */ JSONSL_SPECIALf_FALSE /* f */, /* 0x66 */
|
---|
| 1135 | /* 0x67 */ 0,0,0,0,0,0,0, /* 0x6d */
|
---|
| 1136 | /* 0x6e */ JSONSL_SPECIALf_NULL /* n */, /* 0x6e */
|
---|
| 1137 | /* 0x6f */ 0,0,0,0,0, /* 0x73 */
|
---|
| 1138 | /* 0x74 */ JSONSL_SPECIALf_TRUE /* t */, /* 0x74 */
|
---|
| 1139 | /* 0x75 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x94 */
|
---|
| 1140 | /* 0x95 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb4 */
|
---|
| 1141 | /* 0xb5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xd4 */
|
---|
| 1142 | /* 0xd5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xf4 */
|
---|
| 1143 | /* 0xf5 */ 0,0,0,0,0,0,0,0,0,0 /* 0xfe */
|
---|
| 1144 | };
|
---|
| 1145 |
|
---|
| 1146 | /**
|
---|
| 1147 | * Contains characters which signal the termination of any of the 'special' bareword
|
---|
| 1148 | * values.
|
---|
| 1149 | */
|
---|
| 1150 | static int Special_Endings[0x100] = {
|
---|
| 1151 | /* 0x00 */ 0,0,0,0,0,0,0,0,0, /* 0x08 */
|
---|
| 1152 | /* 0x09 */ 1 /* <TAB> */, /* 0x09 */
|
---|
| 1153 | /* 0x0a */ 1 /* <LF> */, /* 0x0a */
|
---|
| 1154 | /* 0x0b */ 0,0, /* 0x0c */
|
---|
| 1155 | /* 0x0d */ 1 /* <CR> */, /* 0x0d */
|
---|
| 1156 | /* 0x0e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
|
---|
| 1157 | /* 0x20 */ 1 /* <SP> */, /* 0x20 */
|
---|
| 1158 | /* 0x21 */ 0, /* 0x21 */
|
---|
| 1159 | /* 0x22 */ 1 /* " */, /* 0x22 */
|
---|
| 1160 | /* 0x23 */ 0,0,0,0,0,0,0,0,0, /* 0x2b */
|
---|
| 1161 | /* 0x2c */ 1 /* , */, /* 0x2c */
|
---|
| 1162 | /* 0x2d */ 0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x39 */
|
---|
| 1163 | /* 0x3a */ 1 /* : */, /* 0x3a */
|
---|
| 1164 | /* 0x3b */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5a */
|
---|
| 1165 | /* 0x5b */ 1 /* [ */, /* 0x5b */
|
---|
| 1166 | /* 0x5c */ 1 /* \ */, /* 0x5c */
|
---|
| 1167 | /* 0x5d */ 1 /* ] */, /* 0x5d */
|
---|
| 1168 | /* 0x5e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x7a */
|
---|
| 1169 | /* 0x7b */ 1 /* { */, /* 0x7b */
|
---|
| 1170 | /* 0x7c */ 0, /* 0x7c */
|
---|
| 1171 | /* 0x7d */ 1 /* } */, /* 0x7d */
|
---|
| 1172 | /* 0x7e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x9d */
|
---|
| 1173 | /* 0x9e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xbd */
|
---|
| 1174 | /* 0xbe */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xdd */
|
---|
| 1175 | /* 0xde */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xfd */
|
---|
| 1176 | /* 0xfe */ 0 /* 0xfe */
|
---|
| 1177 | };
|
---|
| 1178 |
|
---|
| 1179 | /**
|
---|
| 1180 | * This table contains entries for the allowed whitespace as per RFC 4627
|
---|
| 1181 | */
|
---|
| 1182 | static int Allowed_Whitespace[0x100] = {
|
---|
| 1183 | /* 0x00 */ 0,0,0,0,0,0,0,0,0, /* 0x08 */
|
---|
| 1184 | /* 0x09 */ 1 /* <TAB> */, /* 0x09 */
|
---|
| 1185 | /* 0x0a */ 1 /* <LF> */, /* 0x0a */
|
---|
| 1186 | /* 0x0b */ 0,0, /* 0x0c */
|
---|
| 1187 | /* 0x0d */ 1 /* <CR> */, /* 0x0d */
|
---|
| 1188 | /* 0x0e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
|
---|
| 1189 | /* 0x20 */ 1 /* <SP> */, /* 0x20 */
|
---|
| 1190 | /* 0x21 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x40 */
|
---|
| 1191 | /* 0x41 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x60 */
|
---|
| 1192 | /* 0x61 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x80 */
|
---|
| 1193 | /* 0x81 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xa0 */
|
---|
| 1194 | /* 0xa1 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xc0 */
|
---|
| 1195 | /* 0xc1 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xe0 */
|
---|
| 1196 | /* 0xe1 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* 0xfe */
|
---|
| 1197 | };
|
---|
| 1198 |
|
---|
| 1199 | /**
|
---|
| 1200 | * Allowable two-character 'common' escapes:
|
---|
| 1201 | */
|
---|
| 1202 | static int Allowed_Escapes[0x100] = {
|
---|
| 1203 | /* 0x00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
|
---|
| 1204 | /* 0x20 */ 0,0, /* 0x21 */
|
---|
| 1205 | /* 0x22 */ 1 /* <"> */, /* 0x22 */
|
---|
| 1206 | /* 0x23 */ 0,0,0,0,0,0,0,0,0,0,0,0, /* 0x2e */
|
---|
| 1207 | /* 0x2f */ 1 /* </> */, /* 0x2f */
|
---|
| 1208 | /* 0x30 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x4f */
|
---|
| 1209 | /* 0x50 */ 0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5b */
|
---|
| 1210 | /* 0x5c */ 1 /* <\> */, /* 0x5c */
|
---|
| 1211 | /* 0x5d */ 0,0,0,0,0, /* 0x61 */
|
---|
| 1212 | /* 0x62 */ 1 /* <b> */, /* 0x62 */
|
---|
| 1213 | /* 0x63 */ 0,0,0, /* 0x65 */
|
---|
| 1214 | /* 0x66 */ 1 /* <f> */, /* 0x66 */
|
---|
| 1215 | /* 0x67 */ 0,0,0,0,0,0,0, /* 0x6d */
|
---|
| 1216 | /* 0x6e */ 1 /* <n> */, /* 0x6e */
|
---|
| 1217 | /* 0x6f */ 0,0,0, /* 0x71 */
|
---|
| 1218 | /* 0x72 */ 1 /* <r> */, /* 0x72 */
|
---|
| 1219 | /* 0x73 */ 0, /* 0x73 */
|
---|
| 1220 | /* 0x74 */ 1 /* <t> */, /* 0x74 */
|
---|
| 1221 | /* 0x75 */ 1 /* <u> */, /* 0x75 */
|
---|
| 1222 | /* 0x76 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x95 */
|
---|
| 1223 | /* 0x96 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb5 */
|
---|
| 1224 | /* 0xb6 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xd5 */
|
---|
| 1225 | /* 0xd6 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xf5 */
|
---|
| 1226 | /* 0xf6 */ 0,0,0,0,0,0,0,0,0, /* 0xfe */
|
---|
| 1227 | };
|
---|
| 1228 |
|
---|
| 1229 | /**
|
---|
| 1230 | * This table contains the _values_ for a given (single) escaped character.
|
---|
| 1231 | */
|
---|
| 1232 | static unsigned char Escape_Equivs[0x100] = {
|
---|
| 1233 | /* 0x00 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x1f */
|
---|
| 1234 | /* 0x20 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x3f */
|
---|
| 1235 | /* 0x40 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x5f */
|
---|
| 1236 | /* 0x60 */ 0,0, /* 0x61 */
|
---|
| 1237 | /* 0x62 */ 8 /* <b> */, /* 0x62 */
|
---|
| 1238 | /* 0x63 */ 0,0,0, /* 0x65 */
|
---|
| 1239 | /* 0x66 */ 12 /* <f> */, /* 0x66 */
|
---|
| 1240 | /* 0x67 */ 0,0,0,0,0,0,0, /* 0x6d */
|
---|
| 1241 | /* 0x6e */ 10 /* <n> */, /* 0x6e */
|
---|
| 1242 | /* 0x6f */ 0,0,0, /* 0x71 */
|
---|
| 1243 | /* 0x72 */ 13 /* <r> */, /* 0x72 */
|
---|
| 1244 | /* 0x73 */ 0, /* 0x73 */
|
---|
| 1245 | /* 0x74 */ 9 /* <t> */, /* 0x74 */
|
---|
| 1246 | /* 0x75 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x94 */
|
---|
| 1247 | /* 0x95 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xb4 */
|
---|
| 1248 | /* 0xb5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xd4 */
|
---|
| 1249 | /* 0xd5 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0xf4 */
|
---|
| 1250 | /* 0xf5 */ 0,0,0,0,0,0,0,0,0,0 /* 0xfe */
|
---|
| 1251 | };
|
---|
| 1252 |
|
---|
| 1253 | /* Definitions of above-declared static functions */
|
---|
| 1254 | static char get_escape_equiv(unsigned c) {
|
---|
| 1255 | return Escape_Equivs[c & 0xff];
|
---|
| 1256 | }
|
---|
| 1257 | static unsigned extract_special(unsigned c) {
|
---|
| 1258 | return Special_Table[c & 0xff];
|
---|
| 1259 | }
|
---|
| 1260 | static int is_special_end(unsigned c) {
|
---|
| 1261 | return Special_Endings[c & 0xff];
|
---|
| 1262 | }
|
---|
| 1263 | static int is_allowed_whitespace(unsigned c) {
|
---|
| 1264 | return c == ' ' || Allowed_Whitespace[c & 0xff];
|
---|
| 1265 | }
|
---|
| 1266 | static int is_allowed_escape(unsigned c) {
|
---|
| 1267 | return Allowed_Escapes[c & 0xff];
|
---|
| 1268 | }
|
---|