summaryrefslogtreecommitdiff
path: root/decoder/JSON_parser.c
diff options
context:
space:
mode:
Diffstat (limited to 'decoder/JSON_parser.c')
-rw-r--r--decoder/JSON_parser.c1012
1 files changed, 1012 insertions, 0 deletions
diff --git a/decoder/JSON_parser.c b/decoder/JSON_parser.c
new file mode 100644
index 00000000..175b7cc9
--- /dev/null
+++ b/decoder/JSON_parser.c
@@ -0,0 +1,1012 @@
+/* JSON_parser.c */
+
+/* 2007-08-24 */
+
+/*
+Copyright (c) 2005 JSON.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+The Software shall be used for Good, not Evil.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+/*
+ Callbacks, comments, Unicode handling by Jean Gressmann (jean@0x42.de), 2007-2009.
+
+ For the added features the license above applies also.
+
+ Changelog:
+ 2009-05-17
+ Incorporated benrudiak@googlemail.com fix for UTF16 decoding.
+
+ 2009-05-14
+ Fixed float parsing bug related to a locale being set that didn't
+ use '.' as decimal point character (charles@transmissionbt.com).
+
+ 2008-10-14
+ Renamed states.IN to states.IT to avoid name clash which IN macro
+ defined in windef.h (alexey.pelykh@gmail.com)
+
+ 2008-07-19
+ Removed some duplicate code & debugging variable (charles@transmissionbt.com)
+
+ 2008-05-28
+ Made JSON_value structure ansi C compliant. This bug was report by
+ trisk@acm.jhu.edu
+
+ 2008-05-20
+ Fixed bug reported by charles@transmissionbt.com where the switching
+ from static to dynamic parse buffer did not copy the static parse
+ buffer's content.
+*/
+
+
+
+#include <assert.h>
+#include <ctype.h>
+#include <float.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <locale.h>
+
+#include "JSON_parser.h"
+
+#ifdef _MSC_VER
+# if _MSC_VER >= 1400 /* Visual Studio 2005 and up */
+# pragma warning(disable:4996) // unsecure sscanf
+# endif
+#endif
+
+
+#define true 1
+#define false 0
+#define __ -1 /* the universal error code */
+
+/* values chosen so that the object size is approx equal to one page (4K) */
+#ifndef JSON_PARSER_STACK_SIZE
+# define JSON_PARSER_STACK_SIZE 128
+#endif
+
+#ifndef JSON_PARSER_PARSE_BUFFER_SIZE
+# define JSON_PARSER_PARSE_BUFFER_SIZE 3500
+#endif
+
+typedef unsigned short UTF16;
+
+struct JSON_parser_struct {
+ JSON_parser_callback callback;
+ void* ctx;
+ signed char state, before_comment_state, type, escaped, comment, allow_comments, handle_floats_manually;
+ UTF16 utf16_high_surrogate;
+ long depth;
+ long top;
+ signed char* stack;
+ long stack_capacity;
+ char decimal_point;
+ char* parse_buffer;
+ size_t parse_buffer_capacity;
+ size_t parse_buffer_count;
+ size_t comment_begin_offset;
+ signed char static_stack[JSON_PARSER_STACK_SIZE];
+ char static_parse_buffer[JSON_PARSER_PARSE_BUFFER_SIZE];
+};
+
+#define COUNTOF(x) (sizeof(x)/sizeof(x[0]))
+
+/*
+ Characters are mapped into these character classes. This allows for
+ a significant reduction in the size of the state transition table.
+*/
+
+
+
+enum classes {
+ C_SPACE, /* space */
+ C_WHITE, /* other whitespace */
+ C_LCURB, /* { */
+ C_RCURB, /* } */
+ C_LSQRB, /* [ */
+ C_RSQRB, /* ] */
+ C_COLON, /* : */
+ C_COMMA, /* , */
+ C_QUOTE, /* " */
+ C_BACKS, /* \ */
+ C_SLASH, /* / */
+ C_PLUS, /* + */
+ C_MINUS, /* - */
+ C_POINT, /* . */
+ C_ZERO , /* 0 */
+ C_DIGIT, /* 123456789 */
+ C_LOW_A, /* a */
+ C_LOW_B, /* b */
+ C_LOW_C, /* c */
+ C_LOW_D, /* d */
+ C_LOW_E, /* e */
+ C_LOW_F, /* f */
+ C_LOW_L, /* l */
+ C_LOW_N, /* n */
+ C_LOW_R, /* r */
+ C_LOW_S, /* s */
+ C_LOW_T, /* t */
+ C_LOW_U, /* u */
+ C_ABCDF, /* ABCDF */
+ C_E, /* E */
+ C_ETC, /* everything else */
+ C_STAR, /* * */
+ NR_CLASSES
+};
+
+static int ascii_class[128] = {
+/*
+ This array maps the 128 ASCII characters into character classes.
+ The remaining Unicode characters should be mapped to C_ETC.
+ Non-whitespace control characters are errors.
+*/
+ __, __, __, __, __, __, __, __,
+ __, C_WHITE, C_WHITE, __, __, C_WHITE, __, __,
+ __, __, __, __, __, __, __, __,
+ __, __, __, __, __, __, __, __,
+
+ C_SPACE, C_ETC, C_QUOTE, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
+ C_ETC, C_ETC, C_STAR, C_PLUS, C_COMMA, C_MINUS, C_POINT, C_SLASH,
+ C_ZERO, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT,
+ C_DIGIT, C_DIGIT, C_COLON, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
+
+ C_ETC, C_ABCDF, C_ABCDF, C_ABCDF, C_ABCDF, C_E, C_ABCDF, C_ETC,
+ C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
+ C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
+ C_ETC, C_ETC, C_ETC, C_LSQRB, C_BACKS, C_RSQRB, C_ETC, C_ETC,
+
+ C_ETC, C_LOW_A, C_LOW_B, C_LOW_C, C_LOW_D, C_LOW_E, C_LOW_F, C_ETC,
+ C_ETC, C_ETC, C_ETC, C_ETC, C_LOW_L, C_ETC, C_LOW_N, C_ETC,
+ C_ETC, C_ETC, C_LOW_R, C_LOW_S, C_LOW_T, C_LOW_U, C_ETC, C_ETC,
+ C_ETC, C_ETC, C_ETC, C_LCURB, C_ETC, C_RCURB, C_ETC, C_ETC
+};
+
+
+/*
+ The state codes.
+*/
+enum states {
+ GO, /* start */
+ OK, /* ok */
+ OB, /* object */
+ KE, /* key */
+ CO, /* colon */
+ VA, /* value */
+ AR, /* array */
+ ST, /* string */
+ ES, /* escape */
+ U1, /* u1 */
+ U2, /* u2 */
+ U3, /* u3 */
+ U4, /* u4 */
+ MI, /* minus */
+ ZE, /* zero */
+ IT, /* integer */
+ FR, /* fraction */
+ E1, /* e */
+ E2, /* ex */
+ E3, /* exp */
+ T1, /* tr */
+ T2, /* tru */
+ T3, /* true */
+ F1, /* fa */
+ F2, /* fal */
+ F3, /* fals */
+ F4, /* false */
+ N1, /* nu */
+ N2, /* nul */
+ N3, /* null */
+ C1, /* / */
+ C2, /* / * */
+ C3, /* * */
+ FX, /* *.* *eE* */
+ D1, /* second UTF-16 character decoding started by \ */
+ D2, /* second UTF-16 character proceeded by u */
+ NR_STATES
+};
+
+enum actions
+{
+ CB = -10, /* comment begin */
+ CE = -11, /* comment end */
+ FA = -12, /* false */
+ TR = -13, /* false */
+ NU = -14, /* null */
+ DE = -15, /* double detected by exponent e E */
+ DF = -16, /* double detected by fraction . */
+ SB = -17, /* string begin */
+ MX = -18, /* integer detected by minus */
+ ZX = -19, /* integer detected by zero */
+ IX = -20, /* integer detected by 1-9 */
+ EX = -21, /* next char is escaped */
+ UC = -22 /* Unicode character read */
+};
+
+
+static int state_transition_table[NR_STATES][NR_CLASSES] = {
+/*
+ The state transition table takes the current state and the current symbol,
+ and returns either a new state or an action. An action is represented as a
+ negative number. A JSON text is accepted if at the end of the text the
+ state is OK and if the mode is MODE_DONE.
+
+ white 1-9 ABCDF etc
+ space | { } [ ] : , " \ / + - . 0 | a b c d e f l n r s t u | E | * */
+/*start GO*/ {GO,GO,-6,__,-5,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*ok OK*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*object OB*/ {OB,OB,__,-9,__,__,__,__,SB,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*key KE*/ {KE,KE,__,__,__,__,__,__,SB,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*colon CO*/ {CO,CO,__,__,__,__,-2,__,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*value VA*/ {VA,VA,-6,__,-5,__,__,__,SB,__,CB,__,MX,__,ZX,IX,__,__,__,__,__,FA,__,NU,__,__,TR,__,__,__,__,__},
+/*array AR*/ {AR,AR,-6,__,-5,-7,__,__,SB,__,CB,__,MX,__,ZX,IX,__,__,__,__,__,FA,__,NU,__,__,TR,__,__,__,__,__},
+/*string ST*/ {ST,__,ST,ST,ST,ST,ST,ST,-4,EX,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST,ST},
+/*escape ES*/ {__,__,__,__,__,__,__,__,ST,ST,ST,__,__,__,__,__,__,ST,__,__,__,ST,__,ST,ST,__,ST,U1,__,__,__,__},
+/*u1 U1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,U2,U2,U2,U2,U2,U2,U2,U2,__,__,__,__,__,__,U2,U2,__,__},
+/*u2 U2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,U3,U3,U3,U3,U3,U3,U3,U3,__,__,__,__,__,__,U3,U3,__,__},
+/*u3 U3*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,U4,U4,U4,U4,U4,U4,U4,U4,__,__,__,__,__,__,U4,U4,__,__},
+/*u4 U4*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,UC,UC,UC,UC,UC,UC,UC,UC,__,__,__,__,__,__,UC,UC,__,__},
+/*minus MI*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,ZE,IT,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*zero ZE*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,DF,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*int IT*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,DF,IT,IT,__,__,__,__,DE,__,__,__,__,__,__,__,__,DE,__,__},
+/*frac FR*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,__,FR,FR,__,__,__,__,E1,__,__,__,__,__,__,__,__,E1,__,__},
+/*e E1*/ {__,__,__,__,__,__,__,__,__,__,__,E2,E2,__,E3,E3,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*ex E2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,E3,E3,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*exp E3*/ {OK,OK,__,-8,__,-7,__,-3,__,__,__,__,__,__,E3,E3,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*tr T1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,T2,__,__,__,__,__,__,__},
+/*tru T2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,T3,__,__,__,__},
+/*true T3*/ {__,__,__,__,__,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,OK,__,__,__,__,__,__,__,__,__,__,__},
+/*fa F1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,F2,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*fal F2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,F3,__,__,__,__,__,__,__,__,__},
+/*fals F3*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,F4,__,__,__,__,__,__},
+/*false F4*/ {__,__,__,__,__,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,OK,__,__,__,__,__,__,__,__,__,__,__},
+/*nu N1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,N2,__,__,__,__},
+/*nul N2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,N3,__,__,__,__,__,__,__,__,__},
+/*null N3*/ {__,__,__,__,__,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,OK,__,__,__,__,__,__,__,__,__},
+/*/ C1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,C2},
+/*/* C2*/ {C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C3},
+/** C3*/ {C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,CE,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C2,C3},
+/*_. FX*/ {OK,OK,__,-8,__,-7,__,-3,__,__,__,__,__,__,FR,FR,__,__,__,__,E1,__,__,__,__,__,__,__,__,E1,__,__},
+/*\ D1*/ {__,__,__,__,__,__,__,__,__,D2,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
+/*\ D2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,U1,__,__,__,__},
+};
+
+
+/*
+ These modes can be pushed on the stack.
+*/
+enum modes {
+ MODE_ARRAY = 1,
+ MODE_DONE = 2,
+ MODE_KEY = 3,
+ MODE_OBJECT = 4
+};
+
+static int
+push(JSON_parser jc, int mode)
+{
+/*
+ Push a mode onto the stack. Return false if there is overflow.
+*/
+ jc->top += 1;
+ if (jc->depth < 0) {
+ if (jc->top >= jc->stack_capacity) {
+ size_t bytes_to_allocate;
+ jc->stack_capacity *= 2;
+ bytes_to_allocate = jc->stack_capacity * sizeof(jc->static_stack[0]);
+ if (jc->stack == &jc->static_stack[0]) {
+ jc->stack = (signed char*)malloc(bytes_to_allocate);
+ memcpy(jc->stack, jc->static_stack, sizeof(jc->static_stack));
+ } else {
+ jc->stack = (signed char*)realloc(jc->stack, bytes_to_allocate);
+ }
+ }
+ } else {
+ if (jc->top >= jc->depth) {
+ return false;
+ }
+ }
+
+ jc->stack[jc->top] = mode;
+ return true;
+}
+
+
+static int
+pop(JSON_parser jc, int mode)
+{
+/*
+ Pop the stack, assuring that the current mode matches the expectation.
+ Return false if there is underflow or if the modes mismatch.
+*/
+ if (jc->top < 0 || jc->stack[jc->top] != mode) {
+ return false;
+ }
+ jc->top -= 1;
+ return true;
+}
+
+
+#define parse_buffer_clear(jc) \
+ do {\
+ jc->parse_buffer_count = 0;\
+ jc->parse_buffer[0] = 0;\
+ } while (0)
+
+#define parse_buffer_pop_back_char(jc)\
+ do {\
+ assert(jc->parse_buffer_count >= 1);\
+ --jc->parse_buffer_count;\
+ jc->parse_buffer[jc->parse_buffer_count] = 0;\
+ } while (0)
+
+void delete_JSON_parser(JSON_parser jc)
+{
+ if (jc) {
+ if (jc->stack != &jc->static_stack[0]) {
+ free((void*)jc->stack);
+ }
+ if (jc->parse_buffer != &jc->static_parse_buffer[0]) {
+ free((void*)jc->parse_buffer);
+ }
+ free((void*)jc);
+ }
+}
+
+
+JSON_parser
+new_JSON_parser(JSON_config* config)
+{
+/*
+ new_JSON_parser starts the checking process by constructing a JSON_parser
+ object. It takes a depth parameter that restricts the level of maximum
+ nesting.
+
+ To continue the process, call JSON_parser_char for each character in the
+ JSON text, and then call JSON_parser_done to obtain the final result.
+ These functions are fully reentrant.
+*/
+
+ int depth = 0;
+ JSON_config default_config;
+
+ JSON_parser jc = (JSON_parser)malloc(sizeof(struct JSON_parser_struct));
+
+ memset(jc, 0, sizeof(*jc));
+
+
+ /* initialize configuration */
+ init_JSON_config(&default_config);
+
+ /* set to default configuration if none was provided */
+ if (config == NULL) {
+ config = &default_config;
+ }
+
+ depth = config->depth;
+
+ /* We need to be able to push at least one object */
+ if (depth == 0) {
+ depth = 1;
+ }
+
+ jc->state = GO;
+ jc->top = -1;
+
+ /* Do we want non-bound stack? */
+ if (depth > 0) {
+ jc->stack_capacity = depth;
+ jc->depth = depth;
+ if (depth <= (int)COUNTOF(jc->static_stack)) {
+ jc->stack = &jc->static_stack[0];
+ } else {
+ jc->stack = (signed char*)malloc(jc->stack_capacity * sizeof(jc->static_stack[0]));
+ }
+ } else {
+ jc->stack_capacity = COUNTOF(jc->static_stack);
+ jc->depth = -1;
+ jc->stack = &jc->static_stack[0];
+ }
+
+ /* set parser to start */
+ push(jc, MODE_DONE);
+
+ /* set up the parse buffer */
+ jc->parse_buffer = &jc->static_parse_buffer[0];
+ jc->parse_buffer_capacity = COUNTOF(jc->static_parse_buffer);
+ parse_buffer_clear(jc);
+
+ /* set up callback, comment & float handling */
+ jc->callback = config->callback;
+ jc->ctx = config->callback_ctx;
+ jc->allow_comments = config->allow_comments != 0;
+ jc->handle_floats_manually = config->handle_floats_manually != 0;
+
+ /* set up decimal point */
+ jc->decimal_point = *localeconv()->decimal_point;
+
+ return jc;
+}
+
+static void grow_parse_buffer(JSON_parser jc)
+{
+ size_t bytes_to_allocate;
+ jc->parse_buffer_capacity *= 2;
+ bytes_to_allocate = jc->parse_buffer_capacity * sizeof(jc->parse_buffer[0]);
+ if (jc->parse_buffer == &jc->static_parse_buffer[0]) {
+ jc->parse_buffer = (char*)malloc(bytes_to_allocate);
+ memcpy(jc->parse_buffer, jc->static_parse_buffer, jc->parse_buffer_count);
+ } else {
+ jc->parse_buffer = (char*)realloc(jc->parse_buffer, bytes_to_allocate);
+ }
+}
+
+#define parse_buffer_push_back_char(jc, c)\
+ do {\
+ if (jc->parse_buffer_count + 1 >= jc->parse_buffer_capacity) grow_parse_buffer(jc);\
+ jc->parse_buffer[jc->parse_buffer_count++] = c;\
+ jc->parse_buffer[jc->parse_buffer_count] = 0;\
+ } while (0)
+
+#define assert_is_non_container_type(jc) \
+ assert( \
+ jc->type == JSON_T_NULL || \
+ jc->type == JSON_T_FALSE || \
+ jc->type == JSON_T_TRUE || \
+ jc->type == JSON_T_FLOAT || \
+ jc->type == JSON_T_INTEGER || \
+ jc->type == JSON_T_STRING)
+
+
+static int parse_parse_buffer(JSON_parser jc)
+{
+ if (jc->callback) {
+ JSON_value value, *arg = NULL;
+
+ if (jc->type != JSON_T_NONE) {
+ assert_is_non_container_type(jc);
+
+ switch(jc->type) {
+ case JSON_T_FLOAT:
+ arg = &value;
+ if (jc->handle_floats_manually) {
+ value.vu.str.value = jc->parse_buffer;
+ value.vu.str.length = jc->parse_buffer_count;
+ } else {
+ /*sscanf(jc->parse_buffer, "%Lf", &value.vu.float_value);*/
+
+ /* not checking with end pointer b/c there may be trailing ws */
+ value.vu.float_value = strtold(jc->parse_buffer, NULL);
+ }
+ break;
+ case JSON_T_INTEGER:
+ arg = &value;
+ sscanf(jc->parse_buffer, JSON_PARSER_INTEGER_SSCANF_TOKEN, &value.vu.integer_value);
+ break;
+ case JSON_T_STRING:
+ arg = &value;
+ value.vu.str.value = jc->parse_buffer;
+ value.vu.str.length = jc->parse_buffer_count;
+ break;
+ }
+
+ if (!(*jc->callback)(jc->ctx, jc->type, arg)) {
+ return false;
+ }
+ }
+ }
+
+ parse_buffer_clear(jc);
+
+ return true;
+}
+
+#define IS_HIGH_SURROGATE(uc) (((uc) & 0xFC00) == 0xD800)
+#define IS_LOW_SURROGATE(uc) (((uc) & 0xFC00) == 0xDC00)
+#define DECODE_SURROGATE_PAIR(hi,lo) ((((hi) & 0x3FF) << 10) + ((lo) & 0x3FF) + 0x10000)
+static unsigned char utf8_lead_bits[4] = { 0x00, 0xC0, 0xE0, 0xF0 };
+
+static int decode_unicode_char(JSON_parser jc)
+{
+ int i;
+ unsigned uc = 0;
+ char* p;
+ int trail_bytes;
+
+ assert(jc->parse_buffer_count >= 6);
+
+ p = &jc->parse_buffer[jc->parse_buffer_count - 4];
+
+ for (i = 12; i >= 0; i -= 4, ++p) {
+ unsigned x = *p;
+
+ if (x >= 'a') {
+ x -= ('a' - 10);
+ } else if (x >= 'A') {
+ x -= ('A' - 10);
+ } else {
+ x &= ~0x30u;
+ }
+
+ assert(x < 16);
+
+ uc |= x << i;
+ }
+
+ /* clear UTF-16 char from buffer */
+ jc->parse_buffer_count -= 6;
+ jc->parse_buffer[jc->parse_buffer_count] = 0;
+
+ /* attempt decoding ... */
+ if (jc->utf16_high_surrogate) {
+ if (IS_LOW_SURROGATE(uc)) {
+ uc = DECODE_SURROGATE_PAIR(jc->utf16_high_surrogate, uc);
+ trail_bytes = 3;
+ jc->utf16_high_surrogate = 0;
+ } else {
+ /* high surrogate without a following low surrogate */
+ return false;
+ }
+ } else {
+ if (uc < 0x80) {
+ trail_bytes = 0;
+ } else if (uc < 0x800) {
+ trail_bytes = 1;
+ } else if (IS_HIGH_SURROGATE(uc)) {
+ /* save the high surrogate and wait for the low surrogate */
+ jc->utf16_high_surrogate = uc;
+ return true;
+ } else if (IS_LOW_SURROGATE(uc)) {
+ /* low surrogate without a preceding high surrogate */
+ return false;
+ } else {
+ trail_bytes = 2;
+ }
+ }
+
+ jc->parse_buffer[jc->parse_buffer_count++] = (char) ((uc >> (trail_bytes * 6)) | utf8_lead_bits[trail_bytes]);
+
+ for (i = trail_bytes * 6 - 6; i >= 0; i -= 6) {
+ jc->parse_buffer[jc->parse_buffer_count++] = (char) (((uc >> i) & 0x3F) | 0x80);
+ }
+
+ jc->parse_buffer[jc->parse_buffer_count] = 0;
+
+ return true;
+}
+
+static int add_escaped_char_to_parse_buffer(JSON_parser jc, int next_char)
+{
+ jc->escaped = 0;
+ /* remove the backslash */
+ parse_buffer_pop_back_char(jc);
+ switch(next_char) {
+ case 'b':
+ parse_buffer_push_back_char(jc, '\b');
+ break;
+ case 'f':
+ parse_buffer_push_back_char(jc, '\f');
+ break;
+ case 'n':
+ parse_buffer_push_back_char(jc, '\n');
+ break;
+ case 'r':
+ parse_buffer_push_back_char(jc, '\r');
+ break;
+ case 't':
+ parse_buffer_push_back_char(jc, '\t');
+ break;
+ case '"':
+ parse_buffer_push_back_char(jc, '"');
+ break;
+ case '\\':
+ parse_buffer_push_back_char(jc, '\\');
+ break;
+ case '/':
+ parse_buffer_push_back_char(jc, '/');
+ break;
+ case 'u':
+ parse_buffer_push_back_char(jc, '\\');
+ parse_buffer_push_back_char(jc, 'u');
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+#define add_char_to_parse_buffer(jc, next_char, next_class) \
+ do { \
+ if (jc->escaped) { \
+ if (!add_escaped_char_to_parse_buffer(jc, next_char)) \
+ return false; \
+ } else if (!jc->comment) { \
+ if ((jc->type != JSON_T_NONE) | !((next_class == C_SPACE) | (next_class == C_WHITE)) /* non-white-space */) { \
+ parse_buffer_push_back_char(jc, (char)next_char); \
+ } \
+ } \
+ } while (0)
+
+
+#define assert_type_isnt_string_null_or_bool(jc) \
+ assert(jc->type != JSON_T_FALSE); \
+ assert(jc->type != JSON_T_TRUE); \
+ assert(jc->type != JSON_T_NULL); \
+ assert(jc->type != JSON_T_STRING)
+
+
+int
+JSON_parser_char(JSON_parser jc, int next_char)
+{
+/*
+ After calling new_JSON_parser, call this function for each character (or
+ partial character) in your JSON text. It can accept UTF-8, UTF-16, or
+ UTF-32. It returns true if things are looking ok so far. If it rejects the
+ text, it returns false.
+*/
+ int next_class, next_state;
+
+/*
+ Determine the character's class.
+*/
+ if (next_char < 0) {
+ return false;
+ }
+ if (next_char >= 128) {
+ next_class = C_ETC;
+ } else {
+ next_class = ascii_class[next_char];
+ if (next_class <= __) {
+ return false;
+ }
+ }
+
+ add_char_to_parse_buffer(jc, next_char, next_class);
+
+/*
+ Get the next state from the state transition table.
+*/
+ next_state = state_transition_table[jc->state][next_class];
+ if (next_state >= 0) {
+/*
+ Change the state.
+*/
+ jc->state = next_state;
+ } else {
+/*
+ Or perform one of the actions.
+*/
+ switch (next_state) {
+/* Unicode character */
+ case UC:
+ if(!decode_unicode_char(jc)) {
+ return false;
+ }
+ /* check if we need to read a second UTF-16 char */
+ if (jc->utf16_high_surrogate) {
+ jc->state = D1;
+ } else {
+ jc->state = ST;
+ }
+ break;
+/* escaped char */
+ case EX:
+ jc->escaped = 1;
+ jc->state = ES;
+ break;
+/* integer detected by minus */
+ case MX:
+ jc->type = JSON_T_INTEGER;
+ jc->state = MI;
+ break;
+/* integer detected by zero */
+ case ZX:
+ jc->type = JSON_T_INTEGER;
+ jc->state = ZE;
+ break;
+/* integer detected by 1-9 */
+ case IX:
+ jc->type = JSON_T_INTEGER;
+ jc->state = IT;
+ break;
+
+/* floating point number detected by exponent*/
+ case DE:
+ assert_type_isnt_string_null_or_bool(jc);
+ jc->type = JSON_T_FLOAT;
+ jc->state = E1;
+ break;
+
+/* floating point number detected by fraction */
+ case DF:
+ assert_type_isnt_string_null_or_bool(jc);
+ if (!jc->handle_floats_manually) {
+/*
+ Some versions of strtod (which underlies sscanf) don't support converting
+ C-locale formated floating point values.
+*/
+ assert(jc->parse_buffer[jc->parse_buffer_count-1] == '.');
+ jc->parse_buffer[jc->parse_buffer_count-1] = jc->decimal_point;
+ }
+ jc->type = JSON_T_FLOAT;
+ jc->state = FX;
+ break;
+/* string begin " */
+ case SB:
+ parse_buffer_clear(jc);
+ assert(jc->type == JSON_T_NONE);
+ jc->type = JSON_T_STRING;
+ jc->state = ST;
+ break;
+
+/* n */
+ case NU:
+ assert(jc->type == JSON_T_NONE);
+ jc->type = JSON_T_NULL;
+ jc->state = N1;
+ break;
+/* f */
+ case FA:
+ assert(jc->type == JSON_T_NONE);
+ jc->type = JSON_T_FALSE;
+ jc->state = F1;
+ break;
+/* t */
+ case TR:
+ assert(jc->type == JSON_T_NONE);
+ jc->type = JSON_T_TRUE;
+ jc->state = T1;
+ break;
+
+/* closing comment */
+ case CE:
+ jc->comment = 0;
+ assert(jc->parse_buffer_count == 0);
+ assert(jc->type == JSON_T_NONE);
+ jc->state = jc->before_comment_state;
+ break;
+
+/* opening comment */
+ case CB:
+ if (!jc->allow_comments) {
+ return false;
+ }
+ parse_buffer_pop_back_char(jc);
+ if (!parse_parse_buffer(jc)) {
+ return false;
+ }
+ assert(jc->parse_buffer_count == 0);
+ assert(jc->type != JSON_T_STRING);
+ switch (jc->stack[jc->top]) {
+ case MODE_ARRAY:
+ case MODE_OBJECT:
+ switch(jc->state) {
+ case VA:
+ case AR:
+ jc->before_comment_state = jc->state;
+ break;
+ default:
+ jc->before_comment_state = OK;
+ break;
+ }
+ break;
+ default:
+ jc->before_comment_state = jc->state;
+ break;
+ }
+ jc->type = JSON_T_NONE;
+ jc->state = C1;
+ jc->comment = 1;
+ break;
+/* empty } */
+ case -9:
+ parse_buffer_clear(jc);
+ if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_OBJECT_END, NULL)) {
+ return false;
+ }
+ if (!pop(jc, MODE_KEY)) {
+ return false;
+ }
+ jc->state = OK;
+ break;
+
+/* } */ case -8:
+ parse_buffer_pop_back_char(jc);
+ if (!parse_parse_buffer(jc)) {
+ return false;
+ }
+ if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_OBJECT_END, NULL)) {
+ return false;
+ }
+ if (!pop(jc, MODE_OBJECT)) {
+ return false;
+ }
+ jc->type = JSON_T_NONE;
+ jc->state = OK;
+ break;
+
+/* ] */ case -7:
+ parse_buffer_pop_back_char(jc);
+ if (!parse_parse_buffer(jc)) {
+ return false;
+ }
+ if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_ARRAY_END, NULL)) {
+ return false;
+ }
+ if (!pop(jc, MODE_ARRAY)) {
+ return false;
+ }
+
+ jc->type = JSON_T_NONE;
+ jc->state = OK;
+ break;
+
+/* { */ case -6:
+ parse_buffer_pop_back_char(jc);
+ if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_OBJECT_BEGIN, NULL)) {
+ return false;
+ }
+ if (!push(jc, MODE_KEY)) {
+ return false;
+ }
+ assert(jc->type == JSON_T_NONE);
+ jc->state = OB;
+ break;
+
+/* [ */ case -5:
+ parse_buffer_pop_back_char(jc);
+ if (jc->callback && !(*jc->callback)(jc->ctx, JSON_T_ARRAY_BEGIN, NULL)) {
+ return false;
+ }
+ if (!push(jc, MODE_ARRAY)) {
+ return false;
+ }
+ assert(jc->type == JSON_T_NONE);
+ jc->state = AR;
+ break;
+
+/* string end " */ case -4:
+ parse_buffer_pop_back_char(jc);
+ switch (jc->stack[jc->top]) {
+ case MODE_KEY:
+ assert(jc->type == JSON_T_STRING);
+ jc->type = JSON_T_NONE;
+ jc->state = CO;
+
+ if (jc->callback) {
+ JSON_value value;
+ value.vu.str.value = jc->parse_buffer;
+ value.vu.str.length = jc->parse_buffer_count;
+ if (!(*jc->callback)(jc->ctx, JSON_T_KEY, &value)) {
+ return false;
+ }
+ }
+ parse_buffer_clear(jc);
+ break;
+ case MODE_ARRAY:
+ case MODE_OBJECT:
+ assert(jc->type == JSON_T_STRING);
+ if (!parse_parse_buffer(jc)) {
+ return false;
+ }
+ jc->type = JSON_T_NONE;
+ jc->state = OK;
+ break;
+ default:
+ return false;
+ }
+ break;
+
+/* , */ case -3:
+ parse_buffer_pop_back_char(jc);
+ if (!parse_parse_buffer(jc)) {
+ return false;
+ }
+ switch (jc->stack[jc->top]) {
+ case MODE_OBJECT:
+/*
+ A comma causes a flip from object mode to key mode.
+*/
+ if (!pop(jc, MODE_OBJECT) || !push(jc, MODE_KEY)) {
+ return false;
+ }
+ assert(jc->type != JSON_T_STRING);
+ jc->type = JSON_T_NONE;
+ jc->state = KE;
+ break;
+ case MODE_ARRAY:
+ assert(jc->type != JSON_T_STRING);
+ jc->type = JSON_T_NONE;
+ jc->state = VA;
+ break;
+ default:
+ return false;
+ }
+ break;
+
+/* : */ case -2:
+/*
+ A colon causes a flip from key mode to object mode.
+*/
+ parse_buffer_pop_back_char(jc);
+ if (!pop(jc, MODE_KEY) || !push(jc, MODE_OBJECT)) {
+ return false;
+ }
+ assert(jc->type == JSON_T_NONE);
+ jc->state = VA;
+ break;
+/*
+ Bad action.
+*/
+ default:
+ return false;
+ }
+ }
+ return true;
+}
+
+
+int
+JSON_parser_done(JSON_parser jc)
+{
+ const int result = jc->state == OK && pop(jc, MODE_DONE);
+
+ return result;
+}
+
+
+int JSON_parser_is_legal_white_space_string(const char* s)
+{
+ int c, char_class;
+
+ if (s == NULL) {
+ return false;
+ }
+
+ for (; *s; ++s) {
+ c = *s;
+
+ if (c < 0 || c >= 128) {
+ return false;
+ }
+
+ char_class = ascii_class[c];
+
+ if (char_class != C_SPACE && char_class != C_WHITE) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+
+
+void init_JSON_config(JSON_config* config)
+{
+ if (config) {
+ memset(config, 0, sizeof(*config));
+
+ config->depth = JSON_PARSER_STACK_SIZE - 1;
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 02:23:58 +0000