mirror of
https://github.com/transmission/transmission
synced 2024-12-25 09:13:06 +00:00
1014 lines
32 KiB
C
1014 lines
32 KiB
C
/*
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Copyright (c) 2005 JSON.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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The Software shall be used for Good, not Evil.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/*
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Callbacks, comments, Unicode handling by Jean Gressmann (jean@0x42.de), 2007-2010.
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Changelog:
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2010-03-25
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Fixed buffer overrun in grow_parse_buffer & cleaned up code.
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2009-10-19
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Replaced long double in JSON_value_struct with double after reports
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of strtold being broken on some platforms (charles@transmissionbt.com).
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2009-05-17
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Incorporated benrudiak@googlemail.com fix for UTF16 decoding.
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2009-05-14
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Fixed float parsing bug related to a locale being set that didn't
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use '.' as decimal point character (charles@transmissionbt.com).
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2008-10-14
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Renamed states.IN to states.IT to avoid name clash which IN macro
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defined in windef.h (alexey.pelykh@gmail.com)
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2008-07-19
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Removed some duplicate code & debugging variable (charles@transmissionbt.com)
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2008-05-28
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Made JSON_value structure ansi C compliant. This bug was report by
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trisk@acm.jhu.edu
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2008-05-20
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Fixed bug reported by charles@transmissionbt.com where the switching
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from static to dynamic parse buffer did not copy the static parse
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buffer's content.
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*/
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#include <assert.h>
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#include <ctype.h>
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#include <float.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale.h>
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#include <stdarg.h> /* some 1.4.x versions of evutil.h need this */
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#include <evutil.h> /* evutil_strtoll() */
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#include "JSON_parser.h"
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#ifdef _MSC_VER
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# if _MSC_VER >= 1400 /* Visual Studio 2005 and up */
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# pragma warning(disable:4996) /* unsecure sscanf */
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# pragma warning(disable:4127) /* conditional expression is constant */
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# endif
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#endif
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#define true 1
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#define false 0
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#define __ -1 /* the universal error code */
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/* values chosen so that the object size is approx equal to one page (4K) */
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#ifndef JSON_PARSER_STACK_SIZE
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# define JSON_PARSER_STACK_SIZE 128
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#endif
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#ifndef JSON_PARSER_PARSE_BUFFER_SIZE
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# define JSON_PARSER_PARSE_BUFFER_SIZE 3500
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#endif
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typedef unsigned short UTF16;
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struct JSON_parser_struct {
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JSON_parser_callback callback;
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void* ctx;
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signed char state, before_comment_state, type, escaped, comment, allow_comments, handle_floats_manually;
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UTF16 utf16_high_surrogate;
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long depth;
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long top;
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signed char* stack;
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long stack_capacity;
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char decimal_point;
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char* parse_buffer;
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size_t parse_buffer_capacity;
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size_t parse_buffer_count;
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size_t comment_begin_offset;
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signed char static_stack[JSON_PARSER_STACK_SIZE];
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char static_parse_buffer[JSON_PARSER_PARSE_BUFFER_SIZE];
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};
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#define COUNTOF(x) (sizeof(x)/sizeof(x[0]))
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/*
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Characters are mapped into these character classes. This allows for
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a significant reduction in the size of the state transition table.
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*/
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enum classes {
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C_SPACE, /* space */
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C_WHITE, /* other whitespace */
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C_LCURB, /* { */
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C_RCURB, /* } */
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C_LSQRB, /* [ */
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C_RSQRB, /* ] */
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C_COLON, /* : */
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C_COMMA, /* , */
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C_QUOTE, /* " */
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C_BACKS, /* \ */
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C_SLASH, /* / */
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C_PLUS, /* + */
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C_MINUS, /* - */
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C_POINT, /* . */
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C_ZERO , /* 0 */
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C_DIGIT, /* 123456789 */
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C_LOW_A, /* a */
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C_LOW_B, /* b */
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C_LOW_C, /* c */
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C_LOW_D, /* d */
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C_LOW_E, /* e */
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C_LOW_F, /* f */
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C_LOW_L, /* l */
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C_LOW_N, /* n */
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C_LOW_R, /* r */
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C_LOW_S, /* s */
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C_LOW_T, /* t */
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C_LOW_U, /* u */
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C_ABCDF, /* ABCDF */
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C_E, /* E */
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C_ETC, /* everything else */
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C_STAR, /* * */
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NR_CLASSES
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};
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static const signed char ascii_class[128] = {
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/*
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This array maps the 128 ASCII characters into character classes.
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The remaining Unicode characters should be mapped to C_ETC.
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Non-whitespace control characters are errors.
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*/
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__, __, __, __, __, __, __, __,
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__, C_WHITE, C_WHITE, __, __, C_WHITE, __, __,
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__, __, __, __, __, __, __, __,
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__, __, __, __, __, __, __, __,
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C_SPACE, C_ETC, C_QUOTE, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
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C_ETC, C_ETC, C_STAR, C_PLUS, C_COMMA, C_MINUS, C_POINT, C_SLASH,
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C_ZERO, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT, C_DIGIT,
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C_DIGIT, C_DIGIT, C_COLON, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
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C_ETC, C_ABCDF, C_ABCDF, C_ABCDF, C_ABCDF, C_E, C_ABCDF, C_ETC,
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C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
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C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC, C_ETC,
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C_ETC, C_ETC, C_ETC, C_LSQRB, C_BACKS, C_RSQRB, C_ETC, C_ETC,
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C_ETC, C_LOW_A, C_LOW_B, C_LOW_C, C_LOW_D, C_LOW_E, C_LOW_F, C_ETC,
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C_ETC, C_ETC, C_ETC, C_ETC, C_LOW_L, C_ETC, C_LOW_N, C_ETC,
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C_ETC, C_ETC, C_LOW_R, C_LOW_S, C_LOW_T, C_LOW_U, C_ETC, C_ETC,
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C_ETC, C_ETC, C_ETC, C_LCURB, C_ETC, C_RCURB, C_ETC, C_ETC
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};
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/*
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The state codes.
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*/
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enum states {
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GO, /* start */
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OK, /* ok */
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OB, /* object */
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KE, /* key */
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CO, /* colon */
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VA, /* value */
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AR, /* array */
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ST, /* string */
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ES, /* escape */
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U1, /* u1 */
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U2, /* u2 */
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U3, /* u3 */
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U4, /* u4 */
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MI, /* minus */
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ZE, /* zero */
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IT, /* integer */
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FR, /* fraction */
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E1, /* e */
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E2, /* ex */
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E3, /* exp */
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T1, /* tr */
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T2, /* tru */
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T3, /* true */
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F1, /* fa */
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F2, /* fal */
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F3, /* fals */
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F4, /* false */
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N1, /* nu */
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N2, /* nul */
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N3, /* null */
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C1, /* / */
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C2, /* / * */
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C3, /* * */
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FX, /* *.* *eE* */
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D1, /* second UTF-16 character decoding started by \ */
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D2, /* second UTF-16 character proceeded by u */
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NR_STATES
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};
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enum actions
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{
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CB = -10, /* comment begin */
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CE = -11, /* comment end */
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FA = -12, /* false */
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TR = -13, /* false */
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NU = -14, /* null */
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DE = -15, /* double detected by exponent e E */
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DF = -16, /* double detected by fraction . */
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SB = -17, /* string begin */
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MX = -18, /* integer detected by minus */
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ZX = -19, /* integer detected by zero */
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IX = -20, /* integer detected by 1-9 */
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EX = -21, /* next char is escaped */
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UC = -22 /* Unicode character read */
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};
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static const signed char state_transition_table[NR_STATES][NR_CLASSES] = {
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/*
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The state transition table takes the current state and the current symbol,
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and returns either a new state or an action. An action is represented as a
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negative number. A JSON text is accepted if at the end of the text the
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state is OK and if the mode is MODE_DONE.
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white 1-9 ABCDF etc
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space | { } [ ] : , " \ / + - . 0 | a b c d e f l n r s t u | E | * */
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/*start GO*/ {GO,GO,-6,__,-5,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*ok OK*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*object OB*/ {OB,OB,__,-9,__,__,__,__,SB,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*key KE*/ {KE,KE,__,__,__,__,__,__,SB,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*colon CO*/ {CO,CO,__,__,__,__,-2,__,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*value VA*/ {VA,VA,-6,__,-5,__,__,__,SB,__,CB,__,MX,__,ZX,IX,__,__,__,__,__,FA,__,NU,__,__,TR,__,__,__,__,__},
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/*array AR*/ {AR,AR,-6,__,-5,-7,__,__,SB,__,CB,__,MX,__,ZX,IX,__,__,__,__,__,FA,__,NU,__,__,TR,__,__,__,__,__},
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/*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},
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/*escape ES*/ {__,__,__,__,__,__,__,__,ST,ST,ST,__,__,__,__,__,__,ST,__,__,__,ST,__,ST,ST,__,ST,U1,__,__,__,__},
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/*u1 U1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,U2,U2,U2,U2,U2,U2,U2,U2,__,__,__,__,__,__,U2,U2,__,__},
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/*u2 U2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,U3,U3,U3,U3,U3,U3,U3,U3,__,__,__,__,__,__,U3,U3,__,__},
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/*u3 U3*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,U4,U4,U4,U4,U4,U4,U4,U4,__,__,__,__,__,__,U4,U4,__,__},
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/*u4 U4*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,UC,UC,UC,UC,UC,UC,UC,UC,__,__,__,__,__,__,UC,UC,__,__},
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/*minus MI*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,ZE,IT,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*zero ZE*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,DF,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*int IT*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,DF,IT,IT,__,__,__,__,DE,__,__,__,__,__,__,__,__,DE,__,__},
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/*frac FR*/ {OK,OK,__,-8,__,-7,__,-3,__,__,CB,__,__,__,FR,FR,__,__,__,__,E1,__,__,__,__,__,__,__,__,E1,__,__},
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/*e E1*/ {__,__,__,__,__,__,__,__,__,__,__,E2,E2,__,E3,E3,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*ex E2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,E3,E3,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*exp E3*/ {OK,OK,__,-8,__,-7,__,-3,__,__,__,__,__,__,E3,E3,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*tr T1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,T2,__,__,__,__,__,__,__},
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/*tru T2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,T3,__,__,__,__},
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/*true T3*/ {__,__,__,__,__,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,OK,__,__,__,__,__,__,__,__,__,__,__},
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/*fa F1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,F2,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*fal F2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,F3,__,__,__,__,__,__,__,__,__},
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/*fals F3*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,F4,__,__,__,__,__,__},
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/*false F4*/ {__,__,__,__,__,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,OK,__,__,__,__,__,__,__,__,__,__,__},
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/*nu N1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,N2,__,__,__,__},
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/*nul N2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,N3,__,__,__,__,__,__,__,__,__},
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/*null N3*/ {__,__,__,__,__,__,__,__,__,__,CB,__,__,__,__,__,__,__,__,__,__,__,OK,__,__,__,__,__,__,__,__,__},
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/*/ C1*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,C2},
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/*/* 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},
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/** 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},
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/*_. FX*/ {OK,OK,__,-8,__,-7,__,-3,__,__,__,__,__,__,FR,FR,__,__,__,__,E1,__,__,__,__,__,__,__,__,E1,__,__},
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/*\ D1*/ {__,__,__,__,__,__,__,__,__,D2,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__},
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/*\ D2*/ {__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,__,U1,__,__,__,__},
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};
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/*
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These modes can be pushed on the stack.
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*/
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enum modes {
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MODE_ARRAY = 1,
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MODE_DONE = 2,
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MODE_KEY = 3,
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MODE_OBJECT = 4
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};
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static int
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push(JSON_parser jc, int mode)
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{
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/*
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Push a mode onto the stack. Return false if there is overflow.
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*/
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jc->top += 1;
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if (jc->depth < 0) {
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if (jc->top >= jc->stack_capacity) {
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size_t bytes_to_allocate;
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jc->stack_capacity *= 2;
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bytes_to_allocate = jc->stack_capacity * sizeof(jc->static_stack[0]);
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if (jc->stack == &jc->static_stack[0]) {
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jc->stack = (signed char*)malloc(bytes_to_allocate);
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memcpy(jc->stack, jc->static_stack, sizeof(jc->static_stack));
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} else {
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jc->stack = (signed char*)realloc(jc->stack, bytes_to_allocate);
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}
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}
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} else {
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if (jc->top >= jc->depth) {
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return false;
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}
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}
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jc->stack[jc->top] = (signed char)mode;
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return true;
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}
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static int
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pop(JSON_parser jc, int mode)
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{
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/*
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Pop the stack, assuring that the current mode matches the expectation.
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Return false if there is underflow or if the modes mismatch.
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*/
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if (jc->top < 0 || jc->stack[jc->top] != mode) {
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return false;
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}
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jc->top -= 1;
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return true;
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}
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#define parse_buffer_clear(jc) \
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do {\
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jc->parse_buffer_count = 0;\
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jc->parse_buffer[0] = 0;\
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} while (0)
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#define parse_buffer_pop_back_char(jc)\
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do {\
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assert(jc->parse_buffer_count >= 1);\
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--jc->parse_buffer_count;\
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jc->parse_buffer[jc->parse_buffer_count] = 0;\
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} while (0)
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void delete_JSON_parser(JSON_parser jc)
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{
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if (jc) {
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if (jc->stack != &jc->static_stack[0]) {
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free((void*)jc->stack);
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}
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if (jc->parse_buffer != &jc->static_parse_buffer[0]) {
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free((void*)jc->parse_buffer);
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}
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free((void*)jc);
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}
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}
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JSON_parser
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new_JSON_parser(JSON_config* config)
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{
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/*
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new_JSON_parser starts the checking process by constructing a JSON_parser
|
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object. It takes a depth parameter that restricts the level of maximum
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nesting.
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To continue the process, call JSON_parser_char for each character in the
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JSON text, and then call JSON_parser_done to obtain the final result.
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These functions are fully reentrant.
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*/
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int depth = 0;
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JSON_config default_config;
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JSON_parser jc = malloc(sizeof(struct JSON_parser_struct));
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memset(jc, 0, sizeof(*jc));
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|
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/* initialize configuration */
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init_JSON_config(&default_config);
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/* set to default configuration if none was provided */
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if (config == NULL) {
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config = &default_config;
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}
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depth = config->depth;
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/* We need to be able to push at least one object */
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if (depth == 0) {
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depth = 1;
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}
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jc->state = GO;
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jc->top = -1;
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|
|
/* 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 = (signed char)config->allow_comments != 0;
|
|
jc->handle_floats_manually = (signed char)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)
|
|
{
|
|
assert(jc->parse_buffer_capacity > 0);
|
|
|
|
jc->parse_buffer_capacity *= 2;
|
|
if (jc->parse_buffer == &jc->static_parse_buffer[0]) {
|
|
jc->parse_buffer = (char*)malloc(jc->parse_buffer_capacity);
|
|
memcpy(jc->parse_buffer, jc->static_parse_buffer, jc->parse_buffer_count);
|
|
} else {
|
|
jc->parse_buffer = (char*)realloc(jc->parse_buffer, jc->parse_buffer_capacity);
|
|
}
|
|
}
|
|
|
|
#define parse_buffer_push_back_char(jc, c)\
|
|
do {\
|
|
if (jc->parse_buffer_count + 2 >= 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 {
|
|
/* not checking with end pointer b/c there may be trailing ws */
|
|
value.vu.float_value = strtod(jc->parse_buffer, NULL);
|
|
}
|
|
break;
|
|
case JSON_T_INTEGER:
|
|
arg = &value;
|
|
value.vu.integer_value = evutil_strtoll( jc->parse_buffer, NULL, 10 );
|
|
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 const 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 = (UTF16)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 = (signed char)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;
|
|
}
|
|
}
|