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releases-comm-central/third_party/json-c/json_tokener.c

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36 KiB
C
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/*
* $Id: json_tokener.c,v 1.20 2006/07/25 03:24:50 mclark Exp $
*
* Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
* Michael Clark <michael@metaparadigm.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See COPYING for details.
*
*
* Copyright (c) 2008-2009 Yahoo! Inc. All rights reserved.
* The copyrights to the contents of this file are licensed under the MIT License
* (https://www.opensource.org/licenses/mit-license.php)
*/
#include "config.h"
#include "math_compat.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "debug.h"
#include "json_inttypes.h"
#include "json_object.h"
#include "json_object_private.h"
#include "json_tokener.h"
#include "json_util.h"
#include "printbuf.h"
#include "strdup_compat.h"
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif /* HAVE_LOCALE_H */
#ifdef HAVE_XLOCALE_H
#include <xlocale.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#define jt_hexdigit(x) (((x) <= '9') ? (x) - '0' : ((x)&7) + 9)
#if !HAVE_STRNCASECMP && defined(_MSC_VER)
/* MSC has the version as _strnicmp */
#define strncasecmp _strnicmp
#elif !HAVE_STRNCASECMP
#error You do not have strncasecmp on your system.
#endif /* HAVE_STRNCASECMP */
#if defined(_MSC_VER) && (_MSC_VER <= 1800)
/* VS2013 doesn't know about "inline" */
#define inline __inline
#elif defined(AIX_CC)
#define inline
#endif
/* The following helper functions are used to speed up parsing. They
* are faster than their ctype counterparts because they assume that
* the input is in ASCII and that the locale is set to "C". The
* compiler will also inline these functions, providing an additional
* speedup by saving on function calls.
*/
static inline int is_ws_char(char c)
{
return c == ' '
|| c == '\t'
|| c == '\n'
|| c == '\r';
}
static inline int is_hex_char(char c)
{
return (c >= '0' && c <= '9')
|| (c >= 'A' && c <= 'F')
|| (c >= 'a' && c <= 'f');
}
/* Use C99 NAN by default; if not available, nan("") should work too. */
#ifndef NAN
#define NAN nan("")
#endif /* !NAN */
static const char json_null_str[] = "null";
static const int json_null_str_len = sizeof(json_null_str) - 1;
static const char json_inf_str[] = "Infinity";
/* Swapped case "Infinity" to avoid need to call tolower() on input chars: */
static const char json_inf_str_invert[] = "iNFINITY";
static const unsigned int json_inf_str_len = sizeof(json_inf_str) - 1;
static const char json_nan_str[] = "NaN";
static const int json_nan_str_len = sizeof(json_nan_str) - 1;
static const char json_true_str[] = "true";
static const int json_true_str_len = sizeof(json_true_str) - 1;
static const char json_false_str[] = "false";
static const int json_false_str_len = sizeof(json_false_str) - 1;
/* clang-format off */
static const char *json_tokener_errors[] = {
"success",
"continue",
"nesting too deep",
"unexpected end of data",
"unexpected character",
"null expected",
"boolean expected",
"number expected",
"array value separator ',' expected",
"quoted object property name expected",
"object property name separator ':' expected",
"object value separator ',' expected",
"invalid string sequence",
"expected comment",
"invalid utf-8 string",
"buffer size overflow",
"out of memory"
};
/* clang-format on */
/**
* validete the utf-8 string in strict model.
* if not utf-8 format, return err.
*/
static json_bool json_tokener_validate_utf8(const char c, unsigned int *nBytes);
static int json_tokener_parse_double(const char *buf, int len, double *retval);
const char *json_tokener_error_desc(enum json_tokener_error jerr)
{
int jerr_int = (int)jerr;
if (jerr_int < 0 ||
jerr_int >= (int)(sizeof(json_tokener_errors) / sizeof(json_tokener_errors[0])))
return "Unknown error, "
"invalid json_tokener_error value passed to json_tokener_error_desc()";
return json_tokener_errors[jerr];
}
enum json_tokener_error json_tokener_get_error(struct json_tokener *tok)
{
return tok->err;
}
/* Stuff for decoding unicode sequences */
#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_replacement_char[3] = {0xEF, 0xBF, 0xBD};
struct json_tokener *json_tokener_new_ex(int depth)
{
struct json_tokener *tok;
tok = (struct json_tokener *)calloc(1, sizeof(struct json_tokener));
if (!tok)
return NULL;
tok->stack = (struct json_tokener_srec *)calloc(depth, sizeof(struct json_tokener_srec));
if (!tok->stack)
{
free(tok);
return NULL;
}
tok->pb = printbuf_new();
if (!tok->pb)
{
free(tok->stack);
free(tok);
return NULL;
}
tok->max_depth = depth;
json_tokener_reset(tok);
return tok;
}
struct json_tokener *json_tokener_new(void)
{
return json_tokener_new_ex(JSON_TOKENER_DEFAULT_DEPTH);
}
void json_tokener_free(struct json_tokener *tok)
{
json_tokener_reset(tok);
if (tok->pb)
printbuf_free(tok->pb);
free(tok->stack);
free(tok);
}
static void json_tokener_reset_level(struct json_tokener *tok, int depth)
{
tok->stack[depth].state = json_tokener_state_eatws;
tok->stack[depth].saved_state = json_tokener_state_start;
json_object_put(tok->stack[depth].current);
tok->stack[depth].current = NULL;
free(tok->stack[depth].obj_field_name);
tok->stack[depth].obj_field_name = NULL;
}
void json_tokener_reset(struct json_tokener *tok)
{
int i;
if (!tok)
return;
for (i = tok->depth; i >= 0; i--)
json_tokener_reset_level(tok, i);
tok->depth = 0;
tok->err = json_tokener_success;
}
struct json_object *json_tokener_parse(const char *str)
{
enum json_tokener_error jerr_ignored;
struct json_object *obj;
obj = json_tokener_parse_verbose(str, &jerr_ignored);
return obj;
}
struct json_object *json_tokener_parse_verbose(const char *str, enum json_tokener_error *error)
{
struct json_tokener *tok;
struct json_object *obj;
tok = json_tokener_new();
if (!tok)
return NULL;
obj = json_tokener_parse_ex(tok, str, -1);
*error = tok->err;
if (tok->err != json_tokener_success
#if 0
/* This would be a more sensible default, and cause parsing
* things like "null123" to fail when the caller can't know
* where the parsing left off, but starting to fail would
* be a notable behaviour change. Save for a 1.0 release.
*/
|| json_tokener_get_parse_end(tok) != strlen(str)
#endif
)
{
if (obj != NULL)
json_object_put(obj);
obj = NULL;
}
json_tokener_free(tok);
return obj;
}
#define state tok->stack[tok->depth].state
#define saved_state tok->stack[tok->depth].saved_state
#define current tok->stack[tok->depth].current
#define obj_field_name tok->stack[tok->depth].obj_field_name
/* Optimization:
* json_tokener_parse_ex() consumed a lot of CPU in its main loop,
* iterating character-by character. A large performance boost is
* achieved by using tighter loops to locally handle units such as
* comments and strings. Loops that handle an entire token within
* their scope also gather entire strings and pass them to
* printbuf_memappend() in a single call, rather than calling
* printbuf_memappend() one char at a time.
*
* PEEK_CHAR() and ADVANCE_CHAR() macros are used for code that is
* common to both the main loop and the tighter loops.
*/
/* PEEK_CHAR(dest, tok) macro:
* Peeks at the current char and stores it in dest.
* Returns 1 on success, sets tok->err and returns 0 if no more chars.
* Implicit inputs: str, len, nBytesp vars
*/
#define PEEK_CHAR(dest, tok) \
(((tok)->char_offset == len) \
? (((tok)->depth == 0 && state == json_tokener_state_eatws && \
saved_state == json_tokener_state_finish) \
? (((tok)->err = json_tokener_success), 0) \
: (((tok)->err = json_tokener_continue), 0)) \
: (((tok->flags & JSON_TOKENER_VALIDATE_UTF8) && \
(!json_tokener_validate_utf8(*str, nBytesp))) \
? ((tok->err = json_tokener_error_parse_utf8_string), 0) \
: (((dest) = *str), 1)))
/* ADVANCE_CHAR() macro:
* Increments str & tok->char_offset.
* For convenience of existing conditionals, returns the old value of c (0 on eof).
* Implicit inputs: c var
*/
#define ADVANCE_CHAR(str, tok) (++(str), ((tok)->char_offset)++, c)
/* printbuf_memappend_checked(p, s, l) macro:
* Add string s of length l to printbuffer p.
* If operation fails abort parse operation with memory error.
*/
#define printbuf_memappend_checked(p, s, l) \
do { \
if (printbuf_memappend((p), (s), (l)) < 0) \
{ \
tok->err = json_tokener_error_memory; \
goto out; \
} \
} while (0)
/* End optimization macro defs */
struct json_object *json_tokener_parse_ex(struct json_tokener *tok, const char *str, int len)
{
struct json_object *obj = NULL;
char c = '\1';
unsigned int nBytes = 0;
unsigned int *nBytesp = &nBytes;
#ifdef HAVE_USELOCALE
locale_t oldlocale = uselocale(NULL);
locale_t newloc;
#elif defined(HAVE_SETLOCALE)
char *oldlocale = NULL;
#endif
tok->char_offset = 0;
tok->err = json_tokener_success;
/* this interface is presently not 64-bit clean due to the int len argument
* and the internal printbuf interface that takes 32-bit int len arguments
* so the function limits the maximum string size to INT32_MAX (2GB).
* If the function is called with len == -1 then strlen is called to check
* the string length is less than INT32_MAX (2GB)
*/
if ((len < -1) || (len == -1 && strlen(str) > INT32_MAX))
{
tok->err = json_tokener_error_size;
return NULL;
}
#ifdef HAVE_USELOCALE
{
locale_t duploc = duplocale(oldlocale);
newloc = newlocale(LC_NUMERIC_MASK, "C", duploc);
if (newloc == NULL)
{
freelocale(duploc);
return NULL;
}
#ifdef NEWLOCALE_NEEDS_FREELOCALE
// Older versions of FreeBSD (<12.4) don't free the locale
// passed to newlocale(), so do it here
freelocale(duploc);
#endif
uselocale(newloc);
}
#elif defined(HAVE_SETLOCALE)
{
char *tmplocale;
tmplocale = setlocale(LC_NUMERIC, NULL);
if (tmplocale)
{
oldlocale = strdup(tmplocale);
if (oldlocale == NULL)
return NULL;
}
setlocale(LC_NUMERIC, "C");
}
#endif
while (PEEK_CHAR(c, tok)) // Note: c might be '\0' !
{
redo_char:
switch (state)
{
case json_tokener_state_eatws:
/* Advance until we change state */
while (is_ws_char(c))
{
if ((!ADVANCE_CHAR(str, tok)) || (!PEEK_CHAR(c, tok)))
goto out;
}
if (c == '/' && !(tok->flags & JSON_TOKENER_STRICT))
{
printbuf_reset(tok->pb);
printbuf_memappend_checked(tok->pb, &c, 1);
state = json_tokener_state_comment_start;
}
else
{
state = saved_state;
goto redo_char;
}
break;
case json_tokener_state_start:
switch (c)
{
case '{':
state = json_tokener_state_eatws;
saved_state = json_tokener_state_object_field_start;
current = json_object_new_object();
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
break;
case '[':
state = json_tokener_state_eatws;
saved_state = json_tokener_state_array;
current = json_object_new_array();
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
break;
case 'I':
case 'i':
state = json_tokener_state_inf;
printbuf_reset(tok->pb);
tok->st_pos = 0;
goto redo_char;
case 'N':
case 'n':
state = json_tokener_state_null; // or NaN
printbuf_reset(tok->pb);
tok->st_pos = 0;
goto redo_char;
case '\'':
if (tok->flags & JSON_TOKENER_STRICT)
{
/* in STRICT mode only double-quote are allowed */
tok->err = json_tokener_error_parse_unexpected;
goto out;
}
/* FALLTHRU */
case '"':
state = json_tokener_state_string;
printbuf_reset(tok->pb);
tok->quote_char = c;
break;
case 'T':
case 't':
case 'F':
case 'f':
state = json_tokener_state_boolean;
printbuf_reset(tok->pb);
tok->st_pos = 0;
goto redo_char;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
state = json_tokener_state_number;
printbuf_reset(tok->pb);
tok->is_double = 0;
goto redo_char;
default: tok->err = json_tokener_error_parse_unexpected; goto out;
}
break;
case json_tokener_state_finish:
if (tok->depth == 0)
goto out;
obj = json_object_get(current);
json_tokener_reset_level(tok, tok->depth);
tok->depth--;
goto redo_char;
case json_tokener_state_inf: /* aka starts with 'i' (or 'I', or "-i", or "-I") */
{
/* If we were guaranteed to have len set, then we could (usually) handle
* the entire "Infinity" check in a single strncmp (strncasecmp), but
* since len might be -1 (i.e. "read until \0"), we need to check it
* a character at a time.
* Trying to handle it both ways would make this code considerably more
* complicated with likely little performance benefit.
*/
int is_negative = 0;
/* Note: tok->st_pos must be 0 when state is set to json_tokener_state_inf */
while (tok->st_pos < (int)json_inf_str_len)
{
char inf_char = *str;
if (inf_char != json_inf_str[tok->st_pos] &&
((tok->flags & JSON_TOKENER_STRICT) ||
inf_char != json_inf_str_invert[tok->st_pos])
)
{
tok->err = json_tokener_error_parse_unexpected;
goto out;
}
tok->st_pos++;
(void)ADVANCE_CHAR(str, tok);
if (!PEEK_CHAR(c, tok))
{
/* out of input chars, for now at least */
goto out;
}
}
/* We checked the full length of "Infinity", so create the object.
* When handling -Infinity, the number parsing code will have dropped
* the "-" into tok->pb for us, so check it now.
*/
if (printbuf_length(tok->pb) > 0 && *(tok->pb->buf) == '-')
{
is_negative = 1;
}
current = json_object_new_double(is_negative ? -INFINITY : INFINITY);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
goto redo_char;
}
break;
case json_tokener_state_null: /* aka starts with 'n' */
{
int size;
int size_nan;
printbuf_memappend_checked(tok->pb, &c, 1);
size = json_min(tok->st_pos + 1, json_null_str_len);
size_nan = json_min(tok->st_pos + 1, json_nan_str_len);
if ((!(tok->flags & JSON_TOKENER_STRICT) &&
strncasecmp(json_null_str, tok->pb->buf, size) == 0) ||
(strncmp(json_null_str, tok->pb->buf, size) == 0))
{
if (tok->st_pos == json_null_str_len)
{
current = NULL;
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
goto redo_char;
}
}
else if ((!(tok->flags & JSON_TOKENER_STRICT) &&
strncasecmp(json_nan_str, tok->pb->buf, size_nan) == 0) ||
(strncmp(json_nan_str, tok->pb->buf, size_nan) == 0))
{
if (tok->st_pos == json_nan_str_len)
{
current = json_object_new_double(NAN);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
goto redo_char;
}
}
else
{
tok->err = json_tokener_error_parse_null;
goto out;
}
tok->st_pos++;
}
break;
case json_tokener_state_comment_start:
if (c == '*')
{
state = json_tokener_state_comment;
}
else if (c == '/')
{
state = json_tokener_state_comment_eol;
}
else
{
tok->err = json_tokener_error_parse_comment;
goto out;
}
printbuf_memappend_checked(tok->pb, &c, 1);
break;
case json_tokener_state_comment:
{
/* Advance until we change state */
const char *case_start = str;
while (c != '*')
{
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out;
}
}
printbuf_memappend_checked(tok->pb, case_start, 1 + str - case_start);
state = json_tokener_state_comment_end;
}
break;
case json_tokener_state_comment_eol:
{
/* Advance until we change state */
const char *case_start = str;
while (c != '\n')
{
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out;
}
}
printbuf_memappend_checked(tok->pb, case_start, str - case_start);
MC_DEBUG("json_tokener_comment: %s\n", tok->pb->buf);
state = json_tokener_state_eatws;
}
break;
case json_tokener_state_comment_end:
printbuf_memappend_checked(tok->pb, &c, 1);
if (c == '/')
{
MC_DEBUG("json_tokener_comment: %s\n", tok->pb->buf);
state = json_tokener_state_eatws;
}
else
{
state = json_tokener_state_comment;
}
break;
case json_tokener_state_string:
{
/* Advance until we change state */
const char *case_start = str;
while (1)
{
if (c == tok->quote_char)
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
current =
json_object_new_string_len(tok->pb->buf, tok->pb->bpos);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
break;
}
else if (c == '\\')
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
saved_state = json_tokener_state_string;
state = json_tokener_state_string_escape;
break;
}
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out;
}
}
}
break;
case json_tokener_state_string_escape:
switch (c)
{
case '"':
case '\\':
case '/':
printbuf_memappend_checked(tok->pb, &c, 1);
state = saved_state;
break;
case 'b':
case 'n':
case 'r':
case 't':
case 'f':
if (c == 'b')
printbuf_memappend_checked(tok->pb, "\b", 1);
else if (c == 'n')
printbuf_memappend_checked(tok->pb, "\n", 1);
else if (c == 'r')
printbuf_memappend_checked(tok->pb, "\r", 1);
else if (c == 't')
printbuf_memappend_checked(tok->pb, "\t", 1);
else if (c == 'f')
printbuf_memappend_checked(tok->pb, "\f", 1);
state = saved_state;
break;
case 'u':
tok->ucs_char = 0;
tok->st_pos = 0;
state = json_tokener_state_escape_unicode;
break;
default: tok->err = json_tokener_error_parse_string; goto out;
}
break;
// ===================================================
case json_tokener_state_escape_unicode:
{
/* Handle a 4-byte \uNNNN sequence, or two sequences if a surrogate pair */
while (1)
{
if (!c || !is_hex_char(c))
{
tok->err = json_tokener_error_parse_string;
goto out;
}
tok->ucs_char |=
((unsigned int)jt_hexdigit(c) << ((3 - tok->st_pos) * 4));
tok->st_pos++;
if (tok->st_pos >= 4)
break;
(void)ADVANCE_CHAR(str, tok);
if (!PEEK_CHAR(c, tok))
{
/*
* We're out of characters in the current call to
* json_tokener_parse(), but a subsequent call might
* provide us with more, so leave our current state
* as-is (including tok->high_surrogate) and return.
*/
goto out;
}
}
tok->st_pos = 0;
/* Now, we have a full \uNNNN sequence in tok->ucs_char */
/* If the *previous* sequence was a high surrogate ... */
if (tok->high_surrogate)
{
if (IS_LOW_SURROGATE(tok->ucs_char))
{
/* Recalculate the ucs_char, then fall thru to process normally */
tok->ucs_char = DECODE_SURROGATE_PAIR(tok->high_surrogate,
tok->ucs_char);
}
else
{
/* High surrogate was not followed by a low surrogate
* Replace the high and process the rest normally
*/
printbuf_memappend_checked(tok->pb,
(char *)utf8_replacement_char, 3);
}
tok->high_surrogate = 0;
}
if (tok->ucs_char < 0x80)
{
unsigned char unescaped_utf[1];
unescaped_utf[0] = tok->ucs_char;
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 1);
}
else if (tok->ucs_char < 0x800)
{
unsigned char unescaped_utf[2];
unescaped_utf[0] = 0xc0 | (tok->ucs_char >> 6);
unescaped_utf[1] = 0x80 | (tok->ucs_char & 0x3f);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 2);
}
else if (IS_HIGH_SURROGATE(tok->ucs_char))
{
/*
* The next two characters should be \u, HOWEVER,
* we can't simply peek ahead here, because the
* characters we need might not be passed to us
* until a subsequent call to json_tokener_parse.
* Instead, transition through a couple of states.
* (now):
* _escape_unicode => _unicode_need_escape
* (see a '\\' char):
* _unicode_need_escape => _unicode_need_u
* (see a 'u' char):
* _unicode_need_u => _escape_unicode
* ...and we'll end up back around here.
*/
tok->high_surrogate = tok->ucs_char;
tok->ucs_char = 0;
state = json_tokener_state_escape_unicode_need_escape;
break;
}
else if (IS_LOW_SURROGATE(tok->ucs_char))
{
/* Got a low surrogate not preceded by a high */
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
}
else if (tok->ucs_char < 0x10000)
{
unsigned char unescaped_utf[3];
unescaped_utf[0] = 0xe0 | (tok->ucs_char >> 12);
unescaped_utf[1] = 0x80 | ((tok->ucs_char >> 6) & 0x3f);
unescaped_utf[2] = 0x80 | (tok->ucs_char & 0x3f);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 3);
}
else if (tok->ucs_char < 0x110000)
{
unsigned char unescaped_utf[4];
unescaped_utf[0] = 0xf0 | ((tok->ucs_char >> 18) & 0x07);
unescaped_utf[1] = 0x80 | ((tok->ucs_char >> 12) & 0x3f);
unescaped_utf[2] = 0x80 | ((tok->ucs_char >> 6) & 0x3f);
unescaped_utf[3] = 0x80 | (tok->ucs_char & 0x3f);
printbuf_memappend_checked(tok->pb, (char *)unescaped_utf, 4);
}
else
{
/* Don't know what we got--insert the replacement char */
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
}
state = saved_state; // i.e. _state_string or _state_object_field
}
break;
case json_tokener_state_escape_unicode_need_escape:
// We get here after processing a high_surrogate
// require a '\\' char
if (!c || c != '\\')
{
/* Got a high surrogate without another sequence following
* it. Put a replacement char in for the high surrogate
* and pop back up to _state_string or _state_object_field.
*/
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
tok->high_surrogate = 0;
tok->ucs_char = 0;
tok->st_pos = 0;
state = saved_state;
goto redo_char;
}
state = json_tokener_state_escape_unicode_need_u;
break;
case json_tokener_state_escape_unicode_need_u:
/* We already had a \ char, check that it's \u */
if (!c || c != 'u')
{
/* Got a high surrogate with some non-unicode escape
* sequence following it.
* Put a replacement char in for the high surrogate
* and handle the escape sequence normally.
*/
printbuf_memappend_checked(tok->pb, (char *)utf8_replacement_char, 3);
tok->high_surrogate = 0;
tok->ucs_char = 0;
tok->st_pos = 0;
state = json_tokener_state_string_escape;
goto redo_char;
}
state = json_tokener_state_escape_unicode;
break;
// ===================================================
case json_tokener_state_boolean:
{
int size1, size2;
printbuf_memappend_checked(tok->pb, &c, 1);
size1 = json_min(tok->st_pos + 1, json_true_str_len);
size2 = json_min(tok->st_pos + 1, json_false_str_len);
if ((!(tok->flags & JSON_TOKENER_STRICT) &&
strncasecmp(json_true_str, tok->pb->buf, size1) == 0) ||
(strncmp(json_true_str, tok->pb->buf, size1) == 0))
{
if (tok->st_pos == json_true_str_len)
{
current = json_object_new_boolean(1);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
goto redo_char;
}
}
else if ((!(tok->flags & JSON_TOKENER_STRICT) &&
strncasecmp(json_false_str, tok->pb->buf, size2) == 0) ||
(strncmp(json_false_str, tok->pb->buf, size2) == 0))
{
if (tok->st_pos == json_false_str_len)
{
current = json_object_new_boolean(0);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
goto redo_char;
}
}
else
{
tok->err = json_tokener_error_parse_boolean;
goto out;
}
tok->st_pos++;
}
break;
case json_tokener_state_number:
{
/* Advance until we change state */
const char *case_start = str;
int case_len = 0;
int is_exponent = 0;
int neg_sign_ok = 1;
int pos_sign_ok = 0;
if (printbuf_length(tok->pb) > 0)
{
/* We don't save all state from the previous incremental parse
so we need to re-generate it based on the saved string so far.
*/
char *e_loc = strchr(tok->pb->buf, 'e');
if (!e_loc)
e_loc = strchr(tok->pb->buf, 'E');
if (e_loc)
{
char *last_saved_char =
&tok->pb->buf[printbuf_length(tok->pb) - 1];
is_exponent = 1;
pos_sign_ok = neg_sign_ok = 1;
/* If the "e" isn't at the end, we can't start with a '-' */
if (e_loc != last_saved_char)
{
neg_sign_ok = 0;
pos_sign_ok = 0;
}
// else leave it set to 1, i.e. start of the new input
}
}
while (c && ((c >= '0' && c <= '9') ||
(!is_exponent && (c == 'e' || c == 'E')) ||
(neg_sign_ok && c == '-') || (pos_sign_ok && c == '+') ||
(!tok->is_double && c == '.')))
{
pos_sign_ok = neg_sign_ok = 0;
++case_len;
/* non-digit characters checks */
/* note: since the main loop condition to get here was
* an input starting with 0-9 or '-', we are
* protected from input starting with '.' or
* e/E.
*/
switch (c)
{
case '.':
tok->is_double = 1;
pos_sign_ok = 1;
neg_sign_ok = 1;
break;
case 'e': /* FALLTHRU */
case 'E':
is_exponent = 1;
tok->is_double = 1;
/* the exponent part can begin with a negative sign */
pos_sign_ok = neg_sign_ok = 1;
break;
default: break;
}
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{
printbuf_memappend_checked(tok->pb, case_start, case_len);
goto out;
}
}
/*
Now we know c isn't a valid number char, but check whether
it might have been intended to be, and return a potentially
more understandable error right away.
However, if we're at the top-level, use the number as-is
because c can be part of a new object to parse on the
next call to json_tokener_parse().
*/
if (tok->depth > 0 && c != ',' && c != ']' && c != '}' && c != '/' &&
c != 'I' && c != 'i' && !is_ws_char(c))
{
tok->err = json_tokener_error_parse_number;
goto out;
}
if (case_len > 0)
printbuf_memappend_checked(tok->pb, case_start, case_len);
// Check for -Infinity
if (tok->pb->buf[0] == '-' && case_len <= 1 && (c == 'i' || c == 'I'))
{
state = json_tokener_state_inf;
tok->st_pos = 0;
goto redo_char;
}
if (tok->is_double && !(tok->flags & JSON_TOKENER_STRICT))
{
/* Trim some chars off the end, to allow things
like "123e+" to parse ok. */
while (printbuf_length(tok->pb) > 1)
{
char last_char = tok->pb->buf[printbuf_length(tok->pb) - 1];
if (last_char != 'e' && last_char != 'E' &&
last_char != '-' && last_char != '+')
{
break;
}
tok->pb->buf[printbuf_length(tok->pb) - 1] = '\0';
printbuf_length(tok->pb)--;
}
}
}
{
int64_t num64;
uint64_t numuint64;
double numd;
if (!tok->is_double && tok->pb->buf[0] == '-' &&
json_parse_int64(tok->pb->buf, &num64) == 0)
{
if (errno == ERANGE && (tok->flags & JSON_TOKENER_STRICT))
{
tok->err = json_tokener_error_parse_number;
goto out;
}
current = json_object_new_int64(num64);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
}
else if (!tok->is_double && tok->pb->buf[0] != '-' &&
json_parse_uint64(tok->pb->buf, &numuint64) == 0)
{
if (errno == ERANGE && (tok->flags & JSON_TOKENER_STRICT))
{
tok->err = json_tokener_error_parse_number;
goto out;
}
if (numuint64 && tok->pb->buf[0] == '0' &&
(tok->flags & JSON_TOKENER_STRICT))
{
tok->err = json_tokener_error_parse_number;
goto out;
}
if (numuint64 <= INT64_MAX)
{
num64 = (uint64_t)numuint64;
current = json_object_new_int64(num64);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
}
else
{
current = json_object_new_uint64(numuint64);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
}
}
else if (tok->is_double &&
json_tokener_parse_double(
tok->pb->buf, printbuf_length(tok->pb), &numd) == 0)
{
current = json_object_new_double_s(numd, tok->pb->buf);
if (current == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
}
else
{
tok->err = json_tokener_error_parse_number;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
goto redo_char;
}
break;
case json_tokener_state_array_after_sep:
case json_tokener_state_array:
if (c == ']')
{
// Minimize memory usage; assume parsed objs are unlikely to be changed
json_object_array_shrink(current, 0);
if (state == json_tokener_state_array_after_sep &&
(tok->flags & JSON_TOKENER_STRICT))
{
tok->err = json_tokener_error_parse_unexpected;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
}
else
{
if (tok->depth >= tok->max_depth - 1)
{
tok->err = json_tokener_error_depth;
goto out;
}
state = json_tokener_state_array_add;
tok->depth++;
json_tokener_reset_level(tok, tok->depth);
goto redo_char;
}
break;
case json_tokener_state_array_add:
if (json_object_array_add(current, obj) != 0)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_array_sep;
state = json_tokener_state_eatws;
goto redo_char;
case json_tokener_state_array_sep:
if (c == ']')
{
// Minimize memory usage; assume parsed objs are unlikely to be changed
json_object_array_shrink(current, 0);
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
}
else if (c == ',')
{
saved_state = json_tokener_state_array_after_sep;
state = json_tokener_state_eatws;
}
else
{
tok->err = json_tokener_error_parse_array;
goto out;
}
break;
case json_tokener_state_object_field_start:
case json_tokener_state_object_field_start_after_sep:
if (c == '}')
{
if (state == json_tokener_state_object_field_start_after_sep &&
(tok->flags & JSON_TOKENER_STRICT))
{
tok->err = json_tokener_error_parse_unexpected;
goto out;
}
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
}
else if (c == '"' || c == '\'')
{
tok->quote_char = c;
printbuf_reset(tok->pb);
state = json_tokener_state_object_field;
}
else
{
tok->err = json_tokener_error_parse_object_key_name;
goto out;
}
break;
case json_tokener_state_object_field:
{
/* Advance until we change state */
const char *case_start = str;
while (1)
{
if (c == tok->quote_char)
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
obj_field_name = strdup(tok->pb->buf);
if (obj_field_name == NULL)
{
tok->err = json_tokener_error_memory;
goto out;
}
saved_state = json_tokener_state_object_field_end;
state = json_tokener_state_eatws;
break;
}
else if (c == '\\')
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
saved_state = json_tokener_state_object_field;
state = json_tokener_state_string_escape;
break;
}
if (!ADVANCE_CHAR(str, tok) || !PEEK_CHAR(c, tok))
{
printbuf_memappend_checked(tok->pb, case_start,
str - case_start);
goto out;
}
}
}
break;
case json_tokener_state_object_field_end:
if (c == ':')
{
saved_state = json_tokener_state_object_value;
state = json_tokener_state_eatws;
}
else
{
tok->err = json_tokener_error_parse_object_key_sep;
goto out;
}
break;
case json_tokener_state_object_value:
if (tok->depth >= tok->max_depth - 1)
{
tok->err = json_tokener_error_depth;
goto out;
}
state = json_tokener_state_object_value_add;
tok->depth++;
json_tokener_reset_level(tok, tok->depth);
goto redo_char;
case json_tokener_state_object_value_add:
json_object_object_add(current, obj_field_name, obj);
free(obj_field_name);
obj_field_name = NULL;
saved_state = json_tokener_state_object_sep;
state = json_tokener_state_eatws;
goto redo_char;
case json_tokener_state_object_sep:
/* { */
if (c == '}')
{
saved_state = json_tokener_state_finish;
state = json_tokener_state_eatws;
}
else if (c == ',')
{
saved_state = json_tokener_state_object_field_start_after_sep;
state = json_tokener_state_eatws;
}
else
{
tok->err = json_tokener_error_parse_object_value_sep;
goto out;
}
break;
}
(void)ADVANCE_CHAR(str, tok);
if (!c) // This is the char *before* advancing
break;
} /* while(PEEK_CHAR) */
out:
if ((tok->flags & JSON_TOKENER_VALIDATE_UTF8) && (nBytes != 0))
{
tok->err = json_tokener_error_parse_utf8_string;
}
if (c && (state == json_tokener_state_finish) && (tok->depth == 0) &&
(tok->flags & (JSON_TOKENER_STRICT | JSON_TOKENER_ALLOW_TRAILING_CHARS)) ==
JSON_TOKENER_STRICT)
{
/* unexpected char after JSON data */
tok->err = json_tokener_error_parse_unexpected;
}
if (!c)
{
/* We hit an eof char (0) */
if (state != json_tokener_state_finish && saved_state != json_tokener_state_finish)
tok->err = json_tokener_error_parse_eof;
}
#ifdef HAVE_USELOCALE
uselocale(oldlocale);
freelocale(newloc);
#elif defined(HAVE_SETLOCALE)
setlocale(LC_NUMERIC, oldlocale);
free(oldlocale);
#endif
if (tok->err == json_tokener_success)
{
json_object *ret = json_object_get(current);
int ii;
/* Partially reset, so we parse additional objects on subsequent calls. */
for (ii = tok->depth; ii >= 0; ii--)
json_tokener_reset_level(tok, ii);
return ret;
}
MC_DEBUG("json_tokener_parse_ex: error %s at offset %d\n", json_tokener_errors[tok->err],
tok->char_offset);
return NULL;
}
static json_bool json_tokener_validate_utf8(const char c, unsigned int *nBytes)
{
unsigned char chr = c;
if (*nBytes == 0)
{
if (chr >= 0x80)
{
if ((chr & 0xe0) == 0xc0)
*nBytes = 1;
else if ((chr & 0xf0) == 0xe0)
*nBytes = 2;
else if ((chr & 0xf8) == 0xf0)
*nBytes = 3;
else
return 0;
}
}
else
{
if ((chr & 0xC0) != 0x80)
return 0;
(*nBytes)--;
}
return 1;
}
void json_tokener_set_flags(struct json_tokener *tok, int flags)
{
tok->flags = flags;
}
size_t json_tokener_get_parse_end(struct json_tokener *tok)
{
assert(tok->char_offset >= 0); /* Drop this line when char_offset becomes a size_t */
return (size_t)tok->char_offset;
}
static int json_tokener_parse_double(const char *buf, int len, double *retval)
{
char *end;
*retval = strtod(buf, &end);
if (buf + len == end)
return 0; // It worked
return 1;
}
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