json.c
/* vim: set et ts=3 sw=3 sts=3 ft=c:
*
* Copyright (C) 2012, 2013, 2014 James McLaughlin et al. All rights reserved.
* https://github.com/udp/json-parser
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "json.h"
#ifdef _MSC_VER
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#endif
const struct _json_value json_value_none;
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
typedef unsigned int json_uchar;
static unsigned char hex_value (json_char c)
{
if (isdigit(c))
return c - '0';
switch (c) {
case 'a': case 'A': return 0x0A;
case 'b': case 'B': return 0x0B;
case 'c': case 'C': return 0x0C;
case 'd': case 'D': return 0x0D;
case 'e': case 'E': return 0x0E;
case 'f': case 'F': return 0x0F;
default: return 0xFF;
}
}
typedef struct
{
unsigned long used_memory;
unsigned int uint_max;
unsigned long ulong_max;
json_settings settings;
int first_pass;
const json_char * ptr;
unsigned int cur_line, cur_col;
} json_state;
static void * default_alloc (size_t size, int zero, void * user_data)
{
return zero ? calloc (1, size) : malloc (size);
}
static void default_free (void * ptr, void * user_data)
{
free (ptr);
}
static void * json_alloc (json_state * state, unsigned long size, int zero)
{
if ((state->ulong_max - state->used_memory) < size)
return 0;
if (state->settings.max_memory
&& (state->used_memory += size) > state->settings.max_memory)
{
return 0;
}
return state->settings.mem_alloc (size, zero, state->settings.user_data);
}
static int new_value (json_state * state,
json_value ** top, json_value ** root, json_value ** alloc,
json_type type)
{
json_value * value;
int values_size;
if (!state->first_pass)
{
value = *top = *alloc;
*alloc = (*alloc)->_reserved.next_alloc;
if (!*root)
*root = value;
switch (value->type)
{
case json_array:
if (value->u.array.length == 0)
break;
if (! (value->u.array.values = (json_value **) json_alloc
(state, value->u.array.length * sizeof (json_value *), 0)) )
{
return 0;
}
value->u.array.length = 0;
break;
case json_object:
if (value->u.object.length == 0)
break;
values_size = sizeof (*value->u.object.values) * value->u.object.length;
if (! (value->u.object.values = (json_object_entry *) json_alloc
(state, values_size + ((unsigned long) value->u.object.values), 0)) )
{
return 0;
}
value->_reserved.object_mem = (*(char **) &value->u.object.values) + values_size;
value->u.object.length = 0;
break;
case json_string:
if (! (value->u.string.ptr = (json_char *) json_alloc
(state, (value->u.string.length + 1) * sizeof (json_char), 0)) )
{
return 0;
}
value->u.string.length = 0;
break;
default:
break;
};
return 1;
}
if (! (value = (json_value *) json_alloc
(state, sizeof (json_value) + state->settings.value_extra, 1)))
{
return 0;
}
if (!*root)
*root = value;
value->type = type;
value->parent = *top;
#ifdef JSON_TRACK_SOURCE
value->line = state->cur_line;
value->col = state->cur_col;
#endif
if (*alloc)
(*alloc)->_reserved.next_alloc = value;
*alloc = *top = value;
return 1;
}
#define whitespace \
case '\n': ++ state.cur_line; state.cur_col = 0; \
case ' ': case '\t': case '\r'
#define string_add(b) \
do { if (!state.first_pass) string [string_length] = b; ++ string_length; } while (0);
#define line_and_col \
state.cur_line, state.cur_col
static const long
flag_next = 1 << 0,
flag_reproc = 1 << 1,
flag_need_comma = 1 << 2,
flag_seek_value = 1 << 3,
flag_escaped = 1 << 4,
flag_string = 1 << 5,
flag_need_colon = 1 << 6,
flag_done = 1 << 7,
flag_num_negative = 1 << 8,
flag_num_zero = 1 << 9,
flag_num_e = 1 << 10,
flag_num_e_got_sign = 1 << 11,
flag_num_e_negative = 1 << 12,
flag_line_comment = 1 << 13,
flag_block_comment = 1 << 14;
json_value * json_parse_ex (json_settings * settings,
const json_char * json,
size_t length,
char * error_buf)
{
json_char error [json_error_max];
const json_char * end;
json_value * top, * root, * alloc = 0;
json_state state = { 0 };
long flags;
long num_digits = 0, num_e = 0;
json_int_t num_fraction = 0;
/* Skip UTF-8 BOM
*/
if (length >= 3 && ((unsigned char) json [0]) == 0xEF
&& ((unsigned char) json [1]) == 0xBB
&& ((unsigned char) json [2]) == 0xBF)
{
json += 3;
length -= 3;
}
error[0] = '\0';
end = (json + length);
memcpy (&state.settings, settings, sizeof (json_settings));
if (!state.settings.mem_alloc)
state.settings.mem_alloc = default_alloc;
if (!state.settings.mem_free)
state.settings.mem_free = default_free;
memset (&state.uint_max, 0xFF, sizeof (state.uint_max));
memset (&state.ulong_max, 0xFF, sizeof (state.ulong_max));
state.uint_max -= 8; /* limit of how much can be added before next check */
state.ulong_max -= 8;
for (state.first_pass = 1; state.first_pass >= 0; -- state.first_pass)
{
json_uchar uchar;
unsigned char uc_b1, uc_b2, uc_b3, uc_b4;
json_char * string = 0;
unsigned int string_length = 0;
top = root = 0;
flags = flag_seek_value;
state.cur_line = 1;
for (state.ptr = json ;; ++ state.ptr)
{
json_char b = (state.ptr == end ? 0 : *state.ptr);
if (flags & flag_string)
{
if (!b)
{ sprintf (error, "Unexpected EOF in string (at %d:%d)", line_and_col);
goto e_failed;
}
if (string_length > state.uint_max)
goto e_overflow;
if (flags & flag_escaped)
{
flags &= ~ flag_escaped;
switch (b)
{
case 'b': string_add ('\b'); break;
case 'f': string_add ('\f'); break;
case 'n': string_add ('\n'); break;
case 'r': string_add ('\r'); break;
case 't': string_add ('\t'); break;
case 'u':
if (end - state.ptr < 4 ||
(uc_b1 = hex_value (*++ state.ptr)) == 0xFF ||
(uc_b2 = hex_value (*++ state.ptr)) == 0xFF ||
(uc_b3 = hex_value (*++ state.ptr)) == 0xFF ||
(uc_b4 = hex_value (*++ state.ptr)) == 0xFF)
{
sprintf (error, "Invalid character value `%c` (at %d:%d)", b, line_and_col);
goto e_failed;
}
uc_b1 = (uc_b1 << 4) | uc_b2;
uc_b2 = (uc_b3 << 4) | uc_b4;
uchar = (uc_b1 << 8) | uc_b2;
if ((uchar & 0xF800) == 0xD800) {
json_uchar uchar2;
if (end - state.ptr < 6 || (*++ state.ptr) != '\\' || (*++ state.ptr) != 'u' ||
(uc_b1 = hex_value (*++ state.ptr)) == 0xFF ||
(uc_b2 = hex_value (*++ state.ptr)) == 0xFF ||
(uc_b3 = hex_value (*++ state.ptr)) == 0xFF ||
(uc_b4 = hex_value (*++ state.ptr)) == 0xFF)
{
sprintf (error, "Invalid character value `%c` (at %d:%d)", b, line_and_col);
goto e_failed;
}
uc_b1 = (uc_b1 << 4) | uc_b2;
uc_b2 = (uc_b3 << 4) | uc_b4;
uchar2 = (uc_b1 << 8) | uc_b2;
uchar = 0x010000 | ((uchar & 0x3FF) << 10) | (uchar2 & 0x3FF);
}
if (sizeof (json_char) >= sizeof (json_uchar) || (uchar <= 0x7F))
{
string_add ((json_char) uchar);
break;
}
if (uchar <= 0x7FF)
{
if (state.first_pass)
string_length += 2;
else
{ string [string_length ++] = 0xC0 | (uchar >> 6);
string [string_length ++] = 0x80 | (uchar & 0x3F);
}
break;
}
if (uchar <= 0xFFFF) {
if (state.first_pass)
string_length += 3;
else
{ string [string_length ++] = 0xE0 | (uchar >> 12);
string [string_length ++] = 0x80 | ((uchar >> 6) & 0x3F);
string [string_length ++] = 0x80 | (uchar & 0x3F);
}
break;
}
if (state.first_pass)
string_length += 4;
else
{ string [string_length ++] = 0xF0 | (uchar >> 18);
string [string_length ++] = 0x80 | ((uchar >> 12) & 0x3F);
string [string_length ++] = 0x80 | ((uchar >> 6) & 0x3F);
string [string_length ++] = 0x80 | (uchar & 0x3F);
}
break;
default:
string_add (b);
};
continue;
}
if (b == '\\')
{
flags |= flag_escaped;
continue;
}
if (b == '"')
{
if (!state.first_pass)
string [string_length] = 0;
flags &= ~ flag_string;
string = 0;
switch (top->type)
{
case json_string:
top->u.string.length = string_length;
flags |= flag_next;
break;
case json_object:
if (state.first_pass)
(*(json_char **) &top->u.object.values) += string_length + 1;
else
{
top->u.object.values [top->u.object.length].name
= (json_char *) top->_reserved.object_mem;
top->u.object.values [top->u.object.length].name_length
= string_length;
(*(json_char **) &top->_reserved.object_mem) += string_length + 1;
}
flags |= flag_seek_value | flag_need_colon;
continue;
default:
break;
};
}
else
{
string_add (b);
continue;
}
}
if (state.settings.settings & json_enable_comments)
{
if (flags & (flag_line_comment | flag_block_comment))
{
if (flags & flag_line_comment)
{
if (b == '\r' || b == '\n' || !b)
{
flags &= ~ flag_line_comment;
-- state.ptr; /* so null can be reproc'd */
}
continue;
}
if (flags & flag_block_comment)
{
if (!b)
{ sprintf (error, "%d:%d: Unexpected EOF in block comment", line_and_col);
goto e_failed;
}
if (b == '*' && state.ptr < (end - 1) && state.ptr [1] == '/')
{
flags &= ~ flag_block_comment;
++ state.ptr; /* skip closing sequence */
}
continue;
}
}
else if (b == '/')
{
if (! (flags & (flag_seek_value | flag_done)) && top->type != json_object)
{ sprintf (error, "%d:%d: Comment not allowed here", line_and_col);
goto e_failed;
}
if (++ state.ptr == end)
{ sprintf (error, "%d:%d: EOF unexpected", line_and_col);
goto e_failed;
}
switch (b = *state.ptr)
{
case '/':
flags |= flag_line_comment;
continue;
case '*':
flags |= flag_block_comment;
continue;
default:
sprintf (error, "%d:%d: Unexpected `%c` in comment opening sequence", line_and_col, b);
goto e_failed;
};
}
}
if (flags & flag_done)
{
if (!b)
break;
switch (b)
{
whitespace:
continue;
default:
sprintf (error, "%d:%d: Trailing garbage: `%c`",
state.cur_line, state.cur_col, b);
goto e_failed;
};
}
if (flags & flag_seek_value)
{
switch (b)
{
whitespace:
continue;
case ']':
if (top && top->type == json_array)
flags = (flags & ~ (flag_need_comma | flag_seek_value)) | flag_next;
else
{ sprintf (error, "%d:%d: Unexpected ]", line_and_col);
goto e_failed;
}
break;
default:
if (flags & flag_need_comma)
{
if (b == ',')
{ flags &= ~ flag_need_comma;
continue;
}
else
{
sprintf (error, "%d:%d: Expected , before %c",
state.cur_line, state.cur_col, b);
goto e_failed;
}
}
if (flags & flag_need_colon)
{
if (b == ':')
{ flags &= ~ flag_need_colon;
continue;
}
else
{
sprintf (error, "%d:%d: Expected : before %c",
state.cur_line, state.cur_col, b);
goto e_failed;
}
}
flags &= ~ flag_seek_value;
switch (b)
{
case '{':
if (!new_value (&state, &top, &root, &alloc, json_object))
goto e_alloc_failure;
continue;
case '[':
if (!new_value (&state, &top, &root, &alloc, json_array))
goto e_alloc_failure;
flags |= flag_seek_value;
continue;
case '"':
if (!new_value (&state, &top, &root, &alloc, json_string))
goto e_alloc_failure;
flags |= flag_string;
string = top->u.string.ptr;
string_length = 0;
continue;
case 't':
if ((end - state.ptr) < 3 || *(++ state.ptr) != 'r' ||
*(++ state.ptr) != 'u' || *(++ state.ptr) != 'e')
{
goto e_unknown_value;
}
if (!new_value (&state, &top, &root, &alloc, json_boolean))
goto e_alloc_failure;
top->u.boolean = 1;
flags |= flag_next;
break;
case 'f':
if ((end - state.ptr) < 4 || *(++ state.ptr) != 'a' ||
*(++ state.ptr) != 'l' || *(++ state.ptr) != 's' ||
*(++ state.ptr) != 'e')
{
goto e_unknown_value;
}
if (!new_value (&state, &top, &root, &alloc, json_boolean))
goto e_alloc_failure;
flags |= flag_next;
break;
case 'n':
if ((end - state.ptr) < 3 || *(++ state.ptr) != 'u' ||
*(++ state.ptr) != 'l' || *(++ state.ptr) != 'l')
{
goto e_unknown_value;
}
if (!new_value (&state, &top, &root, &alloc, json_null))
goto e_alloc_failure;
flags |= flag_next;
break;
default:
if (isdigit (b) || b == '-')
{
if (!new_value (&state, &top, &root, &alloc, json_integer))
goto e_alloc_failure;
if (!state.first_pass)
{
while (isdigit (b) || b == '+' || b == '-'
|| b == 'e' || b == 'E' || b == '.')
{
if ( (++ state.ptr) == end)
{
b = 0;
break;
}
b = *state.ptr;
}
flags |= flag_next | flag_reproc;
break;
}
flags &= ~ (flag_num_negative | flag_num_e |
flag_num_e_got_sign | flag_num_e_negative |
flag_num_zero);
num_digits = 0;
num_fraction = 0;
num_e = 0;
if (b != '-')
{
flags |= flag_reproc;
break;
}
flags |= flag_num_negative;
continue;
}
else
{ sprintf (error, "%d:%d: Unexpected %c when seeking value", line_and_col, b);
goto e_failed;
}
};
};
}
else
{
switch (top->type)
{
case json_object:
switch (b)
{
whitespace:
continue;
case '"':
if (flags & flag_need_comma)
{ sprintf (error, "%d:%d: Expected , before \"", line_and_col);
goto e_failed;
}
flags |= flag_string;
string = (json_char *) top->_reserved.object_mem;
string_length = 0;
break;
case '}':
flags = (flags & ~ flag_need_comma) | flag_next;
break;
case ',':
if (flags & flag_need_comma)
{
flags &= ~ flag_need_comma;
break;
}
default:
sprintf (error, "%d:%d: Unexpected `%c` in object", line_and_col, b);
goto e_failed;
};
break;
case json_integer:
case json_double:
if (isdigit (b))
{
++ num_digits;
if (top->type == json_integer || flags & flag_num_e)
{
if (! (flags & flag_num_e))
{
if (flags & flag_num_zero)
{ sprintf (error, "%d:%d: Unexpected `0` before `%c`", line_and_col, b);
goto e_failed;
}
if (num_digits == 1 && b == '0')
flags |= flag_num_zero;
}
else
{
flags |= flag_num_e_got_sign;
num_e = (num_e * 10) + (b - '0');
continue;
}
top->u.integer = (top->u.integer * 10) + (b - '0');
continue;
}
num_fraction = (num_fraction * 10) + (b - '0');
continue;
}
if (b == '+' || b == '-')
{
if ( (flags & flag_num_e) && !(flags & flag_num_e_got_sign))
{
flags |= flag_num_e_got_sign;
if (b == '-')
flags |= flag_num_e_negative;
continue;
}
}
else if (b == '.' && top->type == json_integer)
{
if (!num_digits)
{ sprintf (error, "%d:%d: Expected digit before `.`", line_and_col);
goto e_failed;
}
top->type = json_double;
top->u.dbl = (double) top->u.integer;
num_digits = 0;
continue;
}
if (! (flags & flag_num_e))
{
if (top->type == json_double)
{
if (!num_digits)
{ sprintf (error, "%d:%d: Expected digit after `.`", line_and_col);
goto e_failed;
}
top->u.dbl += ((double) num_fraction) / (pow (10.0, (double) num_digits));
}
if (b == 'e' || b == 'E')
{
flags |= flag_num_e;
if (top->type == json_integer)
{
top->type = json_double;
top->u.dbl = (double) top->u.integer;
}
num_digits = 0;
flags &= ~ flag_num_zero;
continue;
}
}
else
{
if (!num_digits)
{ sprintf (error, "%d:%d: Expected digit after `e`", line_and_col);
goto e_failed;
}
top->u.dbl *= pow (10.0, (double)
(flags & flag_num_e_negative ? - num_e : num_e));
}
if (flags & flag_num_negative)
{
if (top->type == json_integer)
top->u.integer = - top->u.integer;
else
top->u.dbl = - top->u.dbl;
}
flags |= flag_next | flag_reproc;
break;
default:
break;
};
}
if (flags & flag_reproc)
{
flags &= ~ flag_reproc;
-- state.ptr;
}
if (flags & flag_next)
{
flags = (flags & ~ flag_next) | flag_need_comma;
if (!top->parent)
{
/* root value done */
flags |= flag_done;
continue;
}
if (top->parent->type == json_array)
flags |= flag_seek_value;
if (!state.first_pass)
{
json_value * parent = top->parent;
switch (parent->type)
{
case json_object:
parent->u.object.values
[parent->u.object.length].value = top;
break;
case json_array:
parent->u.array.values
[parent->u.array.length] = top;
break;
default:
break;
};
}
if ( (++ top->parent->u.array.length) > state.uint_max)
goto e_overflow;
top = top->parent;
continue;
}
}
alloc = root;
}
return root;
e_unknown_value:
sprintf (error, "%d:%d: Unknown value", line_and_col);
goto e_failed;
e_alloc_failure:
strcpy (error, "Memory allocation failure");
goto e_failed;
e_overflow:
sprintf (error, "%d:%d: Too long (caught overflow)", line_and_col);
goto e_failed;
e_failed:
if (error_buf)
{
if (*error)
strcpy (error_buf, error);
else
strcpy (error_buf, "Unknown error");
}
if (state.first_pass)
alloc = root;
while (alloc)
{
top = alloc->_reserved.next_alloc;
state.settings.mem_free (alloc, state.settings.user_data);
alloc = top;
}
if (!state.first_pass)
json_value_free_ex (&state.settings, root);
return 0;
}
json_value * json_parse (const json_char * json, size_t length)
{
json_settings settings = { 0 };
return json_parse_ex (&settings, json, length, 0);
}
void json_value_free_ex (json_settings * settings, json_value * value)
{
json_value * cur_value;
if (!value)
return;
value->parent = 0;
while (value)
{
switch (value->type)
{
case json_array:
if (!value->u.array.length)
{
settings->mem_free (value->u.array.values, settings->user_data);
break;
}
value = value->u.array.values [-- value->u.array.length];
continue;
case json_object:
if (!value->u.object.length)
{
settings->mem_free (value->u.object.values, settings->user_data);
break;
}
value = value->u.object.values [-- value->u.object.length].value;
continue;
case json_string:
settings->mem_free (value->u.string.ptr, settings->user_data);
break;
default:
break;
};
cur_value = value;
value = value->parent;
settings->mem_free (cur_value, settings->user_data);
}
}
void json_value_free (json_value * value)
{
json_settings settings = { 0 };
settings.mem_free = default_free;
json_value_free_ex (&settings, value);
}
json.h
/* vim: set et ts=3 sw=3 sts=3 ft=c:
*
* Copyright (C) 2012, 2013, 2014 James McLaughlin et al. All rights reserved.
* https://github.com/udp/json-parser
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _JSON_H
#define _JSON_H
#ifndef json_char
#define json_char char
#endif
#ifndef json_int_t
#ifndef _MSC_VER
#include <inttypes.h>
#define json_int_t int64_t
#else
#define json_int_t __int64
#endif
#endif
#include <stdlib.h>
#ifdef __cplusplus
#include <string.h>
extern "C"
{
#endif
typedef struct
{
unsigned long max_memory;
int settings;
/* Custom allocator support (leave null to use malloc/free)
*/
void * (* mem_alloc) (size_t, int zero, void * user_data);
void (* mem_free) (void *, void * user_data);
void * user_data; /* will be passed to mem_alloc and mem_free */
size_t value_extra; /* how much extra space to allocate for values? */
} json_settings;
#define json_enable_comments 0x01
typedef enum
{
json_none,
json_object,
json_array,
json_integer,
json_double,
json_string,
json_boolean,
json_null
} json_type;
extern const struct _json_value json_value_none;
typedef struct _json_object_entry
{
json_char * name;
unsigned int name_length;
struct _json_value * value;
} json_object_entry;
typedef struct _json_value
{
struct _json_value * parent;
json_type type;
union
{
int boolean;
json_int_t integer;
double dbl;
struct
{
unsigned int length;
json_char * ptr; /* null terminated */
} string;
struct
{
unsigned int length;
json_object_entry * values;
#if defined(__cplusplus) && __cplusplus >= 201103L
decltype(values) begin () const
{ return values;
}
decltype(values) end () const
{ return values + length;
}
#endif
} object;
struct
{
unsigned int length;
struct _json_value ** values;
#if defined(__cplusplus) && __cplusplus >= 201103L
decltype(values) begin () const
{ return values;
}
decltype(values) end () const
{ return values + length;
}
#endif
} array;
} u;
union
{
struct _json_value * next_alloc;
void * object_mem;
} _reserved;
#ifdef JSON_TRACK_SOURCE
/* Location of the value in the source JSON
*/
unsigned int line, col;
#endif
/* Some C++ operator sugar */
#ifdef __cplusplus
public:
inline _json_value ()
{ memset (this, 0, sizeof (_json_value));
}
inline const struct _json_value &operator [] (int index) const
{
if (type != json_array || index < 0
|| ((unsigned int) index) >= u.array.length)
{
return json_value_none;
}
return *u.array.values [index];
}
inline const struct _json_value &operator [] (const char * index) const
{
if (type != json_object)
return json_value_none;
for (unsigned int i = 0; i < u.object.length; ++ i)
if (!strcmp (u.object.values [i].name, index))
return *u.object.values [i].value;
return json_value_none;
}
inline operator const char * () const
{
switch (type)
{
case json_string:
return u.string.ptr;
default:
return "";
};
}
inline operator json_int_t () const
{
switch (type)
{
case json_integer:
return u.integer;
case json_double:
return (json_int_t) u.dbl;
default:
return 0;
};
}
inline operator bool () const
{
if (type != json_boolean)
return false;
return u.boolean != 0;
}
inline operator double () const
{
switch (type)
{
case json_integer:
return (double) u.integer;
case json_double:
return u.dbl;
default:
return 0;
};
}
#endif
} json_value;
json_value * json_parse (const json_char * json,
size_t length);
#define json_error_max 128
json_value * json_parse_ex (json_settings * settings,
const json_char * json,
size_t length,
char * error);
void json_value_free (json_value *);
/* Not usually necessary, unless you used a custom mem_alloc and now want to
* use a custom mem_free.
*/
void json_value_free_ex (json_settings * settings,
json_value *);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
//example.c
int g_enable_adb = 0x01;
void dbg_print_buf(char *str, unsigned char *buff, int len)
{
int i,slen,data_Len;
int tmpLen;
int send_cnt,send_remain;
char sbuf[7000];
char tmp_sbuf[2020];
if( !g_enable_adb ){
return;
}
slen = strlen(str);
//描述串的长度
//LOGI( "slen = %d", slen );
data_Len = len*3;
//待打印数据的字节数扩展后的字符数 每个字节占3字符-->" %02X"
//LOGI( "data_Len3 = %d", data_Len );
tmpLen = len;
if( len < 0 ){
return;
}
if( data_Len + slen > 6998 ){
tmpLen = (6998 - slen)/3;
print_log("dbg_print_buf len outside, max,1024:%s", str);
//return;
}
memset(sbuf, 0x00, sizeof(sbuf));
strcpy( sbuf, str );
for( i=0; i<tmpLen; i++ ){
sprintf( &sbuf[slen+i*3], " %02X", buff[i] );
}
tmpLen = strlen(sbuf);
//LOGI( "tmpLen = %d", tmpLen );
send_cnt = tmpLen /1023;
send_remain = tmpLen %1023;
i = 0x00;
for( i=0x00; i<send_cnt; i++ ){
memset( tmp_sbuf, 0x00, sizeof(tmp_sbuf) );
memcpy( tmp_sbuf, &sbuf[i*1023], 1023 );
print_log( "%s", tmp_sbuf );
}
memset( tmp_sbuf, 0x00, sizeof(tmp_sbuf) );
memcpy( tmp_sbuf, &sbuf[i*1023], send_remain );
print_log( "%s", tmp_sbuf );
#if 0
addDebugInfo(env, obj, sbuf);
#else
//LOGI("%s", sbuf);
//print_log("%s", sbuf);
#endif
}
static void get_depth_shift(int depth, char *_depth)
{
int j = 0;
for (j=0; j < depth; j++) {
//json_printf(" ");
_depth[j] = ' ';
}
_depth[j] = 0;
//json_printf("%s", _depth);
}
static void process_value(json_value* value, int depth);
static void process_object(json_value* value, int depth)
{
int length, x;
if (value == NULL) {
return;
}
length = value->u.object.length;
for (x = 0; x < length; x++) {
char _depth[256] = {0};
//print_depth_shift(depth);
get_depth_shift(depth, _depth);
json_printf("%sobject[%d].name = %s", _depth, x, value->u.object.values[x].name);
process_value(value->u.object.values[x].value, depth+1);
}
}
void add_decode_buff( char *in_str )
{
int buff_len;
buff_len = strlen(in_str);
if( (buff_len+g_decode_index) >= sizeof(g_decode_json) ){
return;
}
memcpy( &g_decode_json[g_decode_index], in_str, buff_len );
g_decode_index = g_decode_index + buff_len;
}
void init_decode_buff( void )
{
memset( &g_decode_json[0], 0x00, sizeof(g_decode_json) );
g_decode_index = 0x00;
}
void end_of_decode_buff(void)
{
int buff_len;
buff_len = strlen( g_decode_json );
if( buff_len == 1 ){
g_decode_json[1] = '}';
return;
}
if( g_decode_json[buff_len-1] == ',' ){
g_decode_json[buff_len-1] = '}';
}
}
static void process_object_dp(json_value* value, int depth)
{
int length, x;
char tmp_buff[256];
int buff_len;
if( value == NULL ){
return;
}
length = value->u.object.length;
print_log( "object length = %d", length );
for( x=0; x<length; x++ ){
char _depth[256] = {0};
//print_depth_shift(depth);
get_depth_shift(depth, _depth);
json_printf("%sobject[%d].name = %s", _depth, x, value->u.object.values[x].name);
print_log("%sobject[%d].name = %s", _depth, x, value->u.object.values[x].name);
memset( tmp_buff, 0x00, sizeof(tmp_buff) );
sprintf( tmp_buff, "\"%s\":", value->u.object.values[x].name );
add_decode_buff( tmp_buff );
process_value_dp(value->u.object.values[x].value, depth+1);
}
}
static void process_array(json_value* value, int depth)
{
int length, x;
if (value == NULL) {
return;
}
length = value->u.array.length;
json_printf("array");
for (x = 0; x < length; x++) {
process_value(value->u.array.values[x], depth);
}
}
static void process_value(json_value* value, int depth)
{
int j;
char _depth[256] = {0};
if (value == NULL) {
return;
}
if (value->type != json_object) {
//char _depth[256];
get_depth_shift(depth, _depth);
//print_depth_shift(depth);
}
switch (value->type) {
case json_none:
json_printf("%s%s", _depth, "none");
break;
case json_object:
process_object(value, depth+1);
break;
case json_array:
process_array(value, depth+1);
break;
case json_integer:
json_printf("%sint: %d", _depth, value->u.integer);
//printf("int: %10 \n", value->u.integer);
//printf("int: %d \n", value->u.integer);
break;
case json_double:
json_printf("%sdouble: %f", _depth, value->u.dbl);
break;
case json_string:
json_printf("%sstring: %s", _depth, value->u.string.ptr);
break;
case json_boolean:
json_printf("%sbool: %d", _depth, value->u.boolean);
break;
}
}
static void process_value_dp( json_value* value, int depth )
{
int j;
char _depth[256] = {0};
char tmp_buff[256];
int buff_len;
if( value == NULL ){
return;
}
if( value->type != json_object ){
//char _depth[256];
get_depth_shift(depth, _depth);
//print_depth_shift(depth);
}
print_log( "value->type = %d", value->type );
switch( value->type ) {
case json_none:
json_printf("%s%s", _depth, "none");
break;
case json_object:
process_object_dp(value, depth+1);
break;
case json_array:
process_array(value, depth+1);
break;
case json_integer:
json_printf("%sint: %d", _depth, value->u.integer);
print_log("%sint: %d", _depth, value->u.integer);
memset( tmp_buff, 0x00, sizeof(tmp_buff) );
sprintf( tmp_buff, "%d,", value->u.integer );
add_decode_buff(tmp_buff);
//printf("int: %10 \n", value->u.integer);
//printf("int: %d \n", value->u.integer);
break;
case json_double:
json_printf("%sdouble: %f", _depth, value->u.dbl);
break;
case json_string:
json_printf("%sstring: %s", _depth, value->u.string.ptr);
print_log("%sstring: %s", _depth, value->u.string.ptr);
memset( tmp_buff, 0x00, sizeof(tmp_buff) );
sprintf( tmp_buff, "\"%s\",", value->u.string.ptr );
add_decode_buff(tmp_buff);
break;
case json_boolean:
json_printf("%sbool: %d", _depth, value->u.boolean);
break;
}
}
static void getStringValue(json_value* value, int depth, char *_value)
{
int j;
char _depth[256] = { 0 };
if (value == NULL) {
return;
}
if (value->type != json_object) {
//char _depth[256];
get_depth_shift(depth, _depth);
//print_depth_shift(depth);
}
switch (value->type) {
case json_none:
json_printf("%s%s", _depth, "none");
break;
case json_object:
process_object(value, depth + 1);
break;
case json_array:
process_array(value, depth + 1);
break;
case json_integer:
//json_printf("%sint: %d", _depth, value->u.integer);
sprintf(_value, "%d", value->u.integer);
break;
case json_double:
//json_printf("%sdouble: %f", _depth, value->u.dbl);
sprintf(_value, "%f", value->u.dbl);
break;
case json_string:
//json_printf("%sstring: %s", _depth, value->u.string.ptr);
sprintf(_value, "%s", value->u.string.ptr);
break;
case json_boolean:
//json_printf("%sbool: %d", _depth, value->u.boolean);
sprintf(_value, "%d", value->u.boolean);
break;
}
}
static void getStringValue_dp(json_value* value, int depth, char *_value)
{
int j;
char _depth[256] = { 0 };
if (value == NULL) {
return;
}
if (value->type != json_object) {
//char _depth[256];
get_depth_shift(depth, _depth);
//print_depth_shift(depth);
}
print_log( "getStringValue_dp value->type = %d", value->type );
switch (value->type) {
case json_none:
json_printf("%s%s", _depth, "none");
break;
case json_object:
process_object_dp(value, depth + 1);
break;
case json_array:
process_array(value, depth + 1);
break;
case json_integer:
//json_printf("%sint: %d", _depth, value->u.integer);
sprintf(_value, "%d", value->u.integer);
break;
case json_double:
//json_printf("%sdouble: %f", _depth, value->u.dbl);
sprintf(_value, "%f", value->u.dbl);
break;
case json_string:
//json_printf("%sstring: %s", _depth, value->u.string.ptr);
sprintf(_value, "%s", value->u.string.ptr);
break;
case json_boolean:
//json_printf("%sbool: %d", _depth, value->u.boolean);
sprintf(_value, "%d", value->u.boolean);
break;
}
}
static void getObjectValue(json_value* value, int depth, char *_name, char *_value)
{
int length, x;
if (value == NULL) {
return;
}
length = value->u.object.length;
//print_log("_name = %s", _name);
//print_log("_value = %s", _value);
//print_log("depth = %d", depth);
//print_log("length = %d", length);
for (x = 0; x < length; x++) {
char _depth[256] = { 0 };
//print_depth_shift(depth);
get_depth_shift(depth, _depth);
//json_printf("%sobject[%d].name = %s", _depth, x, value->u.object.values[x].name);
//process_value(value->u.object.values[x].value, depth + 1);
if (strcmp(value->u.object.values[x].name, _name) == 0)
{
//strcpy(_value, value->u.object.values[x].value);
getStringValue(value->u.object.values[x].value, depth + 1, _value);
return;
}
}
}
static void getObjectValue_dp(json_value* value, int depth, char *_name, char *_value)
{
int length, x;
if (value == NULL) {
return;
}
length = value->u.object.length;
print_log(" pd _name = %s", _name);
print_log("_value = %s", _value);
print_log("depth = %d", depth);
print_log("length = %d", length);
for (x = 0; x < length; x++) {
char _depth[256] = { 0 };
//print_depth_shift(depth);
get_depth_shift(depth, _depth);
//json_printf("%sobject[%d].name = %s", _depth, x, value->u.object.values[x].name);
//process_value(value->u.object.values[x].value, depth + 1);
print_log("dpxv- %sobject[%d].name = %s", _depth, x, value->u.object.values[x].name);
if( strcmp(value->u.object.values[x].name, _name) == 0 ){
//strcpy(_value, value->u.object.values[x].value);
getStringValue_dp(value->u.object.values[x].value, depth + 1, _value);
return;
}
}
}
int getJsonValue(char *_json_str, char *_name, char *_value)
{
//printf("%s\n", _json_str);
//print_buf("--------------------------------\n\n\n\n", NULL, 0);
//print_buf("--------------------------------decode JSON\n\n", NULL, 0);
json_char *json = (json_char*)_json_str;
json_value *value = json_parse(json, strlen(_json_str));
if( value == NULL ){
print_log("Unable to parse data");
return 1;
}
getObjectValue(value, 0, _name, _value);
//print_log("_json_str = %s", _json_str);
//print_log("_name = %s", _name);
//print_log("_value = %s", _value);
json_value_free(value);
return 0;
}
int getJsonValue_dp( char *_json_str, char *_name, char *_value )
{
//printf("%s\n", _json_str);
//print_buf("--------------------------------\n\n\n\n", NULL, 0);
//print_buf("--------------------------------decode JSON\n\n", NULL, 0);
json_char *json = (json_char*)_json_str;
json_value *value = json_parse(json, strlen(_json_str));
if( value == NULL ){
print_log("Unable to parse data");
return 1;
}
getObjectValue_dp(value, 0, _name, _value);
print_log("_json_str = %s", _json_str);
print_log("_name = %s", _name);
print_log("_value = %s", _value);
json_value_free(value);
return 0;
}
使用
_ret_ = getJsonValue_dp(_gjson, "data", data_buff);