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cJSON.c
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2190 lines (2010 loc) · 47.4 KB
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/*
Copyright (c) 2009 Dave Gamble
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/* cJSON */
/* JSON parser in C. */
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <float.h>
#include <limits.h>
#include <ctype.h>
#include "cJSON.h"
static const char *global_ep;
const char *cJSON_GetErrorPtr(void)
{
return global_ep;
}
/* case insensitive strcmp */
static int cJSON_strcasecmp(const char *s1, const char *s2)
{
if (!s1)
{
return (s1 == s2) ? 0 : 1; /* both NULL? */
}
if (!s2)
{
return 1;
}
for(; tolower(*s1) == tolower(*s2); ++s1, ++s2)
{
if (*s1 == 0)
{
return 0;
}
}
return tolower(*(const unsigned char *)s1) - tolower(*(const unsigned char *)s2);
}
static void *(*cJSON_malloc)(size_t sz) = malloc;
static void (*cJSON_free)(void *ptr) = free;
static char* cJSON_strdup(const char* str)
{
size_t len;
char* copy;
len = strlen(str) + 1;
if (!(copy = (char*)cJSON_malloc(len)))
{
return 0;
}
memcpy(copy, str, len);
return copy;
}
void cJSON_InitHooks(cJSON_Hooks* hooks)
{
if (!hooks)
{
/* Reset hooks */
cJSON_malloc = malloc;
cJSON_free = free;
return;
}
cJSON_malloc = (hooks->malloc_fn) ? hooks->malloc_fn : malloc;
cJSON_free = (hooks->free_fn) ? hooks->free_fn : free;
}
/* Internal constructor. */
static cJSON *cJSON_New_Item(void)
{
cJSON* node = (cJSON*)cJSON_malloc(sizeof(cJSON));
if (node)
{
memset(node, 0, sizeof(cJSON));
}
return node;
}
/* Delete a cJSON structure. */
void cJSON_Delete(cJSON *c)
{
cJSON *next;
while (c)
{
next = c->next;
if (!(c->type & cJSON_IsReference) && c->child)
{
cJSON_Delete(c->child);
}
if (!(c->type & cJSON_IsReference) && c->valuestring)
{
cJSON_free(c->valuestring);
}
if (!(c->type & cJSON_StringIsConst) && c->string)
{
cJSON_free(c->string);
}
cJSON_free(c);
c = next;
}
}
/* Parse the input text to generate a number, and populate the result into item. */
static const char *parse_number(cJSON *item, const char *num)
{
double n = 0;
double sign = 1;
double scale = 0;
int subscale = 0;
int signsubscale = 1;
/* Has sign? */
if (*num == '-')
{
sign = -1;
num++;
}
/* is zero */
if (*num == '0')
{
num++;
}
/* Number? */
if ((*num >= '1') && (*num <= '9'))
{
do
{
n = (n * 10.0) + (*num++ - '0');
}
while ((*num >= '0') && (*num<='9'));
}
/* Fractional part? */
if ((*num == '.') && (num[1] >= '0') && (num[1] <= '9'))
{
num++;
do
{
n = (n *10.0) + (*num++ - '0');
scale--;
} while ((*num >= '0') && (*num <= '9'));
}
/* Exponent? */
if ((*num == 'e') || (*num == 'E'))
{
num++;
/* With sign? */
if (*num == '+')
{
num++;
}
else if (*num == '-')
{
signsubscale = -1;
num++;
}
/* Number? */
while ((*num>='0') && (*num<='9'))
{
subscale = (subscale * 10) + (*num++ - '0');
}
}
/* number = +/- number.fraction * 10^+/- exponent */
n = sign * n * pow(10.0, (scale + subscale * signsubscale));
item->valuedouble = n;
item->valueint = (int)n;
item->type = cJSON_Number;
return num;
}
/* calculate the next largest power of 2 */
static int pow2gt (int x)
{
--x;
x |= x >> 1;
x |= x >> 2;
x |= x >> 4;
x |= x >> 8;
x |= x >> 16;
return x + 1;
}
typedef struct
{
char *buffer;
int length;
int offset;
} printbuffer;
/* realloc printbuffer if necessary to have at least "needed" bytes more */
static char* ensure(printbuffer *p, int needed)
{
char *newbuffer;
int newsize;
if (!p || !p->buffer)
{
return 0;
}
needed += p->offset;
if (needed <= p->length)
{
return p->buffer + p->offset;
}
newsize = pow2gt(needed);
newbuffer = (char*)cJSON_malloc(newsize);
if (!newbuffer)
{
cJSON_free(p->buffer);
p->length = 0;
p->buffer = 0;
return 0;
}
if (newbuffer)
{
memcpy(newbuffer, p->buffer, p->length);
}
cJSON_free(p->buffer);
p->length = newsize;
p->buffer = newbuffer;
return newbuffer + p->offset;
}
/* calculate the new length of the string in a printbuffer */
static int update(const printbuffer *p)
{
char *str;
if (!p || !p->buffer)
{
return 0;
}
str = p->buffer + p->offset;
return p->offset + strlen(str);
}
/* Render the number nicely from the given item into a string. */
static char *print_number(const cJSON *item, printbuffer *p)
{
char *str = 0;
double d = item->valuedouble;
/* special case for 0. */
if (d == 0)
{
if (p)
{
str = ensure(p, 2);
}
else
{
str = (char*)cJSON_malloc(2);
}
if (str)
{
strcpy(str,"0");
}
}
/* value is an int */
else if ((fabs(((double)item->valueint) - d) <= DBL_EPSILON) && (d <= INT_MAX) && (d >= INT_MIN))
{
if (p)
{
str = ensure(p, 21);
}
else
{
/* 2^64+1 can be represented in 21 chars. */
str = (char*)cJSON_malloc(21);
}
if (str)
{
sprintf(str, "%d", item->valueint);
}
}
/* value is a floating point number */
else
{
if (p)
{
/* This is a nice tradeoff. */
str = ensure(p, 64);
}
else
{
/* This is a nice tradeoff. */
str=(char*)cJSON_malloc(64);
}
if (str)
{
/* This checks for NaN and Infinity */
if ((d * 0) != 0)
{
sprintf(str, "null");
}
else if ((fabs(floor(d) - d) <= DBL_EPSILON) && (fabs(d) < 1.0e60))
{
sprintf(str, "%.0f", d);
}
else if ((fabs(d) < 1.0e-6) || (fabs(d) > 1.0e9))
{
sprintf(str, "%e", d);
}
else
{
sprintf(str, "%f", d);
}
}
}
return str;
}
/* parse 4 digit hexadecimal number */
static unsigned parse_hex4(const char *str)
{
unsigned h = 0;
/* first digit */
if ((*str >= '0') && (*str <= '9'))
{
h += (*str) - '0';
}
else if ((*str >= 'A') && (*str <= 'F'))
{
h += 10 + (*str) - 'A';
}
else if ((*str >= 'a') && (*str <= 'f'))
{
h += 10 + (*str) - 'a';
}
else /* invalid */
{
return 0;
}
/* second digit */
h = h << 4;
str++;
if ((*str >= '0') && (*str <= '9'))
{
h += (*str) - '0';
}
else if ((*str >= 'A') && (*str <= 'F'))
{
h += 10 + (*str) - 'A';
}
else if ((*str >= 'a') && (*str <= 'f'))
{
h += 10 + (*str) - 'a';
}
else /* invalid */
{
return 0;
}
/* third digit */
h = h << 4;
str++;
if ((*str >= '0') && (*str <= '9'))
{
h += (*str) - '0';
}
else if ((*str >= 'A') && (*str <= 'F'))
{
h += 10 + (*str) - 'A';
}
else if ((*str >= 'a') && (*str <= 'f'))
{
h += 10 + (*str) - 'a';
}
else /* invalid */
{
return 0;
}
/* fourth digit */
h = h << 4;
str++;
if ((*str >= '0') && (*str <= '9'))
{
h += (*str) - '0';
}
else if ((*str >= 'A') && (*str <= 'F'))
{
h += 10 + (*str) - 'A';
}
else if ((*str >= 'a') && (*str <= 'f'))
{
h += 10 + (*str) - 'a';
}
else /* invalid */
{
return 0;
}
return h;
}
/* first bytes of UTF8 encoding for a given length in bytes */
static const unsigned char firstByteMark[7] =
{
0x00, /* should never happen */
0x00, /* 0xxxxxxx */
0xC0, /* 110xxxxx */
0xE0, /* 1110xxxx */
0xF0, /* 11110xxx */
0xF8,
0xFC
};
/* Parse the input text into an unescaped cstring, and populate item. */
static const char *parse_string(cJSON *item, const char *str, const char **ep)
{
const char *ptr = str + 1;
const char *end_ptr =str + 1;
char *ptr2;
char *out;
int len = 0;
unsigned uc;
unsigned uc2;
/* not a string! */
if (*str != '\"')
{
*ep = str;
return 0;
}
while ((*end_ptr != '\"') && *end_ptr && ++len)
{
if (*end_ptr++ == '\\')
{
if (*end_ptr == '\0')
{
/* prevent buffer overflow when last input character is a backslash */
return 0;
}
/* Skip escaped quotes. */
end_ptr++;
}
}
/* This is at most how long we need for the string, roughly. */
out = (char*)cJSON_malloc(len + 1);
if (!out)
{
return 0;
}
item->valuestring = out; /* assign here so out will be deleted during cJSON_Delete() later */
item->type = cJSON_String;
ptr = str + 1;
ptr2 = out;
/* loop through the string literal */
while (ptr < end_ptr)
{
if (*ptr != '\\')
{
*ptr2++ = *ptr++;
}
/* escape sequence */
else
{
ptr++;
switch (*ptr)
{
case 'b':
*ptr2++ = '\b';
break;
case 'f':
*ptr2++ = '\f';
break;
case 'n':
*ptr2++ = '\n';
break;
case 'r':
*ptr2++ = '\r';
break;
case 't':
*ptr2++ = '\t';
break;
case 'u':
/* transcode utf16 to utf8. See RFC2781 and RFC3629. */
uc = parse_hex4(ptr + 1); /* get the unicode char. */
ptr += 4;
if (ptr >= end_ptr)
{
/* invalid */
*ep = str;
return 0;
}
/* check for invalid. */
if (((uc >= 0xDC00) && (uc <= 0xDFFF)) || (uc == 0))
{
*ep = str;
return 0;
}
/* UTF16 surrogate pairs. */
if ((uc >= 0xD800) && (uc<=0xDBFF))
{
if ((ptr + 6) > end_ptr)
{
/* invalid */
*ep = str;
return 0;
}
if ((ptr[1] != '\\') || (ptr[2] != 'u'))
{
/* missing second-half of surrogate. */
*ep = str;
return 0;
}
uc2 = parse_hex4(ptr + 3);
ptr += 6; /* \uXXXX */
if ((uc2 < 0xDC00) || (uc2 > 0xDFFF))
{
/* invalid second-half of surrogate. */
*ep = str;
return 0;
}
/* calculate unicode codepoint from the surrogate pair */
uc = 0x10000 + (((uc & 0x3FF) << 10) | (uc2 & 0x3FF));
}
/* encode as UTF8
* takes at maximum 4 bytes to encode:
* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
len = 4;
if (uc < 0x80)
{
/* normal ascii, encoding 0xxxxxxx */
len = 1;
}
else if (uc < 0x800)
{
/* two bytes, encoding 110xxxxx 10xxxxxx */
len = 2;
}
else if (uc < 0x10000)
{
/* three bytes, encoding 1110xxxx 10xxxxxx 10xxxxxx */
len = 3;
}
ptr2 += len;
switch (len) {
case 4:
/* 10xxxxxx */
*--ptr2 = ((uc | 0x80) & 0xBF);
uc >>= 6;
case 3:
/* 10xxxxxx */
*--ptr2 = ((uc | 0x80) & 0xBF);
uc >>= 6;
case 2:
/* 10xxxxxx */
*--ptr2 = ((uc | 0x80) & 0xBF);
uc >>= 6;
case 1:
/* depending on the length in bytes this determines the
* encoding ofthe first UTF8 byte */
*--ptr2 = (uc | firstByteMark[len]);
}
ptr2 += len;
break;
default:
*ptr2++ = *ptr;
break;
}
ptr++;
}
}
*ptr2 = '\0';
if (*ptr == '\"')
{
ptr++;
}
return ptr;
}
/* Render the cstring provided to an escaped version that can be printed. */
static char *print_string_ptr(const char *str, printbuffer *p)
{
const char *ptr;
char *ptr2;
char *out;
int len = 0;
int flag = 0;
unsigned char token;
/* empty string */
if (!str)
{
if (p)
{
out = ensure(p, 3);
}
else
{
out = (char*)cJSON_malloc(3);
}
if (!out)
{
return 0;
}
strcpy(out, "\"\"");
return out;
}
/* set "flag" to 1 if something needs to be escaped */
for (ptr = str; *ptr; ptr++)
{
flag |= (((*ptr > 0) && (*ptr < 32)) /* unprintable characters */
|| (*ptr == '\"') /* double quote */
|| (*ptr == '\\')) /* backslash */
? 1
: 0;
}
/* no characters have to be escaped */
if (!flag)
{
len = ptr - str;
if (p)
{
out = ensure(p, len + 3);
}
else
{
out = (char*)cJSON_malloc(len + 3);
}
if (!out)
{
return 0;
}
ptr2 = out;
*ptr2++ = '\"';
strcpy(ptr2, str);
ptr2[len] = '\"';
ptr2[len + 1] = '\0';
return out;
}
ptr = str;
/* calculate additional space that is needed for escaping */
while ((token = *ptr) && ++len)
{
if (strchr("\"\\\b\f\n\r\t", token))
{
len++; /* +1 for the backslash */
}
else if (token < 32)
{
len += 5; /* +5 for \uXXXX */
}
ptr++;
}
if (p)
{
out = ensure(p, len + 3);
}
else
{
out = (char*)cJSON_malloc(len + 3);
}
if (!out)
{
return 0;
}
ptr2 = out;
ptr = str;
*ptr2++ = '\"';
/* copy the string */
while (*ptr)
{
if (((unsigned char)*ptr > 31) && (*ptr != '\"') && (*ptr != '\\'))
{
/* normal character, copy */
*ptr2++ = *ptr++;
}
else
{
/* character needs to be escaped */
*ptr2++ = '\\';
switch (token = *ptr++)
{
case '\\':
*ptr2++ = '\\';
break;
case '\"':
*ptr2++ = '\"';
break;
case '\b':
*ptr2++ = 'b';
break;
case '\f':
*ptr2++ = 'f';
break;
case '\n':
*ptr2++ = 'n';
break;
case '\r':
*ptr2++ = 'r';
break;
case '\t':
*ptr2++ = 't';
break;
default:
/* escape and print as unicode codepoint */
sprintf(ptr2, "u%04x", token);
ptr2 += 5;
break;
}
}
}
*ptr2++ = '\"';
*ptr2++ = '\0';
return out;
}
/* Invoke print_string_ptr (which is useful) on an item. */
static char *print_string(const cJSON *item, printbuffer *p)
{
return print_string_ptr(item->valuestring, p);
}
/* Predeclare these prototypes. */
static const char *parse_value(cJSON *item, const char *value, const char **ep);
static char *print_value(const cJSON *item, int depth, int fmt, printbuffer *p);
static const char *parse_array(cJSON *item, const char *value, const char **ep);
static char *print_array(const cJSON *item, int depth, int fmt, printbuffer *p);
static const char *parse_object(cJSON *item, const char *value, const char **ep);
static char *print_object(const cJSON *item, int depth, int fmt, printbuffer *p);
/* Utility to jump whitespace and cr/lf */
static const char *skip(const char *in)
{
while (in && *in && ((unsigned char)*in<=32))
{
in++;
}
return in;
}
/* Parse an object - create a new root, and populate. */
cJSON *cJSON_ParseWithOpts(const char *value, const char **return_parse_end, int require_null_terminated)
{
const char *end = 0;
/* use global error pointer if no specific one was given */
const char **ep = return_parse_end ? return_parse_end : &global_ep;
cJSON *c = cJSON_New_Item();
*ep = 0;
if (!c) /* memory fail */
{
return 0;
}
end = parse_value(c, skip(value), ep);
if (!end)
{
/* parse failure. ep is set. */
cJSON_Delete(c);
return 0;
}
/* if we require null-terminated JSON without appended garbage, skip and then check for a null terminator */
if (require_null_terminated)
{
end = skip(end);
if (*end)
{
cJSON_Delete(c);
*ep = end;
return 0;
}
}
if (return_parse_end)
{
*return_parse_end = end;
}
return c;
}
/* Default options for cJSON_Parse */
cJSON *cJSON_Parse(const char *value)
{
return cJSON_ParseWithOpts(value, 0, 0);
}
/* Render a cJSON item/entity/structure to text. */
char *cJSON_Print(const cJSON *item)
{
return print_value(item, 0, 1, 0);
}
char *cJSON_PrintUnformatted(const cJSON *item)
{
return print_value(item, 0, 0, 0);
}
char *cJSON_PrintBuffered(const cJSON *item, int prebuffer, int fmt)
{
printbuffer p;
p.buffer = (char*)cJSON_malloc(prebuffer);
p.length = prebuffer;
p.offset = 0;
return print_value(item, 0, fmt, &p);
}
/* Parser core - when encountering text, process appropriately. */
static const char *parse_value(cJSON *item, const char *value, const char **ep)
{
if (!value)
{
/* Fail on null. */
return 0;
}
/* parse the different types of values */
if (!strncmp(value, "null", 4))
{
item->type = cJSON_NULL;
return value + 4;
}
if (!strncmp(value, "false", 5))
{
item->type = cJSON_False;
return value + 5;
}
if (!strncmp(value, "true", 4))
{
item->type = cJSON_True;
item->valueint = 1;
return value + 4;
}
if (*value == '\"')
{
return parse_string(item, value, ep);
}
if ((*value == '-') || ((*value >= '0') && (*value <= '9')))
{
return parse_number(item, value);
}
if (*value == '[')
{
return parse_array(item, value, ep);
}
if (*value == '{')
{
return parse_object(item, value, ep);
}
*ep=value;return 0; /* failure. */
}
/* Render a value to text. */
static char *print_value(const cJSON *item, int depth, int fmt, printbuffer *p)
{
char *out = 0;
if (!item)
{
return 0;
}
if (p)
{
switch ((item->type) & 0xFF)
{
case cJSON_NULL:
out = ensure(p, 5);
if (out)
{
strcpy(out, "null");
}
break;
case cJSON_False:
out = ensure(p, 6);
if (out)
{
strcpy(out, "false");
}
break;
case cJSON_True:
out = ensure(p, 5);
if (out)
{
strcpy(out, "true");
}
break;
case cJSON_Number:
out = print_number(item, p);
break;
case cJSON_String:
out = print_string(item, p);
break;
case cJSON_Array:
out = print_array(item, depth, fmt, p);
break;
case cJSON_Object:
out = print_object(item, depth, fmt, p);
break;
}
}
else
{
switch ((item->type) & 0xFF)
{
case cJSON_NULL:
out = cJSON_strdup("null");
break;
case cJSON_False:
out = cJSON_strdup("false");
break;
case cJSON_True:
out = cJSON_strdup("true");
break;
case cJSON_Number:
out = print_number(item, 0);
break;
case cJSON_String:
out = print_string(item, 0);
break;
case cJSON_Array:
out = print_array(item, depth, fmt, 0);
break;
case cJSON_Object:
out = print_object(item, depth, fmt, 0);
break;
}
}
return out;
}
/* Build an array from input text. */
static const char *parse_array(cJSON *item,const char *value,const char **ep)
{
cJSON *child;
if (*value != '[')
{
/* not an array! */
*ep = value;
return 0;
}
item->type = cJSON_Array;
value = skip(value + 1);
if (*value == ']')
{
/* empty array. */
return value + 1;
}
item->child = child = cJSON_New_Item();
if (!item->child)