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cJSON.c
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/*
* Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
*
* 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. */
/* disable warnings about old C89 functions in MSVC */
#if !defined(_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER)
#define _CRT_SECURE_NO_DEPRECATE
#endif
#ifdef __GNUC__
#pragma GCC visibility push(default)
#endif
#if defined(_MSC_VER)
#pragma warning (push)
/* disable warning about single line comments in system headers */
#pragma warning (disable : 4001)
#endif
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <float.h>
#include <limits.h>
#include <ctype.h>
#ifdef ENABLE_LOCALES
#include <locale.h>
#endif
#if defined(_MSC_VER)
#pragma warning (pop)
#endif
#ifdef __GNUC__
#pragma GCC visibility pop
#endif
#include "cJSON.h"
/* define our own boolean type */
#define true ((cJSON_bool)1)
#define false ((cJSON_bool)0)
typedef struct {
const unsigned char * json;
size_t position;
} error;
static error global_error = { NULL, 0 };
CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void){
return (const char *)(global_error.json + global_error.position);
}
CJSON_PUBLIC(char *) cJSON_GetStringValue(cJSON * item) {
if (!cJSON_IsString(item))
return NULL;
return item->valuestring;
}
/* This is a safeguard to prevent copy-pasters from using incompatible C and header files */
#if (CJSON_VERSION_MAJOR != 1) || (CJSON_VERSION_MINOR != 7) || (CJSON_VERSION_PATCH != 0)
#error cJSON.h and cJSON.c have different versions. Make sure that both have the same.
#endif
CJSON_PUBLIC(const char *) cJSON_Version(void){
static char version[15];
sprintf(version, "%i.%i.%i", CJSON_VERSION_MAJOR, CJSON_VERSION_MINOR, CJSON_VERSION_PATCH);
return version;
}
/* Case insensitive string comparison, doesn't consider two NULL pointers equal though */
static int case_insensitive_strcmp(const unsigned char *string1, const unsigned char *string2)
{
if ((string1 == NULL) || (string2 == NULL))
return 1;
if (string1 == string2)
return 0;
for (; tolower(*string1) == tolower(*string2); (void)string1++, string2++) {
if (*string1 == '\0')
return 0;
}
return tolower(*string1) - tolower(*string2);
}
typedef struct internal_hooks {
void *(*allocate)(size_t size);
void (*deallocate)(void *pointer);
void *(*reallocate)(void *pointer, size_t size);
} internal_hooks;
#if defined(_MSC_VER)
/* work around MSVC error C2322: '...' address of dillimport '...' is not static */
static void *internal_malloc(size_t size)
{
return malloc(size);
}
static void internal_free(void *pointer)
{
free(pointer);
}
static void *internal_realloc(void *pointer, size_t size)
{
return realloc(pointer, size);
}
#else
#define internal_malloc malloc
#define internal_free free
#define internal_realloc realloc
#endif
static internal_hooks global_hooks = { internal_malloc, internal_free, internal_realloc };
static unsigned char *cJSON_strdup(const unsigned char *string, const internal_hooks *const hooks)
{
size_t length = 0;
unsigned char *copy = NULL;
if (string == NULL)
return NULL;
length = strlen((const char *)string) + sizeof("");
copy = (unsigned char *)hooks->allocate(length);
if (copy == NULL)
return NULL;
memcpy(copy, string, length);
return copy;
}
CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks * hooks){
if (hooks == NULL) {
/* Reset hooks */
global_hooks.allocate = malloc;
global_hooks.deallocate = free;
global_hooks.reallocate = realloc;
return;
}
global_hooks.allocate = malloc;
if (hooks->malloc_fn != NULL)
global_hooks.allocate = hooks->malloc_fn;
global_hooks.deallocate = free;
if (hooks->free_fn != NULL)
global_hooks.deallocate = hooks->free_fn;
/* use realloc only if both free and malloc are used */
global_hooks.reallocate = NULL;
if ((global_hooks.allocate == malloc) && (global_hooks.deallocate == free))
global_hooks.reallocate = realloc;
}
/* Internal constructor. */
static cJSON *cJSON_New_Item(const internal_hooks *const hooks)
{
cJSON *node = (cJSON *)hooks->allocate(sizeof(cJSON));
if (node)
memset(node, '\0', sizeof(cJSON));
return node;
}
/* Delete a cJSON structure. */
CJSON_PUBLIC(void) cJSON_Delete(cJSON * item){
cJSON *next = NULL;
while (item != NULL) {
next = item->next;
if (!(item->type & cJSON_IsReference) && (item->child != NULL))
cJSON_Delete(item->child);
if (!(item->type & cJSON_IsReference) && (item->valuestring != NULL))
global_hooks.deallocate(item->valuestring);
if (!(item->type & cJSON_StringIsConst) && (item->string != NULL))
global_hooks.deallocate(item->string);
global_hooks.deallocate(item);
item = next;
}
}
/* get the decimal point character of the current locale */
static unsigned char get_decimal_point(void)
{
#ifdef ENABLE_LOCALES
struct lconv *lconv = localeconv();
return (unsigned char)lconv->decimal_point[0];
#else
return '.';
#endif
}
typedef struct {
const unsigned char * content;
size_t length;
size_t offset;
size_t depth; /* How deeply nested (in arrays/objects) is the input at the current offset. */
internal_hooks hooks;
} parse_buffer;
/* check if the given size is left to read in a given parse buffer (starting with 1) */
#define can_read(buffer, size) ((buffer != NULL) && (((buffer)->offset + size) <= (buffer)->length))
/* check if the buffer can be accessed at the given index (starting with 0) */
#define can_access_at_index(buffer, index) ((buffer != NULL) && (((buffer)->offset + index) < (buffer)->length))
#define cannot_access_at_index(buffer, index) (!can_access_at_index(buffer, index))
/* get a pointer to the buffer at the position */
#define buffer_at_offset(buffer) ((buffer)->content + (buffer)->offset)
/* Parse the input text to generate a number, and populate the result into item. */
static cJSON_bool parse_number(cJSON *const item, parse_buffer *const input_buffer)
{
double number = 0;
unsigned char *after_end = NULL;
unsigned char number_c_string[64];
unsigned char decimal_point = get_decimal_point();
size_t i = 0;
if ((input_buffer == NULL) || (input_buffer->content == NULL))
return false;
/* copy the number into a temporary buffer and replace '.' with the decimal point
* of the current locale (for strtod)
* This also takes care of '\0' not necessarily being available for marking the end of the input */
for (i = 0; (i < (sizeof(number_c_string) - 1)) && can_access_at_index(input_buffer, i); i++) {
switch (buffer_at_offset(input_buffer)[i]) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '+':
case '-':
case 'e':
case 'E':
number_c_string[i] = buffer_at_offset(input_buffer)[i];
break;
case '.':
number_c_string[i] = decimal_point;
break;
default:
goto loop_end;
}
}
loop_end:
number_c_string[i] = '\0';
number = strtod((const char *)number_c_string, (char **)&after_end);
if (number_c_string == after_end)
return false; /* parse_error */
item->valuedouble = number;
/* use saturation in case of overflow */
if (number >= INT_MAX)
item->valueint = INT_MAX;
else if (number <= INT_MIN)
item->valueint = INT_MIN;
else
item->valueint = (int)number;
item->type = cJSON_Number;
input_buffer->offset += (size_t)(after_end - number_c_string);
return true;
}
/* don't ask me, but the original cJSON_SetNumberValue returns an integer or double */
CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON * object, double number){
if (number >= INT_MAX)
object->valueint = INT_MAX;
else if (number <= INT_MIN)
object->valueint = INT_MIN;
else
object->valueint = (int)number;
return object->valuedouble = number;
}
typedef struct {
unsigned char * buffer;
size_t length;
size_t offset;
size_t depth; /* current nesting depth (for formatted printing) */
cJSON_bool noalloc;
cJSON_bool format; /* is this print a formatted print */
internal_hooks hooks;
} printbuffer;
/* realloc printbuffer if necessary to have at least "needed" bytes more */
static unsigned char *ensure(printbuffer *const p, size_t needed)
{
unsigned char *newbuffer = NULL;
size_t newsize = 0;
if ((p == NULL) || (p->buffer == NULL))
return NULL;
if ((p->length > 0) && (p->offset >= p->length))
/* make sure that offset is valid */
return NULL;
if (needed > INT_MAX)
/* sizes bigger than INT_MAX are currently not supported */
return NULL;
needed += p->offset + 1;
if (needed <= p->length)
return p->buffer + p->offset;
if (p->noalloc)
return NULL;
/* calculate new buffer size */
if (needed > (INT_MAX / 2)) {
/* overflow of int, use INT_MAX if possible */
if (needed <= INT_MAX)
newsize = INT_MAX;
else
return NULL;
} else {
newsize = needed * 2;
}
if (p->hooks.reallocate != NULL) {
/* reallocate with realloc if available */
newbuffer = (unsigned char *)p->hooks.reallocate(p->buffer, newsize);
if (newbuffer == NULL) {
p->hooks.deallocate(p->buffer);
p->length = 0;
p->buffer = NULL;
return NULL;
}
} else {
/* otherwise reallocate manually */
newbuffer = (unsigned char *)p->hooks.allocate(newsize);
if (!newbuffer) {
p->hooks.deallocate(p->buffer);
p->length = 0;
p->buffer = NULL;
return NULL;
}
if (newbuffer)
memcpy(newbuffer, p->buffer, p->offset + 1);
p->hooks.deallocate(p->buffer);
}
p->length = newsize;
p->buffer = newbuffer;
return newbuffer + p->offset;
}
/* calculate the new length of the string in a printbuffer and update the offset */
static void update_offset(printbuffer *const buffer)
{
const unsigned char *buffer_pointer = NULL;
if ((buffer == NULL) || (buffer->buffer == NULL))
return;
buffer_pointer = buffer->buffer + buffer->offset;
buffer->offset += strlen((const char *)buffer_pointer);
}
/* Render the number nicely from the given item into a string. */
static cJSON_bool print_number(const cJSON *const item, printbuffer *const output_buffer)
{
unsigned char *output_pointer = NULL;
double d = item->valuedouble;
int length = 0;
size_t i = 0;
unsigned char number_buffer[26]; /* temporary buffer to print the number into */
unsigned char decimal_point = get_decimal_point();
double test;
if (output_buffer == NULL)
return false;
/* This checks for NaN and Infinity */
if ((d * 0) != 0) {
length = sprintf((char *)number_buffer, "null");
} else {
/* Try 15 decimal places of precision to avoid nonsignificant nonzero digits */
length = sprintf((char *)number_buffer, "%1.15g", d);
/* Check whether the original double can be recovered */
if ((sscanf((char *)number_buffer, "%lg", &test) != 1) || ((double)test != d))
/* If not, print with 17 decimal places of precision */
length = sprintf((char *)number_buffer, "%1.17g", d);
}
/* sprintf failed or buffer overrun occured */
if ((length < 0) || (length > (int)(sizeof(number_buffer) - 1)))
return false;
/* reserve appropriate space in the output */
output_pointer = ensure(output_buffer, (size_t)length);
if (output_pointer == NULL)
return false;
/* copy the printed number to the output and replace locale
* dependent decimal point with '.' */
for (i = 0; i < ((size_t)length); i++) {
if (number_buffer[i] == decimal_point) {
output_pointer[i] = '.';
continue;
}
output_pointer[i] = number_buffer[i];
}
output_pointer[i] = '\0';
output_buffer->offset += (size_t)length;
return true;
}
/* parse 4 digit hexadecimal number */
static unsigned parse_hex4(const unsigned char *const input)
{
unsigned int h = 0;
size_t i = 0;
for (i = 0; i < 4; i++) {
/* parse digit */
if ((input[i] >= '0') && (input[i] <= '9'))
h += (unsigned int)input[i] - '0';
else if ((input[i] >= 'A') && (input[i] <= 'F'))
h += (unsigned int)10 + input[i] - 'A';
else if ((input[i] >= 'a') && (input[i] <= 'f'))
h += (unsigned int)10 + input[i] - 'a';
else /* invalid */
return 0;
if (i < 3)
/* shift left to make place for the next nibble */
h = h << 4;
}
return h;
}
/* converts a UTF-16 literal to UTF-8
* A literal can be one or two sequences of the form \uXXXX */
static unsigned char utf16_literal_to_utf8(const unsigned char *const input_pointer, const unsigned char *const input_end, unsigned char **output_pointer)
{
long unsigned int codepoint = 0;
unsigned int first_code = 0;
const unsigned char *first_sequence = input_pointer;
unsigned char utf8_length = 0;
unsigned char utf8_position = 0;
unsigned char sequence_length = 0;
unsigned char first_byte_mark = 0;
if ((input_end - first_sequence) < 6)
/* input ends unexpectedly */
goto fail;
/* get the first utf16 sequence */
first_code = parse_hex4(first_sequence + 2);
/* check that the code is valid */
if (((first_code >= 0xDC00) && (first_code <= 0xDFFF)))
goto fail;
/* UTF16 surrogate pair */
if ((first_code >= 0xD800) && (first_code <= 0xDBFF)) {
const unsigned char *second_sequence = first_sequence + 6;
unsigned int second_code = 0;
sequence_length = 12; /* \uXXXX\uXXXX */
if ((input_end - second_sequence) < 6)
/* input ends unexpectedly */
goto fail;
if ((second_sequence[0] != '\\') || (second_sequence[1] != 'u'))
/* missing second half of the surrogate pair */
goto fail;
/* get the second utf16 sequence */
second_code = parse_hex4(second_sequence + 2);
/* check that the code is valid */
if ((second_code < 0xDC00) || (second_code > 0xDFFF))
/* invalid second half of the surrogate pair */
goto fail;
/* calculate the unicode codepoint from the surrogate pair */
codepoint = 0x10000 + (((first_code & 0x3FF) << 10) | (second_code & 0x3FF));
} else {
sequence_length = 6; /* \uXXXX */
codepoint = first_code;
}
/* encode as UTF-8
* takes at maximum 4 bytes to encode:
* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
if (codepoint < 0x80) {
/* normal ascii, encoding 0xxxxxxx */
utf8_length = 1;
} else if (codepoint < 0x800) {
/* two bytes, encoding 110xxxxx 10xxxxxx */
utf8_length = 2;
first_byte_mark = 0xC0; /* 11000000 */
} else if (codepoint < 0x10000) {
/* three bytes, encoding 1110xxxx 10xxxxxx 10xxxxxx */
utf8_length = 3;
first_byte_mark = 0xE0; /* 11100000 */
} else if (codepoint <= 0x10FFFF) {
/* four bytes, encoding 1110xxxx 10xxxxxx 10xxxxxx 10xxxxxx */
utf8_length = 4;
first_byte_mark = 0xF0; /* 11110000 */
} else {
/* invalid unicode codepoint */
goto fail;
}
/* encode as utf8 */
for (utf8_position = (unsigned char)(utf8_length - 1); utf8_position > 0; utf8_position--) {
/* 10xxxxxx */
(*output_pointer)[utf8_position] = (unsigned char)((codepoint | 0x80) & 0xBF);
codepoint >>= 6;
}
/* encode first byte */
if (utf8_length > 1)
(*output_pointer)[0] = (unsigned char)((codepoint | first_byte_mark) & 0xFF);
else
(*output_pointer)[0] = (unsigned char)(codepoint & 0x7F);
*output_pointer += utf8_length;
return sequence_length;
fail:
return 0;
}
/* Parse the input text into an unescaped cinput, and populate item. */
static cJSON_bool parse_string(cJSON *const item, parse_buffer *const input_buffer)
{
const unsigned char *input_pointer = buffer_at_offset(input_buffer) + 1;
const unsigned char *input_end = buffer_at_offset(input_buffer) + 1;
unsigned char *output_pointer = NULL;
unsigned char *output = NULL;
/* not a string */
if (buffer_at_offset(input_buffer)[0] != '\"')
goto fail;
{
/* calculate approximate size of the output (overestimate) */
size_t allocation_length = 0;
size_t skipped_bytes = 0;
while (((size_t)(input_end - input_buffer->content) < input_buffer->length) && (*input_end != '\"')) {
/* is escape sequence */
if (input_end[0] == '\\') {
if ((size_t)(input_end + 1 - input_buffer->content) >= input_buffer->length)
/* prevent buffer overflow when last input character is a backslash */
goto fail;
skipped_bytes++;
input_end++;
}
input_end++;
}
if (((size_t)(input_end - input_buffer->content) >= input_buffer->length) || (*input_end != '\"'))
goto fail; /* string ended unexpectedly */
/* This is at most how much we need for the output */
allocation_length = (size_t)(input_end - buffer_at_offset(input_buffer)) - skipped_bytes;
output = (unsigned char *)input_buffer->hooks.allocate(allocation_length + sizeof(""));
if (output == NULL)
goto fail; /* allocation failure */
}
output_pointer = output;
/* loop through the string literal */
while (input_pointer < input_end) {
if (*input_pointer != '\\') {
*output_pointer++ = *input_pointer++;
}
/* escape sequence */
else {
unsigned char sequence_length = 2;
if ((input_end - input_pointer) < 1)
goto fail;
switch (input_pointer[1]) {
case 'b':
*output_pointer++ = '\b';
break;
case 'f':
*output_pointer++ = '\f';
break;
case 'n':
*output_pointer++ = '\n';
break;
case 'r':
*output_pointer++ = '\r';
break;
case 't':
*output_pointer++ = '\t';
break;
case '\"':
case '\\':
case '/':
*output_pointer++ = input_pointer[1];
break;
/* UTF-16 literal */
case 'u':
sequence_length = utf16_literal_to_utf8(input_pointer, input_end, &output_pointer);
if (sequence_length == 0)
/* failed to convert UTF16-literal to UTF-8 */
goto fail;
break;
default:
goto fail;
}
input_pointer += sequence_length;
}
}
/* zero terminate the output */
*output_pointer = '\0';
item->type = cJSON_String;
item->valuestring = (char *)output;
input_buffer->offset = (size_t)(input_end - input_buffer->content);
input_buffer->offset++;
return true;
fail:
if (output != NULL)
input_buffer->hooks.deallocate(output);
if (input_pointer != NULL)
input_buffer->offset = (size_t)(input_pointer - input_buffer->content);
return false;
}
/* Render the cstring provided to an escaped version that can be printed. */
static cJSON_bool print_string_ptr(const unsigned char *const input, printbuffer *const output_buffer)
{
const unsigned char *input_pointer = NULL;
unsigned char *output = NULL;
unsigned char *output_pointer = NULL;
size_t output_length = 0;
/* numbers of additional characters needed for escaping */
size_t escape_characters = 0;
if (output_buffer == NULL)
return false;
/* empty string */
if (input == NULL) {
output = ensure(output_buffer, sizeof("\"\""));
if (output == NULL)
return false;
strcpy((char *)output, "\"\"");
return true;
}
/* set "flag" to 1 if something needs to be escaped */
for (input_pointer = input; *input_pointer; input_pointer++) {
switch (*input_pointer) {
case '\"':
case '\\':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
/* one character escape sequence */
escape_characters++;
break;
default:
if (*input_pointer < 32)
/* UTF-16 escape sequence uXXXX */
escape_characters += 5;
break;
}
}
output_length = (size_t)(input_pointer - input) + escape_characters;
output = ensure(output_buffer, output_length + sizeof("\"\""));
if (output == NULL)
return false;
/* no characters have to be escaped */
if (escape_characters == 0) {
output[0] = '\"';
memcpy(output + 1, input, output_length);
output[output_length + 1] = '\"';
output[output_length + 2] = '\0';
return true;
}
output[0] = '\"';
output_pointer = output + 1;
/* copy the string */
for (input_pointer = input; *input_pointer != '\0'; (void)input_pointer++, output_pointer++) {
if ((*input_pointer > 31) && (*input_pointer != '\"') && (*input_pointer != '\\')) {
/* normal character, copy */
*output_pointer = *input_pointer;
} else {
/* character needs to be escaped */
*output_pointer++ = '\\';
switch (*input_pointer) {
case '\\':
*output_pointer = '\\';
break;
case '\"':
*output_pointer = '\"';
break;
case '\b':
*output_pointer = 'b';
break;
case '\f':
*output_pointer = 'f';
break;
case '\n':
*output_pointer = 'n';
break;
case '\r':
*output_pointer = 'r';
break;
case '\t':
*output_pointer = 't';
break;
default:
/* escape and print as unicode codepoint */
sprintf((char *)output_pointer, "u%04x", *input_pointer);
output_pointer += 4;
break;
}
}
}
output[output_length + 1] = '\"';
output[output_length + 2] = '\0';
return true;
}
/* Invoke print_string_ptr (which is useful) on an item. */
static cJSON_bool print_string(const cJSON *const item, printbuffer *const p)
{
return print_string_ptr((unsigned char *)item->valuestring, p);
}
/* Predeclare these prototypes. */
static cJSON_bool parse_value(cJSON *const item, parse_buffer *const input_buffer);
static cJSON_bool print_value(const cJSON *const item, printbuffer *const output_buffer);
static cJSON_bool parse_array(cJSON *const item, parse_buffer *const input_buffer);
static cJSON_bool print_array(const cJSON *const item, printbuffer *const output_buffer);
static cJSON_bool parse_object(cJSON *const item, parse_buffer *const input_buffer);
static cJSON_bool print_object(const cJSON *const item, printbuffer *const output_buffer);
/* Utility to jump whitespace and cr/lf */
static parse_buffer *buffer_skip_whitespace(parse_buffer *const buffer)
{
if ((buffer == NULL) || (buffer->content == NULL))
return NULL;
while (can_access_at_index(buffer, 0) && (buffer_at_offset(buffer)[0] <= 32))
buffer->offset++;
if (buffer->offset == buffer->length)
buffer->offset--;
return buffer;
}
/* skip the UTF-8 BOM (byte order mark) if it is at the beginning of a buffer */
static parse_buffer *skip_utf8_bom(parse_buffer *const buffer)
{
if ((buffer == NULL) || (buffer->content == NULL) || (buffer->offset != 0))
return NULL;
if (can_access_at_index(buffer, 4) && (strncmp((const char *)buffer_at_offset(buffer), "\xEF\xBB\xBF", 3) == 0))
buffer->offset += 3;
return buffer;
}
/* Parse an object - create a new root, and populate. */
CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated){
parse_buffer buffer = { 0, 0, 0, 0, { 0, 0, 0 } };
cJSON *item = NULL;
/* reset error position */
global_error.json = NULL;
global_error.position = 0;
if (value == NULL)
goto fail;
buffer.content = (const unsigned char *)value;
buffer.length = strlen((const char *)value) + sizeof("");
buffer.offset = 0;
buffer.hooks = global_hooks;
item = cJSON_New_Item(&global_hooks);
if (item == NULL) /* memory fail */
goto fail;
if (!parse_value(item, buffer_skip_whitespace(skip_utf8_bom(&buffer))))
/* parse failure. ep is set. */
goto fail;
/* if we require null-terminated JSON without appended garbage, skip and then check for a null terminator */
if (require_null_terminated) {
buffer_skip_whitespace(&buffer);
if ((buffer.offset >= buffer.length) || buffer_at_offset(&buffer)[0] != '\0')
goto fail;
}
if (return_parse_end)
*return_parse_end = (const char *)buffer_at_offset(&buffer);
return item;
fail:
if (item != NULL)
cJSON_Delete(item);
if (value != NULL) {
error local_error;
local_error.json = (const unsigned char *)value;
local_error.position = 0;
if (buffer.offset < buffer.length)
local_error.position = buffer.offset;
else if (buffer.length > 0)
local_error.position = buffer.length - 1;
if (return_parse_end != NULL)
*return_parse_end = (const char *)local_error.json + local_error.position;
global_error = local_error;
}
return NULL;
}
/* Default options for cJSON_Parse */
CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value){
return cJSON_ParseWithOpts(value, 0, 0);
}
#define cjson_min(a, b) ((a < b) ? a : b)
static unsigned char *print(const cJSON *const item, cJSON_bool format, const internal_hooks *const hooks)
{
printbuffer buffer[1];
unsigned char *printed = NULL;
memset(buffer, 0, sizeof(buffer));
/* create buffer */
buffer->buffer = (unsigned char *)hooks->allocate(256);
buffer->format = format;
buffer->hooks = *hooks;
if (buffer->buffer == NULL)
goto fail;
/* print the value */
if (!print_value(item, buffer))
goto fail;
update_offset(buffer);
/* check if reallocate is available */
if (hooks->reallocate != NULL) {
printed = (unsigned char *)hooks->reallocate(buffer->buffer, buffer->length);
buffer->buffer = NULL;
if (printed == NULL)
goto fail;
} else { /* otherwise copy the JSON over to a new buffer */
printed = (unsigned char *)hooks->allocate(buffer->offset + 1);
if (printed == NULL)
goto fail;
memcpy(printed, buffer->buffer, cjson_min(buffer->length, buffer->offset + 1));
printed[buffer->offset] = '\0'; /* just to be sure */
/* free the buffer */
hooks->deallocate(buffer->buffer);
}
return printed;
fail:
if (buffer->buffer != NULL)
hooks->deallocate(buffer->buffer);
if (printed != NULL)
hooks->deallocate(printed);
return NULL;
}
/* Render a cJSON item/entity/structure to text. */
CJSON_PUBLIC(char *) cJSON_Print(const cJSON * item){
return (char *)print(item, true, &global_hooks);
}
CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON * item){
return (char *)print(item, false, &global_hooks);
}
CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON * item, int prebuffer, cJSON_bool fmt){
printbuffer p = { 0, 0, 0, 0, 0, 0, { 0, 0, 0 } };
if (prebuffer < 0)
return NULL;
p.buffer = (unsigned char *)global_hooks.allocate((size_t)prebuffer);
if (!p.buffer)
return NULL;
p.length = (size_t)prebuffer;
p.offset = 0;
p.noalloc = false;
p.format = fmt;
p.hooks = global_hooks;
if (!print_value(item, &p)) {
global_hooks.deallocate(p.buffer);
return NULL;
}
return (char *)p.buffer;
}
CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON * item, char *buf, const int len, const cJSON_bool fmt){
printbuffer p = { 0, 0, 0, 0, 0, 0, { 0, 0, 0 } };
if ((len < 0) || (buf == NULL))
return false;
p.buffer = (unsigned char *)buf;
p.length = (size_t)len;
p.offset = 0;
p.noalloc = true;
p.format = fmt;
p.hooks = global_hooks;
return print_value(item, &p);
}
/* Parser core - when encountering text, process appropriately. */
static cJSON_bool parse_value(cJSON *const item, parse_buffer *const input_buffer)
{
if ((input_buffer == NULL) || (input_buffer->content == NULL))
return false; /* no input */
/* parse the different types of values */
/* null */
if (can_read(input_buffer, 4) && (strncmp((const char *)buffer_at_offset(input_buffer), "null", 4) == 0)) {
item->type = cJSON_NULL;
input_buffer->offset += 4;
return true;
}