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/* 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
#ifdef __cplusplus
const struct _json_value json_value_none; /* zero-d by ctor */
#else
const struct _json_value json_value_none = { 0 };
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
typedef unsigned short json_uchar;
static unsigned char hex_value(json_char c)
{
if (isdigit((uint8_t)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;
} 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.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:
values_size = sizeof(*value->u.object.values) *
value->u.object.length;
if (!((*(void **)&value->u.object.values) = json_alloc
(state,
values_size +
((size_t)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;
}
value = (json_value *)json_alloc(state, sizeof(json_value), 1);
if (!value) {
return 0;
}
if (!*root) {
*root = value;
}
value->type = type;
value->parent = *top;
if (*alloc) {
(*alloc)->_reserved.next_alloc = value;
}
*alloc = *top = value;
return 1;
}
#define e_off \
((int)(i - cur_line_begin))
#define whitespace \
case '\n': \
++cur_line; cur_line_begin = i; \
case ' ': \
case '\t': \
case '\r'
#define string_add(b) \
do { if (!state.first_pass) { string[string_length] = b; \
} ++string_length; } while (0)
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];
unsigned int cur_line;
const json_char *cur_line_begin, *i, *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;
cur_line = 1;
cur_line_begin = json;
for (i = json;; ++i) {
json_char b = (i == end ? 0 : *i);
if (flags & flag_string) {
if (!b) {
sprintf(error, "Unexpected EOF in string (at %d:%d)",
cur_line, e_off);
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 - i < 4 ||
(uc_b1 = hex_value(*++i)) == 0xFF ||
(uc_b2 = hex_value(*++i)) == 0xFF
|| (uc_b3 = hex_value(*++i)) == 0xFF ||
(uc_b4 = hex_value(*++i)) == 0xFF) {
sprintf(error,
"Invalid character value `%c` (at %d:%d)",
b, cur_line, e_off);
goto e_failed;
}
uc_b1 = uc_b1 * 16 + uc_b2;
uc_b2 = uc_b3 * 16 + uc_b4;
uchar = ((json_char)uc_b1) * 256 + uc_b2;
if (sizeof(json_char) >= sizeof(json_uchar) ||
(uc_b1 == 0 && uc_b2 <= 0x7F)) {
string_add((json_char)uchar);
break;
}
if (uchar <= 0x7FF) {
if (state.first_pass) {
string_length += 2;
} else {
string[string_length++] = 0xC0 |
((uc_b2 &
0xC0) >>
6) |
((uc_b1 & 0x7) << 2);
string[string_length++] = 0x80 |
(uc_b2 & 0x3F);
}
break;
}
if (state.first_pass) {
string_length += 3;
} else {
string[string_length++] = 0xE0 |
((uc_b1 & 0xF0) >> 4);
string[string_length++] = 0x80 |
((uc_b1 &
0xF) <<
2) |
((uc_b2 & 0xC0) >> 6);
string[string_length++] = 0x80 | (uc_b2 & 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;
--i; /* so null can be reproc'd */
}
continue;
}
if (flags & flag_block_comment) {
if (!b) {
sprintf(error,
"%d:%d: Unexpected EOF in block comment",
cur_line, e_off);
goto e_failed;
}
if (b == '*' && i < (end - 1) && i[1] == '/') {
flags &= ~flag_block_comment;
++i; /* 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",
cur_line, e_off);
goto e_failed;
}
if (++i == end) {
sprintf(error, "%d:%d: EOF unexpected", cur_line,
e_off);
goto e_failed;
}
switch (b = *i) {
case '/':
flags |= flag_line_comment;
continue;
case '*':
flags |= flag_block_comment;
continue;
default:
sprintf(error,
"%d:%d: Unexpected `%c` in comment opening sequence", cur_line, e_off,
b);
goto e_failed;
}
}
}
if (flags & flag_done) {
if (!b) {
break;
}
switch (b) {
whitespace:
continue;
default:
sprintf(error, "%d:%d: Trailing garbage: `%c`", cur_line,
e_off, b);
goto e_failed;
}
}
if (flags & flag_seek_value) {
switch (b) {
whitespace:
continue;
case ']':
if (top->type == json_array) {
flags =
(flags &
~(flag_need_comma | flag_seek_value)) | flag_next;
} else {
sprintf(error, "%d:%d: Unexpected ]", cur_line, e_off);
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",
cur_line, e_off, b);
goto e_failed;
}
}
if (flags & flag_need_colon) {
if (b == ':') {
flags &= ~flag_need_colon;
continue;
} else {
sprintf(error, "%d:%d: Expected : before %c",
cur_line, e_off, 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 - i) < 3 || *(++i) != 'r' || *(++i) != 'u' ||
*(++i) != '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 - i) < 4 || *(++i) != 'a' || *(++i) != 'l' ||
*(++i) != 's' || *(++i) != '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 - i) < 3 || *(++i) != 'u' || *(++i) != 'l' ||
*(++i) != '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((uint8_t)b) || b == '-') {
if (!new_value(&state, &top, &root, &alloc,
json_integer)) {
goto e_alloc_failure;
}
if (!state.first_pass) {
while (isdigit((uint8_t)b) || b == '+' || b ==
'-'
|| b == 'e' || b == 'E' || b == '.') {
if ((++i) == end) {
b = 0;
break;
}
b = *i;
}
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",
cur_line, e_off, 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 \"",
cur_line, e_off);
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",
cur_line, e_off, b);
goto e_failed;
}
break;
case json_integer:
case json_double:
if (isdigit((uint8_t)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`",
cur_line, e_off, 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 `.`",
cur_line, e_off);
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 `.`",
cur_line, e_off);
goto e_failed;
}
top->u.dbl += ((double)num_fraction) /
(pow(10, (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`",
cur_line, e_off);
goto e_failed;
}
top->u.dbl *=
pow(10,
(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;
--i;
}
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", cur_line, e_off);
goto e_failed;
e_alloc_failure:
strcpy(error, "Memory allocation failure");
goto e_failed;
e_overflow:
sprintf(error, "%d:%d: Too long (caught overflow)", cur_line, e_off);
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);
}