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jfes.c
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jfes.c
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/**
\file jfes.c
\author Eremin Dmitry (http://github.com/NeonMercury)
\date October, 2015
\brief Json For Embedded Systems library source code.
*/
#include "jfes.h"
/** Needed for the buffer in jfes_(int/double)_to_string(_r). */
#define JFES_MAX_DIGITS 64
/** Needed for the default precision in jfes_double_to_string(_r). */
#define JFES_DOUBLE_PRECISION 0.000000001
/** Needed for the boolean-related functions */
#define JFES_TRUE_VALUE "true"
#define JFES_FALSE_VALUE "false"
/** Needed for the jfes_is_null function */
#define JFES_NULL_VALUE "null"
/** Integer types */
typedef enum jfes_integer_type {
jfes_not_integer = 0x00, /**< String can't be interpreted as integer. */
jfes_octal_integer = 0x08, /**< Octal integer (starts from zero: `023` = `19`) */
jfes_decimal_integer = 0x0A, /**< Decimal integer */
jfes_hexadecimal_integer = 0x10, /**< Hexadecimal integer (mask: `0x...` or `0X...`) */
} jfes_integer_type_t;
/** Stream helper. */
typedef struct jfes_stringstream {
char *data; /**< String data. */
jfes_size_t max_size; /**< Maximal data size. */
jfes_size_t current_index; /**< Current index to the end of the data. */
} jfes_stringstream_t;
/**
Memory comparing function.
\param[in] p1 Pointer to the first buffer.
\param[in] p2 Pointer to the second buffer.
\param[in] count Number of bytes to compare.
\return Zero if all bytes are equal.
*/
static int jfes_memcmp(const void *p1, const void *p2, jfes_size_t count) {
int delta = 0;
unsigned char *ptr1 = (unsigned char *)p1;
unsigned char *ptr2 = (unsigned char *)p2;
while (count-- > 0 && delta == 0) {
delta = *(ptr1++) - *(ptr2++);
}
return delta;
}
/**
Copies memory. Doesn't support overlapping.
\param[out] dst Output memory block.
\param[in] src Input memory block.
\param[in] count Bytes count to copy.
\return Pointer to the destination memory.
*/
static void *jfes_memcpy(void *dst, const void *src, jfes_size_t count) {
unsigned char *destination = (unsigned char *)dst;
unsigned char *source = (unsigned char *)src;
while (count-- > 0) {
*(destination++) = *(source++);
}
return dst;
}
/**
Checks configuration object and its members.
\param[in] config Object to be checked.
\return Zero if something wrong. Anything otherwise.
*/
static int jfes_check_configuration(const jfes_config_t *config) {
return config && config->jfes_malloc && config->jfes_free;
}
/**
Allocates jfes_string.
\param[in] config JFES configuration.
\param[out] str String to be allocated.
\param[in] size Size to allocate.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_allocate_string(const jfes_config_t *config, jfes_string_t *str, jfes_size_t size) {
if (!jfes_check_configuration(config) || !str || size == 0) {
return jfes_invalid_arguments;
}
jfes_status_t status = jfes_success;
str->data = (char*)config->jfes_malloc(size);
if (!str->data) {
status = jfes_no_memory;
size = 0;
}
str->size = size;
return status;
}
/**
Deallocates jfes_string.
\param[in] config JFES configuration.
\param[out] str String to be deallocated.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_free_string(const jfes_config_t *config, jfes_string_t *str) {
if (!jfes_check_configuration(config) || !str) {
return jfes_invalid_arguments;
}
if (str->size > 0) {
str->size = 0;
config->jfes_free(str->data);
str->data = JFES_NULL;
}
return jfes_success;
}
/**
Creates string object.
\param[in] config JFES configuration.
\param[out] str String to be created.
\param[in] string Initial string value.
\param[in] size Initial string length.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_create_string(const jfes_config_t *config, jfes_string_t *str, const char *string, jfes_size_t size) {
if (!jfes_check_configuration(config) || !str || !string || size == 0) {
return jfes_invalid_arguments;
}
const jfes_status_t status = jfes_allocate_string(config, str, size + 1);
if (jfes_status_is_good(status)) {
jfes_memcpy(str->data, string, size);
str->data[size] = '\0';
}
return status;
}
/**
Finds length of the null-terminated string.
\param[in] data Null-terminated string.
\return Length if the string is null-terminated.
*/
static jfes_size_t jfes_strlen(const char *data) {
if (!data) {
return 0;
}
const char *p = data;
while (*p++);
return (jfes_size_t)(p - data) - 1;
}
/**
Analyzes input string on the subject of whether it's equal to "null".
\param[in] data Input string.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Zero if input string is not equal to "null". Otherwise anything.
*/
static int jfes_is_null(const char *data, jfes_size_t length) {
if (!data) {
return 0;
}
if (length == 0) {
length = jfes_strlen(data);
}
return length == jfes_strlen(JFES_NULL_VALUE) && jfes_memcmp(data, JFES_NULL_VALUE, length) == 0;
}
/**
Analyzes input string on the subject of whether it is boolean.
\param[in] data Input string.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Zero if input string is not boolean. Otherwise anything.
*/
static int jfes_is_boolean(const char *data, jfes_size_t length) {
if (!data) {
return 0;
}
if (length == 0) {
length = jfes_strlen(data);
}
return length == jfes_strlen(JFES_TRUE_VALUE) && jfes_memcmp(data, JFES_TRUE_VALUE, length) == 0 ||
length == jfes_strlen(JFES_FALSE_VALUE) && jfes_memcmp(data, JFES_FALSE_VALUE, length) == 0;
}
/**
Analyzes input string on the subject of whether it is an integer.
\param[in] data Input string.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Zero if input string is not an integer. Otherwise anything.
*/
static int jfes_is_integer(const char *data, jfes_size_t length) {
if (!data) {
return 0;
}
if (length == 0) {
length = jfes_strlen(data);
}
jfes_size_t offset = 0;
if (data[0] == '-') {
offset = 1;
}
int hexadecimal_case = 0;
if (length > offset + 2 && data[offset] == '0' &&
(data[offset + 1] == 'x' || data[offset + 1] == 'X')) {
hexadecimal_case = 1;
}
int is_integer = 1;
for (jfes_size_t i = offset; i < length; i++) {
if ((data[i] >= '0' && data[i] <= '9') || (hexadecimal_case &&
((data[i] >= 'A' && data[i] <= 'F') || (data[i] >= 'a' && data[i] <= 'f'))) ||
(i == offset + 1 && ((data[i] == 'x') || (data[i] == 'X')) && length > offset + 2)) {
if (hexadecimal_case && i == offset && data[i] != '0') {
is_integer = 0;
break;
}
continue;
}
is_integer = 0;
break;
}
return is_integer;
}
/**
Analyzes input string on the subject of whether it is a double.
\param[in] data Input string.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Zero if input string is not a double. Otherwise anything.
*/
static int jfes_is_double(const char *data, jfes_size_t length) {
if (!data) {
return 0;
}
if (length == 0) {
length = jfes_strlen(data);
}
jfes_size_t offset = 0;
if (data[0] == '-') {
offset = 1;
}
int dot_already_been = 0;
int exp_already_been = 0;
for (jfes_size_t i = offset; i < length; i++) {
if (data[i] < '0' || data[i] > '9') {
if (data[i] == '.' && !dot_already_been) {
dot_already_been = 1;
continue;
}
else if ((data[i] == 'e' || data[i] == 'E') && i + 2 < length &&
(data[i + 1] == '+' || data[i + 1] == '-') && !exp_already_been) {
exp_already_been = 1;
i++;
continue;
}
return 0;
}
}
return 1;
}
/**
Analyzes string and returns its boolean value.
\param[in] data String for analysis.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string;
\return 1 if data == 'true'. Otherwise 0.
*/
static int jfes_string_to_boolean(const char *data, jfes_size_t length) {
if (!data) {
return 0;
}
if (length == 0) {
length = jfes_strlen(data);
}
if (length == jfes_strlen(JFES_TRUE_VALUE) && jfes_memcmp(data, JFES_TRUE_VALUE, length) == 0) {
return 1;
}
return 0;
}
/**
Analyzes string and returns the integer type.
\param[in] data String for analysis.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Integer type.
*/
static jfes_integer_type_t jfes_get_integer_type(const char *data, jfes_size_t length) {
if (!data) {
return jfes_not_integer;
}
if (length == 0) {
length = jfes_strlen(data);
}
if (!jfes_is_integer(data, length)) {
return jfes_not_integer;
}
jfes_size_t offset = 0;
if (data[0] == '-') {
offset = 1;
}
if (length > offset + 2) {
if (data[offset] == '0') {
if (data[offset + 1] == 'x' || data[offset + 1] == 'X') {
return jfes_hexadecimal_integer;
}
return jfes_octal_integer;
}
}
return jfes_decimal_integer;
}
/**
Analyses string and returns its integer value.
\param[in] data String for analysis. Can be decimal, octal or hexadecimal.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Integer representation of the input data.
\warning This function doesn't check if the string is a correct integer, it's just ignoring
all incorrect characters. If you aren't sure of the correctness of the input arguments,
check them by `jfes_is_integer()` function.
*/
static int jfes_string_to_integer(const char *data, jfes_size_t length) {
if (!data) {
return 0;
}
if (length == 0) {
length = jfes_strlen(data);
}
int result = 0;
int sign = 1;
jfes_integer_type_t base = jfes_get_integer_type(data, length);
if (base == jfes_not_integer) {
return 0;
}
jfes_size_t offset = 0;
if (data[0] == '-') {
sign = -1;
offset = 1;
}
for (jfes_size_t i = offset; i < length; i++) {
char c = data[i];
if ((c >= '0' && c <= '9') || (base == jfes_hexadecimal_integer &&
((c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F')))) {
int value = 0;
if (c >= '0' && c <= '9') {
value = c - '0';
}
else if (c >= 'A' && c <= 'F') {
value = c - 'A' + 10;
}
else if (c >= 'a' && c <= 'f') {
value = c - 'a' + 10;
}
result = result * (int)base + value;
}
}
return result * sign;
}
/**
Analyses string and returns its double value.
\param[in] data String for analysis.
\param[in] length Optional. String length. You can pass zero
if `data` is a null-terminated string.
\return Double representation of the input data.
\warning This function doen't check that string is correct floating point value, it's just ignoring
all incorrect characters. If you aren't sure of the correctness of the input arguments,
check them by `jfes_is_double()` function.
*/
static double jfes_string_to_double(const char *data, jfes_size_t length) {
if (!data) {
return 0.0;
}
double result = 0.0;
double sign = 1.0;
int after_dot = 0;
int exp = 0;
int direction = 0;
jfes_size_t index = 0;
if (length == 0) {
length = jfes_strlen(data);
}
if (data[0] == '-') {
sign = -1.0;
index = 1;
}
for (; index < length; index++) {
char c = data[index];
if (c >= '0' && c <= '9') {
result = result * 10.0 + (c - '0');
if (after_dot) {
exp--;
}
}
else if (c == '.') {
after_dot = 1;
continue;
}
else if (index + 2 < length && (c == 'e' || c == 'E')) {
index++;
if (data[index] == '+') {
direction = 1;
index++;
}
else if (data[index] == '-') {
direction = -1;
index++;
}
break;
}
}
if (index < length) {
if (jfes_is_integer(data + index, length - index)) {
int new_exp = jfes_string_to_integer(data + index, length - index);
exp += direction * new_exp;
}
}
while (exp < 0) {
result /= 10.0;
exp++;
}
while (exp > 0) {
result *= 10.0;
exp--;
}
return sign * result;
}
/**
Returns boolean value as string.
\param[in] value Value to stringify.
\return String representation of the given value.
*/
static const char *jfes_boolean_to_string(int value) {
return value ? JFES_TRUE_VALUE : JFES_FALSE_VALUE;
}
/**
Thread safe version of the `jfes_integer_to_string`.
\param[in] value Value to stringify.
\param[out] output Output buffer to store result.
\param[in] output_size Maximal size of output buffer.
\return String representation of the given value.
\warning output_size must be greater than 1, because the output will be
null-terminated (if `output_size == 1`, then this single byte will be '\0').
*/
static char *jfes_integer_to_string_r(int value, char *output, jfes_size_t output_size) {
if (!output || output_size <= 1) {
return JFES_NULL;
}
char *p = &output[0] + output_size;
*--p = '\0';
jfes_size_t number_length = 0;
int sign = 1;
if (value < 0) {
sign = -1;
}
do {
*--p = '0' + (char)(sign * (value % 10));
value /= 10;
number_length++;
} while (value != 0 && p > output);
if (sign < 0 && p > output) {
*--p = '-';
number_length++;
}
if (p == output && value != 0) {
return JFES_NULL;
}
if (number_length + 1 < output_size) {
for (jfes_size_t i = 0; i < number_length + 1; i++) {
output[i] = *(p + i);
}
}
return output;
}
/**
Returns integer value as string.
\param[in] value Value to stringify.
\return String representation of the given value.
*/
static char *jfes_integer_to_string(int value) {
static char buf[JFES_MAX_DIGITS + 1];
return jfes_integer_to_string_r(value, &buf[0], JFES_MAX_DIGITS);
}
/**
Thread safe version of the `jfes_double_to_string`.
\param[in] value Value to stringify.
\param[out] output Output buffer to store result.
\param[in] output_size Maximal size of output buffer.
\param[in] precision_eps Double precision (like 0.00001).
\return String representation of the given value.
\warning output_size must be greater than 1, because the output will be
null-terminated (if `output_size == 1`, then this single byte will be '\0').
*/
static char *jfes_double_to_string_r(double value, char *output, jfes_size_t output_size, double precision_eps) {
if (!output || output_size <= 1) {
return JFES_NULL;
}
int int_value = (int)value;
double fractional_value = value - int_value;
if (fractional_value < 0) {
fractional_value = -fractional_value;
}
double precision = precision_eps;
while (precision < 1.0) {
fractional_value *= 10;
if (fractional_value - (int)fractional_value < precision_eps) {
break;
}
precision *= 10.0;
}
int fractional_int = (int)fractional_value;
char *int_value_s = jfes_integer_to_string_r(int_value, &output[0], output_size);
if (!int_value_s) {
return JFES_NULL;
}
jfes_size_t value_length = jfes_strlen(int_value_s);
output[value_length] = '.';
char *fractional_value_s = jfes_integer_to_string_r(fractional_int,
&output[value_length + 1], output_size - value_length - 1);
if (!fractional_value_s) {
return JFES_NULL;
}
return &output[0];
}
/**
Returns double value as string.
\param[in] value Value to stringify.
\return String representation of the given value.
*/
static char *jfes_double_to_string(double value) {
static char buf[JFES_MAX_DIGITS];
static double precision_eps = JFES_DOUBLE_PRECISION;
return jfes_double_to_string_r(value, &buf[0], JFES_MAX_DIGITS, precision_eps);
}
/**
Initializes jfes_stringstream object.
\param[out] stream Object to initialize.
\param[in] data Pointer to the memory.
\param[in] max_size Size of the allocated memory.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_initialize_stringstream(jfes_stringstream_t *stream, char *data, jfes_size_t max_size) {
if (!stream || !data || max_size == 0) {
return jfes_invalid_arguments;
}
stream->data = data;
stream->max_size = max_size;
stream->current_index = 0;
return jfes_success;
}
/**
Adds given data to the given stream.
\param[out] stream Stringstream object.
\param[in] data Data to add.
\param[in] data_length Optional. Child key length. You can pass 0
if the data string is zero-terminated.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_add_to_stringstream(jfes_stringstream_t *stream, const char *data, jfes_size_t data_length) {
if (!stream || !data) {
return jfes_invalid_arguments;
}
if (stream->current_index >= stream->max_size) {
return jfes_no_memory;
}
if (data_length == 0) {
data_length = jfes_strlen(data);
}
jfes_status_t status = jfes_success;
jfes_size_t size_to_add = data_length;
if (stream->current_index + size_to_add > stream->max_size) {
size_to_add = stream->max_size - stream->current_index;
status = jfes_no_memory;
}
jfes_memcpy(stream->data + stream->current_index, data, size_to_add);
stream->current_index += size_to_add;
return status;
}
/**
Allocates a fresh unused token from the token pool.
\param[in, out] parser Pointer to the jfes_parser_t object.
\param[in, out] tokens Tokens array.
\param[in] max_tokens Maximal tokens count.
\return Pointer to the allocated token from the token pool.
*/
static jfes_token_t *jfes_allocate_token(jfes_parser_t *parser, jfes_token_t *tokens, jfes_size_t max_tokens) {
if (!parser || !tokens || max_tokens == 0 || parser->next_token >= max_tokens) {
return JFES_NULL;
}
jfes_token_t *token = &tokens[parser->next_token++];
token->start = token->end = -1;
token->size = 0;
return token;
}
/**
Analyzes the source string and returns most likely type.
\param[in] data Source string bytes.
\param[in] length Source string length.
\return Most likely token type or `jfes_type_undefined`.
*/
static jfes_token_type_t jfes_get_token_type(const char *data, jfes_size_t length) {
if (!data || length == 0) {
return jfes_type_undefined;
}
if (jfes_is_null(data, length)) {
return jfes_type_null;
}
else if (jfes_is_boolean(data, length)) {
return jfes_type_boolean;
}
else if (jfes_is_integer(data, length)) {
return jfes_type_integer;
}
else if (jfes_is_double(data, length)) {
return jfes_type_double;
}
return jfes_type_undefined;
}
/**
Fills token type and boundaries.
\param[in, out] token Pointer to the token to fill.
\param[in] type Token type.
\param[in] start Token boundary start.
\param[in] end Token boundary end.
*/
static void jfes_fill_token(jfes_token_t *token, jfes_token_type_t type, int start, int end) {
if (token) {
token->type = type;
token->start = start;
token->end = end;
token->size = 0;
}
}
/**
Fills next available token with JSON primitive.
\param[in, out] parser Pointer to the jfes_parser_t object.
\param[in] json JSON data string.
\param[in] length JSON data length.
\param[out] tokens Tokens array to fill.
\param[in] max_tokens_count Maximal count of tokens in tokens array.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_parse_primitive(jfes_parser_t *parser, const char *json, jfes_size_t length,
jfes_token_t *tokens, jfes_size_t max_tokens_count) {
if (!parser || !json || length == 0 || !tokens || max_tokens_count == 0) {
return jfes_invalid_arguments;
}
int found = 0;
jfes_size_t start = parser->pos;
while (length && json[parser->pos] != '\0') {
char c = json[parser->pos];
if (c == '\t' || c == '\n' || c == '\r' || c == ' ' ||
c == ',' || c == ']' || c == '}'
#ifndef JFES_STRICT
|| c == ':'
#endif
) {
found = 1;
break;
}
parser->pos++;
}
#ifdef JFES_STRICT
if (!found) {
parser->pos = start;
return jfes_error_part;
}
#endif
jfes_token_t *token = jfes_allocate_token(parser, tokens, max_tokens_count);
if (!token) {
parser->pos = start;
return jfes_no_memory;
}
jfes_size_t token_length = parser->pos - start;
jfes_token_type_t type = jfes_get_token_type(json + start, token_length);
jfes_fill_token(token, type, start, parser->pos);
parser->pos--;
return jfes_success;
}
/**
Fills next available token with JSON string.
\param[in, out] parser Pointer to the jfes_parser_t object.
\param[in] json JSON data string.
\param[in] length JSON data length.
\param[out] tokens Tokens array to fill.
\param[in] max_tokens_count Maximal count of tokens in tokens array.
\return jfes_success if everything is OK.
*/
static jfes_status_t jfes_parse_string(jfes_parser_t *parser, const char *json, jfes_size_t length,
jfes_token_t *tokens, jfes_size_t max_tokens_count) {
if (!parser || !json || length == 0 || !tokens || max_tokens_count == 0) {
return jfes_invalid_arguments;
}
jfes_size_t start = parser->pos++;
while (parser->pos < length && json[parser->pos] != '\0') {
char c = json[parser->pos];
if (c == '\"') {
jfes_token_t *token = jfes_allocate_token(parser, tokens, max_tokens_count);
if (!token) {
parser->pos = start;
return jfes_no_memory;
}
jfes_fill_token(token, jfes_type_string, start + 1, parser->pos);
return jfes_success;
}
else if (c == '\\' && parser->pos + 1 < length) {
parser->pos++;
switch (json[parser->pos]) {
case '\"': case '/': case '\\': case 'b': case 'f':
case 'r': case 'n': case 't':
break;
case 'u':
parser->pos++;
for (jfes_size_t i = 0; i < 4 && parser->pos < length && json[parser->pos] != '\0'; i++, parser->pos++) {
char symbol = json[parser->pos];
if ((symbol < (int)'0' || symbol > (int)'9') &&
(symbol < (int)'A' || symbol > (int)'F') &&
(symbol < (int)'a' || symbol > (int)'f')) {
parser->pos = start;
return jfes_invalid_input;
}
}
parser->pos--;
break;
default:
parser->pos = start;
return jfes_invalid_input;
}
}
parser->pos++;
}
parser->pos = start;
return jfes_error_part;
}
int jfes_status_is_good(jfes_status_t status) {
return status == jfes_success;
}
int jfes_status_is_bad(jfes_status_t status) {
return !jfes_status_is_good(status);
}
jfes_status_t jfes_init_parser(jfes_parser_t *parser, const jfes_config_t *config) {
if (!parser || !config) {
return jfes_invalid_arguments;
}
parser->config = config;
return jfes_reset_parser(parser);
}
jfes_status_t jfes_reset_parser(jfes_parser_t *parser) {
if (!parser) {
return jfes_invalid_arguments;
}
parser->pos = 0;
parser->next_token = 0;
parser->superior_token = -1;
return jfes_success;
}
jfes_status_t jfes_parse_tokens(jfes_parser_t *parser, const char *json,
jfes_size_t length, jfes_token_t *tokens, jfes_size_t *max_tokens_count) {
if (!parser || !json || length == 0 || !tokens || !max_tokens_count || *max_tokens_count == 0) {
return jfes_invalid_arguments;
}
jfes_reset_parser(parser);
jfes_token_t *token = JFES_NULL;
jfes_size_t count = parser->next_token;
while (parser->pos < length && json[parser->pos] != '\0') {
char c = json[parser->pos];
switch (c) {
case '{': case '[':
{
count++;
token = jfes_allocate_token(parser, tokens, *max_tokens_count);
if (!token) {
return jfes_no_memory;
}
if (parser->superior_token != -1) {
tokens[parser->superior_token].size++;
}
token->type = (c == '{' ? jfes_type_object : jfes_type_array);
token->start = parser->pos;
parser->superior_token = parser->next_token - 1;
}
break;
case '}': case ']':
{
int i = 0;
for (i = (int)parser->next_token - 1; i >= 0; i--) {
token = &tokens[i];
if (token->start != -1 && token->end == -1) {
parser->superior_token = -1;
token->end = parser->pos + 1;
break;
}
}
if (i == -1) {
return jfes_invalid_input;
}
while (i >= 0) {
token = &tokens[i];
if (token->start != -1 && token->end == -1) {
parser->superior_token = i;
break;
}
i--;
}
}
break;
case '\"':
{