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jansson/src/load.c
Corey Farrell bd91753e91 Remove extra reference actions in parsers. 
Make parse_object use json_object_set_new_nocheck and make parse_array
use json_array_append_new, remove json_decref from error and success
paths.

Fixes #376
2017-11-14 23:52:49 -05:00

1152 lines
28 KiB
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/*
* Copyright (c) 2009-2016 Petri Lehtinen <petri@digip.org>
*
* Jansson is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "jansson_private.h"
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "jansson.h"
#include "strbuffer.h"
#include "utf.h"
#define STREAM_STATE_OK 0
#define STREAM_STATE_EOF -1
#define STREAM_STATE_ERROR -2
#define TOKEN_INVALID -1
#define TOKEN_EOF 0
#define TOKEN_STRING 256
#define TOKEN_INTEGER 257
#define TOKEN_REAL 258
#define TOKEN_TRUE 259
#define TOKEN_FALSE 260
#define TOKEN_NULL 261
/* Locale independent versions of isxxx() functions */
#define l_isupper(c) ('A' <= (c) && (c) <= 'Z')
#define l_islower(c) ('a' <= (c) && (c) <= 'z')
#define l_isalpha(c) (l_isupper(c) || l_islower(c))
#define l_isdigit(c) ('0' <= (c) && (c) <= '9')
#define l_isxdigit(c) \
(l_isdigit(c) || ('A' <= (c) && (c) <= 'F') || ('a' <= (c) && (c) <= 'f'))
/* Read one byte from stream, convert to unsigned char, then int, and
return. return EOF on end of file. This corresponds to the
behaviour of fgetc(). */
typedef int (*get_func)(void *data);
typedef struct {
get_func get;
void *data;
char buffer[5];
size_t buffer_pos;
int state;
int line;
int column, last_column;
size_t position;
} stream_t;
typedef struct {
stream_t stream;
strbuffer_t saved_text;
size_t flags;
size_t depth;
int token;
union {
struct {
char *val;
size_t len;
} string;
json_int_t integer;
double real;
} value;
} lex_t;
#define stream_to_lex(stream) container_of(stream, lex_t, stream)
/*** error reporting ***/
static void error_set(json_error_t *error, const lex_t *lex,
enum json_error_code code,
const char *msg, ...)
{
va_list ap;
char msg_text[JSON_ERROR_TEXT_LENGTH];
char msg_with_context[JSON_ERROR_TEXT_LENGTH];
int line = -1, col = -1;
size_t pos = 0;
const char *result = msg_text;
if(!error)
return;
va_start(ap, msg);
vsnprintf(msg_text, JSON_ERROR_TEXT_LENGTH, msg, ap);
msg_text[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
va_end(ap);
if(lex)
{
const char *saved_text = strbuffer_value(&lex->saved_text);
line = lex->stream.line;
col = lex->stream.column;
pos = lex->stream.position;
if(saved_text && saved_text[0])
{
if(lex->saved_text.length <= 20) {
snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
"%s near '%s'", msg_text, saved_text);
msg_with_context[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
result = msg_with_context;
}
}
else
{
if(lex->stream.state == STREAM_STATE_ERROR) {
/* No context for UTF-8 decoding errors */
result = msg_text;
}
else {
snprintf(msg_with_context, JSON_ERROR_TEXT_LENGTH,
"%s near end of file", msg_text);
msg_with_context[JSON_ERROR_TEXT_LENGTH - 1] = '\0';
result = msg_with_context;
}
}
}
jsonp_error_set(error, line, col, pos, code, "%s", result);
}
/*** lexical analyzer ***/
static void
stream_init(stream_t *stream, get_func get, void *data)
{
stream->get = get;
stream->data = data;
stream->buffer[0] = '\0';
stream->buffer_pos = 0;
stream->state = STREAM_STATE_OK;
stream->line = 1;
stream->column = 0;
stream->position = 0;
}
static int stream_get(stream_t *stream, json_error_t *error)
{
int c;
if(stream->state != STREAM_STATE_OK)
return stream->state;
if(!stream->buffer[stream->buffer_pos])
{
c = stream->get(stream->data);
if(c == EOF) {
stream->state = STREAM_STATE_EOF;
return STREAM_STATE_EOF;
}
stream->buffer[0] = c;
stream->buffer_pos = 0;
if(0x80 <= c && c <= 0xFF)
{
/* multi-byte UTF-8 sequence */
size_t i, count;
count = utf8_check_first(c);
if(!count)
goto out;
assert(count >= 2);
for(i = 1; i < count; i++)
stream->buffer[i] = stream->get(stream->data);
if(!utf8_check_full(stream->buffer, count, NULL))
goto out;
stream->buffer[count] = '\0';
}
else
stream->buffer[1] = '\0';
}
c = stream->buffer[stream->buffer_pos++];
stream->position++;
if(c == '\n') {
stream->line++;
stream->last_column = stream->column;
stream->column = 0;
}
else if(utf8_check_first(c)) {
/* track the Unicode character column, so increment only if
this is the first character of a UTF-8 sequence */
stream->column++;
}
return c;
out:
stream->state = STREAM_STATE_ERROR;
error_set(error, stream_to_lex(stream), json_error_invalid_utf8, "unable to decode byte 0x%x", c);
return STREAM_STATE_ERROR;
}
static void stream_unget(stream_t *stream, int c)
{
if(c == STREAM_STATE_EOF || c == STREAM_STATE_ERROR)
return;
stream->position--;
if(c == '\n') {
stream->line--;
stream->column = stream->last_column;
}
else if(utf8_check_first(c))
stream->column--;
assert(stream->buffer_pos > 0);
stream->buffer_pos--;
assert(stream->buffer[stream->buffer_pos] == c);
}
static int lex_get(lex_t *lex, json_error_t *error)
{
return stream_get(&lex->stream, error);
}
static void lex_save(lex_t *lex, int c)
{
strbuffer_append_byte(&lex->saved_text, c);
}
static int lex_get_save(lex_t *lex, json_error_t *error)
{
int c = stream_get(&lex->stream, error);
if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR)
lex_save(lex, c);
return c;
}
static void lex_unget(lex_t *lex, int c)
{
stream_unget(&lex->stream, c);
}
static void lex_unget_unsave(lex_t *lex, int c)
{
if(c != STREAM_STATE_EOF && c != STREAM_STATE_ERROR) {
/* Since we treat warnings as errors, when assertions are turned
* off the "d" variable would be set but never used. Which is
* treated as an error by GCC.
*/
#ifndef NDEBUG
char d;
#endif
stream_unget(&lex->stream, c);
#ifndef NDEBUG
d =
#endif
strbuffer_pop(&lex->saved_text);
assert(c == d);
}
}
static void lex_save_cached(lex_t *lex)
{
while(lex->stream.buffer[lex->stream.buffer_pos] != '\0')
{
lex_save(lex, lex->stream.buffer[lex->stream.buffer_pos]);
lex->stream.buffer_pos++;
lex->stream.position++;
}
}
static void lex_free_string(lex_t *lex)
{
jsonp_free(lex->value.string.val);
lex->value.string.val = NULL;
lex->value.string.len = 0;
}
/* assumes that str points to 'u' plus at least 4 valid hex digits */
static int32_t decode_unicode_escape(const char *str)
{
int i;
int32_t value = 0;
assert(str[0] == 'u');
for(i = 1; i <= 4; i++) {
char c = str[i];
value <<= 4;
if(l_isdigit(c))
value += c - '0';
else if(l_islower(c))
value += c - 'a' + 10;
else if(l_isupper(c))
value += c - 'A' + 10;
else
return -1;
}
return value;
}
static void lex_scan_string(lex_t *lex, json_error_t *error)
{
int c;
const char *p;
char *t;
int i;
lex->value.string.val = NULL;
lex->token = TOKEN_INVALID;
c = lex_get_save(lex, error);
while(c != '"') {
if(c == STREAM_STATE_ERROR)
goto out;
else if(c == STREAM_STATE_EOF) {
error_set(error, lex, json_error_premature_end_of_input, "premature end of input");
goto out;
}
else if(0 <= c && c <= 0x1F) {
/* control character */
lex_unget_unsave(lex, c);
if(c == '\n')
error_set(error, lex, json_error_invalid_syntax, "unexpected newline");
else
error_set(error, lex, json_error_invalid_syntax, "control character 0x%x", c);
goto out;
}
else if(c == '\\') {
c = lex_get_save(lex, error);
if(c == 'u') {
c = lex_get_save(lex, error);
for(i = 0; i < 4; i++) {
if(!l_isxdigit(c)) {
error_set(error, lex, json_error_invalid_syntax, "invalid escape");
goto out;
}
c = lex_get_save(lex, error);
}
}
else if(c == '"' || c == '\\' || c == '/' || c == 'b' ||
c == 'f' || c == 'n' || c == 'r' || c == 't')
c = lex_get_save(lex, error);
else {
error_set(error, lex, json_error_invalid_syntax, "invalid escape");
goto out;
}
}
else
c = lex_get_save(lex, error);
}
/* the actual value is at most of the same length as the source
string, because:
- shortcut escapes (e.g. "\t") (length 2) are converted to 1 byte
- a single \uXXXX escape (length 6) is converted to at most 3 bytes
- two \uXXXX escapes (length 12) forming an UTF-16 surrogate pair
are converted to 4 bytes
*/
t = jsonp_malloc(lex->saved_text.length + 1);
if(!t) {
/* this is not very nice, since TOKEN_INVALID is returned */
goto out;
}
lex->value.string.val = t;
/* + 1 to skip the " */
p = strbuffer_value(&lex->saved_text) + 1;
while(*p != '"') {
if(*p == '\\') {
p++;
if(*p == 'u') {
size_t length;
int32_t value;
value = decode_unicode_escape(p);
if(value < 0) {
error_set(error, lex, json_error_invalid_syntax, "invalid Unicode escape '%.6s'", p - 1);
goto out;
}
p += 5;
if(0xD800 <= value && value <= 0xDBFF) {
/* surrogate pair */
if(*p == '\\' && *(p + 1) == 'u') {
int32_t value2 = decode_unicode_escape(++p);
if(value2 < 0) {
error_set(error, lex, json_error_invalid_syntax, "invalid Unicode escape '%.6s'", p - 1);
goto out;
}
p += 5;
if(0xDC00 <= value2 && value2 <= 0xDFFF) {
/* valid second surrogate */
value =
((value - 0xD800) << 10) +
(value2 - 0xDC00) +
0x10000;
}
else {
/* invalid second surrogate */
error_set(error, lex,
json_error_invalid_syntax,
"invalid Unicode '\\u%04X\\u%04X'",
value, value2);
goto out;
}
}
else {
/* no second surrogate */
error_set(error, lex, json_error_invalid_syntax, "invalid Unicode '\\u%04X'",
value);
goto out;
}
}
else if(0xDC00 <= value && value <= 0xDFFF) {
error_set(error, lex, json_error_invalid_syntax, "invalid Unicode '\\u%04X'", value);
goto out;
}
if(utf8_encode(value, t, &length))
assert(0);
t += length;
}
else {
switch(*p) {
case '"': case '\\': case '/':
*t = *p; break;
case 'b': *t = '\b'; break;
case 'f': *t = '\f'; break;
case 'n': *t = '\n'; break;
case 'r': *t = '\r'; break;
case 't': *t = '\t'; break;
default: assert(0);
}
t++;
p++;
}
}
else
*(t++) = *(p++);
}
*t = '\0';
lex->value.string.len = t - lex->value.string.val;
lex->token = TOKEN_STRING;
return;
out:
lex_free_string(lex);
}
#ifndef JANSSON_USING_CMAKE /* disabled if using cmake */
#if JSON_INTEGER_IS_LONG_LONG
#ifdef _MSC_VER /* Microsoft Visual Studio */
#define json_strtoint _strtoi64
#else
#define json_strtoint strtoll
#endif
#else
#define json_strtoint strtol
#endif
#endif
static int lex_scan_number(lex_t *lex, int c, json_error_t *error)
{
const char *saved_text;
char *end;
double doubleval;
lex->token = TOKEN_INVALID;
if(c == '-')
c = lex_get_save(lex, error);
if(c == '0') {
c = lex_get_save(lex, error);
if(l_isdigit(c)) {
lex_unget_unsave(lex, c);
goto out;
}
}
else if(l_isdigit(c)) {
do
c = lex_get_save(lex, error);
while(l_isdigit(c));
}
else {
lex_unget_unsave(lex, c);
goto out;
}
if(!(lex->flags & JSON_DECODE_INT_AS_REAL) &&
c != '.' && c != 'E' && c != 'e')
{
json_int_t intval;
lex_unget_unsave(lex, c);
saved_text = strbuffer_value(&lex->saved_text);
errno = 0;
intval = json_strtoint(saved_text, &end, 10);
if(errno == ERANGE) {
if(intval < 0)
error_set(error, lex, json_error_numeric_overflow, "too big negative integer");
else
error_set(error, lex, json_error_numeric_overflow, "too big integer");
goto out;
}
assert(end == saved_text + lex->saved_text.length);
lex->token = TOKEN_INTEGER;
lex->value.integer = intval;
return 0;
}
if(c == '.') {
c = lex_get(lex, error);
if(!l_isdigit(c)) {
lex_unget(lex, c);
goto out;
}
lex_save(lex, c);
do
c = lex_get_save(lex, error);
while(l_isdigit(c));
}
if(c == 'E' || c == 'e') {
c = lex_get_save(lex, error);
if(c == '+' || c == '-')
c = lex_get_save(lex, error);
if(!l_isdigit(c)) {
lex_unget_unsave(lex, c);
goto out;
}
do
c = lex_get_save(lex, error);
while(l_isdigit(c));
}
lex_unget_unsave(lex, c);
if(jsonp_strtod(&lex->saved_text, &doubleval)) {
error_set(error, lex, json_error_numeric_overflow, "real number overflow");
goto out;
}
lex->token = TOKEN_REAL;
lex->value.real = doubleval;
return 0;
out:
return -1;
}
static int lex_scan(lex_t *lex, json_error_t *error)
{
int c;
strbuffer_clear(&lex->saved_text);
if(lex->token == TOKEN_STRING)
lex_free_string(lex);
do
c = lex_get(lex, error);
while(c == ' ' || c == '\t' || c == '\n' || c == '\r');
if(c == STREAM_STATE_EOF) {
lex->token = TOKEN_EOF;
goto out;
}
if(c == STREAM_STATE_ERROR) {
lex->token = TOKEN_INVALID;
goto out;
}
lex_save(lex, c);
if(c == '{' || c == '}' || c == '[' || c == ']' || c == ':' || c == ',')
lex->token = c;
else if(c == '"')
lex_scan_string(lex, error);
else if(l_isdigit(c) || c == '-') {
if(lex_scan_number(lex, c, error))
goto out;
}
else if(l_isalpha(c)) {
/* eat up the whole identifier for clearer error messages */
const char *saved_text;
do
c = lex_get_save(lex, error);
while(l_isalpha(c));
lex_unget_unsave(lex, c);
saved_text = strbuffer_value(&lex->saved_text);
if(strcmp(saved_text, "true") == 0)
lex->token = TOKEN_TRUE;
else if(strcmp(saved_text, "false") == 0)
lex->token = TOKEN_FALSE;
else if(strcmp(saved_text, "null") == 0)
lex->token = TOKEN_NULL;
else
lex->token = TOKEN_INVALID;
}
else {
/* save the rest of the input UTF-8 sequence to get an error
message of valid UTF-8 */
lex_save_cached(lex);
lex->token = TOKEN_INVALID;
}
out:
return lex->token;
}
static char *lex_steal_string(lex_t *lex, size_t *out_len)
{
char *result = NULL;
if(lex->token == TOKEN_STRING) {
result = lex->value.string.val;
*out_len = lex->value.string.len;
lex->value.string.val = NULL;
lex->value.string.len = 0;
}
return result;
}
static int lex_init(lex_t *lex, get_func get, size_t flags, void *data)
{
stream_init(&lex->stream, get, data);
if(strbuffer_init(&lex->saved_text))
return -1;
lex->flags = flags;
lex->token = TOKEN_INVALID;
return 0;
}
static void lex_close(lex_t *lex)
{
if(lex->token == TOKEN_STRING)
lex_free_string(lex);
strbuffer_close(&lex->saved_text);
}
/*** parser ***/
static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error);
static json_t *parse_object(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *object = json_object();
if(!object)
return NULL;
lex_scan(lex, error);
if(lex->token == '}')
return object;
while(1) {
char *key;
size_t len;
json_t *value;
if(lex->token != TOKEN_STRING) {
error_set(error, lex, json_error_invalid_syntax, "string or '}' expected");
goto error;
}
key = lex_steal_string(lex, &len);
if(!key)
return NULL;
if (memchr(key, '\0', len)) {
jsonp_free(key);
error_set(error, lex, json_error_null_byte_in_key, "NUL byte in object key not supported");
goto error;
}
if(flags & JSON_REJECT_DUPLICATES) {
if(json_object_get(object, key)) {
jsonp_free(key);
error_set(error, lex, json_error_duplicate_key, "duplicate object key");
goto error;
}
}
lex_scan(lex, error);
if(lex->token != ':') {
jsonp_free(key);
error_set(error, lex, json_error_invalid_syntax, "':' expected");
goto error;
}
lex_scan(lex, error);
value = parse_value(lex, flags, error);
if(!value) {
jsonp_free(key);
goto error;
}
if(json_object_set_new_nocheck(object, key, value)) {
jsonp_free(key);
goto error;
}
jsonp_free(key);
lex_scan(lex, error);
if(lex->token != ',')
break;
lex_scan(lex, error);
}
if(lex->token != '}') {
error_set(error, lex, json_error_invalid_syntax, "'}' expected");
goto error;
}
return object;
error:
json_decref(object);
return NULL;
}
static json_t *parse_array(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *array = json_array();
if(!array)
return NULL;
lex_scan(lex, error);
if(lex->token == ']')
return array;
while(lex->token) {
json_t *elem = parse_value(lex, flags, error);
if(!elem)
goto error;
if(json_array_append_new(array, elem)) {
goto error;
}
lex_scan(lex, error);
if(lex->token != ',')
break;
lex_scan(lex, error);
}
if(lex->token != ']') {
error_set(error, lex, json_error_invalid_syntax, "']' expected");
goto error;
}
return array;
error:
json_decref(array);
return NULL;
}
static json_t *parse_value(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *json;
lex->depth++;
if(lex->depth > JSON_PARSER_MAX_DEPTH) {
error_set(error, lex, json_error_stack_overflow, "maximum parsing depth reached");
return NULL;
}
switch(lex->token) {
case TOKEN_STRING: {
const char *value = lex->value.string.val;
size_t len = lex->value.string.len;
if(!(flags & JSON_ALLOW_NUL)) {
if(memchr(value, '\0', len)) {
error_set(error, lex, json_error_null_character, "\\u0000 is not allowed without JSON_ALLOW_NUL");
return NULL;
}
}
json = jsonp_stringn_nocheck_own(value, len);
if(json) {
lex->value.string.val = NULL;
lex->value.string.len = 0;
}
break;
}
case TOKEN_INTEGER: {
json = json_integer(lex->value.integer);
break;
}
case TOKEN_REAL: {
json = json_real(lex->value.real);
break;
}
case TOKEN_TRUE:
json = json_true();
break;
case TOKEN_FALSE:
json = json_false();
break;
case TOKEN_NULL:
json = json_null();
break;
case '{':
json = parse_object(lex, flags, error);
break;
case '[':
json = parse_array(lex, flags, error);
break;
case TOKEN_INVALID:
error_set(error, lex, json_error_invalid_syntax, "invalid token");
return NULL;
default:
error_set(error, lex, json_error_invalid_syntax, "unexpected token");
return NULL;
}
if(!json)
return NULL;
lex->depth--;
return json;
}
static json_t *parse_json(lex_t *lex, size_t flags, json_error_t *error)
{
json_t *result;
lex->depth = 0;
lex_scan(lex, error);
if(!(flags & JSON_DECODE_ANY)) {
if(lex->token != '[' && lex->token != '{') {
error_set(error, lex, json_error_invalid_syntax, "'[' or '{' expected");
return NULL;
}
}
result = parse_value(lex, flags, error);
if(!result)
return NULL;
if(!(flags & JSON_DISABLE_EOF_CHECK)) {
lex_scan(lex, error);
if(lex->token != TOKEN_EOF) {
error_set(error, lex, json_error_end_of_input_expected, "end of file expected");
json_decref(result);
return NULL;
}
}
if(error) {
/* Save the position even though there was no error */
error->position = (int)lex->stream.position;
}
return result;
}
typedef struct
{
const char *data;
size_t pos;
} string_data_t;
static int string_get(void *data)
{
char c;
string_data_t *stream = (string_data_t *)data;
c = stream->data[stream->pos];
if(c == '\0')
return EOF;
else
{
stream->pos++;
return (unsigned char)c;
}
}
json_t *json_loads(const char *string, size_t flags, json_error_t *error)
{
lex_t lex;
json_t *result;
string_data_t stream_data;
jsonp_error_init(error, "<string>");
if (string == NULL) {
error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
return NULL;
}
stream_data.data = string;
stream_data.pos = 0;
if(lex_init(&lex, string_get, flags, (void *)&stream_data))
return NULL;
result = parse_json(&lex, flags, error);
lex_close(&lex);
return result;
}
typedef struct
{
const char *data;
size_t len;
size_t pos;
} buffer_data_t;
static int buffer_get(void *data)
{
char c;
buffer_data_t *stream = data;
if(stream->pos >= stream->len)
return EOF;
c = stream->data[stream->pos];
stream->pos++;
return (unsigned char)c;
}
json_t *json_loadb(const char *buffer, size_t buflen, size_t flags, json_error_t *error)
{
lex_t lex;
json_t *result;
buffer_data_t stream_data;
jsonp_error_init(error, "<buffer>");
if (buffer == NULL) {
error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
return NULL;
}
stream_data.data = buffer;
stream_data.pos = 0;
stream_data.len = buflen;
if(lex_init(&lex, buffer_get, flags, (void *)&stream_data))
return NULL;
result = parse_json(&lex, flags, error);
lex_close(&lex);
return result;
}
json_t *json_loadf(FILE *input, size_t flags, json_error_t *error)
{
lex_t lex;
const char *source;
json_t *result;
if(input == stdin)
source = "<stdin>";
else
source = "<stream>";
jsonp_error_init(error, source);
if (input == NULL) {
error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
return NULL;
}
if(lex_init(&lex, (get_func)fgetc, flags, input))
return NULL;
result = parse_json(&lex, flags, error);
lex_close(&lex);
return result;
}
static int fd_get_func(int *fd)
{
uint8_t c;
#ifdef HAVE_UNISTD_H
if (read(*fd, &c, 1) == 1)
return c;
#endif
return EOF;
}
json_t *json_loadfd(int input, size_t flags, json_error_t *error)
{
lex_t lex;
const char *source;
json_t *result;
#ifdef HAVE_UNISTD_H
if(input == STDIN_FILENO)
source = "<stdin>";
else
#endif
source = "<stream>";
jsonp_error_init(error, source);
if (input < 0) {
error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
return NULL;
}
if(lex_init(&lex, (get_func)fd_get_func, flags, &input))
return NULL;
result = parse_json(&lex, flags, error);
lex_close(&lex);
return result;
}
json_t *json_load_file(const char *path, size_t flags, json_error_t *error)
{
json_t *result;
FILE *fp;
jsonp_error_init(error, path);
if (path == NULL) {
error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
return NULL;
}
fp = fopen(path, "rb");
if(!fp)
{
error_set(error, NULL, json_error_cannot_open_file, "unable to open %s: %s",
path, strerror(errno));
return NULL;
}
result = json_loadf(fp, flags, error);
fclose(fp);
return result;
}
#define MAX_BUF_LEN 1024
typedef struct
{
char data[MAX_BUF_LEN];
size_t len;
size_t pos;
json_load_callback_t callback;
void *arg;
} callback_data_t;
static int callback_get(void *data)
{
char c;
callback_data_t *stream = data;
if(stream->pos >= stream->len) {
stream->pos = 0;
stream->len = stream->callback(stream->data, MAX_BUF_LEN, stream->arg);
if(stream->len == 0 || stream->len == (size_t)-1)
return EOF;
}
c = stream->data[stream->pos];
stream->pos++;
return (unsigned char)c;
}
json_t *json_load_callback(json_load_callback_t callback, void *arg, size_t flags, json_error_t *error)
{
lex_t lex;
json_t *result;
callback_data_t stream_data;
memset(&stream_data, 0, sizeof(stream_data));
stream_data.callback = callback;
stream_data.arg = arg;
jsonp_error_init(error, "<callback>");
if (callback == NULL) {
error_set(error, NULL, json_error_invalid_argument, "wrong arguments");
return NULL;
}
if(lex_init(&lex, (get_func)callback_get, flags, &stream_data))
return NULL;
result = parse_json(&lex, flags, error);
lex_close(&lex);
return result;
}
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