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CloverBootloader/RedfishPkg/Library/JsonLib/load.c

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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.
(C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent AND MIT
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include "jansson_private.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 (code == json_error_invalid_syntax) {
/* More specific error code for premature end of file. */
code = json_error_premature_end_of_input;
}
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);
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;
#ifdef HAVE_UNISTD_H
if (input == stdin) {
source = "<stdin>";
} else
#endif
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
)
{
#ifdef HAVE_UNISTD_H
uint8_t c;
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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