c6a84545a3
While the newly added jsmn library provides the parsing interface, it does not provide any kind of interface to act on parsed tokens. Instead, the caller is expected to handle pointer arithmetics inside of the token array in order to extract required information. While simple, this requires users to know some of the inner workings of the library and is thus quite an unintuitive interface. This commit adds a new interface on top of the jsmn parser that provides convenience functions to retrieve values from the parsed json type, grub_json_t. Signed-off-by: Patrick Steinhardt <ps@pks.im> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2019 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef GRUB_JSON_JSON_H
|
|
#define GRUB_JSON_JSON_H 1
|
|
|
|
#include <grub/types.h>
|
|
|
|
enum grub_json_type
|
|
{
|
|
/* Unordered collection of key-value pairs. */
|
|
GRUB_JSON_OBJECT,
|
|
/* Ordered list of zero or more values. */
|
|
GRUB_JSON_ARRAY,
|
|
/* Zero or more Unicode characters. */
|
|
GRUB_JSON_STRING,
|
|
/* Number, boolean or empty value. */
|
|
GRUB_JSON_PRIMITIVE,
|
|
/* Invalid token. */
|
|
GRUB_JSON_UNDEFINED,
|
|
};
|
|
typedef enum grub_json_type grub_json_type_t;
|
|
|
|
struct grub_json
|
|
{
|
|
void *tokens;
|
|
char *string;
|
|
grub_size_t idx;
|
|
};
|
|
typedef struct grub_json grub_json_t;
|
|
|
|
/*
|
|
* Parse a JSON-encoded string. Note that the string passed to
|
|
* this function will get modified on subsequent calls to
|
|
* grub_json_get*(). Returns the root object of the parsed JSON
|
|
* object, which needs to be free'd via grub_json_free().
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_parse) (grub_json_t **out,
|
|
char *string,
|
|
grub_size_t string_len);
|
|
|
|
/*
|
|
* Free the structure and its contents. The string passed to
|
|
* grub_json_parse() will not be free'd.
|
|
*/
|
|
extern void EXPORT_FUNC(grub_json_free) (grub_json_t *json);
|
|
|
|
/*
|
|
* Get the child count of a valid grub_json_t instance. Children
|
|
* are present for arrays, objects (dicts) and keys of a dict.
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_getsize) (grub_size_t *out,
|
|
const grub_json_t *json);
|
|
|
|
/* Get the type of a valid grub_json_t instance. */
|
|
extern grub_err_t EXPORT_FUNC(grub_json_gettype) (grub_json_type_t *out,
|
|
const grub_json_t *json);
|
|
|
|
/*
|
|
* Get n'th child of a valid object, array or key. Will return an
|
|
* error if no such child exists. The result does not need to be
|
|
* free'd.
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_getchild) (grub_json_t *out,
|
|
const grub_json_t *parent,
|
|
grub_size_t n);
|
|
|
|
/*
|
|
* Get value of key from a valid grub_json_t instance. The result
|
|
* does not need to be free'd.
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_getvalue) (grub_json_t *out,
|
|
const grub_json_t *parent,
|
|
const char *key);
|
|
|
|
/*
|
|
* Get the string representation of a valid grub_json_t instance.
|
|
* If a key is given and parent is a JSON object, this function
|
|
* will return the string value of a child mapping to the key.
|
|
* If no key is given, it will return the string value of the
|
|
* parent itself.
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_getstring) (const char **out,
|
|
const grub_json_t *parent,
|
|
const char *key);
|
|
|
|
/*
|
|
* Get the uint64 representation of a valid grub_json_t instance.
|
|
* Returns an error if the value pointed to by `parent` cannot be
|
|
* converted to an uint64. See grub_json_getstring() for details
|
|
* on the key parameter.
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_getuint64) (grub_uint64_t *out,
|
|
const grub_json_t *parent,
|
|
const char *key);
|
|
|
|
/*
|
|
* Get the int64 representation of a valid grub_json_t instance.
|
|
* Returns an error if the value pointed to by `parent` cannot be
|
|
* converted to an int64. See grub_json_getstring() for
|
|
* details on the key parameter.
|
|
*/
|
|
extern grub_err_t EXPORT_FUNC(grub_json_getint64) (grub_int64_t *out,
|
|
const grub_json_t *parent,
|
|
const char *key);
|
|
|
|
#endif
|