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/*
* blobmsg - library for generating/parsing structured blob messages
*
* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program 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.
*/
#ifndef __BLOBMSG_H
#define __BLOBMSG_H
#include "blob.h"
#define BLOBMSG_ALIGN 2
#define BLOBMSG_PADDING(len) (((len) + (1 << BLOBMSG_ALIGN) - 1) & ~((1 << BLOBMSG_ALIGN) - 1))
enum blobmsg_type {
BLOBMSG_TYPE_UNSPEC,
BLOBMSG_TYPE_ARRAY,
BLOBMSG_TYPE_TABLE,
BLOBMSG_TYPE_STRING,
BLOBMSG_TYPE_INT64,
BLOBMSG_TYPE_INT32,
BLOBMSG_TYPE_INT16,
BLOBMSG_TYPE_INT8,
__BLOBMSG_TYPE_LAST,
BLOBMSG_TYPE_LAST = __BLOBMSG_TYPE_LAST - 1
};
struct blobmsg_hdr {
uint16_t namelen;
uint8_t name[];
} __packed;
struct blobmsg_policy {
const char *name;
enum blobmsg_type type;
};
static inline int blobmsg_hdrlen(int namelen)
{
return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1);
}
static inline const char *blobmsg_name(const struct blob_attr *attr)
{
struct blobmsg_hdr *hdr = blob_data(attr);
return (const char *) hdr->name;
}
static inline void *blobmsg_data(const struct blob_attr *attr)
{
struct blobmsg_hdr *hdr = blob_data(attr);
return (char *) hdr + blobmsg_hdrlen(hdr->namelen);
}
static inline int blobmsg_data_len(const struct blob_attr *attr)
{
uint8_t *start, *end;
start = blob_data(attr);
end = blobmsg_data(attr);
return blob_len(attr) - (end - start);
}
bool blobmsg_check_attr(const struct blob_attr *attr, bool name);
int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
struct blob_attr **tb, void *data, int len);
int blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
const void *data, int len);
static inline int
blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val)
{
return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1);
}
static inline int
blobmsg_add_u16(struct blob_buf *buf, const char *name, uint16_t val)
{
return blobmsg_add_field(buf, BLOBMSG_TYPE_INT16, name, &val, 2);
}
static inline int
blobmsg_add_u32(struct blob_buf *buf, const char *name, uint32_t val)
{
return blobmsg_add_field(buf, BLOBMSG_TYPE_INT32, name, &val, 4);
}
static inline int
blobmsg_add_u64(struct blob_buf *buf, const char *name, uint64_t val)
{
return blobmsg_add_field(buf, BLOBMSG_TYPE_INT64, name, &val, 8);
}
static inline int
blobmsg_add_string(struct blob_buf *buf, const char *name, const char *string)
{
return blobmsg_add_field(buf, BLOBMSG_TYPE_STRING, name, string, strlen(string) + 1);
}
void *blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array);
static inline void *
blobmsg_open_array(struct blob_buf *buf, const char *name)
{
return blobmsg_open_nested(buf, name, true);
}
static inline void *
blobmsg_open_table(struct blob_buf *buf, const char *name)
{
return blobmsg_open_nested(buf, name, false);
}
static inline void
blobmsg_close_array(struct blob_buf *buf, void *cookie)
{
blob_nest_end(buf, cookie);
}
static inline void
blobmsg_close_table(struct blob_buf *buf, void *cookie)
{
blob_nest_end(buf, cookie);
}
static inline int blobmsg_buf_init(struct blob_buf *buf)
{
return blob_buf_init(buf, BLOBMSG_TYPE_TABLE);
}
void *blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, int maxlen);
void blobmsg_add_string_buffer(struct blob_buf *buf);
char *blobmsg_format_json(struct blob_attr *attr, bool list);
#define blobmsg_for_each_attr(pos, attr, rem) \
for (rem = blobmsg_data_len(attr), pos = blobmsg_data(attr); \
(blob_pad_len(pos) <= rem) && \
(blob_pad_len(pos) >= sizeof(struct blob_attr)); \
rem -= blob_pad_len(pos), pos = blob_next(pos))
#endif
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