238 lines
6.6 KiB
C
238 lines
6.6 KiB
C
/*
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* Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef __BLOBMSG_H
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#define __BLOBMSG_H
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#include <stdarg.h>
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#include "blob.h"
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#define BLOBMSG_ALIGN 2
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#define BLOBMSG_PADDING(len) (((len) + (1 << BLOBMSG_ALIGN) - 1) & ~((1 << BLOBMSG_ALIGN) - 1))
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enum blobmsg_type {
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BLOBMSG_TYPE_UNSPEC,
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BLOBMSG_TYPE_ARRAY,
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BLOBMSG_TYPE_TABLE,
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BLOBMSG_TYPE_STRING,
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BLOBMSG_TYPE_INT64,
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BLOBMSG_TYPE_INT32,
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BLOBMSG_TYPE_INT16,
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BLOBMSG_TYPE_INT8,
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__BLOBMSG_TYPE_LAST,
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BLOBMSG_TYPE_LAST = __BLOBMSG_TYPE_LAST - 1,
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BLOBMSG_TYPE_BOOL = BLOBMSG_TYPE_INT8,
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};
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struct blobmsg_hdr {
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uint16_t namelen;
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uint8_t name[];
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} __packed;
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struct blobmsg_policy {
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const char *name;
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enum blobmsg_type type;
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};
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static inline int blobmsg_hdrlen(unsigned int namelen)
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{
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return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1);
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}
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static inline void blobmsg_clear_name(struct blob_attr *attr)
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{
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struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
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hdr->name[0] = 0;
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}
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static inline const char *blobmsg_name(const struct blob_attr *attr)
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{
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struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
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return (const char *) hdr->name;
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}
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static inline int blobmsg_type(const struct blob_attr *attr)
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{
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return blob_id(attr);
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}
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static inline void *blobmsg_data(const struct blob_attr *attr)
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{
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struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
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char *data = (char *) blob_data(attr);
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if (blob_is_extended(attr))
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data += blobmsg_hdrlen(be16_to_cpu(hdr->namelen));
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return data;
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}
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static inline int blobmsg_data_len(const struct blob_attr *attr)
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{
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uint8_t *start, *end;
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start = (uint8_t *) blob_data(attr);
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end = (uint8_t *) blobmsg_data(attr);
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return blob_len(attr) - (end - start);
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}
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static inline int blobmsg_len(const struct blob_attr *attr)
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{
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return blobmsg_data_len(attr);
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}
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bool blobmsg_check_attr(const struct blob_attr *attr, bool name);
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bool blobmsg_check_attr_list(const struct blob_attr *attr, int type);
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/*
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* blobmsg_check_array: validate array/table and return size
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*
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* Checks if all elements of an array or table are valid and have
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* the specified type. Returns the number of elements in the array
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*/
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int blobmsg_check_array(const struct blob_attr *attr, int type);
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int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
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struct blob_attr **tb, void *data, unsigned int len);
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int blobmsg_parse_array(const struct blobmsg_policy *policy, int policy_len,
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struct blob_attr **tb, void *data, unsigned int len);
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int blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
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const void *data, unsigned int len);
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static inline int
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blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val)
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{
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return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1);
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}
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static inline int
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blobmsg_add_u16(struct blob_buf *buf, const char *name, uint16_t val)
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{
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val = cpu_to_be16(val);
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return blobmsg_add_field(buf, BLOBMSG_TYPE_INT16, name, &val, 2);
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}
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static inline int
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blobmsg_add_u32(struct blob_buf *buf, const char *name, uint32_t val)
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{
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val = cpu_to_be32(val);
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return blobmsg_add_field(buf, BLOBMSG_TYPE_INT32, name, &val, 4);
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}
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static inline int
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blobmsg_add_u64(struct blob_buf *buf, const char *name, uint64_t val)
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{
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val = cpu_to_be64(val);
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return blobmsg_add_field(buf, BLOBMSG_TYPE_INT64, name, &val, 8);
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}
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static inline int
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blobmsg_add_string(struct blob_buf *buf, const char *name, const char *string)
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{
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return blobmsg_add_field(buf, BLOBMSG_TYPE_STRING, name, string, strlen(string) + 1);
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}
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static inline int
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blobmsg_add_blob(struct blob_buf *buf, struct blob_attr *attr)
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{
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return blobmsg_add_field(buf, blobmsg_type(attr), blobmsg_name(attr),
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blobmsg_data(attr), blobmsg_data_len(attr));
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}
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void *blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array);
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static inline void *
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blobmsg_open_array(struct blob_buf *buf, const char *name)
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{
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return blobmsg_open_nested(buf, name, true);
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}
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static inline void *
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blobmsg_open_table(struct blob_buf *buf, const char *name)
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{
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return blobmsg_open_nested(buf, name, false);
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}
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static inline void
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blobmsg_close_array(struct blob_buf *buf, void *cookie)
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{
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blob_nest_end(buf, cookie);
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}
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static inline void
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blobmsg_close_table(struct blob_buf *buf, void *cookie)
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{
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blob_nest_end(buf, cookie);
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}
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static inline int blobmsg_buf_init(struct blob_buf *buf)
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{
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return blob_buf_init(buf, BLOBMSG_TYPE_TABLE);
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}
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static inline uint8_t blobmsg_get_u8(struct blob_attr *attr)
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{
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return *(uint8_t *) blobmsg_data(attr);
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}
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static inline bool blobmsg_get_bool(struct blob_attr *attr)
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{
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return *(uint8_t *) blobmsg_data(attr);
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}
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static inline uint16_t blobmsg_get_u16(struct blob_attr *attr)
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{
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return be16_to_cpu(*(uint16_t *) blobmsg_data(attr));
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}
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static inline uint32_t blobmsg_get_u32(struct blob_attr *attr)
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{
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return be32_to_cpu(*(uint32_t *) blobmsg_data(attr));
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}
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static inline uint64_t blobmsg_get_u64(struct blob_attr *attr)
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{
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uint32_t *ptr = (uint32_t *) blobmsg_data(attr);
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uint64_t tmp = ((uint64_t) be32_to_cpu(ptr[0])) << 32;
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tmp |= be32_to_cpu(ptr[1]);
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return tmp;
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}
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static inline char *blobmsg_get_string(struct blob_attr *attr)
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{
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return (char *) blobmsg_data(attr);
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}
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void *blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, unsigned int maxlen);
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void *blobmsg_realloc_string_buffer(struct blob_buf *buf, unsigned int maxlen);
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void blobmsg_add_string_buffer(struct blob_buf *buf);
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void blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg);
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void blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...)
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__attribute__((format(printf, 3, 4)));
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/* blobmsg to json formatting */
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#define blobmsg_for_each_attr(pos, attr, rem) \
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for (rem = attr ? blobmsg_data_len(attr) : 0, \
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pos = attr ? blobmsg_data(attr) : 0; \
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rem > 0 && (blob_pad_len(pos) <= rem) && \
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(blob_pad_len(pos) >= sizeof(struct blob_attr)); \
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rem -= blob_pad_len(pos), pos = blob_next(pos))
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#endif
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