release/src/router/uqmi/libubox/blobmsg.h

   1 /*
   2  * Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #ifndef __BLOBMSG_H
  17 #define __BLOBMSG_H
  18
  19 #include <stdarg.h>
  20 #include "blob.h"
  21
  22 #define BLOBMSG_ALIGN   2
  23 #define BLOBMSG_PADDING(len) (((len) + (1 << BLOBMSG_ALIGN) - 1) & ~((1 << BLOBMSG_ALIGN) - 1))
  24
  25 enum blobmsg_type {
  26         BLOBMSG_TYPE_UNSPEC,
  27         BLOBMSG_TYPE_ARRAY,
  28         BLOBMSG_TYPE_TABLE,
  29         BLOBMSG_TYPE_STRING,
  30         BLOBMSG_TYPE_INT64,
  31         BLOBMSG_TYPE_INT32,
  32         BLOBMSG_TYPE_INT16,
  33         BLOBMSG_TYPE_INT8,
  34         __BLOBMSG_TYPE_LAST,
  35         BLOBMSG_TYPE_LAST = __BLOBMSG_TYPE_LAST - 1,
  36         BLOBMSG_TYPE_BOOL = BLOBMSG_TYPE_INT8,
  37 };
  38
  39 struct blobmsg_hdr {
  40         uint16_t namelen;
  41         uint8_t name[];
  42 } __packed;
  43
  44 struct blobmsg_policy {
  45         const char *name;
  46         enum blobmsg_type type;
  47 };
  48
  49 static inline int blobmsg_hdrlen(unsigned int namelen)
  50 {
  51         return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1);
  52 }
  53
  54 static inline void blobmsg_clear_name(struct blob_attr *attr)
  55 {
  56         struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
  57         hdr->name[0] = 0;
  58 }
  59
  60 static inline const char *blobmsg_name(const struct blob_attr *attr)
  61 {
  62         struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
  63         return (const char *) hdr->name;
  64 }
  65
  66 static inline int blobmsg_type(const struct blob_attr *attr)
  67 {
  68         return blob_id(attr);
  69 }
  70
  71 static inline void *blobmsg_data(const struct blob_attr *attr)
  72 {
  73         struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr);
  74         char *data = (char *) blob_data(attr);
  75
  76         if (blob_is_extended(attr))
  77                 data += blobmsg_hdrlen(be16_to_cpu(hdr->namelen));
  78
  79         return data;
  80 }
  81
  82 static inline int blobmsg_data_len(const struct blob_attr *attr)
  83 {
  84         uint8_t *start, *end;
  85
  86         start = (uint8_t *) blob_data(attr);
  87         end = (uint8_t *) blobmsg_data(attr);
  88
  89         return blob_len(attr) - (end - start);
  90 }
  91
  92 static inline int blobmsg_len(const struct blob_attr *attr)
  93 {
  94         return blobmsg_data_len(attr);
  95 }
  96
  97 bool blobmsg_check_attr(const struct blob_attr *attr, bool name);
  98 bool blobmsg_check_attr_list(const struct blob_attr *attr, int type);
  99
 100 /*
 101  * blobmsg_check_array: validate array/table and return size
 102  *
 103  * Checks if all elements of an array or table are valid and have
 104  * the specified type. Returns the number of elements in the array
 105  */
 106 int blobmsg_check_array(const struct blob_attr *attr, int type);
 107
 108 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len,
 109                   struct blob_attr **tb, void *data, unsigned int len);
 110 int blobmsg_parse_array(const struct blobmsg_policy *policy, int policy_len,
 111                         struct blob_attr **tb, void *data, unsigned int len);
 112
 113 int blobmsg_add_field(struct blob_buf *buf, int type, const char *name,
 114                       const void *data, unsigned int len);
 115
 116 static inline int
 117 blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val)
 118 {
 119         return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1);
 120 }
 121
 122 static inline int
 123 blobmsg_add_u16(struct blob_buf *buf, const char *name, uint16_t val)
 124 {
 125         val = cpu_to_be16(val);
 126         return blobmsg_add_field(buf, BLOBMSG_TYPE_INT16, name, &val, 2);
 127 }
 128
 129 static inline int
 130 blobmsg_add_u32(struct blob_buf *buf, const char *name, uint32_t val)
 131 {
 132         val = cpu_to_be32(val);
 133         return blobmsg_add_field(buf, BLOBMSG_TYPE_INT32, name, &val, 4);
 134 }
 135
 136 static inline int
 137 blobmsg_add_u64(struct blob_buf *buf, const char *name, uint64_t val)
 138 {
 139         val = cpu_to_be64(val);
 140         return blobmsg_add_field(buf, BLOBMSG_TYPE_INT64, name, &val, 8);
 141 }
 142
 143 static inline int
 144 blobmsg_add_string(struct blob_buf *buf, const char *name, const char *string)
 145 {
 146         return blobmsg_add_field(buf, BLOBMSG_TYPE_STRING, name, string, strlen(string) + 1);
 147 }
 148
 149 static inline int
 150 blobmsg_add_blob(struct blob_buf *buf, struct blob_attr *attr)
 151 {
 152         return blobmsg_add_field(buf, blobmsg_type(attr), blobmsg_name(attr),
 153                                  blobmsg_data(attr), blobmsg_data_len(attr));
 154 }
 155
 156 void *blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array);
 157
 158 static inline void *
 159 blobmsg_open_array(struct blob_buf *buf, const char *name)
 160 {
 161         return blobmsg_open_nested(buf, name, true);
 162 }
 163
 164 static inline void *
 165 blobmsg_open_table(struct blob_buf *buf, const char *name)
 166 {
 167         return blobmsg_open_nested(buf, name, false);
 168 }
 169
 170 static inline void
 171 blobmsg_close_array(struct blob_buf *buf, void *cookie)
 172 {
 173         blob_nest_end(buf, cookie);
 174 }
 175
 176 static inline void
 177 blobmsg_close_table(struct blob_buf *buf, void *cookie)
 178 {
 179         blob_nest_end(buf, cookie);
 180 }
 181
 182 static inline int blobmsg_buf_init(struct blob_buf *buf)
 183 {
 184         return blob_buf_init(buf, BLOBMSG_TYPE_TABLE);
 185 }
 186
 187 static inline uint8_t blobmsg_get_u8(struct blob_attr *attr)
 188 {
 189         return *(uint8_t *) blobmsg_data(attr);
 190 }
 191
 192 static inline bool blobmsg_get_bool(struct blob_attr *attr)
 193 {
 194         return *(uint8_t *) blobmsg_data(attr);
 195 }
 196
 197 static inline uint16_t blobmsg_get_u16(struct blob_attr *attr)
 198 {
 199         return be16_to_cpu(*(uint16_t *) blobmsg_data(attr));
 200 }
 201
 202 static inline uint32_t blobmsg_get_u32(struct blob_attr *attr)
 203 {
 204         return be32_to_cpu(*(uint32_t *) blobmsg_data(attr));
 205 }
 206
 207 static inline uint64_t blobmsg_get_u64(struct blob_attr *attr)
 208 {
 209         uint32_t *ptr = (uint32_t *) blobmsg_data(attr);
 210         uint64_t tmp = ((uint64_t) be32_to_cpu(ptr[0])) << 32;
 211         tmp |= be32_to_cpu(ptr[1]);
 212         return tmp;
 213 }
 214
 215 static inline char *blobmsg_get_string(struct blob_attr *attr)
 216 {
 217         if (!attr)
 218                 return NULL;
 219
 220         return (char *) blobmsg_data(attr);
 221 }
 222
 223 void *blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, unsigned int maxlen);
 224 void *blobmsg_realloc_string_buffer(struct blob_buf *buf, unsigned int maxlen);
 225 void blobmsg_add_string_buffer(struct blob_buf *buf);
 226
 227 void blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg);
 228 void blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...)
 229      __attribute__((format(printf, 3, 4)));
 230
 231
 232 /* blobmsg to json formatting */
 233
 234 #define blobmsg_for_each_attr(pos, attr, rem) \
 235         for (rem = attr ? blobmsg_data_len(attr) : 0, \
 236              pos = attr ? blobmsg_data(attr) : 0; \
 237              rem > 0 && (blob_pad_len(pos) <= rem) && \
 238              (blob_pad_len(pos) >= sizeof(struct blob_attr)); \
 239              rem -= blob_pad_len(pos), pos = blob_next(pos))
 240
 241 #endif