Angel Pons | ebda03e | 2020-04-02 23:48:05 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Aaron Durbin | 88b26b8 | 2017-03-24 17:10:51 -0500 | [diff] [blame] | 2 | |
| 3 | #include <commonlib/endian.h> |
| 4 | #include <commonlib/iobuf.h> |
| 5 | #include <string.h> |
| 6 | |
| 7 | static int ibuf_check_size(const struct ibuf *ib, size_t sz) |
| 8 | { |
| 9 | if (ibuf_remaining(ib) < sz) |
| 10 | return -1; |
| 11 | |
| 12 | return 0; |
| 13 | } |
| 14 | |
| 15 | void ibuf_init(struct ibuf *ib, const void *b, size_t sz) |
| 16 | { |
| 17 | ib->b = b; |
| 18 | ib->n_read = 0; |
| 19 | ib->capacity = sz; |
| 20 | } |
| 21 | |
| 22 | void ibuf_from_obuf(struct ibuf *ib, const struct obuf *ob) |
| 23 | { |
| 24 | ibuf_init(ib, ob->b, ob->n_written); |
| 25 | } |
| 26 | |
| 27 | int ibuf_splice(const struct ibuf *src, struct ibuf *dst, size_t off, size_t sz) |
| 28 | { |
| 29 | size_t end = off + sz; |
| 30 | size_t capacity = ibuf_capacity(src); |
| 31 | size_t nr_read = ibuf_nr_read(src); |
| 32 | |
| 33 | if (end < off || end < sz || end > capacity) |
| 34 | return -1; |
| 35 | |
| 36 | ibuf_init(dst, &src->b[off], sz); |
| 37 | |
| 38 | /* Handle previously read data in src. */ |
| 39 | if (off < nr_read) |
| 40 | dst->n_read = nr_read - off; |
| 41 | |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | int ibuf_splice_current(const struct ibuf *src, struct ibuf *dst, size_t sz) |
| 46 | { |
| 47 | return ibuf_splice(src, dst, ibuf_nr_read(src), sz); |
| 48 | } |
| 49 | |
| 50 | int ibuf_split(const struct ibuf *src, struct ibuf *a, struct ibuf *b, |
| 51 | size_t boundary) |
| 52 | { |
| 53 | if (ibuf_splice(src, a, 0, boundary)) |
| 54 | return -1; |
| 55 | |
| 56 | return ibuf_splice(src, b, boundary, ibuf_capacity(src) - boundary); |
| 57 | } |
| 58 | |
| 59 | const void *ibuf_oob_drain(struct ibuf *ib, size_t sz) |
| 60 | { |
| 61 | const void *b; |
| 62 | |
| 63 | if (ibuf_check_size(ib, sz)) |
| 64 | return NULL; |
| 65 | |
| 66 | b = &ib->b[ib->n_read]; |
| 67 | ib->n_read += sz; |
| 68 | |
| 69 | return b; |
| 70 | } |
| 71 | |
| 72 | int ibuf_read(struct ibuf *ib, void *data, size_t sz) |
| 73 | { |
| 74 | const void *b = ibuf_oob_drain(ib, sz); |
| 75 | |
| 76 | if (b == NULL) |
| 77 | return -1; |
| 78 | |
| 79 | memcpy(data, b, sz); |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | int ibuf_read_be8(struct ibuf *ib, uint8_t *v) |
| 85 | { |
| 86 | size_t sz = sizeof(*v); |
| 87 | |
| 88 | if (ibuf_check_size(ib, sz)) |
| 89 | return -1; |
| 90 | |
| 91 | *v = read_at_be8(ib->b, ib->n_read); |
| 92 | ib->n_read += sz; |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | int ibuf_read_be16(struct ibuf *ib, uint16_t *v) |
| 98 | { |
| 99 | size_t sz = sizeof(*v); |
| 100 | |
| 101 | if (ibuf_check_size(ib, sz)) |
| 102 | return -1; |
| 103 | |
| 104 | *v = read_at_be16(ib->b, ib->n_read); |
| 105 | ib->n_read += sz; |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | int ibuf_read_be32(struct ibuf *ib, uint32_t *v) |
| 111 | { |
| 112 | size_t sz = sizeof(*v); |
| 113 | |
| 114 | if (ibuf_check_size(ib, sz)) |
| 115 | return -1; |
| 116 | |
| 117 | *v = read_at_be32(ib->b, ib->n_read); |
| 118 | ib->n_read += sz; |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | int ibuf_read_be64(struct ibuf *ib, uint64_t *v) |
| 124 | { |
| 125 | size_t sz = sizeof(*v); |
| 126 | |
| 127 | if (ibuf_check_size(ib, sz)) |
| 128 | return -1; |
| 129 | |
| 130 | *v = read_at_be64(ib->b, ib->n_read); |
| 131 | ib->n_read += sz; |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | int ibuf_read_le8(struct ibuf *ib, uint8_t *v) |
| 137 | { |
| 138 | size_t sz = sizeof(*v); |
| 139 | |
| 140 | if (ibuf_check_size(ib, sz)) |
| 141 | return -1; |
| 142 | |
| 143 | *v = read_at_le8(ib->b, ib->n_read); |
| 144 | ib->n_read += sz; |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | int ibuf_read_le16(struct ibuf *ib, uint16_t *v) |
| 150 | { |
| 151 | size_t sz = sizeof(*v); |
| 152 | |
| 153 | if (ibuf_check_size(ib, sz)) |
| 154 | return -1; |
| 155 | |
| 156 | *v = read_at_le16(ib->b, ib->n_read); |
| 157 | ib->n_read += sz; |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | int ibuf_read_le32(struct ibuf *ib, uint32_t *v) |
| 163 | { |
| 164 | size_t sz = sizeof(*v); |
| 165 | |
| 166 | if (ibuf_check_size(ib, sz)) |
| 167 | return -1; |
| 168 | |
| 169 | *v = read_at_le32(ib->b, ib->n_read); |
| 170 | ib->n_read += sz; |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | int ibuf_read_le64(struct ibuf *ib, uint64_t *v) |
| 176 | { |
| 177 | size_t sz = sizeof(*v); |
| 178 | |
| 179 | if (ibuf_check_size(ib, sz)) |
| 180 | return -1; |
| 181 | |
| 182 | *v = read_at_le64(ib->b, ib->n_read); |
| 183 | ib->n_read += sz; |
| 184 | |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | int ibuf_read_n8(struct ibuf *ib, uint8_t *v) |
| 189 | { |
| 190 | return ibuf_read(ib, v, sizeof(*v)); |
| 191 | } |
| 192 | |
| 193 | int ibuf_read_n16(struct ibuf *ib, uint16_t *v) |
| 194 | { |
| 195 | return ibuf_read(ib, v, sizeof(*v)); |
| 196 | } |
| 197 | |
| 198 | int ibuf_read_n32(struct ibuf *ib, uint32_t *v) |
| 199 | { |
| 200 | return ibuf_read(ib, v, sizeof(*v)); |
| 201 | } |
| 202 | |
| 203 | int ibuf_read_n64(struct ibuf *ib, uint64_t *v) |
| 204 | { |
| 205 | return ibuf_read(ib, v, sizeof(*v)); |
| 206 | } |
| 207 | |
| 208 | static int obuf_check_size(const struct obuf *ob, size_t sz) |
| 209 | { |
| 210 | if (obuf_remaining(ob) < sz) |
| 211 | return -1; |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | void obuf_init(struct obuf *ob, void *b, size_t sz) |
| 217 | { |
| 218 | ob->b = b; |
| 219 | ob->n_written = 0; |
| 220 | ob->capacity = sz; |
| 221 | } |
| 222 | |
| 223 | int obuf_splice(const struct obuf *src, struct obuf *dst, size_t off, size_t sz) |
| 224 | { |
| 225 | size_t end = off + sz; |
| 226 | size_t capacity = obuf_capacity(src); |
| 227 | size_t nr_written = obuf_nr_written(src); |
| 228 | |
| 229 | if (end < off || end < sz || end > capacity) |
| 230 | return -1; |
| 231 | |
| 232 | obuf_init(dst, &src->b[off], sz); |
| 233 | |
| 234 | /* Handle previously written data in src. */ |
| 235 | if (off < nr_written) |
| 236 | dst->n_written = nr_written - off; |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | int obuf_splice_current(const struct obuf *src, struct obuf *dst, size_t sz) |
| 242 | { |
| 243 | return obuf_splice(src, dst, obuf_nr_written(src), sz); |
| 244 | } |
| 245 | |
| 246 | int obuf_split(const struct obuf *src, struct obuf *a, struct obuf *b, |
| 247 | size_t boundary) |
| 248 | { |
| 249 | if (obuf_splice(src, a, 0, boundary)) |
| 250 | return -1; |
| 251 | |
| 252 | return obuf_splice(src, b, boundary, obuf_capacity(src) - boundary); |
| 253 | } |
| 254 | |
| 255 | void *obuf_oob_fill(struct obuf *ob, size_t sz) |
| 256 | { |
| 257 | void *b; |
| 258 | |
| 259 | if (obuf_check_size(ob, sz)) |
| 260 | return NULL; |
| 261 | |
| 262 | b = &ob->b[ob->n_written]; |
| 263 | ob->n_written += sz; |
| 264 | |
| 265 | return b; |
| 266 | } |
| 267 | |
| 268 | int obuf_write(struct obuf *ob, const void *data, size_t sz) |
| 269 | { |
| 270 | void *b; |
| 271 | |
| 272 | b = obuf_oob_fill(ob, sz); |
| 273 | if (b == NULL) |
| 274 | return -1; |
| 275 | |
| 276 | memcpy(b, data, sz); |
| 277 | |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | int obuf_write_be8(struct obuf *ob, uint8_t v) |
| 282 | { |
| 283 | size_t sz = sizeof(v); |
| 284 | |
| 285 | if (obuf_check_size(ob, sz)) |
| 286 | return -1; |
| 287 | |
| 288 | write_at_be8(ob->b, v, ob->n_written); |
| 289 | ob->n_written += sz; |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | int obuf_write_be16(struct obuf *ob, uint16_t v) |
| 295 | { |
| 296 | size_t sz = sizeof(v); |
| 297 | |
| 298 | if (obuf_check_size(ob, sz)) |
| 299 | return -1; |
| 300 | |
| 301 | write_at_be16(ob->b, v, ob->n_written); |
| 302 | ob->n_written += sz; |
| 303 | |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | int obuf_write_be32(struct obuf *ob, uint32_t v) |
| 308 | { |
| 309 | size_t sz = sizeof(v); |
| 310 | |
| 311 | if (obuf_check_size(ob, sz)) |
| 312 | return -1; |
| 313 | |
| 314 | write_at_be32(ob->b, v, ob->n_written); |
| 315 | ob->n_written += sz; |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | int obuf_write_be64(struct obuf *ob, uint64_t v) |
| 321 | { |
| 322 | size_t sz = sizeof(v); |
| 323 | |
| 324 | if (obuf_check_size(ob, sz)) |
| 325 | return -1; |
| 326 | |
| 327 | write_at_be64(ob->b, v, ob->n_written); |
| 328 | ob->n_written += sz; |
| 329 | |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | int obuf_write_le8(struct obuf *ob, uint8_t v) |
| 334 | { |
| 335 | size_t sz = sizeof(v); |
| 336 | |
| 337 | if (obuf_check_size(ob, sz)) |
| 338 | return -1; |
| 339 | |
| 340 | write_at_le8(ob->b, v, ob->n_written); |
| 341 | ob->n_written += sz; |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | int obuf_write_le16(struct obuf *ob, uint16_t v) |
| 347 | { |
| 348 | size_t sz = sizeof(v); |
| 349 | |
| 350 | if (obuf_check_size(ob, sz)) |
| 351 | return -1; |
| 352 | |
| 353 | write_at_le16(ob->b, v, ob->n_written); |
| 354 | ob->n_written += sz; |
| 355 | |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | int obuf_write_le32(struct obuf *ob, uint32_t v) |
| 360 | { |
| 361 | size_t sz = sizeof(v); |
| 362 | |
| 363 | if (obuf_check_size(ob, sz)) |
| 364 | return -1; |
| 365 | |
| 366 | write_at_le32(ob->b, v, ob->n_written); |
| 367 | ob->n_written += sz; |
| 368 | |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | int obuf_write_le64(struct obuf *ob, uint64_t v) |
| 373 | { |
| 374 | size_t sz = sizeof(v); |
| 375 | |
| 376 | if (obuf_check_size(ob, sz)) |
| 377 | return -1; |
| 378 | |
| 379 | write_at_le64(ob->b, v, ob->n_written); |
| 380 | ob->n_written += sz; |
| 381 | |
| 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | int obuf_write_n8(struct obuf *ob, uint8_t v) |
| 386 | { |
| 387 | return obuf_write(ob, &v, sizeof(v)); |
| 388 | } |
| 389 | |
| 390 | int obuf_write_n16(struct obuf *ob, uint16_t v) |
| 391 | { |
| 392 | return obuf_write(ob, &v, sizeof(v)); |
| 393 | } |
| 394 | |
| 395 | int obuf_write_n32(struct obuf *ob, uint32_t v) |
| 396 | { |
| 397 | return obuf_write(ob, &v, sizeof(v)); |
| 398 | } |
| 399 | |
| 400 | int obuf_write_n64(struct obuf *ob, uint64_t v) |
| 401 | { |
| 402 | return obuf_write(ob, &v, sizeof(v)); |
| 403 | } |
| 404 | |
| 405 | const void *obuf_contents(const struct obuf *ob, size_t *sz) |
| 406 | { |
| 407 | *sz = obuf_nr_written(ob); |
| 408 | return ob->b; |
| 409 | } |