Jeff Johnson | 295189b | 2012-06-20 16:38:30 -0700 | [diff] [blame] | 1 | /* |
Kiet Lam | 842dad0 | 2014-02-18 18:44:02 -0800 | [diff] [blame^] | 2 | * Copyright (c) 2012-2013 The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| 5 | * |
| 6 | * |
| 7 | * Permission to use, copy, modify, and/or distribute this software for |
| 8 | * any purpose with or without fee is hereby granted, provided that the |
| 9 | * above copyright notice and this permission notice appear in all |
| 10 | * copies. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| 13 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| 14 | * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| 15 | * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 16 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 17 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 18 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 19 | * PERFORMANCE OF THIS SOFTWARE. |
Gopichand Nakkala | 92f07d8 | 2013-01-08 21:16:34 -0800 | [diff] [blame] | 20 | */ |
Kiet Lam | 842dad0 | 2014-02-18 18:44:02 -0800 | [diff] [blame^] | 21 | |
Gopichand Nakkala | 92f07d8 | 2013-01-08 21:16:34 -0800 | [diff] [blame] | 22 | /* |
Kiet Lam | 842dad0 | 2014-02-18 18:44:02 -0800 | [diff] [blame^] | 23 | * This file was originally distributed by Qualcomm Atheros, Inc. |
| 24 | * under proprietary terms before Copyright ownership was assigned |
| 25 | * to the Linux Foundation. |
| 26 | */ |
| 27 | |
| 28 | /* |
Jeff Johnson | 295189b | 2012-06-20 16:38:30 -0700 | [diff] [blame] | 29 | * File: $File: //depot/software/projects/feature_branches/nova_phase1/ap/apps/include/aniAsfPacket.h $ |
| 30 | * Contains declarations for packet manipulation routines that make it |
| 31 | * easy to create and parse multi-layered network frames. This module |
| 32 | * minimizes buffer copies while adding or removing headers, and |
| 33 | * adding or removing payload. |
| 34 | * |
| 35 | * Author: Mayank D. Upadhyay |
| 36 | * Date: 19-June-2002 |
| 37 | * History:- |
| 38 | * Date Modified by Modification Information |
| 39 | * ------------------------------------------------------ |
| 40 | * |
| 41 | */ |
| 42 | #ifndef _ANI_ASF_PACKET_H_ |
| 43 | #define _ANI_ASF_PACKET_H_ |
| 44 | |
| 45 | #include "vos_types.h" |
| 46 | #include "palTypes.h" |
| 47 | |
| 48 | #define ANI_ETH_FRAME_LEN 1516 |
| 49 | #define ANI_DEFAULT_PACKET_SIZE (ANI_ETH_FRAME_LEN*2) |
| 50 | |
| 51 | /** |
| 52 | * Opaque packet structure with internal storage for raw bytes. |
| 53 | * Conceptually, a tPacket is a pre-allocated buffer that contains |
| 54 | * data in the middle and free space on either side. The start of the |
| 55 | * data is called the head. Routines are provided to add data at the |
| 56 | * front or at the rear. The length of the packet is the total number |
| 57 | * of valid data bytes contained in it. The size of the packet is the |
| 58 | * total number of preallocated bytes. |
| 59 | */ |
| 60 | typedef struct tAniPacket tAniPacket; |
| 61 | |
| 62 | /** |
| 63 | * aniAsfPacketAllocate |
| 64 | * |
| 65 | * FUNCTION: |
| 66 | * Create a packet of size 2*ANI_DEFAULT_PACKET_SIZE and positions the |
| 67 | * head of the packet in the center. The allocated storage can be free |
| 68 | * with a call to aniAsfPacketFree. |
| 69 | * |
| 70 | * LOGIC: |
| 71 | * Allocates storage for tPacket and its internal raw data |
| 72 | * buffer. Positions the head and tail pointers in the middle of the |
| 73 | * raw data buffer. |
| 74 | * |
| 75 | * @param packetPtr pointer that will be set to newly allocated |
| 76 | * tPacket if the operation succeeds. |
| 77 | * |
| 78 | * @return ANI_OK if the operation succeeds; ANI_E_MALLOC_FAILED if |
| 79 | * memory could not be allocated. |
| 80 | * @see aniAsfPacketFree |
| 81 | */ |
| 82 | int |
| 83 | aniAsfPacketAllocate(tAniPacket **packetPtr); |
| 84 | |
| 85 | /** |
| 86 | * aniAsfPacketDuplicate |
| 87 | * |
| 88 | * Duplicates a given packet exactly. That is, the contents, the size |
| 89 | * of the packet, and the positions of the pointers are maintained in |
| 90 | * the new copy. |
| 91 | * |
| 92 | * @param newPacketPtr is set to a newly allocated packet that is a |
| 93 | * duplicate of oldPacket |
| 94 | * @param oldPacket the original packet that should be duplicated |
| 95 | * |
| 96 | * @return ANI_OK if the operation succeeds |
| 97 | */ |
| 98 | int |
| 99 | aniAsfPacketDuplicate(tAniPacket **newPacketPtr, tAniPacket *oldPacket); |
| 100 | |
| 101 | /** |
| 102 | * aniAsfPacketAllocateExplicit |
| 103 | * |
| 104 | * FUNCTION: |
| 105 | * Create a packet of the desired size and position the head of the |
| 106 | * packet at the desired offset in the internal raw data buffer. An |
| 107 | * application would normally set this offset to the expected length |
| 108 | * of the protocol header, then append the payload, and finally, |
| 109 | * prepend the header. The allocated storage can be free with a call |
| 110 | * to aniAsfPacketFree. |
| 111 | * |
| 112 | * LOGIC: |
| 113 | * Allocates storage for tPacket and its internal raw data |
| 114 | * buffer. Positions the head and tail pointers at the given offset in |
| 115 | * the internal raw data buffer. |
| 116 | * |
| 117 | * @param packetPtr pointer that will be set to newly allocated |
| 118 | * tPacket if the operation succeeds. |
| 119 | * @param size the size of the internal raw data buffer |
| 120 | * @param offset the offset in the internal raw data buffer where the |
| 121 | * head of the packet will be positioned initially |
| 122 | * |
| 123 | * @return ANI_OK if the operation succeeds; ANI_E_MALLOC_FAILED if |
| 124 | * memory could not be allocated. |
| 125 | * @see aniAsfPacketFree |
| 126 | */ |
| 127 | int |
| 128 | aniAsfPacketAllocateExplicit(tAniPacket **packetPtr, |
| 129 | v_U32_t size, |
| 130 | v_U32_t offset); |
| 131 | |
| 132 | /** |
| 133 | * aniAsfPacketFree |
| 134 | * |
| 135 | * FUNCTION: |
| 136 | * Free a previously allocated tPacket and its internal raw data |
| 137 | * buffer. |
| 138 | * |
| 139 | * @param packet the packet to free |
| 140 | * |
| 141 | * @return ANI_OK if the operation succeeds; ANI_E_NULL_VALUE if an |
| 142 | * unexpected NULL pointer is encountered |
| 143 | */ |
| 144 | int |
| 145 | aniAsfPacketFree(tAniPacket *packet); |
| 146 | |
| 147 | /** |
| 148 | * aniAsfPacket2Str |
| 149 | * |
| 150 | * FUNCTION: |
| 151 | * Returns a printable representation of the data contained in the |
| 152 | * packet. |
| 153 | * Note: This function returns a static buffer used by aniAsfHexStr. |
| 154 | * |
| 155 | * @param packet the packet whose contents need to be printed |
| 156 | */ |
| 157 | v_U8_t *aniAsfPacket2Str(tAniPacket *packet); |
| 158 | |
| 159 | /** |
| 160 | * aniAsfPacketAppendBuffer |
| 161 | * |
| 162 | * FUNCTION: |
| 163 | * Appends the data contained in buf to the end of the data in |
| 164 | * destPacket. The head of destPacket remains unchanged, while its |
| 165 | * length increases by len. |
| 166 | * |
| 167 | * If there isn't enough free space in destPacket for all len bytes |
| 168 | * then the routine fails and the length of destPacket remains |
| 169 | * unchanged. |
| 170 | * |
| 171 | * LOGIC: |
| 172 | * Check that there is enough free space in the packet to append the |
| 173 | * buffer. If not, bail. Otherwise, copy bytes from the buffer into |
| 174 | * the packet's internal raw data buffer and increase the value of its |
| 175 | * length to reflect this. |
| 176 | * |
| 177 | * @param packet the packet to append to |
| 178 | * @param buf the buffer containing data to be appended to the packet |
| 179 | * @param len the number of bytes to append |
| 180 | * |
| 181 | * @return ANI_OK if the operation succeeds; ANI_E_FAILED if the |
| 182 | * packet does not have enough free space for the complete buffer |
| 183 | * @see aniAsfPacketPrependBuffer |
| 184 | */ |
| 185 | int |
| 186 | aniAsfPacketAppendBuffer(tAniPacket *destPacket, |
| 187 | const v_U8_t *buf, |
| 188 | v_U32_t len); |
| 189 | |
| 190 | /** |
| 191 | * aniAsfPacketPrependBuffer |
| 192 | * |
| 193 | * FUNCTION: |
| 194 | * Prepends the data contained in buf to the start of the data in |
| 195 | * destPacket. The head of destPacket is repositioned and the length |
| 196 | * of destPacket increases by len. |
| 197 | * |
| 198 | * If there isn't enough free space in destPacket for all len bytes |
| 199 | * then the routine fails and the length of destPacket remains |
| 200 | * unchanged. |
| 201 | * |
| 202 | * LOGIC: |
| 203 | * Check that there is enough free space in the packet to prepend the |
| 204 | * buffer. If not, bail. Otherwise, copy bytes from the buffer into |
| 205 | * the packet's internal raw data buffer and increase the value of its |
| 206 | * length to reflect this. |
| 207 | * |
| 208 | * @param packet the packet to prepend to |
| 209 | * @param buf the buffer containing data to be prepended to the packet |
| 210 | * @param len the number of bytes to prepend |
| 211 | * |
| 212 | * @return ANI_OK if the operation succeeds; ANI_E_FAILED if the |
| 213 | * packet does not have enough free space for the complete buffer |
| 214 | * @see aniAsfPacketAppendBuffer |
| 215 | */ |
| 216 | int |
| 217 | aniAsfPacketPrependBuffer(tAniPacket *destPacket, |
| 218 | const v_U8_t *buf, |
| 219 | v_U32_t len); |
| 220 | |
| 221 | /** |
| 222 | * aniAsfPacketCanAppendBuffer |
| 223 | * |
| 224 | * FUNCTION: |
| 225 | * Determines if len bytes can be safely appended to destPacket |
| 226 | * without overflowing. |
| 227 | * |
| 228 | * LOGIC: |
| 229 | * Current packet tail plus len of buffer should not exceed packet |
| 230 | * start plus packet size |
| 231 | * |
| 232 | * Note: This does not return a boolean value, but instead an integer |
| 233 | * code. |
| 234 | * |
| 235 | * @param packet the packet to append to |
| 236 | * @param len the number of bytes to append |
| 237 | * |
| 238 | * @return ANI_OK if the append operation would succeed; ANI_E_FAILED |
| 239 | * otherwise |
| 240 | */ |
| 241 | int |
| 242 | aniAsfPacketCanAppendBuffer(tAniPacket *destPacket, |
| 243 | v_U32_t len); |
| 244 | |
| 245 | /** |
| 246 | * aniAsfPacketCanPrependBuffer |
| 247 | * |
| 248 | * FUNCTION: |
| 249 | * Determines if len bytes can be safely prepended to destPacket |
| 250 | * without overflowing. |
| 251 | * |
| 252 | * LOGIC: |
| 253 | * Current packet head minus len of buffer should not be less than |
| 254 | * start of packet. |
| 255 | * |
| 256 | * Note: This does not return a boolean value, but instead an integer |
| 257 | * code. |
| 258 | * |
| 259 | * @param packet the packet to prepend to |
| 260 | * @param len the number of bytes to prepend |
| 261 | * |
| 262 | * @return ANI_OK if the append operation would succeed; ANI_E_FAILED |
| 263 | * otherwise |
| 264 | */ |
| 265 | int |
| 266 | aniAsfPacketCanPrependBuffer(tAniPacket *destPacket, |
| 267 | v_U32_t len); |
| 268 | |
| 269 | /** |
| 270 | * aniAsfPacketTruncateFromFront |
| 271 | * |
| 272 | * FUNCTION: |
| 273 | * Removes len bytes from the front of the packet by moving its |
| 274 | * head. The length of the packet is decremented by len. |
| 275 | * |
| 276 | * @param packet the packet to truncate from the front |
| 277 | * @param len the number of bytes to truncate |
| 278 | * |
| 279 | * @return ANI_OK if the append operation would succeed; ANI_E_FAILED |
| 280 | * otherwise |
| 281 | */ |
| 282 | int |
| 283 | aniAsfPacketTruncateFromFront(tAniPacket *packet, |
| 284 | v_U32_t len); |
| 285 | |
| 286 | /** |
| 287 | * aniAsfPacketTruncateFromRear |
| 288 | * |
| 289 | * FUNCTION: |
| 290 | * Removes len bytes from the rear of the packet by moving its |
| 291 | * tail. The length of the packet is decremented by len. |
| 292 | * |
| 293 | * @param packet the packet to truncate from the rear |
| 294 | * @param len the number of bytes to truncate |
| 295 | * |
| 296 | * @return ANI_OK if the append operation would succeed; ANI_E_FAILED |
| 297 | * otherwise |
| 298 | */ |
| 299 | int |
| 300 | aniAsfPacketTruncateFromRear(tAniPacket *packet, |
| 301 | v_U32_t len); |
| 302 | |
| 303 | /** |
| 304 | * aniAsfPacketGetLen |
| 305 | * |
| 306 | * FUNCTION: |
| 307 | * Returns the number of valid data bytes stored in the packet. |
| 308 | * |
| 309 | * @param packet the packet whose len we need |
| 310 | * |
| 311 | * @return the non-negative number of bytes stored in the packet |
| 312 | */ |
| 313 | int |
| 314 | aniAsfPacketGetLen(tAniPacket *packet); |
| 315 | |
| 316 | /** |
| 317 | * aniAsfPacketGetBytes |
| 318 | * |
| 319 | * FUNCTION: |
| 320 | * Returns a pointer to the head of the valid data stored in the |
| 321 | * packet. |
| 322 | * |
| 323 | * @param packet the packet whose bytes we need |
| 324 | * @param rawBytesPtr the pointer that will be set the start of the |
| 325 | * raw bytes. |
| 326 | * |
| 327 | * @return The non-negative number of bytes stored in the packet if |
| 328 | * the operation succeeded. That is the same value as what would be |
| 329 | * returned by aniAsfPacketGetLen. |
| 330 | */ |
| 331 | int |
| 332 | aniAsfPacketGetBytes(tAniPacket *packet, v_U8_t **rawBytesPtr); |
| 333 | |
| 334 | /** |
| 335 | * aniAsfPacketGetN |
| 336 | * |
| 337 | * Returns N bytes from the packet and moves the head of the packet |
| 338 | * beyond those bytes. |
| 339 | * |
| 340 | * @param packet the packet to read from |
| 341 | * @param n the number of bytes to read |
| 342 | * @param bytesPtr is set to the start of the octets |
| 343 | * |
| 344 | * @return ANI_OK if the operation succeeds; ANI_E_SHORT_PACKET if the |
| 345 | * packet does not have n bytes. |
| 346 | */ |
| 347 | int |
| 348 | aniAsfPacketGetN(tAniPacket *packet, int n, v_U8_t **bytesPtr); |
| 349 | |
| 350 | /** |
| 351 | * aniAsfPacketEmpty |
| 352 | * |
| 353 | * FUNCTION: |
| 354 | * Re-initializes the packet by positioning the head to the middle and |
| 355 | * setting the length to zero. |
| 356 | * |
| 357 | * @param packet the packet to empty |
| 358 | * |
| 359 | * @return ANI_OK if the operation succeeded |
| 360 | */ |
| 361 | int |
| 362 | aniAsfPacketEmpty(tAniPacket *packet); |
| 363 | |
| 364 | /** |
| 365 | * aniAsfPacketEmptyExplicit |
| 366 | * |
| 367 | * FUNCTION: |
| 368 | * Re-initializes the packet by positioning the head to the desired |
| 369 | * offset and setting the length to zero. |
| 370 | * |
| 371 | * @param packet the packet to empty |
| 372 | * @param offset the offset that the head of the packet should be set |
| 373 | * to. An application will be able to prepend and append data relative |
| 374 | * to this offset. |
| 375 | * |
| 376 | * @return ANI_OK if the operation succeeded |
| 377 | */ |
| 378 | int |
| 379 | aniAsfPacketEmptyExplicit(tAniPacket *packet, |
| 380 | v_U32_t offset); |
| 381 | |
| 382 | |
| 383 | /** |
| 384 | * aniAsfPacketPrependHdr |
| 385 | * |
| 386 | * FUNCTION: |
| 387 | * Prepends a tAniHdr at the start of the packet. All host to network |
| 388 | * byte order translation is also taken care of. |
| 389 | * |
| 390 | * @param packet the packet to write to |
| 391 | * @param msgType the message type to write as part of the header |
| 392 | * |
| 393 | * @return ANI_OK if the operation succeeds |
| 394 | */ |
| 395 | int |
| 396 | aniAsfPacketPrependHdr(tAniPacket *packet, v_U16_t msgType); |
| 397 | |
| 398 | /** |
| 399 | * aniAsfPacketGet32 |
| 400 | * |
| 401 | * FUNCTION: |
| 402 | * Reads a ANI_U32 out of the packet and returns it. The packet's head |
| 403 | * is advanced and its length decremented by the appropriate length. |
| 404 | * All network to host byte order translation is also taken care of. |
| 405 | * |
| 406 | * @param packet the packet to read from |
| 407 | * @param val the value to fill in |
| 408 | * |
| 409 | * @return ANI_OK if the operation succeeds |
| 410 | */ |
| 411 | int |
| 412 | aniAsfPacketGet32(tAniPacket *packet, v_U32_t *val); |
| 413 | |
| 414 | /** |
| 415 | * aniAsfPacketAppend32 |
| 416 | * |
| 417 | * FUNCTION: |
| 418 | * Appends a ANI_U32 to the end of the packet. |
| 419 | * All host to network byte order translation is also taken care of. |
| 420 | * |
| 421 | * @param packet the packet to write to |
| 422 | * @param val the value to append |
| 423 | * |
| 424 | * @return ANI_OK if the operation succeeds |
| 425 | */ |
| 426 | int |
| 427 | aniAsfPacketAppend32(tAniPacket *packet, v_U32_t val); |
| 428 | |
| 429 | /** |
| 430 | * aniAsfPacketGet16 |
| 431 | * |
| 432 | * FUNCTION: |
| 433 | * Reads a ANI_U16 out of the packet and returns it. The packet's head |
| 434 | * is advanced and its length decremented by the appropriate length. |
| 435 | * All network to host byte order translation is also taken care of. |
| 436 | * |
| 437 | * @param packet the packet to read from |
| 438 | * @param val the value to fill in |
| 439 | * |
| 440 | * @return ANI_OK if the operation succeeds |
| 441 | */ |
| 442 | int |
| 443 | aniAsfPacketGet16(tAniPacket *packet, v_U16_t *val); |
| 444 | |
| 445 | /** |
| 446 | * aniAsfPacketPrepend16 |
| 447 | * |
| 448 | * FUNCTION: |
| 449 | * Prepends a ANI_U16 to the start of the packet. |
| 450 | * All host to network byte order translation is also taken care of. |
| 451 | * |
| 452 | * @param packet the packet to write to |
| 453 | * @param val the value to prepend |
| 454 | * |
| 455 | * @return ANI_OK if the operation succeeds |
| 456 | */ |
| 457 | int |
| 458 | aniAsfPacketPrepend16(tAniPacket *packet, v_U16_t val); |
| 459 | |
| 460 | /** |
| 461 | * aniAsfPacketAppend16 |
| 462 | * |
| 463 | * FUNCTION: |
| 464 | * Appends a ANI_U16 to the end of the packet. |
| 465 | * All host to network byte order translation is also taken care of. |
| 466 | * |
| 467 | * @param packet the packet to write to |
| 468 | * @param val the value to append |
| 469 | * |
| 470 | * @return ANI_OK if the operation succeeds |
| 471 | */ |
| 472 | int |
| 473 | aniAsfPacketAppend16(tAniPacket *packet, v_U16_t val); |
| 474 | |
| 475 | /** |
| 476 | * aniAsfPacketGet8 |
| 477 | * |
| 478 | * FUNCTION: |
| 479 | * Reads a ANI_U8 out of the packet and returns it. The packet's head |
| 480 | * is advanced and its length decremented by the appropriate length. |
| 481 | * All network to host byte order translation is also taken care of. |
| 482 | * |
| 483 | * @param packet the packet to read from |
| 484 | * @param val the value to fill in |
| 485 | * |
| 486 | * @return ANI_OK if the operation succeeds |
| 487 | */ |
| 488 | int |
| 489 | aniAsfPacketGet8(tAniPacket *packet, v_U8_t *val); |
| 490 | |
| 491 | /** |
| 492 | * aniAsfPacketPrepend8 |
| 493 | * |
| 494 | * FUNCTION: |
| 495 | * Prepends a ANI_U8 to the start of the packet. |
| 496 | * All host to network byte order translation is also taken care of. |
| 497 | * |
| 498 | * @param packet the packet to read from |
| 499 | * @param val the value to prepend |
| 500 | * |
| 501 | * @return ANI_OK if the operation succeeds |
| 502 | */ |
| 503 | int |
| 504 | aniAsfPacketPrepend8(tAniPacket *packet, v_U8_t val); |
| 505 | |
| 506 | /** |
| 507 | * aniAsfPacketAppend8 |
| 508 | * |
| 509 | * FUNCTION: |
| 510 | * Appends a ANI_U8 to the end of the packet. |
| 511 | * All host to network byte order translation is also taken care of. |
| 512 | * |
| 513 | * @param packet the packet to write to |
| 514 | * @param val the value to append |
| 515 | * |
| 516 | * @return ANI_OK if the operation succeeds |
| 517 | */ |
| 518 | int |
| 519 | aniAsfPacketAppend8(tAniPacket *packet, v_U8_t val); |
| 520 | |
| 521 | /** |
| 522 | * aniAsfPacketGetMac |
| 523 | * |
| 524 | * FUNCTION: |
| 525 | * Returns a tAniMacAddr from the start of the packet. |
| 526 | * |
| 527 | * @param packet the packet to read from |
| 528 | * @param macAddr the destination to copy the MAC address to |
| 529 | * |
| 530 | * @return ANI_OK if the operation succeeds. Also, the packet head |
| 531 | * pointer is advanced past the MAC address. |
| 532 | */ |
| 533 | int |
| 534 | aniAsfPacketGetMac(tAniPacket *packet, tAniMacAddr macAddr); |
| 535 | |
| 536 | /** |
| 537 | * aniAsfPacketMoveLeft |
| 538 | * |
| 539 | * FUNCTION: |
| 540 | * Pretends that a certain number of bytes have been prepended to the |
| 541 | * packet, without actually copying any bytes in. The packet head and |
| 542 | * length are appropriately changed. This function is useful while |
| 543 | * interfacing with other libraries that only support byte array |
| 544 | * manipulation. |
| 545 | * |
| 546 | * WARNING: |
| 547 | * Applications are discouraged from using this function |
| 548 | * because correct usage is a two-step process - one: copy some bytes |
| 549 | * to the packet's internal buffer, two: move head and length. This |
| 550 | * violates the encapsulation the packet library aims to provide. |
| 551 | * |
| 552 | * @param packet the packet whose head and length needs to be modified |
| 553 | * @param count the number of bytes to modify by |
| 554 | * |
| 555 | * @return ANI_OK if the operation succeeds |
| 556 | */ |
| 557 | int |
| 558 | aniAsfPacketMoveLeft(tAniPacket *packet, v_U32_t count); |
| 559 | |
| 560 | /** |
| 561 | * aniAsfPacketMoveRight |
| 562 | * |
| 563 | * FUNCTION: |
| 564 | * Pretends that a certain number of bytes have been appended to the |
| 565 | * packet, without actually copying any bytes in. The packet tail and |
| 566 | * length are appropriately changed. This function is useful while |
| 567 | * interfacing with other libraries that only support byte array |
| 568 | * manipulation. |
| 569 | * |
| 570 | * WARNING: |
| 571 | * Applications are discouraged from using this function |
| 572 | * because correct usage is a two-step process - one: copy some bytes |
| 573 | * to the packet's internal buffer, two: move tail and length. This |
| 574 | * violates the encapsulation the packet library aims to provide. |
| 575 | * |
| 576 | * @param packet the packet whose head and length needs to be modified |
| 577 | * @param count the number of bytes to modify by |
| 578 | * |
| 579 | * @return ANI_OK if the operation succeeds |
| 580 | */ |
| 581 | int |
| 582 | aniAsfPacketMoveRight(tAniPacket *packet, v_U32_t count); |
| 583 | |
| 584 | /** |
| 585 | * aniAsfPacketGetBytesFromTail |
| 586 | * |
| 587 | * FUNCTION: |
| 588 | * Returns a pointer to the tail of the valid data stored |
| 589 | * in the packet. |
| 590 | * |
| 591 | * WARNING: |
| 592 | * Applications are discouraged from using this function |
| 593 | * because correct usage is a three-step process - one: call this |
| 594 | * routine to obtain a pointer to the current tail of the packet. |
| 595 | * two: treat this returned pointer like a simple array and copy |
| 596 | * some bytes to the packet's internal buffer, and finally |
| 597 | * three: move tail and length. This violates the encapsulation |
| 598 | * the packet library aims to provide. |
| 599 | * |
| 600 | * @param packet the packet whose bytes we need |
| 601 | * @param rawBytesPtr the pointer that will be set the start of the |
| 602 | * raw bytes. |
| 603 | * |
| 604 | * @return The non-negative number of bytes stored in the packet if |
| 605 | * the operation succeeded. That is the same value as what would be |
| 606 | * returned by aniAsfPacketGetLen. |
| 607 | */ |
| 608 | int |
| 609 | aniAsfPacketGetBytesFromTail(tAniPacket *packet, v_U8_t **rawBytesPtr); |
| 610 | |
| 611 | |
| 612 | #endif // _ANI_ASF_PACKET_H_ |