1/****************************************************************************** 2 * 3 * Copyright (C) 2010-2012 Broadcom Corporation 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19/****************************************************************************** 20 * 21 * This file contains source code for some utility functions to help parse 22 * and build NFC Data Exchange Format (NDEF) messages 23 * 24 ******************************************************************************/ 25#include <string.h> 26#include "ndef_utils.h" 27 28/******************************************************************************* 29** 30** Static Local Functions 31** 32*******************************************************************************/ 33 34 35/******************************************************************************* 36** 37** Function shiftdown 38** 39** Description shift memory down (to make space to insert a record) 40** 41*******************************************************************************/ 42static void shiftdown (UINT8 *p_mem, UINT32 len, UINT32 shift_amount) 43{ 44 register UINT8 *ps = p_mem + len - 1; 45 register UINT8 *pd = ps + shift_amount; 46 register UINT32 xx; 47 48 for (xx = 0; xx < len; xx++) 49 *pd-- = *ps--; 50} 51 52/******************************************************************************* 53** 54** Function shiftup 55** 56** Description shift memory up (to delete a record) 57** 58*******************************************************************************/ 59static void shiftup (UINT8 *p_dest, UINT8 *p_src, UINT32 len) 60{ 61 register UINT8 *ps = p_src; 62 register UINT8 *pd = p_dest; 63 register UINT32 xx; 64 65 for (xx = 0; xx < len; xx++) 66 *pd++ = *ps++; 67} 68 69/******************************************************************************* 70** 71** Function NDEF_MsgValidate 72** 73** Description This function validates an NDEF message. 74** 75** Returns TRUE if all OK, or FALSE if the message is invalid. 76** 77*******************************************************************************/ 78tNDEF_STATUS NDEF_MsgValidate (UINT8 *p_msg, UINT32 msg_len, BOOLEAN b_allow_chunks) 79{ 80 UINT8 *p_rec = p_msg; 81 UINT8 *p_end = p_msg + msg_len; 82 UINT8 rec_hdr=0, type_len, id_len; 83 int count; 84 UINT32 payload_len; 85 BOOLEAN bInChunk = FALSE; 86 87 if ( (p_msg == NULL) || (msg_len < 3) ) 88 return (NDEF_MSG_TOO_SHORT); 89 90 /* The first record must have the MB bit set */ 91 if ((*p_msg & NDEF_MB_MASK) == 0) 92 return (NDEF_MSG_NO_MSG_BEGIN); 93 94 /* The first record cannot be a chunk */ 95 if ((*p_msg & NDEF_TNF_MASK) == NDEF_TNF_UNCHANGED) 96 return (NDEF_MSG_UNEXPECTED_CHUNK); 97 98 for (count = 0; p_rec < p_end; count++) 99 { 100 /* if less than short record header */ 101 if (p_rec + 3 > p_end) 102 return (NDEF_MSG_TOO_SHORT); 103 104 rec_hdr = *p_rec++; 105 106 /* The second and all subsequent records must NOT have the MB bit set */ 107 if ( (count > 0) && (rec_hdr & NDEF_MB_MASK) ) 108 return (NDEF_MSG_EXTRA_MSG_BEGIN); 109 110 /* Type field length */ 111 type_len = *p_rec++; 112 113 /* Payload length - can be 1 or 4 bytes */ 114 if (rec_hdr & NDEF_SR_MASK) 115 payload_len = *p_rec++; 116 else 117 { 118 /* if less than 4 bytes payload length */ 119 if (p_rec + 4 > p_end) 120 return (NDEF_MSG_TOO_SHORT); 121 122 BE_STREAM_TO_UINT32 (payload_len, p_rec); 123 } 124 125 /* ID field Length */ 126 if (rec_hdr & NDEF_IL_MASK) 127 { 128 /* if less than 1 byte ID field length */ 129 if (p_rec + 1 > p_end) 130 return (NDEF_MSG_TOO_SHORT); 131 132 id_len = *p_rec++; 133 } 134 else 135 id_len = 0; 136 137 /* A chunk must have type "unchanged", and no type or ID fields */ 138 if (rec_hdr & NDEF_CF_MASK) 139 { 140 if (!b_allow_chunks) 141 return (NDEF_MSG_UNEXPECTED_CHUNK); 142 143 /* Inside a chunk, the type must be unchanged and no type or ID field i sallowed */ 144 if (bInChunk) 145 { 146 if ( (type_len != 0) || (id_len != 0) || ((rec_hdr & NDEF_TNF_MASK) != NDEF_TNF_UNCHANGED) ) 147 return (NDEF_MSG_INVALID_CHUNK); 148 } 149 else 150 { 151 /* First record of a chunk must NOT have type "unchanged" */ 152 if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_UNCHANGED) 153 return (NDEF_MSG_INVALID_CHUNK); 154 155 bInChunk = TRUE; 156 } 157 } 158 else 159 { 160 /* This may be the last guy in a chunk. */ 161 if (bInChunk) 162 { 163 if ( (type_len != 0) || (id_len != 0) || ((rec_hdr & NDEF_TNF_MASK) != NDEF_TNF_UNCHANGED) ) 164 return (NDEF_MSG_INVALID_CHUNK); 165 166 bInChunk = FALSE; 167 } 168 else 169 { 170 /* If not in a chunk, the record must NOT have type "unchanged" */ 171 if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_UNCHANGED) 172 return (NDEF_MSG_INVALID_CHUNK); 173 } 174 } 175 176 /* An empty record must NOT have a type, ID or payload */ 177 if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_EMPTY) 178 { 179 if ( (type_len != 0) || (id_len != 0) || (payload_len != 0) ) 180 return (NDEF_MSG_INVALID_EMPTY_REC); 181 } 182 183 if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_UNKNOWN) 184 { 185 if (type_len != 0) 186 return (NDEF_MSG_LENGTH_MISMATCH); 187 } 188 189 /* Point to next record */ 190 p_rec += (payload_len + type_len + id_len); 191 192 if (rec_hdr & NDEF_ME_MASK) 193 break; 194 195 rec_hdr = 0; 196 } 197 198 /* The last record should have the ME bit set */ 199 if ((rec_hdr & NDEF_ME_MASK) == 0) 200 return (NDEF_MSG_NO_MSG_END); 201 202 /* p_rec should equal p_end if all the length fields were correct */ 203 if (p_rec != p_end) 204 return (NDEF_MSG_LENGTH_MISMATCH); 205 206 return (NDEF_OK); 207} 208 209/******************************************************************************* 210** 211** Function NDEF_MsgGetNumRecs 212** 213** Description This function gets the number of records in the given NDEF 214** message. 215** 216** Returns The record count, or 0 if the message is invalid. 217** 218*******************************************************************************/ 219INT32 NDEF_MsgGetNumRecs (UINT8 *p_msg) 220{ 221 UINT8 *p_rec = p_msg; 222 UINT8 rec_hdr, type_len, id_len; 223 int count; 224 UINT32 payload_len; 225 226 for (count = 0; ; ) 227 { 228 count++; 229 230 rec_hdr = *p_rec++; 231 232 if (rec_hdr & NDEF_ME_MASK) 233 break; 234 235 /* Type field length */ 236 type_len = *p_rec++; 237 238 /* Payload length - can be 1 or 4 bytes */ 239 if (rec_hdr & NDEF_SR_MASK) 240 payload_len = *p_rec++; 241 else 242 BE_STREAM_TO_UINT32 (payload_len, p_rec); 243 244 /* ID field Length */ 245 if (rec_hdr & NDEF_IL_MASK) 246 id_len = *p_rec++; 247 else 248 id_len = 0; 249 250 /* Point to next record */ 251 p_rec += (payload_len + type_len + id_len); 252 } 253 254 /* Return the number of records found */ 255 return (count); 256} 257 258/******************************************************************************* 259** 260** Function NDEF_MsgGetRecLength 261** 262** Description This function returns length of the current record in the given 263** NDEF message. 264** 265** Returns Length of record 266** 267*******************************************************************************/ 268UINT32 NDEF_MsgGetRecLength (UINT8 *p_cur_rec) 269{ 270 UINT8 rec_hdr, type_len, id_len; 271 UINT32 rec_len = 0; 272 UINT32 payload_len; 273 274 /* Get the current record's header */ 275 rec_hdr = *p_cur_rec++; 276 rec_len++; 277 278 /* Type field length */ 279 type_len = *p_cur_rec++; 280 rec_len++; 281 282 /* Payload length - can be 1 or 4 bytes */ 283 if (rec_hdr & NDEF_SR_MASK) 284 { 285 payload_len = *p_cur_rec++; 286 rec_len++; 287 } 288 else 289 { 290 BE_STREAM_TO_UINT32 (payload_len, p_cur_rec); 291 rec_len += 4; 292 } 293 294 /* ID field Length */ 295 if (rec_hdr & NDEF_IL_MASK) 296 { 297 id_len = *p_cur_rec++; 298 rec_len++; 299 } 300 else 301 id_len = 0; 302 303 /* Total length of record */ 304 rec_len += (payload_len + type_len + id_len); 305 306 return (rec_len); 307} 308 309/******************************************************************************* 310** 311** Function NDEF_MsgGetNextRec 312** 313** Description This function gets a pointer to the next record in the given 314** NDEF message. If the current record pointer is NULL, a pointer 315** to the first record is returned. 316** 317** Returns Pointer to the start of the record, or NULL if no more 318** 319*******************************************************************************/ 320UINT8 *NDEF_MsgGetNextRec (UINT8 *p_cur_rec) 321{ 322 UINT8 rec_hdr, type_len, id_len; 323 UINT32 payload_len; 324 325 /* Get the current record's header */ 326 rec_hdr = *p_cur_rec++; 327 328 /* If this is the last record, return NULL */ 329 if (rec_hdr & NDEF_ME_MASK) 330 return (NULL); 331 332 /* Type field length */ 333 type_len = *p_cur_rec++; 334 335 /* Payload length - can be 1 or 4 bytes */ 336 if (rec_hdr & NDEF_SR_MASK) 337 payload_len = *p_cur_rec++; 338 else 339 BE_STREAM_TO_UINT32 (payload_len, p_cur_rec); 340 341 /* ID field Length */ 342 if (rec_hdr & NDEF_IL_MASK) 343 id_len = *p_cur_rec++; 344 else 345 id_len = 0; 346 347 /* Point to next record */ 348 p_cur_rec += (payload_len + type_len + id_len); 349 350 return (p_cur_rec); 351} 352 353/******************************************************************************* 354** 355** Function NDEF_MsgGetRecByIndex 356** 357** Description This function gets a pointer to the record with the given 358** index (0-based index) in the given NDEF message. 359** 360** Returns Pointer to the start of the record, or NULL 361** 362*******************************************************************************/ 363UINT8 *NDEF_MsgGetRecByIndex (UINT8 *p_msg, INT32 index) 364{ 365 UINT8 *p_rec = p_msg; 366 UINT8 rec_hdr, type_len, id_len; 367 INT32 count; 368 UINT32 payload_len; 369 370 for (count = 0; ; count++) 371 { 372 if (count == index) 373 return (p_rec); 374 375 rec_hdr = *p_rec++; 376 377 if (rec_hdr & NDEF_ME_MASK) 378 return (NULL); 379 380 /* Type field length */ 381 type_len = *p_rec++; 382 383 /* Payload length - can be 1 or 4 bytes */ 384 if (rec_hdr & NDEF_SR_MASK) 385 payload_len = *p_rec++; 386 else 387 BE_STREAM_TO_UINT32 (payload_len, p_rec); 388 389 /* ID field Length */ 390 if (rec_hdr & NDEF_IL_MASK) 391 id_len = *p_rec++; 392 else 393 id_len = 0; 394 395 /* Point to next record */ 396 p_rec += (payload_len + type_len + id_len); 397 } 398 399 /* If here, there is no record of that index */ 400 return (NULL); 401} 402 403 404/******************************************************************************* 405** 406** Function NDEF_MsgGetLastRecInMsg 407** 408** Description This function gets a pointer to the last record in the 409** given NDEF message. 410** 411** Returns Pointer to the start of the last record, or NULL if some problem 412** 413*******************************************************************************/ 414UINT8 *NDEF_MsgGetLastRecInMsg (UINT8 *p_msg) 415{ 416 UINT8 *p_rec = p_msg; 417 UINT8 *pRecStart; 418 UINT8 rec_hdr, type_len, id_len; 419 UINT32 payload_len; 420 421 for ( ; ; ) 422 { 423 pRecStart = p_rec; 424 rec_hdr = *p_rec++; 425 426 if (rec_hdr & NDEF_ME_MASK) 427 break; 428 429 /* Type field length */ 430 type_len = *p_rec++; 431 432 /* Payload length - can be 1 or 4 bytes */ 433 if (rec_hdr & NDEF_SR_MASK) 434 payload_len = *p_rec++; 435 else 436 BE_STREAM_TO_UINT32 (payload_len, p_rec); 437 438 /* ID field Length */ 439 if (rec_hdr & NDEF_IL_MASK) 440 id_len = *p_rec++; 441 else 442 id_len = 0; 443 444 /* Point to next record */ 445 p_rec += (payload_len + type_len + id_len); 446 } 447 448 return (pRecStart); 449} 450 451 452/******************************************************************************* 453** 454** Function NDEF_MsgGetFirstRecByType 455** 456** Description This function gets a pointer to the first record with the given 457** record type in the given NDEF message. 458** 459** Returns Pointer to the start of the record, or NULL 460** 461*******************************************************************************/ 462UINT8 *NDEF_MsgGetFirstRecByType (UINT8 *p_msg, UINT8 tnf, UINT8 *p_type, UINT8 tlen) 463{ 464 UINT8 *p_rec = p_msg; 465 UINT8 *pRecStart; 466 UINT8 rec_hdr, type_len, id_len; 467 UINT32 payload_len; 468 469 for ( ; ; ) 470 { 471 pRecStart = p_rec; 472 473 rec_hdr = *p_rec++; 474 475 /* Type field length */ 476 type_len = *p_rec++; 477 478 /* Payload length - can be 1 or 4 bytes */ 479 if (rec_hdr & NDEF_SR_MASK) 480 payload_len = *p_rec++; 481 else 482 BE_STREAM_TO_UINT32 (payload_len, p_rec); 483 484 /* ID field Length */ 485 if (rec_hdr & NDEF_IL_MASK) 486 id_len = *p_rec++; 487 else 488 id_len = 0; 489 490 /* At this point, p_rec points to the start of the type field. We need to */ 491 /* compare the type of the type, the length of the type and the data */ 492 if ( ((rec_hdr & NDEF_TNF_MASK) == tnf) 493 && (type_len == tlen) 494 && (!memcmp (p_rec, p_type, tlen)) ) 495 return (pRecStart); 496 497 /* If this was the last record, return NULL */ 498 if (rec_hdr & NDEF_ME_MASK) 499 return (NULL); 500 501 /* Point to next record */ 502 p_rec += (payload_len + type_len + id_len); 503 } 504 505 /* If here, there is no record of that type */ 506 return (NULL); 507} 508 509/******************************************************************************* 510** 511** Function NDEF_MsgGetNextRecByType 512** 513** Description This function gets a pointer to the next record with the given 514** record type in the given NDEF message. 515** 516** Returns Pointer to the start of the record, or NULL 517** 518*******************************************************************************/ 519UINT8 *NDEF_MsgGetNextRecByType (UINT8 *p_cur_rec, UINT8 tnf, UINT8 *p_type, UINT8 tlen) 520{ 521 UINT8 *p_rec; 522 UINT8 *pRecStart; 523 UINT8 rec_hdr, type_len, id_len; 524 UINT32 payload_len; 525 526 /* If this is the last record in the message, return NULL */ 527 if ((p_rec = NDEF_MsgGetNextRec (p_cur_rec)) == NULL) 528 return (NULL); 529 530 for ( ; ; ) 531 { 532 pRecStart = p_rec; 533 534 rec_hdr = *p_rec++; 535 536 /* Type field length */ 537 type_len = *p_rec++; 538 539 /* Payload length - can be 1 or 4 bytes */ 540 if (rec_hdr & NDEF_SR_MASK) 541 payload_len = *p_rec++; 542 else 543 BE_STREAM_TO_UINT32 (payload_len, p_rec); 544 545 /* ID field Length */ 546 if (rec_hdr & NDEF_IL_MASK) 547 id_len = *p_rec++; 548 else 549 id_len = 0; 550 551 /* At this point, p_rec points to the start of the type field. We need to */ 552 /* compare the type of the type, the length of the type and the data */ 553 if ( ((rec_hdr & NDEF_TNF_MASK) == tnf) 554 && (type_len == tlen) 555 && (!memcmp (p_rec, p_type, tlen)) ) 556 return (pRecStart); 557 558 /* If this was the last record, return NULL */ 559 if (rec_hdr & NDEF_ME_MASK) 560 break; 561 562 /* Point to next record */ 563 p_rec += (payload_len + type_len + id_len); 564 } 565 566 /* If here, there is no record of that type */ 567 return (NULL); 568} 569 570 571/******************************************************************************* 572** 573** Function NDEF_MsgGetFirstRecById 574** 575** Description This function gets a pointer to the first record with the given 576** record id in the given NDEF message. 577** 578** Returns Pointer to the start of the record, or NULL 579** 580*******************************************************************************/ 581UINT8 *NDEF_MsgGetFirstRecById (UINT8 *p_msg, UINT8 *p_id, UINT8 ilen) 582{ 583 UINT8 *p_rec = p_msg; 584 UINT8 *pRecStart; 585 UINT8 rec_hdr, type_len, id_len; 586 UINT32 payload_len; 587 588 for ( ; ; ) 589 { 590 pRecStart = p_rec; 591 592 rec_hdr = *p_rec++; 593 594 /* Type field length */ 595 type_len = *p_rec++; 596 597 /* Payload length - can be 1 or 4 bytes */ 598 if (rec_hdr & NDEF_SR_MASK) 599 payload_len = *p_rec++; 600 else 601 BE_STREAM_TO_UINT32 (payload_len, p_rec); 602 603 /* ID field Length */ 604 if (rec_hdr & NDEF_IL_MASK) 605 id_len = *p_rec++; 606 else 607 id_len = 0; 608 609 /* At this point, p_rec points to the start of the type field. Skip it */ 610 p_rec += type_len; 611 612 /* At this point, p_rec points to the start of the ID field. Compare length and data */ 613 if ( (id_len == ilen) && (!memcmp (p_rec, p_id, ilen)) ) 614 return (pRecStart); 615 616 /* If this was the last record, return NULL */ 617 if (rec_hdr & NDEF_ME_MASK) 618 return (NULL); 619 620 /* Point to next record */ 621 p_rec += (id_len + payload_len); 622 } 623 624 /* If here, there is no record of that ID */ 625 return (NULL); 626} 627 628/******************************************************************************* 629** 630** Function NDEF_MsgGetNextRecById 631** 632** Description This function gets a pointer to the next record with the given 633** record id in the given NDEF message. 634** 635** Returns Pointer to the start of the record, or NULL 636** 637*******************************************************************************/ 638UINT8 *NDEF_MsgGetNextRecById (UINT8 *p_cur_rec, UINT8 *p_id, UINT8 ilen) 639{ 640 UINT8 *p_rec; 641 UINT8 *pRecStart; 642 UINT8 rec_hdr, type_len, id_len; 643 UINT32 payload_len; 644 645 /* If this is the last record in the message, return NULL */ 646 if ((p_rec = NDEF_MsgGetNextRec (p_cur_rec)) == NULL) 647 return (NULL); 648 649 for ( ; ; ) 650 { 651 pRecStart = p_rec; 652 653 rec_hdr = *p_rec++; 654 655 /* Type field length */ 656 type_len = *p_rec++; 657 658 /* Payload length - can be 1 or 4 bytes */ 659 if (rec_hdr & NDEF_SR_MASK) 660 payload_len = *p_rec++; 661 else 662 BE_STREAM_TO_UINT32 (payload_len, p_rec); 663 664 /* ID field Length */ 665 if (rec_hdr & NDEF_IL_MASK) 666 id_len = *p_rec++; 667 else 668 id_len = 0; 669 670 /* At this point, p_rec points to the start of the type field. Skip it */ 671 p_rec += type_len; 672 673 /* At this point, p_rec points to the start of the ID field. Compare length and data */ 674 if ( (id_len == ilen) && (!memcmp (p_rec, p_id, ilen)) ) 675 return (pRecStart); 676 677 /* If this was the last record, return NULL */ 678 if (rec_hdr & NDEF_ME_MASK) 679 break; 680 681 /* Point to next record */ 682 p_rec += (id_len + payload_len); 683 } 684 685 /* If here, there is no record of that ID */ 686 return (NULL); 687} 688 689/******************************************************************************* 690** 691** Function NDEF_RecGetType 692** 693** Description This function gets a pointer to the record type for the given NDEF record. 694** 695** Returns Pointer to Type (NULL if none). TNF and len are filled in. 696** 697*******************************************************************************/ 698UINT8 *NDEF_RecGetType (UINT8 *p_rec, UINT8 *p_tnf, UINT8 *p_type_len) 699{ 700 UINT8 rec_hdr, type_len; 701 702 /* First byte is the record header */ 703 rec_hdr = *p_rec++; 704 705 /* Next byte is the type field length */ 706 type_len = *p_rec++; 707 708 /* Skip the payload length */ 709 if (rec_hdr & NDEF_SR_MASK) 710 p_rec += 1; 711 else 712 p_rec += 4; 713 714 /* Skip ID field Length, if present */ 715 if (rec_hdr & NDEF_IL_MASK) 716 p_rec++; 717 718 /* At this point, p_rec points to the start of the type field. */ 719 *p_type_len = type_len; 720 *p_tnf = rec_hdr & NDEF_TNF_MASK; 721 722 if (type_len == 0) 723 return (NULL); 724 else 725 return (p_rec); 726} 727 728/******************************************************************************* 729** 730** Function NDEF_RecGetId 731** 732** Description This function gets a pointer to the record id for the given NDEF record. 733** 734** Returns Pointer to Id (NULL if none). ID Len is filled in. 735** 736*******************************************************************************/ 737UINT8 *NDEF_RecGetId (UINT8 *p_rec, UINT8 *p_id_len) 738{ 739 UINT8 rec_hdr, type_len; 740 741 /* First byte is the record header */ 742 rec_hdr = *p_rec++; 743 744 /* Next byte is the type field length */ 745 type_len = *p_rec++; 746 747 /* Skip the payload length */ 748 if (rec_hdr & NDEF_SR_MASK) 749 p_rec++; 750 else 751 p_rec += 4; 752 753 /* ID field Length */ 754 if (rec_hdr & NDEF_IL_MASK) 755 *p_id_len = *p_rec++; 756 else 757 *p_id_len = 0; 758 759 /* p_rec now points to the start of the type field. The ID field follows it */ 760 if (*p_id_len == 0) 761 return (NULL); 762 else 763 return (p_rec + type_len); 764} 765 766 767/******************************************************************************* 768** 769** Function NDEF_RecGetPayload 770** 771** Description This function gets a pointer to the payload for the given NDEF record. 772** 773** Returns a pointer to the payload (or NULL none). Payload len filled in. 774** 775*******************************************************************************/ 776UINT8 *NDEF_RecGetPayload (UINT8 *p_rec, UINT32 *p_payload_len) 777{ 778 UINT8 rec_hdr, type_len, id_len; 779 UINT32 payload_len; 780 781 /* First byte is the record header */ 782 rec_hdr = *p_rec++; 783 784 /* Next byte is the type field length */ 785 type_len = *p_rec++; 786 787 /* Next is the payload length (1 or 4 bytes) */ 788 if (rec_hdr & NDEF_SR_MASK) 789 payload_len = *p_rec++; 790 else 791 BE_STREAM_TO_UINT32 (payload_len, p_rec); 792 793 *p_payload_len = payload_len; 794 795 /* ID field Length */ 796 if (rec_hdr & NDEF_IL_MASK) 797 id_len = *p_rec++; 798 else 799 id_len = 0; 800 801 /* p_rec now points to the start of the type field. The ID field follows it, then the payload */ 802 if (payload_len == 0) 803 return (NULL); 804 else 805 return (p_rec + type_len + id_len); 806} 807 808 809/******************************************************************************* 810** 811** Function NDEF_MsgInit 812** 813** Description This function initializes an NDEF message. 814** 815** Returns void 816** *p_cur_size is initialized to 0 817** 818*******************************************************************************/ 819void NDEF_MsgInit (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size) 820{ 821 *p_cur_size = 0; 822 memset (p_msg, 0, max_size); 823} 824 825/******************************************************************************* 826** 827** Function NDEF_MsgAddRec 828** 829** Description This function adds an NDEF record to the end of an NDEF message. 830** 831** Returns OK, or error if the record did not fit 832** *p_cur_size is updated 833** 834*******************************************************************************/ 835extern tNDEF_STATUS NDEF_MsgAddRec (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, 836 UINT8 tnf, UINT8 *p_type, UINT8 type_len, 837 UINT8 *p_id, UINT8 id_len, 838 UINT8 *p_payload, UINT32 payload_len) 839{ 840 UINT8 *p_rec = p_msg + *p_cur_size; 841 UINT32 recSize; 842 int plen = (payload_len < 256) ? 1 : 4; 843 int ilen = (id_len == 0) ? 0 : 1; 844 845 if (tnf > NDEF_TNF_RESERVED) 846 { 847 tnf = NDEF_TNF_UNKNOWN; 848 type_len = 0; 849 } 850 851 /* First, make sure the record will fit. we need at least 2 bytes for header and type length */ 852 recSize = payload_len + 2 + type_len + plen + ilen + id_len; 853 854 if ((*p_cur_size + recSize) > max_size) 855 return (NDEF_MSG_INSUFFICIENT_MEM); 856 857 /* Construct the record header. For the first record, set both begin and end bits */ 858 if (*p_cur_size == 0) 859 *p_rec = tnf | NDEF_MB_MASK | NDEF_ME_MASK; 860 else 861 { 862 /* Find the previous last and clear his 'Message End' bit */ 863 UINT8 *pLast = NDEF_MsgGetLastRecInMsg (p_msg); 864 865 if (!pLast) 866 return (FALSE); 867 868 *pLast &= ~NDEF_ME_MASK; 869 *p_rec = tnf | NDEF_ME_MASK; 870 } 871 872 if (plen == 1) 873 *p_rec |= NDEF_SR_MASK; 874 875 if (ilen != 0) 876 *p_rec |= NDEF_IL_MASK; 877 878 p_rec++; 879 880 /* The next byte is the type field length */ 881 *p_rec++ = type_len; 882 883 /* Payload length - can be 1 or 4 bytes */ 884 if (plen == 1) 885 *p_rec++ = (UINT8)payload_len; 886 else 887 UINT32_TO_BE_STREAM (p_rec, payload_len); 888 889 /* ID field Length (optional) */ 890 if (ilen > 0) 891 *p_rec++ = id_len; 892 893 /* Next comes the type */ 894 if (type_len) 895 { 896 if (p_type) 897 memcpy (p_rec, p_type, type_len); 898 899 p_rec += type_len; 900 } 901 902 /* Next comes the ID */ 903 if (id_len) 904 { 905 if (p_id) 906 memcpy (p_rec, p_id, id_len); 907 908 p_rec += id_len; 909 } 910 911 /* And lastly the payload. If NULL, the app just wants to reserve memory */ 912 if (p_payload) 913 memcpy (p_rec, p_payload, payload_len); 914 915 *p_cur_size += recSize; 916 917 return (NDEF_OK); 918} 919 920/******************************************************************************* 921** 922** Function NDEF_MsgInsertRec 923** 924** Description This function inserts a record at a specific index into the 925** given NDEF message 926** 927** Returns OK, or error if the record did not fit 928** *p_cur_size is updated 929** 930*******************************************************************************/ 931extern tNDEF_STATUS NDEF_MsgInsertRec (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, INT32 index, 932 UINT8 tnf, UINT8 *p_type, UINT8 type_len, 933 UINT8 *p_id, UINT8 id_len, 934 UINT8 *p_payload, UINT32 payload_len) 935{ 936 UINT8 *p_rec; 937 UINT32 recSize; 938 INT32 plen = (payload_len < 256) ? 1 : 4; 939 INT32 ilen = (id_len == 0) ? 0 : 1; 940 941 /* First, make sure the record will fit. we need at least 2 bytes for header and type length */ 942 recSize = payload_len + 2 + type_len + plen + ilen + id_len; 943 944 if ((*p_cur_size + recSize) > max_size) 945 return (NDEF_MSG_INSUFFICIENT_MEM); 946 947 /* See where the new record goes. If at the end, call the 'AddRec' function */ 948 if ( (index >= NDEF_MsgGetNumRecs (p_msg)) 949 || ((p_rec = NDEF_MsgGetRecByIndex(p_msg, index)) == NULL) ) 950 { 951 return NDEF_MsgAddRec (p_msg, max_size, p_cur_size, tnf, p_type, type_len, 952 p_id, id_len, p_payload, payload_len); 953 } 954 955 /* If we are inserting at the beginning, remove the MB bit from the current first */ 956 if (index == 0) 957 *p_msg &= ~NDEF_MB_MASK; 958 959 /* Make space for the new record */ 960 shiftdown (p_rec, (UINT32)(*p_cur_size - (p_rec - p_msg)), recSize); 961 962 /* If adding at the beginning, set begin bit */ 963 if (index == 0) 964 *p_rec = tnf | NDEF_MB_MASK; 965 else 966 *p_rec = tnf; 967 968 if (plen == 1) 969 *p_rec |= NDEF_SR_MASK; 970 971 if (ilen != 0) 972 *p_rec |= NDEF_IL_MASK; 973 974 p_rec++; 975 976 /* The next byte is the type field length */ 977 *p_rec++ = type_len; 978 979 /* Payload length - can be 1 or 4 bytes */ 980 if (plen == 1) 981 *p_rec++ = (UINT8)payload_len; 982 else 983 UINT32_TO_BE_STREAM (p_rec, payload_len); 984 985 /* ID field Length (optional) */ 986 if (ilen != 0) 987 *p_rec++ = id_len; 988 989 /* Next comes the type */ 990 if (type_len) 991 { 992 if (p_type) 993 memcpy (p_rec, p_type, type_len); 994 995 p_rec += type_len; 996 } 997 998 /* Next comes the ID */ 999 if (ilen != 0) 1000 { 1001 if (p_id) 1002 memcpy (p_rec, p_id, id_len); 1003 1004 p_rec += id_len; 1005 } 1006 1007 /* And lastly the payload. If NULL, the app just wants to reserve memory */ 1008 if (p_payload) 1009 memcpy (p_rec, p_payload, payload_len); 1010 1011 *p_cur_size += recSize; 1012 1013 return (NDEF_OK); 1014} 1015 1016/******************************************************************************* 1017** 1018** Function NDEF_MsgAppendRec 1019** 1020** Description This function adds NDEF records to the end of an NDEF message. 1021** 1022** Returns OK, or error if the record did not fit 1023** *p_cur_size is updated 1024** 1025*******************************************************************************/ 1026extern tNDEF_STATUS NDEF_MsgAppendRec (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, 1027 UINT8 *p_new_rec, UINT32 new_rec_len) 1028{ 1029 UINT8 *p_rec; 1030 tNDEF_STATUS status; 1031 1032 /* First, validate new records */ 1033 if ((status = NDEF_MsgValidate(p_new_rec, new_rec_len, FALSE)) != NDEF_OK) 1034 return (status); 1035 1036 /* First, make sure the record will fit */ 1037 if ((*p_cur_size + new_rec_len) > max_size) 1038 return (NDEF_MSG_INSUFFICIENT_MEM); 1039 1040 /* Find where to copy new record */ 1041 if (*p_cur_size == 0) 1042 p_rec = p_msg; 1043 else 1044 { 1045 /* Find the previous last and clear his 'Message End' bit */ 1046 UINT8 *pLast = NDEF_MsgGetLastRecInMsg (p_msg); 1047 1048 if (!pLast) 1049 return (NDEF_MSG_NO_MSG_END); 1050 1051 *pLast &= ~NDEF_ME_MASK; 1052 p_rec = p_msg + *p_cur_size; 1053 1054 /* clear 'Message Begin' bit of new record */ 1055 *p_new_rec &= ~NDEF_MB_MASK; 1056 } 1057 1058 /* append new records */ 1059 memcpy (p_rec, p_new_rec, new_rec_len); 1060 1061 *p_cur_size += new_rec_len; 1062 1063 return (NDEF_OK); 1064} 1065 1066/******************************************************************************* 1067** 1068** Function NDEF_MsgAppendPayload 1069** 1070** Description This function appends extra payload to a specific record in the 1071** given NDEF message 1072** 1073** Returns OK, or error if the extra payload did not fit 1074** *p_cur_size is updated 1075** 1076*******************************************************************************/ 1077tNDEF_STATUS NDEF_MsgAppendPayload (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, 1078 UINT8 *p_rec, UINT8 *p_add_pl, UINT32 add_pl_len) 1079{ 1080 UINT32 prev_paylen, new_paylen; 1081 UINT8 *p_prev_pl, *pp; 1082 UINT8 incr_lenfld = 0; 1083 UINT8 type_len, id_len; 1084 1085 /* Skip header */ 1086 pp = p_rec + 1; 1087 1088 /* Next byte is the type field length */ 1089 type_len = *pp++; 1090 1091 /* Next is the payload length (1 or 4 bytes) */ 1092 if (*p_rec & NDEF_SR_MASK) 1093 prev_paylen = *pp++; 1094 else 1095 BE_STREAM_TO_UINT32 (prev_paylen, pp); 1096 1097 /* ID field Length */ 1098 if (*p_rec & NDEF_IL_MASK) 1099 id_len = *pp++; 1100 else 1101 id_len = 0; 1102 1103 p_prev_pl = pp + type_len + id_len; 1104 1105 new_paylen = prev_paylen + add_pl_len; 1106 1107 /* Previous payload may be < 256, and this addition may make it larger than 256 */ 1108 /* If that were to happen, the payload length field goes from 1 byte to 4 bytes */ 1109 if ( (prev_paylen < 256) && (new_paylen > 255) ) 1110 incr_lenfld = 3; 1111 1112 /* Check that it all fits */ 1113 if ((*p_cur_size + add_pl_len + incr_lenfld) > max_size) 1114 return (NDEF_MSG_INSUFFICIENT_MEM); 1115 1116 /* Point to payload length field */ 1117 pp = p_rec + 2; 1118 1119 /* If we need to increase the length field from 1 to 4 bytes, do it first */ 1120 if (incr_lenfld) 1121 { 1122 shiftdown (pp + 1, (UINT32)(*p_cur_size - (pp - p_msg) - 1), 3); 1123 p_prev_pl += 3; 1124 } 1125 1126 /* Store in the new length */ 1127 if (new_paylen > 255) 1128 { 1129 *p_rec &= ~NDEF_SR_MASK; 1130 UINT32_TO_BE_STREAM (pp, new_paylen); 1131 } 1132 else 1133 *pp = (UINT8)new_paylen; 1134 1135 /* Point to the end of the previous payload */ 1136 pp = p_prev_pl + prev_paylen; 1137 1138 /* If we are not the last record, make space for the extra payload */ 1139 if ((*p_rec & NDEF_ME_MASK) == 0) 1140 shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), add_pl_len); 1141 1142 /* Now copy in the additional payload data */ 1143 memcpy (pp, p_add_pl, add_pl_len); 1144 1145 *p_cur_size += add_pl_len + incr_lenfld; 1146 1147 return (NDEF_OK); 1148} 1149 1150/******************************************************************************* 1151** 1152** Function NDEF_MsgReplacePayload 1153** 1154** Description This function replaces the payload of a specific record in the 1155** given NDEF message 1156** 1157** Returns OK, or error if the new payload did not fit 1158** *p_cur_size is updated 1159** 1160*******************************************************************************/ 1161tNDEF_STATUS NDEF_MsgReplacePayload (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, 1162 UINT8 *p_rec, UINT8 *p_new_pl, UINT32 new_pl_len) 1163{ 1164 UINT32 prev_paylen; 1165 UINT8 *p_prev_pl, *pp; 1166 UINT32 paylen_delta; 1167 UINT8 type_len, id_len; 1168 1169 /* Skip header */ 1170 pp = p_rec + 1; 1171 1172 /* Next byte is the type field length */ 1173 type_len = *pp++; 1174 1175 /* Next is the payload length (1 or 4 bytes) */ 1176 if (*p_rec & NDEF_SR_MASK) 1177 prev_paylen = *pp++; 1178 else 1179 BE_STREAM_TO_UINT32 (prev_paylen, pp); 1180 1181 /* ID field Length */ 1182 if (*p_rec & NDEF_IL_MASK) 1183 id_len = *pp++; 1184 else 1185 id_len = 0; 1186 1187 p_prev_pl = pp + type_len + id_len; 1188 1189 /* Point to payload length field again */ 1190 pp = p_rec + 2; 1191 1192 if (new_pl_len > prev_paylen) 1193 { 1194 /* New payload is larger than the previous */ 1195 paylen_delta = new_pl_len - prev_paylen; 1196 1197 /* If the previous payload length was < 256, and new is > 255 */ 1198 /* the payload length field goes from 1 byte to 4 bytes */ 1199 if ( (prev_paylen < 256) && (new_pl_len > 255) ) 1200 { 1201 if ((*p_cur_size + paylen_delta + 3) > max_size) 1202 return (NDEF_MSG_INSUFFICIENT_MEM); 1203 1204 shiftdown (pp + 1, (UINT32)(*p_cur_size - (pp - p_msg) - 1), 3); 1205 p_prev_pl += 3; 1206 *p_cur_size += 3; 1207 *p_rec &= ~NDEF_SR_MASK; 1208 } 1209 else if ((*p_cur_size + paylen_delta) > max_size) 1210 return (NDEF_MSG_INSUFFICIENT_MEM); 1211 1212 /* Store in the new length */ 1213 if (new_pl_len > 255) 1214 { 1215 UINT32_TO_BE_STREAM (pp, new_pl_len); 1216 } 1217 else 1218 *pp = (UINT8)new_pl_len; 1219 1220 /* Point to the end of the previous payload */ 1221 pp = p_prev_pl + prev_paylen; 1222 1223 /* If we are not the last record, make space for the extra payload */ 1224 if ((*p_rec & NDEF_ME_MASK) == 0) 1225 shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), paylen_delta); 1226 1227 *p_cur_size += paylen_delta; 1228 } 1229 else if (new_pl_len < prev_paylen) 1230 { 1231 /* New payload is smaller than the previous */ 1232 paylen_delta = prev_paylen - new_pl_len; 1233 1234 /* If the previous payload was > 256, and new is less than 256 */ 1235 /* the payload length field goes from 4 bytes to 1 byte */ 1236 if ( (prev_paylen > 255) && (new_pl_len < 256) ) 1237 { 1238 shiftup (pp + 1, pp + 4, (UINT32)(*p_cur_size - (pp - p_msg) - 3)); 1239 p_prev_pl -= 3; 1240 *p_cur_size -= 3; 1241 *p_rec |= NDEF_SR_MASK; 1242 } 1243 1244 /* Store in the new length */ 1245 if (new_pl_len > 255) 1246 { 1247 UINT32_TO_BE_STREAM (pp, new_pl_len); 1248 } 1249 else 1250 *pp = (UINT8)new_pl_len; 1251 1252 /* Point to the end of the previous payload */ 1253 pp = p_prev_pl + prev_paylen; 1254 1255 /* If we are not the last record, remove the extra space from the previous payload */ 1256 if ((*p_rec & NDEF_ME_MASK) == 0) 1257 shiftup (pp - paylen_delta, pp, (UINT32)(*p_cur_size - (pp - p_msg))); 1258 1259 *p_cur_size -= paylen_delta; 1260 } 1261 1262 /* Now copy in the new payload data */ 1263 if (p_new_pl) 1264 memcpy (p_prev_pl, p_new_pl, new_pl_len); 1265 1266 return (NDEF_OK); 1267} 1268 1269/******************************************************************************* 1270** 1271** Function NDEF_MsgReplaceType 1272** 1273** Description This function replaces the type field of a specific record in the 1274** given NDEF message 1275** 1276** Returns OK, or error if the new type field did not fit 1277** *p_cur_size is updated 1278** 1279*******************************************************************************/ 1280tNDEF_STATUS NDEF_MsgReplaceType (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, 1281 UINT8 *p_rec, UINT8 *p_new_type, UINT8 new_type_len) 1282{ 1283 UINT8 typelen_delta; 1284 UINT8 *p_prev_type, prev_type_len; 1285 UINT8 *pp; 1286 1287 /* Skip header */ 1288 pp = p_rec + 1; 1289 1290 /* Next byte is the type field length */ 1291 prev_type_len = *pp++; 1292 1293 /* Skip the payload length */ 1294 if (*p_rec & NDEF_SR_MASK) 1295 pp += 1; 1296 else 1297 pp += 4; 1298 1299 if (*p_rec & NDEF_IL_MASK) 1300 pp++; 1301 1302 /* Save pointer to the start of the type field */ 1303 p_prev_type = pp; 1304 1305 if (new_type_len > prev_type_len) 1306 { 1307 /* New type is larger than the previous */ 1308 typelen_delta = new_type_len - prev_type_len; 1309 1310 if ((*p_cur_size + typelen_delta) > max_size) 1311 return (NDEF_MSG_INSUFFICIENT_MEM); 1312 1313 /* Point to the end of the previous type, and make space for the extra data */ 1314 pp = p_prev_type + prev_type_len; 1315 shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), typelen_delta); 1316 1317 *p_cur_size += typelen_delta; 1318 } 1319 else if (new_type_len < prev_type_len) 1320 { 1321 /* New type field is smaller than the previous */ 1322 typelen_delta = prev_type_len - new_type_len; 1323 1324 /* Point to the end of the previous type, and shift up to fill the the unused space */ 1325 pp = p_prev_type + prev_type_len; 1326 shiftup (pp - typelen_delta, pp, (UINT32)(*p_cur_size - (pp - p_msg))); 1327 1328 *p_cur_size -= typelen_delta; 1329 } 1330 1331 /* Save in new type length */ 1332 p_rec[1] = new_type_len; 1333 1334 /* Now copy in the new type field data */ 1335 if (p_new_type) 1336 memcpy (p_prev_type, p_new_type, new_type_len); 1337 1338 return (NDEF_OK); 1339} 1340 1341/******************************************************************************* 1342** 1343** Function NDEF_MsgReplaceId 1344** 1345** Description This function replaces the ID field of a specific record in the 1346** given NDEF message 1347** 1348** Returns OK, or error if the new ID field did not fit 1349** *p_cur_size is updated 1350** 1351*******************************************************************************/ 1352tNDEF_STATUS NDEF_MsgReplaceId (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, 1353 UINT8 *p_rec, UINT8 *p_new_id, UINT8 new_id_len) 1354{ 1355 UINT8 idlen_delta; 1356 UINT8 *p_prev_id, *p_idlen_field; 1357 UINT8 prev_id_len, type_len; 1358 UINT8 *pp; 1359 1360 /* Skip header */ 1361 pp = p_rec + 1; 1362 1363 /* Next byte is the type field length */ 1364 type_len = *pp++; 1365 1366 /* Skip the payload length */ 1367 if (*p_rec & NDEF_SR_MASK) 1368 pp += 1; 1369 else 1370 pp += 4; 1371 1372 p_idlen_field = pp; 1373 1374 if (*p_rec & NDEF_IL_MASK) 1375 prev_id_len = *pp++; 1376 else 1377 prev_id_len = 0; 1378 1379 /* Save pointer to the start of the ID field (right after the type field) */ 1380 p_prev_id = pp + type_len; 1381 1382 if (new_id_len > prev_id_len) 1383 { 1384 /* New ID field is larger than the previous */ 1385 idlen_delta = new_id_len - prev_id_len; 1386 1387 /* If the previous ID length was 0, we need to add a 1-byte ID length */ 1388 if (prev_id_len == 0) 1389 { 1390 if ((*p_cur_size + idlen_delta + 1) > max_size) 1391 return (NDEF_MSG_INSUFFICIENT_MEM); 1392 1393 shiftdown (p_idlen_field, (UINT32)(*p_cur_size - (p_idlen_field - p_msg)), 1); 1394 p_prev_id += 1; 1395 *p_cur_size += 1; 1396 *p_rec |= NDEF_IL_MASK; 1397 } 1398 else if ((*p_cur_size + idlen_delta) > max_size) 1399 return (NDEF_MSG_INSUFFICIENT_MEM); 1400 1401 /* Point to the end of the previous ID field, and make space for the extra data */ 1402 pp = p_prev_id + prev_id_len; 1403 shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), idlen_delta); 1404 1405 *p_cur_size += idlen_delta; 1406 } 1407 else if (new_id_len < prev_id_len) 1408 { 1409 /* New ID field is smaller than the previous */ 1410 idlen_delta = prev_id_len - new_id_len; 1411 1412 /* Point to the end of the previous ID, and shift up to fill the the unused space */ 1413 pp = p_prev_id + prev_id_len; 1414 shiftup (pp - idlen_delta, pp, (UINT32)(*p_cur_size - (pp - p_msg))); 1415 1416 *p_cur_size -= idlen_delta; 1417 1418 /* If removing the ID, make sure that length field is also removed */ 1419 if (new_id_len == 0) 1420 { 1421 shiftup (p_idlen_field, p_idlen_field + 1, (UINT32)(*p_cur_size - (p_idlen_field - p_msg - (UINT32)1))); 1422 *p_rec &= ~NDEF_IL_MASK; 1423 *p_cur_size -= 1; 1424 } 1425 } 1426 1427 /* Save in new ID length and data */ 1428 if (new_id_len) 1429 { 1430 *p_idlen_field = new_id_len; 1431 1432 if (p_new_id) 1433 memcpy (p_prev_id, p_new_id, new_id_len); 1434 } 1435 1436 return (NDEF_OK); 1437} 1438 1439/******************************************************************************* 1440** 1441** Function NDEF_MsgRemoveRec 1442** 1443** Description This function removes the record at the given 1444** index in the given NDEF message. 1445** 1446** Returns TRUE if OK, FALSE if the index was invalid 1447** *p_cur_size is updated 1448** 1449*******************************************************************************/ 1450tNDEF_STATUS NDEF_MsgRemoveRec (UINT8 *p_msg, UINT32 *p_cur_size, INT32 index) 1451{ 1452 UINT8 *p_rec = NDEF_MsgGetRecByIndex (p_msg, index); 1453 UINT8 *pNext, *pPrev; 1454 1455 if (!p_rec) 1456 return (NDEF_REC_NOT_FOUND); 1457 1458 /* If this is the first record in the message... */ 1459 if (*p_rec & NDEF_MB_MASK) 1460 { 1461 /* Find the second record (if any) and set his 'Message Begin' bit */ 1462 if ((pNext = NDEF_MsgGetRecByIndex(p_msg, 1)) != NULL) 1463 { 1464 *pNext |= NDEF_MB_MASK; 1465 1466 *p_cur_size -= (UINT32)(pNext - p_msg); 1467 1468 shiftup (p_msg, pNext, *p_cur_size); 1469 } 1470 else 1471 *p_cur_size = 0; /* No more records, lenght must be zero */ 1472 1473 return (NDEF_OK); 1474 } 1475 1476 /* If this is the last record in the message... */ 1477 if (*p_rec & NDEF_ME_MASK) 1478 { 1479 if (index > 0) 1480 { 1481 /* Find the previous record and set his 'Message End' bit */ 1482 if ((pPrev = NDEF_MsgGetRecByIndex(p_msg, index - 1)) == NULL) 1483 return (FALSE); 1484 1485 *pPrev |= NDEF_ME_MASK; 1486 } 1487 *p_cur_size = (UINT32)(p_rec - p_msg); 1488 1489 return (NDEF_OK); 1490 } 1491 1492 /* Not the first or the last... get the address of the next record */ 1493 if ((pNext = NDEF_MsgGetNextRec (p_rec)) == NULL) 1494 return (FALSE); 1495 1496 /* We are removing p_rec, so shift from pNext to the end */ 1497 shiftup (p_rec, pNext, (UINT32)(*p_cur_size - (pNext - p_msg))); 1498 1499 *p_cur_size -= (UINT32)(pNext - p_rec); 1500 1501 return (NDEF_OK); 1502} 1503 1504 1505/******************************************************************************* 1506** 1507** Function NDEF_MsgCopyAndDechunk 1508** 1509** Description This function copies and de-chunks an NDEF message. 1510** It is assumed that the destination is at least as large 1511** as the source, since the source may not actually contain 1512** any chunks. 1513** 1514** Returns The output byte count 1515** 1516*******************************************************************************/ 1517tNDEF_STATUS NDEF_MsgCopyAndDechunk (UINT8 *p_src, UINT32 src_len, UINT8 *p_dest, UINT32 *p_out_len) 1518{ 1519 UINT32 out_len, max_out_len; 1520 UINT8 *p_rec; 1521 UINT8 *p_prev_rec = p_dest; 1522 UINT8 *p_type, *p_id, *p_pay; 1523 UINT8 type_len, id_len, tnf; 1524 UINT32 pay_len; 1525 tNDEF_STATUS status; 1526 1527 /* First, validate the source */ 1528 if ((status = NDEF_MsgValidate(p_src, src_len, TRUE)) != NDEF_OK) 1529 return (status); 1530 1531 /* The output buffer must be at least as large as the input buffer */ 1532 max_out_len = src_len; 1533 1534 /* Initialize output */ 1535 NDEF_MsgInit (p_dest, max_out_len, &out_len); 1536 1537 p_rec = p_src; 1538 1539 /* Now, copy record by record */ 1540 while (p_rec != NULL) 1541 { 1542 p_type = NDEF_RecGetType (p_rec, &tnf, &type_len); 1543 p_id = NDEF_RecGetId (p_rec, &id_len); 1544 p_pay = NDEF_RecGetPayload (p_rec, &pay_len); 1545 1546 /* If this is the continuation of a chunk, append the payload to the previous */ 1547 if (tnf == NDEF_TNF_UNCHANGED) 1548 { 1549 NDEF_MsgAppendPayload (p_dest, max_out_len, &out_len, p_prev_rec, p_pay, pay_len); 1550 } 1551 else 1552 { 1553 p_prev_rec = p_dest + out_len; 1554 1555 NDEF_MsgAddRec (p_dest, max_out_len, &out_len, tnf, p_type, type_len, 1556 p_id, id_len, p_pay, pay_len); 1557 } 1558 1559 p_rec = NDEF_MsgGetNextRec (p_rec); 1560 } 1561 1562 *p_out_len = out_len; 1563 1564 return (NDEF_OK); 1565} 1566 1567