| /****************************************************************************** |
| * |
| * Copyright (C) 2010-2012 Broadcom Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ******************************************************************************/ |
| |
| /****************************************************************************** |
| * |
| * This file contains source code for some utility functions to help parse |
| * and build NFC Data Exchange Format (NDEF) messages |
| * |
| ******************************************************************************/ |
| #include <string.h> |
| #include "ndef_utils.h" |
| |
| /******************************************************************************* |
| ** |
| ** Static Local Functions |
| ** |
| *******************************************************************************/ |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function shiftdown |
| ** |
| ** Description shift memory down (to make space to insert a record) |
| ** |
| *******************************************************************************/ |
| static void shiftdown (UINT8 *p_mem, UINT32 len, UINT32 shift_amount) |
| { |
| register UINT8 *ps = p_mem + len - 1; |
| register UINT8 *pd = ps + shift_amount; |
| register UINT32 xx; |
| |
| for (xx = 0; xx < len; xx++) |
| *pd-- = *ps--; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function shiftup |
| ** |
| ** Description shift memory up (to delete a record) |
| ** |
| *******************************************************************************/ |
| static void shiftup (UINT8 *p_dest, UINT8 *p_src, UINT32 len) |
| { |
| register UINT8 *ps = p_src; |
| register UINT8 *pd = p_dest; |
| register UINT32 xx; |
| |
| for (xx = 0; xx < len; xx++) |
| *pd++ = *ps++; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgValidate |
| ** |
| ** Description This function validates an NDEF message. |
| ** |
| ** Returns TRUE if all OK, or FALSE if the message is invalid. |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgValidate (UINT8 *p_msg, UINT32 msg_len, BOOLEAN b_allow_chunks) |
| { |
| UINT8 *p_rec = p_msg; |
| UINT8 *p_end = p_msg + msg_len; |
| UINT8 rec_hdr=0, type_len, id_len; |
| int count; |
| UINT32 payload_len; |
| BOOLEAN bInChunk = FALSE; |
| |
| if ( (p_msg == NULL) || (msg_len < 3) ) |
| return (NDEF_MSG_TOO_SHORT); |
| |
| /* The first record must have the MB bit set */ |
| if ((*p_msg & NDEF_MB_MASK) == 0) |
| return (NDEF_MSG_NO_MSG_BEGIN); |
| |
| /* The first record cannot be a chunk */ |
| if ((*p_msg & NDEF_TNF_MASK) == NDEF_TNF_UNCHANGED) |
| return (NDEF_MSG_UNEXPECTED_CHUNK); |
| |
| for (count = 0; p_rec < p_end; count++) |
| { |
| /* if less than short record header */ |
| if (p_rec + 3 > p_end) |
| return (NDEF_MSG_TOO_SHORT); |
| |
| rec_hdr = *p_rec++; |
| |
| /* The second and all subsequent records must NOT have the MB bit set */ |
| if ( (count > 0) && (rec_hdr & NDEF_MB_MASK) ) |
| return (NDEF_MSG_EXTRA_MSG_BEGIN); |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| { |
| /* if less than 4 bytes payload length */ |
| if (p_rec + 4 > p_end) |
| return (NDEF_MSG_TOO_SHORT); |
| |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| } |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| { |
| /* if less than 1 byte ID field length */ |
| if (p_rec + 1 > p_end) |
| return (NDEF_MSG_TOO_SHORT); |
| |
| id_len = *p_rec++; |
| } |
| else |
| id_len = 0; |
| |
| /* A chunk must have type "unchanged", and no type or ID fields */ |
| if (rec_hdr & NDEF_CF_MASK) |
| { |
| if (!b_allow_chunks) |
| return (NDEF_MSG_UNEXPECTED_CHUNK); |
| |
| /* Inside a chunk, the type must be unchanged and no type or ID field i sallowed */ |
| if (bInChunk) |
| { |
| if ( (type_len != 0) || (id_len != 0) || ((rec_hdr & NDEF_TNF_MASK) != NDEF_TNF_UNCHANGED) ) |
| return (NDEF_MSG_INVALID_CHUNK); |
| } |
| else |
| { |
| /* First record of a chunk must NOT have type "unchanged" */ |
| if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_UNCHANGED) |
| return (NDEF_MSG_INVALID_CHUNK); |
| |
| bInChunk = TRUE; |
| } |
| } |
| else |
| { |
| /* This may be the last guy in a chunk. */ |
| if (bInChunk) |
| { |
| if ( (type_len != 0) || (id_len != 0) || ((rec_hdr & NDEF_TNF_MASK) != NDEF_TNF_UNCHANGED) ) |
| return (NDEF_MSG_INVALID_CHUNK); |
| |
| bInChunk = FALSE; |
| } |
| else |
| { |
| /* If not in a chunk, the record must NOT have type "unchanged" */ |
| if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_UNCHANGED) |
| return (NDEF_MSG_INVALID_CHUNK); |
| } |
| } |
| |
| /* An empty record must NOT have a type, ID or payload */ |
| if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_EMPTY) |
| { |
| if ( (type_len != 0) || (id_len != 0) || (payload_len != 0) ) |
| return (NDEF_MSG_INVALID_EMPTY_REC); |
| } |
| |
| if ((rec_hdr & NDEF_TNF_MASK) == NDEF_TNF_UNKNOWN) |
| { |
| if (type_len != 0) |
| return (NDEF_MSG_LENGTH_MISMATCH); |
| } |
| |
| /* Point to next record */ |
| p_rec += (payload_len + type_len + id_len); |
| |
| if (rec_hdr & NDEF_ME_MASK) |
| break; |
| |
| rec_hdr = 0; |
| } |
| |
| /* The last record should have the ME bit set */ |
| if ((rec_hdr & NDEF_ME_MASK) == 0) |
| return (NDEF_MSG_NO_MSG_END); |
| |
| /* p_rec should equal p_end if all the length fields were correct */ |
| if (p_rec != p_end) |
| return (NDEF_MSG_LENGTH_MISMATCH); |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetNumRecs |
| ** |
| ** Description This function gets the number of records in the given NDEF |
| ** message. |
| ** |
| ** Returns The record count, or 0 if the message is invalid. |
| ** |
| *******************************************************************************/ |
| INT32 NDEF_MsgGetNumRecs (UINT8 *p_msg) |
| { |
| UINT8 *p_rec = p_msg; |
| UINT8 rec_hdr, type_len, id_len; |
| int count; |
| UINT32 payload_len; |
| |
| for (count = 0; ; ) |
| { |
| count++; |
| |
| rec_hdr = *p_rec++; |
| |
| if (rec_hdr & NDEF_ME_MASK) |
| break; |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* Point to next record */ |
| p_rec += (payload_len + type_len + id_len); |
| } |
| |
| /* Return the number of records found */ |
| return (count); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetRecLength |
| ** |
| ** Description This function returns length of the current record in the given |
| ** NDEF message. |
| ** |
| ** Returns Length of record |
| ** |
| *******************************************************************************/ |
| UINT32 NDEF_MsgGetRecLength (UINT8 *p_cur_rec) |
| { |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 rec_len = 0; |
| UINT32 payload_len; |
| |
| /* Get the current record's header */ |
| rec_hdr = *p_cur_rec++; |
| rec_len++; |
| |
| /* Type field length */ |
| type_len = *p_cur_rec++; |
| rec_len++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| { |
| payload_len = *p_cur_rec++; |
| rec_len++; |
| } |
| else |
| { |
| BE_STREAM_TO_UINT32 (payload_len, p_cur_rec); |
| rec_len += 4; |
| } |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| { |
| id_len = *p_cur_rec++; |
| rec_len++; |
| } |
| else |
| id_len = 0; |
| |
| /* Total length of record */ |
| rec_len += (payload_len + type_len + id_len); |
| |
| return (rec_len); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetNextRec |
| ** |
| ** Description This function gets a pointer to the next record in the given |
| ** NDEF message. If the current record pointer is NULL, a pointer |
| ** to the first record is returned. |
| ** |
| ** Returns Pointer to the start of the record, or NULL if no more |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetNextRec (UINT8 *p_cur_rec) |
| { |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| /* Get the current record's header */ |
| rec_hdr = *p_cur_rec++; |
| |
| /* If this is the last record, return NULL */ |
| if (rec_hdr & NDEF_ME_MASK) |
| return (NULL); |
| |
| /* Type field length */ |
| type_len = *p_cur_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_cur_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_cur_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_cur_rec++; |
| else |
| id_len = 0; |
| |
| /* Point to next record */ |
| p_cur_rec += (payload_len + type_len + id_len); |
| |
| return (p_cur_rec); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetRecByIndex |
| ** |
| ** Description This function gets a pointer to the record with the given |
| ** index (0-based index) in the given NDEF message. |
| ** |
| ** Returns Pointer to the start of the record, or NULL |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetRecByIndex (UINT8 *p_msg, INT32 index) |
| { |
| UINT8 *p_rec = p_msg; |
| UINT8 rec_hdr, type_len, id_len; |
| INT32 count; |
| UINT32 payload_len; |
| |
| for (count = 0; ; count++) |
| { |
| if (count == index) |
| return (p_rec); |
| |
| rec_hdr = *p_rec++; |
| |
| if (rec_hdr & NDEF_ME_MASK) |
| return (NULL); |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* Point to next record */ |
| p_rec += (payload_len + type_len + id_len); |
| } |
| |
| /* If here, there is no record of that index */ |
| return (NULL); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetLastRecInMsg |
| ** |
| ** Description This function gets a pointer to the last record in the |
| ** given NDEF message. |
| ** |
| ** Returns Pointer to the start of the last record, or NULL if some problem |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetLastRecInMsg (UINT8 *p_msg) |
| { |
| UINT8 *p_rec = p_msg; |
| UINT8 *pRecStart; |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| for ( ; ; ) |
| { |
| pRecStart = p_rec; |
| rec_hdr = *p_rec++; |
| |
| if (rec_hdr & NDEF_ME_MASK) |
| break; |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* Point to next record */ |
| p_rec += (payload_len + type_len + id_len); |
| } |
| |
| return (pRecStart); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetFirstRecByType |
| ** |
| ** Description This function gets a pointer to the first record with the given |
| ** record type in the given NDEF message. |
| ** |
| ** Returns Pointer to the start of the record, or NULL |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetFirstRecByType (UINT8 *p_msg, UINT8 tnf, UINT8 *p_type, UINT8 tlen) |
| { |
| UINT8 *p_rec = p_msg; |
| UINT8 *pRecStart; |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| for ( ; ; ) |
| { |
| pRecStart = p_rec; |
| |
| rec_hdr = *p_rec++; |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* At this point, p_rec points to the start of the type field. We need to */ |
| /* compare the type of the type, the length of the type and the data */ |
| if ( ((rec_hdr & NDEF_TNF_MASK) == tnf) |
| && (type_len == tlen) |
| && (!memcmp (p_rec, p_type, tlen)) ) |
| return (pRecStart); |
| |
| /* If this was the last record, return NULL */ |
| if (rec_hdr & NDEF_ME_MASK) |
| return (NULL); |
| |
| /* Point to next record */ |
| p_rec += (payload_len + type_len + id_len); |
| } |
| |
| /* If here, there is no record of that type */ |
| return (NULL); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetNextRecByType |
| ** |
| ** Description This function gets a pointer to the next record with the given |
| ** record type in the given NDEF message. |
| ** |
| ** Returns Pointer to the start of the record, or NULL |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetNextRecByType (UINT8 *p_cur_rec, UINT8 tnf, UINT8 *p_type, UINT8 tlen) |
| { |
| UINT8 *p_rec; |
| UINT8 *pRecStart; |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| /* If this is the last record in the message, return NULL */ |
| if ((p_rec = NDEF_MsgGetNextRec (p_cur_rec)) == NULL) |
| return (NULL); |
| |
| for ( ; ; ) |
| { |
| pRecStart = p_rec; |
| |
| rec_hdr = *p_rec++; |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* At this point, p_rec points to the start of the type field. We need to */ |
| /* compare the type of the type, the length of the type and the data */ |
| if ( ((rec_hdr & NDEF_TNF_MASK) == tnf) |
| && (type_len == tlen) |
| && (!memcmp (p_rec, p_type, tlen)) ) |
| return (pRecStart); |
| |
| /* If this was the last record, return NULL */ |
| if (rec_hdr & NDEF_ME_MASK) |
| break; |
| |
| /* Point to next record */ |
| p_rec += (payload_len + type_len + id_len); |
| } |
| |
| /* If here, there is no record of that type */ |
| return (NULL); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetFirstRecById |
| ** |
| ** Description This function gets a pointer to the first record with the given |
| ** record id in the given NDEF message. |
| ** |
| ** Returns Pointer to the start of the record, or NULL |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetFirstRecById (UINT8 *p_msg, UINT8 *p_id, UINT8 ilen) |
| { |
| UINT8 *p_rec = p_msg; |
| UINT8 *pRecStart; |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| for ( ; ; ) |
| { |
| pRecStart = p_rec; |
| |
| rec_hdr = *p_rec++; |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* At this point, p_rec points to the start of the type field. Skip it */ |
| p_rec += type_len; |
| |
| /* At this point, p_rec points to the start of the ID field. Compare length and data */ |
| if ( (id_len == ilen) && (!memcmp (p_rec, p_id, ilen)) ) |
| return (pRecStart); |
| |
| /* If this was the last record, return NULL */ |
| if (rec_hdr & NDEF_ME_MASK) |
| return (NULL); |
| |
| /* Point to next record */ |
| p_rec += (id_len + payload_len); |
| } |
| |
| /* If here, there is no record of that ID */ |
| return (NULL); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgGetNextRecById |
| ** |
| ** Description This function gets a pointer to the next record with the given |
| ** record id in the given NDEF message. |
| ** |
| ** Returns Pointer to the start of the record, or NULL |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_MsgGetNextRecById (UINT8 *p_cur_rec, UINT8 *p_id, UINT8 ilen) |
| { |
| UINT8 *p_rec; |
| UINT8 *pRecStart; |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| /* If this is the last record in the message, return NULL */ |
| if ((p_rec = NDEF_MsgGetNextRec (p_cur_rec)) == NULL) |
| return (NULL); |
| |
| for ( ; ; ) |
| { |
| pRecStart = p_rec; |
| |
| rec_hdr = *p_rec++; |
| |
| /* Type field length */ |
| type_len = *p_rec++; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* At this point, p_rec points to the start of the type field. Skip it */ |
| p_rec += type_len; |
| |
| /* At this point, p_rec points to the start of the ID field. Compare length and data */ |
| if ( (id_len == ilen) && (!memcmp (p_rec, p_id, ilen)) ) |
| return (pRecStart); |
| |
| /* If this was the last record, return NULL */ |
| if (rec_hdr & NDEF_ME_MASK) |
| break; |
| |
| /* Point to next record */ |
| p_rec += (id_len + payload_len); |
| } |
| |
| /* If here, there is no record of that ID */ |
| return (NULL); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_RecGetType |
| ** |
| ** Description This function gets a pointer to the record type for the given NDEF record. |
| ** |
| ** Returns Pointer to Type (NULL if none). TNF and len are filled in. |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_RecGetType (UINT8 *p_rec, UINT8 *p_tnf, UINT8 *p_type_len) |
| { |
| UINT8 rec_hdr, type_len; |
| |
| /* First byte is the record header */ |
| rec_hdr = *p_rec++; |
| |
| /* Next byte is the type field length */ |
| type_len = *p_rec++; |
| |
| /* Skip the payload length */ |
| if (rec_hdr & NDEF_SR_MASK) |
| p_rec += 1; |
| else |
| p_rec += 4; |
| |
| /* Skip ID field Length, if present */ |
| if (rec_hdr & NDEF_IL_MASK) |
| p_rec++; |
| |
| /* At this point, p_rec points to the start of the type field. */ |
| *p_type_len = type_len; |
| *p_tnf = rec_hdr & NDEF_TNF_MASK; |
| |
| if (type_len == 0) |
| return (NULL); |
| else |
| return (p_rec); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_RecGetId |
| ** |
| ** Description This function gets a pointer to the record id for the given NDEF record. |
| ** |
| ** Returns Pointer to Id (NULL if none). ID Len is filled in. |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_RecGetId (UINT8 *p_rec, UINT8 *p_id_len) |
| { |
| UINT8 rec_hdr, type_len; |
| |
| /* First byte is the record header */ |
| rec_hdr = *p_rec++; |
| |
| /* Next byte is the type field length */ |
| type_len = *p_rec++; |
| |
| /* Skip the payload length */ |
| if (rec_hdr & NDEF_SR_MASK) |
| p_rec++; |
| else |
| p_rec += 4; |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| *p_id_len = *p_rec++; |
| else |
| *p_id_len = 0; |
| |
| /* p_rec now points to the start of the type field. The ID field follows it */ |
| if (*p_id_len == 0) |
| return (NULL); |
| else |
| return (p_rec + type_len); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_RecGetPayload |
| ** |
| ** Description This function gets a pointer to the payload for the given NDEF record. |
| ** |
| ** Returns a pointer to the payload (or NULL none). Payload len filled in. |
| ** |
| *******************************************************************************/ |
| UINT8 *NDEF_RecGetPayload (UINT8 *p_rec, UINT32 *p_payload_len) |
| { |
| UINT8 rec_hdr, type_len, id_len; |
| UINT32 payload_len; |
| |
| /* First byte is the record header */ |
| rec_hdr = *p_rec++; |
| |
| /* Next byte is the type field length */ |
| type_len = *p_rec++; |
| |
| /* Next is the payload length (1 or 4 bytes) */ |
| if (rec_hdr & NDEF_SR_MASK) |
| payload_len = *p_rec++; |
| else |
| BE_STREAM_TO_UINT32 (payload_len, p_rec); |
| |
| *p_payload_len = payload_len; |
| |
| /* ID field Length */ |
| if (rec_hdr & NDEF_IL_MASK) |
| id_len = *p_rec++; |
| else |
| id_len = 0; |
| |
| /* p_rec now points to the start of the type field. The ID field follows it, then the payload */ |
| if (payload_len == 0) |
| return (NULL); |
| else |
| return (p_rec + type_len + id_len); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgInit |
| ** |
| ** Description This function initializes an NDEF message. |
| ** |
| ** Returns void |
| ** *p_cur_size is initialized to 0 |
| ** |
| *******************************************************************************/ |
| void NDEF_MsgInit (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size) |
| { |
| *p_cur_size = 0; |
| memset (p_msg, 0, max_size); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgAddRec |
| ** |
| ** Description This function adds an NDEF record to the end of an NDEF message. |
| ** |
| ** Returns OK, or error if the record did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| extern tNDEF_STATUS NDEF_MsgAddRec (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, |
| UINT8 tnf, UINT8 *p_type, UINT8 type_len, |
| UINT8 *p_id, UINT8 id_len, |
| UINT8 *p_payload, UINT32 payload_len) |
| { |
| UINT8 *p_rec = p_msg + *p_cur_size; |
| UINT32 recSize; |
| int plen = (payload_len < 256) ? 1 : 4; |
| int ilen = (id_len == 0) ? 0 : 1; |
| |
| if (tnf > NDEF_TNF_RESERVED) |
| { |
| tnf = NDEF_TNF_UNKNOWN; |
| type_len = 0; |
| } |
| |
| /* First, make sure the record will fit. we need at least 2 bytes for header and type length */ |
| recSize = payload_len + 2 + type_len + plen + ilen + id_len; |
| |
| if ((*p_cur_size + recSize) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* Construct the record header. For the first record, set both begin and end bits */ |
| if (*p_cur_size == 0) |
| *p_rec = tnf | NDEF_MB_MASK | NDEF_ME_MASK; |
| else |
| { |
| /* Find the previous last and clear his 'Message End' bit */ |
| UINT8 *pLast = NDEF_MsgGetLastRecInMsg (p_msg); |
| |
| if (!pLast) |
| return (FALSE); |
| |
| *pLast &= ~NDEF_ME_MASK; |
| *p_rec = tnf | NDEF_ME_MASK; |
| } |
| |
| if (plen == 1) |
| *p_rec |= NDEF_SR_MASK; |
| |
| if (ilen != 0) |
| *p_rec |= NDEF_IL_MASK; |
| |
| p_rec++; |
| |
| /* The next byte is the type field length */ |
| *p_rec++ = type_len; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (plen == 1) |
| *p_rec++ = (UINT8)payload_len; |
| else |
| UINT32_TO_BE_STREAM (p_rec, payload_len); |
| |
| /* ID field Length (optional) */ |
| if (ilen > 0) |
| *p_rec++ = id_len; |
| |
| /* Next comes the type */ |
| if (type_len) |
| { |
| if (p_type) |
| memcpy (p_rec, p_type, type_len); |
| |
| p_rec += type_len; |
| } |
| |
| /* Next comes the ID */ |
| if (id_len) |
| { |
| if (p_id) |
| memcpy (p_rec, p_id, id_len); |
| |
| p_rec += id_len; |
| } |
| |
| /* And lastly the payload. If NULL, the app just wants to reserve memory */ |
| if (p_payload) |
| memcpy (p_rec, p_payload, payload_len); |
| |
| *p_cur_size += recSize; |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgInsertRec |
| ** |
| ** Description This function inserts a record at a specific index into the |
| ** given NDEF message |
| ** |
| ** Returns OK, or error if the record did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| extern tNDEF_STATUS NDEF_MsgInsertRec (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, INT32 index, |
| UINT8 tnf, UINT8 *p_type, UINT8 type_len, |
| UINT8 *p_id, UINT8 id_len, |
| UINT8 *p_payload, UINT32 payload_len) |
| { |
| UINT8 *p_rec; |
| UINT32 recSize; |
| INT32 plen = (payload_len < 256) ? 1 : 4; |
| INT32 ilen = (id_len == 0) ? 0 : 1; |
| |
| /* First, make sure the record will fit. we need at least 2 bytes for header and type length */ |
| recSize = payload_len + 2 + type_len + plen + ilen + id_len; |
| |
| if ((*p_cur_size + recSize) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* See where the new record goes. If at the end, call the 'AddRec' function */ |
| if ( (index >= NDEF_MsgGetNumRecs (p_msg)) |
| || ((p_rec = NDEF_MsgGetRecByIndex(p_msg, index)) == NULL) ) |
| { |
| return NDEF_MsgAddRec (p_msg, max_size, p_cur_size, tnf, p_type, type_len, |
| p_id, id_len, p_payload, payload_len); |
| } |
| |
| /* If we are inserting at the beginning, remove the MB bit from the current first */ |
| if (index == 0) |
| *p_msg &= ~NDEF_MB_MASK; |
| |
| /* Make space for the new record */ |
| shiftdown (p_rec, (UINT32)(*p_cur_size - (p_rec - p_msg)), recSize); |
| |
| /* If adding at the beginning, set begin bit */ |
| if (index == 0) |
| *p_rec = tnf | NDEF_MB_MASK; |
| else |
| *p_rec = tnf; |
| |
| if (plen == 1) |
| *p_rec |= NDEF_SR_MASK; |
| |
| if (ilen != 0) |
| *p_rec |= NDEF_IL_MASK; |
| |
| p_rec++; |
| |
| /* The next byte is the type field length */ |
| *p_rec++ = type_len; |
| |
| /* Payload length - can be 1 or 4 bytes */ |
| if (plen == 1) |
| *p_rec++ = (UINT8)payload_len; |
| else |
| UINT32_TO_BE_STREAM (p_rec, payload_len); |
| |
| /* ID field Length (optional) */ |
| if (ilen != 0) |
| *p_rec++ = id_len; |
| |
| /* Next comes the type */ |
| if (type_len) |
| { |
| if (p_type) |
| memcpy (p_rec, p_type, type_len); |
| |
| p_rec += type_len; |
| } |
| |
| /* Next comes the ID */ |
| if (ilen != 0) |
| { |
| if (p_id) |
| memcpy (p_rec, p_id, id_len); |
| |
| p_rec += id_len; |
| } |
| |
| /* And lastly the payload. If NULL, the app just wants to reserve memory */ |
| if (p_payload) |
| memcpy (p_rec, p_payload, payload_len); |
| |
| *p_cur_size += recSize; |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgAppendRec |
| ** |
| ** Description This function adds NDEF records to the end of an NDEF message. |
| ** |
| ** Returns OK, or error if the record did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| extern tNDEF_STATUS NDEF_MsgAppendRec (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, |
| UINT8 *p_new_rec, UINT32 new_rec_len) |
| { |
| UINT8 *p_rec; |
| tNDEF_STATUS status; |
| |
| /* First, validate new records */ |
| if ((status = NDEF_MsgValidate(p_new_rec, new_rec_len, FALSE)) != NDEF_OK) |
| return (status); |
| |
| /* First, make sure the record will fit */ |
| if ((*p_cur_size + new_rec_len) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* Find where to copy new record */ |
| if (*p_cur_size == 0) |
| p_rec = p_msg; |
| else |
| { |
| /* Find the previous last and clear his 'Message End' bit */ |
| UINT8 *pLast = NDEF_MsgGetLastRecInMsg (p_msg); |
| |
| if (!pLast) |
| return (NDEF_MSG_NO_MSG_END); |
| |
| *pLast &= ~NDEF_ME_MASK; |
| p_rec = p_msg + *p_cur_size; |
| |
| /* clear 'Message Begin' bit of new record */ |
| *p_new_rec &= ~NDEF_MB_MASK; |
| } |
| |
| /* append new records */ |
| memcpy (p_rec, p_new_rec, new_rec_len); |
| |
| *p_cur_size += new_rec_len; |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgAppendPayload |
| ** |
| ** Description This function appends extra payload to a specific record in the |
| ** given NDEF message |
| ** |
| ** Returns OK, or error if the extra payload did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgAppendPayload (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, |
| UINT8 *p_rec, UINT8 *p_add_pl, UINT32 add_pl_len) |
| { |
| UINT32 prev_paylen, new_paylen; |
| UINT8 *p_prev_pl, *pp; |
| UINT8 incr_lenfld = 0; |
| UINT8 type_len, id_len; |
| |
| /* Skip header */ |
| pp = p_rec + 1; |
| |
| /* Next byte is the type field length */ |
| type_len = *pp++; |
| |
| /* Next is the payload length (1 or 4 bytes) */ |
| if (*p_rec & NDEF_SR_MASK) |
| prev_paylen = *pp++; |
| else |
| BE_STREAM_TO_UINT32 (prev_paylen, pp); |
| |
| /* ID field Length */ |
| if (*p_rec & NDEF_IL_MASK) |
| id_len = *pp++; |
| else |
| id_len = 0; |
| |
| p_prev_pl = pp + type_len + id_len; |
| |
| new_paylen = prev_paylen + add_pl_len; |
| |
| /* Previous payload may be < 256, and this addition may make it larger than 256 */ |
| /* If that were to happen, the payload length field goes from 1 byte to 4 bytes */ |
| if ( (prev_paylen < 256) && (new_paylen > 255) ) |
| incr_lenfld = 3; |
| |
| /* Check that it all fits */ |
| if ((*p_cur_size + add_pl_len + incr_lenfld) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* Point to payload length field */ |
| pp = p_rec + 2; |
| |
| /* If we need to increase the length field from 1 to 4 bytes, do it first */ |
| if (incr_lenfld) |
| { |
| shiftdown (pp + 1, (UINT32)(*p_cur_size - (pp - p_msg) - 1), 3); |
| p_prev_pl += 3; |
| } |
| |
| /* Store in the new length */ |
| if (new_paylen > 255) |
| { |
| *p_rec &= ~NDEF_SR_MASK; |
| UINT32_TO_BE_STREAM (pp, new_paylen); |
| } |
| else |
| *pp = (UINT8)new_paylen; |
| |
| /* Point to the end of the previous payload */ |
| pp = p_prev_pl + prev_paylen; |
| |
| /* If we are not the last record, make space for the extra payload */ |
| if ((*p_rec & NDEF_ME_MASK) == 0) |
| shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), add_pl_len); |
| |
| /* Now copy in the additional payload data */ |
| memcpy (pp, p_add_pl, add_pl_len); |
| |
| *p_cur_size += add_pl_len + incr_lenfld; |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgReplacePayload |
| ** |
| ** Description This function replaces the payload of a specific record in the |
| ** given NDEF message |
| ** |
| ** Returns OK, or error if the new payload did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgReplacePayload (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, |
| UINT8 *p_rec, UINT8 *p_new_pl, UINT32 new_pl_len) |
| { |
| UINT32 prev_paylen; |
| UINT8 *p_prev_pl, *pp; |
| UINT32 paylen_delta; |
| UINT8 type_len, id_len; |
| |
| /* Skip header */ |
| pp = p_rec + 1; |
| |
| /* Next byte is the type field length */ |
| type_len = *pp++; |
| |
| /* Next is the payload length (1 or 4 bytes) */ |
| if (*p_rec & NDEF_SR_MASK) |
| prev_paylen = *pp++; |
| else |
| BE_STREAM_TO_UINT32 (prev_paylen, pp); |
| |
| /* ID field Length */ |
| if (*p_rec & NDEF_IL_MASK) |
| id_len = *pp++; |
| else |
| id_len = 0; |
| |
| p_prev_pl = pp + type_len + id_len; |
| |
| /* Point to payload length field again */ |
| pp = p_rec + 2; |
| |
| if (new_pl_len > prev_paylen) |
| { |
| /* New payload is larger than the previous */ |
| paylen_delta = new_pl_len - prev_paylen; |
| |
| /* If the previous payload length was < 256, and new is > 255 */ |
| /* the payload length field goes from 1 byte to 4 bytes */ |
| if ( (prev_paylen < 256) && (new_pl_len > 255) ) |
| { |
| if ((*p_cur_size + paylen_delta + 3) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| shiftdown (pp + 1, (UINT32)(*p_cur_size - (pp - p_msg) - 1), 3); |
| p_prev_pl += 3; |
| *p_cur_size += 3; |
| *p_rec &= ~NDEF_SR_MASK; |
| } |
| else if ((*p_cur_size + paylen_delta) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* Store in the new length */ |
| if (new_pl_len > 255) |
| { |
| UINT32_TO_BE_STREAM (pp, new_pl_len); |
| } |
| else |
| *pp = (UINT8)new_pl_len; |
| |
| /* Point to the end of the previous payload */ |
| pp = p_prev_pl + prev_paylen; |
| |
| /* If we are not the last record, make space for the extra payload */ |
| if ((*p_rec & NDEF_ME_MASK) == 0) |
| shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), paylen_delta); |
| |
| *p_cur_size += paylen_delta; |
| } |
| else if (new_pl_len < prev_paylen) |
| { |
| /* New payload is smaller than the previous */ |
| paylen_delta = prev_paylen - new_pl_len; |
| |
| /* If the previous payload was > 256, and new is less than 256 */ |
| /* the payload length field goes from 4 bytes to 1 byte */ |
| if ( (prev_paylen > 255) && (new_pl_len < 256) ) |
| { |
| shiftup (pp + 1, pp + 4, (UINT32)(*p_cur_size - (pp - p_msg) - 3)); |
| p_prev_pl -= 3; |
| *p_cur_size -= 3; |
| *p_rec |= NDEF_SR_MASK; |
| } |
| |
| /* Store in the new length */ |
| if (new_pl_len > 255) |
| { |
| UINT32_TO_BE_STREAM (pp, new_pl_len); |
| } |
| else |
| *pp = (UINT8)new_pl_len; |
| |
| /* Point to the end of the previous payload */ |
| pp = p_prev_pl + prev_paylen; |
| |
| /* If we are not the last record, remove the extra space from the previous payload */ |
| if ((*p_rec & NDEF_ME_MASK) == 0) |
| shiftup (pp - paylen_delta, pp, (UINT32)(*p_cur_size - (pp - p_msg))); |
| |
| *p_cur_size -= paylen_delta; |
| } |
| |
| /* Now copy in the new payload data */ |
| if (p_new_pl) |
| memcpy (p_prev_pl, p_new_pl, new_pl_len); |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgReplaceType |
| ** |
| ** Description This function replaces the type field of a specific record in the |
| ** given NDEF message |
| ** |
| ** Returns OK, or error if the new type field did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgReplaceType (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, |
| UINT8 *p_rec, UINT8 *p_new_type, UINT8 new_type_len) |
| { |
| UINT8 typelen_delta; |
| UINT8 *p_prev_type, prev_type_len; |
| UINT8 *pp; |
| |
| /* Skip header */ |
| pp = p_rec + 1; |
| |
| /* Next byte is the type field length */ |
| prev_type_len = *pp++; |
| |
| /* Skip the payload length */ |
| if (*p_rec & NDEF_SR_MASK) |
| pp += 1; |
| else |
| pp += 4; |
| |
| if (*p_rec & NDEF_IL_MASK) |
| pp++; |
| |
| /* Save pointer to the start of the type field */ |
| p_prev_type = pp; |
| |
| if (new_type_len > prev_type_len) |
| { |
| /* New type is larger than the previous */ |
| typelen_delta = new_type_len - prev_type_len; |
| |
| if ((*p_cur_size + typelen_delta) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* Point to the end of the previous type, and make space for the extra data */ |
| pp = p_prev_type + prev_type_len; |
| shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), typelen_delta); |
| |
| *p_cur_size += typelen_delta; |
| } |
| else if (new_type_len < prev_type_len) |
| { |
| /* New type field is smaller than the previous */ |
| typelen_delta = prev_type_len - new_type_len; |
| |
| /* Point to the end of the previous type, and shift up to fill the the unused space */ |
| pp = p_prev_type + prev_type_len; |
| shiftup (pp - typelen_delta, pp, (UINT32)(*p_cur_size - (pp - p_msg))); |
| |
| *p_cur_size -= typelen_delta; |
| } |
| |
| /* Save in new type length */ |
| p_rec[1] = new_type_len; |
| |
| /* Now copy in the new type field data */ |
| if (p_new_type) |
| memcpy (p_prev_type, p_new_type, new_type_len); |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgReplaceId |
| ** |
| ** Description This function replaces the ID field of a specific record in the |
| ** given NDEF message |
| ** |
| ** Returns OK, or error if the new ID field did not fit |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgReplaceId (UINT8 *p_msg, UINT32 max_size, UINT32 *p_cur_size, |
| UINT8 *p_rec, UINT8 *p_new_id, UINT8 new_id_len) |
| { |
| UINT8 idlen_delta; |
| UINT8 *p_prev_id, *p_idlen_field; |
| UINT8 prev_id_len, type_len; |
| UINT8 *pp; |
| |
| /* Skip header */ |
| pp = p_rec + 1; |
| |
| /* Next byte is the type field length */ |
| type_len = *pp++; |
| |
| /* Skip the payload length */ |
| if (*p_rec & NDEF_SR_MASK) |
| pp += 1; |
| else |
| pp += 4; |
| |
| p_idlen_field = pp; |
| |
| if (*p_rec & NDEF_IL_MASK) |
| prev_id_len = *pp++; |
| else |
| prev_id_len = 0; |
| |
| /* Save pointer to the start of the ID field (right after the type field) */ |
| p_prev_id = pp + type_len; |
| |
| if (new_id_len > prev_id_len) |
| { |
| /* New ID field is larger than the previous */ |
| idlen_delta = new_id_len - prev_id_len; |
| |
| /* If the previous ID length was 0, we need to add a 1-byte ID length */ |
| if (prev_id_len == 0) |
| { |
| if ((*p_cur_size + idlen_delta + 1) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| shiftdown (p_idlen_field, (UINT32)(*p_cur_size - (p_idlen_field - p_msg)), 1); |
| p_prev_id += 1; |
| *p_cur_size += 1; |
| *p_rec |= NDEF_IL_MASK; |
| } |
| else if ((*p_cur_size + idlen_delta) > max_size) |
| return (NDEF_MSG_INSUFFICIENT_MEM); |
| |
| /* Point to the end of the previous ID field, and make space for the extra data */ |
| pp = p_prev_id + prev_id_len; |
| shiftdown (pp, (UINT32)(*p_cur_size - (pp - p_msg)), idlen_delta); |
| |
| *p_cur_size += idlen_delta; |
| } |
| else if (new_id_len < prev_id_len) |
| { |
| /* New ID field is smaller than the previous */ |
| idlen_delta = prev_id_len - new_id_len; |
| |
| /* Point to the end of the previous ID, and shift up to fill the the unused space */ |
| pp = p_prev_id + prev_id_len; |
| shiftup (pp - idlen_delta, pp, (UINT32)(*p_cur_size - (pp - p_msg))); |
| |
| *p_cur_size -= idlen_delta; |
| |
| /* If removing the ID, make sure that length field is also removed */ |
| if (new_id_len == 0) |
| { |
| shiftup (p_idlen_field, p_idlen_field + 1, (UINT32)(*p_cur_size - (p_idlen_field - p_msg - (UINT32)1))); |
| *p_rec &= ~NDEF_IL_MASK; |
| *p_cur_size -= 1; |
| } |
| } |
| |
| /* Save in new ID length and data */ |
| if (new_id_len) |
| { |
| *p_idlen_field = new_id_len; |
| |
| if (p_new_id) |
| memcpy (p_prev_id, p_new_id, new_id_len); |
| } |
| |
| return (NDEF_OK); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgRemoveRec |
| ** |
| ** Description This function removes the record at the given |
| ** index in the given NDEF message. |
| ** |
| ** Returns TRUE if OK, FALSE if the index was invalid |
| ** *p_cur_size is updated |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgRemoveRec (UINT8 *p_msg, UINT32 *p_cur_size, INT32 index) |
| { |
| UINT8 *p_rec = NDEF_MsgGetRecByIndex (p_msg, index); |
| UINT8 *pNext, *pPrev; |
| |
| if (!p_rec) |
| return (NDEF_REC_NOT_FOUND); |
| |
| /* If this is the first record in the message... */ |
| if (*p_rec & NDEF_MB_MASK) |
| { |
| /* Find the second record (if any) and set his 'Message Begin' bit */ |
| if ((pNext = NDEF_MsgGetRecByIndex(p_msg, 1)) != NULL) |
| { |
| *pNext |= NDEF_MB_MASK; |
| |
| *p_cur_size -= (UINT32)(pNext - p_msg); |
| |
| shiftup (p_msg, pNext, *p_cur_size); |
| } |
| else |
| *p_cur_size = 0; /* No more records, lenght must be zero */ |
| |
| return (NDEF_OK); |
| } |
| |
| /* If this is the last record in the message... */ |
| if (*p_rec & NDEF_ME_MASK) |
| { |
| if (index > 0) |
| { |
| /* Find the previous record and set his 'Message End' bit */ |
| if ((pPrev = NDEF_MsgGetRecByIndex(p_msg, index - 1)) == NULL) |
| return (FALSE); |
| |
| *pPrev |= NDEF_ME_MASK; |
| } |
| *p_cur_size = (UINT32)(p_rec - p_msg); |
| |
| return (NDEF_OK); |
| } |
| |
| /* Not the first or the last... get the address of the next record */ |
| if ((pNext = NDEF_MsgGetNextRec (p_rec)) == NULL) |
| return (FALSE); |
| |
| /* We are removing p_rec, so shift from pNext to the end */ |
| shiftup (p_rec, pNext, (UINT32)(*p_cur_size - (pNext - p_msg))); |
| |
| *p_cur_size -= (UINT32)(pNext - p_rec); |
| |
| return (NDEF_OK); |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function NDEF_MsgCopyAndDechunk |
| ** |
| ** Description This function copies and de-chunks an NDEF message. |
| ** It is assumed that the destination is at least as large |
| ** as the source, since the source may not actually contain |
| ** any chunks. |
| ** |
| ** Returns The output byte count |
| ** |
| *******************************************************************************/ |
| tNDEF_STATUS NDEF_MsgCopyAndDechunk (UINT8 *p_src, UINT32 src_len, UINT8 *p_dest, UINT32 *p_out_len) |
| { |
| UINT32 out_len, max_out_len; |
| UINT8 *p_rec; |
| UINT8 *p_prev_rec = p_dest; |
| UINT8 *p_type, *p_id, *p_pay; |
| UINT8 type_len, id_len, tnf; |
| UINT32 pay_len; |
| tNDEF_STATUS status; |
| |
| /* First, validate the source */ |
| if ((status = NDEF_MsgValidate(p_src, src_len, TRUE)) != NDEF_OK) |
| return (status); |
| |
| /* The output buffer must be at least as large as the input buffer */ |
| max_out_len = src_len; |
| |
| /* Initialize output */ |
| NDEF_MsgInit (p_dest, max_out_len, &out_len); |
| |
| p_rec = p_src; |
| |
| /* Now, copy record by record */ |
| while (p_rec != NULL) |
| { |
| p_type = NDEF_RecGetType (p_rec, &tnf, &type_len); |
| p_id = NDEF_RecGetId (p_rec, &id_len); |
| p_pay = NDEF_RecGetPayload (p_rec, &pay_len); |
| |
| /* If this is the continuation of a chunk, append the payload to the previous */ |
| if (tnf == NDEF_TNF_UNCHANGED) |
| { |
| NDEF_MsgAppendPayload (p_dest, max_out_len, &out_len, p_prev_rec, p_pay, pay_len); |
| } |
| else |
| { |
| p_prev_rec = p_dest + out_len; |
| |
| NDEF_MsgAddRec (p_dest, max_out_len, &out_len, tnf, p_type, type_len, |
| p_id, id_len, p_pay, pay_len); |
| } |
| |
| p_rec = NDEF_MsgGetNextRec (p_rec); |
| } |
| |
| *p_out_len = out_len; |
| |
| return (NDEF_OK); |
| } |
| |
