src/nfc/tags/rw_t2t_ndef.c

/******************************************************************************
 *
 *  Copyright (C) 2010-2013 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 the implementation for Type 2 tag NDEF operation in
 *  Reader/Writer mode.
 *
 ******************************************************************************/
#include <string.h>
#include "nfc_target.h"

#if (NFC_INCLUDED == TRUE)
#include "nfc_api.h"
#include "nci_hmsgs.h"
#include "rw_api.h"
#include "rw_int.h"
#include "nfc_int.h"
#include "gki.h"

#if (defined (RW_NDEF_INCLUDED) && (RW_NDEF_INCLUDED == TRUE))

/* Local static functions */
static void rw_t2t_handle_cc_read_rsp (void);
static void rw_t2t_handle_lock_read_rsp (UINT8 *p_data);
static void rw_t2t_handle_tlv_detect_rsp (UINT8 *p_data);
static void rw_t2t_handle_ndef_read_rsp (UINT8 *p_data);
static void rw_t2t_handle_ndef_write_rsp (UINT8 *p_data);
static void rw_t2t_handle_format_tag_rsp (UINT8 *p_data);
static void rw_t2t_handle_config_tag_readonly (UINT8 *p_data);
static UINT8 rw_t2t_get_tag_size (UINT8 *p_data);
static void rw_t2t_extract_default_locks_info (void);
static void rw_t2t_update_cb (UINT16 block, UINT8 *p_write_block, BOOLEAN b_update_len);
static UINT8 rw_t2t_get_ndef_flags (void);
static UINT16 rw_t2t_get_ndef_max_size (void);
static tNFC_STATUS rw_t2t_read_locks (void);
static tNFC_STATUS rw_t2t_read_ndef_last_block (void);
static void rw_t2t_update_attributes (void);
static void rw_t2t_update_lock_attributes (void);
static BOOLEAN rw_t2t_is_lock_res_byte (UINT16 index);
static BOOLEAN rw_t2t_is_read_only_byte (UINT16 index);
static tNFC_STATUS rw_t2t_write_ndef_first_block (UINT16 msg_len, BOOLEAN b_update_len);
static tNFC_STATUS rw_t2t_write_ndef_next_block (UINT16 block, UINT16 msg_len, BOOLEAN b_update_len);
static tNFC_STATUS rw_t2t_read_ndef_next_block (UINT16 block);
static tNFC_STATUS rw_t2t_add_terminator_tlv (void);
static BOOLEAN rw_t2t_is_read_before_write_block (UINT16 block, UINT16 *p_block_to_read);
static tNFC_STATUS rw_t2t_set_cc (UINT8 tms);
static tNFC_STATUS rw_t2t_set_lock_tlv (UINT16 addr, UINT8 num_dyn_lock_bits, UINT16 locked_area_size);
static tNFC_STATUS rw_t2t_format_tag (void);
static tNFC_STATUS rw_t2t_soft_lock_tag (void);
static tNFC_STATUS rw_t2t_set_dynamic_lock_bits (UINT8 *p_data);
static void rw_t2t_ntf_tlv_detect_complete (tNFC_STATUS status);

const UINT8 rw_t2t_mask_bits[8] =
{0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};

/*******************************************************************************
**
** Function         rw_t2t_handle_rsp
**
** Description      This function handles response to command sent during
**                  NDEF and other tlv operation
**
** Returns          None
**
*******************************************************************************/
void rw_t2t_handle_rsp (UINT8 *p_data)
{
    tRW_T2T_CB  *p_t2t  = &rw_cb.tcb.t2t;

    if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_READ_CC)
    {
        p_t2t->b_read_hdr = TRUE;
        memcpy (p_t2t->tag_hdr,  p_data, T2T_READ_DATA_LEN);
    }

    switch (p_t2t->state)
    {
    case RW_T2T_STATE_DETECT_TLV:
        if (p_t2t->tlv_detect == TAG_LOCK_CTRL_TLV)
        {
            if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_READ_CC)
            {
                rw_t2t_handle_cc_read_rsp ();
            }
            else if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_READ_LOCKS)
            {
                rw_t2t_handle_lock_read_rsp (p_data);
            }
            else
            {
                rw_t2t_handle_tlv_detect_rsp (p_data);
            }
        }
        else if (p_t2t->tlv_detect == TAG_NDEF_TLV)
        {
            if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_READ_CC)
            {
                if (p_t2t->tag_hdr[T2T_CC0_NMN_BYTE] == T2T_CC0_NMN)
                {
                    rw_t2t_handle_cc_read_rsp ();
                }
                else
                {
                    RW_TRACE_WARNING3 ("NDEF Detection failed!, CC[0]: 0x%02x, CC[1]: 0x%02x, CC[3]: 0x%02x", p_t2t->tag_hdr[T2T_CC0_NMN_BYTE], p_t2t->tag_hdr[T2T_CC1_VNO_BYTE], p_t2t->tag_hdr[T2T_CC3_RWA_BYTE]);
                    rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_FAILED);
                }
            }
            else if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_READ_LOCKS)
            {
                rw_t2t_handle_lock_read_rsp (p_data);
            }
            else
            {
                rw_t2t_handle_tlv_detect_rsp (p_data);
            }
        }
        else
        {
            if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_READ_CC)
            {
                rw_t2t_handle_cc_read_rsp ();
            }
            else
            {
                rw_t2t_handle_tlv_detect_rsp (p_data);
            }
        }
        break;

    case RW_T2T_STATE_SET_TAG_RO:
        rw_t2t_handle_config_tag_readonly (p_data);
        break;

    case RW_T2T_STATE_FORMAT_TAG:
        rw_t2t_handle_format_tag_rsp (p_data);
        break;

    case RW_T2T_STATE_READ_NDEF:
        rw_t2t_handle_ndef_read_rsp (p_data);
        break;

    case RW_T2T_STATE_WRITE_NDEF:
        rw_t2t_handle_ndef_write_rsp (p_data);
        break;
    }
}

/*******************************************************************************
**
** Function         rw_t2t_info_to_event
**
** Description      This function returns RW event code based on the current state
**
** Returns          RW event code
**
*******************************************************************************/
tRW_EVENT rw_t2t_info_to_event (const tT2T_CMD_RSP_INFO *p_info)
{
    tRW_EVENT   rw_event;
    tRW_T2T_CB  *p_t2t  = &rw_cb.tcb.t2t;

    switch (p_t2t->state)
    {
    case RW_T2T_STATE_DETECT_TLV:
        if (p_t2t->tlv_detect == TAG_NDEF_TLV)
            rw_event = RW_T2T_NDEF_DETECT_EVT;
        else
            rw_event = RW_T2T_TLV_DETECT_EVT;

        break;

    case RW_T2T_STATE_READ_NDEF:
        rw_event = RW_T2T_NDEF_READ_EVT;
        break;

    case RW_T2T_STATE_WRITE_NDEF:
        rw_event = RW_T2T_NDEF_WRITE_EVT;
        break;

    case RW_T2T_STATE_SET_TAG_RO:
        rw_event = RW_T2T_SET_TAG_RO_EVT;
        break;

    case RW_T2T_STATE_CHECK_PRESENCE:
        rw_event = RW_T2T_PRESENCE_CHECK_EVT;
        break;

    case RW_T2T_STATE_FORMAT_TAG:
        rw_event = RW_T2T_FORMAT_CPLT_EVT;
        break;

    default:
	    rw_event = t2t_info_to_evt (p_info);
        break;
    }
    return rw_event;
}

/*******************************************************************************
**
** Function         rw_t2t_handle_cc_read_rsp
**
** Description      Handle read cc bytes
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_cc_read_rsp (void)
{
    tRW_T2T_CB              *p_t2t  = &rw_cb.tcb.t2t;

    if (  (  (p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] != T2T_CC3_RWA_RW)
           &&(p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] != T2T_CC3_RWA_RO)  )
                                    ||
          (  (p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != T2T_CC1_LEGACY_VNO)
           &&(p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != T2T_CC1_VNO)
           &&(p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != T2T_CC1_NEW_VNO)  )  )
    {
        /* Invalid Version number or RWA byte */
        rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_FAILED);
        return;
    }

    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;

    if (rw_t2t_read ((UINT16) T2T_FIRST_DATA_BLOCK) != NFC_STATUS_OK)
    {
        rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_FAILED);
    }
}

/*******************************************************************************
**
** Function         rw_t2t_ntf_tlv_detect_complete
**
** Description      Notify TLV detection complete to upper layer
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_ntf_tlv_detect_complete (tNFC_STATUS status)
{
    tRW_T2T_CB              *p_t2t  = &rw_cb.tcb.t2t;
    tRW_DETECT_NDEF_DATA    ndef_data = {0};
    tRW_DETECT_TLV_DATA     tlv_data;
    tRW_T2T_DETECT          evt_data;
    UINT8                   xx;

    if (p_t2t->tlv_detect == TAG_NDEF_TLV)
    {
        /* Notify upper layer the result of NDEF detect op */
        ndef_data.status    = status;
        ndef_data.protocol  = NFC_PROTOCOL_T2T;
        ndef_data.flags     = rw_t2t_get_ndef_flags ();
        ndef_data.cur_size  = p_t2t->ndef_msg_len;

        if (status == NFC_STATUS_OK)
            ndef_data.flags   |= RW_NDEF_FL_FORMATED;

        if (p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] == T2T_CC3_RWA_RW)
            ndef_data.max_size = (UINT32) rw_t2t_get_ndef_max_size ();
        else
            ndef_data.max_size = ndef_data.cur_size;

        if (ndef_data.max_size < ndef_data.cur_size)
        {
            ndef_data.flags   |= RW_NDEF_FL_READ_ONLY;
            ndef_data.max_size = ndef_data.cur_size;
        }

        if (!(ndef_data.flags & RW_NDEF_FL_READ_ONLY))
        {
            ndef_data.flags  |= RW_NDEF_FL_SOFT_LOCKABLE;
            if (status == NFC_STATUS_OK)
                ndef_data.flags |= RW_NDEF_FL_HARD_LOCKABLE;
        }

        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_NDEF_DETECT_EVT, (tRW_DATA *) &ndef_data);
    }
    else if (p_t2t->tlv_detect == TAG_PROPRIETARY_TLV)
    {
        evt_data.msg_len = p_t2t->prop_msg_len;
        evt_data.status  = status;
        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_TLV_DETECT_EVT, (tRW_DATA *) &evt_data);
    }
    else
    {
        /* Notify upper layer the result of Lock/Mem TLV detect op */
        tlv_data.protocol   = NFC_PROTOCOL_T2T;
        if (p_t2t->tlv_detect == TAG_LOCK_CTRL_TLV)
        {
            tlv_data.num_bytes  = p_t2t->num_lockbytes;
        }
        else
        {
            tlv_data.num_bytes = 0;
            for (xx = 0; xx < p_t2t->num_mem_tlvs; xx++)
            {
                tlv_data.num_bytes += p_t2t->mem_tlv[p_t2t->num_mem_tlvs].num_bytes;
            }
        }
        tlv_data.status     = status;
        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_TLV_DETECT_EVT, (tRW_DATA *) &tlv_data);
    }

}

/*******************************************************************************
**
** Function         rw_t2t_handle_lock_read_rsp
**
** Description      Handle response to reading lock bytes
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_lock_read_rsp (UINT8 *p_data)
{
    UINT8                   updated_lock_byte;
    UINT8                   num_locks;
    UINT8                   offset = 0;
    UINT16                  lock_offset;
    UINT16                  base_lock_offset = 0;
    tRW_T2T_CB              *p_t2t  = &rw_cb.tcb.t2t;
    UINT16                  block;

    /* Prepare NDEF/TLV attributes (based on current op) for sending response to upper layer */

    num_locks = 0;
    updated_lock_byte = 0;

    /*  Extract all lock bytes present in the read 16 bytes
     *  but atleast one lock byte (base lock) should be present in the read 16 bytes */

    while (num_locks < p_t2t->num_lockbytes)
    {
        if (p_t2t->lockbyte[num_locks].b_lock_read == FALSE)
        {
            lock_offset = p_t2t->lock_tlv[p_t2t->lockbyte[num_locks].tlv_index].offset + p_t2t->lockbyte[num_locks].byte_index;
            if (updated_lock_byte == 0)
            {
                /* The offset of the first lock byte present in the 16 bytes read using READ command */
                base_lock_offset = lock_offset;
                /* Block number used to read may not be the block where lock offset is present */
                offset = (UINT8) (lock_offset - (p_t2t->block_read * T2T_BLOCK_SIZE));
                /* Update the lock byte value in the control block */
                p_t2t->lockbyte[num_locks].lock_byte = p_data[offset];
                p_t2t->lockbyte[num_locks].b_lock_read = TRUE;
                updated_lock_byte++;
            }
            else if (lock_offset > base_lock_offset)
            {
                /* Atleast one lock byte will get updated in the control block */
                if ((lock_offset - base_lock_offset + offset) < T2T_READ_DATA_LEN)
                {
                    /* And this lock byte is also present in the read data */
                    p_t2t->lockbyte[num_locks].lock_byte   = p_data[lock_offset - base_lock_offset + offset];
                    p_t2t->lockbyte[num_locks].b_lock_read = TRUE;
                    updated_lock_byte++;
                }
                else
                {
                    /* This lock byte is not present in the read data */
                    block  = (UINT16) (lock_offset / T2T_BLOCK_LEN);
                    block -= block % T2T_READ_BLOCKS;
                    /* send READ command to read this lock byte */
                    if (NFC_STATUS_OK != rw_t2t_read ((UINT16) block))
                    {
                        /* Unable to send Read command, notify failure status to upper layer */
                        rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_FAILED);
                    }
                    break;
                }
            }
            else
            {
                /* This Lock byte is not present in the read 16 bytes
                 * send READ command to read the lock byte       */
                if (NFC_STATUS_OK != rw_t2t_read ((UINT16) (lock_offset / T2T_BLOCK_LEN)))
                {
                    /* Unable to send Read command, notify failure status to upper layer */
                    rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_FAILED);
                }
                break;
            }
        }
        num_locks++;
    }
    if (num_locks == p_t2t->num_lockbytes)
    {
        /* All locks are read, notify upper layer */
        rw_t2t_update_lock_attributes ();
        rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_OK);
    }
}

/*******************************************************************************
**
** Function         rw_t2t_handle_tlv_detect_rsp
**
** Description      Handle TLV detection.
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_tlv_detect_rsp (UINT8 *p_data)
{
    tRW_T2T_CB              *p_t2t = &rw_cb.tcb.t2t;
    UINT16                  offset;
    UINT16                  len = 0;
    BOOLEAN                 failed = FALSE;
    BOOLEAN                 found  = FALSE;
    tRW_EVENT               event;
    UINT8                   index;
    UINT8                   count = 0;
    UINT8                   xx;
    tNFC_STATUS             status;
    tT2T_CMD_RSP_INFO       *p_cmd_rsp_info = (tT2T_CMD_RSP_INFO *) rw_cb.tcb.t2t.p_cmd_rsp_info;
    UINT8                   tlvtype = p_t2t->tlv_detect;

    if (p_t2t->work_offset == 0)
    {
        /* Skip UID,Static Lock block,CC*/
        p_t2t->work_offset = T2T_FIRST_DATA_BLOCK * T2T_BLOCK_LEN;
        p_t2t->b_read_data = TRUE;
        memcpy (p_t2t->tag_data,  p_data, T2T_READ_DATA_LEN);
    }

    p_t2t->segment = 0;

    for (offset = 0; offset < T2T_READ_DATA_LEN  && !failed && !found;)
    {
        if (rw_t2t_is_lock_res_byte ((UINT16) (p_t2t->work_offset + offset)) == TRUE)
        {
            /* Skip locks, reserved bytes while searching for TLV */
            offset++;
            continue;
        }
        switch (p_t2t->substate)
        {
        case RW_T2T_SUBSTATE_WAIT_TLV_DETECT:
            /* Search for the tlv */
            p_t2t->found_tlv = p_data[offset++];
            switch (p_t2t->found_tlv)
            {
            case TAG_NULL_TLV:         /* May be used for padding. SHALL ignore this */
                break;

            case TAG_NDEF_TLV:
                if (tlvtype == TAG_NDEF_TLV)
                {
                    /* NDEF Detected, now collect NDEF Attributes including NDEF Length */
                    index = (offset % T2T_BLOCK_SIZE);
                    /* Backup ndef first block */
                    memcpy (p_t2t->ndef_first_block,&p_data[offset-index],index);
                    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_FIND_LEN_FIELD_LEN;
                }
                else if (tlvtype == TAG_PROPRIETARY_TLV)
                {
                    /* Proprietary TLV can exist after NDEF Tlv so we continue searching */
                    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_FIND_LEN_FIELD_LEN;
                }
                else if (  ((tlvtype == TAG_LOCK_CTRL_TLV) && (p_t2t->num_lockbytes > 0))
                         ||((tlvtype == TAG_MEM_CTRL_TLV) && (p_t2t->num_mem_tlvs > 0))  )
                {
                    /* Lock / Memory control tlv cannot exist after NDEF TLV
                     * So when NDEF is found, we stop searching for Lock and Memory control tlv */
                    found = TRUE;
                }
                else
                {
                    /* While searching for Lock / Memory control tlv, if NDEF TLV is found
                     * first then our search for Lock /Memory control tlv failed and we stop here */
                    failed = TRUE;
                }
                break;

            case TAG_LOCK_CTRL_TLV:
            case TAG_MEM_CTRL_TLV:
                p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_TLV_LEN0;
                break;

            case TAG_PROPRIETARY_TLV:
                if (tlvtype == TAG_PROPRIETARY_TLV)
                {
                    index = (offset % T2T_BLOCK_SIZE);
                    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_FIND_LEN_FIELD_LEN;
                }
                else
                {
                    /* NDEF/LOCK/MEM TLV can exist after Proprietary Tlv so we continue searching, skiping proprietary tlv */
                    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_FIND_LEN_FIELD_LEN;
                }
                break;

            case TAG_TERMINATOR_TLV:   /* Last TLV block in the data area. Must be no NDEF nessage */
                if (  ((tlvtype == TAG_LOCK_CTRL_TLV) && (p_t2t->num_lockbytes > 0))
                    ||((tlvtype == TAG_MEM_CTRL_TLV) && (p_t2t->num_mem_tlvs > 0))  )
                {
                    /* No more Lock/Memory TLV control tlv in the tag, so stop searching */
                    found = TRUE;
                }
                else
                {
                    /* NDEF/Lock/Memory/Proprietary TLV cannot exist after Terminator Tlv */
                    failed = TRUE;
                }
                break;
            default:
                failed = TRUE;
            }
            break;

        case RW_T2T_SUBSTATE_WAIT_FIND_LEN_FIELD_LEN:
            len = p_data[offset];
            switch (p_t2t->found_tlv)
            {
            case TAG_NDEF_TLV:
                p_t2t->ndef_header_offset = offset + p_t2t->work_offset;
                if (len == TAG_LONG_NDEF_LEN_FIELD_BYTE0)
                {
                    /* The next two bytes constitute length bytes */
                    p_t2t->substate     = RW_T2T_SUBSTATE_WAIT_READ_TLV_LEN0;
                }
                else
                {
                    /* one byte length field */
                    p_t2t->ndef_msg_len = len;
                    p_t2t->bytes_count  = p_t2t->ndef_msg_len;
                    p_t2t->substate     = RW_T2T_SUBSTATE_WAIT_READ_TLV_VALUE;
                }
                break;

            case TAG_PROPRIETARY_TLV:
                if (len == T2T_LONG_NDEF_LEN_FIELD_BYTE0)
                {
                    /* The next two bytes constitute length bytes */
                    p_t2t->substate     = RW_T2T_SUBSTATE_WAIT_READ_TLV_LEN0;
                }
                else
                {
                    /* one byte length field */
                    p_t2t->prop_msg_len = len;
                    p_t2t->bytes_count  = p_t2t->prop_msg_len;
                    p_t2t->substate     = RW_T2T_SUBSTATE_WAIT_READ_TLV_VALUE;
                }
                break;
            }
            offset++;
            break;

        case RW_T2T_SUBSTATE_WAIT_READ_TLV_LEN0:
            switch (p_t2t->found_tlv)
            {
            case TAG_LOCK_CTRL_TLV:
            case TAG_MEM_CTRL_TLV:

                len = p_data[offset];
                if (len == TAG_DEFAULT_TLV_LEN)
                {
                    /* Valid Lock control TLV */
                    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_TLV_VALUE;
                    p_t2t->bytes_count = TAG_DEFAULT_TLV_LEN;
                }
                else if (  ((tlvtype == TAG_LOCK_CTRL_TLV) && (p_t2t->num_lockbytes > 0))
                         ||((tlvtype == TAG_MEM_CTRL_TLV) && (p_t2t->num_mem_tlvs > 0))  )
                {
                    /* Stop searching for Lock/ Memory control tlv */
                    found = TRUE;
                }
                else
                {
                    failed = TRUE;
                }
                break;

            case TAG_NDEF_TLV:
            case TAG_PROPRIETARY_TLV:
                /* The first length byte */
                p_t2t->bytes_count  = (UINT8) p_data[offset];
                p_t2t->substate     = RW_T2T_SUBSTATE_WAIT_READ_TLV_LEN1;
                break;
            }
            offset++;
            break;

        case RW_T2T_SUBSTATE_WAIT_READ_TLV_LEN1:
            /* Prepare NDEF Message length */
            p_t2t->bytes_count  = (p_t2t->bytes_count << 8) + p_data[offset];
            if (p_t2t->found_tlv == TAG_NDEF_TLV)
            {
                p_t2t->ndef_msg_len = p_t2t->bytes_count;
            }
            else if (p_t2t->found_tlv == TAG_PROPRIETARY_TLV)
            {
                p_t2t->prop_msg_len = p_t2t->bytes_count;
            }
            p_t2t->substate     = RW_T2T_SUBSTATE_WAIT_READ_TLV_VALUE;
            offset++;
            break;

        case RW_T2T_SUBSTATE_WAIT_READ_TLV_VALUE:
            switch (p_t2t->found_tlv)
            {
            case TAG_NDEF_TLV:
                if (  (p_t2t->bytes_count == p_t2t->ndef_msg_len)
                    &&(tlvtype == TAG_NDEF_TLV)  )
                {
                    /* The first byte offset after length field */
                    p_t2t->ndef_msg_offset = offset + p_t2t->work_offset;
                }
                /* Reduce number of NDEF bytes remaining to pass over NDEF TLV */
                if (p_t2t->bytes_count > 0)
                    p_t2t->bytes_count--;

                if (tlvtype == TAG_NDEF_TLV)
                {
                    found = TRUE;
                    p_t2t->ndef_status = T2T_NDEF_DETECTED;
                }
                else if (p_t2t->bytes_count == 0)
                {
                    /* Next byte could be a different TLV */
                    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
                }
                break;

            case TAG_LOCK_CTRL_TLV:
                p_t2t->bytes_count--;
                if (  (tlvtype == TAG_LOCK_CTRL_TLV)
                    ||(tlvtype == TAG_NDEF_TLV)  )
                {
                    /* Collect Lock TLV */
                    p_t2t->tlv_value[2 - p_t2t->bytes_count] = p_data[offset];
                    if (p_t2t->bytes_count == 0)
                    {
                        /* Lock TLV is collected and buffered in tlv_value, now decode it */
                        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].offset   = (p_t2t->tlv_value[0] >> 4) & 0x0F;
                        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].offset  *= (UINT8) tags_pow (2, p_t2t->tlv_value[2] & 0x0F);
                        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].offset  += p_t2t->tlv_value[0] & 0x0F;
                        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].bytes_locked_per_bit = (UINT8) tags_pow (2, ((p_t2t->tlv_value[2] & 0xF0) >> 4));
                        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].num_bits = p_t2t->tlv_value[1];
                        count = p_t2t->tlv_value[1] / 8 + ((p_t2t->tlv_value[1]%8 != 0)? 1:0);

                        /* Extract lockbytes info addressed by this Lock TLV */
                        xx = 0;
                        while (xx < count)
                        {
                            p_t2t->lockbyte[p_t2t->num_lockbytes].tlv_index     = p_t2t->num_lock_tlvs;
                            p_t2t->lockbyte[p_t2t->num_lockbytes].byte_index    = xx;
                            p_t2t->lockbyte[p_t2t->num_lockbytes].b_lock_read   = FALSE;
                            xx++;
                            p_t2t->num_lockbytes++;
                        }
                        p_t2t->num_lock_tlvs++;
                        rw_t2t_update_attributes ();
                        /* Next byte could be a different TLV */
                        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
                    }
                }
                else
                {
                    /* If not looking for lock/ndef tlv, just skip this Lock TLV */
                    if (p_t2t->bytes_count == 0)
                    {
                        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
                    }
                }
                break;

            case TAG_MEM_CTRL_TLV:
                p_t2t->bytes_count--;
                if (  (tlvtype == TAG_MEM_CTRL_TLV)
                    ||(tlvtype == TAG_NDEF_TLV)  )
                {
                    p_t2t->tlv_value[2 - p_t2t->bytes_count] = p_data[offset];
                    if (p_t2t->bytes_count == 0)
                    {
                        if (p_t2t->num_mem_tlvs >= RW_T2T_MAX_MEM_TLVS)
                        {
                            RW_TRACE_ERROR0 ("rw_t2t_handle_tlv_detect_rsp - Maximum buffer allocated for Memory tlv has reached");
                            failed  = TRUE;
                        }
                        else
                        {
                            /* Extract memory control tlv */
                            p_t2t->mem_tlv[p_t2t->num_mem_tlvs].offset    = (p_t2t->tlv_value[0] >> 4) & 0x0F;
                            p_t2t->mem_tlv[p_t2t->num_mem_tlvs].offset   *= (UINT8) tags_pow (2, p_t2t->tlv_value[2] & 0x0F);
                            p_t2t->mem_tlv[p_t2t->num_mem_tlvs].offset   += p_t2t->tlv_value[0] & 0x0F;
                            p_t2t->mem_tlv[p_t2t->num_mem_tlvs].num_bytes = p_t2t->tlv_value[1];
                            p_t2t->num_mem_tlvs++;
                            rw_t2t_update_attributes ();
                            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
                        }
                    }
                }
                else
                {
                    if (p_t2t->bytes_count == 0)
                    {
                        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
                    }
                }
                break;

            case TAG_PROPRIETARY_TLV:
                p_t2t->bytes_count--;
                if (tlvtype == TAG_PROPRIETARY_TLV)
                {
                    found = TRUE;
                    p_t2t->prop_msg_len = len;
                }
                else
                {
                    if (p_t2t->bytes_count == 0)
                    {
                        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
                    }
                }
                break;
            }
            offset++;
            break;
        }
    }


    p_t2t->work_offset += T2T_READ_DATA_LEN;

    event = rw_t2t_info_to_event (p_cmd_rsp_info);

    /* If not found and not failed, read next block and search tlv */
    if (!found && !failed)
    {

        if (p_t2t->work_offset >= (p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] * T2T_TMS_TAG_FACTOR))
        {
            if (  ((tlvtype == TAG_LOCK_CTRL_TLV) && (p_t2t->num_lockbytes > 0))
                ||((tlvtype == TAG_MEM_CTRL_TLV) && (p_t2t->num_mem_tlvs > 0))  )
            {
                found = TRUE;
            }
            else
            {
                failed = TRUE;
            }
        }
        else
        {
            if (rw_t2t_read ((UINT16) ((p_t2t->work_offset / T2T_BLOCK_LEN) + T2T_FIRST_DATA_BLOCK)) != NFC_STATUS_OK)
                failed = TRUE;
        }
    }

    if (failed || found)
    {
        if (tlvtype == TAG_LOCK_CTRL_TLV)
        {
            /* Incase no Lock control tlv is present then look for default dynamic lock bytes */
            rw_t2t_extract_default_locks_info ();

            /* Send command to read the dynamic lock bytes */
            status = rw_t2t_read_locks ();

            if (status != NFC_STATUS_CONTINUE)
            {
                /* If unable to read a lock/all locks read, notify upper layer */
                rw_t2t_update_lock_attributes ();
                rw_t2t_ntf_tlv_detect_complete (status);
            }
        }
        else if (tlvtype == TAG_NDEF_TLV)
        {
            rw_t2t_extract_default_locks_info ();

            if (failed)
            {
                rw_t2t_ntf_tlv_detect_complete (NFC_STATUS_FAILED);
            }
            else
            {
                /* NDEF present,Send command to read the dynamic lock bytes */
                status = rw_t2t_read_locks ();
                if (status != NFC_STATUS_CONTINUE)
                {
                    /* If unable to read a lock/all locks read, notify upper layer */
                    rw_t2t_update_lock_attributes ();
                    rw_t2t_ntf_tlv_detect_complete (status);
                }
            }
        }
        else
        {
            /* Notify Memory/ Proprietary tlv detect result */
            status  = failed ? NFC_STATUS_FAILED : NFC_STATUS_OK;
            rw_t2t_ntf_tlv_detect_complete (status);
        }
    }
}

/*******************************************************************************
**
** Function         rw_t2t_read_locks
**
** Description      This function will send command to read next unread locks
**
** Returns          NFC_STATUS_OK, if all locks are read successfully
**                  NFC_STATUS_FAILED, if reading locks failed
**                  NFC_STATUS_CONTINUE, if reading locks is in progress
**
*******************************************************************************/
tNFC_STATUS rw_t2t_read_locks (void)
{
    UINT8       num_locks   = 0;
    tRW_T2T_CB  *p_t2t      = &rw_cb.tcb.t2t;
    tNFC_STATUS status      = NFC_STATUS_CONTINUE;
    UINT16      offset;
    UINT16      block;

    if (  (p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] != T2T_CC3_RWA_RW)
        ||(p_t2t->skip_dyn_locks)  )
    {
        /* Skip reading dynamic lock bytes if CC is set as Read only or layer above instructs to skip */
        while (num_locks < p_t2t->num_lockbytes)
        {
            p_t2t->lockbyte[num_locks].lock_byte   = 0x00;
            p_t2t->lockbyte[num_locks].b_lock_read = TRUE;
            num_locks++;
        }
    }

    while (num_locks < p_t2t->num_lockbytes)
    {
        if (p_t2t->lockbyte[num_locks].b_lock_read == FALSE)
        {
            /* Send Read command to read the first un read locks */
            offset = p_t2t->lock_tlv[p_t2t->lockbyte[num_locks].tlv_index].offset + p_t2t->lockbyte[num_locks].byte_index;

            /* Read 16 bytes where this lock byte is present */
            block  = (UINT16) (offset / T2T_BLOCK_LEN);
            block -= block % T2T_READ_BLOCKS;

            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_LOCKS;
            /* send READ8 command */
            if ((status = rw_t2t_read ((UINT16) block)) == NFC_STATUS_OK)
            {
                /* Reading Locks */
                status          = NFC_STATUS_CONTINUE;
            }
            else
            {
                status = NFC_STATUS_FAILED;
            }
            break;
        }
        num_locks++;
    }
    if (num_locks == p_t2t->num_lockbytes)
    {
        /* All locks are read */
        status = NFC_STATUS_OK;
    }

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_extract_default_locks_info
**
** Description      This function will prepare lockbytes information for default
**                  locks present in the tag in the absence of lock control tlv.
**                  Adding a virtual lock control tlv for these lock bytes for
**                  easier manipulation.
**
** Returns          None
**
*******************************************************************************/
void rw_t2t_extract_default_locks_info (void)
{
    UINT8       num_dynamic_lock_bits;
    UINT8       num_dynamic_lock_bytes;
    UINT8       xx;
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    const       tT2T_INIT_TAG *p_ret;
    UINT8       bytes_locked_per_lock_bit = T2T_DEFAULT_LOCK_BLPB;


    if (  (p_t2t->num_lock_tlvs == 0)
        &&(p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] > T2T_CC2_TMS_STATIC)  )
    {
        /* No Lock control tlv is detected. Indicates lock bytes are present in default location */
        /* Add a virtual Lock tlv to map this default lock location */
        if ((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], FALSE, 0)) != NULL)
            bytes_locked_per_lock_bit = p_ret->default_lock_blpb;

        num_dynamic_lock_bits   = ((p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] * T2T_TMS_TAG_FACTOR) - (T2T_STATIC_SIZE - T2T_HEADER_SIZE)) / bytes_locked_per_lock_bit;
        num_dynamic_lock_bytes  = num_dynamic_lock_bits / 8;
        num_dynamic_lock_bytes += (num_dynamic_lock_bits % 8 == 0) ? 0:1;

        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].offset                = (p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] * T2T_TMS_TAG_FACTOR) + (T2T_FIRST_DATA_BLOCK * T2T_BLOCK_LEN);
        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].bytes_locked_per_bit  = bytes_locked_per_lock_bit;
        p_t2t->lock_tlv[p_t2t->num_lock_tlvs].num_bits              = num_dynamic_lock_bits;

        /* Based on tag data size the number of locks present in the default location changes */
        for (xx = 0; xx < num_dynamic_lock_bytes; xx++)
        {
            p_t2t->lockbyte[xx].tlv_index   = p_t2t->num_lock_tlvs;
            p_t2t->lockbyte[xx].byte_index  = xx;
            p_t2t->lockbyte[xx].b_lock_read = FALSE;
        }
        p_t2t->num_lockbytes = num_dynamic_lock_bytes;
        p_t2t->num_lock_tlvs = 1;
    }
}

/*******************************************************************************
**
** Function         rw_t2t_read_ndef_last_block
**
** Description      This function will locate and read the last ndef block.
**                  The last ndef block refers to the tag block where last byte
**                  of new ndef message will reside. Also this function will
**                  locate the offset of Terminator TLV based on the size of
**                  new NDEF Message
**
** Returns          NCI_STATUS_OK,if able to locate last ndef block & read started
**                  Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS rw_t2t_read_ndef_last_block (void)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    UINT16      header_len = (p_t2t->new_ndef_msg_len >= T2T_LONG_NDEF_MIN_LEN) ? T2T_LONG_NDEF_LEN_FIELD_LEN : T2T_SHORT_NDEF_LEN_FIELD_LEN;
    UINT16      num_ndef_bytes;
    UINT16      total_ndef_bytes;
    UINT16      last_ndef_byte_offset;
    UINT16      terminator_tlv_byte_index;
    tNFC_STATUS status;
    UINT16      block;


    total_ndef_bytes        = header_len + p_t2t->new_ndef_msg_len;
    num_ndef_bytes          = 0;
    last_ndef_byte_offset   = p_t2t->ndef_header_offset;

    /* Locate NDEF final block based on the size of new NDEF Message */
    while (num_ndef_bytes < total_ndef_bytes)
    {
        if (rw_t2t_is_lock_res_byte ((UINT16) (last_ndef_byte_offset)) == FALSE)
            num_ndef_bytes++;

        last_ndef_byte_offset++;
    }
    p_t2t->ndef_last_block_num = (UINT16) ((last_ndef_byte_offset - 1) / T2T_BLOCK_SIZE);
    block  = p_t2t->ndef_last_block_num;

    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_NDEF_LAST_BLOCK;
    /* Read NDEF last block before updating */
    if ((status = rw_t2t_read (block))== NFC_STATUS_OK)
    {
        if ((p_t2t->new_ndef_msg_len + 1) <= p_t2t->max_ndef_msg_len)
        {
            /* Locate Terminator TLV Block */
            total_ndef_bytes++;
            terminator_tlv_byte_index = last_ndef_byte_offset;

            while (num_ndef_bytes < total_ndef_bytes)
            {
                if (rw_t2t_is_lock_res_byte ((UINT16) terminator_tlv_byte_index) == FALSE)
                        num_ndef_bytes++;

                terminator_tlv_byte_index++;
            }

            p_t2t->terminator_byte_index = terminator_tlv_byte_index - 1;
        }
        else
        {
            /* No space for Terminator TLV */
            p_t2t->terminator_byte_index = 0x00;
        }
    }
    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_read_terminator_tlv_block
**
** Description      This function will read the block where terminator tlv will
**                  be added later
**
** Returns          NCI_STATUS_OK, if read was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS rw_t2t_read_terminator_tlv_block (void)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status;
    UINT16      block;

    /* Send read command to read base block (Block % 4==0) where this block is also read as part of 16 bytes */
    block  = p_t2t->terminator_byte_index / T2T_BLOCK_SIZE;
    block -= block % T2T_READ_BLOCKS;

    p_t2t->substate         = RW_T2T_SUBSTATE_WAIT_READ_TERM_TLV_BLOCK;
    /* Read the block where Terminator TLV may be added later during NDEF Write operation */
    status = rw_t2t_read (block);
    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_read_ndef_next_block
**
** Description      This function will read the tag block passed as argument
**
** Returns          NCI_STATUS_OK, if read was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS rw_t2t_read_ndef_next_block (UINT16 block)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status;

    /* Send read command to read base block (Block % 4==0) where this block is also read as part of 16 bytes */
    block -= block % T2T_READ_BLOCKS;

    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_NDEF_NEXT_BLOCK;
    /* Read the block */
    status = rw_t2t_read (block);

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_is_read_before_write_block
**
** Description      This function will check if the block has to be read before
**                  writting to avoid over writting in to lock/reserved bytes
**                  present in the block.
**                  If no bytes in the block can be overwritten it moves in to
**                  next block and check. Finally it finds a block where part of
**                  ndef bytes can exist and check if the whole block can be
**                  updated or only part of block can be modified.
**
** Returns          TRUE, if the block returned should be read before writting
**                  FALSE, if the block need not be read as it was already
**                         read or during NDEF write we may completely overwrite
**                         the block and there is no reserved or locked bytes in
**                         that block
**
*******************************************************************************/
static BOOLEAN rw_t2t_is_read_before_write_block (UINT16 block, UINT16 *p_block_to_read)
{
    tRW_T2T_CB  *p_t2t  = &rw_cb.tcb.t2t;
    UINT8       *p_cc   = &p_t2t->tag_hdr[T2T_CC0_NMN_BYTE];
    UINT8       count;
    UINT8       index;
    UINT16      tag_size = p_cc[2] * 2 + T2T_FIRST_DATA_BLOCK;
    BOOLEAN     read_before_write = TRUE;


    if (block == p_t2t->ndef_header_offset / T2T_BLOCK_SIZE)
    {
        /* First NDEF block is already read */
        read_before_write = FALSE;
        memcpy (p_t2t->ndef_read_block,p_t2t->ndef_first_block,T2T_BLOCK_SIZE);
    }
    else if (block == p_t2t->ndef_last_block_num)
    {
        /* Last NDEF block is already read */
        read_before_write = FALSE;
        memcpy (p_t2t->ndef_read_block,p_t2t->ndef_last_block,T2T_BLOCK_SIZE);
    }
    else if (block == p_t2t->terminator_byte_index / T2T_BLOCK_SIZE)
    {
        /* Terminator tlv block is already read */
        read_before_write = FALSE;
        memcpy (p_t2t->ndef_read_block,p_t2t->terminator_tlv_block,T2T_BLOCK_SIZE);
    }
    else
    {
        count = 0;
        while (block < tag_size)
        {
            index = 0;

            while (index < T2T_BLOCK_SIZE)
            {
                /* check if it is a reserved or locked byte */
                if (rw_t2t_is_lock_res_byte ((UINT16) ((block * T2T_BLOCK_SIZE) + index)) == FALSE)
                {
                    count++;
                }
                index++;
            }
            if (count == T2T_BLOCK_SIZE)
            {
                /* All the bytes in the block are free to NDEF write  */
                read_before_write = FALSE;
                break;
            }
            else if (count == 0)
            {
                /* The complete block is not free for NDEF write  */
                index = 0;
                block++;
            }
            else
            {
                /* The block has reseved byte (s) or locked byte (s) or both */
                read_before_write = TRUE;
                break;
            }
        }
    }
    /* Return the block to read next before NDEF write */
    *p_block_to_read = block;
    return read_before_write;
}

/*******************************************************************************
**
** Function         rw_t2t_write_ndef_first_block
**
** Description      This function will write the first NDEF block with Length
**                  field reset to zero.
**                  Also after writting NDEF this function may be called to
**                  update new NDEF length
**
** Returns          NCI_STATUS_OK, if write was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS rw_t2t_write_ndef_first_block (UINT16 msg_len, BOOLEAN b_update_len)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    UINT8       new_lengthfield_len;
    UINT8       write_block[4];
    UINT8       block;
    UINT8       *p_cc = &p_t2t->tag_hdr[T2T_CC0_NMN_BYTE];
    UINT16      total_blocks = p_cc[2] * 2 + T2T_FIRST_DATA_BLOCK;
    tNFC_STATUS status;
    UINT8       length_field[3];
    UINT8       index;

    p_t2t->work_offset = 0;
    new_lengthfield_len = p_t2t->new_ndef_msg_len >= T2T_LONG_NDEF_MIN_LEN ? T2T_LONG_NDEF_LEN_FIELD_LEN : T2T_SHORT_NDEF_LEN_FIELD_LEN;
    if (new_lengthfield_len == 3)
    {
        /* New NDEF is Long NDEF */
        if (msg_len == 0)
        {
            /* Clear NDEF length field */
            length_field[0] = 0x00;
            length_field[1] = 0x00;
            length_field[2] = 0x00;
        }
        else
        {
            /* Update NDEF length field with new NDEF Msg len */
            length_field[0] = T2T_LONG_NDEF_LEN_FIELD_BYTE0;
            length_field[1] = (UINT8) (msg_len >> 8);
            length_field[2] = (UINT8) (msg_len);
        }
    }
    else
    {
        /* New NDEF is Short NDEF */
        length_field[0] = (UINT8) (msg_len);
    }

    /* updating ndef_first_block with new ndef message */
    memcpy (write_block, p_t2t->ndef_first_block, T2T_BLOCK_SIZE);

    index = p_t2t->ndef_header_offset % T2T_BLOCK_SIZE;
    block = (UINT8) (p_t2t->ndef_header_offset / T2T_BLOCK_SIZE);

    while (p_t2t->work_offset == 0 && block < total_blocks)
    {
        /* update length field */
        while (index < T2T_BLOCK_SIZE && p_t2t->work_offset < p_t2t->new_ndef_msg_len)
        {
            if (rw_t2t_is_lock_res_byte ((UINT16) ((block * T2T_BLOCK_SIZE) + index)) == FALSE)
            {
                write_block[index] = length_field[p_t2t->work_offset];
                p_t2t->work_offset++;
            }
            index++;
            if (p_t2t->work_offset == new_lengthfield_len)
            {
                break;
            }
        }
        /* If more space in this block then add ndef message */
        while (index < T2T_BLOCK_SIZE && p_t2t->work_offset < (p_t2t->new_ndef_msg_len + new_lengthfield_len))
        {
            if (rw_t2t_is_lock_res_byte ((UINT16) ((block * T2T_BLOCK_SIZE) + index)) == FALSE)
            {
                write_block[index] = p_t2t->p_new_ndef_buffer[p_t2t->work_offset - new_lengthfield_len];
                p_t2t->work_offset++;
            }
            index++;
        }
        if (p_t2t->work_offset == 0)
        {
            /* If no bytes are written move to next block */
            index = 0;
            block++;
            if (block == p_t2t->ndef_last_block_num)
            {
                memcpy (write_block, p_t2t->ndef_last_block, T2T_BLOCK_SIZE);
            }
        }
    }
    if (p_t2t->work_offset == 0)
    {
        status  = NFC_STATUS_FAILED;
    }
    else
    {
        rw_t2t_update_cb (block, write_block, b_update_len);
        /* Update the identified block with newly prepared data */
        if ((status = rw_t2t_write (block, write_block)) == NFC_STATUS_OK)
        {
            p_t2t->b_read_data = FALSE;
        }
    }
    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_write_ndef_next_block
**
** Description      This function can be called to write an NDEF message block
**
** Returns          NCI_STATUS_OK, if write was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS rw_t2t_write_ndef_next_block (UINT16 block, UINT16 msg_len, BOOLEAN b_update_len)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    UINT8       new_lengthfield_len;
    UINT8       write_block[4];
    UINT8       *p_cc = &p_t2t->tag_hdr[T2T_CC0_NMN_BYTE];
    UINT16      total_blocks = p_cc[2] * 2 + T2T_FIRST_DATA_BLOCK;
    UINT16      initial_offset;
    UINT8       length_field[3];
    UINT8       index;
    tNFC_STATUS status;

    /* Write NDEF Message */
    new_lengthfield_len = p_t2t->new_ndef_msg_len >= T2T_LONG_NDEF_MIN_LEN ? T2T_LONG_NDEF_LEN_FIELD_LEN : T2T_SHORT_NDEF_LEN_FIELD_LEN;

    index = 0;

    memcpy (write_block, p_t2t->ndef_read_block, T2T_BLOCK_SIZE);

    if (p_t2t->work_offset >= new_lengthfield_len)
    {
        /* Length field is updated, write ndef message field */
        initial_offset = p_t2t->work_offset;
        while (p_t2t->work_offset == initial_offset && block < total_blocks)
        {
            while (index < T2T_BLOCK_SIZE && p_t2t->work_offset < (p_t2t->new_ndef_msg_len + new_lengthfield_len))
            {
                if (rw_t2t_is_lock_res_byte ((UINT16) ((block * T2T_BLOCK_SIZE) + index)) == FALSE)
                {
                    write_block[index] = p_t2t->p_new_ndef_buffer[p_t2t->work_offset - new_lengthfield_len];
                    p_t2t->work_offset++;
                }
                index++;
            }
            if (p_t2t->work_offset == initial_offset)
            {
                index = 0;
                block++;
            }
        }
    }
    else
    {
        /* Complete writting Length field and then write ndef message */
        new_lengthfield_len = p_t2t->new_ndef_msg_len >= T2T_LONG_NDEF_MIN_LEN ? T2T_LONG_NDEF_LEN_FIELD_LEN : T2T_SHORT_NDEF_LEN_FIELD_LEN;
        if (new_lengthfield_len == 3)
        {
            /* New NDEF is Long NDEF */
            if (msg_len == 0)
            {
                length_field[0] = 0x00;
                length_field[1] = 0x00;
                length_field[2] = 0x00;
            }
            else
            {
                length_field[0] = T2T_LONG_NDEF_LEN_FIELD_BYTE0;
                length_field[1] = (UINT8) (msg_len >> 8);
                length_field[2] = (UINT8) (msg_len);
            }
        }
        else
        {
            /* New NDEF is short NDEF */
            length_field[0] = (UINT8) (msg_len);
        }
        initial_offset = p_t2t->work_offset;
        while (p_t2t->work_offset == initial_offset && block < total_blocks)
        {
            /* Update length field */
            while (index < T2T_BLOCK_SIZE && p_t2t->work_offset < p_t2t->new_ndef_msg_len)
            {
                if (rw_t2t_is_lock_res_byte ((UINT16) ((block * T2T_BLOCK_SIZE) + index)) == FALSE)
                {
                    write_block[index] = length_field[p_t2t->work_offset];
                    p_t2t->work_offset++;
                }
                index++;
                if (p_t2t->work_offset == new_lengthfield_len)
                {
                    break;
                }
            }
            /* Update ndef message field */
            while (index < T2T_BLOCK_SIZE && p_t2t->work_offset < (p_t2t->new_ndef_msg_len + new_lengthfield_len))
            {
                if (rw_t2t_is_lock_res_byte ((UINT16) ((block * T2T_BLOCK_SIZE) + index)) == FALSE)
                {
                    write_block[index] = p_t2t->p_new_ndef_buffer[p_t2t->work_offset - new_lengthfield_len];
                    p_t2t->work_offset++;
                }
                index++;
            }
            if (p_t2t->work_offset == initial_offset)
            {
                index = 0;
                block++;
            }
        }
    }
    if (p_t2t->work_offset == initial_offset)
    {
        status  = NFC_STATUS_FAILED;
    }
    else
    {
        rw_t2t_update_cb (block, write_block, b_update_len);
        /* Write the NDEF Block */
        status = rw_t2t_write (block, write_block);
    }

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_update_cb
**
** Description      This function can be called to write an NDEF message block
**
** Returns          NCI_STATUS_OK, if write was started. Otherwise, error status.
**
*******************************************************************************/
static void rw_t2t_update_cb (UINT16 block, UINT8 *p_write_block, BOOLEAN b_update_len)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    UINT8       new_lengthfield_len;

        /* Write NDEF Message */
    new_lengthfield_len = p_t2t->new_ndef_msg_len >= T2T_LONG_NDEF_MIN_LEN ? T2T_LONG_NDEF_LEN_FIELD_LEN : T2T_SHORT_NDEF_LEN_FIELD_LEN;

    if (block == p_t2t->ndef_header_offset / T2T_BLOCK_SIZE)
    {
        /* Update ndef first block if the 'block' points to ndef first block */
        memcpy (p_t2t->ndef_first_block,p_write_block,T2T_BLOCK_SIZE);
    }
    if (p_t2t->terminator_byte_index/T2T_BLOCK_SIZE == block)
    {
        /* Update terminator block if the 'block' points to terminator tlv block */
        memcpy (p_t2t->terminator_tlv_block, p_write_block, T2T_BLOCK_LEN);
    }
    if (b_update_len == FALSE)
    {
        if (block == p_t2t->ndef_last_block_num)
        {
            p_t2t->substate         = RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LAST_BLOCK;
            p_t2t->work_offset      = 0;
            /* Update ndef final block if the 'block' points to ndef final block */
            memcpy (p_t2t->ndef_last_block,p_write_block,T2T_BLOCK_SIZE);
        }
        else
        {
            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_NEXT_BLOCK;
        }
    }
    else
    {
        if (block == p_t2t->ndef_last_block_num)
        {
            /* Update the backup of Ndef final block TLV block */
            memcpy (p_t2t->ndef_last_block,p_write_block,T2T_BLOCK_SIZE);
        }

        if (p_t2t->work_offset >= new_lengthfield_len)
        {
            if (p_t2t->terminator_byte_index != 0)
            {
                /* Add Terminator TLV as part of NDEF Write operation */
                p_t2t->substate = RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LEN_BLOCK;
            }
            else
            {
                /* Skip adding Terminator TLV */
                p_t2t->substate = RW_T2T_SUBSTATE_WAIT_WRITE_TERM_TLV_CMPLT;
            }
        }
        else
        {
            /* Part of NDEF Message Len should be added in the next block */
            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LEN_NEXT_BLOCK;
        }
    }
}

/*******************************************************************************
**
** Function         rw_t2t_get_ndef_flags
**
** Description      Prepare NDEF Flags
**
** Returns          NDEF Flag value
**
*******************************************************************************/
static UINT8 rw_t2t_get_ndef_flags (void)
{
    UINT8       flags   = 0;
    tRW_T2T_CB  *p_t2t  = &rw_cb.tcb.t2t;
    const       tT2T_INIT_TAG *p_ret;

    flags |= RW_NDEF_FL_SUPPORTED;

    if ((p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] == T2T_CC2_TMS_STATIC) || (p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] == 0))
        flags |= RW_NDEF_FL_FORMATABLE;

    if ((p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] & T2T_CC3_RWA_RO) == T2T_CC3_RWA_RO)
        flags |=RW_NDEF_FL_READ_ONLY;

    if (  ((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], FALSE, 0)) != NULL)
        &&(p_ret->b_otp)  )
    {
        /* Set otp flag */
        flags |= RW_NDEF_FL_OTP;

        /* Set Read only flag if otp tag already has NDEF Message */
        if (p_t2t->ndef_msg_len)
            flags |= RW_NDEF_FL_READ_ONLY;
    }
    return flags;
}

/*******************************************************************************
**
** Function         rw_t2t_get_ndef_max_size
**
** Description      Calculate maximum size of NDEF message that can be written
**                  on to the tag
**
** Returns          Maximum size of NDEF Message
**
*******************************************************************************/
static UINT16 rw_t2t_get_ndef_max_size (void)
{
    UINT16      offset;
    UINT8       xx;
    tRW_T2T_CB  *p_t2t   = &rw_cb.tcb.t2t;
    UINT16      tag_size = (p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] * T2T_TMS_TAG_FACTOR) + (T2T_FIRST_DATA_BLOCK * T2T_BLOCK_LEN) + p_t2t->num_lockbytes;

    for (xx = 0; xx < p_t2t->num_mem_tlvs; xx++)
        tag_size += p_t2t->mem_tlv[xx].num_bytes;

    offset                  = p_t2t->ndef_msg_offset;
    p_t2t->max_ndef_msg_len = 0;

    if (  (tag_size < T2T_STATIC_SIZE)
        ||(tag_size > (T2T_SECTOR_SIZE * T2T_MAX_SECTOR))
        ||((p_t2t->tag_hdr[T2T_CC0_NMN_BYTE] != T2T_CC0_NMN) && (p_t2t->tag_hdr[T2T_CC0_NMN_BYTE] != 0))  )
    {
        /* Tag not formated, assume static tag */
        p_t2t->max_ndef_msg_len = T2T_STATIC_SIZE - T2T_HEADER_SIZE - T2T_TLV_TYPE_LEN - T2T_SHORT_NDEF_LEN_FIELD_LEN;
        return p_t2t->max_ndef_msg_len;
    }

    /* Starting from NDEF Message offset find the first locked data byte */
    while (offset < tag_size)
    {
        if (rw_t2t_is_lock_res_byte ((UINT16) offset) == FALSE)
        {
            if (rw_t2t_is_read_only_byte ((UINT16) offset) == TRUE)
                break;
            p_t2t->max_ndef_msg_len++;
        }
        offset++;
    }
    /* NDEF Length field length changes based on NDEF size */
    if (  (p_t2t->max_ndef_msg_len >= T2T_LONG_NDEF_LEN_FIELD_BYTE0)
        &&((p_t2t->ndef_msg_offset - p_t2t->ndef_header_offset) == T2T_SHORT_NDEF_LEN_FIELD_LEN)  )
    {
        p_t2t->max_ndef_msg_len -=  (p_t2t->max_ndef_msg_len == T2T_LONG_NDEF_LEN_FIELD_BYTE0) ? 1: (T2T_LONG_NDEF_LEN_FIELD_LEN - T2T_SHORT_NDEF_LEN_FIELD_LEN);
    }
    return p_t2t->max_ndef_msg_len;
}

/*******************************************************************************
**
** Function         rw_t2t_add_terminator_tlv
**
** Description      This function will add terminator TLV after NDEF Message
**
** Returns          NCI_STATUS_OK, if write was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS rw_t2t_add_terminator_tlv (void)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status;
    UINT16      block;

    /* Add Terminator TLV after NDEF Message */
    p_t2t->terminator_tlv_block[p_t2t->terminator_byte_index%T2T_BLOCK_LEN] = TAG_TERMINATOR_TLV;
    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_WRITE_TERM_TLV_CMPLT;

    block = p_t2t->terminator_byte_index/T2T_BLOCK_LEN;
    status = rw_t2t_write (block, p_t2t->terminator_tlv_block);

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_handle_ndef_read_rsp
**
** Description      This function handles reading an NDEF message.
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_ndef_read_rsp (UINT8 *p_data)
{
    tRW_T2T_CB      *p_t2t = &rw_cb.tcb.t2t;
    tRW_READ_DATA    evt_data;
    UINT16          len;
    UINT16          offset;
    BOOLEAN         failed = FALSE;
    BOOLEAN         done   = FALSE;

    /* On the first read, adjust for any partial block offset */
    offset = 0;
    len    = T2T_READ_DATA_LEN;

    if (p_t2t->work_offset == 0)
    {
        /* The Ndef Message offset may be present in the read 16 bytes */
        offset = (p_t2t->ndef_msg_offset - (p_t2t->block_read * T2T_BLOCK_SIZE));
    }

    /* Skip all reserved and lock bytes */
    while (  (offset < len)
           &&(p_t2t->work_offset<p_t2t->ndef_msg_len)  )

    {
        if (rw_t2t_is_lock_res_byte ((UINT16) (offset + p_t2t->block_read * T2T_BLOCK_LEN)) == FALSE)
        {
            /* Collect the NDEF Message */
            p_t2t->p_ndef_buffer[p_t2t->work_offset] = p_data[offset];
            p_t2t->work_offset++;
        }
        offset++;
    }

    if (p_t2t->work_offset >= p_t2t->ndef_msg_len)
    {
        done = TRUE;
        p_t2t->ndef_status = T2T_NDEF_READ;
    }
    else
    {
        /* Read next 4 blocks */
        if (rw_t2t_read ((UINT16) (p_t2t->block_read + T2T_READ_BLOCKS)) != NFC_STATUS_OK)
            failed = TRUE;
    }

    if (failed || done)
    {
        evt_data.status = failed ? NFC_STATUS_FAILED : NFC_STATUS_OK;
        evt_data.p_data = NULL;
        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_NDEF_READ_EVT, (tRW_DATA *) &evt_data);
    }
}

/*******************************************************************************
**
** Function         rw_t2t_handle_ndef_write_rsp
**
** Description      Handle response received to reading (or part of) NDEF message.
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_ndef_write_rsp (UINT8 *p_data)
{
    tRW_T2T_CB      *p_t2t = &rw_cb.tcb.t2t;
    tRW_READ_DATA   evt_data;
    BOOLEAN         failed = FALSE;
    BOOLEAN         done   = FALSE;
    UINT16          block;
    UINT8           offset;

    switch (p_t2t->substate)
    {
    case RW_T2T_SUBSTATE_WAIT_READ_NDEF_FIRST_BLOCK:

        /* Backup the read NDEF first block */
           memcpy (p_t2t->ndef_first_block, p_data, T2T_BLOCK_LEN);
        /* Read ndef final block */
        if (rw_t2t_read_ndef_last_block () !=  NFC_STATUS_OK)
            failed = TRUE;
        break;

    case RW_T2T_SUBSTATE_WAIT_READ_NDEF_LAST_BLOCK:

        offset = (UINT8) (p_t2t->ndef_last_block_num - p_t2t->block_read) * T2T_BLOCK_SIZE;
        /* Backup the read NDEF final block */
        memcpy (p_t2t->ndef_last_block, &p_data[offset], T2T_BLOCK_LEN);
        if ((p_t2t->terminator_byte_index / T2T_BLOCK_SIZE) == p_t2t->ndef_last_block_num)
        {
            /* If Terminator TLV will reside on the NDEF Final block */
            memcpy (p_t2t->terminator_tlv_block, p_t2t->ndef_last_block, T2T_BLOCK_LEN);
            if (rw_t2t_write_ndef_first_block (0x0000, FALSE)!=  NFC_STATUS_OK)
                failed = TRUE;
        }
        else if (p_t2t->terminator_byte_index != 0)
        {
            /* If there is space for Terminator TLV and if it will reside outside NDEF Final block */
            if (rw_t2t_read_terminator_tlv_block ()!=  NFC_STATUS_OK)
                failed = TRUE;
        }
        else
        {
            if (rw_t2t_write_ndef_first_block (0x0000, FALSE)!=  NFC_STATUS_OK)
                failed = TRUE;
        }
        break;

    case RW_T2T_SUBSTATE_WAIT_READ_TERM_TLV_BLOCK:

        offset = (UINT8) (((p_t2t->terminator_byte_index / T2T_BLOCK_SIZE) - p_t2t->block_read) * T2T_BLOCK_SIZE);
        /* Backup the read Terminator TLV block */
        memcpy (p_t2t->terminator_tlv_block, &p_data[offset], T2T_BLOCK_LEN);

        /* Write the first block for new NDEF Message */
        if (rw_t2t_write_ndef_first_block (0x0000, FALSE)!=  NFC_STATUS_OK)
           failed = TRUE;
        break;

    case RW_T2T_SUBSTATE_WAIT_READ_NDEF_NEXT_BLOCK:

        offset = (UINT8) (p_t2t->ndef_read_block_num - p_t2t->block_read) * T2T_BLOCK_SIZE;
        /* Backup read block */
        memcpy (p_t2t->ndef_read_block, &p_data[offset], T2T_BLOCK_LEN);

        /* Update the block with new NDEF Message */
        if (rw_t2t_write_ndef_next_block (p_t2t->ndef_read_block_num, 0x0000, FALSE) !=  NFC_STATUS_OK)
            failed = TRUE;
        break;

    case RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_NEXT_BLOCK:
    case RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LEN_NEXT_BLOCK:
        if (rw_t2t_is_read_before_write_block ((UINT16) (p_t2t->block_written + 1), &block) == TRUE)
        {
            p_t2t->ndef_read_block_num = block;
            /* If only part of the block is going to be updated read the block to retain previous data for
               unchanged part of the block */
            if (rw_t2t_read_ndef_next_block (block) !=  NFC_STATUS_OK)
                failed = TRUE;
        }
        else
        {
            if (p_t2t->substate == RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LEN_NEXT_BLOCK)
            {
                /* Directly write the block with new NDEF contents as whole block is going to be updated */
                if (rw_t2t_write_ndef_next_block (block, p_t2t->new_ndef_msg_len, TRUE)!=  NFC_STATUS_OK)
                   failed = TRUE;
            }
            else
            {
                /* Directly write the block with new NDEF contents as whole block is going to be updated */
                if (rw_t2t_write_ndef_next_block (block, 0x0000, FALSE)!=  NFC_STATUS_OK)
                   failed = TRUE;
            }
        }
        break;

    case RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LAST_BLOCK:
        /* Write the next block for new NDEF Message */
        p_t2t->ndef_write_block = p_t2t->ndef_header_offset / T2T_BLOCK_SIZE;
        if (rw_t2t_is_read_before_write_block ((UINT16) (p_t2t->ndef_write_block), &block) == TRUE)
        {
            /* If only part of the block is going to be updated read the block to retain previous data for
               part of the block thats not going to be changed */
            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_NDEF_LEN_BLOCK;
            if (rw_t2t_read (block) !=  NFC_STATUS_OK)
                failed = TRUE;

        }
        else
        {
            /* Update NDEF Message Length in the Tag */
            if (rw_t2t_write_ndef_first_block (p_t2t->new_ndef_msg_len, TRUE)!=  NFC_STATUS_OK)
               failed = TRUE;
        }
        break;

    case RW_T2T_SUBSTATE_WAIT_READ_NDEF_LEN_BLOCK:
        /* Backup read block */
        memcpy (p_t2t->ndef_read_block, p_data, T2T_BLOCK_LEN);

        /* Update the block with new NDEF Message */
        if (rw_t2t_write_ndef_next_block (p_t2t->block_read, p_t2t->new_ndef_msg_len, TRUE) ==  NFC_STATUS_OK)
            p_t2t->ndef_write_block = p_t2t->block_read + 1;
        else
            failed = TRUE;

        break;

    case RW_T2T_SUBSTATE_WAIT_WRITE_NDEF_LEN_BLOCK:
        if (rw_t2t_add_terminator_tlv ()!=  NFC_STATUS_OK)
           failed = TRUE;
        break;

    case RW_T2T_SUBSTATE_WAIT_WRITE_TERM_TLV_CMPLT:
        done = TRUE;
        break;

    default:
        break;
    }

    if (failed || done)
    {
        evt_data.p_data = NULL;
        /* NDEF WRITE Operation is done, inform up the stack */
        evt_data.status = failed ? NFC_STATUS_FAILED : NFC_STATUS_OK;
        if (done)
        {
            if (  (p_t2t->ndef_msg_len >= 0x00FF)
                &&(p_t2t->new_ndef_msg_len < 0x00FF)  )
            {
                p_t2t->ndef_msg_offset -= 2;
            }
            else if (  (p_t2t->new_ndef_msg_len >= 0x00FF)
                     &&(p_t2t->ndef_msg_len < 0x00FF)  )
            {
                p_t2t->ndef_msg_offset += 2;
            }
            p_t2t->ndef_msg_len = p_t2t->new_ndef_msg_len;
        }
        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_NDEF_WRITE_EVT, (tRW_DATA *) &evt_data);
    }
}

/*******************************************************************************
**
** Function         rw_t2t_get_tag_size
**
** Description      This function calculates tag data area size from data read
**                  from block with version number
**
** Returns          TMS of the tag
**
*******************************************************************************/
static UINT8 rw_t2t_get_tag_size (UINT8 *p_data)
{
    UINT16  LchunkSize = 0;
    UINT16  Num_LChuncks = 0;
    UINT16  tms = 0;

    LchunkSize   = (UINT16) p_data[2] << 8 | p_data[3];
    Num_LChuncks = (UINT16) p_data[4] << 8 | p_data[5];

    tms = (UINT16) (LchunkSize * Num_LChuncks);

    tms += (T2T_STATIC_SIZE - T2T_HEADER_SIZE);

    tms /= 0x08;

    return (UINT8) tms;
}

/*******************************************************************************
**
** Function         rw_t2t_handle_config_tag_readonly
**
** Description      This function handles configure type 2 tag as read only
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_config_tag_readonly (UINT8 *p_data)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status  = NFC_STATUS_FAILED;
    BOOLEAN     b_notify = FALSE;
    UINT8       write_block[T2T_BLOCK_SIZE];
    tRW_DATA    evt;
    BOOLEAN     b_pending = FALSE;
    UINT8       read_lock = 0;
    UINT8       num_locks = 0;
    UINT16      offset;

    switch (p_t2t->substate)
    {
    case RW_T2T_SUBSTATE_WAIT_READ_CC:

        /* First soft lock the tag */
        rw_t2t_soft_lock_tag ();

        break;

    case RW_T2T_SUBSTATE_WAIT_SET_CC_RO:

        /* Successfully soft locked! Update Tag header for future reference */
        p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] = T2T_CC3_RWA_RO;
        if (!p_t2t->b_hard_lock)
        {
            /* Tag configuration complete */
            status   = NFC_STATUS_OK;
            b_notify = TRUE;
            break;
        }

        /* Coverity: [FALSE-POSITIVE error] intended fall through */
        /* Missing break statement between cases in switch statement */
        /* fall through */
    case RW_T2T_SUBSTATE_WAIT_SET_DYN_LOCK_BITS:

        num_locks = 0;

        while (num_locks < p_t2t->num_lockbytes)
        {
            if (p_t2t->lockbyte[num_locks].lock_status == RW_T2T_LOCK_UPDATE_INITIATED)
            {
                /* Update control block as one or more dynamic lock byte (s) are set */
                p_t2t->lockbyte[num_locks].lock_status = RW_T2T_LOCK_UPDATED;
            }
            if (!b_pending && p_t2t->lockbyte[num_locks].lock_status == RW_T2T_LOCK_NOT_UPDATED)
            {
                /* One or more dynamic lock bits are not set */
                b_pending = TRUE;
                read_lock = num_locks;
            }
            num_locks++;
        }

        if (b_pending)
        {
            /* Read the block where dynamic lock bits are present to avoid writing to NDEF bytes in the same block */
            offset = p_t2t->lock_tlv[p_t2t->lockbyte[read_lock].tlv_index].offset + p_t2t->lockbyte[read_lock].byte_index;
            p_t2t->substate    = RW_T2T_SUBSTATE_WAIT_READ_DYN_LOCK_BYTE_BLOCK;
            status = rw_t2t_read ((UINT16) (offset / T2T_BLOCK_LEN));
        }
        else
        {
            /* Now set Static lock bits as no more dynamic lock bits to set */

            /* Copy the internal bytes */
            memcpy (write_block, &p_t2t->tag_hdr[T2T_STATIC_LOCK0 - T2T_INTERNAL_BYTES_LEN], T2T_INTERNAL_BYTES_LEN);
            /* Set all Static lock bits */
            write_block [T2T_STATIC_LOCK0 % T2T_BLOCK_SIZE] = 0xFF;
            write_block [T2T_STATIC_LOCK1 % T2T_BLOCK_SIZE] = 0xFF;
            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_SET_ST_LOCK_BITS;
            status = rw_t2t_write ((T2T_STATIC_LOCK0 / T2T_BLOCK_SIZE), write_block);
        }
        break;

    case RW_T2T_SUBSTATE_WAIT_READ_DYN_LOCK_BYTE_BLOCK:
        /* Now set the dynamic lock bits present in the block read now */
        status = rw_t2t_set_dynamic_lock_bits (p_data);
        break;

    case RW_T2T_SUBSTATE_WAIT_SET_ST_LOCK_BITS:
        /* Tag configuration complete */
        status   = NFC_STATUS_OK;
        b_notify = TRUE;
        break;

    }

    if (status != NFC_STATUS_OK || b_notify)
    {
        /* Notify upper layer the result of Configuring Tag as Read only */
        evt.status      = status;
        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_SET_TAG_RO_EVT, (tRW_DATA *) &evt);
    }
}

/*******************************************************************************
**
** Function         rw_t2t_handle_format_tag_rsp
**
** Description      This function handles formating a type 2 tag
**
** Returns          none
**
*******************************************************************************/
static void rw_t2t_handle_format_tag_rsp (UINT8 *p_data)
{
    tRW_DATA    evt;
    UINT8       *p;
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status  = NFC_STATUS_FAILED;
    UINT16      version_no;
    const       tT2T_INIT_TAG *p_ret;
    UINT8       tms;
    UINT8       next_block = T2T_FIRST_DATA_BLOCK + 1;
    UINT16      addr, locked_area;
    BOOLEAN     b_notify = FALSE;


    p = p_t2t->ndef_final_block;
    UINT8_TO_BE_STREAM (p, p_t2t->tlv_value[2]);

    switch (p_t2t->substate)
    {
    case RW_T2T_SUBSTATE_WAIT_READ_CC:
        /* Start format operation */
        status = rw_t2t_format_tag ();
        break;

    case RW_T2T_SUBSTATE_WAIT_READ_VERSION_INFO:

        memcpy (p_t2t->tag_data, p_data, T2T_READ_DATA_LEN);
        p_t2t->b_read_data = TRUE;
        version_no = (UINT16) p_data[0] << 8 | p_data[1];
        if ((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], TRUE, version_no)) != NULL)
        {
            /* Valid Version Number */
            if (p_ret->b_calc_cc)
                /* Calculate tag size from Version Information */
                tms = rw_t2t_get_tag_size (p_data);

            else
                /* Tag size from Look up table */
                tms = p_ret->tms;

            /* Set CC with the Tag size from look up table or from calculated value */
            status = rw_t2t_set_cc (tms);
        }
        break;

    case RW_T2T_SUBSTATE_WAIT_SET_CC:

        version_no = (UINT16) p_t2t->tag_data[0] << 8 | p_t2t->tag_data[1];
        if (  (version_no == 0)
            ||((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], TRUE, version_no)) == NULL)
            ||(!p_ret->b_multi_version)
            ||(!p_ret->b_calc_cc)  )
        {
            /* Currently Formating a non blank tag or a blank tag with manufacturer
             * has only one variant of tag. Set Null NDEF TLV and complete Format Operation */
            next_block = T2T_FIRST_DATA_BLOCK;
            p = p_t2t->ndef_final_block;
        }
        else
        {
            addr        = (UINT16) (((UINT16) p_t2t->tag_data[2] << 8 | p_t2t->tag_data[3]) * ((UINT16) p_t2t->tag_data[4] << 8 | p_t2t->tag_data[5]) + T2T_STATIC_SIZE);
            locked_area = ((UINT16) p_t2t->tag_data[2] << 8 | p_t2t->tag_data[3]) * ((UINT16) p_t2t->tag_data[6]);

            if ((status = rw_t2t_set_lock_tlv (addr, p_t2t->tag_data[7], locked_area)) == NFC_STATUS_REJECTED)
            {
                /* Cannot calculate Lock TLV. Set Null NDEF TLV and complete Format Operation */
                next_block = T2T_FIRST_DATA_BLOCK;
                p = p_t2t->ndef_final_block;
            }
            else
                break;
        }

        /* falls through */
    case RW_T2T_SUBSTATE_WAIT_SET_LOCK_TLV:

        /* Prepare NULL NDEF TLV, TERMINATOR_TLV */
        UINT8_TO_BE_STREAM (p, TAG_NDEF_TLV);
        UINT8_TO_BE_STREAM (p, 0);

        if (  ((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], FALSE, 0)) != NULL)
            &&(!p_ret->b_otp)  )
        {
            UINT8_TO_BE_STREAM (p, TAG_TERMINATOR_TLV);
        }
        else
            UINT8_TO_BE_STREAM (p, 0);

        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_SET_NULL_NDEF;
        /* send WRITE-E8 command */
        if ((status = rw_t2t_write (next_block, p_t2t->ndef_final_block)) == NFC_STATUS_OK)
            p_t2t->b_read_data = FALSE;
        break;

    case RW_T2T_SUBSTATE_WAIT_SET_NULL_NDEF:
        /* Tag Formated successfully */
        status   = NFC_STATUS_OK;
        b_notify = TRUE;
        break;

    default:
        break;

    }

    if (status != NFC_STATUS_OK || b_notify)
    {
        /* Notify upper layer the result of Format op */
        evt.status      = status;
        rw_t2t_handle_op_complete ();
        (*rw_cb.p_cback) (RW_T2T_FORMAT_CPLT_EVT, (tRW_DATA *) &evt);
    }

}

/*******************************************************************************
**
** Function         rw_t2t_update_attributes
**
** Description      This function will update attribute for the current segment
**                  based on lock and reserved bytes
**
** Returns          None
**
*******************************************************************************/
static void rw_t2t_update_attributes (void)
{
    UINT8       count = 0;
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    UINT16      lower_offset;
    UINT16      upper_offset;
    UINT16      offset;
    UINT8       num_bytes;

    /* Prepare attr for the current segment */
    memset (p_t2t->attr, 0, RW_T2T_SEGMENT_SIZE * sizeof (UINT8));

    /* calculate offset where the current segment starts in the tag */
    lower_offset   = p_t2t->segment * RW_T2T_SEGMENT_BYTES;
    /* calculate offset where the current segment ends in the tag */
    upper_offset   = (p_t2t->segment + 1) * RW_T2T_SEGMENT_BYTES;


    /* check offset of lock bytes in the tag and update p_t2t->attr
     * for every lock byte that is present in the current segment */
    count = 0;
    while (count < p_t2t->num_lockbytes)
    {
        offset = p_t2t->lock_tlv[p_t2t->lockbyte[count].tlv_index].offset + p_t2t->lockbyte[count].byte_index;
        if (offset >= lower_offset && offset < upper_offset)
        {
            /* Calculate offset in the current segment as p_t2t->attr is prepared for one segment only */
            offset %= RW_T2T_SEGMENT_BYTES;
            /* Every bit in p_t2t->attr indicates one byte of the tag is either a lock/reserved byte or not
             * So, each array element in p_t2t->attr covers two blocks in the tag as T2 block size is 4 and array element size is 8
             * Set the corresponding bit in attr to indicate - reserved byte */
            p_t2t->attr[offset / TAG_BITS_PER_BYTE] |= rw_t2t_mask_bits[offset % TAG_BITS_PER_BYTE];
        }
        count++;
    }


    /* Search reserved bytes identified by all memory tlvs present in the tag */
    count = 0;
    while (count < p_t2t->num_mem_tlvs)
    {
        /* check the offset of reserved bytes in the tag and update  p_t2t->attr
         * for every  reserved byte that is present in the current segment */
        num_bytes = 0;
        while (num_bytes < p_t2t->mem_tlv[count].num_bytes)
        {
            offset = p_t2t->mem_tlv[count].offset + num_bytes;
            if (offset >= lower_offset && offset < upper_offset)
            {
                /* Let offset represents offset in the current segment as p_t2t->attr is prepared for one segment only */
                offset %= RW_T2T_SEGMENT_BYTES;
                /* Every bit in p_t2t->attr indicates one byte of the tag is either a lock/reserved byte or not
                 * So, each array element in p_t2t->attr covers two blocks in the tag as T2 block size is 4 and array element size is 8
                 * Set the corresponding bit in attr to indicate - reserved byte */
                p_t2t->attr[offset /TAG_BITS_PER_BYTE] |= rw_t2t_mask_bits[offset % TAG_BITS_PER_BYTE];
            }
            num_bytes++;
        }
        count++;
    }
}

/*******************************************************************************
**
** Function         rw_t2t_get_lock_bits_for_segment
**
** Description      This function returns the offset of lock bits associated for
**                  the specified segment
**
** Parameters:      segment: The segment number to which lock bits are associated
**                  p_start_byte: The offset of lock byte that contains the first
**                                lock bit for the segment
**                  p_start_bit:  The offset of the lock bit in the lock byte
**
**                  p_end_byte:   The offset of the last bit associcated to the
**                                segment
**
** Returns          Total number of lock bits assigned to the specified segment
**
*******************************************************************************/
static UINT8 rw_t2t_get_lock_bits_for_segment (UINT8 segment, UINT8 *p_start_byte, UINT8 *p_start_bit, UINT8 *p_end_byte)
{
    UINT8       total_bits = 0;
    UINT16      byte_count = 0;
    UINT16      lower_offset, upper_offset;
    UINT8       num_dynamic_locks = 0;
    UINT8       bit_count  = 0;
    UINT8       bytes_locked_per_bit;
    UINT8       num_bits;
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    BOOLEAN     b_all_bits_are_locks = TRUE;
    UINT16      tag_size;
    UINT8       xx;

    tag_size      = (p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] * T2T_TMS_TAG_FACTOR) + (T2T_FIRST_DATA_BLOCK * T2T_BLOCK_SIZE) + p_t2t->num_lockbytes;

    for (xx = 0; xx < p_t2t->num_mem_tlvs; xx++)
        tag_size += p_t2t->mem_tlv[xx].num_bytes;

    lower_offset  = segment * RW_T2T_SEGMENT_BYTES;
    if (segment == 0)
    {
        lower_offset  += T2T_STATIC_SIZE;
    }
    upper_offset  = (segment + 1) * RW_T2T_SEGMENT_BYTES;

    byte_count = T2T_STATIC_SIZE;
    if (tag_size < upper_offset)
    {
        upper_offset = tag_size;
    }

    *p_start_byte = num_dynamic_locks;
    *p_start_bit  = 0;

    while (  (byte_count <= lower_offset)
           &&(num_dynamic_locks < p_t2t->num_lockbytes)  )
    {
        bytes_locked_per_bit = p_t2t->lock_tlv[p_t2t->lockbyte[num_dynamic_locks].tlv_index].bytes_locked_per_bit;
        /* Number of bits in the current lock byte */
        b_all_bits_are_locks = ((p_t2t->lockbyte[num_dynamic_locks].byte_index + 1) * TAG_BITS_PER_BYTE <= p_t2t->lock_tlv[p_t2t->lockbyte[num_dynamic_locks].tlv_index].num_bits);
        num_bits             =  b_all_bits_are_locks ? TAG_BITS_PER_BYTE : p_t2t->lock_tlv[p_t2t->lockbyte[num_dynamic_locks].tlv_index].num_bits % TAG_BITS_PER_BYTE;

        if (((bytes_locked_per_bit * num_bits) + byte_count) <= lower_offset)
        {
            /* Skip this lock byte as it covers different segment */
            byte_count += bytes_locked_per_bit * num_bits;
            num_dynamic_locks++;
        }
        else
        {
            bit_count = 0;
            while (bit_count < num_bits)
            {
                byte_count += bytes_locked_per_bit;
                if (byte_count > lower_offset)
                {
                    /* First lock bit that is used to lock this segment */
                    *p_start_byte = num_dynamic_locks;
                    *p_end_byte   = num_dynamic_locks;
                    *p_start_bit  = bit_count;
                    bit_count++;
                    total_bits    = 1;
                    break;
                }
                bit_count++;
            }
        }
    }
    if (num_dynamic_locks == p_t2t->num_lockbytes)
    {
        return 0;
    }
    while (  (byte_count < upper_offset)
           &&(num_dynamic_locks < p_t2t->num_lockbytes)  )
    {
        bytes_locked_per_bit = p_t2t->lock_tlv[p_t2t->lockbyte[num_dynamic_locks].tlv_index].bytes_locked_per_bit;
        /* Number of bits in the current lock byte */
        b_all_bits_are_locks = ((p_t2t->lockbyte[num_dynamic_locks].byte_index + 1) * TAG_BITS_PER_BYTE <= p_t2t->lock_tlv[p_t2t->lockbyte[num_dynamic_locks].tlv_index].num_bits);
        num_bits             =  b_all_bits_are_locks ? TAG_BITS_PER_BYTE : p_t2t->lock_tlv[p_t2t->lockbyte[num_dynamic_locks].tlv_index].num_bits % TAG_BITS_PER_BYTE;

        if ((bytes_locked_per_bit * (num_bits - bit_count)) + byte_count < upper_offset)
        {
            /* Collect all lock bits that covers the current segment */
            byte_count += bytes_locked_per_bit * (num_bits - bit_count);
            total_bits += num_bits - bit_count;
            bit_count   = 0;
            *p_end_byte = num_dynamic_locks;
            num_dynamic_locks++;
        }
        else
        {
            /* The last lock byte that covers the current segment */
            bit_count = 0;
            while (bit_count < num_bits)
            {
                /* The last lock bit that is used to lock this segment */
                byte_count += bytes_locked_per_bit;
                if (byte_count >= upper_offset)
                {
                    *p_end_byte = num_dynamic_locks;
                    total_bits  += (bit_count + 1);
                    break;
                }
                bit_count++;
            }
        }
    }
    return total_bits;
}

/*******************************************************************************
**
** Function         rw_t2t_update_lock_attributes
**
** Description      This function will check if the tag index passed as
**                  argument is a locked byte and return TRUE or FALSE
**
** Parameters:      index, the index of the byte in the tag
**
**
** Returns          TRUE, if the specified index in the tag is a locked or
**                        reserved or otp byte
**                  FALSE, otherwise
**
*******************************************************************************/
static void rw_t2t_update_lock_attributes (void)
{
    tRW_T2T_CB  *p_t2t                      = &rw_cb.tcb.t2t;
    UINT8       xx                          = 0;
    UINT8       num_static_lock_bytes       = 0;
    UINT8       num_dyn_lock_bytes          = 0;
    UINT8       bits_covered                = 0;
    UINT8       bytes_covered               = 0;
    UINT8       block_count                 = 0;
    BOOLEAN     b_all_bits_are_locks        = TRUE;
    UINT8       bytes_locked_per_lock_bit;
    UINT8       start_lock_byte;
    UINT8       start_lock_bit;
    UINT8       end_lock_byte;
    UINT8       num_lock_bits;
    UINT8       total_bits;


    /* Prepare lock_attr for the current segment */
    memset (p_t2t->lock_attr, 0, RW_T2T_SEGMENT_SIZE * sizeof (UINT8));

    block_count                 = 0;
    if (p_t2t->segment == 0)
    {
        /* Update lock_attributes based on static lock bytes */
        xx                      = 0;
        num_static_lock_bytes   = 0;
        block_count             = 0;
        num_lock_bits           = TAG_BITS_PER_BYTE - 1; /* the inner while loop increases xx by 2. need (-1) to avoid coverity overrun error */

        while (num_static_lock_bytes < T2T_NUM_STATIC_LOCK_BYTES)
        {
            /* Update lock attribute based on 2 static locks */
            while (xx < num_lock_bits)
            {
                p_t2t->lock_attr[block_count] = 0x00;

                if (p_t2t->tag_hdr[T2T_STATIC_LOCK0 + num_static_lock_bytes] & rw_t2t_mask_bits[xx++])
                {
                    /* If the bit is set then 1 block is locked */
                    p_t2t->lock_attr[block_count] = 0x0F;
                }

                if (p_t2t->tag_hdr[T2T_STATIC_LOCK0 + num_static_lock_bytes] & rw_t2t_mask_bits[xx++])
                {
                    /* If the bit is set then 1 block is locked */
                    p_t2t->lock_attr[block_count] |= 0xF0;
                }
                block_count++;
            }
            num_static_lock_bytes++;
            xx = 0;
        }
        /* UID is always locked, irrespective of the lock value */
        p_t2t->lock_attr[0x00] = 0xFF;
    }

    /* Get lock bits applicable for the current segment */
    if ((total_bits = rw_t2t_get_lock_bits_for_segment (p_t2t->segment,&start_lock_byte, &start_lock_bit, &end_lock_byte)) != 0)
    {
        /* update lock_attributes based on current segment using dynamic lock bytes */
        xx                            = start_lock_bit;
        num_dyn_lock_bytes            = start_lock_byte;
        bits_covered                  = 0;
        bytes_covered                 = 0;
        num_lock_bits                 = TAG_BITS_PER_BYTE;
        p_t2t->lock_attr[block_count] = 0;

        while (num_dyn_lock_bytes <= end_lock_byte)
        {
            bytes_locked_per_lock_bit  = p_t2t->lock_tlv[p_t2t->lockbyte[num_dyn_lock_bytes].tlv_index].bytes_locked_per_bit;
            /* Find number of bits in the byte are lock bits */
            b_all_bits_are_locks = ((p_t2t->lockbyte[num_dyn_lock_bytes].byte_index + 1) * TAG_BITS_PER_BYTE <= p_t2t->lock_tlv[p_t2t->lockbyte[num_dyn_lock_bytes].tlv_index].num_bits);
            num_lock_bits        =  b_all_bits_are_locks ? TAG_BITS_PER_BYTE : p_t2t->lock_tlv[p_t2t->lockbyte[num_dyn_lock_bytes].tlv_index].num_bits % TAG_BITS_PER_BYTE;

            while (xx < num_lock_bits)
            {
                bytes_covered = 0;
                while (bytes_covered < bytes_locked_per_lock_bit)
                {
                    if (p_t2t->lockbyte[num_dyn_lock_bytes].lock_byte & rw_t2t_mask_bits[xx])
                    {
                        /* If the bit is set then it is locked */
                        p_t2t->lock_attr[block_count] |= 0x01 << bits_covered;
                    }
                    bytes_covered++;
                    bits_covered++;
                    if (bits_covered == TAG_BITS_PER_BYTE)
                    {
                        /* Move to next 8 bytes */
                        bits_covered = 0;
                        block_count++;
                        /* Assume unlocked before updating using locks */
                        if (block_count < RW_T2T_SEGMENT_SIZE)
                            p_t2t->lock_attr[block_count] = 0;
                    }
                }
                xx++;
            }
            num_dyn_lock_bytes++;
            xx = 0;
        }
    }
}

/*******************************************************************************
**
** Function         rw_t2t_is_lock_res_byte
**
** Description      This function will check if the tag index passed as
**                  argument is a lock or reserved or otp byte and return
**                  TRUE or FALSE
**
** Parameters:      index, the index of the byte in the tag
**
**
** Returns          TRUE, if the specified index in the tag is a locked or
**                        reserved or otp byte
**                  FALSE, otherwise
**
*******************************************************************************/
static BOOLEAN rw_t2t_is_lock_res_byte (UINT16 index)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;

    p_t2t->segment = (UINT8) (index / RW_T2T_SEGMENT_BYTES);

    if (p_t2t->attr_seg != p_t2t->segment)
    {
        /* Update attributes for the current segment */
        rw_t2t_update_attributes ();
        p_t2t->attr_seg = p_t2t->segment;
    }

    index = index % RW_T2T_SEGMENT_BYTES;
    /* Every bit in p_t2t->attr indicates one specific byte of the tag is either a lock/reserved byte or not
     * So, each array element in p_t2t->attr covers two blocks in the tag as T2 block size is 4 and array element size is 8
     * Find the block and offset for the index (passed as argument) and Check if the offset bit in the
     * p_t2t->attr[block/2] is set or not. If the bit is set then it is a lock/reserved byte, otherwise not */

    return ((p_t2t->attr[index /8] & rw_t2t_mask_bits[index % 8]) == 0) ? FALSE:TRUE;
}

/*******************************************************************************
**
** Function         rw_t2t_is_read_only_byte
**
** Description      This function will check if the tag index passed as
**                  argument is a locked and return
**                  TRUE or FALSE
**
** Parameters:      index, the index of the byte in the tag
**
**
** Returns          TRUE, if the specified index in the tag is a locked or
**                        reserved or otp byte
**                  FALSE, otherwise
**
*******************************************************************************/
static BOOLEAN rw_t2t_is_read_only_byte (UINT16 index)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;

    p_t2t->segment = (UINT8) (index / RW_T2T_SEGMENT_BYTES);

    if (p_t2t->lock_attr_seg != p_t2t->segment)
    {
        /* Update lock attributes for the current segment */
        rw_t2t_update_lock_attributes ();
        p_t2t->lock_attr_seg = p_t2t->segment;
    }

    index = index % RW_T2T_SEGMENT_BYTES;
    /* Every bit in p_t2t->lock_attr indicates one specific byte of the tag is a read only byte or read write byte
     * So, each array element in p_t2t->lock_attr covers two blocks of the tag as T2 block size is 4 and array element size is 8
     * Find the block and offset for the index (passed as argument) and Check if the offset bit in
     * p_t2t->lock_attr[block/2] is set or not. If the bit is set then it is a read only byte, otherwise read write byte */

    return ((p_t2t->lock_attr[index /8] & rw_t2t_mask_bits[index % 8]) == 0) ? FALSE:TRUE;
}

/*******************************************************************************
**
** Function         rw_t2t_set_dynamic_lock_bits
**
** Description      This function will set dynamic lock bits as part of
**                  configuring tag as read only
**
** Returns
**                  NFC_STATUS_OK, Command sent to set dynamic lock bits
**                  NFC_STATUS_FAILED: otherwise
**
*******************************************************************************/
tNFC_STATUS rw_t2t_set_dynamic_lock_bits (UINT8 *p_data)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    UINT8       write_block[T2T_BLOCK_SIZE];
    UINT16      offset;
    UINT16      next_offset;
    UINT8       num_bits;
    UINT8       next_num_bits;
    tNFC_STATUS status      = NFC_STATUS_FAILED;
    UINT8       num_locks;
    UINT8       lock_count;
    BOOLEAN     b_all_bits_are_locks = TRUE;

    num_locks = 0;

    memcpy (write_block, p_data, T2T_BLOCK_SIZE);
    while (num_locks < p_t2t->num_lockbytes)
    {
        if (p_t2t->lockbyte[num_locks].lock_status == RW_T2T_LOCK_NOT_UPDATED)
        {
            offset = p_t2t->lock_tlv[p_t2t->lockbyte[num_locks].tlv_index].offset + p_t2t->lockbyte[num_locks].byte_index;

            /* Check if all bits are lock bits in the byte */
            b_all_bits_are_locks = ((p_t2t->lockbyte[num_locks].byte_index + 1) * TAG_BITS_PER_BYTE <= p_t2t->lock_tlv[p_t2t->lockbyte[num_locks].tlv_index].num_bits);
            num_bits             =  b_all_bits_are_locks ? TAG_BITS_PER_BYTE : p_t2t->lock_tlv[p_t2t->lockbyte[num_locks].tlv_index].num_bits % TAG_BITS_PER_BYTE;

            write_block[(UINT8) (offset%T2T_BLOCK_SIZE)] |=  tags_pow (2,num_bits) - 1;
            lock_count = num_locks + 1;

            /* Set all the lock bits in the block using a sing block write command */
            while (lock_count < p_t2t->num_lockbytes)
            {
                next_offset          = p_t2t->lock_tlv[p_t2t->lockbyte[lock_count].tlv_index].offset + p_t2t->lockbyte[lock_count].byte_index;

                /* Check if all bits are lock bits in the byte */
                b_all_bits_are_locks = ((p_t2t->lockbyte[lock_count].byte_index + 1) * TAG_BITS_PER_BYTE <= p_t2t->lock_tlv[p_t2t->lockbyte[lock_count].tlv_index].num_bits);
                next_num_bits        = b_all_bits_are_locks ? TAG_BITS_PER_BYTE : p_t2t->lock_tlv[p_t2t->lockbyte[lock_count].tlv_index].num_bits % TAG_BITS_PER_BYTE;

                if (next_offset / T2T_BLOCK_SIZE == offset / T2T_BLOCK_SIZE)
                {
                    write_block[(UINT8) (next_offset % T2T_BLOCK_SIZE)] |=  tags_pow (2, next_num_bits) - 1;
                }
                else
                    break;
                lock_count ++;
            }

            p_t2t->substate = RW_T2T_SUBSTATE_WAIT_SET_DYN_LOCK_BITS;
            /* send WRITE command to set dynamic lock bits */
            if ((status = rw_t2t_write ((UINT16) (offset / T2T_BLOCK_SIZE), write_block)) == NFC_STATUS_OK)
            {
                while (lock_count >  num_locks)
                {
                    /* Set update initiated flag to indicate a write command is sent to set dynamic lock bits of the block */
                    p_t2t->lockbyte[lock_count - 1].lock_status = RW_T2T_LOCK_UPDATE_INITIATED;
                    lock_count --;
                }
            }
            else
                status = NFC_STATUS_FAILED;

            break;

        }
        num_locks++;
    }

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_set_lock_tlv
**
** Description      This function will set lock control tlv on the blank
**                  activated type 2 tag based on values read from version block
**
** Parameters:      TAG data memory size
**
** Returns
**                  NFC_STATUS_OK, Command sent to set Lock TLV
**                  NFC_STATUS_FAILED: otherwise
**
*******************************************************************************/
tNFC_STATUS rw_t2t_set_lock_tlv (UINT16 addr, UINT8 num_dyn_lock_bits, UINT16 locked_area_size)
{
    tNFC_STATUS status  = NFC_STATUS_FAILED;
    INT8        PageAddr = 0;
    INT8        BytePerPage = 0;
    INT8        ByteOffset = 0;
    UINT8       a;
    UINT8       data_block[T2T_BLOCK_SIZE];
    tRW_T2T_CB  *p_t2t  = &rw_cb.tcb.t2t;
    UINT8       *p;
    UINT8       xx;

    for (xx = 15; xx >0; xx--)
    {
        a  = (UINT8) (addr / xx);
        a += (addr % xx) ? 1:0;

        BytePerPage = (INT8) tags_log2 (a);
        ByteOffset  = (INT8) (addr - xx * tags_pow (2, BytePerPage));

        if (ByteOffset < 16)
        {
            PageAddr = xx;
            break;
        }
    }

    if ((ByteOffset < 16) && (BytePerPage < 16) && (PageAddr < 16))
    {
        memset (data_block, 0, T2T_BLOCK_SIZE);
        p = data_block;
        UINT8_TO_BE_STREAM (p, T2T_TLV_TYPE_LOCK_CTRL);
        UINT8_TO_BE_STREAM (p, T2T_TLEN_LOCK_CTRL_TLV);
        UINT8_TO_BE_STREAM (p, (PageAddr << 4 | ByteOffset));
        UINT8_TO_BE_STREAM (p, num_dyn_lock_bits);

        p_t2t->tlv_value[0] = PageAddr << 4 | ByteOffset;
        p_t2t->tlv_value[1] = num_dyn_lock_bits;
        p_t2t->tlv_value[2] = (UINT8) (BytePerPage << 4 | tags_log2 (locked_area_size));

        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_SET_LOCK_TLV;

        /* send WRITE-E8 command */
        if ((status = rw_t2t_write (T2T_FIRST_DATA_BLOCK, data_block)) == NFC_STATUS_OK)
        {
            p_t2t->b_read_data = FALSE;
        }
        else
            p_t2t->substate = RW_T2T_SUBSTATE_NONE;
    }
    else
        status = NFC_STATUS_REJECTED;

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_set_cc
**
** Description      This function will set Capability Container on the activated
**                  type 2 tag with default values of CC0, CC1, CC4 and specified
**                  CC3 value
**
** Parameters:      CC3 value of the tag
**
** Returns
**                  NFC_STATUS_OK, Command sent to set CC
**                  NFC_STATUS_FAILED: otherwise
**
*******************************************************************************/
tNFC_STATUS rw_t2t_set_cc (UINT8 tms)
{
    UINT8               cc_block[T2T_BLOCK_SIZE];
    tRW_T2T_CB          *p_t2t  = &rw_cb.tcb.t2t;
    tNFC_STATUS         status  = NFC_STATUS_FAILED;
    UINT8               *p;

    memset (cc_block, 0, T2T_BLOCK_SIZE);
    memset (p_t2t->ndef_final_block, 0, T2T_BLOCK_SIZE);
    p = cc_block;

    /* Prepare Capability Container */
    UINT8_TO_BE_STREAM (p, T2T_CC0_NMN);
    UINT8_TO_BE_STREAM (p, T2T_CC1_VNO);
    UINT8_TO_BE_STREAM (p, tms);
    UINT8_TO_BE_STREAM (p, T2T_CC3_RWA_RW);

    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_SET_CC;

    /* send WRITE-E8 command */
    if ((status = rw_t2t_write (T2T_CC_BLOCK, cc_block)) == NFC_STATUS_OK)
    {
        p_t2t->state    = RW_T2T_STATE_FORMAT_TAG;
        p_t2t->b_read_hdr = FALSE;
    }
    else
        p_t2t->substate = RW_T2T_SUBSTATE_NONE;

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_format_tag
**
** Description      This function will format tag based on Manufacturer ID
**
** Returns
**                  NFC_STATUS_OK, Command sent to format Tag
**                  NFC_STATUS_FAILED: otherwise
**
*******************************************************************************/
tNFC_STATUS rw_t2t_format_tag (void)
{
    tRW_T2T_CB          *p_t2t  = &rw_cb.tcb.t2t;
    const tT2T_INIT_TAG *p_ret;
    UINT8               tms;
    tNFC_STATUS         status  = NFC_STATUS_FAILED;
    BOOLEAN             b_blank_tag = TRUE;

    if ((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], FALSE, 0)) == NULL)
    {
        RW_TRACE_WARNING1 ("rw_t2t_format_tag - Unknown Manufacturer ID: %u, Cannot Format the tag!", p_t2t->tag_hdr[0]);
        return (NFC_STATUS_REJECTED);
    }

    if (p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] != 0)
    {
        /* If OTP tag has valid NDEF Message, cannot format the tag */
        if (  (p_t2t->ndef_msg_len > 0)
            &&(p_ret->b_otp)  )
        {
            RW_TRACE_WARNING0 ("rw_t2t_format_tag - Cannot Format a OTP tag with NDEF Message!");
            return (NFC_STATUS_FAILED);
        }

        if (  ((p_t2t->tag_hdr[T2T_CC0_NMN_BYTE] != 0) && (p_t2t->tag_hdr[T2T_CC0_NMN_BYTE] != T2T_CC0_NMN))
            ||((p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != 0) && (p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != T2T_CC1_LEGACY_VNO) && (p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != T2T_CC1_VNO) && (p_t2t->tag_hdr[T2T_CC1_VNO_BYTE] != T2T_CC1_NEW_VNO)) )
        {
            RW_TRACE_WARNING0 ("rw_t2t_format_tag - Tag not blank to Format!");
            return (NFC_STATUS_FAILED);
        }
        else
        {
            tms = p_t2t->tag_hdr[T2T_CC2_TMS_BYTE];
            b_blank_tag = FALSE;
        }
    }
    else
        tms = p_ret->tms;

    memset (p_t2t->tag_data, 0, T2T_READ_DATA_LEN);

    if (!b_blank_tag || !p_ret->b_multi_version)
    {
        status = rw_t2t_set_cc (tms);
    }
    else if (p_ret->version_block != 0)
    {
        /* If Version number is not read, READ it now */
        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_VERSION_INFO;

        if ((status = rw_t2t_read (p_ret->version_block)) == NFC_STATUS_OK)
            p_t2t->state    = RW_T2T_STATE_FORMAT_TAG;
        else
            p_t2t->substate = RW_T2T_SUBSTATE_NONE;
    }
    else
    {
        /* UID block is the version block */
        p_t2t->state    = RW_T2T_STATE_FORMAT_TAG;
        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_VERSION_INFO;
        rw_t2t_handle_format_tag_rsp (p_t2t->tag_hdr);
    }

    return status;
}

/*******************************************************************************
**
** Function         rw_t2t_soft_lock_tag
**
** Description      This function will soft lock the tag after validating CC.
**
** Returns
**                  NFC_STATUS_OK, Command sent to soft lock the tag
**                  NFC_STATUS_FAILED: otherwise
**
*******************************************************************************/
tNFC_STATUS rw_t2t_soft_lock_tag (void)
{
    tRW_T2T_CB  *p_t2t  = &rw_cb.tcb.t2t;
    tNFC_STATUS status  = NFC_STATUS_FAILED;
    UINT8       write_block[T2T_BLOCK_SIZE];
    UINT8       num_locks;

    /* If CC block is read and cc3 is soft locked, reject the command */
    if ((p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] & T2T_CC3_RWA_RO) == T2T_CC3_RWA_RO)
    {
        RW_TRACE_ERROR1 ("rw_t2t_soft_lock_tag: Error: Type 2 tag is in Read only state, CC3: %u", p_t2t->tag_hdr[T2T_CC3_RWA_BYTE]);
        return (NFC_STATUS_FAILED);
    }

    if (p_t2t->b_hard_lock)
    {
        /* Should have performed NDEF Detection on dynamic memory structure tag, before permanently converting to Read only
         * Even when no lock control tlv is present, default lock bytes should be present */

        if ((p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] != T2T_CC2_TMS_STATIC) && (p_t2t->num_lockbytes == 0))
        {
            RW_TRACE_ERROR0 ("rw_t2t_soft_lock_tag: Error: Lock TLV not detected! Cannot hard lock the tag");
            return (NFC_STATUS_FAILED);
        }

        /* On dynamic memory structure tag, reset all lock bytes status to 'Not Updated' if not in Updated status */
        num_locks = 0;
        while (num_locks < p_t2t->num_lockbytes)
        {
            if (p_t2t->lockbyte[num_locks].lock_status != RW_T2T_LOCK_UPDATED)
                p_t2t->lockbyte[num_locks].lock_status = RW_T2T_LOCK_NOT_UPDATED;
            num_locks++;
        }
    }

    memcpy (write_block, &p_t2t->tag_hdr[T2T_CC0_NMN_BYTE], T2T_BLOCK_SIZE);
    write_block[(T2T_CC3_RWA_BYTE % T2T_BLOCK_SIZE)] = T2T_CC3_RWA_RO;

    p_t2t->substate    = RW_T2T_SUBSTATE_WAIT_SET_CC_RO;
    /* First Soft lock the tag */
    if ((status = rw_t2t_write (T2T_CC_BLOCK, write_block)) == NFC_STATUS_OK)
    {
        p_t2t->state        = RW_T2T_STATE_SET_TAG_RO;
        p_t2t->b_read_hdr   = FALSE;
    }
    else
    {
        p_t2t->substate     = RW_T2T_SUBSTATE_NONE;
    }
    return status;
}

/*****************************************************************************
**
** Function         RW_T2tFormatNDef
**
** Description
**      Format Tag content
**
** Returns
**      NFC_STATUS_OK, Command sent to format Tag
**      NFC_STATUS_FAILED: otherwise
**
*****************************************************************************/
tNFC_STATUS RW_T2tFormatNDef (void)
{
    tRW_T2T_CB          *p_t2t  = &rw_cb.tcb.t2t;
    tNFC_STATUS         status  = NFC_STATUS_FAILED;

    if (p_t2t->state != RW_T2T_STATE_IDLE)
    {
        RW_TRACE_WARNING1 ("RW_T2tFormatNDef - Tag not initialized/ Busy! State: %u", p_t2t->state);
        return (NFC_STATUS_FAILED);
    }

    if (!p_t2t->b_read_hdr)
    {
        /* If UID is not read, READ it now */
        p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_CC;

        if ((status = rw_t2t_read (0)) == NFC_STATUS_OK)
            p_t2t->state    = RW_T2T_STATE_FORMAT_TAG;
        else
            p_t2t->substate = RW_T2T_SUBSTATE_NONE;
    }
    else
    {
        if ((status = rw_t2t_format_tag ()) != NFC_STATUS_OK)
            p_t2t->b_read_hdr = FALSE;
    }
    return status;
}

/*******************************************************************************
**
** Function         RW_T2tLocateTlv
**
** Description      This function is used to perform TLV detection on a Type 2
**                  tag, and retrieve the tag's TLV attribute information.
**
**                  Before using this API, the application must call
**                  RW_SelectTagType to indicate that a Type 2 tag has been
**                  activated.
**
** Parameters:      tlv_type : TLV to detect
**
** Returns          NCI_STATUS_OK, if detection was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS RW_T2tLocateTlv (UINT8 tlv_type)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status;
    UINT16      block;

    if (p_t2t->state != RW_T2T_STATE_IDLE)
    {
        RW_TRACE_ERROR1 ("Error: Type 2 tag not activated or Busy - State: %u", p_t2t->state);
        return (NFC_STATUS_BUSY);
    }

    if ((tlv_type != TAG_LOCK_CTRL_TLV) && (tlv_type != TAG_MEM_CTRL_TLV) && (tlv_type != TAG_NDEF_TLV) && (tlv_type != TAG_PROPRIETARY_TLV))
    {
        RW_TRACE_API1 ("RW_T2tLocateTlv - Cannot search TLV: 0x%02x", tlv_type);
        return (NFC_STATUS_FAILED);
    }

    if (  (tlv_type == TAG_LOCK_CTRL_TLV)
        &&(p_t2t->b_read_hdr)
        &&(p_t2t->tag_hdr[T2T_CC2_TMS_BYTE] == T2T_CC2_TMS_STATIC)  )
    {
        p_t2t->b_read_hdr = FALSE;
        RW_TRACE_API1 ("RW_T2tLocateTlv - No Lock tlv in static structure tag, CC[0]: 0x%02x", p_t2t->tag_hdr[T2T_CC2_TMS_BYTE]);
        return (NFC_STATUS_FAILED);
    }

    if (  (tlv_type == TAG_NDEF_TLV)
        &&(p_t2t->b_read_hdr)
        &&(p_t2t->tag_hdr[T2T_CC0_NMN_BYTE] != T2T_CC0_NMN)  )
    {
        p_t2t->b_read_hdr = FALSE;
        RW_TRACE_WARNING3 ("RW_T2tLocateTlv - Invalid NDEF Magic Number!, CC[0]: 0x%02x, CC[1]: 0x%02x, CC[3]: 0x%02x", p_t2t->tag_hdr[T2T_CC0_NMN_BYTE], p_t2t->tag_hdr[T2T_CC1_VNO_BYTE], p_t2t->tag_hdr[T2T_CC3_RWA_BYTE]);
        return (NFC_STATUS_FAILED);
    }

    p_t2t->work_offset = 0;
    p_t2t->tlv_detect  = tlv_type;

    /* Reset control block variables based on type of tlv to detect */
    if (tlv_type == TAG_LOCK_CTRL_TLV)
    {
        p_t2t->num_lockbytes    = 0;
        p_t2t->num_lock_tlvs    = 0;
    }
    else if (tlv_type == TAG_MEM_CTRL_TLV)
    {
        p_t2t->num_mem_tlvs     = 0;
    }
    else if (tlv_type == TAG_NDEF_TLV)
    {
        p_t2t->ndef_msg_offset  = 0;
        p_t2t->num_lockbytes    = 0;
        p_t2t->num_lock_tlvs    = 0;
        p_t2t->num_mem_tlvs     = 0;
        p_t2t->ndef_msg_len     = 0;
        p_t2t->ndef_status      = T2T_NDEF_NOT_DETECTED;
    }
    else
    {
        p_t2t->prop_msg_len     = 0;
    }

    if (!p_t2t->b_read_hdr)
    {
        /* First read CC block */
        block                   = 0;
        p_t2t->substate         = RW_T2T_SUBSTATE_WAIT_READ_CC;
    }
    else
    {
        /* Read first data block */
        block                   = T2T_FIRST_DATA_BLOCK;
        p_t2t->substate         = RW_T2T_SUBSTATE_WAIT_TLV_DETECT;
    }

    /* Start reading tag, looking for the specified TLV */
    if ((status = rw_t2t_read ((UINT16) block)) == NFC_STATUS_OK)
    {
        p_t2t->state    = RW_T2T_STATE_DETECT_TLV;
    }
    else
    {
        p_t2t->substate = RW_T2T_SUBSTATE_NONE;
    }
    return (status);
}

/*******************************************************************************
**
** Function         RW_T2tDetectNDef
**
** Description      This function is used to perform NDEF detection on a Type 2
**                  tag, and retrieve the tag's NDEF attribute information.
**
**                  Before using this API, the application must call
**                  RW_SelectTagType to indicate that a Type 2 tag has been
**                  activated.
**
** Parameters:      none
**
** Returns          NCI_STATUS_OK,if detect op started.Otherwise,error status.
**
*******************************************************************************/
tNFC_STATUS RW_T2tDetectNDef (BOOLEAN skip_dyn_locks)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;

    p_t2t->skip_dyn_locks = skip_dyn_locks;

    return RW_T2tLocateTlv (TAG_NDEF_TLV);
}

/*******************************************************************************
**
** Function         RW_T2tReadNDef
**
** Description      Retrieve NDEF contents from a Type2 tag.
**
**                  The RW_T2T_NDEF_READ_EVT event is used to notify the
**                  application after reading the NDEF message.
**
**                  Before using this API, the RW_T2tDetectNDef function must
**                  be called to verify that the tag contains NDEF data, and to
**                  retrieve the NDEF attributes.
**
**                  Internally, this command will be separated into multiple Tag2
**                  Read commands (if necessary) - depending on the NDEF Msg size
**
** Parameters:      p_buffer:   The buffer into which to read the NDEF message
**                  buf_len:    The length of the buffer
**
** Returns          NCI_STATUS_OK, if read was started. Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS RW_T2tReadNDef (UINT8 *p_buffer, UINT16 buf_len)
{
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;
    tNFC_STATUS status = NFC_STATUS_OK;
    UINT16      block;

    if (p_t2t->state != RW_T2T_STATE_IDLE)
    {
        RW_TRACE_ERROR1 ("Error: Type 2 tag not activated or Busy - State: %u", p_t2t->state);
        return (NFC_STATUS_FAILED);
    }

    if (p_t2t->ndef_status == T2T_NDEF_NOT_DETECTED)
    {
        RW_TRACE_ERROR0 ("RW_T2tReadNDef - Error: NDEF detection not performed yet");
        return (NFC_STATUS_FAILED);
    }

    if (buf_len < p_t2t->ndef_msg_len)
    {
        RW_TRACE_WARNING2 ("RW_T2tReadNDef - buffer size: %u  less than NDEF msg sise: %u", buf_len, p_t2t->ndef_msg_len);
        return (NFC_STATUS_FAILED);
    }

    if (!p_t2t->ndef_msg_len)
    {
        RW_TRACE_WARNING1 ("RW_T2tReadNDef - NDEF Message length is zero ", p_t2t->ndef_msg_len);
        return (NFC_STATUS_NOT_INITIALIZED);
    }

    p_t2t->p_ndef_buffer  = p_buffer;
    p_t2t->work_offset    = 0;

    block  = (UINT16) (p_t2t->ndef_msg_offset / T2T_BLOCK_LEN);
    block -= block % T2T_READ_BLOCKS;

    p_t2t->substate = RW_T2T_SUBSTATE_NONE;

    if (  (block == T2T_FIRST_DATA_BLOCK)
        &&(p_t2t->b_read_data)  )
    {
        p_t2t->state        = RW_T2T_STATE_READ_NDEF;
        p_t2t->block_read   = T2T_FIRST_DATA_BLOCK;
        rw_t2t_handle_ndef_read_rsp (p_t2t->tag_data);
    }
    else
    {
        /* Start reading NDEF Message */
        if ((status = rw_t2t_read (block)) == NFC_STATUS_OK)
        {
            p_t2t->state    = RW_T2T_STATE_READ_NDEF;
        }
    }

    return (status);
}

/*******************************************************************************
**
** Function         RW_T2tWriteNDef
**
** Description      Write NDEF contents to a Type2 tag.
**
**                  Before using this API, the RW_T2tDetectNDef
**                  function must be called to verify that the tag contains
**                  NDEF data, and to retrieve the NDEF attributes.
**
**                  The RW_T2T_NDEF_WRITE_EVT callback event will be used to
**                  notify the application of the response.
**
**                  Internally, this command will be separated into multiple Tag2
**                  Write commands (if necessary) - depending on the NDEF Msg size
**
** Parameters:      msg_len:    The length of the buffer
**                  p_msg:      The NDEF message to write
**
** Returns          NCI_STATUS_OK,if write was started. Otherwise, error status
**
*******************************************************************************/
tNFC_STATUS RW_T2tWriteNDef (UINT16 msg_len, UINT8 *p_msg)
{
    tRW_T2T_CB  *p_t2t          = &rw_cb.tcb.t2t;
    UINT16      block;
    const       tT2T_INIT_TAG *p_ret;

    tNFC_STATUS status          = NFC_STATUS_OK;

    if (p_t2t->state != RW_T2T_STATE_IDLE)
    {
        RW_TRACE_ERROR1 ("Error: Type 2 tag not activated or Busy - State: %u", p_t2t->state);
        return (NFC_STATUS_FAILED);
    }

    if (p_t2t->ndef_status == T2T_NDEF_NOT_DETECTED)
    {
        RW_TRACE_ERROR0 ("RW_T2tWriteNDef - Error: NDEF detection not performed!");
        return (NFC_STATUS_FAILED);
    }

    if (p_t2t->tag_hdr[T2T_CC3_RWA_BYTE] != T2T_CC3_RWA_RW)
    {
        RW_TRACE_ERROR1 ("RW_T2tWriteNDef - Write access not granted - CC3: %u", p_t2t->tag_hdr[T2T_CC3_RWA_BYTE]);
        return (NFC_STATUS_REFUSED);
    }

    /* Check if there is enough memory on the tag */
    if (msg_len > p_t2t->max_ndef_msg_len)
    {
        RW_TRACE_ERROR1 ("RW_T2tWriteNDef - Cannot write NDEF of size greater than %u bytes", p_t2t->max_ndef_msg_len);
        return (NFC_STATUS_FAILED);
    }

    /* If OTP tag and tag has valid NDEF Message, stop writting new NDEF Message as it may corrupt the tag */
    if (  (p_t2t->ndef_msg_len > 0)
        &&((p_ret = t2t_tag_init_data (p_t2t->tag_hdr[0], FALSE, 0)) != NULL)
        &&(p_ret->b_otp)  )
    {
        RW_TRACE_WARNING0 ("RW_T2tWriteNDef - Cannot Overwrite NDEF Message on a OTP tag!");
        return (NFC_STATUS_FAILED);
    }
    p_t2t->p_new_ndef_buffer = p_msg;
    p_t2t->new_ndef_msg_len  = msg_len;
    p_t2t->work_offset       = 0;

    p_t2t->substate = RW_T2T_SUBSTATE_WAIT_READ_NDEF_FIRST_BLOCK;
    /* Read first NDEF Block before updating NDEF */

    block = (UINT16) (p_t2t->ndef_header_offset / T2T_BLOCK_LEN);

    if (  (block < (T2T_FIRST_DATA_BLOCK + T2T_READ_BLOCKS))
        &&(p_t2t->b_read_data)  )
    {
        p_t2t->state        = RW_T2T_STATE_WRITE_NDEF;
        p_t2t->block_read   = block;
        rw_t2t_handle_ndef_write_rsp (&p_t2t->tag_data[(block - T2T_FIRST_DATA_BLOCK) * T2T_BLOCK_LEN]);
    }
    else
    {
        if ((status = rw_t2t_read (block)) == NFC_STATUS_OK)
            p_t2t->state    = RW_T2T_STATE_WRITE_NDEF;
        else
            p_t2t->substate = RW_T2T_SUBSTATE_NONE;
    }

    return status;
}

/*******************************************************************************
**
** Function         RW_T2tSetTagReadOnly
**
** Description      This function can be called to set T2 tag as read only.
**
** Parameters:      b_hard_lock:   To indicate hard lock the tag or not
**
** Returns          NCI_STATUS_OK, if setting tag as read only was started.
**                  Otherwise, error status.
**
*******************************************************************************/
tNFC_STATUS RW_T2tSetTagReadOnly (BOOLEAN b_hard_lock)
{
    tNFC_STATUS status = NFC_STATUS_FAILED;
    tRW_T2T_CB  *p_t2t = &rw_cb.tcb.t2t;

    if (p_t2t->state != RW_T2T_STATE_IDLE)
    {
        RW_TRACE_ERROR1 ("RW_T2tSetTagReadOnly: Error: Type 2 tag not activated or Busy - State: %u", p_t2t->state);
        return (NFC_STATUS_FAILED);
    }

    p_t2t->b_hard_lock = b_hard_lock;

    if (!p_t2t->b_read_hdr)
    {
        /* Read CC block before configuring tag as Read only */
        p_t2t->substate    = RW_T2T_SUBSTATE_WAIT_READ_CC;
        if ((status = rw_t2t_read ((UINT16) 0)) == NFC_STATUS_OK)
        {
            p_t2t->state    = RW_T2T_STATE_SET_TAG_RO;
        }
        else
            p_t2t->substate = RW_T2T_SUBSTATE_NONE;
    }
    else
    {
        if ((status = rw_t2t_soft_lock_tag ()) != NFC_STATUS_OK)
            p_t2t->b_read_hdr = FALSE;
    }

    return status;
}

#endif /* (defined ((RW_NDEF_INCLUDED) && (RW_NDEF_INCLUDED == TRUE)) */

#endif /* (NFC_INCLUDED == TRUE) */