xref: /system/bt/stack/sdp/sdp_utils.cc

/******************************************************************************
 *
 *  Copyright (C) 1999-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This file contains SDP utility functions
 *
 ******************************************************************************/

#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <stdio.h>

#include "bt_common.h"
#include "bt_types.h"

#include "l2cdefs.h"
#include "hcidefs.h"
#include "hcimsgs.h"

#include "sdp_api.h"
#include "sdpint.h"

#include "btu.h"


static const uint8_t sdp_base_uuid[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
                                        0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB};

/*******************************************************************************
 *
 * Function         sdpu_find_ccb_by_cid
 *
 * Description      This function searches the CCB table for an entry with the
 *                  passed CID.
 *
 * Returns          the CCB address, or NULL if not found.
 *
 ******************************************************************************/
tCONN_CB *sdpu_find_ccb_by_cid (uint16_t cid)
{
    uint16_t     xx;
    tCONN_CB     *p_ccb;

    /* Look through each connection control block */
    for (xx = 0, p_ccb = sdp_cb.ccb; xx < SDP_MAX_CONNECTIONS; xx++, p_ccb++)
    {
        if ((p_ccb->con_state != SDP_STATE_IDLE) && (p_ccb->connection_id == cid))
            return (p_ccb);
    }

    /* If here, not found */
    return (NULL);
}


/*******************************************************************************
 *
 * Function         sdpu_find_ccb_by_db
 *
 * Description      This function searches the CCB table for an entry with the
 *                  passed discovery db.
 *
 * Returns          the CCB address, or NULL if not found.
 *
 ******************************************************************************/
tCONN_CB *sdpu_find_ccb_by_db (tSDP_DISCOVERY_DB *p_db)
{
#if (SDP_CLIENT_ENABLED == TRUE)
    uint16_t     xx;
    tCONN_CB     *p_ccb;

    if (p_db)
    {
        /* Look through each connection control block */
        for (xx = 0, p_ccb = sdp_cb.ccb; xx < SDP_MAX_CONNECTIONS; xx++, p_ccb++)
        {
            if ((p_ccb->con_state != SDP_STATE_IDLE) && (p_ccb->p_db == p_db))
                return (p_ccb);
        }
    }
#endif
    /* If here, not found */
    return (NULL);
}


/*******************************************************************************
 *
 * Function         sdpu_allocate_ccb
 *
 * Description      This function allocates a new CCB.
 *
 * Returns          CCB address, or NULL if none available.
 *
 ******************************************************************************/
tCONN_CB *sdpu_allocate_ccb (void)
{
    uint16_t     xx;
    tCONN_CB     *p_ccb;

    /* Look through each connection control block for a free one */
    for (xx = 0, p_ccb = sdp_cb.ccb; xx < SDP_MAX_CONNECTIONS; xx++, p_ccb++)
    {
        if (p_ccb->con_state == SDP_STATE_IDLE)
        {
            memset(p_ccb, 0, sizeof(tCONN_CB));
            p_ccb->sdp_conn_timer = alarm_new("sdp.sdp_conn_timer");
            return (p_ccb);
        }
    }

    /* If here, no free CCB found */
    return (NULL);
}


/*******************************************************************************
 *
 * Function         sdpu_release_ccb
 *
 * Description      This function releases a CCB.
 *
 * Returns          void
 *
 ******************************************************************************/
void sdpu_release_ccb (tCONN_CB *p_ccb)
{
    /* Ensure timer is stopped */
    alarm_free(p_ccb->sdp_conn_timer);
    p_ccb->sdp_conn_timer = NULL;

    /* Drop any response pointer we may be holding */
    p_ccb->con_state = SDP_STATE_IDLE;
#if (SDP_CLIENT_ENABLED == TRUE)
    p_ccb->is_attr_search = false;
#endif

    /* Free the response buffer */
    if (p_ccb->rsp_list)
        SDP_TRACE_DEBUG("releasing SDP rsp_list");
    osi_free_and_reset((void **)&p_ccb->rsp_list);
}


/*******************************************************************************
 *
 * Function         sdpu_build_attrib_seq
 *
 * Description      This function builds an attribute sequence from the list of
 *                  passed attributes. It is also passed the address of the
 *                  output buffer.
 *
 * Returns          Pointer to next byte in the output buffer.
 *
 ******************************************************************************/
uint8_t *sdpu_build_attrib_seq (uint8_t *p_out, uint16_t *p_attr, uint16_t num_attrs)
{
    uint16_t xx;

    /* First thing is the data element header. See if the length fits 1 byte */
    /* If no attributes, assume a 4-byte wildcard */
    if (!p_attr)
        xx = 5;
    else
        xx = num_attrs * 3;

    if (xx > 255)
    {
        UINT8_TO_BE_STREAM  (p_out, (DATA_ELE_SEQ_DESC_TYPE << 3) | SIZE_IN_NEXT_WORD);
        UINT16_TO_BE_STREAM (p_out, xx);
    }
    else
    {
        UINT8_TO_BE_STREAM (p_out, (DATA_ELE_SEQ_DESC_TYPE << 3) | SIZE_IN_NEXT_BYTE);
        UINT8_TO_BE_STREAM (p_out, xx);
    }

    /* If there are no attributes specified, assume caller wants wildcard */
    if (!p_attr)
    {
        UINT8_TO_BE_STREAM  (p_out, (UINT_DESC_TYPE << 3) | SIZE_FOUR_BYTES);
        UINT16_TO_BE_STREAM (p_out, 0);
        UINT16_TO_BE_STREAM (p_out, 0xFFFF);
    }
    else
    {
        /* Loop through and put in all the attributes(s) */
        for (xx = 0; xx < num_attrs; xx++, p_attr++)
        {
            UINT8_TO_BE_STREAM  (p_out, (UINT_DESC_TYPE << 3) | SIZE_TWO_BYTES);
            UINT16_TO_BE_STREAM (p_out, *p_attr);
        }
    }

    return (p_out);
}


/*******************************************************************************
 *
 * Function         sdpu_build_attrib_entry
 *
 * Description      This function builds an attribute entry from the passed
 *                  attribute record. It is also passed the address of the
 *                  output buffer.
 *
 * Returns          Pointer to next byte in the output buffer.
 *
 ******************************************************************************/
uint8_t *sdpu_build_attrib_entry (uint8_t *p_out, tSDP_ATTRIBUTE *p_attr)
{
    /* First, store the attribute ID. Goes as a UINT */
    UINT8_TO_BE_STREAM  (p_out, (UINT_DESC_TYPE << 3) | SIZE_TWO_BYTES);
    UINT16_TO_BE_STREAM (p_out, p_attr->id);

    /* the attribute is in the db record.
     * assuming the attribute len is less than SDP_MAX_ATTR_LEN */
    switch(p_attr->type)
    {
    case TEXT_STR_DESC_TYPE:    /* 4 */
    case DATA_ELE_SEQ_DESC_TYPE:/* 6 */
    case DATA_ELE_ALT_DESC_TYPE:/* 7 */
    case URL_DESC_TYPE:         /* 8 */
#if (SDP_MAX_ATTR_LEN > 0xFFFF)
        if(p_attr->len > 0xFFFF)
        {
            UINT8_TO_BE_STREAM (p_out, (p_attr->type << 3) | SIZE_IN_NEXT_LONG);
            UINT32_TO_BE_STREAM (p_out, p_attr->len);
        }
        else

#endif /* 0xFFFF - 0xFF */
#if (SDP_MAX_ATTR_LEN > 0xFF)
        if(p_attr->len > 0xFF)
        {
            UINT8_TO_BE_STREAM (p_out, (p_attr->type << 3) | SIZE_IN_NEXT_WORD);
            UINT16_TO_BE_STREAM (p_out, p_attr->len);
        }
        else

#endif /* 0xFF and less*/
        {
            UINT8_TO_BE_STREAM (p_out, (p_attr->type << 3) | SIZE_IN_NEXT_BYTE);
            UINT8_TO_BE_STREAM (p_out, p_attr->len);
        }

        if (p_attr->value_ptr != NULL) {
            ARRAY_TO_BE_STREAM (p_out, p_attr->value_ptr, (int)p_attr->len);
        }

        return (p_out);
    }

    /* Now, store the attribute value */
    switch (p_attr->len)
    {
    case 1:
        UINT8_TO_BE_STREAM (p_out, (p_attr->type << 3) | SIZE_ONE_BYTE);
        break;
    case 2:
        UINT8_TO_BE_STREAM  (p_out, (p_attr->type << 3) | SIZE_TWO_BYTES);
        break;
    case 4:
        UINT8_TO_BE_STREAM  (p_out, (p_attr->type << 3) | SIZE_FOUR_BYTES);
        break;
    case 8:
        UINT8_TO_BE_STREAM  (p_out, (p_attr->type << 3) | SIZE_EIGHT_BYTES);
        break;
    case 16:
        UINT8_TO_BE_STREAM  (p_out, (p_attr->type << 3) | SIZE_SIXTEEN_BYTES);
        break;
    default:
        UINT8_TO_BE_STREAM (p_out, (p_attr->type << 3) | SIZE_IN_NEXT_BYTE);
        UINT8_TO_BE_STREAM (p_out, p_attr->len);
        break;
    }

    if (p_attr->value_ptr != NULL) {
        ARRAY_TO_BE_STREAM (p_out, p_attr->value_ptr, (int)p_attr->len);
    }

    return (p_out);
}


/*******************************************************************************
 *
 * Function         sdpu_build_n_send_error
 *
 * Description      This function builds and sends an error packet.
 *
 * Returns          void
 *
 ******************************************************************************/
void sdpu_build_n_send_error (tCONN_CB *p_ccb, uint16_t trans_num, uint16_t error_code, char *p_error_text)
{
    uint8_t         *p_rsp, *p_rsp_start, *p_rsp_param_len;
    uint16_t        rsp_param_len;
    BT_HDR          *p_buf = (BT_HDR *)osi_malloc(SDP_DATA_BUF_SIZE);


    SDP_TRACE_WARNING ("SDP - sdpu_build_n_send_error  code: 0x%x  CID: 0x%x",
                        error_code, p_ccb->connection_id);

    /* Send the packet to L2CAP */
    p_buf->offset = L2CAP_MIN_OFFSET;
    p_rsp = p_rsp_start = (uint8_t *)(p_buf + 1) + L2CAP_MIN_OFFSET;

    UINT8_TO_BE_STREAM(p_rsp, SDP_PDU_ERROR_RESPONSE);
    UINT16_TO_BE_STREAM(p_rsp, trans_num);

    /* Skip the parameter length, we need to add it at the end */
    p_rsp_param_len = p_rsp;
    p_rsp += 2;

    UINT16_TO_BE_STREAM  (p_rsp, error_code);

    /* Unplugfest example traces do not have any error text */
    if (p_error_text)
        ARRAY_TO_BE_STREAM(p_rsp, p_error_text, (int)strlen(p_error_text));

    /* Go back and put the parameter length into the buffer */
    rsp_param_len = p_rsp - p_rsp_param_len - 2;
    UINT16_TO_BE_STREAM(p_rsp_param_len, rsp_param_len);

    /* Set the length of the SDP data in the buffer */
    p_buf->len = p_rsp - p_rsp_start;

    /* Send the buffer through L2CAP */
    L2CA_DataWrite(p_ccb->connection_id, p_buf);
}



/*******************************************************************************
 *
 * Function         sdpu_extract_uid_seq
 *
 * Description      This function extracts a UUID sequence from the passed input
 *                  buffer, and puts it into the passed output list.
 *
 * Returns          Pointer to next byte in the input buffer after the sequence.
 *
 ******************************************************************************/
uint8_t *sdpu_extract_uid_seq (uint8_t *p, uint16_t param_len, tSDP_UUID_SEQ *p_seq)
{
    uint8_t *p_seq_end;
    uint8_t descr, type, size;
    uint32_t seq_len, uuid_len;

    /* Assume none found */
    p_seq->num_uids = 0;

    /* A UID sequence is composed of a bunch of UIDs. */

    BE_STREAM_TO_UINT8 (descr, p);
    type = descr >> 3;
    size = descr & 7;

    if (type != DATA_ELE_SEQ_DESC_TYPE)
        return (NULL);

    switch (size)
    {
    case SIZE_TWO_BYTES:
        seq_len = 2;
        break;
    case SIZE_FOUR_BYTES:
        seq_len = 4;
        break;
    case SIZE_SIXTEEN_BYTES:
        seq_len = 16;
        break;
    case SIZE_IN_NEXT_BYTE:
        BE_STREAM_TO_UINT8 (seq_len, p);
        break;
    case SIZE_IN_NEXT_WORD:
        BE_STREAM_TO_UINT16 (seq_len, p);
        break;
    case SIZE_IN_NEXT_LONG:
        BE_STREAM_TO_UINT32 (seq_len, p);
        break;
    default:
        return (NULL);
    }

    if (seq_len >= param_len)
        return (NULL);

    p_seq_end = p + seq_len;

    /* Loop through, extracting the UIDs */
    for ( ; p < p_seq_end ; )
    {
        BE_STREAM_TO_UINT8 (descr, p);
        type = descr >> 3;
        size = descr & 7;

        if (type != UUID_DESC_TYPE)
            return (NULL);

        switch (size)
        {
        case SIZE_TWO_BYTES:
            uuid_len = 2;
            break;
        case SIZE_FOUR_BYTES:
            uuid_len = 4;
            break;
        case SIZE_SIXTEEN_BYTES:
            uuid_len = 16;
            break;
        case SIZE_IN_NEXT_BYTE:
            BE_STREAM_TO_UINT8 (uuid_len, p);
            break;
        case SIZE_IN_NEXT_WORD:
            BE_STREAM_TO_UINT16 (uuid_len, p);
            break;
        case SIZE_IN_NEXT_LONG:
            BE_STREAM_TO_UINT32 (uuid_len, p);
            break;
        default:
            return (NULL);
        }

        /* If UUID length is valid, copy it across */
        if ((uuid_len == 2) || (uuid_len == 4) || (uuid_len == 16))
        {
            p_seq->uuid_entry[p_seq->num_uids].len = (uint16_t) uuid_len;
            BE_STREAM_TO_ARRAY (p, p_seq->uuid_entry[p_seq->num_uids].value, (int)uuid_len);
            p_seq->num_uids++;
        }
        else
            return (NULL);

        /* We can only do so many */
        if (p_seq->num_uids >= MAX_UUIDS_PER_SEQ)
            return (NULL);
    }

    if (p != p_seq_end)
        return (NULL);

    return (p);
}



/*******************************************************************************
 *
 * Function         sdpu_extract_attr_seq
 *
 * Description      This function extracts an attribute sequence from the passed
 *                  input buffer, and puts it into the passed output list.
 *
 * Returns          Pointer to next byte in the input buffer after the sequence.
 *
 ******************************************************************************/
uint8_t *sdpu_extract_attr_seq (uint8_t *p, uint16_t param_len, tSDP_ATTR_SEQ *p_seq)
{
    uint8_t *p_end_list;
    uint8_t descr, type, size;
    uint32_t list_len, attr_len;

    /* Assume none found */
    p_seq->num_attr = 0;

    /* Get attribute sequence info */
    BE_STREAM_TO_UINT8 (descr, p);
    type = descr >> 3;
    size = descr & 7;

    if (type != DATA_ELE_SEQ_DESC_TYPE)
        return (p);

    switch (size)
    {
    case SIZE_IN_NEXT_BYTE:
        BE_STREAM_TO_UINT8 (list_len, p);
        break;

    case SIZE_IN_NEXT_WORD:
        BE_STREAM_TO_UINT16 (list_len, p);
        break;

    case SIZE_IN_NEXT_LONG:
        BE_STREAM_TO_UINT32 (list_len, p);
        break;

    default:
        return (p);
    }

    if (list_len > param_len)
        return (p);

    p_end_list = p + list_len;

    /* Loop through, extracting the attribute IDs */
    for ( ; p < p_end_list ; )
    {
        BE_STREAM_TO_UINT8 (descr, p);
        type = descr >> 3;
        size = descr & 7;

        if (type != UINT_DESC_TYPE)
            return (p);

        switch (size)
        {
        case SIZE_TWO_BYTES:
            attr_len = 2;
            break;
        case SIZE_FOUR_BYTES:
            attr_len = 4;
            break;
        case SIZE_IN_NEXT_BYTE:
            BE_STREAM_TO_UINT8 (attr_len, p);
            break;
        case SIZE_IN_NEXT_WORD:
            BE_STREAM_TO_UINT16 (attr_len, p);
            break;
        case SIZE_IN_NEXT_LONG:
            BE_STREAM_TO_UINT32 (attr_len, p);
            break;
        default:
            return (NULL);
            break;
        }

        /* Attribute length must be 2-bytes or 4-bytes for a paired entry. */
        if (attr_len == 2)
        {
            BE_STREAM_TO_UINT16 (p_seq->attr_entry[p_seq->num_attr].start, p);
            p_seq->attr_entry[p_seq->num_attr].end = p_seq->attr_entry[p_seq->num_attr].start;
        }
        else if (attr_len == 4)
        {
            BE_STREAM_TO_UINT16 (p_seq->attr_entry[p_seq->num_attr].start, p);
            BE_STREAM_TO_UINT16 (p_seq->attr_entry[p_seq->num_attr].end, p);
        }
        else
            return (NULL);

        /* We can only do so many */
        if (++p_seq->num_attr >= MAX_ATTR_PER_SEQ)
            return (NULL);
    }

    return (p);
}


/*******************************************************************************
 *
 * Function         sdpu_get_len_from_type
 *
 * Description      This function gets the length
 *
 * Returns          void
 *
 ******************************************************************************/
uint8_t *sdpu_get_len_from_type (uint8_t *p, uint8_t type, uint32_t *p_len)
{
    uint8_t u8;
    uint16_t u16;
    uint32_t u32;

    switch (type & 7)
    {
    case SIZE_ONE_BYTE:
        *p_len = 1;
        break;
    case SIZE_TWO_BYTES:
        *p_len = 2;
        break;
    case SIZE_FOUR_BYTES:
        *p_len = 4;
        break;
    case SIZE_EIGHT_BYTES:
        *p_len = 8;
        break;
    case SIZE_SIXTEEN_BYTES:
        *p_len = 16;
        break;
    case SIZE_IN_NEXT_BYTE:
        BE_STREAM_TO_UINT8 (u8, p);
        *p_len = u8;
        break;
    case SIZE_IN_NEXT_WORD:
        BE_STREAM_TO_UINT16 (u16, p);
        *p_len = u16;
        break;
    case SIZE_IN_NEXT_LONG:
        BE_STREAM_TO_UINT32 (u32, p);
        *p_len = (uint16_t) u32;
        break;
    }

    return (p);
}


/*******************************************************************************
 *
 * Function         sdpu_is_base_uuid
 *
 * Description      This function checks a 128-bit UUID with the base to see if
 *                  it matches. Only the last 12 bytes are compared.
 *
 * Returns          true if matched, else false
 *
 ******************************************************************************/
bool    sdpu_is_base_uuid (uint8_t *p_uuid)
{
    uint16_t  xx;

    for (xx = 4; xx < MAX_UUID_SIZE; xx++)
        if (p_uuid[xx] != sdp_base_uuid[xx])
            return (false);

    /* If here, matched */
    return (true);
}


/*******************************************************************************
 *
 * Function         sdpu_compare_uuid_arrays
 *
 * Description      This function compares 2 BE UUIDs. If needed, they are
 *                  expanded to 128-bit UUIDs, then compared.
 *
 * NOTE             it is assumed that the arrays are in Big Endian format
 *
 * Returns          true if matched, else false
 *
 ******************************************************************************/
bool    sdpu_compare_uuid_arrays (uint8_t *p_uuid1, uint32_t len1, uint8_t *p_uuid2, uint16_t len2)
{
    uint8_t     nu1[MAX_UUID_SIZE];
    uint8_t     nu2[MAX_UUID_SIZE];

    if( ((len1 != 2) && (len1 != 4) && (len1 != 16)) ||
        ((len2 != 2) && (len2 != 4) && (len2 != 16)) )
    {
        SDP_TRACE_ERROR("%s: invalid length", __func__);
        return false;
    }

    /* If lengths match, do a straight compare */
    if (len1 == len2)
    {
        if (len1 == 2)
            return ((p_uuid1[0] == p_uuid2[0]) && (p_uuid1[1] == p_uuid2[1]));
        if (len1 == 4)
            return (  (p_uuid1[0] == p_uuid2[0]) && (p_uuid1[1] == p_uuid2[1])
                   && (p_uuid1[2] == p_uuid2[2]) && (p_uuid1[3] == p_uuid2[3]) );
        else
            return (memcmp (p_uuid1, p_uuid2, (size_t)len1) == 0);
    }
    else if (len1 > len2)
    {
        /* If the len1 was 4-byte, (so len2 is 2-byte), compare on the fly */
        if (len1 == 4)
        {
            return ( (p_uuid1[0] == 0) && (p_uuid1[1] == 0)
                  && (p_uuid1[2] == p_uuid2[0]) && (p_uuid1[3] == p_uuid2[1]) );
        }
        else
        {
            /* Normalize UUIDs to 16-byte form, then compare. Len1 must be 16 */
            memcpy (nu1, p_uuid1,       MAX_UUID_SIZE);
            memcpy (nu2, sdp_base_uuid, MAX_UUID_SIZE);

            if (len2 == 4)
                memcpy (nu2, p_uuid2, len2);
            else if (len2 == 2)
                memcpy (nu2 + 2, p_uuid2, len2);

            return (memcmp (nu1, nu2, MAX_UUID_SIZE) == 0);
        }
    }
    else
    {
        /* len2 is greater than len1 */
        /* If the len2 was 4-byte, (so len1 is 2-byte), compare on the fly */
        if (len2 == 4)
        {
            return ( (p_uuid2[0] == 0) && (p_uuid2[1] == 0)
                  && (p_uuid2[2] == p_uuid1[0]) && (p_uuid2[3] == p_uuid1[1]) );
        }
        else
        {
            /* Normalize UUIDs to 16-byte form, then compare. Len1 must be 16 */
            memcpy (nu2, p_uuid2,       MAX_UUID_SIZE);
            memcpy (nu1, sdp_base_uuid, MAX_UUID_SIZE);

            if (len1 == 4)
                memcpy (nu1, p_uuid1, (size_t)len1);
            else if (len1 == 2)
                memcpy (nu1 + 2, p_uuid1, (size_t)len1);

            return (memcmp (nu1, nu2, MAX_UUID_SIZE) == 0);
        }
    }
}


/*******************************************************************************
 *
 * Function         sdpu_compare_bt_uuids
 *
 * Description      This function compares 2 BT UUID structures.
 *
 * NOTE             it is assumed that BT UUID structures are compressed to the
 *                  smallest possible UUIDs (by removing the base SDP UUID)
 *
 * Returns          true if matched, else false
 *
 ******************************************************************************/
bool    sdpu_compare_bt_uuids (tBT_UUID *p_uuid1, tBT_UUID *p_uuid2)
{
    /* Lengths must match for BT UUIDs to match */
    if (p_uuid1->len == p_uuid2->len)
    {
        if (p_uuid1->len == 2)
            return (p_uuid1->uu.uuid16 == p_uuid2->uu.uuid16);
        else if (p_uuid1->len == 4)
            return (p_uuid1->uu.uuid32 == p_uuid2->uu.uuid32);
        else if (!memcmp (p_uuid1->uu.uuid128, p_uuid2->uu.uuid128, 16))
            return (true);
    }

    return (false);
}


/*******************************************************************************
 *
 * Function         sdpu_compare_uuid_with_attr
 *
 * Description      This function compares a BT UUID structure with the UUID in
 *                  an SDP attribute record. If needed, they are expanded to
 *                  128-bit UUIDs, then compared.
 *
 * NOTE           - it is assumed that BT UUID structures are compressed to the
 *                  smallest possible UUIDs (by removing the base SDP UUID).
 *                - it is also assumed that the discovery atribute is compressed
 *                  to the smallest possible
 *
 * Returns          true if matched, else false
 *
 ******************************************************************************/
bool    sdpu_compare_uuid_with_attr (tBT_UUID *p_btuuid, tSDP_DISC_ATTR *p_attr)
{
    uint16_t    attr_len = SDP_DISC_ATTR_LEN (p_attr->attr_len_type);

    /* Since both UUIDs are compressed, lengths must match  */
    if (p_btuuid->len != attr_len)
        return (false);

    if (p_btuuid->len == 2)
        return (bool   )(p_btuuid->uu.uuid16 == p_attr->attr_value.v.u16);
    else if (p_btuuid->len == 4)
        return (bool   )(p_btuuid->uu.uuid32 == p_attr->attr_value.v.u32);
    /* coverity[overrun-buffer-arg] */
    /*
       Event overrun-buffer-arg: Overrun of static array "&p_attr->attr_value.v.array" of size 4 bytes by passing it to a function which indexes it with argument "16U" at byte position 15
       false-POSITIVE error from Coverity test tool. Please do NOT remove following comment.
       False-positive: SDP uses scratch buffer to hold the attribute value.
       The actual size of tSDP_DISC_ATVAL does not matter.
       If the array size in tSDP_DISC_ATVAL is increase, we would increase the system RAM usage unnecessarily
    */
    else if (!memcmp (p_btuuid->uu.uuid128,(void*) p_attr->attr_value.v.array, MAX_UUID_SIZE))
        return (true);

    return (false);
}

/*******************************************************************************
 *
 * Function         sdpu_sort_attr_list
 *
 * Description      sorts a list of attributes in numeric order from lowest to
 *                  highest to conform to SDP specification
 *
 * Returns          void
 *
 ******************************************************************************/
void sdpu_sort_attr_list( uint16_t num_attr, tSDP_DISCOVERY_DB *p_db )
{
    uint16_t i;
    uint16_t x;

    /* Done if no attributes to sort */
    if (num_attr <= 1)
    {
        return;
    }
    else if (num_attr > SDP_MAX_ATTR_FILTERS)
    {
        num_attr = SDP_MAX_ATTR_FILTERS;
    }

    num_attr--; /* for the for-loop */
    for( i = 0; i < num_attr; )
    {
        if( p_db->attr_filters[i] > p_db->attr_filters[i+1] )
        {
            /* swap the attribute IDs and start from the beginning */
            x = p_db->attr_filters[i];
            p_db->attr_filters[i] = p_db->attr_filters[i+1];
            p_db->attr_filters[i+1] = x;

            i = 0;
        }
        else
            i++;
    }
}


/*******************************************************************************
 *
 * Function         sdpu_get_list_len
 *
 * Description      gets the total list length in the sdp database for a given
 *                  uid sequence and attr sequence
 *
 * Returns          void
 *
 ******************************************************************************/
uint16_t sdpu_get_list_len(tSDP_UUID_SEQ *uid_seq, tSDP_ATTR_SEQ *attr_seq)
{
    tSDP_RECORD    *p_rec;
    uint16_t len = 0;
    uint16_t len1;

    for (p_rec = sdp_db_service_search (NULL, uid_seq); p_rec; p_rec = sdp_db_service_search (p_rec, uid_seq))
    {
        len += 3;

        len1 = sdpu_get_attrib_seq_len(p_rec, attr_seq );

        if (len1 != 0)
            len += len1;
        else
            len -= 3;
    }
    return len;
}

/*******************************************************************************
 *
 * Function         sdpu_get_attrib_seq_len
 *
 * Description      gets the length of the specific attributes in a given
 *                  sdp record
 *
 * Returns          void
 *
 ******************************************************************************/
uint16_t sdpu_get_attrib_seq_len(tSDP_RECORD *p_rec, tSDP_ATTR_SEQ *attr_seq)
{
    tSDP_ATTRIBUTE *p_attr;
    uint16_t len1 = 0;
    uint16_t xx;
    bool    is_range = false;
    uint16_t start_id=0, end_id=0;

    for (xx = 0; xx < attr_seq->num_attr; xx++)
    {
        if (is_range == false)
        {
            start_id = attr_seq->attr_entry[xx].start;
            end_id = attr_seq->attr_entry[xx].end;
        }
        p_attr = sdp_db_find_attr_in_rec (p_rec,
                                          start_id,
                                          end_id);
        if (p_attr)
        {
            len1 += sdpu_get_attrib_entry_len (p_attr);

            /* If doing a range, stick with this one till no more attributes found */
            if (start_id != end_id)
            {
                /* Update for next time through */
                start_id = p_attr->id + 1;
                xx--;
                is_range = true;
            }
            else
                is_range = false;
        }
        else
            is_range = false;
    }
    return len1;
}

/*******************************************************************************
 *
 * Function         sdpu_get_attrib_entry_len
 *
 * Description      gets the length of a specific attribute
 *
 * Returns          void
 *
 ******************************************************************************/
uint16_t sdpu_get_attrib_entry_len(tSDP_ATTRIBUTE *p_attr)
{
    uint16_t len = 3;

    /* the attribute is in the db record.
     * assuming the attribute len is less than SDP_MAX_ATTR_LEN */
    switch(p_attr->type)
    {
    case TEXT_STR_DESC_TYPE:    /* 4 */
    case DATA_ELE_SEQ_DESC_TYPE:/* 6 */
    case DATA_ELE_ALT_DESC_TYPE:/* 7 */
    case URL_DESC_TYPE:         /* 8 */
#if (SDP_MAX_ATTR_LEN > 0xFFFF)
        if(p_attr->len > 0xFFFF)
        {
            len += 5;
        }
        else

#endif/* 0xFFFF - 0xFF */
#if (SDP_MAX_ATTR_LEN > 0xFF)
        if(p_attr->len > 0xFF)
        {
            len += 3;
        }
        else

#endif /* 0xFF and less*/
        {
            len += 2;
        }
        len += p_attr->len;
        return len;
	}

    /* Now, the attribute value */
    switch (p_attr->len)
    {
    case 1:
    case 2:
    case 4:
    case 8:
    case 16:
        len += 1;
        break;
    default:
        len += 2;
        break;
    }

    len += p_attr->len;
    return len;
}


/*******************************************************************************
 *
 * Function         sdpu_build_partial_attrib_entry
 *
 * Description      This function fills a buffer with partial attribute. It is
 *                  assumed that the maximum size of any attribute is 256 bytes.
 *
 *                  p_out: output buffer
 *                  p_attr: attribute to be copied partially into p_out
 *                  rem_len: num bytes to copy into p_out
 *                  offset: current start offset within the attr that needs to
 *                          be copied
 *
 * Returns          Pointer to next byte in the output buffer.
 *                  offset is also updated
 *
 ******************************************************************************/
uint8_t *sdpu_build_partial_attrib_entry (uint8_t *p_out, tSDP_ATTRIBUTE *p_attr, uint16_t len, uint16_t *offset)
{
    uint8_t *p_attr_buff = (uint8_t *)osi_malloc(sizeof(uint8_t) * SDP_MAX_ATTR_LEN);
    sdpu_build_attrib_entry(p_attr_buff, p_attr);

    uint16_t attr_len = sdpu_get_attrib_entry_len(p_attr);

    if (len > SDP_MAX_ATTR_LEN)
    {
        SDP_TRACE_ERROR("%s len %d exceeds SDP_MAX_ATTR_LEN", __func__, len);
        len = SDP_MAX_ATTR_LEN;
    }

    size_t len_to_copy = ((attr_len - *offset) < len) ? (attr_len - *offset) : len;
    memcpy(p_out, &p_attr_buff[*offset], len_to_copy);

    p_out = &p_out[len_to_copy];
    *offset += len_to_copy;

    osi_free(p_attr_buff);
    return p_out;
}

/*******************************************************************************
 *
 * Function         sdpu_uuid16_to_uuid128
 *
 * Description      This function converts UUID-16 to UUID-128 by including the
 *                  base UUID
 *
 *                  uuid16: 2-byte UUID
 *                  p_uuid128: Expanded 128-bit UUID
 *
 * Returns          None
 *
 ******************************************************************************/
void sdpu_uuid16_to_uuid128(uint16_t uuid16, uint8_t* p_uuid128)
{
    uint16_t uuid16_bo;
    memset(p_uuid128, 0, 16);

    memcpy(p_uuid128, sdp_base_uuid, MAX_UUID_SIZE);
    uuid16_bo = ntohs(uuid16);
    memcpy(p_uuid128+ 2, &uuid16_bo, sizeof(uint16_t));
}