File content as of revision 294:ab928e365ea1:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * 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.
 */

#include <string.h>

#include "UUID.h"

UUID::UUID(ShortUUIDBytes_t shortUUID) : type(UUID_TYPE_SHORT), baseUUID(), shortUUID(shortUUID) {
    /* empty */
}

/**************************************************************************/
/*!
    @brief  Creates a new 128-bit UUID

    @note   The UUID is a unique 128-bit (16 byte) ID used to identify
            different service or characteristics on the BLE device.

    @note   When creating a UUID, the constructor will check if all bytes
            except bytes 2/3 are equal to 0.  If only bytes 2/3 have a
            value, the UUID will be treated as a short/BLE UUID, and the
            .type field will be set to UUID::UUID_TYPE_SHORT.  If any
            of the bytes outside byte 2/3 have a non-zero value, the UUID
            will be considered a 128-bit ID, and .type will be assigned
            as UUID::UUID_TYPE_LONG.

    @param[in]  uuid_base
                The 128-bit (16-byte) UUID value.  For 128-bit values,
                assign all 16 bytes.  For 16-bit values, assign the
                16-bits to byte 2 and 3, and leave the rest of the bytes
                as 0.

    @section EXAMPLE

    @code

    // Create a short UUID (0x180F)
    uint8_t shortID[16] = { 0, 0, 0x0F, 0x18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    UUID ble_uuid = UUID(shortID);
    // ble_uuid.type  = UUID_TYPE_SHORT
    // ble_uuid.value = 0x180F

    // Creeate a long UUID
    uint8_t longID[16] = { 0x00, 0x11, 0x22, 0x33,
                           0x44, 0x55, 0x66, 0x77,
                           0x88, 0x99, 0xAA, 0xBB,
                           0xCC, 0xDD, 0xEE, 0xFF };
    UUID custom_uuid = UUID(longID);
    // custom_uuid.type  = UUID_TYPE_LONG
    // custom_uuid.value = 0x3322
    // custom_uuid.base  = 00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF

    @endcode
*/
/**************************************************************************/
UUID::UUID(const LongUUIDBytes_t longUUID) : type(UUID_TYPE_SHORT), baseUUID(), shortUUID(0)
{
    memcpy(baseUUID, longUUID, LENGTH_OF_LONG_UUID);
    shortUUID = (uint16_t)((longUUID[2] << 8) | (longUUID[3]));

    /* Check if this is a short of a long UUID */
    unsigned index;
    for (index = 0; index < LENGTH_OF_LONG_UUID; index++) {
        if ((index == 2) || (index == 3)) {
            continue; /* we should not consider bytes 2 and 3 because that's
                       * where the 16-bit relative UUID is placed. */
        }

        if (baseUUID[index] != 0) {
            type = UUID_TYPE_LONG;

            /* zero out the 16-bit part in the base; this will help equate long
             * UUIDs when they differ only in this 16-bit relative part.*/
            baseUUID[2] = 0;
            baseUUID[3] = 0;

            return;
        }
    }
}