/* uuid.c - Bluetooth UUID handling */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2) Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3) Neither the name of Intel Corporation nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <nanokernel.h>
#include <toolchain.h>
#include <string.h>
#include <errno.h>

#include <bluetooth/uuid.h>

/* TODO: Decide wether to continue using BLE format or switch to RFC 4122 */
static const struct bt_uuid uuid128_base = {
	.type = BT_UUID_128,
	.u128 = { 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10,
		  0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },

};

static void uuid_to_uuid128(const struct bt_uuid *src, struct bt_uuid *dst)
{
	switch (src->type) {
	case BT_UUID_16:
		*dst = uuid128_base;
		memcpy(&dst->u128[2], &src->u16, sizeof(src->u16));
		return;
	case BT_UUID_128:
		memcpy(dst, src, sizeof(*dst));
		return;
	}
}

static int uuid128_cmp(const struct bt_uuid *u1, const struct bt_uuid *u2)
{
	struct bt_uuid uuid1, uuid2;

	uuid_to_uuid128(u1, &uuid1);
	uuid_to_uuid128(u2, &uuid2);

	return memcmp(uuid1.u128, uuid2.u128, sizeof(uuid1.u128));
}

int bt_uuid_cmp(const struct bt_uuid *u1, const struct bt_uuid *u2)
{
	/* Convert to 128 bit if types don't match */
	if (u1->type != u2->type)
		return uuid128_cmp(u1, u2);

	switch (u1->type) {
	case BT_UUID_16:
		return (int)u1->u16 - (int)u2->u16;
	case BT_UUID_128:
		return memcmp(u1->u128, u2->u128, sizeof(u1->u128));
	}

	return -EINVAL;
}