131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* uuid.c - Bluetooth UUID handling */
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/*
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* Copyright (c) 2015-2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <errno.h>
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#include <sys/byteorder.h>
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#include <sys/printk.h>
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#include <bluetooth/uuid.h>
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#define UUID_16_BASE_OFFSET 12
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/* TODO: Decide whether to continue using BLE format or switch to RFC 4122 */
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/* Base UUID : 0000[0000]-0000-1000-8000-00805F9B34FB
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* 0x2800 : 0000[2800]-0000-1000-8000-00805F9B34FB
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* little endian 0x2800 : [00 28] -> no swapping required
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* big endian 0x2800 : [28 00] -> swapping required
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*/
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static const struct bt_uuid_128 uuid128_base = {
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.uuid = { BT_UUID_TYPE_128 },
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.val = { BT_UUID_128_ENCODE(
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0x00000000, 0x0000, 0x1000, 0x8000, 0x00805F9B34FB) }
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};
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static void uuid_to_uuid128(const struct bt_uuid *src, struct bt_uuid_128 *dst)
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{
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switch (src->type) {
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case BT_UUID_TYPE_16:
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*dst = uuid128_base;
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sys_put_le16(BT_UUID_16(src)->val,
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&dst->val[UUID_16_BASE_OFFSET]);
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return;
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case BT_UUID_TYPE_32:
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*dst = uuid128_base;
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sys_put_le32(BT_UUID_32(src)->val,
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&dst->val[UUID_16_BASE_OFFSET]);
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return;
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case BT_UUID_TYPE_128:
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memcpy(dst, src, sizeof(*dst));
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return;
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}
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}
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static int uuid128_cmp(const struct bt_uuid *u1, const struct bt_uuid *u2)
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{
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struct bt_uuid_128 uuid1, uuid2;
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uuid_to_uuid128(u1, &uuid1);
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uuid_to_uuid128(u2, &uuid2);
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return memcmp(uuid1.val, uuid2.val, 16);
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}
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int bt_uuid_cmp(const struct bt_uuid *u1, const struct bt_uuid *u2)
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{
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/* Convert to 128 bit if types don't match */
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if (u1->type != u2->type) {
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return uuid128_cmp(u1, u2);
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}
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switch (u1->type) {
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case BT_UUID_TYPE_16:
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return (int)BT_UUID_16(u1)->val - (int)BT_UUID_16(u2)->val;
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case BT_UUID_TYPE_32:
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return (int)BT_UUID_32(u1)->val - (int)BT_UUID_32(u2)->val;
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case BT_UUID_TYPE_128:
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return memcmp(BT_UUID_128(u1)->val, BT_UUID_128(u2)->val, 16);
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}
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return -EINVAL;
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}
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bool bt_uuid_create(struct bt_uuid *uuid, const uint8_t *data, uint8_t data_len)
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{
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/* Copy UUID from packet data/internal variable to internal bt_uuid */
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switch (data_len) {
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case 2:
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uuid->type = BT_UUID_TYPE_16;
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BT_UUID_16(uuid)->val = sys_get_le16(data);
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break;
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case 4:
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uuid->type = BT_UUID_TYPE_32;
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BT_UUID_32(uuid)->val = sys_get_le32(data);
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break;
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case 16:
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uuid->type = BT_UUID_TYPE_128;
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memcpy(&BT_UUID_128(uuid)->val, data, 16);
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break;
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default:
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return false;
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}
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return true;
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}
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void bt_uuid_to_str(const struct bt_uuid *uuid, char *str, size_t len)
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{
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uint32_t tmp1, tmp5;
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uint16_t tmp0, tmp2, tmp3, tmp4;
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switch (uuid->type) {
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case BT_UUID_TYPE_16:
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snprintk(str, len, "%04x", BT_UUID_16(uuid)->val);
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break;
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case BT_UUID_TYPE_32:
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snprintk(str, len, "%08x", BT_UUID_32(uuid)->val);
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break;
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case BT_UUID_TYPE_128:
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memcpy(&tmp0, &BT_UUID_128(uuid)->val[0], sizeof(tmp0));
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memcpy(&tmp1, &BT_UUID_128(uuid)->val[2], sizeof(tmp1));
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memcpy(&tmp2, &BT_UUID_128(uuid)->val[6], sizeof(tmp2));
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memcpy(&tmp3, &BT_UUID_128(uuid)->val[8], sizeof(tmp3));
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memcpy(&tmp4, &BT_UUID_128(uuid)->val[10], sizeof(tmp4));
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memcpy(&tmp5, &BT_UUID_128(uuid)->val[12], sizeof(tmp5));
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snprintk(str, len, "%08x-%04x-%04x-%04x-%08x%04x",
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sys_le32_to_cpu(tmp5), sys_le16_to_cpu(tmp4),
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sys_le16_to_cpu(tmp3), sys_le16_to_cpu(tmp2),
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sys_le32_to_cpu(tmp1), sys_le16_to_cpu(tmp0));
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break;
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default:
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(void)memset(str, 0, len);
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return;
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}
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}
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