| /* uuid.c - Bluetooth UUID handling */ |
| |
| /* |
| * Copyright (c) 2015 Intel 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. |
| */ |
| |
| #include <nanokernel.h> |
| #include <toolchain.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <misc/byteorder.h> |
| |
| #include <bluetooth/uuid.h> |
| |
| #if defined(CONFIG_BLUETOOTH_DEBUG) |
| #include <stdio.h> |
| #endif /* CONFIG_BLUETOOTH_DEBUG */ |
| |
| #define UUID_16_BASE_OFFSET 12 |
| |
| /* TODO: Decide whether to continue using BLE format or switch to RFC 4122 */ |
| |
| /* Base UUID : 0000[0000]-0000-1000-8000-00805F9B34FB -> |
| * { 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, |
| * 0x00, 0x10, 0x00, 0x00, [0x00, 0x00], 0x00, 0x00 } |
| * 0x2800 : 0000[2800]-0000-1000-8000-00805F9B34FB -> |
| * { 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, |
| * 0x00, 0x10, 0x00, 0x00, [0x00, 0x28], 0x00, 0x00 } |
| * little endian 0x2800 : [00 28] -> no swapping required |
| * big endian 0x2800 : [28 00] -> swapping required |
| */ |
| static const struct bt_uuid_128 uuid128_base = { |
| .uuid.type = BT_UUID_TYPE_128, |
| .val = { 0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, |
| 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, |
| }; |
| |
| static inline void u16_to_uuid128(void *dst, uint16_t u16) |
| { |
| #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| u16 = bswap_16(u16); |
| #endif |
| memcpy(dst, &u16, 2); |
| } |
| |
| static void uuid_to_uuid128(const struct bt_uuid *src, struct bt_uuid_128 *dst) |
| { |
| switch (src->type) { |
| case BT_UUID_TYPE_16: |
| *dst = uuid128_base; |
| u16_to_uuid128(&dst->val[UUID_16_BASE_OFFSET], |
| BT_UUID_16(src)->val); |
| return; |
| case BT_UUID_TYPE_128: |
| memcpy(dst, src, sizeof(*dst)); |
| return; |
| } |
| } |
| |
| static int uuid128_cmp(const struct bt_uuid *u1, const struct bt_uuid *u2) |
| { |
| struct bt_uuid_128 uuid1, uuid2; |
| |
| uuid_to_uuid128(u1, &uuid1); |
| uuid_to_uuid128(u2, &uuid2); |
| |
| return memcmp(uuid1.val, uuid2.val, 16); |
| } |
| |
| 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_TYPE_16: |
| return (int)BT_UUID_16(u1)->val - (int)BT_UUID_16(u2)->val; |
| case BT_UUID_TYPE_128: |
| return memcmp(BT_UUID_128(u1)->val, BT_UUID_128(u2)->val, 16); |
| } |
| |
| return -EINVAL; |
| } |
| |
| #if defined(CONFIG_BLUETOOTH_DEBUG) |
| void bt_uuid_to_str(const struct bt_uuid *uuid, char *str, size_t len) |
| { |
| uint32_t tmp1, tmp5; |
| uint16_t tmp0, tmp2, tmp3, tmp4; |
| |
| switch (uuid->type) { |
| case BT_UUID_TYPE_16: |
| snprintf(str, len, "%.4x", BT_UUID_16(uuid)->val); |
| break; |
| case BT_UUID_TYPE_128: |
| memcpy(&tmp0, &BT_UUID_128(uuid)->val[0], sizeof(tmp0)); |
| memcpy(&tmp1, &BT_UUID_128(uuid)->val[2], sizeof(tmp1)); |
| memcpy(&tmp2, &BT_UUID_128(uuid)->val[6], sizeof(tmp2)); |
| memcpy(&tmp3, &BT_UUID_128(uuid)->val[8], sizeof(tmp3)); |
| memcpy(&tmp4, &BT_UUID_128(uuid)->val[10], sizeof(tmp4)); |
| memcpy(&tmp5, &BT_UUID_128(uuid)->val[12], sizeof(tmp5)); |
| |
| snprintf(str, len, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x", |
| tmp5, tmp4, tmp3, tmp2, tmp1, tmp0); |
| break; |
| default: |
| memset(str, 0, len); |
| return; |
| } |
| } |
| |
| const char *bt_uuid_str(const struct bt_uuid *uuid) |
| { |
| static char str[37]; |
| |
| bt_uuid_to_str(uuid, str, sizeof(str)); |
| |
| return str; |
| } |
| #endif /* CONFIG_BLUETOOTH_DEBUG */ |