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Fork of BLE_API by Bluetooth Low Energy

ble/UUID.h@1039:2ea9d52111e2, 2015-12-10 (annotated)

Committer:
rgrover1
Date:
Thu Dec 10 09:15:04 2015 +0000
Revision:
1039:2ea9d52111e2
Parent:
1038:ebf9746bff7d
Child:
1042:21a86ac7f5b1
Synchronized with git rev 694130ff

Author: Rohit Grover

use std::reverse_copy to switch byte-order

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 710:b2e1a2660ec2 1 /* mbed Microcontroller Library
rgrover1 710:b2e1a2660ec2 2 * Copyright (c) 2006-2013 ARM Limited
rgrover1 710:b2e1a2660ec2 3 *
rgrover1 710:b2e1a2660ec2 4 * Licensed under the Apache License, Version 2.0 (the "License");
rgrover1 710:b2e1a2660ec2 5 * you may not use this file except in compliance with the License.
rgrover1 710:b2e1a2660ec2 6 * You may obtain a copy of the License at
rgrover1 710:b2e1a2660ec2 7 *
rgrover1 710:b2e1a2660ec2 8 * http://www.apache.org/licenses/LICENSE-2.0
rgrover1 710:b2e1a2660ec2 9 *
rgrover1 710:b2e1a2660ec2 10 * Unless required by applicable law or agreed to in writing, software
rgrover1 710:b2e1a2660ec2 11 * distributed under the License is distributed on an "AS IS" BASIS,
rgrover1 710:b2e1a2660ec2 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rgrover1 710:b2e1a2660ec2 13 * See the License for the specific language governing permissions and
rgrover1 710:b2e1a2660ec2 14 * limitations under the License.
rgrover1 710:b2e1a2660ec2 15 */
rgrover1 710:b2e1a2660ec2 16
rgrover1 710:b2e1a2660ec2 17 #ifndef __UUID_H__
rgrover1 710:b2e1a2660ec2 18 #define __UUID_H__
rgrover1 710:b2e1a2660ec2 19
rgrover1 710:b2e1a2660ec2 20 #include <stdint.h>
rgrover1 710:b2e1a2660ec2 21 #include <string.h>
rgrover1 1039:2ea9d52111e2 22 #include <algorithm>
rgrover1 710:b2e1a2660ec2 23
rgrover1 710:b2e1a2660ec2 24 #include "blecommon.h"
rgrover1 710:b2e1a2660ec2 25
rgrover1 1037:ec64da75c9ee 26 /**
rgrover1 1037:ec64da75c9ee 27 * A trivial converter for single hexadecimal character to unsigned-int.
rgrover1 1037:ec64da75c9ee 28 * @param c hexadecimal character.
rgrover1 1037:ec64da75c9ee 29 * @return the corresponding value as unsigned int.
rgrover1 1037:ec64da75c9ee 30 */
rgrover1 1035:d8ba3cb5a39a 31 static uint8_t char2int(char c) {
rgrover1 1035:d8ba3cb5a39a 32 if ((c >= '0') && (c <= '9')) {
rgrover1 1035:d8ba3cb5a39a 33 return c - '0';
rgrover1 1035:d8ba3cb5a39a 34 } else if ((c >= 'a') && (c <= 'f')) {
rgrover1 1035:d8ba3cb5a39a 35 return c - 'a' + 10;
rgrover1 1035:d8ba3cb5a39a 36 } else if ((c >= 'A') && (c <= 'F')) {
rgrover1 1035:d8ba3cb5a39a 37 return c - 'A' + 10;
rgrover1 1035:d8ba3cb5a39a 38 } else {
rgrover1 1035:d8ba3cb5a39a 39 return 0;
rgrover1 1035:d8ba3cb5a39a 40 }
rgrover1 1035:d8ba3cb5a39a 41 }
rgrover1 1035:d8ba3cb5a39a 42
rgrover1 710:b2e1a2660ec2 43 class UUID {
rgrover1 710:b2e1a2660ec2 44 public:
rgrover1 710:b2e1a2660ec2 45 enum UUID_Type_t {
rgrover1 993:4d62b7967c11 46 UUID_TYPE_SHORT = 0, // Short BLE UUID.
rgrover1 993:4d62b7967c11 47 UUID_TYPE_LONG = 1 // Full 128-bit UUID.
rgrover1 710:b2e1a2660ec2 48 };
rgrover1 710:b2e1a2660ec2 49
rgrover1 1038:ebf9746bff7d 50 /**
rgrover1 1038:ebf9746bff7d 51 * An enumeration to specify byte ordering of the long version of the UUID.
rgrover1 1038:ebf9746bff7d 52 */
rgrover1 1035:d8ba3cb5a39a 53 typedef enum {
rgrover1 1038:ebf9746bff7d 54 MSB, /*!< Most-significant byte first (at the smallest address) */
rgrover1 1038:ebf9746bff7d 55 LSB /*!< least-significant byte first (at the smallest address) */
rgrover1 1038:ebf9746bff7d 56 } ByteOrder_t;
rgrover1 1035:d8ba3cb5a39a 57
rgrover1 710:b2e1a2660ec2 58 typedef uint16_t ShortUUIDBytes_t;
rgrover1 710:b2e1a2660ec2 59
rgrover1 710:b2e1a2660ec2 60 static const unsigned LENGTH_OF_LONG_UUID = 16;
rgrover1 710:b2e1a2660ec2 61 typedef uint8_t LongUUIDBytes_t[LENGTH_OF_LONG_UUID];
rgrover1 710:b2e1a2660ec2 62
rgrover1 1035:d8ba3cb5a39a 63 static const unsigned MAX_UUID_STRING_LENGTH = LENGTH_OF_LONG_UUID * 2 + 4;
rgrover1 1035:d8ba3cb5a39a 64
rgrover1 710:b2e1a2660ec2 65 public:
rgrover1 1035:d8ba3cb5a39a 66
rgrover1 1035:d8ba3cb5a39a 67 /**
rgrover1 1035:d8ba3cb5a39a 68 * Creates a new 128-bit UUID.
rgrover1 1035:d8ba3cb5a39a 69 *
rgrover1 1035:d8ba3cb5a39a 70 * @note The UUID is a unique 128-bit (16 byte) ID used to identify
rgrover1 1035:d8ba3cb5a39a 71 * different service or characteristics on the BLE device.
rgrover1 1035:d8ba3cb5a39a 72 *
rgrover1 1035:d8ba3cb5a39a 73 * @param stringUUID
rgrover1 1035:d8ba3cb5a39a 74 * The 128-bit (16-byte) UUID as a human readable const-string.
rgrover1 1035:d8ba3cb5a39a 75 * Format: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
rgrover1 1035:d8ba3cb5a39a 76 * Upper and lower case supported. Hyphens are optional, but only
rgrover1 1035:d8ba3cb5a39a 77 * upto four of them. The UUID is stored internally as a 16 byte
rgrover1 1035:d8ba3cb5a39a 78 * array, LSB (little endian), which is opposite from the string.
rgrover1 1035:d8ba3cb5a39a 79 */
rgrover1 1035:d8ba3cb5a39a 80 UUID(const char* stringUUID) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
rgrover1 1035:d8ba3cb5a39a 81 bool nibble = false;
rgrover1 1035:d8ba3cb5a39a 82 uint8_t byte = 0;
rgrover1 1035:d8ba3cb5a39a 83 size_t baseIndex = 0;
rgrover1 1035:d8ba3cb5a39a 84 uint8_t tempUUID[LENGTH_OF_LONG_UUID];
rgrover1 1035:d8ba3cb5a39a 85
rgrover1 1035:d8ba3cb5a39a 86 // Iterate through string, abort if NULL is encountered prematurely.
rgrover1 1035:d8ba3cb5a39a 87 // Ignore upto four hyphens.
rgrover1 1035:d8ba3cb5a39a 88 for (size_t index = 0; (index < MAX_UUID_STRING_LENGTH) && (baseIndex < LENGTH_OF_LONG_UUID); index++) {
rgrover1 1035:d8ba3cb5a39a 89 if (stringUUID[index] == '\0') {
rgrover1 1035:d8ba3cb5a39a 90 // error abort
rgrover1 1035:d8ba3cb5a39a 91 break;
rgrover1 1035:d8ba3cb5a39a 92 } else if (stringUUID[index] == '-') {
rgrover1 1035:d8ba3cb5a39a 93 // ignore hyphen
rgrover1 1035:d8ba3cb5a39a 94 continue;
rgrover1 1035:d8ba3cb5a39a 95 } else if (nibble) {
rgrover1 1035:d8ba3cb5a39a 96 // got second nibble
rgrover1 1035:d8ba3cb5a39a 97 byte |= char2int(stringUUID[index]);
rgrover1 1035:d8ba3cb5a39a 98 nibble = false;
rgrover1 1035:d8ba3cb5a39a 99
rgrover1 1035:d8ba3cb5a39a 100 // store copy
rgrover1 1035:d8ba3cb5a39a 101 tempUUID[baseIndex++] = byte;
rgrover1 1035:d8ba3cb5a39a 102 } else {
rgrover1 1035:d8ba3cb5a39a 103 // got first nibble
rgrover1 1035:d8ba3cb5a39a 104 byte = char2int(stringUUID[index]) << 4;
rgrover1 1035:d8ba3cb5a39a 105 nibble = true;
rgrover1 1035:d8ba3cb5a39a 106 }
rgrover1 1035:d8ba3cb5a39a 107 }
rgrover1 1035:d8ba3cb5a39a 108
rgrover1 1035:d8ba3cb5a39a 109 // populate internal variables if string was successfully parsed
rgrover1 1035:d8ba3cb5a39a 110 if (baseIndex == LENGTH_OF_LONG_UUID) {
rgrover1 1035:d8ba3cb5a39a 111 setupLong(tempUUID, UUID::MSB);
rgrover1 1035:d8ba3cb5a39a 112 } else {
rgrover1 1035:d8ba3cb5a39a 113 const uint8_t sig[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
rgrover1 1035:d8ba3cb5a39a 114 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB };
rgrover1 1035:d8ba3cb5a39a 115 setupLong(sig, UUID::MSB);
rgrover1 1035:d8ba3cb5a39a 116 }
rgrover1 1035:d8ba3cb5a39a 117 }
rgrover1 1035:d8ba3cb5a39a 118
rgrover1 710:b2e1a2660ec2 119 /**
rgrover1 993:4d62b7967c11 120 * Creates a new 128-bit UUID.
rgrover1 710:b2e1a2660ec2 121 *
rgrover1 710:b2e1a2660ec2 122 * @note The UUID is a unique 128-bit (16 byte) ID used to identify
rgrover1 710:b2e1a2660ec2 123 * different service or characteristics on the BLE device.
rgrover1 710:b2e1a2660ec2 124 *
rgrover1 710:b2e1a2660ec2 125 * @param longUUID
rgrover1 1035:d8ba3cb5a39a 126 * The 128-bit (16-byte) UUID value.
rgrover1 1035:d8ba3cb5a39a 127 * @param order
rgrover1 1035:d8ba3cb5a39a 128 * The bit order of the UUID, MSB by default.
rgrover1 710:b2e1a2660ec2 129 */
rgrover1 1038:ebf9746bff7d 130 UUID(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
rgrover1 1035:d8ba3cb5a39a 131 setupLong(longUUID, order);
rgrover1 710:b2e1a2660ec2 132 }
rgrover1 710:b2e1a2660ec2 133
rgrover1 710:b2e1a2660ec2 134 /**
rgrover1 993:4d62b7967c11 135 * Creates a new 16-bit UUID.
rgrover1 710:b2e1a2660ec2 136 *
rgrover1 710:b2e1a2660ec2 137 * @note The UUID is a unique 16-bit (2 byte) ID used to identify
rgrover1 710:b2e1a2660ec2 138 * different service or characteristics on the BLE device.
rgrover1 710:b2e1a2660ec2 139 *
rgrover1 710:b2e1a2660ec2 140 * For efficiency, and because 16 bytes would take a large chunk of the
rgrover1 710:b2e1a2660ec2 141 * 27-byte data payload length of the Link Layer, the BLE specification adds
rgrover1 710:b2e1a2660ec2 142 * two additional UUID formats: 16-bit and 32-bit UUIDs. These shortened
rgrover1 710:b2e1a2660ec2 143 * formats can be used only with UUIDs that are defined in the Bluetooth
rgrover1 993:4d62b7967c11 144 * specification (listed by the Bluetooth SIG as standard
rgrover1 710:b2e1a2660ec2 145 * Bluetooth UUIDs).
rgrover1 710:b2e1a2660ec2 146 *
rgrover1 710:b2e1a2660ec2 147 * To reconstruct the full 128-bit UUID from the shortened version, insert
rgrover1 710:b2e1a2660ec2 148 * the 16-bit short value (indicated by xxxx, including leading zeros) into
rgrover1 710:b2e1a2660ec2 149 * the Bluetooth Base UUID:
rgrover1 710:b2e1a2660ec2 150 *
rgrover1 710:b2e1a2660ec2 151 * 0000xxxx-0000-1000-8000-00805F9B34FB
rgrover1 710:b2e1a2660ec2 152 *
rgrover1 710:b2e1a2660ec2 153 * @note Shortening is not available for UUIDs that are not derived from the
rgrover1 710:b2e1a2660ec2 154 * Bluetooth Base UUID. Such non-standard UUIDs are commonly called
rgrover1 710:b2e1a2660ec2 155 * vendor-specific UUIDs. In these cases, you’ll need to use the full
rgrover1 710:b2e1a2660ec2 156 * 128-bit UUID value at all times.
rgrover1 710:b2e1a2660ec2 157 *
rgrover1 993:4d62b7967c11 158 * @note We don't yet support 32-bit shortened UUIDs.
rgrover1 710:b2e1a2660ec2 159 */
rgrover1 911:885ee648c6ab 160 UUID(ShortUUIDBytes_t _shortUUID) : type(UUID_TYPE_SHORT), baseUUID(), shortUUID(_shortUUID) {
rgrover1 993:4d62b7967c11 161 /* Empty */
rgrover1 710:b2e1a2660ec2 162 }
rgrover1 710:b2e1a2660ec2 163
rgrover1 710:b2e1a2660ec2 164 UUID(const UUID &source) {
rgrover1 710:b2e1a2660ec2 165 type = source.type;
rgrover1 710:b2e1a2660ec2 166 shortUUID = source.shortUUID;
rgrover1 710:b2e1a2660ec2 167 memcpy(baseUUID, source.baseUUID, LENGTH_OF_LONG_UUID);
rgrover1 710:b2e1a2660ec2 168 }
rgrover1 710:b2e1a2660ec2 169
rgrover1 710:b2e1a2660ec2 170 UUID(void) : type(UUID_TYPE_SHORT), shortUUID(BLE_UUID_UNKNOWN) {
rgrover1 710:b2e1a2660ec2 171 /* empty */
rgrover1 710:b2e1a2660ec2 172 }
rgrover1 710:b2e1a2660ec2 173
rgrover1 710:b2e1a2660ec2 174 /**
rgrover1 993:4d62b7967c11 175 * Fill in a 128-bit UUID; this is useful when the UUID isn't known at the time of the object construction.
rgrover1 710:b2e1a2660ec2 176 */
rgrover1 1038:ebf9746bff7d 177 void setupLong(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) {
rgrover1 710:b2e1a2660ec2 178 type = UUID_TYPE_LONG;
rgrover1 1035:d8ba3cb5a39a 179 if (order == UUID::MSB) {
rgrover1 1035:d8ba3cb5a39a 180 // Switch endian. Input is big-endian, internal representation is little endian.
rgrover1 1039:2ea9d52111e2 181 std::reverse_copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
rgrover1 1035:d8ba3cb5a39a 182 } else {
rgrover1 1039:2ea9d52111e2 183 std::copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
rgrover1 1035:d8ba3cb5a39a 184 }
rgrover1 1035:d8ba3cb5a39a 185 shortUUID = (uint16_t)((baseUUID[13] << 8) | (baseUUID[12]));
rgrover1 710:b2e1a2660ec2 186 }
rgrover1 710:b2e1a2660ec2 187
rgrover1 710:b2e1a2660ec2 188 public:
rgrover1 710:b2e1a2660ec2 189 UUID_Type_t shortOrLong(void) const {return type; }
rgrover1 710:b2e1a2660ec2 190 const uint8_t *getBaseUUID(void) const {
rgrover1 710:b2e1a2660ec2 191 if (type == UUID_TYPE_SHORT) {
rgrover1 710:b2e1a2660ec2 192 return (const uint8_t*)&shortUUID;
rgrover1 710:b2e1a2660ec2 193 } else {
rgrover1 710:b2e1a2660ec2 194 return baseUUID;
rgrover1 710:b2e1a2660ec2 195 }
rgrover1 710:b2e1a2660ec2 196 }
rgrover1 710:b2e1a2660ec2 197
rgrover1 710:b2e1a2660ec2 198 ShortUUIDBytes_t getShortUUID(void) const {return shortUUID;}
rgrover1 710:b2e1a2660ec2 199 uint8_t getLen(void) const {
rgrover1 710:b2e1a2660ec2 200 return ((type == UUID_TYPE_SHORT) ? sizeof(ShortUUIDBytes_t) : LENGTH_OF_LONG_UUID);
rgrover1 710:b2e1a2660ec2 201 }
rgrover1 710:b2e1a2660ec2 202
rgrover1 710:b2e1a2660ec2 203 bool operator== (const UUID &other) const {
rgrover1 710:b2e1a2660ec2 204 if ((this->type == UUID_TYPE_SHORT) && (other.type == UUID_TYPE_SHORT) &&
rgrover1 710:b2e1a2660ec2 205 (this->shortUUID == other.shortUUID)) {
rgrover1 710:b2e1a2660ec2 206 return true;
rgrover1 710:b2e1a2660ec2 207 }
rgrover1 710:b2e1a2660ec2 208
rgrover1 710:b2e1a2660ec2 209 if ((this->type == UUID_TYPE_LONG) && (other.type == UUID_TYPE_LONG) &&
rgrover1 710:b2e1a2660ec2 210 (memcmp(this->baseUUID, other.baseUUID, LENGTH_OF_LONG_UUID) == 0)) {
rgrover1 710:b2e1a2660ec2 211 return true;
rgrover1 710:b2e1a2660ec2 212 }
rgrover1 710:b2e1a2660ec2 213
rgrover1 710:b2e1a2660ec2 214 return false;
rgrover1 710:b2e1a2660ec2 215 }
rgrover1 710:b2e1a2660ec2 216
rgrover1 710:b2e1a2660ec2 217 bool operator!= (const UUID &other) const {
rgrover1 710:b2e1a2660ec2 218 return !(*this == other);
rgrover1 710:b2e1a2660ec2 219 }
rgrover1 710:b2e1a2660ec2 220
rgrover1 710:b2e1a2660ec2 221 private:
rgrover1 710:b2e1a2660ec2 222 UUID_Type_t type; // UUID_TYPE_SHORT or UUID_TYPE_LONG
rgrover1 1035:d8ba3cb5a39a 223 LongUUIDBytes_t baseUUID; // The long UUID
rgrover1 1035:d8ba3cb5a39a 224 ShortUUIDBytes_t shortUUID; // 16 bit UUID
rgrover1 710:b2e1a2660ec2 225 };
rgrover1 710:b2e1a2660ec2 226
rgrover1 710:b2e1a2660ec2 227 #endif // ifndef __UUID_H__