Diff: microbit/microbit-dal/BLE_API/ble/UUID.h

Revision:

0:b9164b348919

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/microbit/microbit-dal/BLE_API/ble/UUID.h	Mon Oct 17 12:41:20 2016 +0000
@@ -0,0 +1,227 @@
+/* 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.
+ */
+
+#ifndef __UUID_H__
+#define __UUID_H__
+
+#include <stdint.h>
+#include <string.h>
+#include <algorithm>
+
+#include "blecommon.h"
+
+/**
+ * A trivial converter for single hexadecimal character to unsigned-int.
+ * @param  c hexadecimal character.
+ * @return   the corresponding value as unsigned int.
+ */
+static uint8_t char2int(char c) {
+    if ((c >= '0') && (c <= '9')) {
+        return c - '0';
+    } else if ((c >= 'a') && (c <= 'f')) {
+        return c - 'a' + 10;
+    } else if ((c >= 'A') && (c <= 'F')) {
+        return c - 'A' + 10;
+    } else {
+        return 0;
+    }
+}
+
+class UUID {
+public:
+    enum UUID_Type_t {
+        UUID_TYPE_SHORT = 0,    // Short BLE UUID.
+        UUID_TYPE_LONG  = 1     // Full 128-bit UUID.
+    };
+
+    /**
+     * An enumeration to specify byte ordering of the long version of the UUID.
+     */
+    typedef enum {
+        MSB, /*!< Most-significant byte first (at the smallest address) */
+        LSB  /*!< least-significant byte first (at the smallest address) */
+    } ByteOrder_t;
+
+    typedef uint16_t      ShortUUIDBytes_t;
+
+    static const unsigned LENGTH_OF_LONG_UUID = 16;
+    typedef uint8_t       LongUUIDBytes_t[LENGTH_OF_LONG_UUID];
+
+    static const unsigned MAX_UUID_STRING_LENGTH = LENGTH_OF_LONG_UUID * 2 + 4;
+
+public:
+
+    /**
+     * 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.
+     *
+     * @param  stringUUID
+     *          The 128-bit (16-byte) UUID as a human readable const-string.
+     *          Format: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
+     *          Upper and lower case supported. Hyphens are optional, but only
+     *          upto four of them. The UUID is stored internally as a 16 byte
+     *          array, LSB (little endian), which is opposite from the string.
+     */
+    UUID(const char* stringUUID) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
+        bool nibble = false;
+        uint8_t byte = 0;
+        size_t baseIndex = 0;
+        uint8_t tempUUID[LENGTH_OF_LONG_UUID];
+
+        // Iterate through string, abort if NULL is encountered prematurely.
+        // Ignore upto four hyphens.
+        for (size_t index = 0; (index < MAX_UUID_STRING_LENGTH) && (baseIndex < LENGTH_OF_LONG_UUID); index++) {
+            if (stringUUID[index] == '\0') {
+                // error abort
+                break;
+            } else if (stringUUID[index] == '-') {
+                // ignore hyphen
+                continue;
+            } else if (nibble) {
+                // got second nibble
+                byte |= char2int(stringUUID[index]);
+                nibble = false;
+
+                // store copy
+                tempUUID[baseIndex++] = byte;
+            } else {
+                // got first nibble
+                byte = char2int(stringUUID[index]) << 4;
+                nibble = true;
+            }
+        }
+
+        // populate internal variables if string was successfully parsed
+        if (baseIndex == LENGTH_OF_LONG_UUID) {
+            setupLong(tempUUID, UUID::MSB);
+        } else {
+            const uint8_t sig[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
+                                    0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB };
+            setupLong(sig, UUID::MSB);
+        }
+    }
+
+    /**
+     * 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.
+     *
+     * @param longUUID
+     *          The 128-bit (16-byte) UUID value.
+     * @param order
+     *          The bit order of the UUID, MSB by default.
+     */
+    UUID(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
+        setupLong(longUUID, order);
+    }
+
+    /**
+     * Creates a new 16-bit UUID.
+     *
+     * @note The UUID is a unique 16-bit (2 byte) ID used to identify
+     *       different service or characteristics on the BLE device.
+     *
+     * For efficiency, and because 16 bytes would take a large chunk of the
+     * 27-byte data payload length of the Link Layer, the BLE specification adds
+     * two additional UUID formats: 16-bit and 32-bit UUIDs. These shortened
+     * formats can be used only with UUIDs that are defined in the Bluetooth
+     * specification (listed by the Bluetooth SIG as standard
+     * Bluetooth UUIDs).
+     *
+     * To reconstruct the full 128-bit UUID from the shortened version, insert
+     * the 16-bit short value (indicated by xxxx, including leading zeros) into
+     * the Bluetooth Base UUID:
+     *
+     *  0000xxxx-0000-1000-8000-00805F9B34FB
+     *
+     * @note Shortening is not available for UUIDs that are not derived from the
+     *       Bluetooth Base UUID. Such non-standard UUIDs are commonly called
+     *       vendor-specific UUIDs. In these cases, you'll need to use the full
+     *       128-bit UUID value at all times.
+     *
+     * @note We don't yet support 32-bit shortened UUIDs.
+     */
+    UUID(ShortUUIDBytes_t _shortUUID) : type(UUID_TYPE_SHORT), baseUUID(), shortUUID(_shortUUID) {
+        /* Empty */
+    }
+
+    UUID(const UUID &source) {
+        type      = source.type;
+        shortUUID = source.shortUUID;
+        memcpy(baseUUID, source.baseUUID, LENGTH_OF_LONG_UUID);
+    }
+
+    UUID(void) : type(UUID_TYPE_SHORT), shortUUID(BLE_UUID_UNKNOWN) {
+        /* empty */
+    }
+
+    /**
+     * Fill in a 128-bit UUID; this is useful when the UUID isn't known at the time of the object construction.
+     */
+    void setupLong(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) {
+        type      = UUID_TYPE_LONG;
+        if (order == UUID::MSB) {
+            // Switch endian. Input is big-endian, internal representation is little endian.
+            std::reverse_copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
+        } else {
+            std::copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
+        }
+        shortUUID = (uint16_t)((baseUUID[13] << 8) | (baseUUID[12]));
+    }
+
+public:
+    UUID_Type_t       shortOrLong(void)  const {return type;     }
+    const uint8_t    *getBaseUUID(void)  const {
+        if (type == UUID_TYPE_SHORT) {
+            return (const uint8_t*)&shortUUID;
+        } else {
+            return baseUUID;
+        }
+    }
+
+    ShortUUIDBytes_t  getShortUUID(void) const {return shortUUID;}
+    uint8_t           getLen(void)       const {
+        return ((type == UUID_TYPE_SHORT) ? sizeof(ShortUUIDBytes_t) : LENGTH_OF_LONG_UUID);
+    }
+
+    bool operator== (const UUID &other) const {
+        if ((this->type == UUID_TYPE_SHORT) && (other.type == UUID_TYPE_SHORT) &&
+            (this->shortUUID == other.shortUUID)) {
+            return true;
+        }
+
+        if ((this->type == UUID_TYPE_LONG) && (other.type == UUID_TYPE_LONG) &&
+            (memcmp(this->baseUUID, other.baseUUID, LENGTH_OF_LONG_UUID) == 0)) {
+            return true;
+        }
+
+        return false;
+    }
+
+    bool operator!= (const UUID &other) const {
+        return !(*this == other);
+    }
+
+private:
+    UUID_Type_t      type;      // UUID_TYPE_SHORT or UUID_TYPE_LONG
+    LongUUIDBytes_t  baseUUID;  // The long UUID
+    ShortUUIDBytes_t shortUUID; // 16 bit UUID
+};
+
+#endif // ifndef __UUID_H__
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