Android Open Source - Bluetooth-Manager-for-Glass Gatt Utils

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License

The source code is released under:

MIT License

Java Source Code

package com.movisens.smartgattlib;
/*from  ww w  . j  ava 2s .  c o  m*/
import java.util.UUID;

public class GattUtils {
    public static final long leastSigBits = 0x800000805f9b34fbL;

    public static final int FIRST_BITMASK = 0x01;
    public static final int SECOND_BITMASK = FIRST_BITMASK << 1;
    public static final int THIRD_BITMASK = FIRST_BITMASK << 2;
    public static final int FOURTH_BITMASK = FIRST_BITMASK << 3;
    public static final int FIFTH_BITMASK = FIRST_BITMASK << 4;
    public static final int SIXTH_BITMASK = FIRST_BITMASK << 5;
    public static final int SEVENTH_BITMASK = FIRST_BITMASK << 6;
    public static final int EIGTH_BITMASK = FIRST_BITMASK << 7;

    public static final int FORMAT_UINT8 = 17;
    public static final int FORMAT_UINT16 = 18;
    public static final int FORMAT_UINT32 = 20;
    public static final int FORMAT_SINT8 = 33;
    public static final int FORMAT_SINT16 = 34;
    public static final int FORMAT_SINT32 = 36;
    public static final int FORMAT_SFLOAT = 50;
    public static final int FORMAT_FLOAT = 52;

    public static UUID toUuid(String uuidString) {
        return UUID.fromString(uuidString);
    }

    public static UUID toUuid(long assignedNumber) {
        return new UUID((assignedNumber << 32) | 0x1000, leastSigBits);
    }

    public static String toUuid128(long assignedNumber) {
        return toUuid(assignedNumber).toString();
    }

    public static String toUuid16(int assignedNumber) {
        return Integer.toHexString(assignedNumber);
    }

    public static Integer getIntValue(byte[] value, int format, int position) {
        if (value == null)
            return null;
        if (position + (format & 0xF) > value.length)
            return null;
        switch (format) {
            case FORMAT_UINT8:
                return Integer.valueOf(value[position] & 0xFF);
            case FORMAT_UINT16:
                return Integer.valueOf(add(value[position], value[(position + 1)]));
            case FORMAT_UINT32:
                return Integer.valueOf(add(value[position], value[(position + 1)],
                        value[(position + 2)], value[(position + 3)]));
            case FORMAT_SINT8:
                return Integer.valueOf(signed(value[position] & 0xFF, 8));
            case FORMAT_SINT16:
                return Integer.valueOf(signed(
                        add(value[position], value[(position + 1)]), 16));
            case FORMAT_SINT32:
                return Integer.valueOf(signed(
                        add(value[position], value[(position + 1)],
                                value[(position + 2)], value[(position + 3)]), 32
                ));
        }
        return null;
    }

    public static Float getFloatValue(byte[] value, int format, int position) {
        if (value == null)
            return null;
        if (position + (format & 0xF) > value.length)
            return null;
        int i;
        int mantissa;
        int exponent;
        switch (format) {
            case FORMAT_SFLOAT:
                i = value[(position + 1)];
                position = value[position];
                mantissa = signed((position & 0xFF) + ((i & 0xFF & 0xF) << 8), 12);
                exponent = signed((i & 0xFF) >> 4, 4);
                return Float
                        .valueOf((float) (mantissa * Math.pow(10.0D, exponent)));
            case FORMAT_FLOAT:
                exponent = value[(position + 3)];
                mantissa = value[(position + 2)];
                i = value[(position + 1)];
                position = value[position];
                return Float
                        .valueOf((float) ((format = signed((position & 0xFF)
                                + ((i & 0xFF) << 8) + ((mantissa & 0xFF) << 16), 24)) * Math
                                .pow(10.0D, exponent)));
        }
        return null;
    }

    public static String getStringValue(byte[] value, int position) {
        if (value == null)
            return null;
        if (position > value.length)
            return null;
        byte[] arrayOfByte = new byte[value.length - position];
        for (int i = 0; i != value.length - position; i++) {
            arrayOfByte[i] = value[(position + i)];
        }
        return new String(arrayOfByte);
    }

    private static int add(byte byte1, byte byte2) {
        return (byte1 & 0xFF) + ((byte2 & 0xFF) << 8);
    }

    private static int add(byte byte1, byte byte2, byte byte3, byte byte4) {
        return (byte1 & 0xFF) + ((byte2 & 0xFF) << 8) + ((byte3 & 0xFF) << 16)
                + ((byte4 & 0xFF) << 24);
    }

    private static int signed(int value, int length) {
        if ((value & 1 << length - 1) != 0)
            value = -1 * ((1 << length - 1) - (value & (1 << length - 1) - 1));
        return value;
    }

    /**
     * Convert hex byte array from motorola API to byte array.
     *
     * @param hexByteArray
     * @return
     */
    public static byte[] hexByteArrayToByteArray(byte[] hexByteArray) {
        return hexStringToByteArray(new String(hexByteArray));
    }

    /**
     * Convert string from motorola API to a byte array.
     *
     * @param hexString
     * @return
     */
    public static byte[] hexStringToByteArray(String hexString) {
        int len = hexString.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character
                    .digit(hexString.charAt(i + 1), 16));
        }
        return data;
    }
}

Java Source Code List

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