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Merge "Add helper method to convert Bluetooth UUID to bytes"

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This commit is contained in:
Jakub Pawlowski
2016-10-25 21:36:38 +00:00
committed by Gerrit Code Review
parent 836ffa6e1c f67ee83a22
commit 8a0a58b218
1 changed files with 42 additions and 0 deletions
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42
core/java/android/bluetooth/BluetoothUuid.java
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@@ -274,6 +274,48 @@ public final class BluetoothUuid {
return new ParcelUuid(new UUID(msb, lsb));
}
/**
* Parse UUID to bytes. The returned value is shortest representation, a 16-bit, 32-bit or 128-bit UUID,
* Note returned value is little endian (Bluetooth).
*
* @param uuid uuid to parse.
* @return shortest representation of {@code uuid} as bytes.
* @throws IllegalArgumentException If the {@code uuid} is null.
*/
public static byte[] uuidToBytes(ParcelUuid uuid) {
if (uuid == null) {
throw new IllegalArgumentException("uuid cannot be null");
}
if (is16BitUuid(uuid)) {
byte[] uuidBytes = new byte[UUID_BYTES_16_BIT];
int uuidVal = getServiceIdentifierFromParcelUuid(uuid);
uuidBytes[0] = (byte)(uuidVal & 0xFF);
uuidBytes[1] = (byte)((uuidVal & 0xFF00) >> 8);
return uuidBytes;
}
if (is32BitUuid(uuid)) {
byte[] uuidBytes = new byte[UUID_BYTES_32_BIT];
int uuidVal = getServiceIdentifierFromParcelUuid(uuid);
uuidBytes[0] = (byte)(uuidVal & 0xFF);
uuidBytes[1] = (byte)((uuidVal & 0xFF00) >> 8);
uuidBytes[2] = (byte)((uuidVal & 0xFF0000) >> 16);
uuidBytes[3] = (byte)((uuidVal & 0xFF000000) >> 24);
return uuidBytes;
}
// Construct a 128 bit UUID.
long msb = uuid.getUuid().getMostSignificantBits();
long lsb = uuid.getUuid().getLeastSignificantBits();
byte[] uuidBytes = new byte[UUID_BYTES_128_BIT];
ByteBuffer buf = ByteBuffer.wrap(uuidBytes).order(ByteOrder.LITTLE_ENDIAN);
buf.putLong(8, msb);
buf.putLong(0, lsb);
return uuidBytes;
}
/**
* Check whether the given parcelUuid can be converted to 16 bit bluetooth uuid.
*