BleDataDecoder

Decodes a BleData into a value of type T without copying.

On iOS, BleData wraps NSData from CoreBluetooth with zero-copy. A BleDataDecoder reads directly from the platform-native buffer via indexed access (BleData.get), avoiding the allocation and memcpy that BleData.toByteArray would incur.

val decoder = BleDataDecoder<HeartRate> { data ->
    val flags = data[0].toInt()
    val bpm = if (flags and 0x01 == 0) data[1].toInt() and 0xFF
              else (data[1].toInt() and 0xFF) or ((data[2].toInt() and 0xFF) shl 8)
    HeartRate(bpm)
}