com.btchip.comm.LedgerHelper Java Examples
The following examples show how to use
com.btchip.comm.LedgerHelper.
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Example #1
Source File: BTChipTransportAndroidHID.java From xmrwallet with Apache License 2.0 | 5 votes |
@Override public byte[] exchange(byte[] command) { ByteArrayOutputStream response = new ByteArrayOutputStream(); byte[] responseData = null; int offset = 0; if (debug) { Timber.d("=> %s", Dump.dump(command)); } command = LedgerHelper.wrapCommandAPDU(LEDGER_DEFAULT_CHANNEL, command, HID_BUFFER_SIZE); UsbRequest requestOut = new UsbRequest(); requestOut.initialize(connection, out); while (offset != command.length) { int blockSize = (command.length - offset > HID_BUFFER_SIZE ? HID_BUFFER_SIZE : command.length - offset); System.arraycopy(command, offset, transferBuffer, 0, blockSize); requestOut.queue(ByteBuffer.wrap(transferBuffer), HID_BUFFER_SIZE); connection.requestWait(); offset += blockSize; } requestOut.close(); ByteBuffer responseBuffer = ByteBuffer.allocate(HID_BUFFER_SIZE); UsbRequest requestIn = new UsbRequest(); requestIn.initialize(connection, in); while ((responseData = LedgerHelper.unwrapResponseAPDU(LEDGER_DEFAULT_CHANNEL, response.toByteArray(), HID_BUFFER_SIZE)) == null) { responseBuffer.clear(); requestIn.queue(responseBuffer, HID_BUFFER_SIZE); connection.requestWait(); responseBuffer.rewind(); responseBuffer.get(transferBuffer, 0, HID_BUFFER_SIZE); response.write(transferBuffer, 0, HID_BUFFER_SIZE); } requestIn.close(); if (debug) { Timber.d("<= %s", Dump.dump(responseData)); } return responseData; }