Do bulk transfers in chunks so devices before 4.3 can be supported

Author: cgutman

AndroidManifest.xml

@@ -6,7 +6,7 @@
     <uses-feature android:name="android.hardware.usb.host" />
 
     <uses-sdk
-        android:minSdkVersion="18"
+        android:minSdkVersion="12"
         android:targetSdkVersion="19" />
 
     <uses-permission android:name="android.permission.INTERNET" />

src/org/cgutman/usbip/service/UsbIpService.java

@@ -190,15 +190,27 @@ public void run() {
 
 					int bytesTransferred = 0;
 					while (bytesTransferred < bulkBuffer.length) {
-						int res = context.devConn.bulkTransfer(selectedEndpoint, bulkBuffer, bytesTransferred,
-								bulkBuffer.length - bytesTransferred, msg.interval);
+						byte[] remainingBuffer = new byte[bulkBuffer.length - bytesTransferred];
+						
+						if (msg.direction == UsbIpDevicePacket.USBIP_DIR_OUT) {
+							// Copy input data into the new buffer
+							System.arraycopy(bulkBuffer, bytesTransferred, remainingBuffer, 0, remainingBuffer.length);
+						}
+						
+						int res = context.devConn.bulkTransfer(selectedEndpoint, remainingBuffer,
+								remainingBuffer.length, msg.interval);
 						if (res < 0) {
 							// Failed transfer terminates the bulk transfer
 							System.err.println("Bulk Xfer failed: "+res);
 							sendReply(replyOut, reply, ProtoDefs.ST_NA);
 							return;
 						}
 
+						if (msg.direction == UsbIpDevicePacket.USBIP_DIR_IN) {
+							// Copy output data into the original buffer
+							System.arraycopy(remainingBuffer, 0, bulkBuffer, bytesTransferred, res);
+						}
+						
 						bytesTransferred += res;
 
 						if (res < selectedEndpoint.getMaxPacketSize()) {