git.useribm.hu - mediacube.git/blob

   1 package user.commons.nexio.server.protocol;
   2
   3 import java.io.IOException;
   4 import java.nio.ByteBuffer;
   5 import java.nio.ByteOrder;
   6 import java.util.Calendar;
   7
   8 public class GetExtendedFieldGetModifiedTimestampCommand extends Command {
   9
  10         private final static byte[] GET_EXTENDED_FIELD = { (byte) 0xc9, (byte) 0xc3 };
  11         private final static byte[] EXTENDED_FIELD_NUMBER = { (byte) 20 };
  12
  13         private byte[] buffer;
  14         private byte filetime[];
  15
  16         public GetExtendedFieldGetModifiedTimestampCommand(Connection connection) {
  17                 super(connection);
  18         }
  19
  20         private Calendar convertFromFILETIME(byte[] filetime) {
  21                 Calendar result = Calendar.getInstance();
  22
  23                 ByteBuffer b = ByteBuffer.wrap(filetime);
  24                 b.order(ByteOrder.LITTLE_ENDIAN);
  25                 int lo = b.asIntBuffer().get(0);
  26                 int hi = b.asIntBuffer().get(1);
  27
  28                 long wFILETIME = ((long) hi << 32) + lo;
  29
  30                 final long EPOCH_DIFF = 11644473600000L;
  31                 final long ms_since_16010101 = wFILETIME / (10000);
  32                 final long ms_since_19700101 = ms_since_16010101 - EPOCH_DIFF;
  33
  34                 result.setTimeInMillis(ms_since_19700101);
  35
  36                 return result;
  37         }
  38
  39         public Calendar execute(Id id) throws IOException, ProtocolException {
  40
  41                 Calendar ret = null;
  42
  43                 connection.write(GET_EXTENDED_FIELD);
  44                 connection.write(id.get().getBytes());
  45                 connection.write(EXTENDED_FIELD_NUMBER);
  46                 connection.flush();
  47
  48                 buffer = new byte[2];
  49                 int c = connection.read(buffer, 0, 2);
  50                 if (c < 2) {
  51                         throw getException_InvalidResponseLength(c, 2, 2);
  52                 }
  53
  54                 // Not found
  55                 if (buffer[0] == (byte) 0xd0 && buffer[1] == (byte) 0xc3) {
  56                         throw new ProtocolException("ID handle is not found!");
  57                 } else
  58                 // 1. Found
  59                 if (buffer[0] == (byte) 0xdf && buffer[1] == (byte) 0xc3) {
  60
  61                         // 2. read NOF BYTES
  62                         buffer = new byte[1];
  63                         c = connection.read(buffer, 0, 1);
  64
  65                         int toRead = buffer[0];
  66                         if (toRead != 8) {
  67                                 throw new ProtocolException("Invalid ModifiedTimeStamp's data length: " + toRead);
  68                         } else {
  69                                 filetime = new byte[8];
  70                                 c = connection.read(filetime, 0, 8);
  71                                 if (c != 8) {
  72                                         throw getException_InvalidResponseLength(c, 8, 8);
  73                                 }
  74                                 ret = convertFromFILETIME(filetime);
  75                         }
  76                 }
  77                 return ret;
  78         }
  79 }