Examples of java.io.DataInputStream.reset()

java.io.DataInputStream.reset()
Repositions this stream to the position at the time the mark method was last called on this input stream.
This method simply performs in.reset().
Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parse, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails. If this happens within readlimit bytes, it allows the outer code to reset the stream and try another parser. @exception IOException if the stream has not been marked or if themark has been invalidated.

      int status = dis.readUnsignedByte();
      int length = 0;
      //check running status
      if(status < 0x80){
        status = oldStatus;
        dis.reset();
      }
      if(status >= 0xFF){//MetaEvent
        int type = dis.readUnsignedByte();
        length = MidiUtil.readVarLength(dis);
        event = MidiUtil.createMetaEvent(type);

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                smfParser.tracks = numtracks;
            }
        } finally {
            // if only reading the file format, reset the stream
            if (smfParser == null) {
                dis.reset();
            }
        }
        MidiFileFormat format = new MidiFileFormat(type, divisionType, resolution, fileLength, duration);
        return format;
    }

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      else
      { // a stream combines the 1st 4 bytes into the total (no reassembly)
        len = Swap.Long(ds.readInt());
        // now do some fancy footwork ...
        umsgSizeInBytes = len - 2; // keep the byte counting intact ...
        ds.reset(); // go back to the beginning and ...
        ds.readShort(); // move over the first 2 bytes
      }
      if (TLinkFactory.debugLevel > 1) DbgLog.log("TPHdr","recv : " + length + " bytes (hdr " + len + " bytes)");
      if (len < length)
      {

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          DbgLog.log("TPHdr","data : " + "bytes " + umsgSizeInBytes + ", blknum " + blknum + " from " + numblks + " <" + lnkCompCode + ">");
        bytesread += umsgSizeInBytes;
        if (lockout) continue; // simulate total timeout conditions
        if (lnk.getTineProtocol() == 5)
        { // go back to the mark
          ds.reset();
          dTimeStampUSEC = (int)Swap.Short(ds.readShort()) * 1000;
          dFormat = (short)ds.readByte();
          lnkCounter = (short)ds.readByte();
          dTimeStamp = Swap.Long(ds.readInt());
          lnkStarttime = Swap.Long(ds.readInt());

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      else
      { // a stream combines the 1st 4 bytes into the total (no reassembly)
        len = Swap.Long(ds.readInt());
        // now do some fancy footwork ...
        umsgSizeInBytes = len - 2; // keep the byte counting intact ...
        ds.reset(); // go back to the beginning and ...
        ds.readShort(); // move over the first 2 bytes
      }
      if (TLinkFactory.debugLevel > 1) DbgLog.log("TPHdr","recv : " + length + " bytes (hdr " + len + " bytes)");
      if (len < length)
      {

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        logVersion = in.readByte();
      } catch (EOFException e) {
        available = false;
      }
      if (available) {
        in.reset();
        if (logVersion >= 0)
          logVersion = 0;
        else
          logVersion = in.readInt();
        if (logVersion < FSConstants.LAYOUT_VERSION) // future version

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                smfParser.tracks = numtracks;
            }
        } finally {
            // if only reading the file format, reset the stream
            if (smfParser == null) {
                dis.reset();
            }
        }
        MidiFileFormat format = new MidiFileFormat(type, divisionType, resolution, fileLength, duration);
        return format;
    }

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        This.fTrie = new CharTrie(dis, fTrieFoldingFunc);  // Deserialize the TRIE, leaving input
                                                //  stream at an unknown position, preceding the
                                                //  padding between TRIE and following section.
    
        dis.reset();                            // Move input stream back to marked position at
                                                //   the start of the serialized TRIE.  Now our
                                                //   "pos" variable and the input stream are in
                                                //   agreement.
        
        //

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        data = new byte[length];
        writeInt(rootRes, data, 0);
        writeInt(indexLength, data, 4);


        // now reset to the mark, which was set after reading rootRes and indexLength
        ds.reset();
        ds.readFully(data, 8, length-8);
    }


    /**
     * Gets the full name of the resource with suffix.

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        PFBData pfb = new PFBData();
        BufferedInputStream bin = new BufferedInputStream(in);
        DataInputStream din = new DataInputStream(bin);
        din.mark(32);
        int firstByte = din.readUnsignedByte();
        din.reset();
        if (firstByte == 128) {
            pfb.setPFBFormat(PFBData.PFB_PC);
            parsePCFormat(pfb, din);
        } else {
            pfb.setPFBFormat(PFBData.PFB_RAW);

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