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.

              new FileInputStream(editsFile)));
      // Read log file version. Could be missing. 
      in.mark( 4 );
      if( in.available() > 0 ) {
        logVersion = in.readByte();
        in.reset();
        if( logVersion >= 0 )
          logVersion = 0;
        else
          logVersion = in.readInt();
        if( logVersion < FSConstants.DFS_CURRENT_VERSION ) // future version

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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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        logVersion = in.readByte();
      } catch (EOFException e) {
        available = false;
      }
      if (available) {
        in.reset();
        logVersion = in.readInt();
        if (logVersion < FSConstants.LAYOUT_VERSION) // future version
          throw new IOException(
                          "Unexpected version of the file system log file: "
                          + logVersion + ". Current version = "

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        msg += sb.append("]");
      }


      LOG.warn(msg, t);
      if (isTolerationEnabled) {
        in.reset(); //reset to the beginning position of this transaction
      } else {
        //edit log toleration feature is disabled
        MetaRecoveryContext.editLogLoaderPrompt(msg, recovery);
      }
    } finally {

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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.DFS_CURRENT_VERSION ) // future version

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        logVersion = in.readByte();
      } catch (EOFException e) {
        available = false;
      }
      if (available) {
        in.reset();
        logVersion = in.readInt();
        if (logVersion < FSConstants.LAYOUT_VERSION) // future version
          throw new IOException(
                          "Unexpected version of the file system log file: "
                          + logVersion + ". Current version = "

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            try {
                in.mark(4 + 1);


                DataInputStream din = new DataInputStream(in);
                int magic = EndianUtils.swapInteger(din.readInt());
                din.reset();
                if (magic != WMFConstants.META_ALDUS_APM) {
                    return null; //Not a WMF file
                }


                WMFRecordStore wmfStore = new WMFRecordStore();

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

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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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