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 lastIndex = header.numRecords - 1;


            for (int i = 0; i < lastIndex; i++) {


                //dis.seek(recOffset[i]);
    dis.reset();
    dis.skip(recOffset[i]);
                len = recOffset[i+1] - recOffset[i];
                bytes = new byte[len];
                dis.readFully(bytes);
                recArray[i] = new Record(bytes, recAttrs[i]);

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                recArray[i] = new Record(bytes, recAttrs[i]);
            }
     
            // last record
          
            dis.reset();
      len = (int) dis.available() - recOffset[lastIndex];
      dis.skip(recOffset[lastIndex]);     
      bytes = new byte[len];
            dis.readFully(bytes);
            recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]);

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            byte[] data1 = new byte[sourceData1.length];
            byte[] data2 = new byte[sourceData2.length];
            in.readFully(data1);
            in.mark(sourceData2.length);
            in.readFully(data2);
            in.reset();
            in.readFully(data2);
            assertTrue(Arrays.equals(sourceData1, data1));
            assertTrue(Arrays.equals(sourceData2, data2));
        } finally {
            releaseBlob(blob);

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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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        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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            int lastIndex = header.numRecords - 1;


            for (int i = 0; i < lastIndex; i++) {


                //dis.seek(recOffset[i]);
    dis.reset();
    dis.skip(recOffset[i]);
                len = recOffset[i+1] - recOffset[i];
                bytes = new byte[len];
                dis.readFully(bytes);
                recArray[i] = new Record(bytes, recAttrs[i]);

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                recArray[i] = new Record(bytes, recAttrs[i]);
            }
     
            // last record
          
            dis.reset();
      len = (int) dis.available() - recOffset[lastIndex];
      dis.skip(recOffset[lastIndex]);     
      bytes = new byte[len];
            dis.readFully(bytes);
            recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]);

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            int lastIndex = header.numRecords - 1;


            for (int i = 0; i < lastIndex; i++) {


                //dis.seek(recOffset[i]);
    dis.reset();
    dis.skip(recOffset[i]);
                len = recOffset[i+1] - recOffset[i];
                bytes = new byte[len];
                dis.readFully(bytes);
                recArray[i] = new Record(bytes, recAttrs[i]);

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                recArray[i] = new Record(bytes, recAttrs[i]);
            }
     
            // last record
          
            dis.reset();
      len = (int) dis.available() - recOffset[lastIndex];
      dis.skip(recOffset[lastIndex]);     
      bytes = new byte[len];
            dis.readFully(bytes);
            recArray[lastIndex] = new Record(bytes, recAttrs[lastIndex]);

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        // Read it all (less than 32k).  Seeking around (using
        // mark/reset/skipBytes) doesn't work directly on the file,
        // but it works fine if we read everything into a byte[] array
        // first.
        byte raw[] = new byte[total_size];
        d.reset();
        d.readFully(raw);
        d.close();


        Builder builder = new Builder(raw);

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