Examples of java.io.DataInputStream.mark()

java.io.DataInputStream.mark()
Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.
The readlimit argument tells this input stream to allow that many bytes to be read before the mark position gets invalidated.
This method simply performs in.mark(readlimit). @param readlimit the maximum limit of bytes that can be read beforethe mark position becomes invalid.

                        if (dis.available() > 0)
                        {
                            // We have to skip any preamble to read the certificate
                            do
                            {
                                dis.mark(BEGIN_CERTIFICATE.length() * 2) ;
                                final String line = dis.readLine() ;
                                if (BEGIN_CERTIFICATE.equals(line))
                                {
                                    dis.reset() ;
                                    break ;

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    long startTime = FSNamesystem.now();


    DataInputStream in = new DataInputStream(new BufferedInputStream(edits));
    try {
      // Read log file version. Could be missing. 
      in.mark(4);
      // If edits log is greater than 2G, available method will return negative
      // numbers, so we avoid having to call available
      boolean available = true;
      try {
        logVersion = in.readByte();

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        // original comments indicated that we need to use read(byte[]) rather than readInt()
        // to avoid socket timeouts - don't understand, but don't want to risk change.


        // first read the data necessary to know the length of the payload
        DataInputStream dis = new DataInputStream(is);
        dis.mark(SIZE_INT);
        // this pulls through SIZE_INT bytes
        if (null == super.read(dis, SIZE_INT))
        {
            return null; // eof
        }

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    if (edits != null) {
      DataInputStream in = new DataInputStream(
                                               new BufferedInputStream(
                                                                       new FileInputStream(edits)));
      // Read log file version. Could be missing. 
      in.mark(4);
      // If edits log is greater than 2G, available method will return negative
      // numbers, so we avoid having to call available
      boolean available = true;
      try {
        logVersion = in.readByte();

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     */
    public PFBData parsePFB(InputStream in) throws IOException {
        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);

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    if (edits != null) {
      DataInputStream in = new DataInputStream(
          new BufferedInputStream(
              new FileInputStream(edits)));
      // Read log file version. Could be missing. 
      in.mark( 4 );
      // If edits log is greater than 2G, available method will return negative
      // numbers, so we avoid having to call available
      boolean available = true;
      try {
        logVersion = in.readByte();

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    long startTime = FSNamesystem.now();


    DataInputStream in = new DataInputStream(new BufferedInputStream(edits));
    try {
      // Read log file version. Could be missing. 
      in.mark(4);
      // If edits log is greater than 2G, available method will return negative
      // numbers, so we avoid having to call available
      boolean available = true;
      try {
        logVersion = in.readByte();

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    if (edits != null) {
      DataInputStream in = new DataInputStream(new BufferedInputStream(
                                new FileInputStream(edits)));
      try {
        // Read log file version. Could be missing. 
        in.mark(4);
        // If edits log is greater than 2G, available method will return negative
        // numbers, so we avoid having to call available
        boolean available = true;
        try {
          logVersion = in.readByte();

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     */
    public PFBData parsePFB(InputStream in) throws IOException {
        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);

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    if (editsFile.exists()) {
      DataInputStream in = new DataInputStream(
          new BufferedInputStream(
              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;

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