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.

    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 (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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     */
    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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    final boolean isTolerationEnabled = tolerationLength >= 0;
    DataInputStream in = new DataInputStream(tracker);
    Byte opcode = null;
    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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                            "Unsupported version " + logVersion;


      while (true) {
        if (isTolerationEnabled) {
          //mark position could be reset in case of exceptions
          in.mark(TRANSACTION_LENGTH_LIMIT); 
        }


        long timestamp = 0;
        long mtime = 0;
        long atime = 0;

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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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     */
    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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     */
    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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