Examples of java.io.FileInputStream.skip()

java.io.FileInputStream.skip()
Skips over and discards n bytes of data from the input stream.
The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. If n is negative, an IOException is thrown, even though the skip method of the {@link InputStream} superclass does nothing in this case.The actual number of bytes skipped is returned.
This method may skip more bytes than are remaining in the backing file. This produces no exception and the number of bytes skipped may include some number of bytes that were beyond the EOF of the backing file. Attempting to read from the stream after skipping past the end will result in -1 indicating the end of the file. @param n the number of bytes to be skipped. @return the actual number of bytes skipped. @exception IOException if n is negative, if the stream does notsupport seek, or if an I/O error occurs.

        {
            fIn = new FileInputStream(pdfFile);


            final int trailByteCount = (fileLen < readTrailBytes) ? (int) fileLen : readTrailBytes;
            buf = new byte[trailByteCount];
            fIn.skip(skipBytes = fileLen - trailByteCount);


            int off = 0;
            int readBytes;
            while (off < trailByteCount)
            {

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        //open the map-output file
        mapOutputIn = SecureIOUtils.openForRead(
            new File(mapOutputFileName.toUri().getPath()), runAsUserName);


        //seek to the correct offset for the reduce
        mapOutputIn.skip(info.startOffset);
        long rem = info.partLength;
        int len =
          mapOutputIn.read(buffer, 0, (int)Math.min(rem, MAX_BYTES_TO_READ));
        while (rem > 0 && len >= 0) {
          rem -= len;

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        //open the map-output file
        mapOutputIn = SecureIOUtils.openForRead(
            new File(mapOutputFileName.toUri().getPath()), runAsUserName);


        //seek to the correct offset for the reduce
        mapOutputIn.skip(info.startOffset);
        long rem = info.partLength;
        int len =
          mapOutputIn.read(buffer, 0, (int)Math.min(rem, MAX_BYTES_TO_READ));
        while (rem > 0 && len >= 0) {
          rem -= len;

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        {
            fIn = new FileInputStream(pdfFile);


            final int trailByteCount = (fileLen < readTrailBytes) ? (int) fileLen : readTrailBytes;
            buf = new byte[trailByteCount];
            fIn.skip(skipBytes = fileLen - trailByteCount);


            int off = 0;
            int readBytes;
            while (off < trailByteCount)
            {

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      String folder = prj.getCanonicalPath();
      folder = folder.substring(0, folder.lastIndexOf(System.getProperty("file.separator")));


      //skips the header in .prj
      in.skip(PRJ_HEADER_BYTE_SIZE);


      //int c;
      int read;


      //reading project name.

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    byte flags = (byte)(compressedBuf[3] & 0xff);
    if ((flags & 0x04) != 0) {   // FEXTRA
      numBytesRead = in.read(compressedBuf, 0, 2);
      assertEquals("XLEN bytes read", 2, numBytesRead);
      int xlen = ((compressedBuf[1] << 8) | compressedBuf[0]) & 0xffff;
      in.skip(xlen);
    }
    if ((flags & 0x08) != 0) {   // FNAME
      while ((numBytesRead = in.read()) != 0) {
        assertFalse("unexpected end-of-file while reading filename",
                    numBytesRead == -1);

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            //new File(mapOutputFileName.toUri().getPath()), runAsUserName);


        ReadaheadRequest curReadahead = null;
        
        //seek to the correct offset for the reduce
        mapOutputIn.skip(info.startOffset);
        long rem = info.partLength;
        long offset = info.startOffset;
        while (rem > 0) {
          if (tracker.manageOsCacheInShuffle && tracker.readaheadPool != null) {
            curReadahead = tracker.readaheadPool.readaheadStream(filePath,

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        ReusableBuffer result = client.chunk(testFileName, start, end).get();
        assertEquals(end - start, result.remaining());
        
        byte[] testData = new byte[end - start];
        FileInputStream sIn = new FileInputStream(testFileName);
        sIn.skip(start);
        sIn.read(testData, 0, end - start);
        sIn.close();
        
        assertEquals(new String(testData), new String(result.array()));

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   *             if block cannot be read
   */
  public MapBlock read() throws IOException {
    FileInputStream fis = new FileInputStream(this.file);


    long skippedBytes = fis.skip(sequentialIndex);
    if (skippedBytes != sequentialIndex) {
      throw new IOException("Cannot jump to block position.");
    }
    // a block contains 196 bytes
    sequentialIndex = sequentialIndex + MAP_BLOCK_LENGTH;

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      throw new IOException("Given coordinates are outside of map.");
    }
    int blockIndex = (x * MAP_HEIGHT) + y;


    FileInputStream fis = new FileInputStream(this.file);
    long skippedBytes = fis.skip(blockIndex * MAP_BLOCK_LENGTH);
    if (skippedBytes != (blockIndex * MAP_BLOCK_LENGTH)) {
      throw new IOException("Cannot read map block at given coordinates.");
    }


    try {

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