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.

            String orgName = config.getBootImage().getAbsolutePath();
            File orgFile = new File(orgName);


            // Compute the checksum over all 32-bit words starting at byte offset 64
            FileInputStream fis = new FileInputStream(orgFile);
            fis.skip(64);
            long checksum = 0;
            byte[] buffer = new byte[0x2000];
            while (fis.available() > 0) {
                int len = fis.read(buffer);
                for (int i = 0; i < len;) {

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     final int toRead = (int) Math.min(iMaxSize, fileSize - offset);
     buffer = new byte[toRead];


     try {
       in.skip(offset);
       in.read(buffer);
       last = offset + toRead >= fileSize;


     } finally {
       try {

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      }
      if(isRange()){
        System.out.println("Byte range: "+startByte+" - "+(getRangeSize()>0?endByte:""));
        long skipped=0;
        while(skipped<startByte){
          skipped+=is.skip(startByte);
        }
        ftc.writeAllData(is, endByte-startByte+1);
        
      }else{
        ftc.writeAllData(is);

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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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    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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                }
            } else {
                buffer = new byte[(int) newPaddingSize];


                // skip the tag
                inStream.skip(mp3start);


                // write zeros for the tag
                outStream.write(buffer, 0, buffer.length);
            }
            buffer = new byte[1024];

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                // Create a buffer and an input stream for the file
                final FileInputStream inputStream = new FileInputStream(this.file);
                byte buffer[] = new byte[DEFAULT_BUFFER_SIZE];


                // Put the file pointer at the right position
                final long nbBytesSkipped = inputStream.skip(this.index.getOffsetOfLine(lineNumber));
                JTailLogger.debug("Offset of line {} : {}", lineNumber, this.index.getOffsetOfLine(lineNumber));
                JTailLogger.debug("Skipped {} bytes", nbBytesSkipped);


                // Read the file
                int totalNbCharRead = 0;

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    public GribRecord getRecord(int iRecord) throws BadGribException {
        long pos=arrRecordsPos[iRecord];
        try {
            FileInputStream in = new FileInputStream(gribFile);
            GribRecord gr;
            in.skip(pos);
            gr = new GribRecord(in);
            in.close();
            
            return gr;
        } catch (FileNotFoundException e) {

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                            public int available() throws IOException {
                                return (int) dataLen;
                            }
                        };
                        fis.skip(startFrom);


                        res = new Response(HTTP_PARTIALCONTENT, mime, fis);
                        res.addHeader("Content-Length", "" + dataLen);
                        res.addHeader("Content-Range", "bytes " + startFrom + "-" + endAt + "/" + fileLen);
                        res.addHeader("ETag", etag);

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     */
    protected BufferedReader getLogFileReader(long fromFilePosition) {
        FileInputStream file = null;
        try {
            file = new FileInputStream(getLogFileName());
            long bytesSkipped = file.skip(fromFilePosition);
            if (bytesSkipped != fromFilePosition) {
                if (LogFacade.LOGGING_LOGGER.isLoggable(Level.FINE)) { 
                    LogFacade.LOGGING_LOGGER.log(Level.FINE, "Did not skip exact bytes while positioning reader in " + getLogFileName());
                }
            }

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