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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        info.size = _storage.getSize(qcow2Path);
        FileInputStream strm = null;
        byte[] b = new byte[8];
        try {
            strm = new FileInputStream(qcow2File);
            strm.skip(24);
            strm.read(b);
        } catch (Exception e) {
            s_logger.warn("Unable to read qcow2 file " + qcow2Path, e);
            return null;
        } finally {

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     public Long getVirtualSize(File file) {
         FileInputStream strm = null;
         byte[] b = new byte[8];
         try {
             strm = new FileInputStream(file);
             strm.skip(24);
             strm.read(b);
         } catch (Exception e) {
             s_logger.warn("Unable to read qcow2 file " + file, e);
             return null;
         } finally {

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        FileInputStream strm = null;
        byte[] currentSize = new byte[8];
        byte[] creatorApp = new byte[4];
        try {
            strm = new FileInputStream(vhdFile);
            strm.skip(info.size - vhd_footer_size + vhd_footer_creator_app_offset);
            strm.read(creatorApp);
            strm.skip(vhd_footer_current_size_offset - vhd_footer_creator_ver_offset);
            strm.read(currentSize);           
        } catch (Exception e) {
            s_logger.warn("Unable to read vhd file " + vhdPath, e);

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        byte[] creatorApp = new byte[4];
        try {
            strm = new FileInputStream(vhdFile);
            strm.skip(info.size - vhd_footer_size + vhd_footer_creator_app_offset);
            strm.read(creatorApp);
            strm.skip(vhd_footer_current_size_offset - vhd_footer_creator_ver_offset);
            strm.read(currentSize);           
        } catch (Exception e) {
            s_logger.warn("Unable to read vhd file " + vhdPath, e);
            throw new InternalErrorException("Unable to read vhd file " + vhdPath + ": " + e);
        } finally {

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        FileInputStream strm = null;
        byte[] currentSize = new byte[8];
        byte[] creatorApp = new byte[4];
        try {
            strm = new FileInputStream(file);
            strm.skip(file.length() - vhd_footer_size + vhd_footer_creator_app_offset);
            strm.read(creatorApp);
            strm.skip(vhd_footer_current_size_offset - vhd_footer_creator_ver_offset);
            strm.read(currentSize);
        } catch (Exception e) {
            s_logger.warn("Unable to read vhd file " + file.getAbsolutePath(), e);

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        byte[] creatorApp = new byte[4];
        try {
            strm = new FileInputStream(file);
            strm.skip(file.length() - vhd_footer_size + vhd_footer_creator_app_offset);
            strm.read(creatorApp);
            strm.skip(vhd_footer_current_size_offset - vhd_footer_creator_ver_offset);
            strm.read(currentSize);
        } catch (Exception e) {
            s_logger.warn("Unable to read vhd file " + file.getAbsolutePath(), e);
            throw new CloudRuntimeException("Unable to read vhd file " + file.getAbsolutePath() + ": " + e);
        } finally {

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  // Default to full reply then
  reply = createDefaultReply(request, HTTP.OK) ;
  try { 
      FileInputStream fis = new FileInputStream(file);
      // and escape the headers
      fis.skip(foffset);
      reply.setStream(fis);
  } catch (IOException ex) {
      Reply error = request.makeReply(HTTP.SERVICE_UNAVAILABLE);
      error.setContent(ex.getMessage());
      return error;

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        FileInputStream file = null;
        try {
            file = new FileInputStream(getLogFileName());
            long bytesToSkip = fromFilePosition-1;
            if (bytesToSkip > 0) {
                long bytesSkipped = file.skip(bytesToSkip);
                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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    public void test_skipNegativeArgumentJ() throws IOException{
        
        FileInputStream fis = new java.io.FileInputStream(fileName);


        try {
            fis.skip(-5);
            fail("IOException must be thrown if number of bytes to skip <0");
        } catch (IOException e) {
            // Expected IOException
        }

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