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.

        fis.close();
        
        fis = new FileInputStream(fileName);
        assertEquals(0, fis.getChannel().position());
        bs = new byte[10];
        fis.skip(100);
        assertEquals(100, fis.getChannel().position());
        r = fis.read(bs);
        assertEquals(110, fis.getChannel().position());
        fis.close();
    }

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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
        } catch (Exception e) {
            fail("IOException expected, but found: " + e.getMessage());

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   */
  public static Reader getReader(File _f, String encoding) throws IOException {
    int BOMType = getBOMType(_f);
    int skipBytes = getSkipBytes(BOMType);
    FileInputStream fIn = new FileInputStream(_f);
    fIn.skip(skipBytes);
    Reader reader = new InputStreamReader(fIn, encoding);
    return reader;
  }
}

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        // Look up for ID3v1 tag
        if ((size == mediaLength) && (mediaLength != AudioSystem.NOT_SPECIFIED))
        {
            FileInputStream fis = (FileInputStream) inputStream;
            byte[] id3v1 = new byte[128];
            long bytesSkipped = fis.skip(inputStream.available() - id3v1.length);
            int read = fis.read(id3v1, 0, id3v1.length);
            if ((id3v1[0] == 'T') && (id3v1[1] == 'A') && (id3v1[2] == 'G'))
            {
                parseID3v1Frames(id3v1, aff_properties);
            }

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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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        {
            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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                        inputStream = header.isBase64() ? new Base64InputStream(bis): bis;
                    }
                    try{
                        long nSkip;
                        long toSkip=header.getHeaderSize();
                        while((nSkip=fis.skip(toSkip))!=toSkip){
                            if(-1==nSkip) throw new RuntimeException("Unexcepted end of file in chunk file "+in.getCanonicalPath());
                            toSkip-=nSkip;
                        }
                        raf.seek(header.dataOffset);
                        int nRead;

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            }


            final FileInputStream fis = new FileInputStream(file);


            if (pos > 0) {
                final long actualPos = fis.skip(pos);
            }


            final BufferedInputStream  bis = new BufferedInputStream(fis);
            final CountdownInputStream cis = new CountdownInputStream(bis);

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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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