Examples of java.io.PushbackInputStream

java.io.PushbackInputStream
A PushbackInputStream adds functionality to another input stream, namely the ability to "push back" or "unread" one byte. This is useful in situations where it is convenient for a fragment of code to read an indefinite number of data bytes that are delimited by a particular byte value; after reading the terminating byte, the code fragment can "unread" it, so that the next read operation on the input stream will reread the byte that was pushed back. For example, bytes representing the characters constituting an identifier might be terminated by a byte representing an operator character; a method whose job is to read just an identifier can read until it sees the operator and then push the operator back to be re-read. @author David Connelly @author Jonathan Payne @version 1.43, 06/19/06 @since JDK1.0

  
  public static POITextExtractor createExtractor(InputStream inp) throws IOException, InvalidFormatException, OpenXML4JException, XmlException {
    // Figure out the kind of stream
    // If clearly doesn't do mark/reset, wrap up
    if(! inp.markSupported()) {
      inp = new PushbackInputStream(inp, 8);
    }
    
    if(POIFSFileSystem.hasPOIFSHeader(inp)) {
      return createExtractor(new POIFSFileSystem(inp));
    }

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    if (!(type != null && MimeTypeHelper.isAtom(type))) {
      throw new ParseException("multipart/related stream invalid, type parameter should be "
              + Constants.ATOM_MEDIA_TYPE);
    }


    PushbackInputStream pushBackInput = new PushbackInputStream(request.getInputStream(), 2);
    pushBackInput.unread("\r\n".getBytes());


    return new MultipartInputStream(pushBackInput, boundary.getBytes());
  }

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     *
     * @see <a href="http://jira.springframework.org/browse/SWS-393">SWS-393</a>
     * @see <a href="http://unicode.org/faq/utf_bom.html#22">UTF-8 BOMs</a>
     */
    private InputStream checkForUtf8ByteOrderMark(InputStream inputStream) throws IOException {
        PushbackInputStream pushbackInputStream = new PushbackInputStream(new BufferedInputStream(inputStream), 3);
        byte[] bytes = new byte[3];
        int bytesRead = 0;
      while (bytesRead < bytes.length) {
        int n = pushbackInputStream.read(bytes, bytesRead, bytes.length - bytesRead);
        if (n > 0) {
          bytesRead += n;
        } else {
          break;
        }
      }
        if (bytesRead > 0) {
            // check for the UTF-8 BOM, and remove it if there. See SWS-393
            if (!isByteOrderMark(bytes)) {
                pushbackInputStream.unread(bytes, 0, bytesRead);
            }
        }
        return pushbackInputStream;
    }

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  protected byte[] buffer;
  protected int pos;
  protected boolean rewindable;
  
  public RewindableInputStream(InputStream input, int size) {
    this.wrappedStream = new PushbackInputStream(input, size);
    this.buffer = new byte[size];
    this.pos = 0;
    this.rewindable = true;
  }

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        if (TDebug.TraceAudioFileReader) TDebug.out(">MpegAudioFileReader.getAudioFileFormat(InputStream inputStream, long mediaLength): begin");
        HashMap aff_properties = new HashMap();
        HashMap af_properties = new HashMap();
        int mLength = (int) mediaLength;
        int size = inputStream.available();
        PushbackInputStream pis = new PushbackInputStream(inputStream, MARK_LIMIT);
        byte head[] = new byte[22];
        pis.read(head);
        if (TDebug.TraceAudioFileReader)
        {
            TDebug.out("InputStream : " + inputStream + " =>" + new String(head));
        }


        // Check for WAV, AU, and AIFF, Ogg Vorbis, Flac, MAC file formats.
        // Next check for Shoutcast (supported) and OGG (unsupported) streams.
        if ((head[0] == 'R') && (head[1] == 'I') && (head[2] == 'F') && (head[3] == 'F') && (head[8] == 'W') && (head[9] == 'A') && (head[10] == 'V') && (head[11] == 'E'))
        {
            if (TDebug.TraceAudioFileReader) TDebug.out("RIFF/WAV stream found");
            int isPCM = ((head[21]<<8)&0x0000FF00) | ((head[20])&0x00000FF);
            if (weak == null)
            {
                if (isPCM == 1) throw new UnsupportedAudioFileException("WAV PCM stream found");
            }


        }
        else if ((head[0] == '.') && (head[1] == 's') && (head[2] == 'n') && (head[3] == 'd'))
        {
            if (TDebug.TraceAudioFileReader) TDebug.out("AU stream found");
            if (weak == null) throw new UnsupportedAudioFileException("AU stream found");
        }
        else if ((head[0] == 'F') && (head[1] == 'O') && (head[2] == 'R') && (head[3] == 'M') && (head[8] == 'A') && (head[9] == 'I') && (head[10] == 'F') && (head[11] == 'F'))
        {
            if (TDebug.TraceAudioFileReader) TDebug.out("AIFF stream found");
            if (weak == null) throw new UnsupportedAudioFileException("AIFF stream found");
        }
        else if (((head[0] == 'M') | (head[0] == 'm')) && ((head[1] == 'A') | (head[1] == 'a')) && ((head[2] == 'C') | (head[2] == 'c')))
        {
            if (TDebug.TraceAudioFileReader) TDebug.out("APE stream found");
            if (weak == null) throw new UnsupportedAudioFileException("APE stream found");
        }
        else if (((head[0] == 'F') | (head[0] == 'f')) && ((head[1] == 'L') | (head[1] == 'l')) && ((head[2] == 'A') | (head[2] == 'a')) && ((head[3] == 'C') | (head[3] == 'c')))
        {
            if (TDebug.TraceAudioFileReader) TDebug.out("FLAC stream found");
            if (weak == null) throw new UnsupportedAudioFileException("FLAC stream found");
        }
        // Shoutcast stream ?
        else if (((head[0] == 'I') | (head[0] == 'i')) && ((head[1] == 'C') | (head[1] == 'c')) && ((head[2] == 'Y') | (head[2] == 'y')))
        {
            pis.unread(head);
            // Load shoutcast meta data.
            loadShoutcastInfo(pis, aff_properties);
        }
        // Ogg stream ?
        else if (((head[0] == 'O') | (head[0] == 'o')) && ((head[1] == 'G') | (head[1] == 'g')) && ((head[2] == 'G') | (head[2] == 'g')))
        {
            if (TDebug.TraceAudioFileReader) TDebug.out("Ogg stream found");
            if (weak == null) throw new UnsupportedAudioFileException("Ogg stream found");
        }
        // No, so pushback.
        else
        {
            pis.unread(head);
        }
        // MPEG header info.
        int nVersion = AudioSystem.NOT_SPECIFIED;
        int nLayer = AudioSystem.NOT_SPECIFIED;
        int nSFIndex = AudioSystem.NOT_SPECIFIED;

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            if (null == boundaryString) {
                throw new IOException("Couldn't determine the boundary from the message!");
            }
            boundary = boundaryString.getBytes("utf-8");


            stream = new PushbackInputStream(message.getContent(InputStream.class),
                                             pbAmount);
            if (!readTillFirstBoundary(stream, boundary)) {
                throw new IOException("Couldn't find MIME boundary: " + boundaryString);
            }

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    }


    private String findBoundaryFromInputStream() throws IOException {
        InputStream is = message.getContent(InputStream.class);
        //boundary should definitely be in the first 2K;
        PushbackInputStream in = new PushbackInputStream(is, 4096);
        byte buf[] = new byte[2048];
        int i = in.read(buf);
        String msg = IOUtils.newStringFromBytes(buf, 0, i);
        in.unread(buf, 0, i);
        
        // Reset the input stream since we'll need it again later
        message.setContent(InputStream.class, in);


        // Use regex to get the boundary and return null if it's not found

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    private static InputStream getNonEmptyContent(
        HttpURLConnection connection
    ) {
        InputStream in = null;
        try {
            PushbackInputStream pin = 
                new PushbackInputStream(connection.getInputStream());
            int c = pin.read();
            if (c != -1) {
                pin.unread((byte)c);
                in = pin;
            }
        } catch (IOException ioe) {
            // ignore
        }

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    private String resourceName;
    
    public ValueExpressionFilterInputStream(InputStream in, String libraryName, String resourceName)
    {
        super();
        delegate = new PushbackInputStream(in,255);
    }

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        this.boundary = ("--" + contentType.getParameter("boundary"))
                .getBytes();


        // do we need to wrap InputStream from a BufferedInputStream before
        // wrapping from PushbackStream
        pushbackInStream = new PushbackInputStream(inStream,
                                                   (this.boundary.length + 2));


        // Move the read pointer to the beginning of the first part
        // read till the end of first boundary
        while (true) {

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