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

        IOUtils.readFully(inp, header);
        LongField signature = new LongField(HeaderBlockConstants._signature_offset, header);


        // Wind back those 8 bytes
        if(inp instanceof PushbackInputStream) {
            PushbackInputStream pin = (PushbackInputStream)inp;
            pin.unread(header);
        } else {
            inp.reset();
        }
        
        // Did it match the signature?

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   * Takens an InputStream, verifies that it's not RTF, builds a
   *  POIFSFileSystem from it, and returns that.
   */
  public static POIFSFileSystem verifyAndBuildPOIFS(InputStream istream) throws IOException {
  // Open a PushbackInputStream, so we can peek at the first few bytes
  PushbackInputStream pis = new PushbackInputStream(istream,6);
  byte[] first6 = new byte[6];
  pis.read(first6);


  // Does it start with {\rtf ? If so, it's really RTF
  if(first6[0] == '{' && first6[1] == '\\' && first6[2] == 'r'
    && first6[3] == 't' && first6[4] == 'f') {
    throw new IllegalArgumentException("The document is really a RTF file");
  }


  // OK, so it's not RTF
  // Open a POIFSFileSystem on the (pushed back) stream
  pis.unread(first6);
  return new POIFSFileSystem(pis);
  }

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      byte[] reqBytes= reqStr.toString().getBytes();


      req.write(reqBytes);
      req.flush();
        
      PushbackInputStream in =                  // process response
        new PushbackInputStream(
          new BufferedInputStream(socket.getInputStream(), Http.BUFFER_SIZE), 
          Http.BUFFER_SIZE) ;


      StringBuffer line = new StringBuffer();

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            if (encoding == null || encoding.toLowerCase().indexOf("utf") != -1) {
                byte bom[] = new byte[4];
                int unread;


                // auto-detect byte-order-mark
                @SuppressWarnings("resource")
                PushbackInputStream pushbackInputStream = new PushbackInputStream(inputStream, bom.length);
                int n = pushbackInputStream.read(bom, 0, bom.length);


                // Read ahead four bytes and check for BOM marks.
                if ((bom[0] == (byte) 0xEF) && (bom[1] == (byte) 0xBB) && (bom[2] == (byte) 0xBF)) {
                    encoding = "UTF-8";
                    unread = n - 3;
                } else if ((bom[0] == (byte) 0xFE) && (bom[1] == (byte) 0xFF)) {
                    encoding = "UTF-16BE";
                    unread = n - 2;
                } else if ((bom[0] == (byte) 0xFF) && (bom[1] == (byte) 0xFE)) {
                    encoding = "UTF-16LE";
                    unread = n - 2;
                } else if ((bom[0] == (byte) 0x00) && (bom[1] == (byte) 0x00) && (bom[2] == (byte) 0xFE)
                        && (bom[3] == (byte) 0xFF)) {
                    encoding = "UTF-32BE";
                    unread = n - 4;
                } else if ((bom[0] == (byte) 0xFF) && (bom[1] == (byte) 0xFE) && (bom[2] == (byte) 0x00)
                        && (bom[3] == (byte) 0x00)) {
                    encoding = "UTF-32LE";
                    unread = n - 4;
                } else {
                    unread = n;
                }


                if (unread > 0) {
                    pushbackInputStream.unread(bom, (n - unread), unread);
                } else if (unread < -1) {
                    pushbackInputStream.unread(bom, 0, 0);
                }


                inputStream = pushbackInputStream;
            }

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    }


    private InputStream getInputStream() throws MetaModelException {
        InputStream inputStream = _resource.read();
        if (!inputStream.markSupported()) {
            inputStream = new PushbackInputStream(inputStream, 8);
        }
        return inputStream;
    }

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        IOUtils.readFully(inp, header);
        LongField signature = new LongField(HeaderBlockConstants._signature_offset, header);


        // Wind back those 8 bytes
        if(inp instanceof PushbackInputStream) {
            PushbackInputStream pin = (PushbackInputStream)inp;
            pin.unread(header);
        } else {
            inp.reset();
        }


        // Did it match the signature?

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     * @since 1.3
     */
    public XmlHeaderAwareReader(final InputStream in) throws UnsupportedEncodingException, IOException {
        final PushbackInputStream[] pin = new PushbackInputStream[]{in instanceof PushbackInputStream
            ? (PushbackInputStream)in
            : new PushbackInputStream(in, 64)};
        final Map<String, String> header = getHeader(pin);
        version = Double.parseDouble(header.get(KEY_VERSION));
        reader = new InputStreamReader(pin[0], header.get(KEY_ENCODING));
    }

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        for (i = pushbackData.length; i-- > 0;) {
            final byte b = pushbackData[i];
            try {
                in[0].unread(b);
            } catch (final IOException ex) {
                in[0] = new PushbackInputStream(in[0], ++i);
            }
        }
        return header;
    }

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        }


        if (in instanceof PushbackInputStream) {
            this.in = (PushbackInputStream) in;
        } else {
            this.in = new PushbackInputStream(in);
        }
        this.chunkSize = chunkSize;
    }

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  private int line;
  
  private int column;
  
  public JSMin(InputStream in, OutputStream out) {
    this.in = new PushbackInputStream(in);
    this.out = out;
    this.line = 0;
    this.column = 0;
  }

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