Examples of java.io.PushbackInputStream.unread()

java.io.PushbackInputStream.unread()
Pushes back a byte by copying it to the front of the pushback buffer. After this method returns, the next byte to be read will have the value (byte)b. @param b the int value whose low-order byte is to be pushed back. @exception IOException If there is not enough room in the pushbackbuffer for the byte, or this input stream has been closed by invoking its {@link #close()} method.

        {
            try
            {
                PushbackInputStream pushbackStream = new PushbackInputStream((InputStream)src);
                int firstByte = pushbackStream.read();
                pushbackStream.unread((byte)firstByte);
                
                if (this.checkStreamHeader((byte)firstByte))
                {
                    return super.doTransform(pushbackStream, encoding);
                }

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            result.setPayload(pb);
            
            int b = pb.read();
            if (b != -1)
            {
                pb.unread(b);
                return pb;
            }
        }
        
        return null;

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      IOUtils.readFully(inp, header);


        // Wind back those 4 bytes
        if(inp instanceof PushbackInputStream) {
          PushbackInputStream pin = (PushbackInputStream)inp;
          pin.unread(header);
        } else {
          inp.reset();
        }
      
      // Did it match the ooxml zip signature?

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        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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    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);
  }


  /**
   * This constructor loads a Word document from an InputStream.

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        IOUtils.readFully(inp, header);


        // Wind back those 4 bytes
        if(inp instanceof PushbackInputStream) {
            PushbackInputStream pin = (PushbackInputStream)inp;
            pin.unread(header);
        } else {
            inp.reset();
        }


        // Did it match the ooxml zip signature?

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            /*
             * We read something without a problem, so it's a valid zlib stream. Just need to reset
             * and return an unused InputStream now.
             */
            pushback.unread(peeked, 0, headerLength);
            return new DeflateStream(pushback, new Inflater());
        } catch (final DataFormatException e) {


            /* Presume that it's an RFC1951 deflate stream rather than RFC1950 zlib stream and try
             * again. */

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            return new DeflateStream(pushback, new Inflater());
        } catch (final DataFormatException e) {


            /* Presume that it's an RFC1951 deflate stream rather than RFC1950 zlib stream and try
             * again. */
            pushback.unread(peeked, 0, headerLength);
            return new DeflateStream(pushback, new Inflater(true));
        } finally {
            inf.end();
        }
    }

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        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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        IOUtils.readFully(inp, header);


        // Wind back those 4 bytes
        if(inp instanceof PushbackInputStream) {
            PushbackInputStream pin = (PushbackInputStream)inp;
            pin.unread(header);
        } else {
            inp.reset();
        }


        // Did it match the ooxml zip signature?

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