ndn-cpp/encoding/binary-xml-decoder.hpp

/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * @author: Jeff Thompson <jefft0@remap.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_BINARYXMLDECODER_HPP
#define NDN_BINARYXMLDECODER_HPP

#include <stdexcept>
#include "../c/errors.h"
#include "../c/encoding/binary-xml-decoder.h"

using namespace std;

namespace ndn {
  
/**
 * A BinaryXmlDecoder extends a C ndn_BinaryXmlDecoder struct and wraps related functions.
 */
class BinaryXmlDecoder : public ndn_BinaryXmlDecoder {
public:
  /**
   * Initialize the base ndn_BinaryXmlDecoder struct with the input.
   */
  BinaryXmlDecoder(const uint8_t *input, size_t inputLength) 
  {
    ndn_BinaryXmlDecoder_initialize(this, (uint8_t *)input, inputLength);
  }
  
  /**
   * Decode the header from the input starting at offset, and if it is a DTAG where the value is the expectedTag,
   * then return true, else false.  Do not update offset, including if throwing an exception.
   * @param expectedTag the expected value for DTAG
   * @return true if got the expected tag, else false
   */
  bool 
  peekDTag(unsigned int expectedTag) 
  {
    int gotExpectedTag;
    ndn_Error error;
    if ((error = ndn_BinaryXmlDecoder_peekDTag(this, expectedTag, &gotExpectedTag)))
      throw runtime_error(ndn_getErrorString(error));
    
    return gotExpectedTag;
  }
};

}

#endif