blob: 939c00c1d5c19846498245eb10daa4aa9afb0f28 [file] [log] [blame]
/**
* @author: Jeff Thompson
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_WIREFORMAT_HPP
#define NDN_WIREFORMAT_HPP
#include "../common.hpp"
#include <vector>
namespace ndn {
class Interest;
class Data;
class WireFormat {
public:
virtual ptr_lib::shared_ptr<std::vector<unsigned char> > encodeInterest(const Interest &interest);
virtual void decodeInterest(Interest &interest, const unsigned char *input, unsigned int inputLength);
/**
* Encode data and return the encoding. Your derived class should override.
* @param data The Data object to encode.
* @param signedFieldsBeginOffset Return the offset in the encoding of the beginning of the fields which are signed.
* If you are not encoding in order to sign, you can call encodeData(const Data &data) to ignore this returned value.
* @param signedFieldsEndOffset Return the offset in the encoding of the end of the fields which are signed.
* If you are not encoding in order to sign, you can call encodeData(const Data &data) to ignore this returned value.
* @return A shared_ptr with the vector<unsigned char> containing the encoding.
* @throw logic_error for unimplemented if the derived class does not override.
*/
virtual ptr_lib::shared_ptr<std::vector<unsigned char> > encodeData
(const Data &data, unsigned int *signedFieldsBeginOffset, unsigned int *signedFieldsEndOffset);
/**
* Encode data and return the encoding.
* @param data The Data object to encode.
* @return A shared_ptr with the vector<unsigned char> containing the encoding.
* @throw logic_error for unimplemented if the derived class does not override.
*/
ptr_lib::shared_ptr<std::vector<unsigned char> > encodeData(const Data &data)
{
unsigned int dummyBeginOffset, dummyEndOffset;
return encodeData(data, &dummyBeginOffset, &dummyEndOffset);
}
/**
* Decode input as a data packet and set the fields in the data object. Your derived class should override.
* @param data The Data object whose fields are updated.
* @param input A pointer to the input buffer to decode.
* @param inputLength The number of bytes in input.
* @param signedFieldsBeginOffset Return the offset in the input buffer of the beginning of the fields which are signed.
* If you are not decoding in order to verify, you can call
* decodeData(Data &data, const unsigned char *input, unsigned int inputLength) to ignore this returned value.
* @param signedFieldsEndOffset Return the offset in the input buffer of the end of the fields which are signed.
* If you are not decoding in order to verify, you can call
* decodeData(Data &data, const unsigned char *input, unsigned int inputLength) to ignore this returned value.
* @throw logic_error for unimplemented if the derived class does not override.
*/
virtual void decodeData
(Data &data, const unsigned char *input, unsigned int inputLength, unsigned int *signedFieldsBeginOffset, unsigned int *signedFieldsEndOffset);
void decodeData(Data &data, const unsigned char *input, unsigned int inputLength)
{
unsigned int dummyBeginOffset, dummyEndOffset;
decodeData(data, input, inputLength, &dummyBeginOffset, &dummyEndOffset);
}
/**
* Set the static default WireFormat used by default encoding and decoding methods.
* @param wireFormat A Pointer to an object of a subclass of WireFormat. This does not make a copy and
* the caller must ensure that the object remains allocated.
*/
static void setDefaultWireFormat(WireFormat *wireFormat)
{
defaultWireFormat_ = wireFormat;
}
/**
* Return the default WireFormat used by default encoding and decoding methods which was set with
* setDefaultWireFormat.
* @return A pointer to the WireFormat object.
*/
static WireFormat *getDefaultWireFormat();
private:
/**
* This is implemented by only one of the subclasses of WireFormat to return a new object used
* as the initial value for the default WireFormat. If the application doesn't include that class, then the application
* needs to include another subclass which defines WireFormat::newInitialDefaultWireFormat.
* @return a new object, which is held by a shared_ptr and freed when the application exits.
*/
static WireFormat *newInitialDefaultWireFormat();
static WireFormat *defaultWireFormat_;
};
}
#endif