lib/cpp/src/protocol/TBinaryProtocol.h

// Copyright (c) 2006- Facebook
// Distributed under the Thrift Software License
//
// See accompanying file LICENSE or visit the Thrift site at:
// http://developers.facebook.com/thrift/

#ifndef _THRIFT_PROTOCOL_TBINARYPROTOCOL_H_
#define _THRIFT_PROTOCOL_TBINARYPROTOCOL_H_ 1

#include "TProtocol.h"

#include <boost/shared_ptr.hpp>

namespace facebook { namespace thrift { namespace protocol { 

using namespace boost;

/**
 * The default binary protocol for thrift. Writes all data in a very basic
 * binary format, essentially just spitting out the raw bytes.
 *
 * @author Mark Slee <mcslee@facebook.com>
 */
class TBinaryProtocol : public TProtocol {
 public:
  TBinaryProtocol(shared_ptr<TTransport> trans) :
    TProtocol(trans),
    string_limit_(0),
    container_limit_(0),
    string_buf_(NULL),
    string_buf_size_(0) {}

  TBinaryProtocol(shared_ptr<TTransport> trans,
                  int32_t string_limit,
                  int32_t container_limit) :
    TProtocol(trans),
    string_limit_(string_limit),
    container_limit_(container_limit),
    string_buf_(NULL),
    string_buf_size_(0) {}

  ~TBinaryProtocol() {
    if (string_buf_ != NULL) {
      free(string_buf_);
      string_buf_size_ = 0;
    }
  }

  void setStringSizeLimit(int32_t string_limit) {
    string_limit_ = string_limit;
  }

  void setContainerSizeLimit(int32_t container_limit) {
    container_limit_ = container_limit;
  }

  /**
   * Writing functions.
   */

  virtual uint32_t writeMessageBegin(const std::string name,
				     const TMessageType messageType,
				     const int32_t seqid);

  virtual uint32_t writeMessageEnd();


  uint32_t writeStructBegin(const std::string& name);

  uint32_t writeStructEnd();

  uint32_t writeFieldBegin(const std::string& name,
                           const TType fieldType,
                           const int16_t fieldId);

  uint32_t writeFieldEnd();

  uint32_t writeFieldStop();
                                       
  uint32_t writeMapBegin(const TType keyType,
                         const TType valType,
                         const uint32_t size);

  uint32_t writeMapEnd();

  uint32_t writeListBegin(const TType elemType,
                          const uint32_t size);

  uint32_t writeListEnd();

  uint32_t writeSetBegin(const TType elemType,
                         const uint32_t size);

  uint32_t writeSetEnd();

  uint32_t writeBool(const bool value);

  uint32_t writeByte(const int8_t byte);

  uint32_t writeI16(const int16_t i16);

  uint32_t writeI32(const int32_t i32);

  uint32_t writeI64(const int64_t i64);

  uint32_t writeDouble(const double dub);


  uint32_t writeString(const std::string& str);

  /**
   * Reading functions
   */


  uint32_t readMessageBegin(std::string& name,
			    TMessageType& messageType,
			    int32_t& seqid);

  uint32_t readMessageEnd();

  uint32_t readStructBegin(std::string& name);

  uint32_t readStructEnd();

  uint32_t readFieldBegin(std::string& name,
			  TType& fieldType,
			  int16_t& fieldId);
  
  uint32_t readFieldEnd();
 
  uint32_t readMapBegin(TType& keyType,
			TType& valType,
			uint32_t& size);

  uint32_t readMapEnd();

  uint32_t readListBegin(TType& elemType,
                         uint32_t& size);
  
  uint32_t readListEnd();

  uint32_t readSetBegin(TType& elemType,
			uint32_t& size);

  uint32_t readSetEnd();

  uint32_t readBool(bool& value);

  uint32_t readByte(int8_t& byte);

  uint32_t readI16(int16_t& i16);

  uint32_t readI32(int32_t& i32);

  uint32_t readI64(int64_t& i64);

  uint32_t readDouble(double& dub);

  uint32_t readString(std::string& str);

 private:
  int32_t string_limit_;
  int32_t container_limit_;

  // Buffer for reading strings, save for the lifetime of the protocol to
  // avoid memory churn allocating memory on every string read
  uint8_t* string_buf_;
  int32_t string_buf_size_;

};

/**
 * Constructs binary protocol handlers
 */
class TBinaryProtocolFactory : public TProtocolFactory {
 public:
  TBinaryProtocolFactory() :
    string_limit_(0),
    container_limit_(0) {}

  TBinaryProtocolFactory(int32_t string_limit, int32_t container_limit) :
    string_limit_(string_limit),
    container_limit_(container_limit) {}

  virtual ~TBinaryProtocolFactory() {}

  void setStringSizeLimit(int32_t string_limit) {
    string_limit_ = string_limit;
  }

  void setContainerSizeLimit(int32_t container_limit) {
    container_limit_ = container_limit;
  }

  boost::shared_ptr<TProtocol> getProtocol(boost::shared_ptr<TTransport> trans) {
    return boost::shared_ptr<TProtocol>(new TBinaryProtocol(trans, string_limit_, container_limit_));
  }

 private:
  int32_t string_limit_;
  int32_t container_limit_;

};

}}} // facebook::thrift::protocol

#endif // #ifndef _THRIFT_PROTOCOL_TBINARYPROTOCOL_H_