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// -*- C++ -*-
//=============================================================================
/**
* @file GIOP_Message_State.h
*
* $Id$
*
* GIOP utility definitions
*
*
* @author Chris Cleeland <cleeland@cs.wustl.edu>
* @author Carlos O' Ryan <coryan@uci.edu>
* @author Balachandran Natarajan <bala@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_GIOP_MESSAGE_STATE_H
#define TAO_GIOP_MESSAGE_STATE_H
#include /**/ "ace/pre.h"
#include "tao/GIOP_Message_Version.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
class TAO_ORB_Core;
class TAO_GIOP_Message_Base;
/**
* @class TAO_GIOP_Message_State
*
* @brief Generic definitions for Message States.
*
* This helps to establish the state of the incoming messages.
*/
class TAO_Export TAO_GIOP_Message_State
{
public:
/// Ctor
TAO_GIOP_Message_State (void);
/// Parse the message header.
///
/// \return -1 There was some error parsing the GIOP header
/// \return 0 The GIOP header was parsed correctly
/// \return 1 There was not enough data in the message block to
/// parse the header
int parse_message_header (ACE_Message_Block &incoming);
/// Return the message size
CORBA::ULong message_size (void) const;
/// Return the message size
CORBA::ULong payload_size (void) const;
/// Return the byte order information
CORBA::Octet byte_order (void) const;
/// Reset the state..
void reset (void);
private:
friend class TAO_GIOP_Message_Base;
/// Parse the message header.
int parse_message_header_i (ACE_Message_Block &incoming);
/// Checks for the magic word 'GIOP' in the start of the incoing
/// stream
int parse_magic_bytes (char *buf);
/// Extracts the version information from the incoming
/// stream. Performs a check for whether the version information is
/// right and sets the information in the <state>
int get_version_info (char *buf);
/// Extracts the byte order information from the incoming
/// stream. Performs a check for whether the byte order information
/// right and sets the information in the <state>
int get_byte_order_info (char *buf);
/// Gets the size of the payload and set the size in the <state>
void get_payload_size (char *buf);
/// Read the unsigned long from the buffer. The <buf> should just
/// point to the next 4 bytes data that represent the ULong
CORBA::ULong read_ulong (const char *buf) const;
private:
// GIOP version information..
TAO_GIOP_Message_Version giop_version_;
/// 0 = big, 1 = little
CORBA::Octet byte_order_;
/// MsgType above
CORBA::Octet message_type_;
/// in byte_order!
CORBA::ULong message_size_;
/// (Requests and Replys)
/// A value of zero indicates that this message does not have any
/// fragments. A value of non-zero indicates that it does have
/// fragments.
CORBA::Octet more_fragments_;
/// Missing data
CORBA::ULong missing_data_;
};
TAO_END_VERSIONED_NAMESPACE_DECL
static const size_t TAO_GIOP_MESSAGE_HEADER_LEN = 12;
static const size_t TAO_GIOP_MESSAGE_SIZE_OFFSET = 8;
static const size_t TAO_GIOP_MESSAGE_FLAGS_OFFSET = 6;
static const size_t TAO_GIOP_MESSAGE_TYPE_OFFSET = 7;
static const size_t TAO_GIOP_VERSION_MINOR_OFFSET = 5;
static const size_t TAO_GIOP_VERSION_MAJOR_OFFSET = 4;
static const size_t TAO_GIOP_MESSAGE_FRAGMENT_HEADER = 4;
#if defined (__ACE_INLINE__)
# include "tao/GIOP_Message_State.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /*TAO_GIOP_MESSAGE_STATE_H*/
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