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// -*- C++ -*-
//=============================================================================
/**
* @file UIPMC_Message_Block_Data_Iterator.h
*
* $Id$
*
* @author Frank Hunleth <frank@hunleth.com>
*/
//=============================================================================
#ifndef TAO_UIPMC_MESSAGE_BLOCK_DATA_ITERATOR_H
#define TAO_UIPMC_MESSAGE_BLOCK_DATA_ITERATOR_H
#include /**/ "ace/pre.h"
#include "ace/os_include/sys/os_uio.h"
#include "ace/os_include/os_stddef.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/**
* @class UIPMC_Message_Block_Data_Iterator
*
* @brief This is a help class for iterating through ACE_Message_Blocks and to
* segment them into MIOP packets.
*/
class UIPMC_Message_Block_Data_Iterator
{
public:
/// Constructor
UIPMC_Message_Block_Data_Iterator (iovec *iov, int iovcnt);
/// Get the next data block that has a size less than or equal
/// to max_length. Return the length of the block returned.
size_t next_block (size_t max_length,
iovec &block);
private:
enum State
{
INTER_BLOCK,
INTRA_BLOCK
};
iovec *iov_;
int iovcnt_;
// Point internal to a message block, if we have to split one up.
char *iov_ptr_;
int iov_index_;
// Length used in a split message block.
size_t iov_len_left_;
// Current message iterator state.
State state_;
};
#include /**/ "ace/post.h"
#endif /* TAO_UIPMC_MESSAGE_BLOCK_DATA_ITERATOR_H */
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