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#include "orbsvcs/PortableGroup/UIPMC_Message_Block_Data_Iterator.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
UIPMC_Message_Block_Data_Iterator::UIPMC_Message_Block_Data_Iterator (iovec *iov, int iovcnt) :
iov_ (iov),
iovcnt_ (iovcnt),
iov_index_ (0),
iov_ptr_ (0),
iov_len_left_ (0),
state_ (INTER_BLOCK)
{
}
bool
UIPMC_Message_Block_Data_Iterator::next_block (size_t max_length,
iovec &block)
{
if (this->state_ == INTER_BLOCK)
{
// Check that there are some iovec buffers left.
if (this->iov_index_ >= this->iovcnt_)
return false;
if (static_cast<u_long> (this->iov_[this->iov_index_].iov_len) <= max_length)
{
// Return the full data portion.
block.iov_len = this->iov_[this->iov_index_].iov_len;
block.iov_base = this->iov_[this->iov_index_].iov_base;
// Go to the next block.
++this->iov_index_;
return true;
}
else
{
// Let the caller use the first part of this
// message block.
block.iov_len = max_length;
block.iov_base = this->iov_[this->iov_index_].iov_base;
// Break up the block.
this->iov_len_left_ =
this->iov_[this->iov_index_].iov_len - max_length;
this->iov_ptr_ =
reinterpret_cast<char *> (block.iov_base) + max_length;
this->state_ = INTRA_BLOCK;
return true;
}
}
else
{
// Currently scanning a split block.
if (this->iov_len_left_ <= max_length)
{
// Return everything that's left in the block.
block.iov_len = this->iov_len_left_;
block.iov_base = this->iov_ptr_;
// Go to the next block.
++this->iov_index_;
// Update the state.
this->state_ = INTER_BLOCK;
return true;
}
else
{
// Split a little more off the block.
block.iov_len = max_length;
block.iov_base = this->iov_ptr_;
this->iov_len_left_ -= max_length;
this->iov_ptr_ += max_length;
return true;
}
}
}
TAO_END_VERSIONED_NAMESPACE_DECL
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