std::size_t read_at(SyncRandomAccessReadDevice& d,
uint64_t offset, const MutableBufferSequence& buffers,
CompletionCondition completion_condition, lslboost::system::error_code& ec)
{
ec = lslboost::system::error_code();
lslboost::asio::detail::consuming_buffers<
mutable_buffer, MutableBufferSequence> tmp(buffers);
std::size_t total_transferred = 0;
tmp.prepare(detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred)));
while (tmp.begin() != tmp.end())
{
std::size_t bytes_transferred = d.read_some_at(
offset + total_transferred, tmp, ec);
tmp.consume(bytes_transferred);
total_transferred += bytes_transferred;
tmp.prepare(detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred)));
}
return total_transferred;
}
std::size_t read_at(SyncRandomAccessReadDevice& d,
uint64_t offset, lslboost::asio::basic_streambuf<Allocator>& b,
CompletionCondition completion_condition, lslboost::system::error_code& ec)
{
ec = lslboost::system::error_code();
std::size_t total_transferred = 0;
std::size_t max_size = detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred));
std::size_t bytes_available = read_size_helper(b, max_size);
while (bytes_available > 0)
{
std::size_t bytes_transferred = d.read_some_at(
offset + total_transferred, b.prepare(bytes_available), ec);
b.commit(bytes_transferred);
total_transferred += bytes_transferred;
max_size = detail::adapt_completion_condition_result(
completion_condition(ec, total_transferred));
bytes_available = read_size_helper(b, max_size);
}
return total_transferred;
}
std::size_t read_at_buffer_sequence(SyncRandomAccessReadDevice& d,
uint64_t offset, const MutableBufferSequence& buffers,
const MutableBufferIterator&, CompletionCondition completion_condition,
asio::error_code& ec)
{
ec = asio::error_code();
asio::detail::consuming_buffers<mutable_buffer,
MutableBufferSequence, MutableBufferIterator> tmp(buffers);
while (!tmp.empty())
{
if (std::size_t max_size = detail::adapt_completion_condition_result(
completion_condition(ec, tmp.total_consumed())))
{
tmp.consume(d.read_some_at(offset + tmp.total_consumed(),
tmp.prepare(max_size), ec));
}
else
break;
}
return tmp.total_consumed();;
}
