void send(const ConstBufferSequence& buffers) {
for (auto i = buffers.begin(); i != buffers.end(); ++i) {
size_t buf_size = asio::buffer_size(*i);
size_t new_size = buf_size + data_size;
unsigned char* buf = const_cast<unsigned char*>(asio::buffer_cast<const unsigned char*>(*i));
unsigned char* new_data = new unsigned char[new_size];
memcpy(new_data, data, data_size);
memcpy(new_data+data_size, buf, buf_size);
delete[] data;
data = new_data;
data_size = new_size;
}
}
typename std::enable_if<
is_const_buffer_sequence<ConstBufferSequence>::value,
std::size_t>::type
size_rev_post(ConstBufferSequence const& buffers)
{
std::size_t n = 0;
for(auto it = buffers.end(); it != buffers.begin();)
{
it--;
n += boost::asio::buffer_size(*it);
}
return n;
}
std::size_t write_some(ConstBufferSequence& buf
, boost::system::error_code& ec)
{
ec = boost::system::error_code();
std::size_t bytes_transferred(0);
for(typename ConstBufferSequence::const_iterator i = buf.begin(),
end (buf.end())
; !ec && i != end; ++i)
{
std::size_t buf_len = boost::asio::buffer_size(*i);
bytes_transferred += write_some(boost::asio::buffer_cast<const char *>(*i), buf_len, ec);
}
return bytes_transferred;
}
typename std::enable_if<
is_const_buffer_sequence<ConstBufferSequence>::value,
std::size_t>::type
size_pre(ConstBufferSequence const& buffers)
{
std::size_t n = 0;
for(auto it = buffers.begin(); it != buffers.end(); ++it)
{
typename ConstBufferSequence::const_iterator it0(std::move(it));
typename ConstBufferSequence::const_iterator it1(it0);
typename ConstBufferSequence::const_iterator it2;
it2 = it1;
n += boost::asio::buffer_size(*it2);
it = std::move(it2);
}
return n;
}
void
operator()(error_code& ec, ConstBufferSequence const& buffers) const
{
// These asio functions are needed to access a buffer's contents
using boost::asio::buffer_cast;
using boost::asio::buffer_size;
// Error codes must be cleared on success
ec = {};
// Keep a running total of how much we wrote
std::size_t bytes_transferred = 0;
// Loop over the buffer sequence
for(auto it = buffers.begin(); it != buffers.end(); ++ it)
{
// This is the next buffer in the sequence
boost::asio::const_buffer const buffer = *it;
// Write it to the std::ostream
os_.write(
buffer_cast<char const*>(buffer),
buffer_size(buffer));
// If the std::ostream fails, convert it to an error code
if(os_.fail())
{
ec = make_error_code(errc::io_error);
return;
}
// Adjust our running total
bytes_transferred += buffer_size(buffer);
}
// Inform the serializer of the amount we consumed
sr_.consume(bytes_transferred);
}
// Create an iterator for the specified position.
const_buffers_iterator(const ConstBufferSequence& buffers,
std::size_t position)
: begin_(buffers.begin()),
current_(buffers.begin()),
end_(buffers.end()),
position_(0)
{
while (current_ != end_)
{
current_buffer_ = *current_;
std::size_t buffer_size = boost::asio::buffer_size(current_buffer_);
if (position - position_ < buffer_size)
{
current_buffer_position_ = position - position_;
position_ = position;
return;
}
position_ += buffer_size;
++current_;
}
current_buffer_ = boost::asio::const_buffer();
current_buffer_position_ = 0;
}
void async_write_some_at(implementation_type& impl, boost::uint64_t offset,
const ConstBufferSequence& buffers, Handler handler)
{
if (!is_open(impl))
{
this->get_io_service().post(bind_handler(handler,
boost::asio::error::bad_descriptor, 0));
return;
}
// Update the ID of the thread from which cancellation is safe.
if (impl.safe_cancellation_thread_id_ == 0)
impl.safe_cancellation_thread_id_ = ::GetCurrentThreadId();
else if (impl.safe_cancellation_thread_id_ != ::GetCurrentThreadId())
impl.safe_cancellation_thread_id_ = ~DWORD(0);
// Allocate and construct an operation to wrap the handler.
typedef write_operation<ConstBufferSequence, Handler> value_type;
typedef handler_alloc_traits<Handler, value_type> alloc_traits;
raw_handler_ptr<alloc_traits> raw_ptr(handler);
handler_ptr<alloc_traits> ptr(raw_ptr, iocp_service_, buffers, handler);
// Find first buffer of non-zero length.
boost::asio::const_buffer buffer;
typename ConstBufferSequence::const_iterator iter = buffers.begin();
typename ConstBufferSequence::const_iterator end = buffers.end();
for (DWORD i = 0; iter != end; ++iter, ++i)
{
buffer = boost::asio::const_buffer(*iter);
if (boost::asio::buffer_size(buffer) != 0)
break;
}
// A request to write 0 bytes on a handle is a no-op.
if (boost::asio::buffer_size(buffer) == 0)
{
boost::asio::io_service::work work(this->get_io_service());
ptr.reset();
boost::system::error_code error;
iocp_service_.post(bind_handler(handler, error, 0));
return;
}
// Write the data.
DWORD bytes_transferred = 0;
ptr.get()->Offset = offset & 0xFFFFFFFF;
ptr.get()->OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
BOOL ok = ::WriteFile(impl.handle_,
boost::asio::buffer_cast<LPCVOID>(buffer),
static_cast<DWORD>(boost::asio::buffer_size(buffer)),
&bytes_transferred, ptr.get());
DWORD last_error = ::GetLastError();
// Check if the operation completed immediately.
if (!ok && last_error != ERROR_IO_PENDING)
{
boost::asio::io_service::work work(this->get_io_service());
ptr.reset();
boost::system::error_code ec(last_error,
boost::asio::error::get_system_category());
iocp_service_.post(bind_handler(handler, ec, bytes_transferred));
}
else
{
ptr.release();
}
}
size_t write_some_at(implementation_type& impl, boost::uint64_t offset,
const ConstBufferSequence& buffers, boost::system::error_code& ec)
{
if (!is_open(impl))
{
ec = boost::asio::error::bad_descriptor;
return 0;
}
// Find first buffer of non-zero length.
boost::asio::const_buffer buffer;
typename ConstBufferSequence::const_iterator iter = buffers.begin();
typename ConstBufferSequence::const_iterator end = buffers.end();
for (DWORD i = 0; iter != end; ++iter, ++i)
{
buffer = boost::asio::const_buffer(*iter);
if (boost::asio::buffer_size(buffer) != 0)
break;
}
// A request to write 0 bytes on a handle is a no-op.
if (boost::asio::buffer_size(buffer) == 0)
{
ec = boost::system::error_code();
return 0;
}
overlapped_wrapper overlapped(ec);
if (ec)
{
return 0;
}
// Write the data.
overlapped.Offset = offset & 0xFFFFFFFF;
overlapped.OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
BOOL ok = ::WriteFile(impl.handle_,
boost::asio::buffer_cast<LPCVOID>(buffer),
static_cast<DWORD>(boost::asio::buffer_size(buffer)), 0, &overlapped);
if (!ok)
{
DWORD last_error = ::GetLastError();
if (last_error != ERROR_IO_PENDING)
{
ec = boost::system::error_code(last_error,
boost::asio::error::get_system_category());
return 0;
}
}
// Wait for the operation to complete.
DWORD bytes_transferred = 0;
ok = ::GetOverlappedResult(impl.handle_,
&overlapped, &bytes_transferred, TRUE);
if (!ok)
{
DWORD last_error = ::GetLastError();
ec = boost::system::error_code(last_error,
boost::asio::error::get_system_category());
}
ec = boost::system::error_code();
return bytes_transferred;
}
