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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/asio/impl/read_at.ipp
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+//
+// read_at.ipp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_READ_AT_IPP
+#define BOOST_ASIO_READ_AT_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <algorithm>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/completion_condition.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/detail/bind_handler.hpp>
+#include <boost/asio/detail/consuming_buffers.hpp>
+#include <boost/asio/detail/handler_alloc_helpers.hpp>
+#include <boost/asio/detail/handler_invoke_helpers.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+
+namespace boost {
+namespace asio {
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition, boost::system::error_code& ec)
+{
+ ec = boost::system::error_code();
+ boost::asio::detail::consuming_buffers<
+ mutable_buffer, MutableBufferSequence> tmp(buffers);
+ std::size_t total_transferred = 0;
+ tmp.set_max_size(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.set_max_size(detail::adapt_completion_condition_result(
+ completion_condition(ec, total_transferred)));
+ }
+ return total_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, buffers, transfer_all(), ec);
+ boost::asio::detail::throw_error(ec);
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, buffers, completion_condition, ec);
+ boost::asio::detail::throw_error(ec);
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition, boost::system::error_code& ec)
+{
+ std::size_t total_transferred = 0;
+ for (;;)
+ {
+ std::size_t bytes_available =
+ std::min<std::size_t>(512, b.max_size() - b.size());
+ 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;
+ if (b.size() == b.max_size()
+ || completion_condition(ec, total_transferred))
+ return total_transferred;
+ }
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, b, transfer_all(), ec);
+ boost::asio::detail::throw_error(ec);
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, b, completion_condition, ec);
+ boost::asio::detail::throw_error(ec);
+ return bytes_transferred;
+}
+
+namespace detail
+{
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ class read_at_handler
+ {
+ public:
+ typedef boost::asio::detail::consuming_buffers<
+ mutable_buffer, MutableBufferSequence> buffers_type;
+
+ read_at_handler(AsyncRandomAccessReadDevice& stream,
+ boost::uint64_t offset, const buffers_type& buffers,
+ CompletionCondition completion_condition, ReadHandler handler)
+ : stream_(stream),
+ offset_(offset),
+ buffers_(buffers),
+ total_transferred_(0),
+ completion_condition_(completion_condition),
+ handler_(handler)
+ {
+ }
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred)
+ {
+ total_transferred_ += bytes_transferred;
+ buffers_.consume(bytes_transferred);
+ buffers_.set_max_size(detail::adapt_completion_condition_result(
+ completion_condition_(ec, total_transferred_)));
+ if (buffers_.begin() == buffers_.end())
+ {
+ handler_(ec, total_transferred_);
+ }
+ else
+ {
+ stream_.async_read_some_at(
+ offset_ + total_transferred_, buffers_, *this);
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& stream_;
+ boost::uint64_t offset_;
+ buffers_type buffers_;
+ std::size_t total_transferred_;
+ CompletionCondition completion_condition_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void* asio_handler_allocate(std::size_t size,
+ read_at_handler<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ return boost_asio_handler_alloc_helpers::allocate(
+ size, &this_handler->handler_);
+ }
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void asio_handler_deallocate(void* pointer, std::size_t size,
+ read_at_handler<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_alloc_helpers::deallocate(
+ pointer, size, &this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void asio_handler_invoke(const Function& function,
+ read_at_handler<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_invoke_helpers::invoke(
+ function, &this_handler->handler_);
+ }
+} // namespace detail
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition, typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition, ReadHandler handler)
+{
+ boost::asio::detail::consuming_buffers<
+ mutable_buffer, MutableBufferSequence> tmp(buffers);
+
+ boost::system::error_code ec;
+ std::size_t total_transferred = 0;
+ tmp.set_max_size(detail::adapt_completion_condition_result(
+ completion_condition(ec, total_transferred)));
+ if (tmp.begin() == tmp.end())
+ {
+ d.get_io_service().post(detail::bind_handler(
+ handler, ec, total_transferred));
+ return;
+ }
+
+ d.async_read_some_at(offset, tmp,
+ detail::read_at_handler<AsyncRandomAccessReadDevice,
+ MutableBufferSequence, CompletionCondition, ReadHandler>(
+ d, offset, tmp, completion_condition, handler));
+}
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ ReadHandler handler)
+{
+ async_read_at(d, offset, buffers, transfer_all(), handler);
+}
+
+namespace detail
+{
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_streambuf_handler
+ {
+ public:
+ read_at_streambuf_handler(AsyncRandomAccessReadDevice& stream,
+ boost::uint64_t offset, basic_streambuf<Allocator>& streambuf,
+ CompletionCondition completion_condition, ReadHandler handler)
+ : stream_(stream),
+ offset_(offset),
+ streambuf_(streambuf),
+ total_transferred_(0),
+ completion_condition_(completion_condition),
+ handler_(handler)
+ {
+ }
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred)
+ {
+ total_transferred_ += bytes_transferred;
+ streambuf_.commit(bytes_transferred);
+ std::size_t max_size = detail::adapt_completion_condition_result(
+ completion_condition_(ec, total_transferred_));
+ std::size_t bytes_available = std::min<std::size_t>(512,
+ std::min<std::size_t>(max_size,
+ streambuf_.max_size() - streambuf_.size()));
+ if (bytes_available == 0)
+ {
+ handler_(ec, total_transferred_);
+ }
+ else
+ {
+ stream_.async_read_some_at(offset_ + total_transferred_,
+ streambuf_.prepare(bytes_available), *this);
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& stream_;
+ boost::uint64_t offset_;
+ boost::asio::basic_streambuf<Allocator>& streambuf_;
+ std::size_t total_transferred_;
+ CompletionCondition completion_condition_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline void* asio_handler_allocate(std::size_t size,
+ read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ return boost_asio_handler_alloc_helpers::allocate(
+ size, &this_handler->handler_);
+ }
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline void asio_handler_deallocate(void* pointer, std::size_t size,
+ read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_alloc_helpers::deallocate(
+ pointer, size, &this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename Allocator, typename CompletionCondition, typename ReadHandler>
+ inline void asio_handler_invoke(const Function& function,
+ read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_invoke_helpers::invoke(
+ function, &this_handler->handler_);
+ }
+} // namespace detail
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition, ReadHandler handler)
+{
+ boost::system::error_code ec;
+ 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 = std::min<std::size_t>(512,
+ std::min<std::size_t>(max_size, b.max_size() - b.size()));
+ if (bytes_available == 0)
+ {
+ d.get_io_service().post(detail::bind_handler(
+ handler, ec, total_transferred));
+ return;
+ }
+
+ d.async_read_some_at(offset, b.prepare(bytes_available),
+ detail::read_at_streambuf_handler<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>(
+ d, offset, b, completion_condition, handler));
+}
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ ReadHandler handler)
+{
+ async_read_at(d, offset, b, transfer_all(), handler);
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_READ_AT_IPP