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Diffstat (limited to 'ext/asio/impl/read_at.ipp')
| -rw-r--r-- | ext/asio/impl/read_at.ipp | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/ext/asio/impl/read_at.ipp b/ext/asio/impl/read_at.ipp new file mode 100644 index 0000000000..7f35750c43 --- /dev/null +++ b/ext/asio/impl/read_at.ipp @@ -0,0 +1,373 @@ +// +// read_at.ipp +// ~~~~~~~~~~~ +// +// Copyright (c) 2003-2010 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 ASIO_READ_AT_IPP +#define ASIO_READ_AT_IPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include "asio/detail/push_options.hpp" + +#include "asio/detail/push_options.hpp" +#include <algorithm> +#include "asio/detail/pop_options.hpp" + +#include "asio/buffer.hpp" +#include "asio/completion_condition.hpp" +#include "asio/error.hpp" +#include "asio/detail/bind_handler.hpp" +#include "asio/detail/consuming_buffers.hpp" +#include "asio/detail/handler_alloc_helpers.hpp" +#include "asio/detail/handler_invoke_helpers.hpp" +#include "asio/detail/throw_error.hpp" + +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, asio::error_code& ec) +{ + ec = asio::error_code(); + 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; +} + +template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence> +inline std::size_t read_at(SyncRandomAccessReadDevice& d, + boost::uint64_t offset, const MutableBufferSequence& buffers) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at( + d, offset, buffers, transfer_all(), ec); + 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) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at( + d, offset, buffers, completion_condition, ec); + asio::detail::throw_error(ec); + return bytes_transferred; +} + +#if !defined(BOOST_NO_IOSTREAM) + +template <typename SyncRandomAccessReadDevice, typename Allocator, + typename CompletionCondition> +std::size_t read_at(SyncRandomAccessReadDevice& d, + boost::uint64_t offset, asio::basic_streambuf<Allocator>& b, + CompletionCondition completion_condition, asio::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, asio::basic_streambuf<Allocator>& b) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at( + d, offset, b, transfer_all(), ec); + 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, asio::basic_streambuf<Allocator>& b, + CompletionCondition completion_condition) +{ + asio::error_code ec; + std::size_t bytes_transferred = read_at( + d, offset, b, completion_condition, ec); + asio::detail::throw_error(ec); + return bytes_transferred; +} + +#endif // !defined(BOOST_NO_IOSTREAM) + +namespace detail +{ + template <typename AsyncRandomAccessReadDevice, + typename MutableBufferSequence, typename CompletionCondition, + typename ReadHandler> + class read_at_handler + { + public: + typedef 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 asio::error_code& ec, + std::size_t bytes_transferred) + { + total_transferred_ += bytes_transferred; + buffers_.consume(bytes_transferred); + buffers_.prepare(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 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) + { + 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) + { + 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) +{ + asio::detail::consuming_buffers< + mutable_buffer, MutableBufferSequence> tmp(buffers); + + asio::error_code ec; + std::size_t total_transferred = 0; + tmp.prepare(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); +} + +#if !defined(BOOST_NO_IOSTREAM) + +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 asio::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_; + 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 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) + { + 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) + { + 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, asio::basic_streambuf<Allocator>& b, + CompletionCondition completion_condition, ReadHandler handler) +{ + asio::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, asio::basic_streambuf<Allocator>& b, + ReadHandler handler) +{ + async_read_at(d, offset, b, transfer_all(), handler); +} + +#endif // !defined(BOOST_NO_IOSTREAM) + +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // ASIO_READ_AT_IPP |