comparison DEPENDENCIES/generic/include/boost/iostreams/copy.hpp @ 16:2665513ce2d3

Add boost headers

+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// 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.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+// Contains: The function template copy, which reads data from a Source 
+// and writes it to a Sink until the end of the sequence is reached, returning 
+// the number of characters transfered.
+
+// The implementation is complicated by the need to handle smart adapters
+// and direct devices.
+
+#ifndef BOOST_IOSTREAMS_COPY_HPP_INCLUDED
+#define BOOST_IOSTREAMS_COPY_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif              
+
+#include <boost/config.hpp>                 // Make sure ptrdiff_t is in std.
+#include <algorithm>                        // copy, min.
+#include <cstddef>                          // ptrdiff_t.
+#include <utility>                          // pair.
+#include <boost/bind.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/iostreams/chain.hpp>
+#include <boost/iostreams/constants.hpp>
+#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>        
+#include <boost/iostreams/detail/buffer.hpp>
+#include <boost/iostreams/detail/enable_if_stream.hpp>  
+#include <boost/iostreams/detail/execute.hpp>
+#include <boost/iostreams/detail/functional.hpp>
+#include <boost/iostreams/detail/ios.hpp>   // failure, streamsize.                   
+#include <boost/iostreams/detail/resolve.hpp>                   
+#include <boost/iostreams/detail/wrap_unwrap.hpp>
+#include <boost/iostreams/operations.hpp>  // read, write, close.
+#include <boost/iostreams/pipeline.hpp>
+#include <boost/static_assert.hpp>  
+#include <boost/type_traits/is_same.hpp> 
+
+namespace boost { namespace iostreams {
+
+namespace detail {
+
+    // The following four overloads of copy_impl() optimize 
+    // copying in the case that one or both of the two devices
+    // models Direct (see 
+    // http://www.boost.org/libs/iostreams/doc/index.html?path=4.1.1.4)
+
+// Copy from a direct source to a direct sink
+template<typename Source, typename Sink>
+std::streamsize copy_impl( Source& src, Sink& snk, 
+                           std::streamsize /* buffer_size */,
+                           mpl::true_, mpl::true_ )
+{   
+    using namespace std;
+    typedef typename char_type_of<Source>::type  char_type;
+    typedef std::pair<char_type*, char_type*>    pair_type;
+    pair_type p1 = iostreams::input_sequence(src);
+    pair_type p2 = iostreams::output_sequence(snk);
+    std::streamsize total = 
+        static_cast<std::streamsize>(
+            (std::min)(p1.second - p1.first, p2.second - p2.first)
+        );
+    std::copy(p1.first, p1.first + total, p2.first);
+    return total;
+}
+
+// Copy from a direct source to an indirect sink
+template<typename Source, typename Sink>
+std::streamsize copy_impl( Source& src, Sink& snk, 
+                           std::streamsize /* buffer_size */,
+                           mpl::true_, mpl::false_ )
+{
+    using namespace std;
+    typedef typename char_type_of<Source>::type  char_type;
+    typedef std::pair<char_type*, char_type*>    pair_type;
+    pair_type p = iostreams::input_sequence(src);
+    std::streamsize size, total;
+    for ( total = 0, size = static_cast<std::streamsize>(p.second - p.first);
+          total < size; )
+    {
+        std::streamsize amt = 
+            iostreams::write(snk, p.first + total, size - total); 
+        total += amt;
+    }
+    return total;
+}
+
+// Copy from an indirect source to a direct sink
+template<typename Source, typename Sink>
+std::streamsize copy_impl( Source& src, Sink& snk, 
+                           std::streamsize buffer_size,
+                           mpl::false_, mpl::true_ )
+{
+    typedef typename char_type_of<Source>::type  char_type;
+    typedef std::pair<char_type*, char_type*>    pair_type;
+    detail::basic_buffer<char_type>  buf(buffer_size);
+    pair_type                        p = snk.output_sequence();
+    std::streamsize                  total = 0;
+    std::ptrdiff_t                   capacity = p.second - p.first;
+    while (true) {
+        std::streamsize amt = 
+            iostreams::read(
+                src, 
+                buf.data(),
+                buffer_size < capacity - total ?
+                    buffer_size :
+                    static_cast<std::streamsize>(capacity - total)
+            );
+        if (amt == -1)
+            break;
+        std::copy(buf.data(), buf.data() + amt, p.first + total);
+        total += amt;
+    }
+    return total;
+}
+
+// Copy from an indirect source to an indirect sink
+template<typename Source, typename Sink>
+std::streamsize copy_impl( Source& src, Sink& snk, 
+                           std::streamsize buffer_size,
+                           mpl::false_, mpl::false_ )
+{ 
+    typedef typename char_type_of<Source>::type char_type;
+    detail::basic_buffer<char_type>  buf(buffer_size);
+    non_blocking_adapter<Sink>       nb(snk);
+    std::streamsize                  total = 0;
+    bool                             done = false;
+    while (!done) {
+        std::streamsize amt;
+        done = (amt = iostreams::read(src, buf.data(), buffer_size)) == -1;
+        if (amt != -1) {
+            iostreams::write(nb, buf.data(), amt);
+            total += amt;
+        }
+    }
+    return total;
+}
+
+    // The following function object is used with 
+    // boost::iostreams::detail::execute() in the primary 
+    // overload of copy_impl(), below
+
+// Function object that delegates to one of the above four 
+// overloads of compl_impl()
+template<typename Source, typename Sink>
+class copy_operation {
+public:
+    typedef std::streamsize result_type;
+    copy_operation(Source& src, Sink& snk, std::streamsize buffer_size)
+        : src_(src), snk_(snk), buffer_size_(buffer_size)
+        { }
+    std::streamsize operator()() 
+    {
+        return copy_impl( src_, snk_, buffer_size_, 
+                          is_direct<Source>(), is_direct<Sink>() );
+    }
+private:
+    copy_operation& operator=(const copy_operation&);
+    Source&          src_;
+    Sink&            snk_;
+    std::streamsize  buffer_size_;
+};
+
+// Primary overload of copy_impl. Delegates to one of the above four 
+// overloads of compl_impl(), depending on which of the two given 
+// devices, if any, models Direct (see 
+// http://www.boost.org/libs/iostreams/doc/index.html?path=4.1.1.4)
+template<typename Source, typename Sink>
+std::streamsize copy_impl(Source src, Sink snk, std::streamsize buffer_size)
+{
+    using namespace std;
+    typedef typename char_type_of<Source>::type  src_char;
+    typedef typename char_type_of<Sink>::type    snk_char;
+    BOOST_STATIC_ASSERT((is_same<src_char, snk_char>::value));
+    return detail::execute_all(
+               copy_operation<Source, Sink>(src, snk, buffer_size),
+               detail::call_close_all(src),
+               detail::call_close_all(snk)
+           );
+}
+
+} // End namespace detail.
+                    
+//------------------Definition of copy----------------------------------------//
+
+// Overload of copy() for the case where neither the source nor the sink is
+// a standard stream or stream buffer
+template<typename Source, typename Sink>
+std::streamsize
+copy( const Source& src, const Sink& snk,
+      std::streamsize buffer_size = default_device_buffer_size
+      BOOST_IOSTREAMS_DISABLE_IF_STREAM(Source)
+      BOOST_IOSTREAMS_DISABLE_IF_STREAM(Sink) )
+{ 
+    typedef typename char_type_of<Source>::type char_type;
+    return detail::copy_impl( detail::resolve<input, char_type>(src), 
+                              detail::resolve<output, char_type>(snk), 
+                              buffer_size ); 
+}
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) //---------------------------------//
+
+// Overload of copy() for the case where the source, but not the sink, is
+// a standard stream or stream buffer
+template<typename Source, typename Sink>
+std::streamsize
+copy( Source& src, const Sink& snk,
+      std::streamsize buffer_size = default_device_buffer_size
+      BOOST_IOSTREAMS_ENABLE_IF_STREAM(Source)
+      BOOST_IOSTREAMS_DISABLE_IF_STREAM(Sink) ) 
+{ 
+    typedef typename char_type_of<Source>::type char_type;
+    return detail::copy_impl( detail::wrap(src), 
+                              detail::resolve<output, char_type>(snk), 
+                              buffer_size );
+}
+
+// Overload of copy() for the case where the sink, but not the source, is
+// a standard stream or stream buffer
+template<typename Source, typename Sink>
+std::streamsize
+copy( const Source& src, Sink& snk,
+      std::streamsize buffer_size = default_device_buffer_size
+      BOOST_IOSTREAMS_DISABLE_IF_STREAM(Source)
+      BOOST_IOSTREAMS_ENABLE_IF_STREAM(Sink) ) 
+{ 
+    typedef typename char_type_of<Source>::type char_type;
+    return detail::copy_impl( detail::resolve<input, char_type>(src), 
+                              detail::wrap(snk), buffer_size );
+}
+
+// Overload of copy() for the case where neither the source nor the sink is
+// a standard stream or stream buffer
+template<typename Source, typename Sink>
+std::streamsize
+copy( Source& src, Sink& snk,
+      std::streamsize buffer_size = default_device_buffer_size
+      BOOST_IOSTREAMS_ENABLE_IF_STREAM(Source)
+      BOOST_IOSTREAMS_ENABLE_IF_STREAM(Sink) ) 
+{ 
+    return detail::copy_impl(detail::wrap(src), detail::wrap(snk), buffer_size);
+}
+
+#endif // #if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) //-----------------------//
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef BOOST_IOSTREAMS_COPY_HPP_INCLUDED