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  1. // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
  2. // (C) Copyright 2005-2007 Jonathan Turkanis
  3. // Distributed under the Boost Software License, Version 1.0. (See accompanying
  4. // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
  5.  
  6. // See http://www.boost.org/libs/iostreams for documentation.
  7.  
  8. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace iostreams {
  9.  
  10. namespace detail {
  11.  
  12. template<typename T>
  13. struct read_device_impl;
  14.  
  15. template<typename T>
  16. struct read_filter_impl;
  17.  
  18. } // End namespace detail.
  19.  
  20. template<typename T>
  21. typename int_type_of<T>::type get(T& t)
  22. {
  23.     typedef typename detail::unwrapped_type<T>::type unwrapped;
  24.     return detail::read_device_impl<T>::inner<unwrapped>::get(detail::unwrap(t));
  25. }
  26.  
  27. template<typename T>
  28. inline std::streamsize
  29. read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
  30. {
  31.     typedef typename detail::unwrapped_type<T>::type unwrapped;
  32.     return detail::read_device_impl<T>::inner<unwrapped>::read(detail::unwrap(t), s, n);
  33. }
  34.  
  35. template<typename T, typename Source>
  36. std::streamsize
  37. read(T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n)
  38. {
  39.     typedef typename detail::unwrapped_type<T>::type unwrapped;
  40.     return detail::read_filter_impl<T>::inner<unwrapped>::read(detail::unwrap(t), src, s, n);
  41. }
  42.  
  43. template<typename T>
  44. bool putback(T& t, typename char_type_of<T>::type c)
  45. {
  46.     typedef typename detail::unwrapped_type<T>::type unwrapped;
  47.     return detail::read_device_impl<T>::inner<unwrapped>::putback(detail::unwrap(t), c);
  48. }
  49.  
  50. //----------------------------------------------------------------------------//
  51.  
  52. namespace detail {
  53.  
  54. // Helper function for adding -1 as EOF indicator.
  55. inline std::streamsize check_eof(std::streamsize n) { return n != 0 ? n : -1; }
  56.  
  57. // Helper templates for reading from streambufs.
  58. template<bool IsLinked>
  59. struct true_eof_impl;
  60.  
  61. template<>
  62. struct true_eof_impl<true> {
  63.     template<typename T>
  64.     static bool true_eof(T& t) { return t.true_eof(); }
  65. };
  66.  
  67. template<>
  68. struct true_eof_impl<false> {
  69.     template<typename T>
  70.     static bool true_eof(T& t) { return true; }
  71. };
  72.  
  73. template<typename T>
  74. inline bool true_eof(T& t)
  75. {
  76.     const bool linked = is_linked<T>::value;
  77.     return true_eof_impl<linked>::true_eof(t);
  78. }
  79.                    
  80. //------------------Definition of read_device_impl----------------------------//
  81.  
  82. template<typename T>
  83. struct read_device_impl
  84.     : mpl::if_<
  85.           detail::is_custom<T>,
  86.           operations<T>,
  87.           read_device_impl<
  88.               BOOST_DEDUCED_TYPENAME
  89.               detail::dispatch<
  90.                   T, istream_tag, streambuf_tag, input
  91.               >::type
  92.           >
  93.       >::type
  94.     { };
  95.  
  96. template<>
  97. struct read_device_impl<istream_tag> {
  98.     template<typename T>
  99.     struct inner {
  100.         static typename int_type_of<T>::type get(T& t)
  101.         { return t.get(); }
  102.  
  103.         static std::streamsize
  104.         read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
  105.         { return check_eof(t.rdbuf()->sgetn(s, n)); }
  106.  
  107.         static bool putback(T& t, typename char_type_of<T>::type c)
  108.         {
  109.             typedef typename char_type_of<T>::type          char_type;
  110.             typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type)  traits_type;
  111.             return !traits_type::eq_int_type( t.rdbuf()->sputbackc(c),
  112.                                               traits_type::eof() );
  113.         }
  114.     };
  115. };
  116.  
  117. template<>
  118. struct read_device_impl<streambuf_tag> {
  119.     template<typename T>
  120.     struct inner {
  121.         static typename int_type_of<T>::type
  122.         get(T& t)
  123.         {
  124.             typedef typename char_type_of<T>::type  char_type;
  125.             typedef char_traits<char_type>          traits_type;
  126.             typename int_type_of<T>::type c;
  127.             return !traits_type::is_eof(c = t.sbumpc()) ||
  128.                     detail::true_eof(t)
  129.                         ?
  130.                     c : traits_type::would_block();
  131.         }
  132.  
  133.         static std::streamsize
  134.         read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
  135.         {
  136.             std::streamsize amt;
  137.             return (amt = t.sgetn(s, n)) != 0 ?
  138.                 amt :
  139.                 detail::true_eof(t) ?
  140.                     -1 :
  141.                     0;
  142.         }
  143.  
  144.         static bool putback(T& t, typename char_type_of<T>::type c)
  145.         {
  146.             typedef typename char_type_of<T>::type  char_type;
  147.             typedef char_traits<char_type>          traits_type;
  148.             return !traits_type::is_eof(t.sputbackc(c));
  149.         }
  150.     };
  151. };
  152.  
  153. template<>
  154. struct read_device_impl<input> {
  155.     template<typename T>
  156.     struct inner {
  157.         static typename int_type_of<T>::type
  158.         get(T& t)
  159.         {
  160.             typedef typename char_type_of<T>::type  char_type;
  161.             typedef char_traits<char_type>          traits_type;
  162.             char_type c;
  163.             std::streamsize amt;
  164.             return (amt = t.read(&c, 1)) == 1 ?
  165.                 traits_type::to_int_type(c) :
  166.                 amt == -1 ?
  167.                     traits_type::eof() :
  168.                     traits_type::would_block();
  169.         }
  170.  
  171.         template<typename T>
  172.         static std::streamsize
  173.         read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
  174.         { return t.read(s, n); }
  175.  
  176.         template<typename T>
  177.         static bool putback(T& t, typename char_type_of<T>::type c)
  178.         {   // T must be Peekable.
  179.             return t.putback(c);
  180.         }
  181.     };
  182. };
  183.  
  184. //------------------Definition of read_filter_impl----------------------------//
  185.  
  186. template<typename T>
  187. struct read_filter_impl
  188.     : mpl::if_<
  189.           detail::is_custom<T>,
  190.           operations<T>,
  191.           read_filter_impl<
  192.               BOOST_DEDUCED_TYPENAME
  193.               detail::dispatch<
  194.                   T, multichar_tag, any_tag
  195.               >::type
  196.           >
  197.       >::type
  198.     { };
  199.  
  200. template<>
  201. struct read_filter_impl<multichar_tag> {
  202.     template<typename T>
  203.     struct inner {
  204.         template<typename Source>
  205.         static std::streamsize read
  206.             ( T& t, Source& src, typename char_type_of<T>::type* s,  
  207.               std::streamsize n )
  208.         { return t.read(src, s, n); }
  209.     };
  210. };
  211.  
  212. template<>
  213. struct read_filter_impl<any_tag> {
  214.     template<typename T>
  215.     struct inner {
  216.         template<typename Source>
  217.         static std::streamsize read
  218.             ( T& t, Source& src, typename char_type_of<T>::type* s,
  219.               std::streamsize n )
  220.         {
  221.             typedef typename char_type_of<T>::type  char_type;
  222.             typedef char_traits<char_type>          traits_type;
  223.             for (std::streamsize off = 0; off < n; ++off) {
  224.                 typename traits_type::int_type c = t.get(src);
  225.                 if (traits_type::is_eof(c))
  226.                     return check_eof(off);
  227.                 if (traits_type::would_block(c))
  228.                     return off;
  229.                 s[off] = traits_type::to_char_type(c);
  230.             }
  231.             return n;
  232.         }
  233.     };
  234. };
  235.  
  236. } // End namespace detail.
  237.  
  238. } } // End namespaces iostreams, boost.
  239.  
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