[111] | 1 | // file : xsd/cxx/xml/std-sax-input-source.hxx |
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| 2 | // author : Boris Kolpackov <boris@codesynthesis.com> |
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| 3 | // copyright : Copyright (c) 2005-2008 Code Synthesis Tools CC |
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| 4 | // license : GNU GPL v2 + exceptions; see accompanying LICENSE file |
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| 5 | |
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| 6 | #ifndef XSD_CXX_XML_SAX_STD_INPUT_SOURCE_HXX |
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| 7 | #define XSD_CXX_XML_SAX_STD_INPUT_SOURCE_HXX |
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| 8 | |
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| 9 | #include <istream> |
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| 10 | |
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| 11 | #include <xsd/cxx/xml/string.hxx> |
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| 12 | |
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| 13 | #include <xercesc/sax/InputSource.hpp> |
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| 14 | #include <xercesc/util/BinInputStream.hpp> |
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| 15 | |
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| 16 | namespace xsd |
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| 17 | { |
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| 18 | namespace cxx |
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| 19 | { |
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| 20 | namespace xml |
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| 21 | { |
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| 22 | namespace sax |
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| 23 | { |
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| 24 | class std_input_stream: public xercesc::BinInputStream |
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| 25 | { |
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| 26 | public : |
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| 27 | std_input_stream (std::istream& is) |
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| 28 | : is_ (is) |
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| 29 | { |
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| 30 | } |
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| 31 | |
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| 32 | #if _XERCES_VERSION >= 30000 |
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| 33 | virtual XMLFilePos |
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| 34 | curPos () const |
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| 35 | { |
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| 36 | return static_cast<XMLFilePos> (is_.tellg ()); |
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| 37 | } |
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| 38 | #else |
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| 39 | virtual unsigned int |
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| 40 | curPos () const |
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| 41 | { |
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| 42 | return static_cast<unsigned int> (is_.tellg ()); |
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| 43 | } |
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| 44 | #endif |
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| 45 | |
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| 46 | #if _XERCES_VERSION >= 30000 |
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| 47 | virtual XMLSize_t |
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| 48 | readBytes (XMLByte* const buf, const XMLSize_t size) |
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| 49 | #else |
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| 50 | virtual unsigned int |
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| 51 | readBytes (XMLByte* const buf, const unsigned int size) |
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| 52 | #endif |
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| 53 | { |
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| 54 | // Some implementations don't clear gcount if you |
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| 55 | // call read() on a stream that is in the eof state. |
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| 56 | // |
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| 57 | if (is_.eof ()) |
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| 58 | return 0; |
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| 59 | |
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| 60 | // Unset the exception failbit while we are working |
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| 61 | // with the stream. |
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| 62 | // |
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| 63 | std::ios_base::iostate old (is_.exceptions ()); |
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| 64 | is_.exceptions (old & ~std::ios_base::failbit); |
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| 65 | |
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| 66 | is_.read (reinterpret_cast<char*> (buf), |
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| 67 | static_cast<std::streamsize> (size)); |
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| 68 | |
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| 69 | // Clear the fail bit if it was caused by eof and restore |
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| 70 | // the original exception state. If there are any pending |
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| 71 | // errors then the exception will be thrown now. |
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| 72 | // |
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| 73 | if (is_.fail () && is_.eof ()) |
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| 74 | is_.clear (is_.rdstate () & ~std::ios_base::failbit); |
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| 75 | |
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| 76 | is_.exceptions (old); |
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| 77 | |
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| 78 | // Make sure that if we failed, readBytes won't be called |
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| 79 | // again. |
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| 80 | // |
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| 81 | if (!(is_.bad () || is_.fail ())) |
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| 82 | { |
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| 83 | #if _XERCES_VERSION >= 30000 |
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| 84 | return static_cast<XMLSize_t> (is_.gcount ()); |
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| 85 | #else |
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| 86 | return static_cast<unsigned int> (is_.gcount ()); |
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| 87 | #endif |
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| 88 | } |
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| 89 | else |
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| 90 | return 0; |
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| 91 | } |
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| 92 | |
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| 93 | private : |
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| 94 | std::istream& is_; |
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| 95 | }; |
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| 96 | |
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| 97 | |
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| 98 | class std_input_source: public xercesc::InputSource |
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| 99 | { |
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| 100 | public : |
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| 101 | std_input_source (std::istream& is) |
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| 102 | : is_ (&is) |
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| 103 | { |
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| 104 | } |
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| 105 | |
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| 106 | template <typename C> |
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| 107 | std_input_source (std::istream& is, const C* system_id) |
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| 108 | : xercesc::InputSource (xml::string (system_id).c_str ()), |
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| 109 | is_ (&is) |
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| 110 | { |
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| 111 | } |
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| 112 | |
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| 113 | template <typename C> |
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| 114 | std_input_source (std::istream& is, |
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| 115 | const std::basic_string<C>& system_id) |
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| 116 | : xercesc::InputSource (xml::string (system_id).c_str ()), |
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| 117 | is_ (&is) |
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| 118 | { |
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| 119 | } |
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| 120 | |
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| 121 | template <typename C> |
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| 122 | std_input_source (std::istream& is, |
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| 123 | const C* system_id, |
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| 124 | const C* public_id) |
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| 125 | : xercesc::InputSource (xml::string (system_id).c_str (), |
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| 126 | xml::string (public_id).c_str ()), |
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| 127 | is_ (&is) |
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| 128 | { |
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| 129 | } |
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| 130 | |
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| 131 | template <typename C> |
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| 132 | std_input_source (std::istream& is, |
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| 133 | const std::basic_string<C>& system_id, |
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| 134 | const std::basic_string<C>& public_id) |
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| 135 | : xercesc::InputSource (xml::string (system_id).c_str (), |
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| 136 | xml::string (public_id).c_str ()), |
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| 137 | is_ (&is) |
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| 138 | { |
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| 139 | } |
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| 140 | |
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| 141 | struct copy {}; |
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| 142 | |
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| 143 | // Throws the copy exception if this function is called more |
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| 144 | // than once. |
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| 145 | // |
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| 146 | virtual xercesc::BinInputStream* |
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| 147 | makeStream () const |
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| 148 | { |
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| 149 | if (is_ == 0) |
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| 150 | throw copy (); |
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| 151 | |
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| 152 | std::istream& is (*is_); |
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| 153 | |
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| 154 | is_ = 0; |
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| 155 | |
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| 156 | return new std_input_stream (is); |
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| 157 | } |
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| 158 | |
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| 159 | private : |
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| 160 | mutable std::istream* is_; |
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| 161 | }; |
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| 162 | } |
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| 163 | } |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | #endif // XSD_CXX_XML_SAX_STD_INPUT_SOURCE_HXX |
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