Added thirdparty: boost library

thirdparty/include/boost/gil/extension/io/png/detail/base.hpp

@@ -0,0 +1,104 @@
+//
+// Copyright 2012 Christian Henning
+//
+// 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_GIL_EXTENSION_IO_PNG_DETAIL_BASE_HPP
+#define BOOST_GIL_EXTENSION_IO_PNG_DETAIL_BASE_HPP
+
+#include <boost/gil/extension/io/png/tags.hpp>
+
+#include <boost/assert.hpp>
+
+#include <memory>
+
+namespace boost { namespace gil { namespace detail {
+
+struct png_ptr_wrapper
+{
+    png_ptr_wrapper()
+    : _struct( nullptr )
+    , _info  ( nullptr )
+    {}
+
+    png_structp _struct;
+    png_infop   _info;
+};
+
+///
+/// Wrapper for libpng's png_struct and png_info object. Implements value semantics.
+///
+struct png_struct_info_wrapper
+{
+protected:
+
+    using png_ptr_t = std::shared_ptr<png_ptr_wrapper>;
+
+protected:
+
+    ///
+    /// Default Constructor
+    ///
+    png_struct_info_wrapper( bool read = true )
+    : _png_ptr( new png_ptr_wrapper()
+              , ( ( read ) ? png_ptr_read_deleter : png_ptr_write_deleter )
+              )
+    {}
+
+    png_ptr_wrapper*       get()       { return _png_ptr.get(); }
+    png_ptr_wrapper const* get() const { return _png_ptr.get(); }
+
+    png_struct*       get_struct()       { return get()->_struct; }
+    png_struct const* get_struct() const { return get()->_struct; }
+
+    png_info*       get_info()       { return get()->_info; }
+    png_info const* get_info() const { return get()->_info; }
+
+private:
+
+    static void png_ptr_read_deleter( png_ptr_wrapper* png_ptr )
+    {
+        if( png_ptr )
+        {
+            if( png_ptr->_struct && png_ptr->_info )
+            {
+                png_destroy_read_struct( &png_ptr->_struct
+                                       , &png_ptr->_info
+                                       , nullptr
+                                       );
+            }
+
+            delete png_ptr;
+            png_ptr = nullptr;
+        }
+    }
+
+    static void png_ptr_write_deleter( png_ptr_wrapper* png_ptr )
+    {
+        if( png_ptr )
+        {
+            if( png_ptr->_struct && png_ptr->_info )
+            {
+                png_destroy_write_struct( &png_ptr->_struct
+                                        , &png_ptr->_info
+                                        );
+            }
+
+            delete png_ptr;
+            png_ptr = nullptr;
+        }
+    }
+
+
+private:
+
+    png_ptr_t _png_ptr;
+};
+
+} // namespace detail
+} // namespace gil
+} // namespace boost
+
+#endif