use gxrio internally for reading pdb files

include/cif++/pdb/io.hpp

@@ -32,6 +32,7 @@ namespace cif::pdb
 {
 {
 
 
 file read(std::istream &is);
 file read(std::istream &is);
+file read(const std::filesystem::path &file);
 
 
 void write(std::ostream &os, const datablock &db);
 void write(std::ostream &os, const datablock &db);
 
 

src/pdb/pdb2cif.cpp

@@ -30,6 +30,7 @@
 #include <stack>
 #include <stack>
 
 
 #include <cif++.hpp>
 #include <cif++.hpp>
+#include <gxrio.hpp>
 
 
 #include <cif++/pdb/pdb2cif.hpp>
 #include <cif++/pdb/pdb2cif.hpp>
 #include <cif++/pdb/pdb2cif_remark_3.hpp>
 #include <cif++/pdb/pdb2cif_remark_3.hpp>
@@ -6195,4 +6196,13 @@ file read(std::istream &is)
 	return result;
 	return result;
 }
 }
 
 
+file read(const std::filesystem::path &file)
+{
+	gxrio::ifstream in(file);
+	if (not in.is_open())
+		throw std::runtime_error("Could not open file " + file.string() + " for input");
+	
+	return read(in);
+}
+
 } // namespace pdbx
 } // namespace pdbx
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