DXF: update to use Unicode-aware file open routines on Windows.

extlib/libdxfrw

@@ -1 +1 @@
-Subproject commit e389be82d060ee923b17b9bc574438f3272ef2ad
+Subproject commit 8f958955f54668c142ded760dc951ffd16d9c71b

src/exportvector.cpp

@@ -696,11 +696,19 @@ void DxfFileWriter::Bezier(SBezier *sb) {
 }
 
 void DxfFileWriter::FinishAndCloseFile() {
-    dxfRW dxf(filename.c_str());
+    dxfRW dxf;
+
     DxfWriteInterface interface = {};
     interface.writer = this;
     interface.dxf    = &dxf;
-    dxf.write(&interface, DRW::AC1021, /*bin=*/false);
+
+    std::fstream stream = ssfstream(filename, std::ios_base::out);
+    if(!stream.good()) {
+        Error("Couldn't write to '%s'", filename.c_str());
+        return;
+    }
+
+    dxf.write(stream, &interface, DRW::AC1021, /*bin=*/false);
     paths.clear();
     constraint = NULL;
 

src/importdxf.cpp

@@ -900,13 +900,20 @@ public:
 };
 
 void ImportDxf(const std::string &filename) {
-    SS.UndoRemember();
-    dxfRW dxf(filename.c_str());
     DxfReadInterface interface;
     interface.clearBlockTransform();
-    if(!dxf.read(&interface, /*ext=*/false)) {
-        Error("Corrupted DXF file!");
+
+    std::fstream stream = ssfstream(filename, std::ios_base::in);
+    if(!stream.good()) {
+        Error("Couldn't read from '%s'", filename.c_str());
+        return;
     }
+
+    SS.UndoRemember();
+    if(!dxfRW().read(stream, &interface, /*ext=*/false)) {
+        Error("Corrupted DXF file.");
+    }
+
     if(interface.unknownEntities > 0) {
         Message(ssprintf("%u DXF entities of unknown type were ignored.",
                          interface.unknownEntities).c_str());
@@ -914,13 +921,20 @@ void ImportDxf(const std::string &filename) {
 }
 
 void ImportDwg(const std::string &filename) {
-    SS.UndoRemember();
-    dwgR dwg(filename.c_str());
     DxfReadInterface interface;
     interface.clearBlockTransform();
-    if(!dwg.read(&interface, /*ext=*/false)) {
-        Error("Corrupted DWG file!");
+
+    std::fstream stream = ssfstream(filename, std::ios_base::in);
+    if(!stream.good()) {
+        Error("Couldn't read from '%s'", filename.c_str());
+        return;
     }
+
+    SS.UndoRemember();
+    if(!dwgR().read(stream, &interface, /*ext=*/false)) {
+        Error("Corrupted DWG file.");
+    }
+
     if(interface.unknownEntities > 0) {
         Message(ssprintf("%u DWG entities of unknown type were ignored.",
                          interface.unknownEntities).c_str());

src/platform/unixutil.cpp

@@ -82,6 +82,13 @@ FILE *ssfopen(const std::string &filename, const char *mode)
     return fopen(filename.c_str(), mode);
 }
 
+std::fstream ssfstream(const std::string &filename, std::ios_base::openmode mode)
+{
+    ssassert(filename.length() == strlen(filename.c_str()),
+             "Unexpected null byte in middle of a path");
+    return std::fstream(filename, mode);
+}
+
 void ssremove(const std::string &filename)
 {
     ssassert(filename.length() == strlen(filename.c_str()),

src/platform/w32util.cpp

@@ -117,7 +117,7 @@ std::string PathSepUnixToPlatform(const std::string &filename)
     return result;
 }
 
-FILE *ssfopen(const std::string &filename, const char *mode)
+static std::string MakeUNCFilename(const std::string &filename)
 {
     // Prepend \\?\ UNC prefix unless already an UNC path.
     // We never try to fopen paths that are not absolute or
@@ -126,10 +126,22 @@ FILE *ssfopen(const std::string &filename, const char *mode)
     std::string uncFilename = filename;
     if(uncFilename.substr(0, 2) != "\\\\")
         uncFilename = "\\\\?\\" + uncFilename;
+    return uncFilename;
+}
 
+FILE *ssfopen(const std::string &filename, const char *mode)
+{
     ssassert(filename.length() == strlen(filename.c_str()),
              "Unexpected null byte in middle of a path");
-    return _wfopen(Widen(uncFilename).c_str(), Widen(mode).c_str());
+    return _wfopen(Widen(MakeUNCFilename(filename)).c_str(), Widen(mode).c_str());
+}
+
+std::fstream ssfstream(const std::string &filename, std::ios_base::openmode mode)
+{
+    std::string uncFilename = MakeUNCFilename(filename);
+    ssassert(filename.length() == strlen(filename.c_str()),
+             "Unexpected null byte in middle of a path");
+    return std::fstream(Widen(MakeUNCFilename(filename)).c_str(), mode);
 }
 
 void ssremove(const std::string &filename)

src/solvespace.h

@@ -29,6 +29,7 @@
 #include <map>
 #include <set>
 #include <chrono>
+#include <fstream>
 
 // We declare these in advance instead of simply using FT_Library
 // (defined as typedef FT_LibraryRec_* FT_Library) because including
@@ -154,6 +155,7 @@ bool PathEqual(const std::string &a, const std::string &b);
 std::string PathSepPlatformToUnix(const std::string &filename);
 std::string PathSepUnixToPlatform(const std::string &filename);
 FILE *ssfopen(const std::string &filename, const char *mode);
+std::fstream ssfstream(const std::string &filename, std::ios_base::openmode mode);
 void ssremove(const std::string &filename);
 
 const size_t MAX_RECENT = 8;