Use Win32 Unicode APIs and expect all strings to be UTF-8 (fixes #1765)

For backward compatibility, if PROJ_LIB content is found to be not UTF-8 or
pointing to a non existing directory, then an attempt at interpretating it
in the ANSI page encoding is done.

proj_context_set_search_paths() now assumes strings to be in UTF-8, and
functions returning paths will also return values in UTF-8.

1 files changed, 16 insertions, 2 deletions

diff --git a/src/filemanager.hpp b/src/filemanager.hpp
index 9793267c..bc12a303 100644
--- a/src/filemanager.hpp
+++ b/src/filemanager.hpp
@@ -39,13 +39,26 @@ NS_PROJ_START
 
 class File;
 
+enum class FileAccess {
+    READ_ONLY,   // "rb"
+    READ_UPDATE, // "r+b"
+    CREATE,      // "w+b"
+};
+
 class FileManager {
   private:
     FileManager() = delete;
 
   public:
     // "Low-level" interface.
-    static std::unique_ptr<File> open(PJ_CONTEXT *ctx, const char *filename);
+    static std::unique_ptr<File> open(PJ_CONTEXT *ctx, const char *filename,
+                                      FileAccess access);
+    static bool exists(PJ_CONTEXT *ctx, const char *filename);
+    static bool mkdir(PJ_CONTEXT *ctx, const char *filename);
+    static bool unlink(PJ_CONTEXT *ctx, const char *filename);
+    static bool rename(PJ_CONTEXT *ctx, const char *oldPath,
+                       const char *newPath);
+    static std::string getProjLibEnvVar(PJ_CONTEXT *ctx);
 
     // "High-level" interface, honoring PROJ_LIB and the like.
     static std::unique_ptr<File> open_resource_file(PJ_CONTEXT *ctx,
@@ -66,6 +79,7 @@ class File {
   public:
     virtual ~File();
     virtual size_t read(void *buffer, size_t sizeBytes) = 0;
+    virtual size_t write(const void *buffer, size_t sizeBytes) = 0;
     virtual bool seek(unsigned long long offset, int whence = SEEK_SET) = 0;
     virtual unsigned long long tell() = 0;
     virtual void reassign_context(PJ_CONTEXT *ctx) = 0;
@@ -78,4 +92,4 @@ NS_PROJ_END
 
 //! @endcond Doxygen_Suppress
 
-#endif // FILEMANAGER_HPP_INCLUDED
\ No newline at end of file
+#endif // FILEMANAGER_HPP_INCLUDED