1 files changed, 79 insertions, 5 deletions
diff --git a/shared/long_path_prefix.h b/shared/long_path_prefix.h
index df4c31ab..b6da9168 100644
--- a/shared/long_path_prefix.h
+++ b/shared/long_path_prefix.h
@@ -7,13 +7,13 @@
 #ifndef LONGPATHPREFIX_H_INCLUDED
 #define LONGPATHPREFIX_H_INCLUDED
 
+#include "zstring.h"
+
 #ifndef FFS_WIN
-use in windows build only!
+#error use in windows build only!
 #endif
 
-#include "zstring.h"
-
-namespace ffs3
+namespace zen
 {
 //handle filenames longer-equal 260 (== MAX_PATH) characters by applying \\?\-prefix (Reference: http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx#maxpath)
 /*
@@ -27,4 +27,78 @@ Zstring applyLongPathPrefixCreateDir(const Zstring& path); //throw() -> special
 Zstring removeLongPathPrefix(const Zstring& path); //throw()
 }
 
-#endif // LONGPATHPREFIX_H_INCLUDED
+
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+
+
+//################## implementation ##################
+
+//there are two flavors of long path prefix: one for UNC paths, one for regular paths
+const Zstring LONG_PATH_PREFIX = Zstr("\\\\?\\");
+const Zstring LONG_PATH_PREFIX_UNC = Zstr("\\\\?\\UNC");
+
+template <size_t max_path>
+inline
+Zstring applyLongPathPrefixImpl(const Zstring& path)
+{
+    assert(!path.empty()); //nicely check almost all WinAPI accesses!
+    if (path.length() >= max_path &&    //maximum allowed path length without prefix is (MAX_PATH - 1)
+        !path.StartsWith(LONG_PATH_PREFIX))
+    {
+        if (path.StartsWith(Zstr("\\\\"))) //UNC-name, e.g. \\zenju-pc\Users
+            return LONG_PATH_PREFIX_UNC + path.AfterFirst(Zchar('\\')); //convert to \\?\UNC\zenju-pc\Users
+        else
+            return LONG_PATH_PREFIX + path; //prepend \\?\ prefix
+    }
+
+    return path; //fallback
+}
+
+
+inline
+Zstring zen::applyLongPathPrefix(const Zstring& path)
+{
+    return applyLongPathPrefixImpl<MAX_PATH>(path);
+}
+
+
+inline
+Zstring zen::applyLongPathPrefixCreateDir(const Zstring& path) //throw()
+{
+    //special rule for ::CreateDirectoryEx(): MAX_PATH - 12(=^ 8.3 filename) is threshold
+    return applyLongPathPrefixImpl<MAX_PATH - 12>(path);
+}
+
+
+inline
+Zstring zen::removeLongPathPrefix(const Zstring& path) //throw()
+{
+    if (path.StartsWith(LONG_PATH_PREFIX))
+    {
+        if (path.StartsWith(LONG_PATH_PREFIX_UNC)) //UNC-name
+            return Zstring(path).Replace(LONG_PATH_PREFIX_UNC, Zstr("\\"), false);
+        else
+            return Zstring(path).Replace(LONG_PATH_PREFIX, Zstr(""), false);
+    }
+
+    return path; //fallback
+}
+
+#endif //LONGPATHPREFIX_H_INCLUDED