1 files changed, 95 insertions, 0 deletions
diff --git a/shared/longPathPrefix.cpp b/shared/longPathPrefix.cpp
new file mode 100644
index 00000000..9ce74c8b
--- /dev/null
+++ b/shared/longPathPrefix.cpp
@@ -0,0 +1,95 @@
+#include "longPathPrefix.h"
+#include <boost/scoped_array.hpp>
+#include <wx/msw/wrapwin.h> //includes "windows.h"
+#include "fileError.h"
+#include "systemFunctions.h"
+#include "stringConv.h"
+#include <wx/intl.h>
+
+namespace
+{
+Zstring getFullPathName(const Zstring& relativeName, size_t proposedBufferSize = 1000)
+{
+    using namespace FreeFileSync;
+
+    boost::scoped_array<DefaultChar> fullPath(new DefaultChar[proposedBufferSize]);
+    const DWORD rv = ::GetFullPathName(
+                         relativeName.c_str(), //__in   LPCTSTR lpFileName,
+                         proposedBufferSize,   //__in   DWORD nBufferLength,
+                         fullPath.get(),       //__out  LPTSTR lpBuffer,
+                         NULL);                //__out  LPTSTR *lpFilePart
+    if (rv == 0 || rv == proposedBufferSize)
+        throw FileError(wxString(_("Error resolving full path name:")) + wxT("\n\"") + zToWx(relativeName) + wxT("\"") +
+                        wxT("\n\n") + FreeFileSync::getLastErrorFormatted());
+    if (rv > proposedBufferSize)
+        return getFullPathName(relativeName, rv);
+
+    return fullPath.get();
+}
+}
+
+
+Zstring FreeFileSync::resolveRelativePath(const Zstring& path) //throw()
+{
+    try
+    {
+        return getFullPathName(path);
+    }
+    catch (...)
+    {
+        return path;
+    }
+}
+
+
+//there are two flavors of long path prefix: one for UNC paths, one for regular paths
+const Zstring LONG_PATH_PREFIX = DefaultStr("\\\\?\\");
+const Zstring LONG_PATH_PREFIX_UNC = DefaultStr("\\\\?\\UNC");
+
+template <size_t max_path>
+inline
+Zstring applyLongPathPrefixImpl(const Zstring& path)
+{
+    if (    path.length() >= max_path &&    //maximum allowed path length without prefix is (MAX_PATH - 1)
+            !path.StartsWith(LONG_PATH_PREFIX))
+    {
+        if (path.StartsWith(DefaultStr("\\\\"))) //UNC-name, e.g. \\zenju-pc\Users
+            return LONG_PATH_PREFIX_UNC + path.AfterFirst(DefaultChar('\\')); //convert to \\?\UNC\zenju-pc\Users
+        else
+            return LONG_PATH_PREFIX + path; //prepend \\?\ prefix
+    }
+
+    //fallback
+    return path;
+}
+
+
+Zstring FreeFileSync::applyLongPathPrefix(const Zstring& path)
+{
+    return applyLongPathPrefixImpl<MAX_PATH>(path);
+}
+
+
+Zstring FreeFileSync::applyLongPathPrefixCreateDir(const Zstring& path) //throw()
+{
+    //special rule for ::CreateDirectoryEx(): MAX_PATH - 12(=^ 8.3 filename) is threshold
+    return applyLongPathPrefixImpl<MAX_PATH - 12>(path);
+}
+
+
+Zstring FreeFileSync::removeLongPathPrefix(const Zstring& path) //throw()
+{
+    if (path.StartsWith(LONG_PATH_PREFIX))
+    {
+        Zstring finalPath = path;
+        if (path.StartsWith(LONG_PATH_PREFIX_UNC)) //UNC-name
+            finalPath.Replace(LONG_PATH_PREFIX_UNC, DefaultStr("\\"), false);
+        else
+            finalPath.Replace(LONG_PATH_PREFIX, DefaultStr(""), false);
+        return finalPath;
+    }
+
+    //fallback
+    return path;
+}
+