1 files changed, 148 insertions, 0 deletions
diff --git a/library/shadow.cpp b/library/shadow.cpp
new file mode 100644
index 00000000..c353bcb2
--- /dev/null
+++ b/library/shadow.cpp
@@ -0,0 +1,148 @@
+#include "shadow.h"
+#include <wx/msw/wrapwin.h> //includes "windows.h"
+#include <wx/intl.h>
+#include "../structures.h"
+
+using FreeFileSync::ShadowCopy;
+
+
+class ShadowlDllHandler //dynamically load windows API functions
+{
+    typedef bool (*CreateShadowCopyFct)(  //volumeName must end with "\", while shadowVolName does not end with "\"
+        const wchar_t* volumeName,
+        wchar_t*	   shadowVolName,
+        unsigned int   shadowBufferLen,
+        void**		   backupHandle,
+        wchar_t*	   errorMessage,
+        unsigned int   errorBufferLen);
+
+    typedef void (*ReleaseShadowCopyFct)(void* backupHandle);
+
+public:
+    static const ShadowlDllHandler& getInstance()
+    {
+        static ShadowlDllHandler instance;
+        return instance;
+    }
+
+    CreateShadowCopyFct createShadowCopy;
+    ReleaseShadowCopyFct releaseShadowCopy;
+
+private:
+    ShadowlDllHandler() :
+            createShadowCopy(NULL),
+            releaseShadowCopy(NULL),
+            hShadow(NULL)
+    {
+        //get a handle to the DLL module containing the required functionality
+        hShadow = ::LoadLibrary(L"Shadow.dll");
+        if (hShadow)
+        {
+            createShadowCopy = reinterpret_cast<CreateShadowCopyFct>(::GetProcAddress(hShadow, "createShadowCopy"));
+            releaseShadowCopy = reinterpret_cast<ReleaseShadowCopyFct>(::GetProcAddress(hShadow, "releaseShadowCopy"));
+        }
+    }
+
+    ~ShadowlDllHandler()
+    {
+        if (hShadow) ::FreeLibrary(hShadow);
+    }
+
+    HINSTANCE hShadow;
+};
+
+
+ShadowCopy::ShadowCopy() :
+        backupHandle(NULL) {}
+
+
+ShadowCopy::~ShadowCopy()
+{
+    if (backupHandle != NULL)
+        ShadowlDllHandler::getInstance().releaseShadowCopy(backupHandle);
+}
+
+
+bool ShadowCopy::isOkay()
+{
+    //check that all functions could be loaded
+    return ShadowlDllHandler::getInstance().createShadowCopy != NULL &&
+           ShadowlDllHandler::getInstance().releaseShadowCopy != NULL;
+}
+
+
+Zstring ShadowCopy::makeShadowCopy(const Zstring& inputFile) throw(FreeFileSync::FileError)
+{
+    //check if shadow copy dll was loaded correctly
+    if (!isOkay())
+        throw FileError(Zstring(_("Error copying locked file %x!")).Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\"")) + wxT("\n\n") +
+                        _("Error starting Volume Shadow Copy Service!") + wxT("\n") +
+                        _("Please copy the appropriate \"Shadow.dll\" (located in \"Shadow.zip\" archive) into the FreeFileSync installation directory to enable this feature."));
+
+
+    wchar_t volumeNameRaw[1000];
+
+    if (!GetVolumePathName(inputFile.c_str(), //__in   LPCTSTR lpszFileName,
+                           volumeNameRaw,     //__out  LPTSTR lpszVolumePathName,
+                           1000))             //__in   DWORD cchBufferLength
+        throw FileError(Zstring(_("Error copying locked file %x!")).Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\"")) + wxT("\n\n") +
+                        _("Could not determine volume name for file:") + wxT("\n\"") + inputFile + wxT("\""));
+
+    Zstring volumeNameFormatted = volumeNameRaw;
+    if (!volumeNameFormatted.EndsWith(FreeFileSync::FILE_NAME_SEPARATOR))
+        volumeNameFormatted += FreeFileSync::FILE_NAME_SEPARATOR;
+
+    if (volumeNameFormatted != realVolumeLast)
+    {
+        //release old shadow copy
+        if (backupHandle != NULL)
+        {
+            ShadowlDllHandler::getInstance().releaseShadowCopy(backupHandle);
+            backupHandle = NULL;
+        }
+        realVolumeLast.clear();   //...if next call fails...
+        shadowVolumeLast.clear(); //...if next call fails...
+
+        //start shadow volume copy service:
+        wchar_t shadowVolName[1000];
+        void* backupHandleTmp = NULL;
+        wchar_t errorMessage[1000];
+
+        if (!ShadowlDllHandler::getInstance().createShadowCopy(
+                    volumeNameFormatted.c_str(),
+                    shadowVolName,
+                    1000,
+                    &backupHandleTmp,
+                    errorMessage,
+                    1000))
+            throw FileError(Zstring(_("Error copying locked file %x!")).Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\"")) + wxT("\n\n") +
+                            _("Error starting Volume Shadow Copy Service!") + wxT("\n") +
+                            wxT("(") +  errorMessage + wxT(")"));
+
+        realVolumeLast   = volumeNameFormatted;
+        shadowVolumeLast = Zstring(shadowVolName) + FreeFileSync::FILE_NAME_SEPARATOR; //shadowVolName NEVER has a trailing backslash
+        backupHandle     = backupHandleTmp;
+    }
+
+    const size_t pos = inputFile.find(volumeNameFormatted);
+    if (pos == Zstring::npos)
+    {
+        Zstring msg = _("Volume name %x not part of filename %y!");
+        msg.Replace(wxT("%x"), Zstring(wxT("\"")) + volumeNameFormatted + wxT("\""), false);
+        msg.Replace(wxT("%y"), Zstring(wxT("\"")) + inputFile + wxT("\""), false);
+        throw FileError(Zstring(_("Error copying locked file %x!")).Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\"")) + wxT("\n\n") +
+                        msg);
+    }
+
+    //return filename alias on shadow copy volume
+    return shadowVolumeLast + Zstring(inputFile.c_str() + pos + volumeNameFormatted.length());
+}
+
+
+
+
+
+
+
+
+