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#include "shadow.h"
#include <wx/msw/wrapwin.h> //includes "windows.h"
#include <wx/intl.h>
#include "systemConstants.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)
{
//check if shadow copy dll was loaded correctly
if (!isOkay())
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""));
throw FileError(errorMsg + 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
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""));
throw FileError(errorMsg + wxT("\n\n") + _("Could not determine volume name for file:") + wxT("\n\"") + inputFile.c_str() + wxT("\""));
}
Zstring volumeNameFormatted = volumeNameRaw;
if (!volumeNameFormatted.EndsWith(globalFunctions::FILE_NAME_SEPARATOR))
volumeNameFormatted += globalFunctions::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))
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\""));
throw FileError(errorMsg + wxT("\n\n") + _("Error starting Volume Shadow Copy Service!") + wxT("\n") +
wxT("(") + errorMessage + wxT(")"));
}
realVolumeLast = volumeNameFormatted;
shadowVolumeLast = Zstring(shadowVolName) + globalFunctions::FILE_NAME_SEPARATOR; //shadowVolName NEVER has a trailing backslash
backupHandle = backupHandleTmp;
}
const size_t pos = inputFile.find(volumeNameFormatted);
if (pos == Zstring::npos)
{
wxString errorMsg = _("Error copying locked file %x!");
errorMsg.Replace(wxT("%x"), Zstring(wxT("\"")) + inputFile + wxT("\""));
wxString msg = _("Volume name %x not part of filename %y!");
msg.Replace(wxT("%x"), wxString(wxT("\"")) + volumeNameFormatted.c_str() + wxT("\""), false);
msg.Replace(wxT("%y"), wxString(wxT("\"")) + inputFile.c_str() + wxT("\""), false);
throw FileError(errorMsg + wxT("\n\n") + msg);
}
//return filename alias on shadow copy volume
return shadowVolumeLast + Zstring(inputFile.c_str() + pos + volumeNameFormatted.length());
}
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