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#include "fileID.h"
#ifdef FFS_WIN
#include "staticAssert.h"
#include <wx/msw/wrapwin.h> //includes "windows.h"
#include "longPathPrefix.h"
#elif defined FFS_LINUX
#endif
#ifdef FFS_WIN
class CloseHandleOnExit
{
public:
CloseHandleOnExit(HANDLE fileHandle) : fileHandle_(fileHandle) {}
~CloseHandleOnExit()
{
::CloseHandle(fileHandle_);
}
private:
HANDLE fileHandle_;
};
Utility::FileID Utility::retrieveFileID(const Zstring& filename)
{
//ensure our DWORD_FFS really is the same as DWORD
assert_static(sizeof(Utility::FileID::DWORD_FFS) == sizeof(DWORD));
//WARNING: CreateFile() is SLOW, while GetFileInformationByHandle() is quite cheap!
//http://msdn.microsoft.com/en-us/library/aa363788(VS.85).aspx
const HANDLE hFile = ::CreateFile(FreeFileSync::applyLongPathPrefix(filename).c_str(),
0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, //FILE_FLAG_BACKUP_SEMANTICS needed to open directories
NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
CloseHandleOnExit dummy(hFile);
BY_HANDLE_FILE_INFORMATION info;
if (::GetFileInformationByHandle(hFile, &info))
{
return Utility::FileID(info.dwVolumeSerialNumber,
info.nFileIndexHigh,
info.nFileIndexLow);
}
}
return Utility::FileID(); //empty ID
}
#elif defined FFS_LINUX
Utility::FileID Utility::retrieveFileID(const Zstring& filename)
{
struct stat fileInfo;
if (::lstat(filename.c_str(), &fileInfo) == 0) //lstat() does not resolve symlinks
return Utility::FileID(fileInfo.st_dev, fileInfo.st_ino);
return Utility::FileID(); //empty ID
}
#endif
bool Utility::sameFileSpecified(const Zstring& file1, const Zstring& file2)
{
const Utility::FileID id1 = retrieveFileID(file1);
const Utility::FileID id2 = retrieveFileID(file2);
if (id1 != FileID() && id2 != FileID())
return id1 == id2;
return false;
}
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