*/
FLAC__bool grabbag__file_change_stats(const char *filename, FLAC__bool read_only);
-/* returns true iff stat() succeeds for both files and they have the same device and inode */
-/*@@@ this does not work on windows so for that the function just returns !strcmp(f1,f2) */
+/* returns true iff stat() succeeds for both files and they have the same device and inode. */
+/* on windows, uses GetFileInformationByHandle() to compare */
FLAC__bool grabbag__file_are_same(const char *f1, const char *f2);
/* attempts to make writable before unlinking */
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* for strrchr() */
+#if defined _WIN32 && !defined __CYGWIN__
+// for GetFileInformationByHandle() etc
+#include <Windows.h>
+#include <Winbase.h>
+#endif
#include "share/grabbag.h"
FLAC__bool grabbag__file_are_same(const char *f1, const char *f2)
{
#if defined _MSC_VER || defined __MINGW32__
- return f1 && f2 && 0 == strcmp(f1, f2); /*@@@@@@ need better method than strcmp */
+ /* see
+ * http://www.hydrogenaudio.org/forums/index.php?showtopic=49439&pid=444300&st=0
+ * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/getfileinformationbyhandle.asp
+ * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/by_handle_file_information_str.asp
+ * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/createfile.asp
+ * apparently both the files have to be open at the same time for the comparison to work
+ */
+ FLAC__bool same = false;
+ BY_HANDLE_FILE_INFORMATION info1, info2;
+ HANDLE h1, h2;
+ BOOL ok = 1;
+ h1 = CreateFile(f1, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+ h2 = CreateFile(f2, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+ if(h1 == INVALID_HANDLE_VALUE || h2 == INVALID_HANDLE_VALUE)
+ ok = 0;
+ ok &= GetFileInformationByHandle(h1, &info1);
+ ok &= GetFileInformationByHandle(h2, &info2);
+ if(ok)
+ same =
+ info1.dwVolumeSerialNumber == info2.dwVolumeSerialNumber &&
+ info1.nFileIndexHigh == info2.nFileIndexHigh &&
+ info1.nFileIndexLow == info2.nFileIndexLow
+ ;
+ if(h1 != INVALID_HANDLE_VALUE)
+ CloseHandle(h1);
+ if(h2 != INVALID_HANDLE_VALUE)
+ CloseHandle(h2);
+ return same;
#else
struct stat s1, s2;
return f1 && f2 && stat(f1, &s1) == 0 && stat(f2, &s2) == 0 && s1.st_ino == s2.st_ino && s1.st_dev == s2.st_dev;