+// Returns -1 if (Time1 < Time2), +1 if (Time1 > Time2), or 0 if
+// (Time1 == Time2). Precision is only to the nearest second; since
+// this is used for sorting boot loader entries, differences smaller
+// than this are likely to be meaningless (and unlikely!).
+INTN TimeComp(IN EFI_TIME *Time1, IN EFI_TIME *Time2) {
+ INT64 Time1InSeconds, Time2InSeconds;
+
+ // Following values are overestimates; I'm assuming 31 days in every month.
+ // This is fine for the purpose of this function, which is limited
+ Time1InSeconds = Time1->Second + (Time1->Minute * 60) + (Time1->Hour * 3600) + (Time1->Day * 86400) +
+ (Time1->Month * 2678400) + ((Time1->Year - 1998) * 32140800);
+ Time2InSeconds = Time2->Second + (Time2->Minute * 60) + (Time2->Hour * 3600) + (Time2->Day * 86400) +
+ (Time2->Month * 2678400) + ((Time2->Year - 1998) * 32140800);
+ if (Time1InSeconds < Time2InSeconds)
+ return (-1);
+ else if (Time1InSeconds > Time2InSeconds)
+ return (1);
+
+ return 0;
+} // INTN TimeComp()
+
+// Adds a loader list element, keeping it sorted by date. Returns the new
+// first element (the one with the most recent date).
+static struct LOADER_LIST * AddLoaderListEntry(struct LOADER_LIST *LoaderList, struct LOADER_LIST *NewEntry) {
+ struct LOADER_LIST *LatestEntry, *CurrentEntry, *PrevEntry = NULL;
+
+ LatestEntry = CurrentEntry = LoaderList;
+ if (LoaderList == NULL) {
+ LatestEntry = NewEntry;
+ } else {
+ while ((CurrentEntry != NULL) && (TimeComp(&(NewEntry->TimeStamp), &(CurrentEntry->TimeStamp)) < 0)) {
+ PrevEntry = CurrentEntry;
+ CurrentEntry = CurrentEntry->NextEntry;
+ } // while
+ NewEntry->NextEntry = CurrentEntry;
+ if (PrevEntry == NULL) {
+ LatestEntry = NewEntry;
+ } else {
+ PrevEntry->NextEntry = NewEntry;
+ } // if/else
+ } // if/else
+ return (LatestEntry);
+} // static VOID AddLoaderListEntry()
+
+// Delete the LOADER_LIST linked list
+static VOID CleanUpLoaderList(struct LOADER_LIST *LoaderList) {
+ struct LOADER_LIST *Temp;
+
+ while (LoaderList != NULL) {
+ Temp = LoaderList;
+ LoaderList = LoaderList->NextEntry;
+ MyFreePool(Temp->FileName);
+ MyFreePool(Temp);
+ } // while
+} // static VOID CleanUpLoaderList()
+
+// Returns FALSE if the specified file/volume matches the GlobalConfig.DontScanDirs
+// or GlobalConfig.DontScanVolumes specification, or if Path points to a volume
+// other than the one specified by Volume, or if the specified path is SelfDir.
+// Returns TRUE if none of these conditions is met -- that is, if the path is
+// eligible for scanning.
+static BOOLEAN ShouldScan(REFIT_VOLUME *Volume, CHAR16 *Path) {
+ CHAR16 *VolName = NULL, *DontScanDir, *PathCopy = NULL;
+ UINTN i = 0;
+ BOOLEAN ScanIt = TRUE;
+
+ if (IsIn(Volume->VolName, GlobalConfig.DontScanVolumes))
+ return FALSE;
+
+ if ((StriCmp(Path, SelfDirPath) == 0) && (Volume->DeviceHandle == SelfVolume->DeviceHandle))
+ return FALSE;
+
+ // See if Path includes an explicit volume declaration that's NOT Volume....
+ PathCopy = StrDuplicate(Path);
+ if (SplitVolumeAndFilename(&PathCopy, &VolName)) {
+ VolumeNumberToName(Volume, &VolName);
+ if (VolName && StriCmp(VolName, Volume->VolName) != 0) {
+ ScanIt = FALSE;
+ } // if
+ } // if Path includes volume specification
+ MyFreePool(PathCopy);
+ MyFreePool(VolName);
+ VolName = NULL;
+
+ // See if Volume is in GlobalConfig.DontScanDirs....
+ while ((DontScanDir = FindCommaDelimited(GlobalConfig.DontScanDirs, i++)) && ScanIt) {
+ SplitVolumeAndFilename(&DontScanDir, &VolName);
+ CleanUpPathNameSlashes(DontScanDir);
+ VolumeNumberToName(Volume, &VolName);
+ if (VolName != NULL) {
+ if ((StriCmp(VolName, Volume->VolName) == 0) && (StriCmp(DontScanDir, Path) == 0))
+ ScanIt = FALSE;
+ } else {
+ if (StriCmp(DontScanDir, Path) == 0)
+ ScanIt = FALSE;
+ }
+ MyFreePool(DontScanDir);
+ MyFreePool(VolName);
+ DontScanDir = NULL;
+ } // while()
+
+ return ScanIt;
+} // BOOLEAN ShouldScan()
+
+// Returns TRUE if the file is byte-for-byte identical with the fallback file
+// on the volume AND if the file is not itself the fallback file; returns
+// FALSE if the file is not identical to the fallback file OR if the file
+// IS the fallback file. Intended for use in excluding the fallback boot
+// loader when it's a duplicate of another boot loader.
+static BOOLEAN DuplicatesFallback(IN REFIT_VOLUME *Volume, IN CHAR16 *FileName) {
+ CHAR8 *FileContents, *FallbackContents;
+ EFI_FILE_HANDLE FileHandle, FallbackHandle;
+ EFI_FILE_INFO *FileInfo, *FallbackInfo;
+ UINTN FileSize = 0, FallbackSize = 0;
+ EFI_STATUS Status;
+ BOOLEAN AreIdentical = FALSE;
+
+ if (!FileExists(Volume->RootDir, FileName) || !FileExists(Volume->RootDir, FALLBACK_FULLNAME))
+ return FALSE;
+
+ CleanUpPathNameSlashes(FileName);
+
+ if (StriCmp(FileName, FALLBACK_FULLNAME) == 0)
+ return FALSE; // identical filenames, so not a duplicate....
+
+ Status = refit_call5_wrapper(Volume->RootDir->Open, Volume->RootDir, &FileHandle, FileName, EFI_FILE_MODE_READ, 0);
+ if (Status == EFI_SUCCESS) {
+ FileInfo = LibFileInfo(FileHandle);
+ FileSize = FileInfo->FileSize;
+ } else {
+ return FALSE;
+ }
+
+ Status = refit_call5_wrapper(Volume->RootDir->Open, Volume->RootDir, &FallbackHandle, FALLBACK_FULLNAME, EFI_FILE_MODE_READ, 0);
+ if (Status == EFI_SUCCESS) {
+ FallbackInfo = LibFileInfo(FallbackHandle);
+ FallbackSize = FallbackInfo->FileSize;
+ } else {
+ refit_call1_wrapper(FileHandle->Close, FileHandle);
+ return FALSE;
+ }
+
+ if (FallbackSize != FileSize) { // not same size, so can't be identical
+ AreIdentical = FALSE;
+ } else { // could be identical; do full check....
+ FileContents = AllocatePool(FileSize);
+ FallbackContents = AllocatePool(FallbackSize);
+ if (FileContents && FallbackContents) {
+ Status = refit_call3_wrapper(FileHandle->Read, FileHandle, &FileSize, FileContents);
+ if (Status == EFI_SUCCESS) {
+ Status = refit_call3_wrapper(FallbackHandle->Read, FallbackHandle, &FallbackSize, FallbackContents);
+ }
+ if (Status == EFI_SUCCESS) {
+ AreIdentical = (CompareMem(FileContents, FallbackContents, FileSize) == 0);
+ } // if
+ } // if
+ MyFreePool(FileContents);
+ MyFreePool(FallbackContents);
+ } // if/else
+
+ // BUG ALERT: Some systems (e.g., DUET, some Macs with large displays) crash if the
+ // following two calls are reversed. Go figure....
+ refit_call1_wrapper(FileHandle->Close, FallbackHandle);
+ refit_call1_wrapper(FileHandle->Close, FileHandle);
+ return AreIdentical;
+} // BOOLEAN DuplicatesFallback()
+
+// Returns FALSE if two measures of file size are identical for a single file,
+// TRUE if not or if the file can't be opened and the other measure is non-0.
+// Despite the function's name, this isn't really a direct test of symbolic
+// link status, since EFI doesn't officially support symlinks. It does seem
+// to be a reliable indicator, though. (OTOH, some disk errors might cause a
+// file to fail to open, which would return a false positive -- but as I use
+// this function to exclude symbolic links from the list of boot loaders,
+// that would be fine, since such boot loaders wouldn't work.)
+static BOOLEAN IsSymbolicLink(REFIT_VOLUME *Volume, CHAR16 *Path, EFI_FILE_INFO *DirEntry) {
+ EFI_FILE_HANDLE FileHandle;
+ EFI_FILE_INFO *FileInfo = NULL;
+ EFI_STATUS Status;
+ UINTN FileSize2 = 0;
+ CHAR16 *FileName;
+
+ FileName = StrDuplicate(Path);
+ MergeStrings(&FileName, DirEntry->FileName, L'\\');
+ CleanUpPathNameSlashes(FileName);
+
+ Status = refit_call5_wrapper(Volume->RootDir->Open, Volume->RootDir, &FileHandle, FileName, EFI_FILE_MODE_READ, 0);
+ if (Status == EFI_SUCCESS) {
+ FileInfo = LibFileInfo(FileHandle);
+ if (FileInfo != NULL)
+ FileSize2 = FileInfo->FileSize;
+ }
+
+ MyFreePool(FileName);
+ MyFreePool(FileInfo);
+
+ return (DirEntry->FileSize != FileSize2);
+} // BOOLEAN IsSymbolicLink()
+