Author: fireball Date: Fri Jan 23 04:26:02 2009 New Revision: 39034
URL: http://svn.reactos.org/svn/reactos?rev=39034&view=rev Log: Alex Vlasov - Implement operations with directory entries.
Modified: trunk/reactos/drivers/filesystems/fastfat_new/direntry.c
Modified: trunk/reactos/drivers/filesystems/fastfat_new/direntry.c URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfat... ============================================================================== --- trunk/reactos/drivers/filesystems/fastfat_new/direntry.c [iso-8859-1] (original) +++ trunk/reactos/drivers/filesystems/fastfat_new/direntry.c [iso-8859-1] Fri Jan 23 04:26:02 2009 @@ -3,7 +3,7 @@ * LICENSE: GPL - See COPYING in the top level directory * FILE: drivers/filesystems/fastfat/direntry.c * PURPOSE: Directory entries - * PROGRAMMERS: + * PROGRAMMERS: Alexey Vlasov */
/* INCLUDES *****************************************************************/ @@ -11,7 +11,598 @@ #define NDEBUG #include "fastfat.h"
+/* PROTOTYPES ***************************************************************/ +#define BYTES_PER_DIRENT_LOG 0x05 + +typedef struct _FAT_ENUM_DIR_CONTEXT *PFAT_ENUM_DIR_CONTEXT; + +typedef ULONG (*PFAT_COPY_DIRENT_ROUTINE) (struct _FAT_ENUM_DIR_CONTEXT *, PDIR_ENTRY, PVOID); + +typedef struct _FAT_ENUM_DIR_CONTEXT +{ + PFILE_OBJECT FileObject; + LARGE_INTEGER PageOffset; + LONGLONG BeyoundLastEntryOffset; + PVOID PageBuffer; + PBCB PageBcb; + + /* + * We should always cache short file name + * because we never know if there is a long + * name for the dirent and when we find out + * that our base dirent might become unpinned. + */ + UCHAR DirentFileName[RTL_FIELD_SIZE(DIR_ENTRY, FileName) + 1]; + PFAT_COPY_DIRENT_ROUTINE CopyDirent; + LONGLONG BytesPerClusterMask; + /* + * The following fields are + * set by the copy routine + */ + PULONG NextEntryOffset; + PULONG FileNameLength; + PWCHAR FileName; +} FAT_ENUM_DIR_CONTEXT; + +typedef enum _FILE_TIME_INDEX { + FileCreationTime = 0, + FileLastAccessTime, + FileLastWriteTime, + FileChangeTime +} FILE_TIME_INDEX; + +VOID +FatQueryFileTimes( + OUT PLARGE_INTEGER FileTimes, + IN PDIR_ENTRY Dirent); + +VOID +Fat8dot3ToUnicodeString( + OUT PUNICODE_STRING FileName, + IN PUCHAR ShortName, + IN UCHAR Flags); + +ULONG +FatDirentToDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + +ULONG +FatDirentToFullDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + +ULONG +FatDirentToIdFullDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + +ULONG +FatDirentToBothDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + +ULONG +FatDirentToIdBothDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + +ULONG +FatDirentToNamesInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + +ULONG +FatDirentToObjectIdInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer); + /* FUNCTIONS *****************************************************************/
+FORCEINLINE +VOID +FatDateTimeToSystemTime( + OUT PLARGE_INTEGER SystemTime, + IN PFAT_DATETIME FatDateTime, + IN UCHAR TenMs OPTIONAL) +{ + TIME_FIELDS TimeFields; + + /* + * Setup time fields. + */ + TimeFields.Year = FatDateTime->Date.Year + 1980; + TimeFields.Month = FatDateTime->Date.Month; + TimeFields.Day = FatDateTime->Date.Day; + TimeFields.Hour = FatDateTime->Time.Hour; + TimeFields.Minute = FatDateTime->Time.Minute; + TimeFields.Second = (FatDateTime->Time.DoubleSeconds << 1); + /* + * Adjust up to 10 milliseconds + * if the parameter was supplied + */ + if (ARGUMENT_PRESENT(TenMs)) + { + TimeFields.Second += TenMs / 100; + TimeFields.Milliseconds = (TenMs % 100) * 10; + } + else + { + TimeFields.Milliseconds = 0; + } + /* + * Fix seconds value that might get beyoud the bound. + */ + if (TimeFields.Second > 59) + TimeFields.Second = 0; + /* + * Perform ceonversion to system time if possible. + */ + if (RtlTimeFieldsToTime(&TimeFields, SystemTime)) { + /* Convert to system time */ + ExLocalTimeToSystemTime( SystemTime, SystemTime ); + } + else + { + /* Set to default time if conversion failed */ + *SystemTime = FatGlobalData.DefaultFileTime; + } +} + +VOID +FatQueryFileTimes( + OUT PLARGE_INTEGER FileTimes, + IN PDIR_ENTRY Dirent) +{ + /* + * Convert LastWriteTime + */ + FatDateTimeToSystemTime( + &FileTimes[FileLastWriteTime], + &Dirent->LastWriteDateTime, 0); + /* + * All other time fileds are valid (according to MS) + * only if Win31 compatability mode is set. + */ + if (FatGlobalData.Win31FileSystem) + { + /* We can avoid calling conversion routine + * if time in dirent is 0 or equals to already + * known time (LastWriteTime). + */ + if (Dirent->CreationDateTime.Value == 0) + { + /* Set it to default time */ + FileTimes[FileCreationTime] = FatGlobalData.DefaultFileTime; + } + else if (Dirent->CreationDateTime.Value + == Dirent->LastWriteDateTime.Value) + { + /* Assign the already known time */ + FileTimes[FileCreationTime] = FileTimes[FileLastWriteTime]; + /* Adjust milliseconds from extra dirent field */ + FileTimes[FileCreationTime].QuadPart + += (ULONG) Dirent->CreationTimeTenMs * 100000; + } + else + { + /* Perform conversion */ + FatDateTimeToSystemTime( + &FileTimes[FileCreationTime], + &Dirent->CreationDateTime, + Dirent->CreationTimeTenMs); + } + if (Dirent->LastAccessDate.Value == 0) + { + /* Set it to default time */ + FileTimes[FileLastAccessTime] = FatGlobalData.DefaultFileTime; + } + else if (Dirent->LastAccessDate.Value + == Dirent->LastWriteDateTime.Date.Value) + { + /* Assign the already known time */ + FileTimes[FileLastAccessTime] = FileTimes[FileLastWriteTime]; + } + else + { + /* Perform conversion */ + FAT_DATETIME LastAccessDateTime; + + LastAccessDateTime.Date.Value = Dirent->LastAccessDate.Value; + LastAccessDateTime.Time.Value = 0; + FatDateTimeToSystemTime( + &FileTimes[FileLastAccessTime], + &LastAccessDateTime, 0); + } + } +} + +VOID +Fat8dot3ToUnicodeString( + OUT PUNICODE_STRING FileName, + IN PUCHAR ShortName, + IN UCHAR Flags) +{ + PCHAR Name; + UCHAR Index, Ext = 0; + OEM_STRING Oem; + + Name = Add2Ptr(FileName->Buffer, 0x0c, PCHAR); + RtlCopyMemory(Name, ShortName, 0x0b); + + /* Restore the name byte used to mark deleted entries. */ + if (Name[0] == 0x05) + Name[0] |= 0xe0; + + /* Locate the end of name part. */ + for (Index = 0; Index < 0x08 + && Name[Index] != 0x20; Index++); + + /* Locate the end of extension part */ + if (Name[0x08] != 0x20) + { + Ext = 0x2; + Name[Index++] = 0x2e; + Name[Index++] = Name[0x08]; + if ((Name[Index] = Name[0x09]) != 0x20) + { + Index ++; Ext ++; + } + if ((Name[Index] = Name[0x0a]) != 0x20) + { + Index ++; Ext ++; + } + } + /* Perform Oem to Unicode conversion. */ + Oem.Buffer = Name; + Oem.Length = Index; + Oem.MaximumLength = Index; + RtlOemStringToUnicodeString(FileName, &Oem, FALSE); + Index = FlagOn(Flags, FAT_CASE_LOWER_BASE|FAT_CASE_LOWER_EXT); + if (Index > 0) + { + /* Downcase the whole name */ + if (Index == (FAT_CASE_LOWER_BASE|FAT_CASE_LOWER_EXT)) + { + RtlUpcaseUnicodeString(FileName, FileName, FALSE); + } + else + { + if (Index == FAT_CASE_LOWER_EXT) + { + /* Set extension for downcase */ + Oem.Length = Ext * sizeof(WCHAR); + Oem.Buffer = Add2Ptr( + FileName->Buffer, + FileName->Length - Oem.Length, + PSTR); + } + else + { + /* Set base name for downcase */ + Oem.Buffer = (PSTR) FileName->Buffer; + Oem.Length = FileName->Length + - Ext * sizeof(WCHAR); + } + Oem.MaximumLength = Oem.Length; + RtlUpcaseUnicodeString( + (PUNICODE_STRING)&Oem, + (PUNICODE_STRING)&Oem, + FALSE); + } + } +} + +ULONG +FatDirentToDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_DIRECTORY_INFORMATION Info; + //UNICODE_STRING FileName; + + Info = (PFILE_DIRECTORY_INFORMATION) Buffer; + /* Setup Attributes */ + Info->FileAttributes = Dirent->Attributes; + /* Setup times */ + FatQueryFileTimes(&Info->CreationTime, Dirent); + /* Setup sizes */ + Info->EndOfFile.QuadPart = Dirent->FileSize; + Info->AllocationSize.QuadPart = + (Context->BytesPerClusterMask + Dirent->FileSize) + & ~(Context->BytesPerClusterMask); + //FileName.Buffer = Info->ShortName; + //FileName.MaximumLength = sizeof(Info->ShortName); + // FatQueryShortName(&FileName, Dirent); + // Info->ShortNameLength = (CCHAR) FileName.Length; + Info->NextEntryOffset = sizeof(*Info); + /* + * Associate LFN buffer and length pointers + * of this entry with the context. + */ + Context->NextEntryOffset = &Info->NextEntryOffset; + Context->FileName = Info->FileName; + Context->FileNameLength = &Info->FileNameLength; + return Info->NextEntryOffset; +} + +ULONG +FatDirentToFullDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_FULL_DIR_INFORMATION Info; + //UNICODE_STRING FileName; + + Info = (PFILE_FULL_DIR_INFORMATION) Buffer; + /* Setup Attributes */ + Info->FileAttributes = Dirent->Attributes; + /* Setup times */ + FatQueryFileTimes(&Info->CreationTime, Dirent); + /* Setup sizes */ + Info->EndOfFile.QuadPart = Dirent->FileSize; + Info->AllocationSize.QuadPart = + (Context->BytesPerClusterMask + Dirent->FileSize) + & ~(Context->BytesPerClusterMask); + //FileName.Buffer = Info->ShortName; + //FileName.MaximumLength = sizeof(Info->ShortName); + // FatQueryShortName(&FileName, Dirent); + // Info->ShortNameLength = (CCHAR) FileName.Length; + Info->NextEntryOffset = sizeof(*Info); + /* + * Associate LFN buffer and length pointers + * of this entry with the context. + */ + Context->NextEntryOffset = &Info->NextEntryOffset; + Context->FileName = Info->FileName; + Context->FileNameLength = &Info->FileNameLength; + return Info->NextEntryOffset; +} + +ULONG +FatDirentToIdFullDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_ID_FULL_DIR_INFORMATION Info; + //UNICODE_STRING FileName; + + Info = (PFILE_ID_FULL_DIR_INFORMATION) Buffer; + /* Setup Attributes */ + Info->FileAttributes = Dirent->Attributes; + /* Setup times */ + FatQueryFileTimes(&Info->CreationTime, Dirent); + /* Setup sizes */ + Info->EndOfFile.QuadPart = Dirent->FileSize; + Info->AllocationSize.QuadPart = + (Context->BytesPerClusterMask + Dirent->FileSize) + & ~(Context->BytesPerClusterMask); + //FileName.Buffer = Info->ShortName; + //FileName.MaximumLength = sizeof(Info->ShortName); + // FatQueryShortName(&FileName, Dirent); + // Info->ShortNameLength = (CCHAR) FileName.Length; + Info->NextEntryOffset = sizeof(*Info); + /* + * Associate LFN buffer and length pointers + * of this entry with the context. + */ + Context->NextEntryOffset = &Info->NextEntryOffset; + Context->FileName = Info->FileName; + Context->FileNameLength = &Info->FileNameLength; + return Info->NextEntryOffset; +} + +ULONG +FatDirentToBothDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_BOTH_DIR_INFORMATION Info; + UNICODE_STRING FileName; + + Info = (PFILE_BOTH_DIR_INFORMATION) Buffer; + /* Setup Attributes */ + Info->FileAttributes = Dirent->Attributes; + /* Setup times */ + FatQueryFileTimes(&Info->CreationTime, Dirent); + /* Setup sizes */ + Info->EndOfFile.QuadPart = Dirent->FileSize; + Info->AllocationSize.QuadPart = + (Context->BytesPerClusterMask + Dirent->FileSize) + & ~(Context->BytesPerClusterMask); + FileName.Buffer = Info->ShortName; + FileName.MaximumLength = sizeof(Info->ShortName); + Fat8dot3ToUnicodeString(&FileName, Dirent->FileName, Dirent->Case); + Info->ShortNameLength = (CCHAR) FileName.Length; + Info->NextEntryOffset = sizeof(*Info); + /* + * Associate LFN buffer and length pointers + * of this entry with the context. + */ + Context->NextEntryOffset = &Info->NextEntryOffset; + Context->FileName = Info->FileName; + Context->FileNameLength = &Info->FileNameLength; + return Info->NextEntryOffset; +} + +ULONG +FatDirentToIdBothDirInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_ID_BOTH_DIR_INFORMATION Info; + UNICODE_STRING FileName; + + Info = (PFILE_ID_BOTH_DIR_INFORMATION) Buffer; + /* Setup Attributes */ + Info->FileAttributes = Dirent->Attributes; + /* Setup times */ + FatQueryFileTimes(&Info->CreationTime, Dirent); + /* Setup sizes */ + Info->EndOfFile.QuadPart = Dirent->FileSize; + Info->AllocationSize.QuadPart = + (Context->BytesPerClusterMask + Dirent->FileSize) + & ~(Context->BytesPerClusterMask); + FileName.Buffer = Info->ShortName; + FileName.MaximumLength = sizeof(Info->ShortName); + Fat8dot3ToUnicodeString(&FileName, Dirent->FileName, Dirent->Case); + Info->ShortNameLength = (CCHAR) FileName.Length; + Info->NextEntryOffset = sizeof(*Info); + /* + * Associate LFN buffer and length pointers + * of this entry with the context. + */ + Context->NextEntryOffset = &Info->NextEntryOffset; + Context->FileName = Info->FileName; + Context->FileNameLength = &Info->FileNameLength; + return Info->NextEntryOffset; +} + +ULONG +FatDirentToNamesInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_NAMES_INFORMATION Info; + + Info = (PFILE_NAMES_INFORMATION) Buffer; +// FatQueryShortName(&FileName, Dirent); + Info->NextEntryOffset = sizeof(*Info); + /* + * Associate LFN buffer and length pointers + * of this entry with the context. + */ + Context->NextEntryOffset = &Info->NextEntryOffset; + Context->FileName = Info->FileName; + Context->FileNameLength = &Info->FileNameLength; + return Info->NextEntryOffset; +} + +ULONG +FatDirentToObjectIdInfo( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN PDIR_ENTRY Dirent, + IN PVOID Buffer) +{ + PFILE_OBJECTID_INFORMATION Info; + + Info = (PFILE_OBJECTID_INFORMATION) Buffer; + return sizeof(*Info); +} + +ULONG +FatEnumerateDirents( + IN OUT PFAT_ENUM_DIR_CONTEXT Context, + IN ULONG Index, + IN BOOLEAN CanWait) +{ + LONGLONG PageOffset; + SIZE_T OffsetWithinPage, PageValidLength; + PUCHAR Entry, BeyoudLastEntry; + /* + * Determine page offset and the offset within page + * for the first cluster. + */ + PageValidLength = PAGE_SIZE; + PageOffset = ((LONGLONG) Index) << BYTES_PER_DIRENT_LOG; + OffsetWithinPage = (SIZE_T) (PageOffset & (PAGE_SIZE - 1)); + PageOffset -= OffsetWithinPage; + /* + * Check if the context already has the required page mapped. + * Map the first page is necessary. + */ + if (PageOffset != Context->PageOffset.QuadPart) + { + Context->PageOffset.QuadPart = PageOffset; + if (Context->PageBcb != NULL) + { + CcUnpinData(Context->PageBcb); + Context->PageBcb = NULL; + } + if (!CcMapData(Context->FileObject, &Context->PageOffset, + PAGE_SIZE, CanWait, &Context->PageBcb, &Context->PageBuffer)) + { + Context->PageOffset.QuadPart = 0LL; + ExRaiseStatus(STATUS_CANT_WAIT); + } + } + Entry = Add2Ptr(Context->PageBuffer, OffsetWithinPage, PUCHAR); + /* + * Next Page Offset. + */ + PageOffset = Context->PageOffset.QuadPart + PAGE_SIZE; + if (PageOffset > Context->BeyoundLastEntryOffset) + PageValidLength = (SIZE_T) (Context->BeyoundLastEntryOffset + - Context->PageOffset.QuadPart); + BeyoudLastEntry = Add2Ptr(Context->PageBuffer, PageValidLength, PUCHAR); + while (TRUE) + { + do + { + if (*Entry == FAT_DIRENT_NEVER_USED) + return 0; // TODO: return something reasonable. + if (*Entry == FAT_DIRENT_DELETED) + { + continue; + } + if (Entry[0x0a] == FAT_DIRENT_ATTR_LFN) + { + PLONG_FILE_NAME_ENTRY Lfnent; + Lfnent = (PLONG_FILE_NAME_ENTRY) Entry; + } + else + { + PDIR_ENTRY Dirent; + Dirent = (PDIR_ENTRY) Entry; + RtlCopyMemory(Context->DirentFileName, + Dirent->FileName, + sizeof(Dirent->FileName)); + } + } + while (++Entry < BeyoudLastEntry); + /* + * Check if this is the last available entry. + */ + if (PageValidLength < PAGE_SIZE) + break; + /* + * We are getting beyound current page and + * are still in the continous run, map the next page. + */ + Context->PageOffset.QuadPart = PageOffset; + CcUnpinData(Context->PageBcb); + if (!CcMapData(Context->FileObject, + &Context->PageOffset, PAGE_SIZE, CanWait, + &Context->PageBcb, &Context->PageBuffer)) + { + Context->PageBcb = NULL; + Context->PageOffset.QuadPart = 0LL; + ExRaiseStatus(STATUS_CANT_WAIT); + } + Entry = (PUCHAR) Context->PageBuffer; + /* + * Next Page Offset. + */ + PageOffset = Context->PageOffset.QuadPart + PAGE_SIZE; + if (PageOffset > Context->BeyoundLastEntryOffset) + PageValidLength = (SIZE_T) (Context->BeyoundLastEntryOffset + - Context->PageOffset.QuadPart); + BeyoudLastEntry = Add2Ptr(Context->PageBuffer, PageValidLength, PUCHAR); + } + return 0; +}
/* EOF */
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