+++ /dev/null
-/*
- * FILE: DirEntry.c
- * PURPOSE: Routines to manipulate directory entries.
- * COPYRIGHT: See COPYING in the top level directory
- * PROJECT: ReactOS kernel
- * PROGRAMMER: Jason Filby (jasonfilby@yahoo.com)
- * Rex Jolliff (rex@lvcablemodem.com)
- * Herve Poussineau (reactos@poussine.freesurf.fr)
- */
-
-/* ------------------------------------------------------- INCLUDES */
-
-#include "vfat.h"
-
-#define NDEBUG
-#include <debug.h>
-
-ULONG
-vfatDirEntryGetFirstCluster(
- PDEVICE_EXTENSION pDeviceExt,
- PDIR_ENTRY pFatDirEntry)
-{
- ULONG cluster;
-
- if (pDeviceExt->FatInfo.FatType == FAT32)
- {
- cluster = pFatDirEntry->Fat.FirstCluster |
- (pFatDirEntry->Fat.FirstClusterHigh << 16);
- }
- else if (vfatVolumeIsFatX(pDeviceExt))
- {
- cluster = pFatDirEntry->FatX.FirstCluster;
- }
- else
- {
- cluster = pFatDirEntry->Fat.FirstCluster;
- }
-
- return cluster;
-}
-
-BOOLEAN
-FATIsDirectoryEmpty(
- PVFATFCB Fcb)
-{
- LARGE_INTEGER FileOffset;
- PVOID Context = NULL;
- PFAT_DIR_ENTRY FatDirEntry;
- ULONG Index, MaxIndex;
-
- if (vfatFCBIsRoot(Fcb))
- {
- Index = 0;
- }
- else
- {
- Index = 2;
- }
-
- FileOffset.QuadPart = 0;
- MaxIndex = Fcb->RFCB.FileSize.u.LowPart / sizeof(FAT_DIR_ENTRY);
-
- while (Index < MaxIndex)
- {
- if (Context == NULL || (Index % FAT_ENTRIES_PER_PAGE) == 0)
- {
- if (Context != NULL)
- {
- CcUnpinData(Context);
- }
-
- _SEH2_TRY
- {
- CcMapData(Fcb->FileObject, &FileOffset, sizeof(FAT_DIR_ENTRY), MAP_WAIT, &Context, (PVOID*)&FatDirEntry);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- _SEH2_YIELD(return TRUE);
- }
- _SEH2_END;
-
- FatDirEntry += Index % FAT_ENTRIES_PER_PAGE;
- FileOffset.QuadPart += PAGE_SIZE;
- }
-
- if (FAT_ENTRY_END(FatDirEntry))
- {
- CcUnpinData(Context);
- return TRUE;
- }
-
- if (!FAT_ENTRY_DELETED(FatDirEntry))
- {
- CcUnpinData(Context);
- return FALSE;
- }
-
- Index++;
- FatDirEntry++;
- }
-
- if (Context)
- {
- CcUnpinData(Context);
- }
-
- return TRUE;
-}
-
-BOOLEAN
-FATXIsDirectoryEmpty(
- PVFATFCB Fcb)
-{
- LARGE_INTEGER FileOffset;
- PVOID Context = NULL;
- PFATX_DIR_ENTRY FatXDirEntry;
- ULONG Index = 0, MaxIndex;
-
- FileOffset.QuadPart = 0;
- MaxIndex = Fcb->RFCB.FileSize.u.LowPart / sizeof(FATX_DIR_ENTRY);
-
- while (Index < MaxIndex)
- {
- if (Context == NULL || (Index % FATX_ENTRIES_PER_PAGE) == 0)
- {
- if (Context != NULL)
- {
- CcUnpinData(Context);
- }
-
- _SEH2_TRY
- {
- CcMapData(Fcb->FileObject, &FileOffset, sizeof(FATX_DIR_ENTRY), MAP_WAIT, &Context, (PVOID*)&FatXDirEntry);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- _SEH2_YIELD(return TRUE);
- }
- _SEH2_END;
-
- FatXDirEntry += Index % FATX_ENTRIES_PER_PAGE;
- FileOffset.QuadPart += PAGE_SIZE;
- }
-
- if (FATX_ENTRY_END(FatXDirEntry))
- {
- CcUnpinData(Context);
- return TRUE;
- }
-
- if (!FATX_ENTRY_DELETED(FatXDirEntry))
- {
- CcUnpinData(Context);
- return FALSE;
- }
-
- Index++;
- FatXDirEntry++;
- }
-
- if (Context)
- {
- CcUnpinData(Context);
- }
-
- return TRUE;
-}
-
-NTSTATUS
-FATGetNextDirEntry(
- PVOID *pContext,
- PVOID *pPage,
- IN PVFATFCB pDirFcb,
- PVFAT_DIRENTRY_CONTEXT DirContext,
- BOOLEAN First)
-{
- ULONG dirMap;
- PWCHAR pName;
- LARGE_INTEGER FileOffset;
- PFAT_DIR_ENTRY fatDirEntry;
- slot * longNameEntry;
- ULONG index;
-
- UCHAR CheckSum, shortCheckSum;
- USHORT i;
- BOOLEAN Valid = TRUE;
- BOOLEAN Back = FALSE;
-
- DirContext->LongNameU.Length = 0;
- DirContext->LongNameU.Buffer[0] = UNICODE_NULL;
-
- FileOffset.u.HighPart = 0;
- FileOffset.u.LowPart = ROUND_DOWN(DirContext->DirIndex * sizeof(FAT_DIR_ENTRY), PAGE_SIZE);
-
- if (*pContext == NULL || (DirContext->DirIndex % FAT_ENTRIES_PER_PAGE) == 0)
- {
- if (*pContext != NULL)
- {
- CcUnpinData(*pContext);
- }
-
- if (FileOffset.u.LowPart >= pDirFcb->RFCB.FileSize.u.LowPart)
- {
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- _SEH2_TRY
- {
- CcMapData(pDirFcb->FileObject, &FileOffset, PAGE_SIZE, MAP_WAIT, pContext, pPage);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- *pContext = NULL;
- _SEH2_YIELD(return STATUS_NO_MORE_ENTRIES);
- }
- _SEH2_END;
- }
-
- fatDirEntry = (PFAT_DIR_ENTRY)(*pPage) + DirContext->DirIndex % FAT_ENTRIES_PER_PAGE;
- longNameEntry = (slot*) fatDirEntry;
- dirMap = 0;
-
- if (First)
- {
- /* This is the first call to vfatGetNextDirEntry. Possible the start index points
- * into a long name or points to a short name with an assigned long name.
- * We must go back to the real start of the entry */
- while (DirContext->DirIndex > 0 &&
- !FAT_ENTRY_END(fatDirEntry) &&
- !FAT_ENTRY_DELETED(fatDirEntry) &&
- ((!FAT_ENTRY_LONG(fatDirEntry) && !Back) ||
- (FAT_ENTRY_LONG(fatDirEntry) && !(longNameEntry->id & 0x40))))
- {
- DirContext->DirIndex--;
- Back = TRUE;
-
- if ((DirContext->DirIndex % FAT_ENTRIES_PER_PAGE) == FAT_ENTRIES_PER_PAGE - 1)
- {
- CcUnpinData(*pContext);
- FileOffset.u.LowPart -= PAGE_SIZE;
-
- if (FileOffset.u.LowPart >= pDirFcb->RFCB.FileSize.u.LowPart)
- {
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- _SEH2_TRY
- {
- CcMapData(pDirFcb->FileObject, &FileOffset, PAGE_SIZE, MAP_WAIT, pContext, pPage);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- *pContext = NULL;
- _SEH2_YIELD(return STATUS_NO_MORE_ENTRIES);
- }
- _SEH2_END;
-
- fatDirEntry = (PFAT_DIR_ENTRY)(*pPage) + DirContext->DirIndex % FAT_ENTRIES_PER_PAGE;
- longNameEntry = (slot*) fatDirEntry;
- }
- else
- {
- fatDirEntry--;
- longNameEntry--;
- }
- }
-
- if (Back && !FAT_ENTRY_END(fatDirEntry) &&
- (FAT_ENTRY_DELETED(fatDirEntry) || !FAT_ENTRY_LONG(fatDirEntry)))
- {
- DirContext->DirIndex++;
-
- if ((DirContext->DirIndex % FAT_ENTRIES_PER_PAGE) == 0)
- {
- CcUnpinData(*pContext);
- FileOffset.u.LowPart += PAGE_SIZE;
-
- if (FileOffset.u.LowPart >= pDirFcb->RFCB.FileSize.u.LowPart)
- {
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- _SEH2_TRY
- {
- CcMapData(pDirFcb->FileObject, &FileOffset, PAGE_SIZE, MAP_WAIT, pContext, pPage);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- *pContext = NULL;
- _SEH2_YIELD(return STATUS_NO_MORE_ENTRIES);
- }
- _SEH2_END;
-
- fatDirEntry = (PFAT_DIR_ENTRY)*pPage;
- longNameEntry = (slot*) *pPage;
- }
- else
- {
- fatDirEntry++;
- longNameEntry++;
- }
- }
- }
-
- DirContext->StartIndex = DirContext->DirIndex;
- CheckSum = 0;
-
- while (TRUE)
- {
- if (FAT_ENTRY_END(fatDirEntry))
- {
- CcUnpinData(*pContext);
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- if (FAT_ENTRY_DELETED(fatDirEntry))
- {
- dirMap = 0;
- DirContext->LongNameU.Buffer[0] = 0;
- DirContext->StartIndex = DirContext->DirIndex + 1;
- }
- else
- {
- if (FAT_ENTRY_LONG(fatDirEntry))
- {
- if (dirMap == 0)
- {
- DPRINT (" long name entry found at %u\n", DirContext->DirIndex);
- RtlZeroMemory(DirContext->LongNameU.Buffer, DirContext->LongNameU.MaximumLength);
- CheckSum = longNameEntry->alias_checksum;
- Valid = TRUE;
- }
-
- DPRINT(" name chunk1:[%.*S] chunk2:[%.*S] chunk3:[%.*S]\n",
- 5, longNameEntry->name0_4,
- 6, longNameEntry->name5_10,
- 2, longNameEntry->name11_12);
-
- index = longNameEntry->id & 0x3f; // Note: it can be 0 for corrupted FS
-
- /* Make sure index is valid and we have enough space in buffer
- (we count one char for \0) */
- if (index > 0 &&
- index * 13 < DirContext->LongNameU.MaximumLength / sizeof(WCHAR))
- {
- index--; // make index 0 based
- dirMap |= 1 << index;
-
- pName = DirContext->LongNameU.Buffer + index * 13;
- RtlCopyMemory(pName, longNameEntry->name0_4, 5 * sizeof(WCHAR));
- RtlCopyMemory(pName + 5, longNameEntry->name5_10, 6 * sizeof(WCHAR));
- RtlCopyMemory(pName + 11, longNameEntry->name11_12, 2 * sizeof(WCHAR));
-
- if (longNameEntry->id & 0x40)
- {
- /* It's last LFN entry. Terminate filename with \0 */
- pName[13] = UNICODE_NULL;
- }
- }
- else
- DPRINT1("Long name entry has invalid index: %x!\n", longNameEntry->id);
-
- DPRINT (" longName: [%S]\n", DirContext->LongNameU.Buffer);
-
- if (CheckSum != longNameEntry->alias_checksum)
- {
- DPRINT1("Found wrong alias checksum in long name entry (first %x, current %x, %S)\n",
- CheckSum, longNameEntry->alias_checksum, DirContext->LongNameU.Buffer);
- Valid = FALSE;
- }
- }
- else
- {
- shortCheckSum = 0;
- for (i = 0; i < 11; i++)
- {
- shortCheckSum = (((shortCheckSum & 1) << 7)
- | ((shortCheckSum & 0xfe) >> 1))
- + fatDirEntry->ShortName[i];
- }
-
- if (shortCheckSum != CheckSum && DirContext->LongNameU.Buffer[0])
- {
- DPRINT1("Checksum from long and short name is not equal (short: %x, long: %x, %S)\n",
- shortCheckSum, CheckSum, DirContext->LongNameU.Buffer);
- DirContext->LongNameU.Buffer[0] = 0;
- }
-
- if (Valid == FALSE)
- {
- DirContext->LongNameU.Buffer[0] = 0;
- }
-
- RtlCopyMemory (&DirContext->DirEntry.Fat, fatDirEntry, sizeof (FAT_DIR_ENTRY));
- break;
- }
- }
-
- DirContext->DirIndex++;
-
- if ((DirContext->DirIndex % FAT_ENTRIES_PER_PAGE) == 0)
- {
- CcUnpinData(*pContext);
- FileOffset.u.LowPart += PAGE_SIZE;
-
- if (FileOffset.u.LowPart >= pDirFcb->RFCB.FileSize.u.LowPart)
- {
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- _SEH2_TRY
- {
- CcMapData(pDirFcb->FileObject, &FileOffset, PAGE_SIZE, MAP_WAIT, pContext, pPage);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- *pContext = NULL;
- _SEH2_YIELD(return STATUS_NO_MORE_ENTRIES);
- }
- _SEH2_END;
-
- fatDirEntry = (PFAT_DIR_ENTRY)*pPage;
- longNameEntry = (slot*) *pPage;
- }
- else
- {
- fatDirEntry++;
- longNameEntry++;
- }
- }
-
- /* Make sure filename is NULL terminate and calculate length */
- DirContext->LongNameU.Buffer[DirContext->LongNameU.MaximumLength / sizeof(WCHAR) - 1]
- = UNICODE_NULL;
- DirContext->LongNameU.Length = wcslen(DirContext->LongNameU.Buffer) * sizeof(WCHAR);
-
- /* Init short name */
- vfat8Dot3ToString(&DirContext->DirEntry.Fat, &DirContext->ShortNameU);
-
- /* If we found no LFN, use short name as long */
- if (DirContext->LongNameU.Length == 0)
- RtlCopyUnicodeString(&DirContext->LongNameU, &DirContext->ShortNameU);
-
- return STATUS_SUCCESS;
-}
-
-NTSTATUS
-FATXGetNextDirEntry(
- PVOID *pContext,
- PVOID *pPage,
- IN PVFATFCB pDirFcb,
- PVFAT_DIRENTRY_CONTEXT DirContext,
- BOOLEAN First)
-{
- LARGE_INTEGER FileOffset;
- PFATX_DIR_ENTRY fatxDirEntry;
- OEM_STRING StringO;
- ULONG DirIndex = DirContext->DirIndex;
-
- FileOffset.u.HighPart = 0;
-
- UNREFERENCED_PARAMETER(First);
-
- if (!vfatFCBIsRoot(pDirFcb))
- {
- /* need to add . and .. entries */
- switch (DirContext->DirIndex)
- {
- case 0: /* entry . */
- DirContext->ShortNameU.Buffer[0] = 0;
- DirContext->ShortNameU.Length = 0;
- wcscpy(DirContext->LongNameU.Buffer, L".");
- DirContext->LongNameU.Length = sizeof(WCHAR);
- RtlCopyMemory(&DirContext->DirEntry.FatX, &pDirFcb->entry.FatX, sizeof(FATX_DIR_ENTRY));
- DirContext->DirEntry.FatX.Filename[0] = '.';
- DirContext->DirEntry.FatX.FilenameLength = 1;
- DirContext->StartIndex = 0;
- return STATUS_SUCCESS;
-
- case 1: /* entry .. */
- DirContext->ShortNameU.Buffer[0] = 0;
- DirContext->ShortNameU.Length = 0;
- wcscpy(DirContext->LongNameU.Buffer, L"..");
- DirContext->LongNameU.Length = 2 * sizeof(WCHAR);
- RtlCopyMemory(&DirContext->DirEntry.FatX, &pDirFcb->entry.FatX, sizeof(FATX_DIR_ENTRY));
- DirContext->DirEntry.FatX.Filename[0] = DirContext->DirEntry.FatX.Filename[1] = '.';
- DirContext->DirEntry.FatX.FilenameLength = 2;
- DirContext->StartIndex = 1;
- return STATUS_SUCCESS;
-
- default:
- DirIndex -= 2;
- }
- }
-
- if (*pContext == NULL || (DirIndex % FATX_ENTRIES_PER_PAGE) == 0)
- {
- if (*pContext != NULL)
- {
- CcUnpinData(*pContext);
- }
- FileOffset.u.LowPart = ROUND_DOWN(DirIndex * sizeof(FATX_DIR_ENTRY), PAGE_SIZE);
- if (FileOffset.u.LowPart >= pDirFcb->RFCB.FileSize.u.LowPart)
- {
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- _SEH2_TRY
- {
- CcMapData(pDirFcb->FileObject, &FileOffset, PAGE_SIZE, MAP_WAIT, pContext, pPage);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- *pContext = NULL;
- _SEH2_YIELD(return STATUS_NO_MORE_ENTRIES);
- }
- _SEH2_END;
- }
-
- fatxDirEntry = (PFATX_DIR_ENTRY)(*pPage) + DirIndex % FATX_ENTRIES_PER_PAGE;
-
- DirContext->StartIndex = DirContext->DirIndex;
-
- while (TRUE)
- {
- if (FATX_ENTRY_END(fatxDirEntry))
- {
- CcUnpinData(*pContext);
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- if (!FATX_ENTRY_DELETED(fatxDirEntry))
- {
- RtlCopyMemory(&DirContext->DirEntry.FatX, fatxDirEntry, sizeof(FATX_DIR_ENTRY));
- break;
- }
- DirContext->DirIndex++;
- DirContext->StartIndex++;
- DirIndex++;
- if ((DirIndex % FATX_ENTRIES_PER_PAGE) == 0)
- {
- CcUnpinData(*pContext);
- FileOffset.u.LowPart += PAGE_SIZE;
- if (FileOffset.u.LowPart >= pDirFcb->RFCB.FileSize.u.LowPart)
- {
- *pContext = NULL;
- return STATUS_NO_MORE_ENTRIES;
- }
-
- _SEH2_TRY
- {
- CcMapData(pDirFcb->FileObject, &FileOffset, PAGE_SIZE, MAP_WAIT, pContext, pPage);
- }
- _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
- {
- *pContext = NULL;
- _SEH2_YIELD(return STATUS_NO_MORE_ENTRIES);
- }
- _SEH2_END;
-
- fatxDirEntry = (PFATX_DIR_ENTRY)*pPage;
- }
- else
- {
- fatxDirEntry++;
- }
- }
- DirContext->ShortNameU.Buffer[0] = 0;
- DirContext->ShortNameU.Length = 0;
- StringO.Buffer = (PCHAR)fatxDirEntry->Filename;
- StringO.Length = StringO.MaximumLength = fatxDirEntry->FilenameLength;
- RtlOemStringToUnicodeString(&DirContext->LongNameU, &StringO, FALSE);
- return STATUS_SUCCESS;
-}
projects / reactos.git / blobdiff