/*
* PROJECT: ReactOS FAT file system driver
* LICENSE: GPL - See COPYING in the top level directory
- * FILE: drivers/filesystems/fastfat/rw.c
- * PURPOSE: Read/write support
- * PROGRAMMERS:
+ * FILE: drivers/filesystems/fastfat/fcb.c
+ * PURPOSE: FCB manipulation routines.
+ * PROGRAMMERS: Aleksey Bragin <aleksey@reactos.org>
*/
/* INCLUDES *****************************************************************/
#define NDEBUG
#include "fastfat.h"
+#define TAG_FILENAME 'fBnF'
+
/* FUNCTIONS ****************************************************************/
+FSRTL_COMPARISON_RESULT
+NTAPI
+FatiCompareNames(PSTRING NameA,
+ PSTRING NameB)
+{
+ ULONG MinimumLen, i;
+
+ /* Calc the minimum length */
+ MinimumLen = NameA->Length < NameB->Length ? NameA->Length :
+ NameB->Length;
+
+ /* Actually compare them */
+ i = (ULONG)RtlCompareMemory( NameA->Buffer, NameB->Buffer, MinimumLen );
+
+ if (i < MinimumLen)
+ {
+ /* Compare prefixes */
+ if (NameA->Buffer[i] < NameB->Buffer[i])
+ return LessThan;
+ else
+ return GreaterThan;
+ }
+
+ /* Final comparison */
+ if (NameA->Length < NameB->Length)
+ return LessThan;
+ else if (NameA->Length > NameB->Length)
+ return GreaterThan;
+ else
+ return EqualTo;
+}
+
+PFCB
+NTAPI
+FatFindFcb(PFAT_IRP_CONTEXT IrpContext,
+ PRTL_SPLAY_LINKS *RootNode,
+ PSTRING AnsiName,
+ PBOOLEAN IsDosName)
+{
+ PFCB_NAME_LINK Node;
+ FSRTL_COMPARISON_RESULT Comparison;
+ PRTL_SPLAY_LINKS Links;
+
+ Links = *RootNode;
+
+ while (Links)
+ {
+ Node = CONTAINING_RECORD(Links, FCB_NAME_LINK, Links);
+
+ /* Compare the prefix */
+ if (*(PUCHAR)Node->Name.Ansi.Buffer != *(PUCHAR)AnsiName->Buffer)
+ {
+ if (*(PUCHAR)Node->Name.Ansi.Buffer < *(PUCHAR)AnsiName->Buffer)
+ Comparison = LessThan;
+ else
+ Comparison = GreaterThan;
+ }
+ else
+ {
+ /* Perform real comparison */
+ Comparison = FatiCompareNames(&Node->Name.Ansi, AnsiName);
+ }
+
+ /* Do they match? */
+ if (Comparison == GreaterThan)
+ {
+ /* No, it's greater, go to the left child */
+ Links = RtlLeftChild(Links);
+ }
+ else if (Comparison == LessThan)
+ {
+ /* No, it's lesser, go to the right child */
+ Links = RtlRightChild(Links);
+ }
+ else
+ {
+ /* Exact match, balance the tree */
+ *RootNode = RtlSplay(Links);
+
+ /* Save type of the name, if needed */
+ if (IsDosName)
+ *IsDosName = Node->IsDosName;
+
+ /* Return the found fcb */
+ return Node->Fcb;
+ }
+ }
+
+ /* Nothing found */
+ return NULL;
+}
+
+PFCB
+NTAPI
+FatCreateFcb(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PVCB Vcb,
+ IN PFCB ParentDcb,
+ IN FF_FILE *FileHandle)
+{
+ PFCB Fcb;
+
+ /* Allocate it and zero it */
+ Fcb = ExAllocatePoolWithTag(NonPagedPool, sizeof(FCB), TAG_FCB);
+ RtlZeroMemory(Fcb, sizeof(FCB));
+
+ /* Set node types */
+ Fcb->Header.NodeTypeCode = FAT_NTC_FCB;
+ Fcb->Header.NodeByteSize = sizeof(FCB);
+ Fcb->Condition = FcbGood;
+
+ /* Initialize resources */
+ Fcb->Header.Resource = &Fcb->Resource;
+ ExInitializeResourceLite(Fcb->Header.Resource);
+
+ Fcb->Header.PagingIoResource = &Fcb->PagingIoResource;
+ ExInitializeResourceLite(Fcb->Header.PagingIoResource);
+
+ /* Initialize mutexes */
+ Fcb->Header.FastMutex = &Fcb->HeaderMutex;
+ ExInitializeFastMutex(&Fcb->HeaderMutex);
+ FsRtlSetupAdvancedHeader(&Fcb->Header, &Fcb->HeaderMutex);
+
+ /* Insert into parent's DCB list */
+ InsertTailList(&ParentDcb->Dcb.ParentDcbList, &Fcb->ParentDcbLinks);
+
+ /* Set backlinks */
+ Fcb->ParentFcb = ParentDcb;
+ Fcb->Vcb = Vcb;
+
+ /* Set file handle and sizes */
+ Fcb->Header.FileSize.LowPart = FileHandle->Filesize;
+ Fcb->Header.ValidDataLength.LowPart = FileHandle->Filesize;
+ Fcb->FatHandle = FileHandle;
+
+ /* Set names */
+ FatSetFcbNames(IrpContext, Fcb);
+
+ return Fcb;
+}
+
+PCCB
+NTAPI
+FatCreateCcb()
+{
+ PCCB Ccb;
+
+ /* Allocate the CCB and zero it */
+ Ccb = ExAllocatePoolWithTag(NonPagedPool, sizeof(CCB), TAG_CCB);
+ RtlZeroMemory(Ccb, sizeof(CCB));
+
+ /* Set mandatory header */
+ Ccb->NodeTypeCode = FAT_NTC_FCB;
+ Ccb->NodeByteSize = sizeof(CCB);
+
+ return Ccb;
+}
+
+VOID
+NTAPI
+FatSetFullNameInFcb(PFCB Fcb,
+ PUNICODE_STRING Name)
+{
+ PUNICODE_STRING ParentName;
+
+ /* Make sure this FCB's name wasn't already set */
+ ASSERT(Fcb->FullFileName.Buffer == NULL);
+
+ /* First of all, check exact case name */
+ if (Fcb->ExactCaseLongName.Buffer)
+ {
+ ASSERT(Fcb->ExactCaseLongName.Length != 0);
+
+ /* Use exact case name */
+ Name = &Fcb->ExactCaseLongName;
+ }
+
+ /* Treat root dir different */
+ if (FatNodeType(Fcb->ParentFcb) == FAT_NTC_ROOT_DCB)
+ {
+ /* Set lengths */
+ Fcb->FullFileName.MaximumLength = sizeof(WCHAR) + Name->Length;
+ Fcb->FullFileName.Length = Fcb->FullFileName.MaximumLength;
+
+ /* Allocate a buffer */
+ Fcb->FullFileName.Buffer = FsRtlAllocatePoolWithTag(PagedPool,
+ Fcb->FullFileName.Length,
+ TAG_FILENAME);
+
+ /* Prefix with a backslash */
+ Fcb->FullFileName.Buffer[0] = L'\\';
+
+ /* Copy the name here */
+ RtlCopyMemory(&Fcb->FullFileName.Buffer[1],
+ &Name->Buffer[0],
+ Name->Length );
+ }
+ else
+ {
+ ParentName = &Fcb->ParentFcb->FullFileName;
+
+ /* Check if parent's name is set */
+ if (!ParentName->Buffer)
+ return;
+
+ /* Set lengths */
+ Fcb->FullFileName.MaximumLength =
+ ParentName->Length + sizeof(WCHAR) + Name->Length;
+ Fcb->FullFileName.Length = Fcb->FullFileName.MaximumLength;
+
+ /* Allocate a buffer */
+ Fcb->FullFileName.Buffer = FsRtlAllocatePoolWithTag(PagedPool,
+ Fcb->FullFileName.Length,
+ TAG_FILENAME );
+
+ /* Copy parent's name here */
+ RtlCopyMemory(&Fcb->FullFileName.Buffer[0],
+ &ParentName->Buffer[0],
+ ParentName->Length );
+
+ /* Add a backslash */
+ Fcb->FullFileName.Buffer[ParentName->Length / sizeof(WCHAR)] = L'\\';
+
+ /* Copy given name here */
+ RtlCopyMemory(&Fcb->FullFileName.Buffer[(ParentName->Length / sizeof(WCHAR)) + 1],
+ &Name->Buffer[0],
+ Name->Length );
+ }
+}
+
+VOID
+NTAPI
+FatSetFcbNames(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PFCB Fcb)
+{
+ FF_DIRENT DirEnt;
+ FF_ERROR Err;
+ POEM_STRING ShortName;
+ CHAR ShortNameRaw[13];
+ UCHAR EntryBuffer[32];
+ UCHAR NumLFNs;
+ PUNICODE_STRING UnicodeName;
+ OEM_STRING LongNameOem;
+ NTSTATUS Status;
+
+ /* Get the dir entry */
+ Err = FF_GetEntry(Fcb->Vcb->Ioman,
+ Fcb->FatHandle->DirEntry,
+ Fcb->FatHandle->DirCluster,
+ &DirEnt);
+
+ if (Err != FF_ERR_NONE)
+ {
+ DPRINT1("Error %d getting dirent of a file\n", Err);
+ return;
+ }
+
+ /* Read the dirent to fetch the raw short name */
+ FF_FetchEntry(Fcb->Vcb->Ioman,
+ Fcb->FatHandle->DirCluster,
+ Fcb->FatHandle->DirEntry,
+ EntryBuffer);
+ NumLFNs = (UCHAR)(EntryBuffer[0] & ~0x40);
+ RtlCopyMemory(ShortNameRaw, EntryBuffer, 11);
+
+ /* Initialize short name string */
+ ShortName = &Fcb->ShortName.Name.Ansi;
+ ShortName->Buffer = Fcb->ShortNameBuffer;
+ ShortName->Length = 0;
+ ShortName->MaximumLength = sizeof(Fcb->ShortNameBuffer);
+
+ /* Convert raw short name to a proper string */
+ Fati8dot3ToString(ShortNameRaw, FALSE, ShortName);
+
+ /* Add the short name link */
+ FatInsertName(IrpContext, &Fcb->ParentFcb->Dcb.SplayLinksAnsi, &Fcb->ShortName);
+ Fcb->ShortName.Fcb = Fcb;
+
+ /* Get the long file name (if any) */
+ if (NumLFNs > 0)
+ {
+ /* Prepare the oem string */
+ LongNameOem.Buffer = DirEnt.FileName;
+ LongNameOem.MaximumLength = FF_MAX_FILENAME;
+ LongNameOem.Length = strlen(DirEnt.FileName);
+
+ /* Prepare the unicode string */
+ UnicodeName = &Fcb->LongName.Name.String;
+ UnicodeName->Length = (LongNameOem.Length + 1) * sizeof(WCHAR);
+ UnicodeName->MaximumLength = UnicodeName->Length;
+ UnicodeName->Buffer = FsRtlAllocatePool(PagedPool, UnicodeName->Length);
+
+ /* Convert it to unicode */
+ Status = RtlOemStringToUnicodeString(UnicodeName, &LongNameOem, FALSE);
+ if (!NT_SUCCESS(Status))
+ {
+ ASSERT(FALSE);
+ }
+
+ RtlDowncaseUnicodeString(UnicodeName, UnicodeName, FALSE);
+ RtlUpcaseUnicodeString(UnicodeName, UnicodeName, FALSE);
+
+ DPRINT1("Converted long name: %wZ\n", UnicodeName);
+
+ /* Add the long unicode name link */
+ FatInsertName(IrpContext, &Fcb->ParentFcb->Dcb.SplayLinksUnicode, &Fcb->LongName);
+ Fcb->LongName.Fcb = Fcb;
+
+ /* Indicate that this FCB has a unicode long name */
+ SetFlag(Fcb->State, FCB_STATE_HAS_UNICODE_NAME);
+ }
+
+ /* Mark the fact that names were added to splay trees*/
+ SetFlag(Fcb->State, FCB_STATE_HAS_NAMES);
+}
+
+VOID
+NTAPI
+Fati8dot3ToString(IN PCHAR FileName,
+ IN BOOLEAN DownCase,
+ OUT POEM_STRING OutString)
+{
+ ULONG BaseLen, ExtLen;
+ CHAR *cString = OutString->Buffer;
+ ULONG i;
+
+ /* Calc base and ext lens */
+ for (BaseLen = 8; BaseLen > 0; BaseLen--)
+ {
+ if (FileName[BaseLen - 1] != ' ') break;
+ }
+
+ for (ExtLen = 3; ExtLen > 0; ExtLen--)
+ {
+ if (FileName[8 + ExtLen - 1] != ' ') break;
+ }
+
+ /* Process base name */
+ if (BaseLen)
+ {
+ RtlCopyMemory(cString, FileName, BaseLen);
+
+ /* Substitute the e5 thing */
+ if (cString[0] == 0x05) cString[0] = 0xe5;
+
+ /* Downcase if asked to */
+ if (DownCase)
+ {
+ /* Do it manually */
+ for (i = 0; i < BaseLen; i++)
+ {
+ if (cString[i] >= 'A' &&
+ cString[i] <= 'Z')
+ {
+ /* Lowercase it */
+ cString[i] += 'a' - 'A';
+ }
+
+ }
+ }
+ }
+
+ /* Process extension */
+ if (ExtLen)
+ {
+ /* Add the dot */
+ cString[BaseLen] = '.';
+ BaseLen++;
+
+ /* Copy the extension */
+ for (i = 0; i < ExtLen; i++)
+ {
+ cString[BaseLen + i] = FileName[8 + i];
+ }
+
+ /* Lowercase the extension if asked to */
+ if (DownCase)
+ {
+ /* Do it manually */
+ for (i = BaseLen; i < BaseLen + ExtLen; i++)
+ {
+ if (cString[i] >= 'A' &&
+ cString[i] <= 'Z')
+ {
+ /* Lowercase it */
+ cString[i] += 'a' - 'A';
+ }
+ }
+ }
+ }
+
+ /* Set the length */
+ OutString->Length = BaseLen + ExtLen;
+
+ DPRINT1("'%s', len %d\n", OutString->Buffer, OutString->Length);
+}
+
+VOID
+NTAPI
+FatInsertName(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PRTL_SPLAY_LINKS *RootNode,
+ IN PFCB_NAME_LINK Name)
+{
+ PFCB_NAME_LINK NameLink;
+ FSRTL_COMPARISON_RESULT Comparison;
+
+ /* Initialize the splay links */
+ RtlInitializeSplayLinks(&Name->Links);
+
+ /* Is this the first entry? */
+ if (*RootNode == NULL)
+ {
+ /* Yes, become root and return */
+ *RootNode = &Name->Links;
+ return;
+ }
+
+ /* Get the name link */
+ NameLink = CONTAINING_RECORD(*RootNode, FCB_NAME_LINK, Links);
+ while (TRUE)
+ {
+ /* Compare prefixes */
+ Comparison = FatiCompareNames(&NameLink->Name.Ansi, &Name->Name.Ansi);
+
+ /* Check the bad case first */
+ if (Comparison == EqualTo)
+ {
+ /* Must not happen */
+ ASSERT(FALSE);
+ }
+
+ /* Check comparison result */
+ if (Comparison == GreaterThan)
+ {
+ /* Go to the left child */
+ if (!RtlLeftChild(&NameLink->Links))
+ {
+ /* It's absent, insert here and break */
+ RtlInsertAsLeftChild(&NameLink->Links, &NameLink->Links);
+ break;
+ }
+ else
+ {
+ /* It's present, go inside it */
+ NameLink = CONTAINING_RECORD(RtlLeftChild(&NameLink->Links),
+ FCB_NAME_LINK,
+ Links);
+ }
+ }
+ else
+ {
+ /* Go to the right child */
+ if (!RtlRightChild(&NameLink->Links))
+ {
+ /* It's absent, insert here and break */
+ RtlInsertAsRightChild(&NameLink->Links, &Name->Links);
+ break;
+ }
+ else
+ {
+ /* It's present, go inside it */
+ NameLink = CONTAINING_RECORD(RtlRightChild(&NameLink->Links),
+ FCB_NAME_LINK,
+ Links);
+ }
+ }
+ }
+}
+
+VOID
+NTAPI
+FatRemoveNames(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PFCB Fcb)
+{
+ PRTL_SPLAY_LINKS RootNew;
+ PFCB Parent;
+
+ /* Reference the parent for simplicity */
+ Parent = Fcb->ParentFcb;
+
+ /* If this FCB hasn't been added to splay trees - just return */
+ if (!FlagOn( Fcb->State, FCB_STATE_HAS_NAMES ))
+ return;
+
+ /* Delete the short name link */
+ RootNew = RtlDelete(&Fcb->ShortName.Links);
+
+ /* Set the new root */
+ Parent->Dcb.SplayLinksAnsi = RootNew;
+
+ /* Deal with a unicode name if it exists */
+ if (FlagOn( Fcb->State, FCB_STATE_HAS_UNICODE_NAME ))
+ {
+ /* Delete the long unicode name link */
+ RootNew = RtlDelete(&Fcb->LongName.Links);
+
+ /* Set the new root */
+ Parent->Dcb.SplayLinksUnicode = RootNew;
+
+ /* Free the long name string's buffer*/
+ RtlFreeUnicodeString(&Fcb->LongName.Name.String);
+
+ /* Clear the "has unicode name" flag */
+ ClearFlag(Fcb->State, FCB_STATE_HAS_UNICODE_NAME);
+ }
+
+ /* This FCB has no names added to splay trees now */
+ ClearFlag(Fcb->State, FCB_STATE_HAS_NAMES);
+}
+
/* EOF */
projects / reactos.git / blobdiff