/*
* 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;
+
+ 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 );
+ }
+}
/* EOF */
projects / reactos.git / blobdiff