Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

drivers/filesystems/npfs/prefxsup.c

@@ -0,0 +1,93 @@
+/*
+ * PROJECT:     ReactOS Named Pipe FileSystem
+ * LICENSE:     BSD - See COPYING.ARM in the top level directory
+ * FILE:        drivers/filesystems/npfs/prefxsup.c
+ * PURPOSE:     Pipes Prefixes Support
+ * PROGRAMMERS: ReactOS Portable Systems Group
+ */
+
+/* INCLUDES *******************************************************************/
+
+#include "npfs.h"
+
+// File ID number for NPFS bugchecking support
+#define NPFS_BUGCHECK_FILE_ID   (NPFS_BUGCHECK_PREFXSUP)
+
+/* FUNCTIONS ******************************************************************/
+
+PNP_FCB
+NTAPI
+NpFindPrefix(IN PUNICODE_STRING Name,
+             IN ULONG CaseInsensitiveIndex,
+             IN PUNICODE_STRING Prefix)
+{
+    PUNICODE_PREFIX_TABLE_ENTRY Entry;
+    PNP_FCB Fcb;
+    PAGED_CODE();
+
+    Entry = RtlFindUnicodePrefix(&NpVcb->PrefixTable,
+                                 Name,
+                                 CaseInsensitiveIndex);
+    if (!Entry) NpBugCheck(0, 0, 0);
+
+    Fcb = CONTAINING_RECORD(Entry, NP_FCB, PrefixTableEntry);
+
+    Prefix->Length = Name->Length - Fcb->FullName.Length;
+    Prefix->MaximumLength = Prefix->Length;
+    Prefix->Buffer = &Name->Buffer[Fcb->FullName.Length / sizeof(WCHAR)];
+
+    if ((Prefix->Length) && (Prefix->Buffer[0] == OBJ_NAME_PATH_SEPARATOR))
+    {
+        Prefix->Length -= sizeof(WCHAR);
+        Prefix->MaximumLength -= sizeof(WCHAR);
+        ++Prefix->Buffer;
+    }
+
+    return Fcb;
+}
+
+NTSTATUS
+NTAPI
+NpFindRelativePrefix(IN PNP_DCB Dcb,
+                     IN PUNICODE_STRING Name,
+                     IN ULONG CaseInsensitiveIndex,
+                     IN PUNICODE_STRING Prefix,
+                     OUT PNP_FCB *FoundFcb)
+{
+    PWCHAR Buffer;
+    PNP_FCB Fcb;
+    UNICODE_STRING RootName;
+    USHORT Length, MaximumLength;
+    PAGED_CODE();
+
+    Length = Name->Length;
+    MaximumLength = Length + sizeof(OBJ_NAME_PATH_SEPARATOR) + sizeof(UNICODE_NULL);
+    if (MaximumLength < Length) return STATUS_INVALID_PARAMETER;
+
+    ASSERT(Dcb->NodeType == NPFS_NTC_ROOT_DCB);
+
+    Buffer = ExAllocatePoolWithTag(PagedPool, MaximumLength, NPFS_NAME_BLOCK_TAG);
+    if (!Buffer)
+    {
+        return STATUS_INSUFFICIENT_RESOURCES;
+    }
+
+    *Buffer = OBJ_NAME_PATH_SEPARATOR;
+    RtlCopyMemory(Buffer + 1, Name->Buffer, Length);
+    Buffer[(Length / sizeof(WCHAR)) + 1] = UNICODE_NULL;
+
+    RootName.Length = Length + sizeof(OBJ_NAME_PATH_SEPARATOR);
+    RootName.MaximumLength = MaximumLength;
+    RootName.Buffer = Buffer;
+
+    Fcb = NpFindPrefix(&RootName, CaseInsensitiveIndex, Prefix);
+
+    ExFreePool(Buffer);
+
+    Prefix->Buffer = &Name->Buffer[(Length - Prefix->Length) / sizeof(WCHAR)];
+    *FoundFcb = Fcb;
+
+    return STATUS_SUCCESS;
+}
+
+/* EOF */