Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers...

[reactos.git] / drivers / filters / fltmgr / Lib.c

diff --git a/drivers/filters/fltmgr/Lib.c b/drivers/filters/fltmgr/Lib.c
new file mode 100644 (file)
index 0000000..95ca14f
--- /dev/null
+++ b/drivers/filters/fltmgr/Lib.c
@@ -0,0 +1,83 @@
+/*
+* PROJECT:         Filesystem Filter Manager
+* LICENSE:         GPL - See COPYING in the top level directory
+* FILE:            drivers/filters/fltmgr/Lib.c
+* PURPOSE:         Miscellaneous library functions
+* PROGRAMMERS:     Ged Murphy (gedmurphy@reactos.org)
+*/
+
+/* INCLUDES ******************************************************************/
+
+#include "fltmgr.h"
+
+#define NDEBUG
+#include <debug.h>
+
+
+/* DATA *********************************************************************/
+
+
+
+/* FUNCTIONS **********************************************/
+
+VOID
+FltpFreeUnicodeString(_In_ PUNICODE_STRING String)
+{
+    /* Free up any existing buffer */
+    if (String->Buffer)
+    {
+        ExFreePoolWithTag(String->Buffer, FM_TAG_UNICODE_STRING);
+    }
+
+    /* Empty the string */
+    String->Buffer = NULL;
+    String->Length = 0;
+    String->MaximumLength = 0;
+}
+
+NTSTATUS
+FltpReallocateUnicodeString(_In_ PUNICODE_STRING String,
+                            _In_ SIZE_T NewLength,
+                            _In_ BOOLEAN CopyExisting)
+{
+    PWCH NewBuffer;
+
+    /* Don't bother reallocating if the buffer is smaller */
+    if (NewLength <= String->MaximumLength)
+    {
+        String->Length = 0;
+        return STATUS_SUCCESS;
+    }
+
+    /* Allocate a new buffer at the size requested */
+    NewBuffer = ExAllocatePoolWithTag(PagedPool, NewLength, FM_TAG_UNICODE_STRING);
+    if (NewBuffer == NULL) return STATUS_INSUFFICIENT_RESOURCES;
+
+    if (CopyExisting)
+    {
+        /* Copy the old data across */
+        RtlCopyMemory(NewBuffer, String->Buffer, String->Length);
+    }
+    else
+    {
+        /* Reset the length */
+        String->Length = 0;
+    }
+
+    /* Free any old buffer */
+    if (String->Buffer)
+        ExFreePoolWithTag(String->Buffer, FM_TAG_UNICODE_STRING);
+
+    /* Update the lengths */
+    String->Buffer = NewBuffer;
+    String->MaximumLength = NewLength;
+
+    return STATUS_SUCCESS;
+}
+
+NTSTATUS
+FltpCopyUnicodeString(_In_ PUNICODE_STRING StringOne,
+                      _In_ PUNICODE_STRING StringTwo)
+{
+    return 0;
+}