Integrate xtklib with the kernel

xtoskrnl/rtl/memory.c

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+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/rtl/memory.c
+ * DESCRIPTION:     Memory related routines
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtkmapi.h>
+
+
+/**
+ * This routine copies a block of memory.
+ *
+ * @param Destination
+ *        Supplies a pointer to the buffer where data will be copied to.
+ *
+ * @param Source
+ *        Supplies a pointer to the source buffer that will be copied.
+ *
+ * @param Length
+ *        Specifies the number of bytes to copy.
+ *
+ * @return Returns the destination pointer.
+ *
+ * @since NT 3.5
+ */
+XTAPI
+PVOID
+RtlCopyMemory(IN PVOID Destination,
+              IN PCVOID Source,
+              IN SIZE_T Length)
+{
+    PCHAR DestinationBytes = (PCHAR)Destination;
+    PCHAR SourceBytes = (PCHAR)Source;
+
+    /* Forward buffer copy */
+    while(Length--)
+    {
+        *DestinationBytes++ = *SourceBytes++;
+    }
+
+    /* Return pointer to destination buffer */
+    return Destination;
+}
+
+/**
+ * This routine compares the first bytes of the specified memory buffers.
+ *
+ * @param LeftBuffer
+ *        Supplies a pointer to the first block of memory to compare.
+ *
+ * @param RightBuffer
+ *        Supplies a pointer to the second block of memory to compare.
+ *
+ * @param Length
+ *        Specifies a number of bytes to compare.
+ *
+ * @return A value indicating the relationship between the content of the memory blocks.
+ *         It returns zero (0) if both memory blocks are equal or a value different than
+ *         zero representing which is greater if they do not match.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+SIZE_T
+RtlSameMemory(IN PCVOID LeftBuffer,
+              IN PCVOID RightBuffer,
+              IN SIZE_T Length)
+{
+    CONST UCHAR *Left = (PUCHAR)LeftBuffer;
+    CONST UCHAR *Right = (PUCHAR)RightBuffer;
+
+    /* Check if there is anything to compare */
+    if(Length)
+    {
+        /* Iterate through whole buffer length */
+        while(Length--)
+        {
+            /* Compare bytes from both bufers */
+            if(*Left != *Right)
+            {
+                /* Buffers differ */
+                return (*Left - *Right);
+            }
+
+            /* Advance to next byte */
+            Left++;
+            Right++;
+        }
+    }
+
+    /* Buffers equal */
+    return 0;
+}