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

sdk/lib/dnslib/flatbuf.c

@@ -0,0 +1,116 @@
+/*
+ * COPYRIGHT:   See COPYING in the top level directory
+ * PROJECT:     ReactOS DNS Shared Library
+ * FILE:        lib/dnslib/flatbuf.c
+ * PURPOSE:     Functions for managing the Flat Buffer Implementation (FLATBUF)
+ */
+
+/* INCLUDES ******************************************************************/
+#include "precomp.h"
+
+/* DATA **********************************************************************/
+
+/* FUNCTIONS *****************************************************************/
+
+VOID
+WINAPI
+FlatBuf_Init(IN PFLATBUFF FlatBuffer,
+             IN PVOID Buffer,
+             IN SIZE_T Size)
+{
+    /* Set up the Flat Buffer start, current and ending position */
+    FlatBuffer->Buffer = Buffer;
+    FlatBuffer->BufferPos = (ULONG_PTR)Buffer;
+    FlatBuffer->BufferEnd = (PVOID)(FlatBuffer->BufferPos + Size);
+
+    /* Setup the current size and the available size */
+    FlatBuffer->BufferSize = FlatBuffer->BufferFreeSize = Size;
+}
+
+PVOID
+WINAPI
+FlatBuf_Arg_Reserve(IN OUT PULONG_PTR Position,
+                    IN OUT PSIZE_T FreeSize,
+                    IN SIZE_T Size,
+                    IN ULONG Align)
+{
+    ULONG_PTR NewPosition, OldPosition = *Position;
+    SIZE_T NewFreeSize = *FreeSize;
+
+    /* Start by aligning our position */
+    if (Align) OldPosition += (Align - 1) & ~Align;
+
+    /* Update it */
+    NewPosition = OldPosition + Size;
+
+    /* Update Free Size */
+    NewFreeSize += (OldPosition - NewPosition);
+
+    /* Save new values */
+    *Position = NewPosition;
+    *FreeSize = NewFreeSize;
+
+    /* Check if we're out of space or not */
+    if (NewFreeSize > 0) return (PVOID)OldPosition;
+    return NULL;
+}
+
+PVOID
+WINAPI
+FlatBuf_Arg_CopyMemory(IN OUT PULONG_PTR Position,
+                       IN OUT PSIZE_T FreeSize,
+                       IN PVOID Buffer,
+                       IN SIZE_T Size,
+                       IN ULONG Align)
+{
+    PVOID Destination;
+
+    /* First reserve the memory */
+    Destination = FlatBuf_Arg_Reserve(Position, FreeSize, Size, Align);
+    if (Destination)
+    {
+        /* We have space, do the copy */
+        RtlCopyMemory(Destination, Buffer, Size);
+    }
+
+    /* Return the pointer to the data */
+    return Destination;
+}
+
+PVOID
+WINAPI
+FlatBuf_Arg_WriteString(IN OUT PULONG_PTR Position,
+                        IN OUT PSIZE_T FreeSize,
+                        IN PVOID String,
+                        IN BOOLEAN IsUnicode)
+{
+    PVOID Destination;
+    SIZE_T StringLength;
+    ULONG Align;
+
+    /* Calculate the string length */
+    if (IsUnicode)
+    {
+        /* Get the length in bytes and use WCHAR alignment */
+        StringLength = (wcslen((LPWSTR)String) + 1) * sizeof(WCHAR);
+        Align = sizeof(WCHAR);
+    }
+    else
+    {
+        /* Get the length in bytes and use CHAR alignment */
+        StringLength = strlen((LPSTR)String) + 1;
+        Align = sizeof(CHAR);
+    }
+
+    /* Now reserve the memory */
+    Destination = FlatBuf_Arg_Reserve(Position, FreeSize, StringLength, Align);
+    if (Destination)
+    {
+        /* We have space, do the copy */
+        RtlCopyMemory(Destination, String, StringLength);
+    }
+
+    /* Return the pointer to the data */
+    return Destination;
+}
+