1 files changed, 104 insertions, 0 deletions
diff --git a/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c b/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c
new file mode 100644
index 00000000..02cf199d
--- /dev/null
+++ b/src/VBox/Additions/x11/vboxvideo/hgsmimemalloc.c
@@ -0,0 +1,104 @@
+/* $Id: hgsmimemalloc.c $ */
+/*
+ * Copyright (C) 2017-2022 Oracle and/or its affiliates.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Memory allocator
+ * ----------------
+ *
+ * Implementation
+ * --------------
+ *
+ * Since the X.Org driver is single threaded and works using an allocate,
+ * submit and free pattern, we replace the generic allocator with a simple
+ * Boolean.  Need more be said?
+ *
+ * bird> Yes, it's buggy. You never set fAllocated. See HGSMIMAAlloc().
+ */
+
+#include <VBoxVideoIPRT.h>
+#include <HGSMIMemAlloc.h>
+#include <HGSMI.h>
+
+int HGSMIMAInit(HGSMIMADATA *pMA, const HGSMIAREA *pArea,
+                HGSMIOFFSET *paDescriptors, uint32_t cDescriptors, HGSMISIZE cbMaxBlock,
+                const HGSMIENV *pEnv)
+{
+    (void)paDescriptors;
+    (void)cDescriptors;
+    (void)cbMaxBlock;
+    (void)pEnv;
+    if (!(pArea->cbArea < UINT32_C(0x80000000)))
+        return VERR_INVALID_PARAMETER;
+    if (!(pArea->cbArea >= HGSMI_MA_BLOCK_SIZE_MIN))
+        return VERR_INVALID_PARAMETER;
+
+    pMA->area = *pArea;
+    pMA->fAllocated = false;
+    return VINF_SUCCESS;
+}
+
+void HGSMIMAUninit(HGSMIMADATA *pMA)
+{
+    (void)pMA;
+}
+
+static HGSMIOFFSET HGSMIMAPointerToOffset(const HGSMIMADATA *pMA, const void RT_UNTRUSTED_VOLATILE_GUEST *pv)
+{
+    if (HGSMIAreaContainsPointer(&pMA->area, pv))
+        return HGSMIPointerToOffset(&pMA->area, pv);
+
+    AssertFailed();
+    return HGSMIOFFSET_VOID;
+}
+
+static void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAOffsetToPointer(const HGSMIMADATA *pMA, HGSMIOFFSET off)
+{
+    if (HGSMIAreaContainsOffset(&pMA->area, off))
+        return HGSMIOffsetToPointer(&pMA->area, off);
+
+    AssertFailed();
+    return NULL;
+}
+
+void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAAlloc(HGSMIMADATA *pMA, HGSMISIZE cb)
+{
+    (void)cb;
+    if (pMA->fAllocated)
+        return NULL;
+    HGSMIOFFSET off = pMA->area.offBase;
+    return HGSMIMAOffsetToPointer(pMA, off);
+    pMA->fAllocated = true; /** @todo r=bird: Errr. what's this doing *after* the return statement? */
+}
+
+void HGSMIMAFree(HGSMIMADATA *pMA, void RT_UNTRUSTED_VOLATILE_GUEST *pv)
+{
+    HGSMIOFFSET off = HGSMIMAPointerToOffset(pMA, pv);
+    if (off != HGSMIOFFSET_VOID)
+        pMA->fAllocated = false;
+    else
+        AssertFailed();
+}
+