1 files changed, 70 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/crypto/digest-vfs.cpp b/src/VBox/Runtime/common/crypto/digest-vfs.cpp
new file mode 100644
index 00000000..078b9af1
--- /dev/null
+++ b/src/VBox/Runtime/common/crypto/digest-vfs.cpp
@@ -0,0 +1,70 @@
+/* $Id: digest-vfs.cpp $ */
+/** @file
+ * IPRT - Crypto - Cryptographic Hash / Message Digest API, VFS related interfaces
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/iprt.h"
+#include <iprt/crypto/digest.h>
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/vfs.h>
+
+
+RTDECL(int) RTCrDigestUpdateFromVfsFile(RTCRDIGEST hDigest, RTVFSFILE hVfsFile, bool fRewindFile)
+{
+    int rc;
+    if (fRewindFile)
+        rc = RTVfsFileSeek(hVfsFile, 0, RTFILE_SEEK_BEGIN, NULL);
+    else
+        rc = VINF_SUCCESS;
+    if (RT_SUCCESS(rc))
+    {
+        for (;;)
+        {
+            char   abBuf[_16K];
+            size_t cbRead;
+            rc = RTVfsFileRead(hVfsFile, abBuf, sizeof(abBuf), &cbRead);
+            if (RT_SUCCESS(rc))
+            {
+                bool const fEof = rc == VINF_EOF;
+                rc = RTCrDigestUpdate(hDigest, abBuf, cbRead);
+                if (fEof || RT_FAILURE(rc))
+                    break;
+            }
+            else
+            {
+                Assert(rc != VERR_EOF);
+                break;
+            }
+        }
+    }
+    return rc;
+}
+