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-rw-r--r--src/VBox/Runtime/common/crypto/digest-vfs.cpp70
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
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+++ b/src/VBox/Runtime/common/crypto/digest-vfs.cpp
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+/* $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;
+}
+