1 files changed, 100 insertions, 0 deletions
diff --git a/src/VBox/Runtime/generic/fileio-sg-generic.cpp b/src/VBox/Runtime/generic/fileio-sg-generic.cpp
new file mode 100644
index 00000000..50d164b6
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+++ b/src/VBox/Runtime/generic/fileio-sg-generic.cpp
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+/* $Id: fileio-sg-generic.cpp $ */
+/** @file
+ * IPRT - File I/O, RTFileSgRead & RTFileSgWrite, generic.
+ */
+
+/*
+ * 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/file.h>
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+
+
+RTDECL(int)  RTFileSgRead(RTFILE hFile, PRTSGBUF pSgBuf, size_t cbToRead, size_t *pcbRead)
+{
+    int rc = VINF_SUCCESS;
+    size_t cbRead = 0;
+    while (cbToRead)
+    {
+        size_t cbBuf = cbToRead;
+        void  *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
+
+        size_t cbThisRead = cbBuf;
+        rc = RTFileRead(hFile, pvBuf, cbBuf, pcbRead ? &cbThisRead : NULL);
+        if (RT_SUCCESS(rc))
+            cbRead += cbThisRead;
+        else
+            break;
+        if (cbThisRead < cbBuf)
+        {
+            AssertStmt(pcbRead, rc = VERR_INTERNAL_ERROR_2);
+            break;
+        }
+        Assert(cbBuf == cbThisRead);
+
+        cbToRead -= cbBuf;
+    }
+
+    if (pcbRead)
+        *pcbRead = cbRead;
+
+    return rc;
+}
+
+
+RTDECL(int)  RTFileSgWrite(RTFILE hFile, PRTSGBUF pSgBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    int rc = VINF_SUCCESS;
+    size_t cbWritten = 0;
+    while (cbToWrite)
+    {
+        size_t cbBuf = cbToWrite;
+        void  *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
+
+        size_t cbThisWritten = cbBuf;
+        rc = RTFileWrite(hFile, pvBuf, cbBuf, pcbWritten ? &cbThisWritten : NULL);
+        if (RT_SUCCESS(rc))
+            cbWritten += cbThisWritten;
+        else
+            break;
+        if (cbThisWritten < cbBuf)
+        {
+            AssertStmt(pcbWritten, rc = VERR_INTERNAL_ERROR_2);
+            break;
+        }
+
+        Assert(cbBuf == cbThisWritten);
+        cbToWrite -= cbBuf;
+    }
+
+    if (pcbWritten)
+        *pcbWritten = cbWritten;
+
+    return rc;
+}
+