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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 14:19:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 14:19:18 +0000
commit4035b1bfb1e5843a539a8b624d21952b756974d1 (patch)
treef1e9cd5bf548cbc57ff2fddfb2b4aa9ae95587e2 /src/VBox/Runtime/generic/fileio-sg-at-generic.cpp
parentInitial commit. (diff)
downloadvirtualbox-upstream.tar.xz
virtualbox-upstream.zip
Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Runtime/generic/fileio-sg-at-generic.cpp')
-rw-r--r--src/VBox/Runtime/generic/fileio-sg-at-generic.cpp102
1 files changed, 102 insertions, 0 deletions
diff --git a/src/VBox/Runtime/generic/fileio-sg-at-generic.cpp b/src/VBox/Runtime/generic/fileio-sg-at-generic.cpp
new file mode 100644
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+++ b/src/VBox/Runtime/generic/fileio-sg-at-generic.cpp
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+/* $Id: fileio-sg-at-generic.cpp $ */
+/** @file
+ * IPRT - File I/O, RTFileSgReadAt & RTFileSgWriteAt, 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) RTFileSgReadAt(RTFILE hFile, RTFOFF off, 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 = RTFileReadAt(hFile, off, 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;
+ off += cbBuf;
+ }
+
+ if (pcbRead)
+ *pcbRead = cbRead;
+
+ return rc;
+}
+
+
+RTDECL(int) RTFileSgWriteAt(RTFILE hFile, RTFOFF off, 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 = RTFileWriteAt(hFile, off, 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;
+ off += cbBuf;
+ }
+
+ if (pcbWritten)
+ *pcbWritten = cbWritten;
+
+ return rc;
+}
+