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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 14:19:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 14:19:18 +0000 |
commit | 4035b1bfb1e5843a539a8b624d21952b756974d1 (patch) | |
tree | f1e9cd5bf548cbc57ff2fddfb2b4aa9ae95587e2 /src/VBox/Runtime/generic/fileio-sg-at-generic.cpp | |
parent | Initial commit. (diff) | |
download | virtualbox-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.cpp | 102 |
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 index 00000000..ebc32242 --- /dev/null +++ b/src/VBox/Runtime/generic/fileio-sg-at-generic.cpp @@ -0,0 +1,102 @@ +/* $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; +} + |