VirtualBox

source: vbox/trunk/src/VBox/Runtime/generic/fileio-sg-at-generic.cpp@ 98715

Last change on this file since 98715 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Revision
File size: 3.6 KB
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1/* $Id: fileio-sg-at-generic.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - File I/O, RTFileSgReadAt & RTFileSgWriteAt, generic.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include "internal/iprt.h"
42#include <iprt/file.h>
43
44#include <iprt/assert.h>
45#include <iprt/err.h>
46
47
48RTDECL(int) RTFileSgReadAt(RTFILE hFile, RTFOFF off, PRTSGBUF pSgBuf, size_t cbToRead, size_t *pcbRead)
49{
50 int rc = VINF_SUCCESS;
51 size_t cbRead = 0;
52 while (cbToRead)
53 {
54 size_t cbBuf = cbToRead;
55 void *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
56
57 size_t cbThisRead = cbBuf;
58 rc = RTFileReadAt(hFile, off, pvBuf, cbBuf, pcbRead ? &cbThisRead : NULL);
59 if (RT_SUCCESS(rc))
60 cbRead += cbThisRead;
61 else
62 break;
63 if (cbThisRead < cbBuf)
64 {
65 AssertStmt(pcbRead, rc = VERR_INTERNAL_ERROR_2);
66 break;
67 }
68 Assert(cbBuf == cbThisRead);
69
70 cbToRead -= cbBuf;
71 off += cbBuf;
72 }
73
74 if (pcbRead)
75 *pcbRead = cbRead;
76
77 return rc;
78}
79
80
81RTDECL(int) RTFileSgWriteAt(RTFILE hFile, RTFOFF off, PRTSGBUF pSgBuf, size_t cbToWrite, size_t *pcbWritten)
82{
83 int rc = VINF_SUCCESS;
84 size_t cbWritten = 0;
85 while (cbToWrite)
86 {
87 size_t cbBuf = cbToWrite;
88 void *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
89
90 size_t cbThisWritten = cbBuf;
91 rc = RTFileWriteAt(hFile, off, pvBuf, cbBuf, pcbWritten ? &cbThisWritten : NULL);
92 if (RT_SUCCESS(rc))
93 cbWritten += cbThisWritten;
94 else
95 break;
96 if (cbThisWritten < cbBuf)
97 {
98 AssertStmt(pcbWritten, rc = VERR_INTERNAL_ERROR_2);
99 break;
100 }
101
102 Assert(cbBuf == cbThisWritten);
103 cbToWrite -= cbBuf;
104 off += cbBuf;
105 }
106
107 if (pcbWritten)
108 *pcbWritten = cbWritten;
109
110 return rc;
111}
112
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