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 |
|
---|
48 | RTDECL(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 |
|
---|
81 | RTDECL(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 |
|
---|