| 1 | /* $Id: fileio-sg-at-generic.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - File I/O, RTFileSgReadAt & RTFileSgWriteAt, generic.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2020 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | /*********************************************************************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *********************************************************************************************************************************/
|
|---|
| 31 | #include "internal/iprt.h"
|
|---|
| 32 | #include <iprt/file.h>
|
|---|
| 33 |
|
|---|
| 34 | #include <iprt/assert.h>
|
|---|
| 35 | #include <iprt/err.h>
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | RTDECL(int) RTFileSgReadAt(RTFILE hFile, RTFOFF off, PRTSGBUF pSgBuf, size_t cbToRead, size_t *pcbRead)
|
|---|
| 39 | {
|
|---|
| 40 | int rc = VINF_SUCCESS;
|
|---|
| 41 | size_t cbRead = 0;
|
|---|
| 42 | while (cbToRead)
|
|---|
| 43 | {
|
|---|
| 44 | size_t cbBuf = cbToRead;
|
|---|
| 45 | void *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
|
|---|
| 46 |
|
|---|
| 47 | size_t cbThisRead = cbBuf;
|
|---|
| 48 | rc = RTFileReadAt(hFile, off, pvBuf, cbBuf, pcbRead ? &cbThisRead : NULL);
|
|---|
| 49 | if (RT_SUCCESS(rc))
|
|---|
| 50 | cbRead += cbThisRead;
|
|---|
| 51 | else
|
|---|
| 52 | break;
|
|---|
| 53 | if (cbThisRead < cbBuf)
|
|---|
| 54 | {
|
|---|
| 55 | AssertStmt(pcbRead, rc = VERR_INTERNAL_ERROR_2);
|
|---|
| 56 | break;
|
|---|
| 57 | }
|
|---|
| 58 | Assert(cbBuf == cbThisRead);
|
|---|
| 59 |
|
|---|
| 60 | cbToRead -= cbBuf;
|
|---|
| 61 | off += cbBuf;
|
|---|
| 62 | }
|
|---|
| 63 |
|
|---|
| 64 | if (pcbRead)
|
|---|
| 65 | *pcbRead = cbRead;
|
|---|
| 66 |
|
|---|
| 67 | return rc;
|
|---|
| 68 | }
|
|---|
| 69 |
|
|---|
| 70 |
|
|---|
| 71 | RTDECL(int) RTFileSgWriteAt(RTFILE hFile, RTFOFF off, PRTSGBUF pSgBuf, size_t cbToWrite, size_t *pcbWritten)
|
|---|
| 72 | {
|
|---|
| 73 | int rc = VINF_SUCCESS;
|
|---|
| 74 | size_t cbWritten = 0;
|
|---|
| 75 | while (cbToWrite)
|
|---|
| 76 | {
|
|---|
| 77 | size_t cbBuf = cbToWrite;
|
|---|
| 78 | void *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
|
|---|
| 79 |
|
|---|
| 80 | size_t cbThisWritten = cbBuf;
|
|---|
| 81 | rc = RTFileWriteAt(hFile, off, pvBuf, cbBuf, pcbWritten ? &cbThisWritten : NULL);
|
|---|
| 82 | if (RT_SUCCESS(rc))
|
|---|
| 83 | cbWritten += cbThisWritten;
|
|---|
| 84 | else
|
|---|
| 85 | break;
|
|---|
| 86 | if (cbThisWritten < cbBuf)
|
|---|
| 87 | {
|
|---|
| 88 | AssertStmt(pcbWritten, rc = VERR_INTERNAL_ERROR_2);
|
|---|
| 89 | break;
|
|---|
| 90 | }
|
|---|
| 91 |
|
|---|
| 92 | Assert(cbBuf == cbThisWritten);
|
|---|
| 93 | cbToWrite -= cbBuf;
|
|---|
| 94 | off += cbBuf;
|
|---|
| 95 | }
|
|---|
| 96 |
|
|---|
| 97 | if (pcbWritten)
|
|---|
| 98 | *pcbWritten = cbWritten;
|
|---|
| 99 |
|
|---|
| 100 | return rc;
|
|---|
| 101 | }
|
|---|
| 102 |
|
|---|
