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/* $Id: fileio-sg-at-generic.cpp $ */
/** @file
* IPRT - File I/O, RTFileSgReadAt & RTFileSgWriteAt, generic.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* 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;
}
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