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/* $Id: RTFileCopyPartEx-generic.cpp $ */
/** @file
* IPRT - RTFileCopyPartEx, generic implementation.
*/
/*
* 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 <iprt/file.h>
#include "internal/iprt.h"
#include <iprt/alloca.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/mem.h>
#ifndef IPRT_FALLBACK_VERSION
RTDECL(int) RTFileCopyPartPrep(PRTFILECOPYPARTBUFSTATE pBufState, uint64_t cbToCopy)
#else
static int rtFileCopyPartPrepFallback(PRTFILECOPYPARTBUFSTATE pBufState, uint64_t cbToCopy)
#endif
{
/*
* Allocate a fitting buffer.
*
* We're a little careful with using RTMemPageAlloc here as it does require
* kernel calls on some hosts. If we could be sure the heap was able to
* handle it most of the time, we would be a lot more aggressive.
*/
size_t cbBuf = 0;
void *pvBuf = NULL;
if ( cbToCopy >= _512K
&& (pvBuf = RTMemPageAlloc(cbBuf = _128K)) != NULL)
pBufState->iAllocType = 2;
else if ( cbToCopy >= _128K
&& (pvBuf = RTMemTmpAlloc(cbBuf = _128K)) != NULL)
pBufState->iAllocType = 1;
else if ( cbToCopy < _128K
&& cbToCopy >= _4K
&& (pvBuf = RTMemTmpAlloc(cbBuf = RT_ALIGN_Z(cbToCopy, 32))) != NULL)
pBufState->iAllocType = 1;
else if ( cbToCopy >= _4K
&& (pvBuf = RTMemTmpAlloc(cbBuf = _4K)) != NULL)
pBufState->iAllocType = 1;
else
pBufState->iAllocType = 0;
pBufState->pbBuf = (uint8_t *)pvBuf;
pBufState->cbBuf = cbBuf;
pBufState->uMagic = RTFILECOPYPARTBUFSTATE_MAGIC;
return VINF_SUCCESS;
}
#ifndef IPRT_FALLBACK_VERSION
RTDECL(void) RTFileCopyPartCleanup(PRTFILECOPYPARTBUFSTATE pBufState)
#else
static void rtFileCopyPartCleanupFallback(PRTFILECOPYPARTBUFSTATE pBufState)
#endif
{
AssertReturnVoid(pBufState->uMagic == RTFILECOPYPARTBUFSTATE_MAGIC);
if (pBufState->iAllocType == 1)
RTMemTmpFree(pBufState->pbBuf);
else if (pBufState->iAllocType == 2)
RTMemPageFree(pBufState->pbBuf, pBufState->cbBuf);
pBufState->pbBuf = NULL;
pBufState->cbBuf = 0;
pBufState->uMagic = ~RTFILECOPYPARTBUFSTATE_MAGIC;
}
#ifndef IPRT_FALLBACK_VERSION
RTDECL(int) RTFileCopyPartEx(RTFILE hFileSrc, RTFOFF offSrc, RTFILE hFileDst, RTFOFF offDst, uint64_t cbToCopy,
uint32_t fFlags, PRTFILECOPYPARTBUFSTATE pBufState, uint64_t *pcbCopied)
#else
static int rtFileCopyPartExFallback(RTFILE hFileSrc, RTFOFF offSrc, RTFILE hFileDst, RTFOFF offDst, uint64_t cbToCopy,
uint32_t fFlags, PRTFILECOPYPARTBUFSTATE pBufState, uint64_t *pcbCopied)
#endif
{
/*
* Validate input.
*/
if (pcbCopied)
*pcbCopied = 0;
AssertReturn(offSrc >= 0, VERR_NEGATIVE_SEEK);
AssertReturn(offDst >= 0, VERR_NEGATIVE_SEEK);
AssertReturn(!fFlags, VERR_INVALID_FLAGS);
AssertReturn(pBufState->uMagic == RTFILECOPYPARTBUFSTATE_MAGIC, VERR_INVALID_FLAGS);
/*
* If nothing to copy, return right away.
*/
if (!cbToCopy)
return VINF_SUCCESS;
if (pBufState->iAllocType == 0)
{
pBufState->cbBuf = (size_t)RT_MIN(_4K, cbToCopy);
pBufState->pbBuf = (uint8_t *)alloca(pBufState->cbBuf);
AssertReturn(pBufState->pbBuf, VERR_NO_MEMORY);
}
/*
* Do the copying.
*/
uint64_t cbCopied = 0;
int rc = VINF_SUCCESS;
do
{
size_t cbThisCopy = (size_t)RT_MIN(cbToCopy - cbCopied, pBufState->cbBuf);
size_t cbActual = 0;
rc = RTFileReadAt(hFileSrc, offSrc + cbCopied, pBufState->pbBuf, cbThisCopy, &cbActual);
if (RT_FAILURE(rc))
break;
if (cbActual == 0)
{
if (!pcbCopied)
rc = VERR_EOF;
break;
}
rc = RTFileWriteAt(hFileDst, offDst + cbCopied, pBufState->pbBuf, cbActual, NULL);
if (RT_FAILURE(rc))
break;
cbCopied += cbActual;
} while (cbCopied < cbToCopy);
if (pcbCopied)
*pcbCopied = cbCopied;
return rc;
}
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