RTFileReadAllByHandleEx-generic.cpp revision 2f474f0bbe679ecae927d546e06f66956a68b84e
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync/* $Id$ */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync/** @file
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * IPRT - RTFileReadAllByHandleEx, generic implementation.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync/*
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Copyright (C) 2008 Sun Microsystems, Inc.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync *
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * available from http://www.virtualbox.org. This file is free software;
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * you can redistribute it and/or modify it under the terms of the GNU
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * General Public License (GPL) as published by the Free Software
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync *
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * The contents of this file may alternatively be used under the terms
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * of the Common Development and Distribution License Version 1.0
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * VirtualBox OSE distribution, in which case the provisions of the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * CDDL are applicable instead of those of the GPL.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync *
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * You may elect to license modified versions of this file under the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * terms and conditions of either the GPL or the CDDL or both.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync *
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * additional information or have any questions.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync/*******************************************************************************
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync* Header Files *
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync*******************************************************************************/
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync#include <iprt/file.h>
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync#include <iprt/mem.h>
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync#include <iprt/assert.h>
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync#include <iprt/string.h>
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync#include <iprt/err.h>
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsyncRTDECL(int) RTFileReadAllByHandleEx(RTFILE File, RTFOFF off, RTFOFF cbMax, uint32_t fFlags, void **ppvFile, size_t *pcbFile)
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync{
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync /*
* Save the current offset first.
*/
RTFOFF offOrg;
int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offOrg);
if (RT_SUCCESS(rc))
{
/*
* Get the file size, adjust it and check that it might fit into memory.
*/
RTFOFF cbFile;
rc = RTFileSeek(File, 0,RTFILE_SEEK_END, (uint64_t *)&cbFile);
if (RT_SUCCESS(rc))
{
RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
if (cbAllocFile > cbMax)
cbAllocFile = cbMax;
size_t cbAllocMem = (size_t)cbAllocFile;
if ( (RTFOFF)cbAllocMem == cbAllocFile
&& cbAllocMem)
{
/*
* Try allocate the required memory and initialize the header (hardcoded fun).
*/
void *pvHdr = RTMemAlloc(cbAllocMem + 32);
if (pvHdr)
{
memset(pvHdr, 0xff, 32);
*(size_t *)pvHdr = cbAllocMem;
/*
* Seek and read.
*/
rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
if (RT_SUCCESS(rc))
{
void *pvFile = (uint8_t *)pvHdr + 32;
rc = RTFileRead(File, pvFile, cbAllocMem, NULL);
if (RT_SUCCESS(rc))
{
/*
* Success - fill in the return values.
*/
*ppvFile = pvFile;
*pcbFile = cbAllocFile;
}
}
if (RT_FAILURE(rc))
RTMemFree(pvHdr);
}
else
rc = VERR_NO_MEMORY;
}
else if (!cbAllocMem)
rc = VERR_EOF;
else
rc = VERR_TOO_MUCH_DATA;
}
/* restore the position. */
RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
}
return rc;
}