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/* $Id: RTFileReadAllByHandleEx-generic.cpp $ */
/** @file
* IPRT - RTFileReadAllByHandleEx, generic implementation.
*/
/*
* Copyright (C) 2008-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/file.h>
#include "internal/iprt.h"
#include <iprt/mem.h>
#include <iprt/assert.h>
#include <iprt/string.h>
#include <iprt/errcore.h>
RTDECL(int) RTFileReadAllByHandleEx(RTFILE File, RTFOFF off, RTFOFF cbMax, uint32_t fFlags, void **ppvFile, size_t *pcbFile)
{
AssertReturn(!(fFlags & ~RTFILE_RDALL_VALID_MASK), VERR_INVALID_PARAMETER);
/*
* 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;
AssertCompile(sizeof(cbFile) == sizeof(uint64_t));
rc = RTFileSeek(File, 0, RTFILE_SEEK_END, (uint64_t *)&cbFile);
if (RT_SUCCESS(rc))
{
RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
if (cbAllocFile <= cbMax)
{ /* likely */ }
else if (!(fFlags & RTFILE_RDALL_F_FAIL_ON_MAX_SIZE))
cbAllocFile = cbMax;
else
rc = VERR_OUT_OF_RANGE;
if (RT_SUCCESS(rc))
{
size_t cbAllocMem = (size_t)cbAllocFile;
if ((RTFOFF)cbAllocMem == cbAllocFile)
{
/*
* Try allocate the required memory and initialize the header (hardcoded fun).
*/
void *pvHdr = RTMemAlloc(cbAllocMem + 32 + (fFlags & RTFILE_RDALL_F_TRAILING_ZERO_BYTE ? 1 : 0));
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))
{
if (fFlags & RTFILE_RDALL_F_TRAILING_ZERO_BYTE)
((uint8_t *)pvFile)[cbAllocFile] = '\0';
/*
* Success - fill in the return values.
*/
*ppvFile = pvFile;
*pcbFile = cbAllocMem;
}
}
if (RT_FAILURE(rc))
RTMemFree(pvHdr);
}
else
rc = VERR_NO_MEMORY;
}
else
rc = VERR_TOO_MUCH_DATA;
}
}
/* restore the position. */
RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
}
return rc;
}
RT_EXPORT_SYMBOL(RTFileReadAllByHandleEx);
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