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/* $Id: digest-vfs.cpp $ */
/** @file
* IPRT - Crypto - Cryptographic Hash / Message Digest API, VFS related interfaces
*/
/*
* Copyright (C) 2006-2019 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 "internal/iprt.h"
#include <iprt/crypto/digest.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/file.h>
#include <iprt/vfs.h>
RTDECL(int) RTCrDigestUpdateFromVfsFile(RTCRDIGEST hDigest, RTVFSFILE hVfsFile, bool fRewindFile)
{
int rc;
if (fRewindFile)
rc = RTVfsFileSeek(hVfsFile, 0, RTFILE_SEEK_BEGIN, NULL);
else
rc = VINF_SUCCESS;
if (RT_SUCCESS(rc))
{
for (;;)
{
char abBuf[_16K];
size_t cbRead;
rc = RTVfsFileRead(hVfsFile, abBuf, sizeof(abBuf), &cbRead);
if (RT_SUCCESS(rc))
{
bool const fEof = rc == VINF_EOF;
rc = RTCrDigestUpdate(hDigest, abBuf, cbRead);
if (fEof || RT_FAILURE(rc))
break;
}
else
{
Assert(rc != VERR_EOF);
break;
}
}
}
return rc;
}
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