| 1 | /* $Id: digest-vfs.cpp 59620 2016-02-10 00:47:33Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Crypto - Cryptographic Hash / Message Digest API, VFS related interfaces
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2016 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "internal/iprt.h"
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| 32 | #include <iprt/crypto/digest.h>
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/err.h>
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| 36 | #include <iprt/file.h>
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| 37 | #include <iprt/vfs.h>
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| 38 |
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| 39 |
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| 40 | RTDECL(int) RTCrDigestUpdateFromVfsFile(RTCRDIGEST hDigest, RTVFSFILE hVfsFile, bool fRewindFile)
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| 41 | {
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| 42 | int rc;
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| 43 | if (fRewindFile)
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| 44 | rc = RTVfsFileSeek(hVfsFile, 0, RTFILE_SEEK_BEGIN, NULL);
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| 45 | else
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| 46 | rc = VINF_SUCCESS;
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| 47 | if (RT_SUCCESS(rc))
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| 48 | {
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| 49 | for (;;)
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| 50 | {
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| 51 | char abBuf[_16K];
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| 52 | size_t cbRead;
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| 53 | rc = RTVfsFileRead(hVfsFile, abBuf, sizeof(abBuf), &cbRead);
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| 54 | if (RT_SUCCESS(rc))
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| 55 | {
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| 56 | bool const fEof = rc == VINF_EOF;
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| 57 | rc = RTCrDigestUpdate(hDigest, abBuf, cbRead);
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| 58 | if (fEof || RT_FAILURE(rc))
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| 59 | break;
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| 60 | }
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| 61 | else
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| 62 | {
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| 63 | Assert(rc != VERR_EOF);
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| 64 | break;
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| 65 | }
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| 66 | }
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| 67 | }
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| 68 | return rc;
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| 69 | }
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| 70 |
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