| 1 | /* $Id: fileio-at-generic.cpp 77209 2019-02-07 23:46:50Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - File I/O, RTFileReadAt and RTFileWriteAt, generic.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2019 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.alldomusa.eu.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/file.h>
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| 33 |
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| 34 | #include <iprt/errcore.h>
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| 35 |
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| 36 |
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| 37 |
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| 38 | /**
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| 39 | * Read bytes from a file at a given offset.
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| 40 | * This function may modify the file position.
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| 41 | *
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| 42 | * @returns iprt status code.
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| 43 | * @param File Handle to the file.
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| 44 | * @param off Where to read.
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| 45 | * @param pvBuf Where to put the bytes we read.
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| 46 | * @param cbToRead How much to read.
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| 47 | * @param *pcbRead How much we actually read.
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| 48 | * If NULL an error will be returned for a partial read.
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| 49 | */
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| 50 | RTDECL(int) RTFileReadAt(RTFILE File, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead)
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| 51 | {
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| 52 | int rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
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| 53 | if (RT_SUCCESS(rc))
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| 54 | rc = RTFileRead(File, pvBuf, cbToRead, pcbRead);
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| 55 | return rc;
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| 56 | }
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| 57 |
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| 58 |
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| 59 | /**
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| 60 | * Write bytes to a file at a given offset.
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| 61 | * This function may modify the file position.
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| 62 | *
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| 63 | * @returns iprt status code.
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| 64 | * @param File Handle to the file.
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| 65 | * @param off Where to write.
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| 66 | * @param pvBuf What to write.
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| 67 | * @param cbToWrite How much to write.
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| 68 | * @param *pcbWritten How much we actually wrote.
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| 69 | * If NULL an error will be returned for a partial write.
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| 70 | */
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| 71 | RTDECL(int) RTFileWriteAt(RTFILE File, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
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| 72 | {
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| 73 | int rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
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| 74 | if (RT_SUCCESS(rc))
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| 75 | rc = RTFileWrite(File, pvBuf, cbToWrite, pcbWritten);
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| 76 | return rc;
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| 77 | }
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| 78 |
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