1 | /* $Id: fileio-sg-generic.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - File I/O, RTFileSgRead & RTFileSgWrite, generic.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * The contents of this file may alternatively be used under the terms
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26 | * of the Common Development and Distribution License Version 1.0
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27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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28 | * in the VirtualBox distribution, in which case the provisions of the
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29 | * CDDL are applicable instead of those of the GPL.
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30 | *
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31 | * You may elect to license modified versions of this file under the
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32 | * terms and conditions of either the GPL or the CDDL or both.
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33 | *
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34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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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 | * Header Files *
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40 | *********************************************************************************************************************************/
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41 | #include "internal/iprt.h"
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42 | #include <iprt/file.h>
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43 |
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44 | #include <iprt/assert.h>
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45 | #include <iprt/err.h>
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46 |
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47 |
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48 | RTDECL(int) RTFileSgRead(RTFILE hFile, PRTSGBUF pSgBuf, size_t cbToRead, size_t *pcbRead)
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49 | {
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50 | int rc = VINF_SUCCESS;
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51 | size_t cbRead = 0;
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52 | while (cbToRead)
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53 | {
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54 | size_t cbBuf = cbToRead;
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55 | void *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
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56 |
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57 | size_t cbThisRead = cbBuf;
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58 | rc = RTFileRead(hFile, pvBuf, cbBuf, pcbRead ? &cbThisRead : NULL);
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59 | if (RT_SUCCESS(rc))
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60 | cbRead += cbThisRead;
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61 | else
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62 | break;
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63 | if (cbThisRead < cbBuf)
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64 | {
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65 | AssertStmt(pcbRead, rc = VERR_INTERNAL_ERROR_2);
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66 | break;
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67 | }
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68 | Assert(cbBuf == cbThisRead);
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69 |
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70 | cbToRead -= cbBuf;
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71 | }
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72 |
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73 | if (pcbRead)
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74 | *pcbRead = cbRead;
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75 |
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76 | return rc;
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77 | }
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78 |
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79 |
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80 | RTDECL(int) RTFileSgWrite(RTFILE hFile, PRTSGBUF pSgBuf, size_t cbToWrite, size_t *pcbWritten)
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81 | {
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82 | int rc = VINF_SUCCESS;
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83 | size_t cbWritten = 0;
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84 | while (cbToWrite)
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85 | {
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86 | size_t cbBuf = cbToWrite;
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87 | void *pvBuf = RTSgBufGetNextSegment(pSgBuf, &cbBuf); /** @todo this is wrong as it may advance the buffer past what's actually read. */
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88 |
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89 | size_t cbThisWritten = cbBuf;
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90 | rc = RTFileWrite(hFile, pvBuf, cbBuf, pcbWritten ? &cbThisWritten : NULL);
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91 | if (RT_SUCCESS(rc))
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92 | cbWritten += cbThisWritten;
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93 | else
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94 | break;
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95 | if (cbThisWritten < cbBuf)
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96 | {
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97 | AssertStmt(pcbWritten, rc = VERR_INTERNAL_ERROR_2);
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98 | break;
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99 | }
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100 |
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101 | Assert(cbBuf == cbThisWritten);
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102 | cbToWrite -= cbBuf;
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103 | }
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104 |
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105 | if (pcbWritten)
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106 | *pcbWritten = cbWritten;
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107 |
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108 | return rc;
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109 | }
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110 |
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