1 | /* $Id: RTFileReadAllByHandleEx-generic.cpp 48935 2013-10-07 21:19:37Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - RTFileReadAllByHandleEx, generic implementation.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2008-2010 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 <iprt/file.h>
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/mem.h>
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35 | #include <iprt/assert.h>
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36 | #include <iprt/string.h>
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37 | #include <iprt/err.h>
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38 |
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39 |
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40 | RTDECL(int) RTFileReadAllByHandleEx(RTFILE File, RTFOFF off, RTFOFF cbMax, uint32_t fFlags, void **ppvFile, size_t *pcbFile)
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41 | {
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42 | AssertReturn(!(fFlags & ~RTFILE_RDALL_VALID_MASK), VERR_INVALID_PARAMETER);
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43 |
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44 | /*
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45 | * Save the current offset first.
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46 | */
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47 | RTFOFF offOrg;
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48 | int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offOrg);
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49 | if (RT_SUCCESS(rc))
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50 | {
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51 | /*
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52 | * Get the file size, adjust it and check that it might fit into memory.
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53 | */
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54 | RTFOFF cbFile;
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55 | rc = RTFileSeek(File, 0,RTFILE_SEEK_END, (uint64_t *)&cbFile);
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56 | if (RT_SUCCESS(rc))
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57 | {
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58 | RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
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59 | if (cbAllocFile > cbMax)
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60 | cbAllocFile = cbMax;
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61 | size_t cbAllocMem = (size_t)cbAllocFile;
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62 | if ((RTFOFF)cbAllocMem == cbAllocFile)
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63 | {
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64 | /*
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65 | * Try allocate the required memory and initialize the header (hardcoded fun).
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66 | */
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67 | void *pvHdr = RTMemAlloc(cbAllocMem + 32);
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68 | if (pvHdr)
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69 | {
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70 | memset(pvHdr, 0xff, 32);
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71 | *(size_t *)pvHdr = cbAllocMem;
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72 |
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73 | /*
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74 | * Seek and read.
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75 | */
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76 | rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
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77 | if (RT_SUCCESS(rc))
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78 | {
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79 | void *pvFile = (uint8_t *)pvHdr + 32;
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80 | rc = RTFileRead(File, pvFile, cbAllocMem, NULL);
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81 | if (RT_SUCCESS(rc))
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82 | {
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83 | /*
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84 | * Success - fill in the return values.
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85 | */
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86 | *ppvFile = pvFile;
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87 | *pcbFile = cbAllocMem;
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88 | }
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89 | }
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90 |
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91 | if (RT_FAILURE(rc))
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92 | RTMemFree(pvHdr);
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93 | }
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94 | else
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95 | rc = VERR_NO_MEMORY;
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96 | }
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97 | else
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98 | rc = VERR_TOO_MUCH_DATA;
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99 | }
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100 | /* restore the position. */
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101 | RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
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102 | }
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103 | return rc;
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104 | }
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105 | RT_EXPORT_SYMBOL(RTFileReadAllByHandleEx);
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106 |
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