| 1 | /* $Id: RTFileReadAllByHandleEx-generic.cpp 8925 2008-05-19 16:59:11Z 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 Sun Microsystems, Inc.
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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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 |
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| 33 | /*******************************************************************************
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| 34 | * Header Files *
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| 35 | *******************************************************************************/
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| 36 | #include <iprt/file.h>
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| 37 | #include <iprt/mem.h>
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| 38 | #include <iprt/assert.h>
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| 39 | #include <iprt/string.h>
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| 40 | #include <iprt/err.h>
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| 41 |
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| 42 |
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| 43 | RTDECL(int) RTFileReadAllByHandleEx(RTFILE File, RTFOFF off, RTFOFF cbMax, uint32_t fFlags, void **ppvFile, size_t *pcbFile)
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| 44 | {
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| 45 | AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
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| 46 |
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| 47 | /*
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| 48 | * Save the current offset first.
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| 49 | */
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| 50 | RTFOFF offOrg;
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| 51 | int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offOrg);
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| 52 | if (RT_SUCCESS(rc))
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| 53 | {
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| 54 | /*
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| 55 | * Get the file size, adjust it and check that it might fit into memory.
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| 56 | */
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| 57 | RTFOFF cbFile;
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| 58 | rc = RTFileSeek(File, 0,RTFILE_SEEK_END, (uint64_t *)&cbFile);
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| 59 | if (RT_SUCCESS(rc))
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| 60 | {
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| 61 | RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
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| 62 | if (cbAllocFile > cbMax)
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| 63 | cbAllocFile = cbMax;
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| 64 | size_t cbAllocMem = (size_t)cbAllocFile;
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| 65 | if ( (RTFOFF)cbAllocMem == cbAllocFile
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| 66 | && cbAllocMem)
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| 67 | {
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| 68 | /*
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| 69 | * Try allocate the required memory and initialize the header (hardcoded fun).
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| 70 | */
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| 71 | void *pvHdr = RTMemAlloc(cbAllocMem + 32);
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| 72 | if (pvHdr)
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| 73 | {
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| 74 | memset(pvHdr, 0xff, 32);
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| 75 | *(size_t *)pvHdr = cbAllocMem;
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| 76 |
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| 77 | /*
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| 78 | * Seek and read.
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| 79 | */
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| 80 | rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
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| 81 | if (RT_SUCCESS(rc))
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| 82 | {
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| 83 | void *pvFile = (uint8_t *)pvHdr + 32;
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| 84 | rc = RTFileRead(File, pvFile, cbAllocMem, NULL);
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| 85 | if (RT_SUCCESS(rc))
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| 86 | {
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| 87 | /*
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| 88 | * Success - fill in the return values.
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| 89 | */
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| 90 | *ppvFile = pvFile;
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| 91 | *pcbFile = cbAllocFile;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | if (RT_FAILURE(rc))
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| 96 | RTMemFree(pvHdr);
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| 97 | }
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| 98 | else
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| 99 | rc = VERR_NO_MEMORY;
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| 100 | }
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| 101 | else if (!cbAllocMem)
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| 102 | rc = VERR_EOF;
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| 103 | else
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| 104 | rc = VERR_TOO_MUCH_DATA;
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| 105 | }
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| 106 | /* restore the position. */
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| 107 | RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
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| 108 | }
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| 109 | return rc;
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| 110 | }
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| 111 |
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