| 1 | /* $Id: RTFileReadAllByHandleEx-generic.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - RTFileReadAllByHandleEx, generic implementation.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2008-2019 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | /*********************************************************************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *********************************************************************************************************************************/
|
|---|
| 31 | #include <iprt/file.h>
|
|---|
| 32 | #include "internal/iprt.h"
|
|---|
| 33 |
|
|---|
| 34 | #include <iprt/mem.h>
|
|---|
| 35 | #include <iprt/assert.h>
|
|---|
| 36 | #include <iprt/string.h>
|
|---|
| 37 | #include <iprt/errcore.h>
|
|---|
| 38 |
|
|---|
| 39 |
|
|---|
| 40 | RTDECL(int) RTFileReadAllByHandleEx(RTFILE File, RTFOFF off, RTFOFF cbMax, uint32_t fFlags, void **ppvFile, size_t *pcbFile)
|
|---|
| 41 | {
|
|---|
| 42 | AssertReturn(!(fFlags & ~RTFILE_RDALL_VALID_MASK), VERR_INVALID_PARAMETER);
|
|---|
| 43 |
|
|---|
| 44 | /*
|
|---|
| 45 | * Save the current offset first.
|
|---|
| 46 | */
|
|---|
| 47 | RTFOFF offOrg;
|
|---|
| 48 | int rc = RTFileSeek(File, 0, RTFILE_SEEK_CURRENT, (uint64_t *)&offOrg);
|
|---|
| 49 | if (RT_SUCCESS(rc))
|
|---|
| 50 | {
|
|---|
| 51 | /*
|
|---|
| 52 | * Get the file size, adjust it and check that it might fit into memory.
|
|---|
| 53 | */
|
|---|
| 54 | RTFOFF cbFile;
|
|---|
| 55 | AssertCompile(sizeof(cbFile) == sizeof(uint64_t));
|
|---|
| 56 | rc = RTFileSeek(File, 0, RTFILE_SEEK_END, (uint64_t *)&cbFile);
|
|---|
| 57 | if (RT_SUCCESS(rc))
|
|---|
| 58 | {
|
|---|
| 59 | RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
|
|---|
| 60 | if (cbAllocFile <= cbMax)
|
|---|
| 61 | { /* likely */ }
|
|---|
| 62 | else if (!(fFlags & RTFILE_RDALL_F_FAIL_ON_MAX_SIZE))
|
|---|
| 63 | cbAllocFile = cbMax;
|
|---|
| 64 | else
|
|---|
| 65 | rc = VERR_OUT_OF_RANGE;
|
|---|
| 66 | if (RT_SUCCESS(rc))
|
|---|
| 67 | {
|
|---|
| 68 | size_t cbAllocMem = (size_t)cbAllocFile;
|
|---|
| 69 | if ((RTFOFF)cbAllocMem == cbAllocFile)
|
|---|
| 70 | {
|
|---|
| 71 | /*
|
|---|
| 72 | * Try allocate the required memory and initialize the header (hardcoded fun).
|
|---|
| 73 | */
|
|---|
| 74 | void *pvHdr = RTMemAlloc(cbAllocMem + 32 + (fFlags & RTFILE_RDALL_F_TRAILING_ZERO_BYTE ? 1 : 0));
|
|---|
| 75 | if (pvHdr)
|
|---|
| 76 | {
|
|---|
| 77 | memset(pvHdr, 0xff, 32);
|
|---|
| 78 | *(size_t *)pvHdr = cbAllocMem;
|
|---|
| 79 |
|
|---|
| 80 | /*
|
|---|
| 81 | * Seek and read.
|
|---|
| 82 | */
|
|---|
| 83 | rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
|
|---|
| 84 | if (RT_SUCCESS(rc))
|
|---|
| 85 | {
|
|---|
| 86 | void *pvFile = (uint8_t *)pvHdr + 32;
|
|---|
| 87 | rc = RTFileRead(File, pvFile, cbAllocMem, NULL);
|
|---|
| 88 | if (RT_SUCCESS(rc))
|
|---|
| 89 | {
|
|---|
| 90 | if (fFlags & RTFILE_RDALL_F_TRAILING_ZERO_BYTE)
|
|---|
| 91 | ((uint8_t *)pvFile)[cbAllocFile] = '\0';
|
|---|
| 92 |
|
|---|
| 93 | /*
|
|---|
| 94 | * Success - fill in the return values.
|
|---|
| 95 | */
|
|---|
| 96 | *ppvFile = pvFile;
|
|---|
| 97 | *pcbFile = cbAllocMem;
|
|---|
| 98 | }
|
|---|
| 99 | }
|
|---|
| 100 |
|
|---|
| 101 | if (RT_FAILURE(rc))
|
|---|
| 102 | RTMemFree(pvHdr);
|
|---|
| 103 | }
|
|---|
| 104 | else
|
|---|
| 105 | rc = VERR_NO_MEMORY;
|
|---|
| 106 | }
|
|---|
| 107 | else
|
|---|
| 108 | rc = VERR_TOO_MUCH_DATA;
|
|---|
| 109 | }
|
|---|
| 110 | }
|
|---|
| 111 | /* restore the position. */
|
|---|
| 112 | RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
|
|---|
| 113 | }
|
|---|
| 114 | return rc;
|
|---|
| 115 | }
|
|---|
| 116 | RT_EXPORT_SYMBOL(RTFileReadAllByHandleEx);
|
|---|
| 117 |
|
|---|
