VirtualBox

source: vbox/trunk/src/VBox/Runtime/generic/RTFileReadAllByHandleEx-generic.cpp@ 55585

Last change on this file since 55585 was 48935, checked in by vboxsync, 11 years ago

Runtime: Whitespace and svn:keyword cleanups by scm.

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1/* $Id: RTFileReadAllByHandleEx-generic.cpp 48935 2013-10-07 21:19:37Z vboxsync $ */
2/** @file
3 * IPRT - RTFileReadAllByHandleEx, generic implementation.
4 */
5
6/*
7 * Copyright (C) 2008-2010 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/err.h>
38
39
40RTDECL(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 rc = RTFileSeek(File, 0,RTFILE_SEEK_END, (uint64_t *)&cbFile);
56 if (RT_SUCCESS(rc))
57 {
58 RTFOFF cbAllocFile = cbFile > off ? cbFile - off : 0;
59 if (cbAllocFile > cbMax)
60 cbAllocFile = cbMax;
61 size_t cbAllocMem = (size_t)cbAllocFile;
62 if ((RTFOFF)cbAllocMem == cbAllocFile)
63 {
64 /*
65 * Try allocate the required memory and initialize the header (hardcoded fun).
66 */
67 void *pvHdr = RTMemAlloc(cbAllocMem + 32);
68 if (pvHdr)
69 {
70 memset(pvHdr, 0xff, 32);
71 *(size_t *)pvHdr = cbAllocMem;
72
73 /*
74 * Seek and read.
75 */
76 rc = RTFileSeek(File, off, RTFILE_SEEK_BEGIN, NULL);
77 if (RT_SUCCESS(rc))
78 {
79 void *pvFile = (uint8_t *)pvHdr + 32;
80 rc = RTFileRead(File, pvFile, cbAllocMem, NULL);
81 if (RT_SUCCESS(rc))
82 {
83 /*
84 * Success - fill in the return values.
85 */
86 *ppvFile = pvFile;
87 *pcbFile = cbAllocMem;
88 }
89 }
90
91 if (RT_FAILURE(rc))
92 RTMemFree(pvHdr);
93 }
94 else
95 rc = VERR_NO_MEMORY;
96 }
97 else
98 rc = VERR_TOO_MUCH_DATA;
99 }
100 /* restore the position. */
101 RTFileSeek(File, offOrg, RTFILE_SEEK_BEGIN, NULL);
102 }
103 return rc;
104}
105RT_EXPORT_SYMBOL(RTFileReadAllByHandleEx);
106
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