VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/asn1/asn1-ut-bitstring-decode.cpp@ 70643

Last change on this file since 70643 was 69111, checked in by vboxsync, 7 years ago

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    /branches/VBox-3.0/src/VBox/Runtime/common/asn1/asn1-basics.cpp58652,​70973
    /branches/VBox-3.2/src/VBox/Runtime/common/asn1/asn1-basics.cpp66309,​66318
    /branches/VBox-4.0/src/VBox/Runtime/common/asn1/asn1-basics.cpp70873
    /branches/VBox-4.1/src/VBox/Runtime/common/asn1/asn1-basics.cpp74233,​78414,​78691,​81841,​82127,​85941,​85944-85947,​85949-85950,​85953,​86701,​86728,​87009
    /branches/VBox-4.2/src/VBox/Runtime/common/asn1/asn1-basics.cpp86229-86230,​86234,​86529,​91503-91504,​91506-91508,​91510,​91514-91515,​91521
    /branches/VBox-4.3/src/VBox/Runtime/common/asn1/asn1-basics.cpp91223
    /branches/VBox-4.3/trunk/src/VBox/Runtime/common/asn1/asn1-basics.cpp91223
    /branches/andy/draganddrop/src/VBox/Runtime/common/asn1/asn1-basics.cpp90781-91268
    /branches/andy/guestctrl20/src/VBox/Runtime/common/asn1/asn1-basics.cpp78916,​78930
    /branches/dsen/gui/src/VBox/Runtime/common/asn1/asn1-basics.cpp79076-79078,​79089,​79109-79110,​79112-79113,​79127-79130,​79134,​79141,​79151,​79155,​79157-79159,​79193,​79197
    /branches/dsen/gui2/src/VBox/Runtime/common/asn1/asn1-basics.cpp79224,​79228,​79233,​79235,​79258,​79262-79263,​79273,​79341,​79345,​79354,​79357,​79387-79388,​79559-79569,​79572-79573,​79578,​79581-79582,​79590-79591,​79598-79599,​79602-79603,​79605-79606,​79632,​79635,​79637,​79644
    /branches/dsen/gui3/src/VBox/Runtime/common/asn1/asn1-basics.cpp79645-79692
File size: 6.2 KB
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1/* $Id: asn1-ut-bitstring-decode.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
2/** @file
3 * IPRT - ASN.1, BIT STRING Type, Decoding.
4 */
5
6/*
7 * Copyright (C) 2006-2017 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 "internal/iprt.h"
32#include <iprt/asn1.h>
33
34#include <iprt/err.h>
35#include <iprt/string.h>
36
37#include <iprt/formats/asn1.h>
38
39
40
41RTDECL(int) RTAsn1BitString_DecodeAsn1Ex(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pThis,
42 const char *pszErrorTag)
43{
44 pThis->cBits = 0;
45 pThis->cMaxBits = cMaxBits;
46 pThis->uBits.pv = NULL;
47 pThis->pEncapsulated = NULL;
48 RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
49
50 int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
51 if (RT_SUCCESS(rc))
52 {
53 rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_BIT_STRING,
54 ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
55 fFlags, pszErrorTag, "BIT STRING");
56 if (RT_SUCCESS(rc))
57 {
58 if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
59 {
60 if ( ( cMaxBits == UINT32_MAX
61 || RT_ALIGN(cMaxBits, 8) / 8 + 1 >= pThis->Asn1Core.cb)
62 && pThis->Asn1Core.cb > 0)
63 {
64 uint8_t cUnusedBits = pThis->Asn1Core.cb > 0 ? *pThis->Asn1Core.uData.pu8 : 0;
65 if (pThis->Asn1Core.cb < 2)
66 {
67 /* Not bits present. */
68 if (cUnusedBits == 0)
69 {
70 pThis->cBits = 0;
71 pThis->uBits.pv = NULL;
72 RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
73 pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
74 pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
75 return VINF_SUCCESS;
76 }
77 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
78 "%s: Bad unused bit count: %#x (cb=%#x)",
79 pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
80 }
81 else if (cUnusedBits < 8)
82 {
83 pThis->cBits = (pThis->Asn1Core.cb - 1) * 8;
84 pThis->cBits -= cUnusedBits;
85 pThis->uBits.pu8 = pThis->Asn1Core.uData.pu8 + 1;
86 if ( !(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
87 || cUnusedBits == 0
88 || !( pThis->uBits.pu8[pThis->Asn1Core.cb - 2] & (((uint8_t)1 << cUnusedBits) - (uint8_t)1) ) )
89 {
90 RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
91 pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
92 pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
93 return VINF_SUCCESS;
94 }
95 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
96 "%s: Unused bits shall be zero in DER/CER mode: last byte=%#x cUnused=%#x",
97 pszErrorTag, pThis->uBits.pu8[pThis->cBits / 8], cUnusedBits);
98 }
99 else
100 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
101 "%s: Bad unused bit count: %#x (cb=%#x)",
102 pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
103 }
104 else
105 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
106 "%s: Size mismatch: cb=%#x, expected %#x (cMaxBits=%#x)",
107 pszErrorTag, pThis->Asn1Core.cb, RT_ALIGN(cMaxBits, 8) / 8 + 1, cMaxBits);
108 }
109 else
110 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
111 "%s: Constructed BIT STRING not implemented.", pszErrorTag);
112 }
113 }
114 RT_ZERO(*pThis);
115 return rc;
116}
117
118
119RTDECL(int) RTAsn1BitString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BITSTRING pThis, const char *pszErrorTag)
120{
121 return RTAsn1BitString_DecodeAsn1Ex(pCursor, fFlags, UINT32_MAX, pThis, pszErrorTag);
122}
123
124
125/*
126 * Generate code for the associated collection types.
127 */
128#define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-bitstring-template.h"
129#include <iprt/asn1-generator-internal-header.h>
130#include <iprt/asn1-generator-asn1-decoder.h>
131
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