VirtualBox

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

Last change on this file was 98103, checked in by vboxsync, 16 months 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: 6.5 KB
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1/* $Id: asn1-ut-bitstring-decode.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - ASN.1, BIT STRING Type, Decoding.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include "internal/iprt.h"
42#include <iprt/asn1.h>
43
44#include <iprt/err.h>
45#include <iprt/string.h>
46
47#include <iprt/formats/asn1.h>
48
49
50
51RTDECL(int) RTAsn1BitString_DecodeAsn1Ex(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pThis,
52 const char *pszErrorTag)
53{
54 pThis->cBits = 0;
55 pThis->cMaxBits = cMaxBits;
56 pThis->uBits.pv = NULL;
57 pThis->pEncapsulated = NULL;
58 RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
59
60 int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
61 if (RT_SUCCESS(rc))
62 {
63 rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_BIT_STRING,
64 ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
65 fFlags, pszErrorTag, "BIT STRING");
66 if (RT_SUCCESS(rc))
67 {
68 if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
69 {
70 if ( ( cMaxBits == UINT32_MAX
71 || RT_ALIGN(cMaxBits, 8) / 8 + 1 >= pThis->Asn1Core.cb)
72 && pThis->Asn1Core.cb > 0)
73 {
74 uint8_t cUnusedBits = pThis->Asn1Core.cb > 0 ? *pThis->Asn1Core.uData.pu8 : 0;
75 if (pThis->Asn1Core.cb < 2)
76 {
77 /* Not bits present. */
78 if (cUnusedBits == 0)
79 {
80 pThis->cBits = 0;
81 pThis->uBits.pv = NULL;
82 RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
83 pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
84 pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
85 return VINF_SUCCESS;
86 }
87 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
88 "%s: Bad unused bit count: %#x (cb=%#x)",
89 pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
90 }
91 else if (cUnusedBits < 8)
92 {
93 pThis->cBits = (pThis->Asn1Core.cb - 1) * 8;
94 pThis->cBits -= cUnusedBits;
95 pThis->uBits.pu8 = pThis->Asn1Core.uData.pu8 + 1;
96 if ( !(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
97 || cUnusedBits == 0
98 || !( pThis->uBits.pu8[pThis->Asn1Core.cb - 2] & (((uint8_t)1 << cUnusedBits) - (uint8_t)1) ) )
99 {
100 RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
101 pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
102 pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
103 return VINF_SUCCESS;
104 }
105 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
106 "%s: Unused bits shall be zero in DER/CER mode: last byte=%#x cUnused=%#x",
107 pszErrorTag, pThis->uBits.pu8[pThis->cBits / 8], cUnusedBits);
108 }
109 else
110 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
111 "%s: Bad unused bit count: %#x (cb=%#x)",
112 pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
113 }
114 else
115 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
116 "%s: Size mismatch: cb=%#x, expected %#x (cMaxBits=%#x)",
117 pszErrorTag, pThis->Asn1Core.cb, RT_ALIGN(cMaxBits, 8) / 8 + 1, cMaxBits);
118 }
119 else
120 rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
121 "%s: Constructed BIT STRING not implemented.", pszErrorTag);
122 }
123 }
124 RT_ZERO(*pThis);
125 return rc;
126}
127
128
129RTDECL(int) RTAsn1BitString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BITSTRING pThis, const char *pszErrorTag)
130{
131 return RTAsn1BitString_DecodeAsn1Ex(pCursor, fFlags, UINT32_MAX, pThis, pszErrorTag);
132}
133
134
135/*
136 * Generate code for the associated collection types.
137 */
138#define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-bitstring-template.h"
139#include <iprt/asn1-generator-internal-header.h>
140#include <iprt/asn1-generator-asn1-decoder.h>
141
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