[51770] | 1 | /* $Id: asn1-cursor.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - ASN.1, Basic Operations.
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| 4 | */
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| 5 |
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| 6 | /*
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[98103] | 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[51770] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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[51770] | 11 | *
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[96407] | 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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[51770] | 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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[96407] | 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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[51770] | 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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[96407] | 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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[51770] | 35 | */
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| 36 |
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[57358] | 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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[51770] | 41 | #include "internal/iprt.h"
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| 42 | #include <iprt/asn1.h>
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| 43 |
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[74657] | 44 | #include <iprt/asm.h>
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[51770] | 45 | #include <iprt/alloca.h>
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| 46 | #include <iprt/err.h>
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| 47 | #include <iprt/string.h>
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| 48 | #include <iprt/ctype.h>
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| 49 |
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| 50 | #include <iprt/formats/asn1.h>
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| 51 |
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| 52 |
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[57358] | 53 | /*********************************************************************************************************************************
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| 54 | * Defined Constants And Macros *
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| 55 | *********************************************************************************************************************************/
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[52533] | 56 | /** @def RTASN1_MAX_NESTING
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| 57 | * The maximum nesting depth we allow. This limit is enforced to avoid running
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| 58 | * out of stack due to malformed ASN.1 input.
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| 59 | *
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| 60 | * For reference, 'RTSignTool verify-exe RTSignTool.exe', requires a value of 15
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[52600] | 61 | * to work without hitting the limit for signatures with simple timestamps, and
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| 62 | * 23 (amd64/rel = ~3KB) for the new microsoft timestamp counter signatures.
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[52533] | 63 | */
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| 64 | #ifdef IN_RING3
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| 65 | # define RTASN1_MAX_NESTING 64
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| 66 | #else
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| 67 | # define RTASN1_MAX_NESTING 32
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| 68 | #endif
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| 69 |
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| 70 |
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[51770] | 71 |
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| 72 | RTDECL(PRTASN1CURSOR) RTAsn1CursorInitPrimary(PRTASN1CURSORPRIMARY pPrimaryCursor, void const *pvFirst, uint32_t cb,
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| 73 | PRTERRINFO pErrInfo, PCRTASN1ALLOCATORVTABLE pAllocator, uint32_t fFlags,
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| 74 | const char *pszErrorTag)
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| 75 | {
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[52533] | 76 | pPrimaryCursor->Cursor.pbCur = (uint8_t const *)pvFirst;
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| 77 | pPrimaryCursor->Cursor.cbLeft = cb;
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[62584] | 78 | pPrimaryCursor->Cursor.fFlags = (uint8_t)fFlags; Assert(fFlags <= UINT8_MAX);
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[52533] | 79 | pPrimaryCursor->Cursor.cDepth = 0;
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| 80 | pPrimaryCursor->Cursor.abReserved[0] = 0;
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[74672] | 81 | pPrimaryCursor->Cursor.abReserved[1] = 0;
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[52533] | 82 | pPrimaryCursor->Cursor.pPrimary = pPrimaryCursor;
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| 83 | pPrimaryCursor->Cursor.pUp = NULL;
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| 84 | pPrimaryCursor->Cursor.pszErrorTag = pszErrorTag;
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| 85 | pPrimaryCursor->pErrInfo = pErrInfo;
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| 86 | pPrimaryCursor->pAllocator = pAllocator;
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[74760] | 87 | pPrimaryCursor->pbFirst = (uint8_t const *)pvFirst;
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[51770] | 88 | return &pPrimaryCursor->Cursor;
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| 89 | }
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| 90 |
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| 91 |
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[52533] | 92 | RTDECL(int) RTAsn1CursorInitSub(PRTASN1CURSOR pParent, uint32_t cb, PRTASN1CURSOR pChild, const char *pszErrorTag)
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[51770] | 93 | {
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[52533] | 94 | AssertReturn(pParent->pPrimary, VERR_ASN1_INTERNAL_ERROR_1);
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| 95 | AssertReturn(pParent->pbCur, VERR_ASN1_INTERNAL_ERROR_2);
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[51770] | 96 |
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[52533] | 97 | pChild->pbCur = pParent->pbCur;
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| 98 | pChild->cbLeft = cb;
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[74657] | 99 | pChild->fFlags = pParent->fFlags & ~RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH;
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[52533] | 100 | pChild->cDepth = pParent->cDepth + 1;
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| 101 | AssertReturn(pChild->cDepth < RTASN1_MAX_NESTING, VERR_ASN1_TOO_DEEPLY_NESTED);
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| 102 | pChild->abReserved[0] = 0;
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[74672] | 103 | pChild->abReserved[1] = 0;
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[52533] | 104 | pChild->pPrimary = pParent->pPrimary;
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| 105 | pChild->pUp = pParent;
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| 106 | pChild->pszErrorTag = pszErrorTag;
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[51770] | 107 |
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[52533] | 108 | AssertReturn(pParent->cbLeft >= cb, VERR_ASN1_INTERNAL_ERROR_3);
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[51770] | 109 | pParent->pbCur += cb;
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| 110 | pParent->cbLeft -= cb;
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| 111 |
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[52533] | 112 | return VINF_SUCCESS;
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[51770] | 113 | }
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| 114 |
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| 115 |
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[52533] | 116 | RTDECL(int) RTAsn1CursorInitSubFromCore(PRTASN1CURSOR pParent, PRTASN1CORE pAsn1Core,
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| 117 | PRTASN1CURSOR pChild, const char *pszErrorTag)
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[51770] | 118 | {
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[52533] | 119 | AssertReturn(pParent->pPrimary, VERR_ASN1_INTERNAL_ERROR_1);
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| 120 | AssertReturn(pParent->pbCur, VERR_ASN1_INTERNAL_ERROR_2);
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[51770] | 121 |
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[52533] | 122 | pChild->pbCur = pAsn1Core->uData.pu8;
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| 123 | pChild->cbLeft = pAsn1Core->cb;
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[74657] | 124 | pChild->fFlags = pParent->fFlags & ~RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH;
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[52533] | 125 | pChild->cDepth = pParent->cDepth + 1;
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| 126 | AssertReturn(pChild->cDepth < RTASN1_MAX_NESTING, VERR_ASN1_TOO_DEEPLY_NESTED);
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| 127 | pChild->abReserved[0] = 0;
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[74672] | 128 | pChild->abReserved[1] = 0;
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[52533] | 129 | pChild->pPrimary = pParent->pPrimary;
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| 130 | pChild->pUp = pParent;
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| 131 | pChild->pszErrorTag = pszErrorTag;
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[51770] | 132 |
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[52533] | 133 | return VINF_SUCCESS;
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[51770] | 134 | }
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| 135 |
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| 136 |
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| 137 | RTDECL(int) RTAsn1CursorSetInfoV(PRTASN1CURSOR pCursor, int rc, const char *pszMsg, va_list va)
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| 138 | {
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| 139 | PRTERRINFO pErrInfo = pCursor->pPrimary->pErrInfo;
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| 140 | if (pErrInfo)
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| 141 | {
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| 142 | /* Format the message. */
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| 143 | RTErrInfoSetV(pErrInfo, rc, pszMsg, va);
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| 144 |
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| 145 | /* Add the prefixes. This isn't the fastest way, but it's the one
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| 146 | which eats the least stack. */
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| 147 | char *pszBuf = pErrInfo->pszMsg;
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| 148 | size_t cbBuf = pErrInfo->cbMsg;
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| 149 | if (pszBuf && cbBuf > 32)
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| 150 | {
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| 151 | size_t cbMove = strlen(pszBuf) + 1;
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| 152 |
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| 153 | /* Make sure there is a ': '. */
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| 154 | bool fFirst = false;
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| 155 | if (pszMsg[0] != '%' || pszMsg[1] != 's' || pszMsg[2] != ':')
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| 156 | {
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| 157 | if (cbMove + 2 < cbBuf)
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| 158 | {
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| 159 | memmove(pszBuf + 2, pszBuf, cbMove);
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| 160 | pszBuf[0] = ':';
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| 161 | pszBuf[1] = ' ';
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| 162 | cbMove += 2;
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| 163 | fFirst = true;
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| 164 | }
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| 165 | }
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| 166 |
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| 167 | /* Add the prefixes from the cursor chain. */
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| 168 | while (pCursor)
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| 169 | {
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| 170 | if (pCursor->pszErrorTag)
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| 171 | {
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| 172 | size_t cchErrorTag = strlen(pCursor->pszErrorTag);
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| 173 | if (cchErrorTag + !fFirst + cbMove > cbBuf)
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| 174 | break;
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| 175 | memmove(pszBuf + cchErrorTag + !fFirst, pszBuf, cbMove);
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| 176 | memcpy(pszBuf, pCursor->pszErrorTag, cchErrorTag);
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| 177 | if (!fFirst)
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| 178 | pszBuf[cchErrorTag] = '.';
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| 179 | cbMove += cchErrorTag + !fFirst;
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| 180 | fFirst = false;
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| 181 | }
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| 182 | pCursor = pCursor->pUp;
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| 183 | }
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| 184 | }
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| 185 | }
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| 186 |
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| 187 | return rc;
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| 188 | }
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| 189 |
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| 190 |
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| 191 | RTDECL(int) RTAsn1CursorSetInfo(PRTASN1CURSOR pCursor, int rc, const char *pszMsg, ...)
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| 192 | {
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| 193 | va_list va;
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| 194 | va_start(va, pszMsg);
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| 195 | rc = RTAsn1CursorSetInfoV(pCursor, rc, pszMsg, va);
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| 196 | va_end(va);
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| 197 | return rc;
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| 198 | }
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| 199 |
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| 200 |
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[73662] | 201 | RTDECL(bool) RTAsn1CursorIsEnd(PRTASN1CURSOR pCursor)
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| 202 | {
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[74657] | 203 | if (pCursor->cbLeft == 0)
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| 204 | return true;
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| 205 | if (!(pCursor->fFlags & RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH))
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| 206 | return false;
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[74672] | 207 | return pCursor->cbLeft >= 2
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| 208 | && pCursor->pbCur[0] == 0
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| 209 | && pCursor->pbCur[1] == 0;
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[73662] | 210 | }
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| 211 |
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| 212 |
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[51770] | 213 | RTDECL(int) RTAsn1CursorCheckEnd(PRTASN1CURSOR pCursor)
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| 214 | {
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[74762] | 215 | if (!(pCursor->fFlags & RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH))
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| 216 | {
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| 217 | if (pCursor->cbLeft == 0)
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| 218 | return VINF_SUCCESS;
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| 219 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END,
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| 220 | "%u (%#x) bytes left over", pCursor->cbLeft, pCursor->cbLeft);
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| 221 | }
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[74672] | 222 |
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[74762] | 223 | /*
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| 224 | * There must be exactly two zero bytes here.
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| 225 | */
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| 226 | if (pCursor->cbLeft == 2)
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[74672] | 227 | {
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[74762] | 228 | if ( pCursor->pbCur[0] == 0
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| 229 | && pCursor->pbCur[1] == 0)
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| 230 | return VINF_SUCCESS;
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[74672] | 231 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END,
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[74762] | 232 | "%u (%#x) bytes left over [indef: %.*Rhxs]",
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| 233 | pCursor->cbLeft, pCursor->cbLeft, RT_MIN(pCursor->cbLeft, 16), pCursor->pbCur);
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[74672] | 234 | }
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| 235 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END,
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[74762] | 236 | "%u (%#x) byte(s) left over, exepcted exactly two zero bytes [indef len]",
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| 237 | pCursor->cbLeft, pCursor->cbLeft);
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[74672] | 238 | }
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| 239 |
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| 240 |
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| 241 | /**
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| 242 | * Worker for RTAsn1CursorCheckSeqEnd and RTAsn1CursorCheckSetEnd.
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| 243 | */
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| 244 | static int rtAsn1CursorCheckSeqOrSetEnd(PRTASN1CURSOR pCursor, PRTASN1CORE pAsn1Core)
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| 245 | {
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[74760] | 246 | if (!(pAsn1Core->fFlags & RTASN1CORE_F_INDEFINITE_LENGTH))
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| 247 | {
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| 248 | if (pCursor->cbLeft == 0)
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| 249 | return VINF_SUCCESS;
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| 250 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END,
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| 251 | "%u (%#x) bytes left over", pCursor->cbLeft, pCursor->cbLeft);
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| 252 | }
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[74672] | 253 |
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[74760] | 254 | if (pCursor->cbLeft >= 2)
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[74672] | 255 | {
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[74760] | 256 | if ( pCursor->pbCur[0] == 0
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| 257 | && pCursor->pbCur[1] == 0)
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[74672] | 258 | {
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[74760] | 259 | pAsn1Core->cb = (uint32_t)(pCursor->pbCur - pAsn1Core->uData.pu8);
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| 260 | pCursor->cbLeft -= 2;
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| 261 | pCursor->pbCur += 2;
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| 262 |
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| 263 | PRTASN1CURSOR pParentCursor = pCursor->pUp;
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| 264 | if ( pParentCursor
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| 265 | && (pParentCursor->fFlags & RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH))
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[74672] | 266 | {
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[74760] | 267 | pParentCursor->pbCur -= pCursor->cbLeft;
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| 268 | pParentCursor->cbLeft += pCursor->cbLeft;
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| 269 | return VINF_SUCCESS;
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| 270 | }
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[74672] | 271 |
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[74760] | 272 | if (pCursor->cbLeft == 0)
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| 273 | return VINF_SUCCESS;
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[74672] | 274 |
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[74760] | 275 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END,
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| 276 | "%u (%#x) bytes left over (parent not indefinite length)", pCursor->cbLeft, pCursor->cbLeft);
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[74672] | 277 | }
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[74760] | 278 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END, "%u (%#x) bytes left over [indef: %.*Rhxs]",
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| 279 | pCursor->cbLeft, pCursor->cbLeft, RT_MIN(pCursor->cbLeft, 16), pCursor->pbCur);
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[74672] | 280 | }
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[51770] | 281 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NOT_AT_END,
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[74760] | 282 | "1 byte left over, expected two for indefinite length end-of-content sequence");
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[51770] | 283 | }
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| 284 |
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| 285 |
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[74672] | 286 | RTDECL(int) RTAsn1CursorCheckSeqEnd(PRTASN1CURSOR pCursor, PRTASN1SEQUENCECORE pSeqCore)
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| 287 | {
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| 288 | return rtAsn1CursorCheckSeqOrSetEnd(pCursor, &pSeqCore->Asn1Core);
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| 289 | }
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| 290 |
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| 291 |
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| 292 | RTDECL(int) RTAsn1CursorCheckSetEnd(PRTASN1CURSOR pCursor, PRTASN1SETCORE pSetCore)
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| 293 | {
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| 294 | return rtAsn1CursorCheckSeqOrSetEnd(pCursor, &pSetCore->Asn1Core);
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| 295 | }
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| 296 |
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| 297 |
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[74760] | 298 | RTDECL(int) RTAsn1CursorCheckOctStrEnd(PRTASN1CURSOR pCursor, PRTASN1OCTETSTRING pOctetString)
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| 299 | {
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| 300 | return rtAsn1CursorCheckSeqOrSetEnd(pCursor, &pOctetString->Asn1Core);
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| 301 | }
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| 302 |
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| 303 |
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[51770] | 304 | RTDECL(PRTASN1ALLOCATION) RTAsn1CursorInitAllocation(PRTASN1CURSOR pCursor, PRTASN1ALLOCATION pAllocation)
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| 305 | {
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| 306 | pAllocation->cbAllocated = 0;
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| 307 | pAllocation->cReallocs = 0;
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| 308 | pAllocation->uReserved0 = 0;
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| 309 | pAllocation->pAllocator = pCursor->pPrimary->pAllocator;
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| 310 | return pAllocation;
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| 311 | }
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| 312 |
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| 313 |
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[64883] | 314 | RTDECL(PRTASN1ARRAYALLOCATION) RTAsn1CursorInitArrayAllocation(PRTASN1CURSOR pCursor, PRTASN1ARRAYALLOCATION pAllocation,
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| 315 | size_t cbEntry)
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| 316 | {
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| 317 | Assert(cbEntry >= sizeof(RTASN1CORE));
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| 318 | Assert(cbEntry < _1M);
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| 319 | Assert(RT_ALIGN_Z(cbEntry, sizeof(void *)) == cbEntry);
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| 320 | pAllocation->cbEntry = (uint32_t)cbEntry;
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| 321 | pAllocation->cPointersAllocated = 0;
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| 322 | pAllocation->cEntriesAllocated = 0;
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| 323 | pAllocation->cResizeCalls = 0;
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| 324 | pAllocation->uReserved0 = 0;
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| 325 | pAllocation->pAllocator = pCursor->pPrimary->pAllocator;
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| 326 | return pAllocation;
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| 327 | }
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| 328 |
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| 329 |
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[51770] | 330 | RTDECL(int) RTAsn1CursorReadHdr(PRTASN1CURSOR pCursor, PRTASN1CORE pAsn1Core, const char *pszErrorTag)
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| 331 | {
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| 332 | /*
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| 333 | * Initialize the return structure in case of failure.
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| 334 | */
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| 335 | pAsn1Core->uTag = 0;
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| 336 | pAsn1Core->fClass = 0;
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| 337 | pAsn1Core->uRealTag = 0;
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| 338 | pAsn1Core->fRealClass = 0;
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| 339 | pAsn1Core->cbHdr = 0;
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| 340 | pAsn1Core->cb = 0;
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| 341 | pAsn1Core->fFlags = 0;
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| 342 | pAsn1Core->uData.pv = NULL;
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| 343 | pAsn1Core->pOps = NULL;
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| 344 |
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| 345 | /*
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| 346 | * The header has at least two bytes: Type & length.
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| 347 | */
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| 348 | if (pCursor->cbLeft >= 2)
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| 349 | {
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| 350 | uint32_t uTag = pCursor->pbCur[0];
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| 351 | uint32_t cb = pCursor->pbCur[1];
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| 352 | pCursor->cbLeft -= 2;
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| 353 | pCursor->pbCur += 2;
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| 354 |
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| 355 | pAsn1Core->uRealTag = pAsn1Core->uTag = uTag & ASN1_TAG_MASK;
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| 356 | pAsn1Core->fRealClass = pAsn1Core->fClass = uTag & ~ASN1_TAG_MASK;
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| 357 | pAsn1Core->cbHdr = 2;
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| 358 | if ((uTag & ASN1_TAG_MASK) == ASN1_TAG_USE_LONG_FORM)
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| 359 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_LONG_TAG,
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| 360 | "%s: Implement parsing of tags > 30: %#x (length=%#x)", pszErrorTag, uTag, cb);
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| 361 |
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| 362 | /* Extended length field? */
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| 363 | if (cb & RT_BIT(7))
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| 364 | {
|
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| 365 | if (cb != RT_BIT(7))
|
---|
| 366 | {
|
---|
| 367 | /* Definite form. */
|
---|
| 368 | uint8_t cbEnc = cb & 0x7f;
|
---|
| 369 | if (cbEnc > pCursor->cbLeft)
|
---|
| 370 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_LENGTH_ENCODING,
|
---|
| 371 | "%s: Extended BER length field longer than available data: %#x vs %#x (uTag=%#x)",
|
---|
| 372 | pszErrorTag, cbEnc, pCursor->cbLeft, uTag);
|
---|
| 373 | switch (cbEnc)
|
---|
| 374 | {
|
---|
| 375 | case 1:
|
---|
| 376 | cb = pCursor->pbCur[0];
|
---|
| 377 | break;
|
---|
| 378 | case 2:
|
---|
| 379 | cb = RT_MAKE_U16(pCursor->pbCur[1], pCursor->pbCur[0]);
|
---|
| 380 | break;
|
---|
| 381 | case 3:
|
---|
| 382 | cb = RT_MAKE_U32_FROM_U8(pCursor->pbCur[2], pCursor->pbCur[1], pCursor->pbCur[0], 0);
|
---|
| 383 | break;
|
---|
| 384 | case 4:
|
---|
| 385 | cb = RT_MAKE_U32_FROM_U8(pCursor->pbCur[3], pCursor->pbCur[2], pCursor->pbCur[1], pCursor->pbCur[0]);
|
---|
| 386 | break;
|
---|
| 387 | default:
|
---|
| 388 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_LENGTH_ENCODING,
|
---|
| 389 | "%s: Too long/short extended BER length field: %#x (uTag=%#x)",
|
---|
| 390 | pszErrorTag, cbEnc, uTag);
|
---|
| 391 | }
|
---|
| 392 | pCursor->cbLeft -= cbEnc;
|
---|
| 393 | pCursor->pbCur += cbEnc;
|
---|
| 394 | pAsn1Core->cbHdr += cbEnc;
|
---|
| 395 |
|
---|
| 396 | /* Check the length encoding efficiency (T-REC-X.690-200811 10.1, 9.1). */
|
---|
| 397 | if (pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
|
---|
| 398 | {
|
---|
| 399 | if (cb <= 0x7f)
|
---|
| 400 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_LENGTH_ENCODING,
|
---|
| 401 | "%s: Invalid DER/CER length encoding: cbEnc=%u cb=%#x uTag=%#x",
|
---|
| 402 | pszErrorTag, cbEnc, cb, uTag);
|
---|
| 403 | uint8_t cbNeeded;
|
---|
| 404 | if (cb <= 0x000000ff) cbNeeded = 1;
|
---|
| 405 | else if (cb <= 0x0000ffff) cbNeeded = 2;
|
---|
| 406 | else if (cb <= 0x00ffffff) cbNeeded = 3;
|
---|
| 407 | else cbNeeded = 4;
|
---|
| 408 | if (cbNeeded != cbEnc)
|
---|
| 409 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_LENGTH_ENCODING,
|
---|
| 410 | "%s: Invalid DER/CER length encoding: cb=%#x uTag=%#x cbEnc=%u cbNeeded=%u",
|
---|
| 411 | pszErrorTag, cb, uTag, cbEnc, cbNeeded);
|
---|
| 412 | }
|
---|
| 413 | }
|
---|
| 414 | /* Indefinite form. */
|
---|
| 415 | else if (pCursor->fFlags & RTASN1CURSOR_FLAGS_DER)
|
---|
[74656] | 416 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_ILLEGAL_INDEFINITE_LENGTH,
|
---|
[51770] | 417 | "%s: Indefinite length form not allowed in DER mode (uTag=%#x).", pszErrorTag, uTag);
|
---|
[74657] | 418 | else if (!(uTag & ASN1_TAGFLAG_CONSTRUCTED))
|
---|
| 419 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_INDEFINITE_LENGTH,
|
---|
| 420 | "%s: Indefinite BER/CER encoding is for non-constructed tag (uTag=%#x)", pszErrorTag, uTag);
|
---|
| 421 | else if ( uTag != (ASN1_TAG_SEQUENCE | ASN1_TAGFLAG_CONSTRUCTED)
|
---|
| 422 | && uTag != (ASN1_TAG_SET | ASN1_TAGFLAG_CONSTRUCTED)
|
---|
| 423 | && (uTag & (ASN1_TAGFLAG_CONSTRUCTED | ASN1_TAGCLASS_CONTEXT))
|
---|
| 424 | != (ASN1_TAGFLAG_CONSTRUCTED | ASN1_TAGCLASS_CONTEXT) )
|
---|
| 425 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_INDEFINITE_LENGTH,
|
---|
| 426 | "%s: Indefinite BER/CER encoding not supported for this tag (uTag=%#x)", pszErrorTag, uTag);
|
---|
[74672] | 427 | else if (pCursor->fFlags & RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH)
|
---|
[74657] | 428 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_INDEFINITE_LENGTH,
|
---|
[74672] | 429 | "%s: Nested indefinite BER/CER encoding. (uTag=%#x)", pszErrorTag, uTag);
|
---|
[74656] | 430 | else if (pCursor->cbLeft < 2)
|
---|
| 431 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_INDEFINITE_LENGTH,
|
---|
| 432 | "%s: Too little data left for indefinite BER/CER encoding (uTag=%#x)", pszErrorTag, uTag);
|
---|
[51770] | 433 | else
|
---|
[74656] | 434 | {
|
---|
[74657] | 435 | pCursor->fFlags |= RTASN1CURSOR_FLAGS_INDEFINITE_LENGTH;
|
---|
| 436 | pAsn1Core->fFlags |= RTASN1CORE_F_INDEFINITE_LENGTH;
|
---|
[74760] | 437 | cb = pCursor->cbLeft; /* Start out with the whole sequence, adjusted later upon reach the end. */
|
---|
[74656] | 438 | }
|
---|
[51770] | 439 | }
|
---|
[74672] | 440 | /* else if (cb == 0 && uTag == 0) { end of content } - callers handle this */
|
---|
[51770] | 441 |
|
---|
| 442 | /* Check if the length makes sense. */
|
---|
| 443 | if (cb > pCursor->cbLeft)
|
---|
| 444 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_BAD_LENGTH,
|
---|
| 445 | "%s: BER value length out of bounds: %#x (max=%#x uTag=%#x)",
|
---|
| 446 | pszErrorTag, cb, pCursor->cbLeft, uTag);
|
---|
| 447 |
|
---|
| 448 | pAsn1Core->fFlags |= RTASN1CORE_F_PRESENT | RTASN1CORE_F_DECODED_CONTENT;
|
---|
| 449 | pAsn1Core->cb = cb;
|
---|
| 450 | pAsn1Core->uData.pv = (void *)pCursor->pbCur;
|
---|
| 451 | return VINF_SUCCESS;
|
---|
| 452 | }
|
---|
| 453 |
|
---|
| 454 | if (pCursor->cbLeft)
|
---|
| 455 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_TOO_LITTLE_DATA_LEFT,
|
---|
| 456 | "%s: Too little data left to form a valid BER header", pszErrorTag);
|
---|
| 457 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_NO_MORE_DATA,
|
---|
| 458 | "%s: No more data reading BER header", pszErrorTag);
|
---|
| 459 | }
|
---|
| 460 |
|
---|
| 461 |
|
---|
| 462 | RTDECL(int) RTAsn1CursorMatchTagClassFlagsEx(PRTASN1CURSOR pCursor, PRTASN1CORE pAsn1Core, uint32_t uTag, uint32_t fClass,
|
---|
| 463 | bool fString, uint32_t fFlags, const char *pszErrorTag, const char *pszWhat)
|
---|
| 464 | {
|
---|
| 465 | if (pAsn1Core->uTag == uTag)
|
---|
| 466 | {
|
---|
| 467 | if (pAsn1Core->fClass == fClass)
|
---|
| 468 | return VINF_SUCCESS;
|
---|
| 469 | if ( fString
|
---|
| 470 | && pAsn1Core->fClass == (fClass | ASN1_TAGFLAG_CONSTRUCTED))
|
---|
| 471 | {
|
---|
| 472 | if (!(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER)))
|
---|
| 473 | return VINF_SUCCESS;
|
---|
| 474 | if (pCursor->fFlags & RTASN1CURSOR_FLAGS_CER)
|
---|
| 475 | {
|
---|
| 476 | if (pAsn1Core->cb > 1000)
|
---|
| 477 | return VINF_SUCCESS;
|
---|
| 478 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_ILLEGAL_CONSTRUCTED_STRING,
|
---|
| 479 | "%s: Constructed %s only allowed for >1000 byte in CER encoding: cb=%#x uTag=%#x fClass=%#x",
|
---|
| 480 | pszErrorTag, pszWhat, pAsn1Core->cb, pAsn1Core->uTag, pAsn1Core->fClass);
|
---|
| 481 | }
|
---|
| 482 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_ILLEGAL_CONSTRUCTED_STRING,
|
---|
| 483 | "%s: DER encoding does not allow constructed %s (cb=%#x uTag=%#x fClass=%#x)",
|
---|
| 484 | pszErrorTag, pszWhat, pAsn1Core->cb, pAsn1Core->uTag, pAsn1Core->fClass);
|
---|
| 485 | }
|
---|
| 486 | }
|
---|
| 487 |
|
---|
| 488 | if (fFlags & RTASN1CURSOR_GET_F_IMPLICIT)
|
---|
| 489 | {
|
---|
| 490 | pAsn1Core->fFlags |= RTASN1CORE_F_TAG_IMPLICIT;
|
---|
| 491 | pAsn1Core->uRealTag = uTag;
|
---|
| 492 | pAsn1Core->fRealClass = fClass;
|
---|
| 493 | return VINF_SUCCESS;
|
---|
| 494 | }
|
---|
| 495 |
|
---|
| 496 | return RTAsn1CursorSetInfo(pCursor, pAsn1Core->uTag != uTag ? VERR_ASN1_CURSOR_TAG_MISMATCH : VERR_ASN1_CURSOR_TAG_FLAG_CLASS_MISMATCH,
|
---|
| 497 | "%s: Unexpected %s type/flags: %#x/%#x (expected %#x/%#x)",
|
---|
| 498 | pszErrorTag, pszWhat, pAsn1Core->uTag, pAsn1Core->fClass, uTag, fClass);
|
---|
| 499 | }
|
---|
| 500 |
|
---|
| 501 |
|
---|
| 502 |
|
---|
| 503 | static int rtAsn1CursorGetXxxxCursor(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t uTag, uint8_t fClass,
|
---|
| 504 | PRTASN1CORE pAsn1Core, PRTASN1CURSOR pRetCursor,
|
---|
| 505 | const char *pszErrorTag, const char *pszWhat)
|
---|
| 506 | {
|
---|
| 507 | int rc = RTAsn1CursorReadHdr(pCursor, pAsn1Core, pszErrorTag);
|
---|
| 508 | if (RT_SUCCESS(rc))
|
---|
| 509 | {
|
---|
| 510 | if ( pAsn1Core->uTag == uTag
|
---|
| 511 | && pAsn1Core->fClass == fClass)
|
---|
| 512 | rc = VINF_SUCCESS;
|
---|
| 513 | else if (fFlags & RTASN1CURSOR_GET_F_IMPLICIT)
|
---|
| 514 | {
|
---|
| 515 | pAsn1Core->fFlags |= RTASN1CORE_F_TAG_IMPLICIT;
|
---|
| 516 | pAsn1Core->uRealTag = uTag;
|
---|
| 517 | pAsn1Core->fRealClass = fClass;
|
---|
| 518 | rc = VINF_SUCCESS;
|
---|
| 519 | }
|
---|
| 520 | else
|
---|
| 521 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_ILLEGAL_CONSTRUCTED_STRING,
|
---|
| 522 | "%s: Unexpected %s type/flags: %#x/%#x (expected %#x/%#x)",
|
---|
| 523 | pszErrorTag, pszWhat, pAsn1Core->uTag, pAsn1Core->fClass, uTag, fClass);
|
---|
[52533] | 524 | rc = RTAsn1CursorInitSub(pCursor, pAsn1Core->cb, pRetCursor, pszErrorTag);
|
---|
| 525 | if (RT_SUCCESS(rc))
|
---|
| 526 | {
|
---|
| 527 | pAsn1Core->fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
|
---|
| 528 | return VINF_SUCCESS;
|
---|
| 529 | }
|
---|
[51770] | 530 | }
|
---|
| 531 | return rc;
|
---|
| 532 | }
|
---|
| 533 |
|
---|
| 534 |
|
---|
| 535 | RTDECL(int) RTAsn1CursorGetSequenceCursor(PRTASN1CURSOR pCursor, uint32_t fFlags,
|
---|
| 536 | PRTASN1SEQUENCECORE pSeqCore, PRTASN1CURSOR pSeqCursor, const char *pszErrorTag)
|
---|
| 537 | {
|
---|
| 538 | return rtAsn1CursorGetXxxxCursor(pCursor, fFlags, ASN1_TAG_SEQUENCE, ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED,
|
---|
| 539 | &pSeqCore->Asn1Core, pSeqCursor, pszErrorTag, "sequence");
|
---|
| 540 | }
|
---|
| 541 |
|
---|
| 542 |
|
---|
| 543 | RTDECL(int) RTAsn1CursorGetSetCursor(PRTASN1CURSOR pCursor, uint32_t fFlags,
|
---|
| 544 | PRTASN1SETCORE pSetCore, PRTASN1CURSOR pSetCursor, const char *pszErrorTag)
|
---|
| 545 | {
|
---|
| 546 | return rtAsn1CursorGetXxxxCursor(pCursor, fFlags, ASN1_TAG_SET, ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_CONSTRUCTED,
|
---|
| 547 | &pSetCore->Asn1Core, pSetCursor, pszErrorTag, "set");
|
---|
| 548 | }
|
---|
| 549 |
|
---|
| 550 |
|
---|
| 551 | RTDECL(int) RTAsn1CursorGetContextTagNCursor(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t uExpectedTag,
|
---|
[59665] | 552 | PCRTASN1COREVTABLE pVtable, PRTASN1CONTEXTTAG pCtxTag, PRTASN1CURSOR pCtxTagCursor,
|
---|
| 553 | const char *pszErrorTag)
|
---|
[51770] | 554 | {
|
---|
[59665] | 555 | int rc = rtAsn1CursorGetXxxxCursor(pCursor, fFlags, uExpectedTag, ASN1_TAGCLASS_CONTEXT | ASN1_TAGFLAG_CONSTRUCTED,
|
---|
| 556 | &pCtxTag->Asn1Core, pCtxTagCursor, pszErrorTag, "ctx tag");
|
---|
| 557 | pCtxTag->Asn1Core.pOps = pVtable;
|
---|
| 558 | return rc;
|
---|
[51770] | 559 | }
|
---|
| 560 |
|
---|
| 561 |
|
---|
| 562 | RTDECL(int) RTAsn1CursorPeek(PRTASN1CURSOR pCursor, PRTASN1CORE pAsn1Core)
|
---|
| 563 | {
|
---|
[74672] | 564 | uint32_t cbSavedLeft = pCursor->cbLeft;
|
---|
| 565 | uint8_t const *pbSavedCur = pCursor->pbCur;
|
---|
| 566 | uint8_t const fSavedFlags = pCursor->fFlags;
|
---|
| 567 | PRTERRINFO const pErrInfo = pCursor->pPrimary->pErrInfo;
|
---|
[51770] | 568 | pCursor->pPrimary->pErrInfo = NULL;
|
---|
| 569 |
|
---|
| 570 | int rc = RTAsn1CursorReadHdr(pCursor, pAsn1Core, "peek");
|
---|
| 571 |
|
---|
| 572 | pCursor->pPrimary->pErrInfo = pErrInfo;
|
---|
[74672] | 573 | pCursor->pbCur = pbSavedCur;
|
---|
| 574 | pCursor->cbLeft = cbSavedLeft;
|
---|
| 575 | pCursor->fFlags = fSavedFlags;
|
---|
[51770] | 576 | return rc;
|
---|
| 577 | }
|
---|
| 578 |
|
---|
| 579 |
|
---|
| 580 | RTDECL(bool) RTAsn1CursorIsNextEx(PRTASN1CURSOR pCursor, uint32_t uTag, uint8_t fClass)
|
---|
| 581 | {
|
---|
| 582 | RTASN1CORE Asn1Core;
|
---|
| 583 | int rc = RTAsn1CursorPeek(pCursor, &Asn1Core);
|
---|
| 584 | if (RT_SUCCESS(rc))
|
---|
| 585 | return uTag == Asn1Core.uTag
|
---|
| 586 | && fClass == Asn1Core.fClass;
|
---|
| 587 | return false;
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 |
|
---|
| 591 | /** @name Legacy Interfaces.
|
---|
| 592 | * @{ */
|
---|
| 593 | RTDECL(int) RTAsn1CursorGetCore(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1CORE pAsn1Core, const char *pszErrorTag)
|
---|
| 594 | {
|
---|
| 595 | return RTAsn1Core_DecodeAsn1(pCursor, fFlags, pAsn1Core, pszErrorTag);
|
---|
| 596 | }
|
---|
| 597 |
|
---|
| 598 |
|
---|
| 599 | RTDECL(int) RTAsn1CursorGetNull(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1NULL pNull, const char *pszErrorTag)
|
---|
| 600 | {
|
---|
| 601 | return RTAsn1Null_DecodeAsn1(pCursor, fFlags, pNull, pszErrorTag);
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 |
|
---|
| 605 | RTDECL(int) RTAsn1CursorGetInteger(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1INTEGER pInteger, const char *pszErrorTag)
|
---|
| 606 | {
|
---|
| 607 | return RTAsn1Integer_DecodeAsn1(pCursor, fFlags, pInteger, pszErrorTag);
|
---|
| 608 | }
|
---|
| 609 |
|
---|
| 610 |
|
---|
| 611 | RTDECL(int) RTAsn1CursorGetBoolean(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BOOLEAN pBoolean, const char *pszErrorTag)
|
---|
| 612 | {
|
---|
| 613 | return RTAsn1Boolean_DecodeAsn1(pCursor, fFlags, pBoolean, pszErrorTag);
|
---|
| 614 | }
|
---|
| 615 |
|
---|
| 616 |
|
---|
| 617 | RTDECL(int) RTAsn1CursorGetObjId(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1OBJID pObjId, const char *pszErrorTag)
|
---|
| 618 | {
|
---|
| 619 | return RTAsn1ObjId_DecodeAsn1(pCursor, fFlags, pObjId, pszErrorTag);
|
---|
| 620 | }
|
---|
| 621 |
|
---|
| 622 |
|
---|
| 623 | RTDECL(int) RTAsn1CursorGetTime(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1TIME pTime, const char *pszErrorTag)
|
---|
| 624 | {
|
---|
| 625 | return RTAsn1Time_DecodeAsn1(pCursor, fFlags, pTime, pszErrorTag);
|
---|
| 626 | }
|
---|
| 627 |
|
---|
| 628 |
|
---|
| 629 | RTDECL(int) RTAsn1CursorGetBitStringEx(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pBitString,
|
---|
| 630 | const char *pszErrorTag)
|
---|
| 631 | {
|
---|
| 632 | return RTAsn1BitString_DecodeAsn1Ex(pCursor, fFlags, cMaxBits, pBitString, pszErrorTag);
|
---|
| 633 | }
|
---|
| 634 |
|
---|
| 635 |
|
---|
| 636 | RTDECL(int) RTAsn1CursorGetBitString(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BITSTRING pBitString, const char *pszErrorTag)
|
---|
| 637 | {
|
---|
| 638 | return RTAsn1BitString_DecodeAsn1(pCursor, fFlags, pBitString, pszErrorTag);
|
---|
| 639 | }
|
---|
| 640 |
|
---|
| 641 |
|
---|
| 642 | RTDECL(int) RTAsn1CursorGetOctetString(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1OCTETSTRING pOctetString,
|
---|
| 643 | const char *pszErrorTag)
|
---|
| 644 | {
|
---|
| 645 | return RTAsn1OctetString_DecodeAsn1(pCursor, fFlags, pOctetString, pszErrorTag);
|
---|
| 646 | }
|
---|
| 647 |
|
---|
| 648 |
|
---|
| 649 | RTDECL(int) RTAsn1CursorGetString(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1STRING pString, const char *pszErrorTag)
|
---|
| 650 | {
|
---|
| 651 | return RTAsn1String_DecodeAsn1(pCursor, fFlags, pString, pszErrorTag);
|
---|
| 652 | }
|
---|
| 653 |
|
---|
| 654 |
|
---|
| 655 | RTDECL(int) RTAsn1CursorGetIa5String(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1STRING pString, const char *pszErrorTag)
|
---|
| 656 | {
|
---|
| 657 | return RTAsn1Ia5String_DecodeAsn1(pCursor, fFlags, pString, pszErrorTag);
|
---|
| 658 | }
|
---|
| 659 |
|
---|
| 660 |
|
---|
| 661 | RTDECL(int) RTAsn1CursorGetUtf8String(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1STRING pString, const char *pszErrorTag)
|
---|
| 662 | {
|
---|
| 663 | return RTAsn1Utf8String_DecodeAsn1(pCursor, fFlags, pString, pszErrorTag);
|
---|
| 664 | }
|
---|
| 665 |
|
---|
| 666 |
|
---|
| 667 | RTDECL(int) RTAsn1CursorGetBmpString(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1STRING pString, const char *pszErrorTag)
|
---|
| 668 | {
|
---|
| 669 | return RTAsn1BmpString_DecodeAsn1(pCursor, fFlags, pString, pszErrorTag);
|
---|
| 670 | }
|
---|
| 671 |
|
---|
| 672 |
|
---|
| 673 | RTDECL(int) RTAsn1CursorGetDynType(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1DYNTYPE pDynType, const char *pszErrorTag)
|
---|
| 674 | {
|
---|
| 675 | return RTAsn1DynType_DecodeAsn1(pCursor, fFlags, pDynType, pszErrorTag);
|
---|
| 676 | }
|
---|
| 677 | /** @} */
|
---|
| 678 |
|
---|