1 | /* $Id: asn1-ut-time-decode.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - ASN.1, UTC TIME and GENERALIZED TIME Types, Decoding.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include "internal/iprt.h"
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32 | #include <iprt/asn1.h>
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33 |
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34 | #include <iprt/alloca.h>
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35 | #include <iprt/err.h>
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36 | #include <iprt/string.h>
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37 | #include <iprt/ctype.h>
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38 |
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39 | #include <iprt/formats/asn1.h>
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40 |
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41 |
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42 | /**
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43 | * Common code for UTCTime and GeneralizedTime converters that normalizes the
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44 | * converted time and checks that the input values doesn't change.
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45 | *
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46 | * @returns IPRT status code.
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47 | * @param pCursor The cursor to use when reporting an error.
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48 | * @param pThis The time to normalize and check.
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49 | * @param pszType The type name.
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50 | * @param pszErrorTag The error tag.
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51 | */
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52 | static int rtAsn1Time_NormalizeTime(PRTASN1CURSOR pCursor, PRTASN1TIME pThis, const char *pszType, const char *pszErrorTag)
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53 | {
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54 | int rc;
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55 | if ( pThis->Time.u8Month > 0
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56 | && pThis->Time.u8Month <= 12
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57 | && pThis->Time.u8Hour < 24
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58 | && pThis->Time.u8Minute < 60
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59 | && pThis->Time.u8Second < 60) /** @todo what about leap seconds? */
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60 | {
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61 | RTTIME const TimeCopy = pThis->Time;
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62 | if (RTTimeNormalize(&pThis->Time))
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63 | {
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64 | if ( TimeCopy.u8MonthDay == pThis->Time.u8MonthDay
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65 | && TimeCopy.u8Month == pThis->Time.u8Month
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66 | && TimeCopy.i32Year == pThis->Time.i32Year
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67 | && TimeCopy.u8Hour == pThis->Time.u8Hour
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68 | && TimeCopy.u8Minute == pThis->Time.u8Minute
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69 | && TimeCopy.u8Second == pThis->Time.u8Second)
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70 | return VINF_SUCCESS;
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71 |
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72 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_TIME_NORMALIZE_MISMATCH,
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73 | "%s: Normalized result not the same as %s: '%.*s'",
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74 | pszErrorTag, pszType, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch);
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75 | }
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76 | else
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77 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_TIME_NORMALIZE_ERROR,
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78 | "%s: RTTimeNormalize failed on %s: '%.*s'",
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79 | pszErrorTag, pszType, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch);
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80 | }
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81 | else
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82 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_TIME_BAD_NORMALIZE_INPUT,
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83 | "%s: Bad %s values: '%.*s'; mth=%u h=%u min=%u sec=%u",
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84 | pszErrorTag, pszType, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch,
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85 | pThis->Time.u8Month, pThis->Time.u8Hour, pThis->Time.u8Minute, pThis->Time.u8Second);
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86 | return rc;
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87 | }
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88 |
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89 |
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90 | /**
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91 | * Converts the UTCTime string into an the RTTIME member of RTASN1TIME.
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92 | *
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93 | * @returns IPRT status code.
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94 | * @param pCursor The cursor to use when reporting an error.
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95 | * @param pThis The time to parse.
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96 | * @param pszErrorTag The error tag.
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97 | */
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98 | static int rtAsn1Time_ConvertUTCTime(PRTASN1CURSOR pCursor, PRTASN1TIME pThis, const char *pszErrorTag)
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99 | {
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100 | /*
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101 | * While the current spec says the seconds field is not optional, this
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102 | * restriction was added later on. So, when parsing UTCTime we must deal
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103 | * with it being absent.
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104 | */
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105 | int rc;
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106 | bool fHaveSeconds = pThis->Asn1Core.cb == sizeof("YYMMDDHHMMSSZ") - 1;
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107 | if (fHaveSeconds || pThis->Asn1Core.cb == sizeof("YYMMDDHHMMZ") - 1)
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108 | {
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109 | const char *pachTime = pThis->Asn1Core.uData.pch;
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110 |
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111 | /* Basic encoding validation. */
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112 | if ( RT_C_IS_DIGIT(pachTime[0]) /* Y */
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113 | && RT_C_IS_DIGIT(pachTime[1]) /* Y */
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114 | && RT_C_IS_DIGIT(pachTime[2]) /* M */
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115 | && RT_C_IS_DIGIT(pachTime[3]) /* M */
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116 | && RT_C_IS_DIGIT(pachTime[4]) /* D */
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117 | && RT_C_IS_DIGIT(pachTime[5]) /* D */
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118 | && RT_C_IS_DIGIT(pachTime[6]) /* H */
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119 | && RT_C_IS_DIGIT(pachTime[7]) /* H */
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120 | && RT_C_IS_DIGIT(pachTime[8]) /* M */
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121 | && RT_C_IS_DIGIT(pachTime[9]) /* M */
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122 | && ( !fHaveSeconds
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123 | || ( RT_C_IS_DIGIT(pachTime[10]) /* S */
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124 | && RT_C_IS_DIGIT(pachTime[11]) /* S */ ) )
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125 | && pachTime[fHaveSeconds ? 12 : 10] == 'Z'
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126 | )
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127 | {
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128 | /* Basic conversion. */
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129 | pThis->Time.i32Year = (pachTime[0] - '0') * 10 + (pachTime[1] - '0');
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130 | pThis->Time.i32Year += pThis->Time.i32Year < 50 ? 2000 : 1900;
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131 | pThis->Time.u8Month = (pachTime[2] - '0') * 10 + (pachTime[3] - '0');
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132 | pThis->Time.u8WeekDay = 0;
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133 | pThis->Time.u16YearDay = 0;
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134 | pThis->Time.u8MonthDay = (pachTime[4] - '0') * 10 + (pachTime[5] - '0');
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135 | pThis->Time.u8Hour = (pachTime[6] - '0') * 10 + (pachTime[7] - '0');
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136 | pThis->Time.u8Minute = (pachTime[8] - '0') * 10 + (pachTime[9] - '0');
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137 | if (fHaveSeconds)
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138 | pThis->Time.u8Second = (pachTime[10] - '0') * 10 + (pachTime[11] - '0');
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139 | else
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140 | pThis->Time.u8Second = 0;
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141 | pThis->Time.u32Nanosecond = 0;
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142 | pThis->Time.fFlags = RTTIME_FLAGS_TYPE_UTC;
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143 | pThis->Time.offUTC = 0;
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144 |
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145 | /* Check the convered data and normalize the time structure. */
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146 | rc = rtAsn1Time_NormalizeTime(pCursor, pThis, "UTCTime", pszErrorTag);
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147 | if (RT_SUCCESS(rc))
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148 | return rc;
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149 | }
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150 | else
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151 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_UTC_TIME_ENCODING, "%s: Bad UTCTime encoding: '%.*s'",
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152 | pszErrorTag, pThis->Asn1Core.cb, pachTime);
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153 | }
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154 | else
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155 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_UTC_TIME_ENCODING, "%s: Bad UTCTime length: %#x",
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156 | pszErrorTag, pThis->Asn1Core.cb);
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157 | RT_ZERO(*pThis);
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158 | return rc;
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159 | }
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160 |
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161 |
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162 | /**
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163 | * Converts the fraction part of a generalized time into nanoseconds.
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164 | *
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165 | * @returns IPRT status code.
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166 | * @param pCursor The cursor to use when reporting an error.
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167 | * @param pchFraction Pointer to the start of the fraction (dot).
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168 | * @param cchFraction The length of the fraction.
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169 | * @param pThis The time object we're working on,
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170 | * Time.u32Nanoseconds will be update.
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171 | * @param pszErrorTag The error tag.
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172 | */
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173 | static int rtAsn1Time_ConvertGeneralizedTimeFraction(PRTASN1CURSOR pCursor, const char *pchFraction, uint32_t cchFraction,
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174 | PRTASN1TIME pThis, const char *pszErrorTag)
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175 | {
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176 | pThis->Time.u32Nanosecond = 0;
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177 |
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178 | /*
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179 | * Check the dot.
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180 | */
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181 | if (*pchFraction != '.')
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182 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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183 | "%s: Expected GeneralizedTime fraction dot, found: '%c' ('%.*s')",
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184 | pszErrorTag, *pchFraction, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch);
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185 | pchFraction++;
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186 | cchFraction--;
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187 | if (!cchFraction)
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188 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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189 | "%s: No digit following GeneralizedTime fraction dot: '%.*s'",
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190 | pszErrorTag, pThis->Asn1Core.cb, pThis->Asn1Core);
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191 |
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192 | /*
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193 | * Do the conversion.
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194 | */
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195 | char chLastDigit;
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196 | uint32_t uMult = 100000000;
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197 | do
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198 | {
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199 | char chDigit = chLastDigit = *pchFraction;
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200 | if (!RT_C_IS_DIGIT(chDigit))
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201 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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202 | "%s: Bad GeneralizedTime fraction digit: '%.*s'",
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203 | pszErrorTag, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch);
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204 | pThis->Time.u32Nanosecond += uMult * (uint32_t)(chDigit - '0');
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205 |
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206 | /* Advance */
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207 | cchFraction--;
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208 | pchFraction++;
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209 | uMult /= 10;
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210 | } while (cchFraction > 0 && uMult > 0);
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211 |
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212 | /*
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213 | * Lazy bird: For now, we don't permit higher resolution than we can
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214 | * internally represent. Deal with this if it ever becomes an issue.
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215 | */
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216 | if (cchFraction > 0)
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217 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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218 | "%s: Bad GeneralizedTime fraction too long: '%.*s'",
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219 | pszErrorTag, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch);
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220 | if (chLastDigit == '0')
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221 | return RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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222 | "%s: Trailing zeros not allowed for GeneralizedTime: '%.*s'",
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223 | pszErrorTag, pThis->Asn1Core.cb, pThis->Asn1Core.uData.pch);
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224 | return VINF_SUCCESS;
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225 | }
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226 |
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227 |
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228 | /**
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229 | * Converts the GeneralizedTime string into an the RTTIME member of RTASN1TIME.
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230 | *
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231 | * @returns IPRT status code.
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232 | * @param pCursor The cursor to use when reporting an error.
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233 | * @param pThis The time to parse.
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234 | * @param pszErrorTag The error tag.
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235 | */
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236 | static int rtAsn1Time_ConvertGeneralizedTime(PRTASN1CURSOR pCursor, PRTASN1TIME pThis, const char *pszErrorTag)
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237 | {
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238 | int rc;
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239 | if (pThis->Asn1Core.cb >= sizeof("YYYYMMDDHHMMSSZ") - 1)
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240 | {
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241 | const char *pachTime = pThis->Asn1Core.uData.pch;
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242 |
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243 | /* Basic encoding validation. */
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244 | if ( RT_C_IS_DIGIT(pachTime[0]) /* Y */
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245 | && RT_C_IS_DIGIT(pachTime[1]) /* Y */
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246 | && RT_C_IS_DIGIT(pachTime[2]) /* Y */
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247 | && RT_C_IS_DIGIT(pachTime[3]) /* Y */
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248 | && RT_C_IS_DIGIT(pachTime[4]) /* M */
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249 | && RT_C_IS_DIGIT(pachTime[5]) /* M */
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250 | && RT_C_IS_DIGIT(pachTime[6]) /* D */
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251 | && RT_C_IS_DIGIT(pachTime[7]) /* D */
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252 | && RT_C_IS_DIGIT(pachTime[8]) /* H */
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253 | && RT_C_IS_DIGIT(pachTime[9]) /* H */
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254 | && RT_C_IS_DIGIT(pachTime[10]) /* M */
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255 | && RT_C_IS_DIGIT(pachTime[11]) /* M */
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256 | && RT_C_IS_DIGIT(pachTime[12]) /* S */ /** @todo was this once optional? */
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257 | && RT_C_IS_DIGIT(pachTime[13]) /* S */
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258 | && pachTime[pThis->Asn1Core.cb - 1] == 'Z'
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259 | )
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260 | {
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261 | /* Basic conversion. */
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262 | pThis->Time.i32Year = 1000 * (pachTime[0] - '0')
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263 | + 100 * (pachTime[1] - '0')
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264 | + 10 * (pachTime[2] - '0')
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265 | + (pachTime[3] - '0');
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266 | pThis->Time.u8Month = (pachTime[4] - '0') * 10 + (pachTime[5] - '0');
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267 | pThis->Time.u8WeekDay = 0;
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268 | pThis->Time.u16YearDay = 0;
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269 | pThis->Time.u8MonthDay = (pachTime[6] - '0') * 10 + (pachTime[7] - '0');
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270 | pThis->Time.u8Hour = (pachTime[8] - '0') * 10 + (pachTime[9] - '0');
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271 | pThis->Time.u8Minute = (pachTime[10] - '0') * 10 + (pachTime[11] - '0');
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272 | pThis->Time.u8Second = (pachTime[12] - '0') * 10 + (pachTime[13] - '0');
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273 | pThis->Time.u32Nanosecond = 0;
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274 | pThis->Time.fFlags = RTTIME_FLAGS_TYPE_UTC;
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275 | pThis->Time.offUTC = 0;
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276 |
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277 | /* Optional fraction part. */
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278 | rc = VINF_SUCCESS;
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279 | uint32_t cchLeft = pThis->Asn1Core.cb - 14 - 1;
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280 | if (cchLeft > 0)
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281 | rc = rtAsn1Time_ConvertGeneralizedTimeFraction(pCursor, pachTime + 14, cchLeft, pThis, pszErrorTag);
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282 |
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283 | /* Check the convered data and normalize the time structure. */
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284 | if (RT_SUCCESS(rc))
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285 | {
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286 | rc = rtAsn1Time_NormalizeTime(pCursor, pThis, "GeneralizedTime", pszErrorTag);
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287 | if (RT_SUCCESS(rc))
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288 | return VINF_SUCCESS;
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289 | }
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290 | }
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291 | else
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292 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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293 | "%s: Bad GeneralizedTime encoding: '%.*s'",
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294 | pszErrorTag, pThis->Asn1Core.cb, pachTime);
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295 | }
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296 | else
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297 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_GENERALIZED_TIME_ENCODING,
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298 | "%s: Bad GeneralizedTime length: %#x",
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299 | pszErrorTag, pThis->Asn1Core.cb);
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300 | RT_ZERO(*pThis);
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301 | return rc;
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302 | }
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303 |
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304 |
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305 | RTDECL(int) RTAsn1Time_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1TIME pThis, const char *pszErrorTag)
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306 | {
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307 | Assert(!(fFlags & RTASN1CURSOR_GET_F_IMPLICIT)); RT_NOREF_PV(fFlags);
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308 | int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
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309 | if (RT_SUCCESS(rc))
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310 | {
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311 | if (pThis->Asn1Core.fClass == (ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE) )
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312 | {
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313 | if (pThis->Asn1Core.uTag == ASN1_TAG_UTC_TIME)
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314 | {
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315 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
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316 | pThis->Asn1Core.pOps = &g_RTAsn1Time_Vtable;
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317 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
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318 | return rtAsn1Time_ConvertUTCTime(pCursor, pThis, pszErrorTag);
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319 | }
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320 |
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321 | if (pThis->Asn1Core.uTag == ASN1_TAG_GENERALIZED_TIME)
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322 | {
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323 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
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324 | pThis->Asn1Core.pOps = &g_RTAsn1Time_Vtable;
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325 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
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326 | return rtAsn1Time_ConvertGeneralizedTime(pCursor, pThis, pszErrorTag);
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327 | }
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328 |
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329 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_TAG_MISMATCH, "%s: Not UTCTime nor GeneralizedTime: uTag=%#x",
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330 | pszErrorTag, pThis->Asn1Core.uTag);
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331 | }
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332 | else
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333 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CURSOR_TAG_FLAG_CLASS_MISMATCH,
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334 | "%s: Not UTCTime nor GeneralizedTime: fClass=%#x / uTag=%#x",
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335 | pszErrorTag, pThis->Asn1Core.fClass, pThis->Asn1Core.uTag);
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336 | }
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337 | RT_ZERO(*pThis);
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338 | return rc;
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339 | }
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340 |
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341 |
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342 | RTDECL(int) RTAsn1UtcTime_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1TIME pThis, const char *pszErrorTag)
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343 | {
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344 | int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
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345 | if (RT_SUCCESS(rc))
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346 | {
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347 | rc = RTAsn1CursorMatchTagClassFlags(pCursor, &pThis->Asn1Core, ASN1_TAG_UTC_TIME,
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348 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
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349 | fFlags, pszErrorTag, "UTC TIME");
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350 | if (RT_SUCCESS(rc))
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351 | {
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352 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
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353 | pThis->Asn1Core.pOps = &g_RTAsn1Time_Vtable;
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354 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
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355 | return rtAsn1Time_ConvertUTCTime(pCursor, pThis, pszErrorTag);
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356 | }
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357 | }
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358 | RT_ZERO(*pThis);
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359 | return rc;
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360 | }
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361 |
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362 |
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363 | RTDECL(int) RTAsn1GeneralizedTime_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1TIME pThis, const char *pszErrorTag)
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364 | {
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365 | int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
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366 | if (RT_SUCCESS(rc))
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367 | {
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368 | rc = RTAsn1CursorMatchTagClassFlags(pCursor, &pThis->Asn1Core, ASN1_TAG_GENERALIZED_TIME,
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369 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
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370 | fFlags, pszErrorTag, "GENERALIZED TIME");
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371 | if (RT_SUCCESS(rc))
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372 | {
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373 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
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374 | pThis->Asn1Core.pOps = &g_RTAsn1Time_Vtable;
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375 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
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376 | return rtAsn1Time_ConvertGeneralizedTime(pCursor, pThis, pszErrorTag);
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377 | }
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378 | }
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379 | RT_ZERO(*pThis);
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380 | return rc;
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381 | }
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382 |
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383 |
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384 | /*
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385 | * Generate code for the associated collection types.
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386 | */
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387 | #define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-time-template.h"
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388 | #include <iprt/asn1-generator-internal-header.h>
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389 | #include <iprt/asn1-generator-asn1-decoder.h>
|
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390 |
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