author | František Kučera <franta-hg@frantovo.cz> |
Tue, 22 Jun 2021 21:41:59 +0200 | |
branch | v_0 |
changeset 16 | bb457bb5b515 |
parent 15 | 95ca127ba816 |
child 17 | f5281ab3e68f |
permissions | -rw-r--r-- |
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AbstractParser: AbstractParser, ASN1Reader, ASN1ContentHandler, SAXContentHandler, BasicASN1Reader, DOMBuildingSAXContentHandler, GenericASN1ContentHandler skeletons
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/** |
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* Relational pipes |
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* Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <memory> |
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#include <vector> |
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#include <array> |
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#include <sstream> |
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#include "ASN1Reader.h" |
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namespace relpipe { |
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namespace in { |
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namespace asn1 { |
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namespace lib { |
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/** |
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* Reads ASN.1 data encoded as BER (DER, CER). |
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*/ |
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class BasicASN1Reader : public ASN1Reader { |
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private: |
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bool started = false; |
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enum class TagClass : uint8_t { |
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Universal = 0, |
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Application = 1, |
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ContextSpecific = 2, |
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Private = 3 |
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}; |
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enum class PC : uint8_t { |
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Primitive = 0, |
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Constructed = 1 |
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}; |
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class Header { |
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public: |
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TagClass tagClass; |
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PC pc; |
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uint64_t tag; |
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bool definiteLength; |
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size_t length; |
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}; |
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class LevelMetadata { |
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public: |
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bool definiteLength; |
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size_t length; |
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size_t start; |
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}; |
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std::vector<LevelMetadata> level; |
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void checkRemainingItems() { |
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if (level.size()) { |
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LevelMetadata& l = level.back(); |
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if (l.definiteLength && l.length == getBytesRead() - l.start) { |
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level.pop_back(); |
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handlers.writeCollectionEnd(); |
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checkRemainingItems(); // multiple collections may end at the same point |
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} |
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} |
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} |
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Header readHeader() { |
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Header h; |
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memset(&h, 0, sizeof (h)); // TODO: remove, not needed |
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uint8_t tagByte; |
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read(&tagByte, 1); |
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h.tagClass = (TagClass) (tagByte >> 6); |
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h.pc = (PC) ((tagByte >> 5) & 1); |
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90 |
h.tag = tagByte & (0xFF >> 3); |
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91 |
if (h.tag > 30) throw relpipe::writer::RelpipeWriterException(L"not yet implemented, ASN.1 tag > 30"); // FIXME: higher tag values → read more bytes |
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92 |
|
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93 |
uint8_t lengthByte; |
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94 |
read(&lengthByte, 1); |
1
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AbstractParser: AbstractParser, ASN1Reader, ASN1ContentHandler, SAXContentHandler, BasicASN1Reader, DOMBuildingSAXContentHandler, GenericASN1ContentHandler skeletons
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95 |
|
13
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96 |
if (lengthByte >> 7 == 0) { |
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97 |
// definite short |
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98 |
h.definiteLength = true; |
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99 |
h.length = lengthByte; |
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100 |
} else if (lengthByte == 0b10000000) { |
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101 |
// indefinite |
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102 |
h.definiteLength = false; |
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103 |
h.length = 0; |
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104 |
} else if (lengthByte == 0xFF) { |
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105 |
throw relpipe::writer::RelpipeWriterException(L"ASN.1 lengthByte == 0xFF (reserved value)"); // TODO: better exception |
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106 |
} else { |
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107 |
// definite long |
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108 |
h.definiteLength = true; |
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109 |
h.length = 0; |
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110 |
std::vector<uint8_t> lengthBytes(lengthByte & 0b01111111, 0); |
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111 |
read(lengthBytes.data(), lengthBytes.size()); |
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112 |
for (uint8_t l : lengthBytes) h.length = (h.length << 8) + l; |
13
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113 |
} |
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114 |
|
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115 |
return h; |
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116 |
} |
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117 |
|
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118 |
void readNext() { |
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119 |
checkRemainingItems(); |
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120 |
Header typeHeader = readHeader(); |
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121 |
// commit(); // TODO: commit here and recover later instead of rollback? |
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122 |
|
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123 |
if (!started) { |
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124 |
handlers.writeStreamStart(); |
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125 |
started = true; |
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126 |
} |
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127 |
|
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128 |
// TODO: check tagClass and pc |
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129 |
|
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130 |
// TODO: constants, more types |
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131 |
if (typeHeader.tag == 0 && typeHeader.tagClass == TagClass::Universal && typeHeader.pc == PC::Primitive) { |
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132 |
handlers.writeCollectionEnd(); |
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133 |
} else if (typeHeader.tag == 16) { |
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134 |
level.push_back({typeHeader.definiteLength, typeHeader.length, getBytesRead()}); // TODO: transaction |
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135 |
handlers.writeCollectionStart(ASN1ContentHandler::CollectionType::Sequence); |
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136 |
} else if (typeHeader.tag == 17) { |
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137 |
level.push_back({typeHeader.definiteLength, typeHeader.length, getBytesRead()}); // TODO: transaction |
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138 |
handlers.writeCollectionStart(ASN1ContentHandler::CollectionType::Set); |
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139 |
} else if (typeHeader.pc == PC::Constructed) { |
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140 |
level.push_back({typeHeader.definiteLength, typeHeader.length, getBytesRead()}); // TODO: transaction |
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|
141 |
handlers.writeCollectionStart(ASN1ContentHandler::CollectionType::Constructed); |
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142 |
} else if (typeHeader.tag == 5 && typeHeader.length == 0) { |
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143 |
handlers.writeNull(); |
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144 |
} else if (typeHeader.tag == 1) { |
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145 |
bool value; |
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146 |
read((uint8_t*) & value, 1); |
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|
147 |
handlers.writeBoolean(value); |
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148 |
} else if (typeHeader.tag == 12 && typeHeader.tagClass == TagClass::Universal) { |
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|
149 |
std::string s; |
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|
150 |
s.resize(typeHeader.length); |
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|
151 |
read((uint8_t*) s.data(), typeHeader.length); |
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|
152 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, s); |
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|
153 |
} else if (typeHeader.tag == 19 && typeHeader.tagClass == TagClass::Universal) { |
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|
154 |
// TODO: check encoding |
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|
155 |
std::string s; |
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|
156 |
s.resize(typeHeader.length); |
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|
157 |
read((uint8_t*) s.data(), typeHeader.length); |
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|
158 |
handlers.writeString(ASN1ContentHandler::StringType::PrintableString, s); |
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|
159 |
} else { |
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|
160 |
// TODO: do not skip, parse |
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|
161 |
std::vector<uint8_t> temp(typeHeader.length, 0); |
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|
162 |
read(temp.data(), typeHeader.length); |
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|
163 |
// TODO: recover transaction? |
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|
164 |
|
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|
165 |
std::stringstream description; |
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|
166 |
description << "value:" |
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|
167 |
<< " tag = " << typeHeader.tag |
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|
168 |
<< " tagClass = " << (int) typeHeader.tagClass |
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|
169 |
<< " pc = " << (int) typeHeader.pc |
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|
170 |
<< " length = " << typeHeader.length |
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|
171 |
<< " definite = " << (typeHeader.definiteLength ? "true" : "false"); |
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172 |
|
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|
173 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, description.str()); |
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|
174 |
} |
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|
175 |
|
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|
176 |
commit(); |
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|
177 |
|
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178 |
|
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|
179 |
// TODO: remove debug/demo output: |
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|
180 |
return; |
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|
181 |
handlers.writeCollectionStart(ASN1ContentHandler::CollectionType::Sequence); |
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|
182 |
handlers.writeNull(); |
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|
183 |
handlers.writeBoolean(true); |
13
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|
184 |
|
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|
185 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "tagClass:"); |
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|
186 |
handlers.writeInteger((int64_t) typeHeader.tagClass); |
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handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "pc:"); |
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handlers.writeInteger((int64_t) typeHeader.pc); |
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handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "tag:"); |
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handlers.writeInteger((int64_t) typeHeader.tag); |
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handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "definiteLength:"); |
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handlers.writeBoolean(typeHeader.definiteLength); |
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handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "length:"); |
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handlers.writeInteger((int64_t) typeHeader.length); |
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195 |
|
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handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "relational pipes"); |
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handlers.writeCollectionEnd(); |
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198 |
} |
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199 |
|
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protected: |
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201 |
|
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202 |
void update() override { |
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203 |
while (true) readNext(); |
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204 |
} |
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205 |
|
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206 |
public: |
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207 |
|
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208 |
void close() override { |
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209 |
checkRemainingItems(); |
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// TODO: check the bytes remaining in the buffer |
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if (started) handlers.writeStreamEnd(); |
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212 |
} |
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213 |
|
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214 |
}; |
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215 |
|
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216 |
} |
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217 |
} |
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218 |
} |
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219 |
} |