author | František Kučera <franta-hg@frantovo.cz> |
Sun, 20 Jun 2021 20:16:46 +0200 | |
branch | v_0 |
changeset 13 | d5e2cb9e31f1 |
parent 12 | 243ef6c91dbb |
child 14 | 02725d301010 |
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 "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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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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h.tag = tagByte & (0xFF >> 3); |
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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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uint8_t lengthByte; |
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read(&lengthByte, 1); |
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std::wcerr << L"lengthByte = " << lengthByte << std::endl; |
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if (lengthByte >> 7 == 0) { |
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h.definiteLength = true; |
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h.length = lengthByte; |
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} else if (lengthByte == 0b10000000) { |
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h.definiteLength = false; |
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h.length = 0; |
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} else if (lengthByte == 0xFF) { |
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throw relpipe::writer::RelpipeWriterException(L"ASN.1 lengthByte == 0xFF (reserved value)"); // TODO: better exception |
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} else { |
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// FIXME: longer values |
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throw relpipe::writer::RelpipeWriterException(L"not yet implemented, ASN.1 lengthBytes: longer value"); // TODO: better exception |
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} |
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89 |
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90 |
return h; |
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91 |
} |
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92 |
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93 |
void readNext() { |
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94 |
Header typeHeader = readHeader(); |
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95 |
commit(); |
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96 |
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97 |
if (!started) { |
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98 |
handlers.writeStreamStart(); |
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99 |
started = true; |
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100 |
} |
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101 |
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102 |
handlers.writeCollectionStart(ASN1ContentHandler::CollectionType::Sequence); |
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103 |
handlers.writeNull(); |
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104 |
handlers.writeBoolean(true); |
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105 |
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106 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "tagClass:"); |
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107 |
handlers.writeInteger((int64_t) typeHeader.tagClass); |
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108 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "pc:"); |
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109 |
handlers.writeInteger((int64_t) typeHeader.pc); |
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110 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "tag:"); |
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handlers.writeInteger((int64_t) typeHeader.tag); |
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112 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "definiteLength:"); |
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113 |
handlers.writeBoolean(typeHeader.definiteLength); |
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114 |
handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "length:"); |
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handlers.writeInteger((int64_t) typeHeader.length); |
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116 |
|
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handlers.writeString(ASN1ContentHandler::StringType::UTF8String, "relational pipes"); |
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118 |
handlers.writeCollectionEnd(); |
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119 |
} |
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120 |
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121 |
protected: |
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122 |
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123 |
void update() override { |
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while (true) readNext(); |
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125 |
} |
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126 |
|
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127 |
public: |
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128 |
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129 |
void close() override { |
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130 |
if (started) handlers.writeStreamEnd(); |
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131 |
} |
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132 |
|
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133 |
}; |
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134 |
|
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135 |
} |
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136 |
} |
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137 |
} |
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138 |
} |