07-formats.md

Форматы сериализации

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SMTP, HTTP, etc

HTTP/1.1 304 Not Modified
Server: nginx
Date: Mon, 31 Oct 2022 06:26:40 GMT
Connection: keep-alive
ETag: "10184-5eb742298960c"

Типичны регулярные грамматики, хорошо парсятся Ragel'eм (не всегда удачно)

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XML

с XML всё понятно

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JSON

• {"key":["array","of","values"]}
• json.org
• IETF RFCs, ECMA standard

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JSON is a minefield

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Unicode

• UCS-2
• UTF-16
• UTF-8
• UTF-32

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TCP/IP etc

C struct 1:1

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TLV binary

1. type
2. length
3. value

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Protobuf

message Person {
  optional string name = 1;
  optional int32 id = 2;
  optional string email = 3;
}

TLV-like coding

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FlatBuffers/Cap'n Proto

• there is no spoon
• Realm

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Databases

• B-Trees
• Log Structured
  Merge Trees
• Columnar
• Datoms (see Fleet)

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In vivo

• BitCoin
• git
• BitTorrent