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Torrent 词汇

Piece / 片段

  • 做种的文件会被划分为片段
  • 通常为 64kB, 128kB, 512kB, 1MB, 2MB, 4MB, 8MB
  • 片段一般会随机分发
  • .torrent 文件包含了每个片段的 hash - MD4 - 20 byte
  • .torrent 文件中定义的文件通过 offset 和 length 来查找所需的片段

ed2k

  • 特殊的链接格式
  • 常见
    • ed2k://|file|<file name>|<file size>|<file hash>|h=<Root Hash>|/
  • RootHash 用于 AICH 算法参数
  • eD2k Links

ICH - Intelligent Corruption Handling

AICH - Advanced Intelligent Corruption Handling

  • 基于 Root Hash

下载器常见特性

  • preload magnet metadata
  • tracker exchange
  • embedded tracker
  • built-in search engine
  • super-seeding
    • Super-seeding is an algorithm used to allow downloaders become uploaders quicker.
  • broadcatching
    • automatically downloading content as soon as it's available
    • usually implemented via RSS
    • proxy server
  • Prioritization, Selective Downloading, DHT, PEX, LPD, Magnet URI
  • MSE/PE security
  • UPnP, NAT-PMP, NAT traversal for automatic router configuration
  • UDP tracker and µTP data transfer protocol
  • Web seeding and Local Peer Discovery