bittorrent - 种子文件的内容

Question

我对种子文件有疑问。我知道它包含我需要连接的服务器（用户）列表，用于下载整个文件的一部分。

我的问题是，这是否就是洪流所包含的全部内容？还有更重要的细节吗？

谢谢！

Answer 1

种子文件是一种特殊格式的二进制文件。它始终包含有关所有片段的文件列表和完整性元数据，并且可以选择包含跟踪器列表。

一个 torrent 文件是一个带有以下键的编码字典：

announce - the URL of the tracker
info - this maps to a dictionary whose keys are dependent on whether one or more files are being shared:
    name - suggested file/directory name where the file(s) is/are to be saved
    piece length - number of bytes per piece. This is commonly 28KiB = 256 KiB = 262,144 B.
    pieces - a hash list. That is, a concatenation of each piece's SHA-1 hash. As SHA-1 returns a 160-bit hash, pieces will be a string whose length is a multiple of 160-bits.
    length - size of the file in bytes (only when one file is being shared)
    files - a list of dictionaries each corresponding to a file (only when multiple files are being shared). Each dictionary has the following keys:
        path - a list of strings corresponding to subdirectory names, the last of which is the actual file name
        length - size of the file in bytes.