Question

我想（快速）将程序/脚本放在一起，从.torrent文件中读取文件集。我想使用该集删除特定目录中不属于torrent的任何文件。

关于从.torrent文件中读取此索引的方便库的任何建议？虽然我不反对，但我不想深入研究bittorrent规范并从头开始为这个简单的目的滚动大量代码。

我对语言没有偏好。

Answer 1

我会使用rasterbar的libtorrent这是一个小而快的C ++库要迭代文件，您可以使用torrent_info类（begin_files（），end_files（））。

libtorrent还有一个python interface：

import libtorrent
info = libtorrent.torrent_info('test.torrent')
for f in info.files():
    print "%s - %s" % (f.path, f.size)

Answer 2

Effbot has your question answered。以下是从.torrent文件（Python 2.4 +）中读取文件列表的完整代码：

import re

def tokenize(text, match=re.compile("([idel])|(\d+):|(-?\d+)").match):
    i = 0
    while i < len(text):
        m = match(text, i)
        s = m.group(m.lastindex)
        i = m.end()
        if m.lastindex == 2:
            yield "s"
            yield text[i:i+int(s)]
            i = i + int(s)
        else:
            yield s

def decode_item(next, token):
    if token == "i":
        # integer: "i" value "e"
        data = int(next())
        if next() != "e":
            raise ValueError
    elif token == "s":
        # string: "s" value (virtual tokens)
        data = next()
    elif token == "l" or token == "d":
        # container: "l" (or "d") values "e"
        data = []
        tok = next()
        while tok != "e":
            data.append(decode_item(next, tok))
            tok = next()
        if token == "d":
            data = dict(zip(data[0::2], data[1::2]))
    else:
        raise ValueError
    return data

def decode(text):
    try:
        src = tokenize(text)
        data = decode_item(src.next, src.next())
        for token in src: # look for more tokens
            raise SyntaxError("trailing junk")
    except (AttributeError, ValueError, StopIteration):
        raise SyntaxError("syntax error")
    return data

if __name__ == "__main__":
    data = open("test.torrent", "rb").read()
    torrent = decode(data)
    for file in torrent["info"]["files"]:
        print "%r - %d bytes" % ("/".join(file["path"]), file["length"])

Answer 3

原始主线BitTorrent 5.x客户端（http://download.bittorrent.com/dl/BitTorrent-5.2.2.tar.gz）中的

bencode.py将为您提供Python中的参考实现。

它对BTL包具有导入依赖性，但这很容易删除。然后你会看看bencode.bdecode（filecontent）['info'] ['files']。

Answer 4

扩展上述想法，我做了以下事情：

~> cd ~/bin

~/bin> ls torrent*
torrent-parse.py  torrent-parse.sh

~/bin> cat torrent-parse.py
# torrent-parse.py
import sys
import libtorrent

# get the input torrent file
if (len(sys.argv) > 1):
    torrent = sys.argv[1]
else:
    print "Missing param: torrent filename"
    sys.exit()
# get names of files in the torrent file
info = libtorrent.torrent_info(torrent);
for f in info.files():
    print "%s - %s" % (f.path, f.size)

~/bin> cat torrent-parse.sh
#!/bin/bash
if [ $# -lt 1 ]; then
  echo "Missing param: torrent filename"
  exit 0
fi

python torrent-parse.py "$*"

您希望适当设置权限以使shell脚本可执行：

~/bin> chmod a+x torrent-parse.sh

希望这有助于某人：）

Answer 5

这里是Constantine上面的答案中的代码，稍加修改以处理torrent文件名中的Unicode字符和torrent信息中的文件集文件名：

import re

def tokenize(text, match=re.compile("([idel])|(\d+):|(-?\d+)").match):
    i = 0
    while i < len(text):
        m = match(text, i)
        s = m.group(m.lastindex)
        i = m.end()
        if m.lastindex == 2:
            yield "s"
            yield text[i:i+int(s)]
            i = i + int(s)
        else:
            yield s

def decode_item(next, token):
    if token == "i":
        # integer: "i" value "e"
        data = int(next())
        if next() != "e":
            raise ValueError
    elif token == "s":
        # string: "s" value (virtual tokens)
        data = next()
    elif token == "l" or token == "d":
        # container: "l" (or "d") values "e"
        data = []
        tok = next()
        while tok != "e":
            data.append(decode_item(next, tok))
            tok = next()
        if token == "d":
            data = dict(zip(data[0::2], data[1::2]))
    else:
        raise ValueError
    return data

def decode(text):
    try:
        src = tokenize(text)
        data = decode_item(src.next, src.next())
        for token in src: # look for more tokens
            raise SyntaxError("trailing junk")
    except (AttributeError, ValueError, StopIteration):
        raise SyntaxError("syntax error")
    return data

n = 0
if __name__ == "__main__":
    data = open("C:\\Torrents\\test.torrent", "rb").read()
    torrent = decode(data)
    for file in torrent["info"]["files"]:
        n = n + 1
        filenamepath = file["path"]     
        print str(n) + " -- " + ', '.join(map(str, filenamepath))
        fname = ', '.join(map(str, filenamepath))

        print fname + " -- " + str(file["length"])

从torrent中读取文件集

5 个答案: