[mirrorbrain-commits] r8067 - in /trunk/tools: README bdecode.py

Author: poeml
Date: Sat May 29 14:03:18 2010
New Revision: 8067

URL: http://svn.mirrorbrain.org/viewvc/mirrorbrain?rev=8067&view=rev
Log:
tools/bdecode.py added:
  Parse a Torrent file (or other BEncoded input), and pretty-print it.
  Can read from standard input: curl -s <url> | bdecode.py
  Useful to work on the Torrent generator in mod_mirrorbrain.

Added:
    trunk/tools/bdecode.py   (with props)
Modified:
    trunk/tools/README

Modified: trunk/tools/README
URL: http://svn.mirrorbrain.org/viewvc/mirrorbrain/trunk/tools/README?rev=8067&r1=8066&r2=8067&view=diff
==============================================================================
--- trunk/tools/README (original)
+++ trunk/tools/README Sat May 29 14:03:18 2010
_at_@ -49,3 +49,7 @@
        Tool to assess the size of rsync modules on a remote server, or a
        subdirectory
 
+    bdecode.py
+       Parse a Torrent file (or other BEncoded input), and pretty-print it.
+       Can read from standard input: curl -s <url> | bdecode.py
+       Useful to work on the Torrent generator in mod_mirrorbrain.

Added: trunk/tools/bdecode.py
URL: http://svn.mirrorbrain.org/viewvc/mirrorbrain/trunk/tools/bdecode.py?rev=8067&view=auto
==============================================================================
--- trunk/tools/bdecode.py (added)
+++ trunk/tools/bdecode.py Sat May 29 14:03:18 2010
_at_@ -1,0 +1,49 @@
+#!/usr/bin/python
+
+# Bencode decoder
+#
+# This code is in the public domain
+# http://buffis.com/2007/07/28/bittorrent-bencode-decoder-in-python-using-30-lines-of-code/
+
+import fileinput
+from pprint import pprint
+
+class Decoder(object):
+    def __init__(self, data): self.data, self.ptr = data, 0
+    def _cur(self): return self.data[self.ptr]
+    def _get(self, x):
+        self.ptr += x
+        return self.data[self.ptr-x:self.ptr]
+    def _get_int_until(self, c):
+        num = int(self._get(self.data.index(c, self.ptr)-self.ptr))
+        self._get(1) # kill extra char
+        return num
+    def _get_str(self): return self._get(self._get_int_until(":"))
+    def _get_int(self): return self._get_int_until("e")
+    def decode(self):
+        i = self._get(1)
+        if i == "d":
+            r = {}
+            while self._cur() != "e":
+                key = self._get_str()
+                val = self.decode()
+                r[key] = val
+            self._get(1)
+        elif i == "l":
+            r = []
+            while self._cur() != "e": r.append(self.decode())
+            self._get(1)
+        elif i == "i": r = self._get_int()
+        elif i.isdigit():
+            self._get(-1) # reeeeewind
+            r = self._get_str()
+        return r
+
+
+lines = []
+for line in fileinput.input():
+    lines.append(line)
+#print repr(''.join(lines))
+
+d=Decoder(''.join(lines))
+pprint(d.decode())




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