1 # httprangereader.py - just what it says

     2 #

     3 # Copyright 2005 Matt Mackall <mpm@selenic.com>

     4 #

     5 # This software may be used and distributed according to the terms

     6 # of the GNU General Public License, incorporated herein by reference.

     7 

     8 import byterange, urllib2

     9 

    10 class httprangereader:

    11     def __init__(self, url):

    12         self.url = url

    13         self.pos = 0

    14     def seek(self, pos):

    15         self.pos = pos

    16     def read(self, bytes=None):

    17         opener = urllib2.build_opener(byterange.HTTPRangeHandler())

    18         urllib2.install_opener(opener)

    19         req = urllib2.Request(self.url)

    20         end = ''

    21         if bytes: end = self.pos + bytes

    22         req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))

    23         f = urllib2.urlopen(req)

    24         return f.read()