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__module__t __doc__( ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR " s t HTTPRangeHandlerc B s e Z d Z d „ Z d „ Z RS( sº Handler that enables HTTP Range headers.
This was extremely simple. The Range header is a HTTP feature to
begin with so all this class does is tell urllib2 that the
"206 Partial Content" reponse from the HTTP server is what we
expected.
Example:
import urllib2
import byterange
range_handler = range.HTTPRangeHandler()
opener = urllib2.build_opener(range_handler)
# install it
urllib2.install_opener(opener)
# create Request and set Range header
req = urllib2.Request('http://www.python.org/')
req.header['Range'] = 'bytes=30-50'
f = urllib2.urlopen(req)
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R ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR O s ( R R R R R ( ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR I s t RangeableFileObjectc B sh e Z d Z d „ Z d „ Z d „ Z d d „ Z d d „ Z d d „ Z d „ Z d
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d „ Z RS( s" File object wrapper to enable raw range handling.
This was implemented primarilary for handling range
specifications for file:// urls. This object effectively makes
a file object look like it consists only of a range of bytes in
the stream.
Examples:
# expose 10 bytes, starting at byte position 20, from
# /etc/aliases.
>>> fo = RangeableFileObject(file('/etc/passwd', 'r'), (20,30))
# seek seeks within the range (to position 23 in this case)
>>> fo.seek(3)
# tell tells where your at _within the range_ (position 3 in
# this case)
>>> fo.tell()
# read EOFs if an attempt is made to read past the last
# byte in the range. the following will return only 7 bytes.
>>> fo.read(30)
c C s> | | _ t | ƒ \ | _ | _ d | _ | i | i ƒ d S( s Create a RangeableFileObject.
fo -- a file like object. only the read() method need be
supported but supporting an optimized seek() is
preferable.
rangetup -- a (firstbyte,lastbyte) tuple specifying the range
to work over.
The file object provided is assumed to be at byte offset 0.
i N( t fot range_tuple_normalizet firstbytet lastbytet realpost _do_seek( R R t rangetup( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyt __init__g s c C s1 t | i | ƒ o t | i | ƒ St | ‚ d S( s« This effectively allows us to wrap at the instance level.
Any attribute not found in _this_ object will be searched for
in self.fo. This includes methods.N( t hasattrR t getattrt AttributeError( R t name( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyt __getattr__u s c C s | i | i S( s5 Return the position within the range.
This is different from fo.seek in that position 0 is the
first byte position of the range tuple. For example, if
this object was created with a range tuple of (500,899),
tell() will return 0 when at byte position 500 of the file.
( R R ( R ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyt tell} s i c C s¬ | d j p t ‚ | d j o | i | } n< | d j o | i | } n | d j o t d ƒ ‚ n | i o | | i j o
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Positioning is identical to that described under tell().
i i i s$ seek from end of file not supported.N( i i i ( t AssertionErrorR R t IOErrorR R ( R t offsett whencet
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iÿÿÿÿc C s: | i | ƒ } | i i | ƒ } | i t | ƒ 7_ | S( s` Read within the range.
This method will limit the size read based on the range.
( t _calc_read_sizeR t readR t len( R t sizet rslt( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR+ ™ s c C s: | i | ƒ } | i i | ƒ } | i t | ƒ 7_ | S( sf Read lines within the range.
This method will limit the size read based on the range.
( R* R t readlineR R, ( R R- R. ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR/ ¢ s c C s^ | i oP | d j o/ | i | | i j o | i | i } qV qZ | i | i } n | S( sS Handles calculating the amount of data to read based on
the range.
iÿÿÿÿ( R R ( R R- ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR* « s
c C sb | d j p t ‚ t | i d ƒ p | i | ƒ n | i i | i | ƒ | i | 7_ d S( s Seek based on whether wrapped object supports seek().
offset is relative to the current position (self.realpos).
i R) N( R$ R R t _poor_mans_seekR) R ( R R& ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR · s
c C sƒ d } d } xp | | j ob | | | j o | | } n | i i | ƒ } t | ƒ | j o t d ƒ ‚ n | | 7} q Wd S( s¯ Seek by calling the wrapped file objects read() method.
This is used for file like objects that do not have native
seek support. The wrapped objects read() method is called
to manually seek to the desired position.
offset -- read this number of bytes from the wrapped
file object.
raise RangeError if we encounter EOF before reaching the
specified offset.
i i s Requested Range Not SatisfiableN( R R+ R, R ( R R& t post bufsizet buf( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR0 Â s
( R R R R R" R# R) R+ R/ R* R R0 ( ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyR R s t FileRangeHandlerc B s e Z d Z d „ Z RS( s~ FileHandler subclass that adds Range support.
This class handles Range headers exactly like an HTTP
server would.
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Range headers have the form "bytes=-". This
function pulls the firstbyte and lastbyte values and returns
a (firstbyte,lastbyte) tuple. If lastbyte is not specified in
the header value, it is returned as an empty string in the
tuple.
Return None if range_header is None
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pattern.
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c C sY | d j o d St | ƒ } | o0 | d o | d | d d f } n d | Sd S( s• Convert a range tuple to a Range header value.
Return a string of the form "bytes=-" or None
if no range is needed.
i i s bytes=%s-%sN( RM R ( R ( ( s8 /usr/lib/python2.6/site-packages/urlgrabber/byterange.pyt range_tuple_to_header¬ s
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d } n | d j o t | ƒ } n | | f d j o d S| | j o t d | | f ƒ ‚ n | | f S( s7 Normalize a (first_byte,last_byte) range tuple.
Return a tuple whose first element is guaranteed to be an int
and whose second element will be '' (meaning: the last byte) or
an int. Finally, return None if the normalized tuple == (0,'')
as that is equivelant to retrieving the entire file.
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