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Represents the Range header.
This only represents ``bytes`` ranges, which are the only kind
specified in HTTP. This can represent multiple sets of ranges,
but no place else is this multi-range facility supported.
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Returns true if this range can be satisfied by the resource
with the given byte length.
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*If* there is only one range, and *if* it is satisfiable by
the given length, then return a (begin, end) non-inclusive range
of bytes to serve. Otherwise return None
If length is None (unknown length), then the resulting range
may be (begin, None), meaning it should be served from that
point. If it's a range with a fixed endpoint we won't know if
it is satisfiable, so this will return None.
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Works like range_for_length; returns None or a ContentRange object
You can use it like::
response.content_range = req.range.content_range(response.content_length)
Though it's still up to you to actually serve that content range!
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Parse the header; may return None if header is invalid
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Parse a Range header into (bytes, list_of_ranges). Note that the
ranges are *inclusive* (like in HTTP, not like in Python
typically).
Will return None if the header is invalid
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Takes the output of parse_bytes and turns it into a header
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Converts the list-of-ranges from parse_bytes() to a Python-style
list of ranges (non-inclusive end points)
In the list of ranges, the last item can be None to indicate that
it should go to the end of the file, and the first item can be
negative to indicate that it should start from an offset from the
end. If you give a length then this will not occur (negative
numbers and offsets will be resolved).
If length is given, and any range is not value, then None is
returned.
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Converts a Python-style list of ranges to what serialize_bytes
expects.
This is the inverse of bytes_to_python_ranges
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Represents the Content-Range header
This header is ``start-stop/length``, where stop and length can be
``*`` (represented as None in the attributes).
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Mostly so you can unpack this, like:
start, stop, length = res.content_range
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Parse the header. May return None if it cannot parse.
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