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Regex'ing null bytes


I'm trying to parse some binary data with regexes. It works well in
the latest Python build, but I need to run this on Python 1.5.2. The
binary data has a pattern like this:

keyName1\002..( .*)\000.*keyNam e2\002..(.*)\00 0
(I'm using regex syntax to illustrate)

So I wrote the following script:

def amfKey(str):
return "%s\002..([^\000]*)" % str

keys = re.compile(amfK ey("key"), re.DOTALL).find all(amfStr)

Works on 2.3.3, but produces the following error on 1.5.2:

Traceback (innermost last):
File "test.py", line 26, in ?
keys = re.compile(amfK ey("key"), re.DOTALL).find all(amfStr)
File "C:\Python152\L ib\re.py", line 79, in compile
code=pcre_compi le(pattern, flags, groupindex)
TypeError: argument 1: expected string without null bytes, string found

Does anyone know a workaround? The type of binary data I'm trying to
parse is AMF (Action Message Format), Macromedia's proprietary format
for fast communication between the Flash Player and their "Flash
Remoting" servers (ColdFusion/.NET/Java implementations ). But there
are opensource "Flash Remoting" implementations in PHP (amfphp.org),
Perl (simonf.com/flap/) and Java (openamf.org) already - I've
started to work on the Python port.

And I wanted to keep this Python 1.5.2-compatible...

Thanks in advance,
Jonas Galvez

Jul 18 '05 #1
0 1698

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