s=str(binary)

gert gert.cuykens at gmail.com
Wed Jan 21 00:21:36 CET 2009


On Jan 20, 9:41 pm, John Machin <sjmac... at lexicon.net> wrote:
> On Jan 21, 5:31 am, gert <gert.cuyk... at gmail.com> wrote:
>
> > On Jan 20, 5:23 am, John Machin <sjmac... at lexicon.net> wrote:
>
> > > On Jan 20, 12:54 pm, gert <gert.cuyk... at gmail.com> wrote:
>
> > > > How do you convert s back to binary data in python 3 so I can put in a
> > > > sqlite blob ?
> > > > Is there a build in function or do I need to use binascii ?
> > > > byte(s) or bin(s) would make more sense but can not figure it out ?
>
> > > Can't imagine why you would do str(binary_data) especially if you want
> > > it back again ... however:
>
> > def application(environ, response):
> >     s = str(environ['wsgi.input'].read())
> >     b = compile('boundary=(.*)').search(environ['CONTENT_TYPE']).group
> > (1)
> >     p = compile(r'.*Content-Type: application/octet-stream\\r\\n\\r\\n
> > (.*)\\r\\n--'+b+'.*'+b+'--', DOTALL).match(s).group(1)
> >     db.execute('UPDATE users SET picture=? WHERE uid=?',
> > (p,session.UID))
>
>
> (a) don't write obfuscatory code :-0
>
> E.g.
> (1) re.compile(pattern).search(data) -> re.search(pattern, data)
> (2) re.compile(pattern).match(data) -> re.match(pattern, data)
> (3) re.match('.*blahblah', data) -> re.search('blahblah', data)
>
> (b) don't use re when ordinary str or bytes methods will do
>
> E.g. instead of:
> b = re.search('boundary=(.*)'), environ['CONTENT_TYPE']).group(1)
> try
> b = environ['CONTENT_TYPE'].split('boundary=')[1]
>
> (c) Is that code meant to be rough pseudocode to illustrate what you
> are trying to do, or is it meant to be working code? If the latter:
> * Do you have this working in 2.X?

yep

> * Are you sure the pattern to retrieve the picture is correct?

yep http://91.121.53.159/file.txt

> * What is the "Content-Transfer-Encoding"?

print (environ['Content-Transfer-Encoding'],file=sys.stderr)
Key error flash 10 does not send it ?

> (d) Surely there must be a library somewhere that parses that kind of
> data for you ...

p = FieldStorage(fp=environ['wsgi.input'], environ=environ)
In python 3 you get TypeError: Can't convert 'bytes' object to str
implicitly

> (e) if all else fails, I'd suggest:
>
> instead of s = str(binary)
> do s = binary.decode('latin1')
> # this won't change the number of characters and will allow
> # reconstitution of your non-ascii bytes
> Then do your DIY parsing
> then at the end do
> blob = p.encode('latin1')
> # blob will be type bytes which is presumably what the database
> expects

Victory :)
http://91.121.53.159/appwsgi/www/register/register.htm
http://code.google.com/p/appwsgi/source/browse/trunk

from db import Db
from session import Session
from re import search,match,DOTALL

def application(environ, response):
    db = Db()
    cookie = "SID="+environ['QUERY_STRING']
    session = Session(db,cookie,'guest')
    response('200 OK', [('Content-type', 'text/xml'), ('Set-Cookie',
session.COOKIE)])
    if not session.GID : return []
    s = environ['wsgi.input'].read().decode('latin1')
    b = search(r'boundary=(.*)',environ['CONTENT_TYPE']).group(1)
    p = search(r'Content-Type: application/octet-stream\r\n\r\n(.*)\r
\n--',s,DOTALL).group(1)
    db.execute('UPDATE users SET picture=? WHERE uid=?',(p.encode
('latin1'),session.UID))
    xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
    xml+= "<root>"+str(db.ERROR)+"</root>"
    response('200 OK', [('Content-type', 'text/xml')])
    return [xml]







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