de/-encoding problem?

[seppl43]

Hello,

I'm writing a SOAP-client using SOAPpy for a JAVA-Application (JIRA).
When I try to send attachments, the incoming files are not decoded
correctly. They have about 1.5% more bytes.

What I'm doing is this:

file_obj = file(<path to file>,'rb')
cont = file_obj.read()
cont64 = base64.encodestring(cont)
chararray1 = array.array('c')
chararray1.fromstring(cont64)
file_obj.close()

# using the method of jira's SOAP-interface
add =
jira_soap.addAttachmentsToIssue(auth,issue_id,[<filename>],[chararray1])
This is the WSDL-description of that method:

<wsdl:message name="addAttachmentsToIssueRequest">
<wsdl:part name="in0" type="xsd:string"/>
<wsdl:part name="in1" type="xsd:string"/>
<wsdl:part name="in2" type="impl:ArrayOf_xsd_string"/>
<wsdl:part name="in3" type="impl:ArrayOf_xsd_base64Binary"/>
</wsdl:message>

Does anybody know, why the files are not de-/encoded correctly?
Thanks for help.

Seppl