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osmocom.construct: Don't forget context when calling sizeof in Rpad

When calling the self.sizeof() method, we must pass in the context
in order to make expressions like 'this._.total_len' work.

Change-Id: I97e4b8fffcccba0b9d0ecb18c76a2a30fd990fd2
---
M src/osmocom/construct.py
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/python/pyosmocom refs/changes/86/38186/1

diff --git a/src/osmocom/construct.py b/src/osmocom/construct.py
index 753b5de..8f01f3c 100644
--- a/src/osmocom/construct.py
+++ b/src/osmocom/construct.py
@@ -341,7 +341,7 @@
         return obj.rstrip(self.pattern)
 
     def _encode(self, obj, context, path):
-        target_size = self.sizeof() * self.num_per_byte
+        target_size = self.sizeof(**context) * self.num_per_byte
         if len(obj) > target_size:
             raise SizeofError("Input ({}) exceeds target size ({})".format(
                 len(obj), target_size))

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