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Allow caller to pass total_len in context of osmocom.construct.build_construct

The current code hard-coded 'total_len' as None during build_construct,
which prevented the caller from passing a different value in the
context.  Let's change it in a way that the default remains None, but
the caller can override it.  This is useful for pySim size computations
that depend on the target size of the file/record.

Change-Id: I7c4eab60274bcb0dd95e7bc21867a37ad70e4fc0
---
M src/osmocom/construct.py
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/python/pyosmocom refs/changes/87/38187/1

diff --git a/src/osmocom/construct.py b/src/osmocom/construct.py
index 8f01f3c..def5d85 100644
--- a/src/osmocom/construct.py
+++ b/src/osmocom/construct.py
@@ -492,7 +492,8 @@
 
 def build_construct(c, decoded_data, context: dict = {}):
     """Helper function to handle total_len."""
-    return c.build(decoded_data, total_len=None, **context)
+    context.setdefault('total_len', None)
+    return c.build(decoded_data, **context)
 
 # here we collect some shared / common definitions of data types
 LV = Prefixed(Int8ub, HexAdapter(GreedyBytes))

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