package/python-construct: new package

construct is a Python library for declarative serialization/
deserialization of structured binary data.

Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_construct.py

@@ -0,0 +1,16 @@
+# Inspired from https://construct.readthedocs.io/en/latest/intro.html#example
+import construct
+
+format = construct.Struct(
+    "signature" / construct.Const(b"BMP"),
+    "width" / construct.Int8ub,
+    "height" / construct.Int8ub,
+    "pixels" / construct.Array(construct.this.width * construct.this.height, construct.Byte),
+)
+a = format.build(dict(width=3,height=2,pixels=[7,8,9,11,12,13]))
+assert(a == b'BMP\x03\x02\x07\x08\t\x0b\x0c\r')
+b = format.parse(b'BMP\x03\x02\x07\x08\t\x0b\x0c\r')
+assert(b.signature == b'BMP')
+assert(b.width == 3)
+assert(b.height == 2)
+assert(b.pixels == [7, 8, 9, 11, 12, 13])