[crypto] Provide asn1_built() to construct a cursor from a builder
authorMichael Brown <mcb30@ipxe.org>
Tue, 13 Jun 2017 11:12:11 +0000 (12:12 +0100)
committerMichael Brown <mcb30@ipxe.org>
Tue, 20 Jun 2017 08:49:00 +0000 (09:49 +0100)
commitb506528c1e4ce70dc24da87c0f7cd16ddac60701
treefc03fd8c44ccb86c8d1775a0a23bf2864ba71711
parente5bfa107bad45ea9e0304a74f07cc0c7fc9860ae
[crypto] Provide asn1_built() to construct a cursor from a builder

Our ASN.1 parsing code uses a struct asn1_cursor, while the object
construction code uses a struct asn1_builder.  These structures are
identical apart from the const modifier applied to the data pointer in
struct asn1_cursor.

Provide asn1_built() to safely typecast a struct asn1_builder to a
struct asn1_cursor, allowing constructed objects to be passed to
functions expecting a struct asn1_cursor.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
src/include/ipxe/asn1.h