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[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>
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