[#ASN1_d2i_bio]
= ASN1_d2i_bio
:mrdocs:

Decode an ASN.1 value from a BIO using allocator and d2i callbacks.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void*
ASN1_d2i_bio(
    void*(* xnew)(),
    xref:d2i_of_void.adoc[d2i_of_void]* d2i,
    xref:BIO.adoc[BIO]* in,
    void** x);
----

== Return Value

Decoded object pointer, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *xnew*
| Allocator returning a new empty object (for example TYPE_new).
| *d2i*
| Decoder of type d2i_of_void that parses DER into the object.
| *in*
| BIO positioned at DER (or BER) encoding.
| *x*
| Optional destination pointer updated to the decoded object, or NULL.
|===


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