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-=pod
-
-=head1 NAME
-
-BIO_push, BIO_pop - add and remove BIOs from a chain.
-
-=head1 SYNOPSIS
-
- #include <openssl/bio.h>
-
- BIO *	BIO_push(BIO *b,BIO *append);
- BIO *	BIO_pop(BIO *b);
-
-=head1 DESCRIPTION
-
-The BIO_push() function appends the BIO B<append> to B<b>, it returns
-B<b>.
-
-BIO_pop() removes the BIO B<b> from a chain and returns the next BIO
-in the chain, or NULL if there is no next BIO. The removed BIO then
-becomes a single BIO with no association with the original chain,
-it can thus be freed or attached to a different chain.
-
-=head1 NOTES
-
-The names of these functions are perhaps a little misleading. BIO_push()
-joins two BIO chains whereas BIO_pop() deletes a single BIO from a chain,
-the deleted BIO does not need to be at the end of a chain.
-
-The process of calling BIO_push() and BIO_pop() on a BIO may have additional
-consequences (a control call is made to the affected BIOs) any effects will
-be noted in the descriptions of individual BIOs.
-
-=head1 EXAMPLES
-
-For these examples suppose B<md1> and B<md2> are digest BIOs, B<b64> is
-a base64 BIO and B<f> is a file BIO.
-
-If the call:
-
- BIO_push(b64, f);
-
-is made then the new chain will be B<b64-chain>. After making the calls
-
- BIO_push(md2, b64);
- BIO_push(md1, md2);
-
-the new chain is B<md1-md2-b64-f>. Data written to B<md1> will be digested
-by B<md1> and B<md2>, B<base64> encoded and written to B<f>.
-
-It should be noted that reading causes data to pass in the reverse
-direction, that is data is read from B<f>, base64 B<decoded> and digested
-by B<md1> and B<md2>. If the call:
-
- BIO_pop(md2);
-
-The call will return B<b64> and the new chain will be B<md1-b64-f> data can
-be written to B<md1> as before.
-
-=head1 RETURN VALUES
-
-BIO_push() returns the end of the chain, B<b>.
-
-BIO_pop() returns the next BIO in the chain, or NULL if there is no next
-BIO.
-
-=head1 SEE ALSO
-
-TBA