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=pod
=head1 NAME
BIO_s_secmem,
BIO_s_mem, BIO_set_mem_eof_return, BIO_get_mem_data, BIO_set_mem_buf,
BIO_get_mem_ptr, BIO_new_mem_buf - memory BIO
=head1 SYNOPSIS
#include <openssl/bio.h>
const BIO_METHOD *BIO_s_mem(void);
const BIO_METHOD *BIO_s_secmem(void);
BIO_set_mem_eof_return(BIO *b, int v)
long BIO_get_mem_data(BIO *b, char **pp)
BIO_set_mem_buf(BIO *b, BUF_MEM *bm, int c)
BIO_get_mem_ptr(BIO *b, BUF_MEM **pp)
BIO *BIO_new_mem_buf(const void *buf, int len);
=head1 DESCRIPTION
BIO_s_mem() returns the memory BIO method function.
A memory BIO is a source/sink BIO which uses memory for its I/O. Data
written to a memory BIO is stored in a BUF_MEM structure which is extended
as appropriate to accommodate the stored data.
BIO_s_secmem() is like BIO_s_mem() except that the secure heap is used
for buffer storage.
Any data written to a memory BIO can be recalled by reading from it.
Unless the memory BIO is read only any data read from it is deleted from
the BIO.
Memory BIOs support BIO_gets() and BIO_puts().
If the BIO_CLOSE flag is set when a memory BIO is freed then the underlying
BUF_MEM structure is also freed.
Calling BIO_reset() on a read write memory BIO clears any data in it if the
flag BIO_FLAGS_NONCLEAR_RST is not set. On a read only BIO or if the flag
BIO_FLAGS_NONCLEAR_RST is set it restores the BIO to its original state and
the data can be read again.
BIO_eof() is true if no data is in the BIO.
BIO_ctrl_pending() returns the number of bytes currently stored.
BIO_set_mem_eof_return() sets the behaviour of memory BIO B<b> when it is
empty. If the B<v> is zero then an empty memory BIO will return EOF (that is
it will return zero and BIO_should_retry(b) will be false. If B<v> is non
zero then it will return B<v> when it is empty and it will set the read retry
flag (that is BIO_read_retry(b) is true). To avoid ambiguity with a normal
positive return value B<v> should be set to a negative value, typically -1.
BIO_get_mem_data() sets *B<pp> to a pointer to the start of the memory BIOs data
and returns the total amount of data available. It is implemented as a macro.
BIO_set_mem_buf() sets the internal BUF_MEM structure to B<bm> and sets the
close flag to B<c>, that is B<c> should be either BIO_CLOSE or BIO_NOCLOSE.
It is a macro.
BIO_get_mem_ptr() places the underlying BUF_MEM structure in *B<pp>. It is
a macro.
BIO_new_mem_buf() creates a memory BIO using B<len> bytes of data at B<buf>,
if B<len> is -1 then the B<buf> is assumed to be nul terminated and its
length is determined by B<strlen>. The BIO is set to a read only state and
as a result cannot be written to. This is useful when some data needs to be
made available from a static area of memory in the form of a BIO. The
supplied data is read directly from the supplied buffer: it is B<not> copied
first, so the supplied area of memory must be unchanged until the BIO is freed.
=head1 NOTES
Writes to memory BIOs will always succeed if memory is available: that is
their size can grow indefinitely.
Every read from a read write memory BIO will remove the data just read with
an internal copy operation, if a BIO contains a lot of data and it is
read in small chunks the operation can be very slow. The use of a read only
memory BIO avoids this problem. If the BIO must be read write then adding
a buffering BIO to the chain will speed up the process.
Calling BIO_set_mem_buf() on a BIO created with BIO_new_secmem() will
give undefined results, including perhaps a program crash.
=head1 BUGS
There should be an option to set the maximum size of a memory BIO.
=head1 EXAMPLE
Create a memory BIO and write some data to it:
BIO *mem = BIO_new(BIO_s_mem());
BIO_puts(mem, "Hello World\n");
Create a read only memory BIO:
char data[] = "Hello World";
BIO *mem = BIO_new_mem_buf(data, -1);
Extract the BUF_MEM structure from a memory BIO and then free up the BIO:
BUF_MEM *bptr;
BIO_get_mem_ptr(mem, &bptr);
BIO_set_close(mem, BIO_NOCLOSE); /* So BIO_free() leaves BUF_MEM alone */
BIO_free(mem);
=head1 RETURN VALUES
BIO_s_mem() and BIO_s_secmem() return a valid memory B<BIO_METHOD> structure.
BIO_set_mem_eof_return(), BIO_get_mem_data(), BIO_set_mem_buf() and BIO_get_mem_ptr()
return 1 on success or a value which is less than or equal to 0 if an error occurred.
BIO_new_mem_buf() returns a valid B<BIO> structure on success or NULL on error.
=head1 COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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