115 lines
3.8 KiB
Text
115 lines
3.8 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
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>
|
|
|
|
BIO_METHOD * BIO_s_mem(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(void *buf, int len);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
BIO_s_mem() return 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.
|
|
|
|
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. On a
|
|
read only BIO it restores the BIO to its original state and the read only
|
|
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 behavior 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 null 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 lots 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.
|
|
|
|
=head1 BUGS
|
|
|
|
There should be an option to set the maximum size of a memory BIO.
|
|
|
|
There should be a way to "rewind" a read write BIO without destroying
|
|
its contents.
|
|
|
|
The copying operation should not occur after every small read of a large BIO
|
|
to improve efficiency.
|
|
|
|
=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;
|
|
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 SEE ALSO
|
|
|
|
TBA
|