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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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(const void *buf, int len); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_s_mem()\fR return the memory \s-1BIO\s0 method function. .PP A memory \s-1BIO\s0 is a source/sink \s-1BIO\s0 which uses memory for its I/O. Data written to a memory \s-1BIO\s0 is stored in a \s-1BUF_MEM\s0 structure which is extended as appropriate to accommodate the stored data. .PP Any data written to a memory \s-1BIO\s0 can be recalled by reading from it. Unless the memory \s-1BIO\s0 is read only any data read from it is deleted from the \s-1BIO.\s0 .PP Memory BIOs support \fBBIO_gets()\fR and \fBBIO_puts()\fR. .PP If the \s-1BIO_CLOSE\s0 flag is set when a memory \s-1BIO\s0 is freed then the underlying \&\s-1BUF_MEM\s0 structure is also freed. .PP Calling \fBBIO_reset()\fR on a read write memory \s-1BIO\s0 clears any data in it. On a read only \s-1BIO\s0 it restores the \s-1BIO\s0 to its original state and the read only data can be read again. .PP \&\fBBIO_eof()\fR is true if no data is in the \s-1BIO.\s0 .PP \&\fBBIO_ctrl_pending()\fR returns the number of bytes currently stored. .PP \&\fBBIO_set_mem_eof_return()\fR sets the behaviour of memory \s-1BIO\s0 \fBb\fR when it is empty. If the \fBv\fR is zero then an empty memory \s-1BIO\s0 will return \s-1EOF\s0 (that is it will return zero and BIO_should_retry(b) will be false. If \fBv\fR is non zero then it will return \fBv\fR 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 \fBv\fR should be set to a negative value, typically \-1. .PP \&\fBBIO_get_mem_data()\fR sets *\fBpp\fR 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. .PP \&\fBBIO_set_mem_buf()\fR sets the internal \s-1BUF_MEM\s0 structure to \fBbm\fR and sets the close flag to \fBc\fR, that is \fBc\fR should be either \s-1BIO_CLOSE\s0 or \s-1BIO_NOCLOSE.\s0 It is a macro. .PP \&\fBBIO_get_mem_ptr()\fR places the underlying \s-1BUF_MEM\s0 structure in *\fBpp\fR. It is a macro. .PP \&\fBBIO_new_mem_buf()\fR creates a memory \s-1BIO\s0 using \fBlen\fR bytes of data at \fBbuf\fR, if \fBlen\fR is \-1 then the \fBbuf\fR is assumed to be nul terminated and its length is determined by \fBstrlen\fR. The \s-1BIO\s0 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 \s-1BIO.\s0 The supplied data is read directly from the supplied buffer: it is \fBnot\fR copied first, so the supplied area of memory must be unchanged until the \s-1BIO\s0 is freed. .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability library/security/openssl = Stability Pass-through uncommitted .TE .PP .SH "NOTES" .IX Header "NOTES" Writes to memory BIOs will always succeed if memory is available: that is their size can grow indefinitely. .PP Every read from a read write memory \s-1BIO\s0 will remove the data just read with an internal copy operation, if a \s-1BIO\s0 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 \s-1BIO\s0 avoids this problem. If the \s-1BIO\s0 must be read write then adding a buffering \s-1BIO\s0 to the chain will speed up the process. .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://www.openssl.org/source/openssl-1.0.2zi.tar.gz. Further information about this software can be found on the open source community website at https://www.openssl.org/. .SH "BUGS" .IX Header "BUGS" There should be an option to set the maximum size of a memory \s-1BIO.\s0 .PP There should be a way to \*(L"rewind\*(R" a read write \s-1BIO\s0 without destroying its contents. .PP The copying operation should not occur after every small read of a large \s-1BIO\s0 to improve efficiency. .SH "EXAMPLE" .IX Header "EXAMPLE" Create a memory \s-1BIO\s0 and write some data to it: .PP .Vb 2 \& BIO *mem = BIO_new(BIO_s_mem()); \& BIO_puts(mem, "Hello World\en"); .Ve .PP Create a read only memory \s-1BIO:\s0 .PP .Vb 3 \& char data[] = "Hello World"; \& BIO *mem; \& mem = BIO_new_mem_buf(data, \-1); .Ve .PP Extract the \s-1BUF_MEM\s0 structure from a memory \s-1BIO\s0 and then free up the \s-1BIO:\s0 .PP .Vb 4 \& 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); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\s-1TBA\s0