212 lines
6.8 KiB
Groff
212 lines
6.8 KiB
Groff
.\" $NetBSD: BIO_f_buffer.3,v 1.9 2004/03/20 21:48:45 groo Exp $
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.\" ======================================================================
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.\"
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.IX Title "BIO_f_buffer 3"
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.TH BIO_f_buffer 3 "0.9.7d" "2001-04-11" "OpenSSL"
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.UC
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.SH "NAME"
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BIO_f_buffer \- buffering \s-1BIO\s0
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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.Ve
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.Vb 1
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\& BIO_METHOD * BIO_f_buffer(void);
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.Ve
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.Vb 5
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\& #define BIO_get_buffer_num_lines(b) BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
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\& #define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
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\& #define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
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\& #define BIO_set_buffer_size(b,size) BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
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\& #define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
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.PP
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Data written to a buffering \s-1BIO\s0 is buffered and periodically written
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to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
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an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
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Both \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported.
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.PP
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Calling \fIBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
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.PP
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\&\fIBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
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.PP
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\&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
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set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
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buffer size is \s-1DEFAULT_BUFFER_SIZE\s0, currently 1024. Any attempt to reduce the
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buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
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when the buffer is resized.
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.PP
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\&\fIBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
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bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
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is expanded.
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.SH "NOTES"
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.IX Header "NOTES"
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Buffering BIOs implement \fIBIO_gets()\fR by using \fIBIO_read()\fR operations on the
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next \s-1BIO\s0 in the chain. By prepending a buffering \s-1BIO\s0 to a chain it is therefore
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possible to provide \fIBIO_gets()\fR functionality if the following BIOs do not
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support it (for example \s-1SSL\s0 BIOs).
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.PP
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Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
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or when \fIBIO_flush()\fR is called. It is therefore important to call \fIBIO_flush()\fR
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whenever any pending data should be written such as when removing a buffering
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\&\s-1BIO\s0 using \fIBIO_pop()\fR. \fIBIO_flush()\fR may need to be retried if the ultimate
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source/sink \s-1BIO\s0 is non blocking.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
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.PP
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\&\fIBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
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.PP
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\&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
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return 1 if the buffer was successfully resized or 0 for failure.
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.PP
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\&\fIBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
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there was an error.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1TBA\s0
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