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131 .IX Title "BIO_f_buffer 3"
132 .TH BIO_f_buffer 3 "2017-12-07" "1.0.2n" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 BIO_f_buffer \- buffering BIO
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/bio.h>
144 \& BIO_METHOD * BIO_f_buffer(void);
146 \& #define BIO_get_buffer_num_lines(b) BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
147 \& #define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
148 \& #define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
149 \& #define BIO_set_buffer_size(b,size) BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
150 \& #define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
153 .IX Header "DESCRIPTION"
154 \&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
156 Data written to a buffering \s-1BIO\s0 is buffered and periodically written
157 to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
158 an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
159 Both \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported.
161 Calling \fIBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
163 \&\fIBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
165 \&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
166 set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
167 buffer size is \s-1DEFAULT_BUFFER_SIZE,\s0 currently 4096. Any attempt to reduce the
168 buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
169 when the buffer is resized.
171 \&\fIBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
172 bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
176 Buffering BIOs implement \fIBIO_gets()\fR by using \fIBIO_read()\fR operations on the
177 next \s-1BIO\s0 in the chain. By prepending a buffering \s-1BIO\s0 to a chain it is therefore
178 possible to provide \fIBIO_gets()\fR functionality if the following BIOs do not
179 support it (for example \s-1SSL\s0 BIOs).
181 Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
182 or when \fIBIO_flush()\fR is called. It is therefore important to call \fIBIO_flush()\fR
183 whenever any pending data should be written such as when removing a buffering
184 \&\s-1BIO\s0 using \fIBIO_pop()\fR. \fIBIO_flush()\fR may need to be retried if the ultimate
185 source/sink \s-1BIO\s0 is non blocking.
187 .IX Header "RETURN VALUES"
188 \&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
190 \&\fIBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
192 \&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
193 return 1 if the buffer was successfully resized or 0 for failure.
195 \&\fIBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
198 .IX Header "SEE ALSO"
199 \&\s-1\fIBIO\s0\fR\|(3),
200 \&\fIBIO_reset\fR\|(3),
201 \&\fIBIO_flush\fR\|(3),
202 \&\fIBIO_pop\fR\|(3),
203 \&\fIBIO_ctrl\fR\|(3),
204 \&\fIBIO_int_ctrl\fR\|(3)