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140 .IX Title "BIO_f_buffer 3"
141 .TH BIO_f_buffer 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 BIO_f_buffer \- buffering \s-1BIO\s0
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/bio.h>
151 \& BIO_METHOD * BIO_f_buffer(void);
154 \& #define BIO_get_buffer_num_lines(b) BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
155 \& #define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
156 \& #define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
157 \& #define BIO_set_buffer_size(b,size) BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
158 \& #define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
161 .IX Header "DESCRIPTION"
162 \&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
164 Data written to a buffering \s-1BIO\s0 is buffered and periodically written
165 to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
166 an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
167 Both \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported.
169 Calling \fIBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
171 \&\fIBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
173 \&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
174 set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
175 buffer size is \s-1DEFAULT_BUFFER_SIZE\s0, currently 1024. Any attempt to reduce the
176 buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
177 when the buffer is resized.
179 \&\fIBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
180 bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
184 Buffering BIOs implement \fIBIO_gets()\fR by using \fIBIO_read()\fR operations on the
185 next \s-1BIO\s0 in the chain. By prepending a buffering \s-1BIO\s0 to a chain it is therefore
186 possible to provide \fIBIO_gets()\fR functionality if the following BIOs do not
187 support it (for example \s-1SSL\s0 BIOs).
189 Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
190 or when \fIBIO_flush()\fR is called. It is therefore important to call \fIBIO_flush()\fR
191 whenever any pending data should be written such as when removing a buffering
192 \&\s-1BIO\s0 using \fIBIO_pop()\fR. \fIBIO_flush()\fR may need to be retried if the ultimate
193 source/sink \s-1BIO\s0 is non blocking.
195 .IX Header "RETURN VALUES"
196 \&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
198 \&\fIBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
200 \&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
201 return 1 if the buffer was successfully resized or 0 for failure.
203 \&\fIBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
206 .IX Header "SEE ALSO"