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124 .\" ========================================================================
126 .IX Title "BIO_f_buffer 3"
127 .TH BIO_f_buffer 3 "2011-09-06" "1.0.0e" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 BIO_f_buffer \- buffering BIO
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/bio.h>
139 \& BIO_METHOD * BIO_f_buffer(void);
141 \& #define BIO_get_buffer_num_lines(b) BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
142 \& #define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
143 \& #define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
144 \& #define BIO_set_buffer_size(b,size) BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
145 \& #define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
148 .IX Header "DESCRIPTION"
149 \&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
151 Data written to a buffering \s-1BIO\s0 is buffered and periodically written
152 to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
153 an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
154 Both \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported.
156 Calling \fIBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
158 \&\fIBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
160 \&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
161 set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
162 buffer size is \s-1DEFAULT_BUFFER_SIZE\s0, currently 4096. Any attempt to reduce the
163 buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
164 when the buffer is resized.
166 \&\fIBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
167 bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
171 Buffering BIOs implement \fIBIO_gets()\fR by using \fIBIO_read()\fR operations on the
172 next \s-1BIO\s0 in the chain. By prepending a buffering \s-1BIO\s0 to a chain it is therefore
173 possible to provide \fIBIO_gets()\fR functionality if the following BIOs do not
174 support it (for example \s-1SSL\s0 BIOs).
176 Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
177 or when \fIBIO_flush()\fR is called. It is therefore important to call \fIBIO_flush()\fR
178 whenever any pending data should be written such as when removing a buffering
179 \&\s-1BIO\s0 using \fIBIO_pop()\fR. \fIBIO_flush()\fR may need to be retried if the ultimate
180 source/sink \s-1BIO\s0 is non blocking.
182 .IX Header "RETURN VALUES"
183 \&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
185 \&\fIBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
187 \&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
188 return 1 if the buffer was successfully resized or 0 for failure.
190 \&\fIBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
193 .IX Header "SEE ALSO"
194 \&\s-1\fIBIO\s0\fR\|(3),
195 \&\fIBIO_reset\fR\|(3),
196 \&\fIBIO_flush\fR\|(3),
197 \&\fIBIO_pop\fR\|(3),
198 \&\fIBIO_ctrl\fR\|(3),
199 \&\fIBIO_int_ctrl\fR\|(3)