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Edit File : BIO_get_buffer_num_lines.3 \| Size : 7.89 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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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_get_buffer_num_lines, BIO_set_read_buffer_size, BIO_set_write_buffer_size, BIO_set_buffer_size, BIO_set_buffer_read_data, BIO_f_buffer \&\- buffering BIO .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bio.h> \& \& const BIO_METHOD BIO_f_buffer(void); \& \& long BIO_get_buffer_num_lines(BIO b); \& long BIO_set_read_buffer_size(BIO b, long size); \& long BIO_set_write_buffer_size(BIO b, long size); \& long BIO_set_buffer_size(BIO b, long size); \& long BIO_set_buffer_read_data(BIO b, void buf, long num); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method. .PP Data written to a buffering \s-1BIO\s0 is buffered and periodically written to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from an internal buffer which is filled from the next \s-1BIO\s0 in the chain. Both \fBBIO_gets()\fR and \fBBIO_puts()\fR are supported. .PP Calling \fBBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data. .PP \&\fBBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered. .PP \&\fBBIO_set_read_buffer_size()\fR, \fBBIO_set_write_buffer_size()\fR and \fBBIO_set_buffer_size()\fR set the read, write or both read and write buffer sizes to \fBsize\fR. The initial buffer size is \s-1DEFAULT_BUFFER_SIZE,\s0 currently 4096. Any attempt to reduce the buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared when the buffer is resized. .PP \&\fBBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer is expanded. .SH "NOTES" .IX Header "NOTES" These functions, other than \fBBIO_f_buffer()\fR, are implemented as macros. .PP Buffering BIOs implement \fBBIO_read_ex()\fR and \fBBIO_gets()\fR by using \&\fBBIO_read_ex()\fR operations on the next \s-1BIO\s0 in the chain and storing the result in an internal buffer, from which bytes are given back to the caller as appropriate for the call; a \fBBIO_gets()\fR is guaranteed to give the caller a whole line, and \fBBIO_read_ex()\fR is guaranteed to give the caller the number of bytes it asks for, unless there's an error or end of communication is reached in the next \s-1BIO.\s0 By prepending a buffering \s-1BIO\s0 to a chain it is therefore possible to provide \&\fBBIO_gets()\fR or exact size \fBBIO_read_ex()\fR functionality if the following BIOs do not support it. .PP Do not add more than one \fBBIO_f_buffer()\fR to a \s-1BIO\s0 chain. The result of doing so will force a full read of the size of the internal buffer of the top \fBBIO_f_buffer()\fR, which is 4 KiB at a minimum. .PP Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills or when \fBBIO_flush()\fR is called. It is therefore important to call \fBBIO_flush()\fR whenever any pending data should be written such as when removing a buffering \&\s-1BIO\s0 using \fBBIO_pop()\fR. \fBBIO_flush()\fR may need to be retried if the ultimate source/sink \s-1BIO\s0 is non blocking. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method. .PP \&\fBBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0). .PP \&\fBBIO_set_read_buffer_size()\fR, \fBBIO_set_write_buffer_size()\fR and \fBBIO_set_buffer_size()\fR return 1 if the buffer was successfully resized or 0 for failure. .PP \&\fBBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if there was an error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbio\fR\\|(7), \&\fBBIO_reset\fR\\|(3), \&\fBBIO_flush\fR\\|(3), \&\fBBIO_pop\fR\\|(3), \&\fBBIO_ctrl\fR\\|(3). .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

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.\" ========================================================================
.\"
.IX Title "BIO_F_BUFFER 3"
.TH BIO_F_BUFFER 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BIO_get_buffer_num_lines, BIO_set_read_buffer_size, BIO_set_write_buffer_size, BIO_set_buffer_size, BIO_set_buffer_read_data, BIO_f_buffer \&\- buffering BIO
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bio.h>
\&
\& const BIO_METHOD *BIO_f_buffer(void);
\&
\& long BIO_get_buffer_num_lines(BIO *b);
\& long BIO_set_read_buffer_size(BIO *b, long size);
\& long BIO_set_write_buffer_size(BIO *b, long size);
\& long BIO_set_buffer_size(BIO *b, long size);
\& long BIO_set_buffer_read_data(BIO *b, void *buf, long num);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
.PP
Data written to a buffering \s-1BIO\s0 is buffered and periodically written
to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
Both \fBBIO_gets()\fR and \fBBIO_puts()\fR are supported.
.PP
Calling \fBBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
.PP
\&\fBBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
.PP
\&\fBBIO_set_read_buffer_size()\fR, \fBBIO_set_write_buffer_size()\fR and \fBBIO_set_buffer_size()\fR
set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
buffer size is \s-1DEFAULT_BUFFER_SIZE,\s0 currently 4096. Any attempt to reduce the
buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
when the buffer is resized.
.PP
\&\fBBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
is expanded.
.SH "NOTES"
.IX Header "NOTES"
These functions, other than \fBBIO_f_buffer()\fR, are implemented as macros.
.PP
Buffering BIOs implement \fBBIO_read_ex()\fR and \fBBIO_gets()\fR by using
\&\fBBIO_read_ex()\fR operations on the next \s-1BIO\s0 in the chain and storing the
result in an internal buffer, from which bytes are given back to the
caller as appropriate for the call; a \fBBIO_gets()\fR is guaranteed to give
the caller a whole line, and \fBBIO_read_ex()\fR is guaranteed to give the
caller the number of bytes it asks for, unless there's an error or end
of communication is reached in the next \s-1BIO.\s0  By prepending a
buffering \s-1BIO\s0 to a chain it is therefore possible to provide
\&\fBBIO_gets()\fR or exact size \fBBIO_read_ex()\fR functionality if the following
BIOs do not support it.
.PP
Do not add more than one \fBBIO_f_buffer()\fR to a \s-1BIO\s0 chain.  The result of
doing so will force a full read of the size of the internal buffer of
the top \fBBIO_f_buffer()\fR, which is 4 KiB at a minimum.
.PP
Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
or when \fBBIO_flush()\fR is called. It is therefore important to call \fBBIO_flush()\fR
whenever any pending data should be written such as when removing a buffering
\&\s-1BIO\s0 using \fBBIO_pop()\fR. \fBBIO_flush()\fR may need to be retried if the ultimate
source/sink \s-1BIO\s0 is non blocking.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
.PP
\&\fBBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
.PP
\&\fBBIO_set_read_buffer_size()\fR, \fBBIO_set_write_buffer_size()\fR and \fBBIO_set_buffer_size()\fR
return 1 if the buffer was successfully resized or 0 for failure.
.PP
\&\fBBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
there was an error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBbio\fR\|(7),
\&\fBBIO_reset\fR\|(3),
\&\fBBIO_flush\fR\|(3),
\&\fBBIO_pop\fR\|(3),
\&\fBBIO_ctrl\fR\|(3).
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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