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This allows BIO_tell() and BIO_seek() to work for BIO's that do not support these methods. The main use case for this is file/fd BIO's that use stdin. This works for stdin taken from input redirection (command < file), and stdin via pipe (cat file | command). Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14407)
62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
=pod
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=head1 NAME
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BIO_f_readbuffer
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- read only buffering BIO that supports BIO_tell() and BIO_seek()
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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const BIO_METHOD *BIO_f_readbuffer(void);
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=head1 DESCRIPTION
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BIO_f_readbuffer() returns the read buffering BIO method.
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This BIO filter can be inserted on top of BIO's that do not support BIO_tell()
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or BIO_seek() (e.g. A file BIO that uses stdin).
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Data read from a read buffering BIO comes from an internal buffer which is
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filled from the next BIO in the chain.
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BIO_gets() is supported for read buffering BIOs.
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Writing data to a read buffering BIO is not supported.
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Calling BIO_reset() on a read buffering BIO does not clear any buffered data.
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=head1 NOTES
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Read buffering BIOs implement BIO_read_ex() by using BIO_read_ex() operations
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on the next BIO (e.g. a file BIO) in the chain and storing the result in an
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internal buffer, from which bytes are given back to the caller as appropriate
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for the call. BIO_read_ex() is guaranteed to give the caller the number of bytes
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it asks for, unless there's an error or end of communication is reached in the
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next BIO. The internal buffer can grow to cache the entire contents of the next
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BIO in the chain. BIO_seek() uses the internal buffer, so that it can only seek
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into data that is already read.
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=head1 RETURN VALUES
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BIO_f_readbuffer() returns the read buffering BIO method.
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=head1 SEE ALSO
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L<bio(7)>,
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L<BIO_read(3)>,
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L<BIO_gets(3)>,
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L<BIO_reset(3)>,
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L<BIO_ctrl(3)>.
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=head1 COPYRIGHT
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Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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