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25cf949fc6
This adds OSSL_ENCODER_to_data() and OSSL_DECODER_from_data(). These functions allow fairly simple rewrites of type-specific i2d and d2i calls. Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/13094)
84 lines
2.3 KiB
Plaintext
84 lines
2.3 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_ENCODER_to_data,
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OSSL_ENCODER_to_bio,
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OSSL_ENCODER_to_fp
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- Routines to perform an encoding
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=head1 SYNOPSIS
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#include <openssl/encoder.h>
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int OSSL_ENCODER_to_data(OSSL_ENCODER_CTX *ctx, unsigned char **pdata,
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size_t *pdata_len);
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int OSSL_ENCODER_to_bio(OSSL_ENCODER_CTX *ctx, BIO *out);
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int OSSL_ENCODER_to_fp(OSSL_ENCODER_CTX *ctx, FILE *fp);
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Feature availability macros:
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=over 4
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=item OSSL_ENCODER_to_fp() is only available when B<OPENSSL_NO_STDIO>
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is undefined.
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=back
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=head1 DESCRIPTION
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OSSL_ENCODER_to_data() runs the encoding process for the context I<ctx>,
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with the output going to the I<*pdata> and I<*pdata_len>.
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If I<*pdata> is NULL when OSSL_ENCODER_to_data() is called, a buffer will be
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allocated using L<OPENSSL_zalloc(3)>, and I<*pdata> will be set to point at
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the start of that buffer, and I<*pdata_len> will be assigned its length when
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OSSL_ENCODER_to_data() returns.
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If I<*pdata> is non-NULL when OSSL_ENCODER_to_data() is called, I<*pdata_len>
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is assumed to have its size. In this case, I<*pdata> will be set to point
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after the encoded bytes, and I<*pdata_len> will be assigned the number of
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remaining bytes.
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OSSL_ENCODER_to_bio() runs the encoding process for the context I<ctx>, with
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the output going to the B<BIO> I<out>.
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OSSL_ENCODER_to_fp() does the same thing as OSSL_ENCODER_to_bio(), except
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that the output is going to the B<FILE> I<fp>.
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=for comment Know your encoder!
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For OSSL_ENCODER_to_bio() and OSSL_ENCODER_to_fp(), the application is
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required to set up the B<BIO> or B<FILE> properly, for example to have
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it in text or binary mode as is appropriate for the encoder output type.
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=head1 RETURN VALUES
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OSSL_ENCODER_to_bio(), OSSL_ENCODER_to_fp() and OSSL_ENCODER_to_data()
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return 1 on success, or 0 on failure.
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=begin comment TODO(3.0) Add examples!
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=head1 EXAMPLES
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Text, because pod2xxx doesn't like empty sections
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=end comment
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=head1 SEE ALSO
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L<provider(7)>, L<OSSL_ENCODER_CTX(3)>
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=head1 HISTORY
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The functions described here were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2020 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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