215 lines
6.2 KiB
Groff
Executable File
215 lines
6.2 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "BIO_F_BASE64 3"
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.TH BIO_F_BASE64 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_f_base64 \- base64 BIO filter
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/bio.h>
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\& #include <openssl/evp.h>
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\&
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\& const BIO_METHOD *BIO_f_base64(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_f_base64()\fR returns the base64 \s-1BIO\s0 method. This is a filter
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\&\s-1BIO\s0 that base64 encodes any data written through it and decodes
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any data read through it.
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.PP
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Base64 BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR.
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.PP
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\&\fIBIO_flush()\fR on a base64 \s-1BIO\s0 that is being written through is
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used to signal that no more data is to be encoded: this is used
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to flush the final block through the \s-1BIO\s0.
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.PP
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The flag \s-1BIO_FLAGS_BASE64_NO_NL\s0 can be set with \fIBIO_set_flags()\fR
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to encode the data all on one line or expect the data to be all
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on one line.
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.SH "NOTES"
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.IX Header "NOTES"
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Because of the format of base64 encoding the end of the encoded
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block cannot always be reliably determined.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBIO_f_base64()\fR returns the base64 \s-1BIO\s0 method.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Base64 encode the string \*(L"Hello World\en\*(R" and write the result
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to standard output:
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.PP
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.Vb 2
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\& BIO *bio, *b64;
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\& char message[] = "Hello World \en";
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\&
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\& b64 = BIO_new(BIO_f_base64());
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\& bio = BIO_new_fp(stdout, BIO_NOCLOSE);
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\& BIO_push(b64, bio);
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\& BIO_write(b64, message, strlen(message));
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\& BIO_flush(b64);
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\&
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\& BIO_free_all(b64);
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.Ve
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.PP
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Read Base64 encoded data from standard input and write the decoded
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data to standard output:
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.PP
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.Vb 3
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\& BIO *bio, *b64, *bio_out;
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\& char inbuf[512];
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\& int inlen;
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\&
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\& b64 = BIO_new(BIO_f_base64());
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\& bio = BIO_new_fp(stdin, BIO_NOCLOSE);
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\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
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\& BIO_push(b64, bio);
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\& while ((inlen = BIO_read(b64, inbuf, 512)) > 0)
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\& BIO_write(bio_out, inbuf, inlen);
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\&
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\& BIO_flush(bio_out);
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\& BIO_free_all(b64);
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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The ambiguity of \s-1EOF\s0 in base64 encoded data can cause additional
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data following the base64 encoded block to be misinterpreted.
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.PP
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There should be some way of specifying a test that the \s-1BIO\s0 can perform
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to reliably determine \s-1EOF\s0 (for example a \s-1MIME\s0 boundary).
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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