229 lines
6.2 KiB
Groff
229 lines
6.2 KiB
Groff
.\" $NetBSD: BIO_f_base64.3,v 1.6 2002/08/09 16:15:36 itojun Exp $
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.\" Sat Aug 10 00:55:39 2002
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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 "0.9.6g" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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BIO_f_base64 \- base64 \s-1BIO\s0 filter
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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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.Ve
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.Vb 1
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\& 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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.Ve
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.Vb 5
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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 = BIO_push(b64, bio);
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\& BIO_write(bio, message, strlen(message));
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\& BIO_flush(bio);
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.Ve
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.Vb 1
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\& BIO_free_all(bio);
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.Ve
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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 4
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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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\& char message[] = "Hello World \en";
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.Ve
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.Vb 6
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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 = BIO_push(b64, bio);
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\& while((inlen = BIO_read(bio, inbuf, strlen(message))) > 0)
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\& BIO_write(bio_out, inbuf, inlen);
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.Ve
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.Vb 1
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\& BIO_free_all(bio);
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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 "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1TBA\s0
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