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137 .IX Title "BIO_f_base64 3"
138 .TH BIO_f_base64 3 "2014-08-10" "1.0.1n" "OpenSSL"
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144 BIO_f_base64 \- base64 BIO filter
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/bio.h>
151 \& #include <openssl/evp.h>
153 \& BIO_METHOD * BIO_f_base64(void);
156 .IX Header "DESCRIPTION"
157 \&\fIBIO_f_base64()\fR returns the base64 \s-1BIO\s0 method. This is a filter
158 \&\s-1BIO\s0 that base64 encodes any data written through it and decodes
159 any data read through it.
161 Base64 BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR.
163 \&\fIBIO_flush()\fR on a base64 \s-1BIO\s0 that is being written through is
164 used to signal that no more data is to be encoded: this is used
165 to flush the final block through the \s-1BIO.\s0
167 The flag \s-1BIO_FLAGS_BASE64_NO_NL\s0 can be set with \fIBIO_set_flags()\fR
168 to encode the data all on one line or expect the data to be all
172 Because of the format of base64 encoding the end of the encoded
173 block cannot always be reliably determined.
175 .IX Header "RETURN VALUES"
176 \&\fIBIO_f_base64()\fR returns the base64 \s-1BIO\s0 method.
178 .IX Header "EXAMPLES"
179 Base64 encode the string \*(L"Hello World\en\*(R" and write the result
184 \& char message[] = "Hello World \en";
186 \& b64 = BIO_new(BIO_f_base64());
187 \& bio = BIO_new_fp(stdout, BIO_NOCLOSE);
188 \& BIO_push(b64, bio);
189 \& BIO_write(b64, message, strlen(message));
192 \& BIO_free_all(b64);
195 Read Base64 encoded data from standard input and write the decoded
196 data to standard output:
199 \& BIO *bio, *b64, *bio_out;
203 \& b64 = BIO_new(BIO_f_base64());
204 \& bio = BIO_new_fp(stdin, BIO_NOCLOSE);
205 \& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
206 \& BIO_push(b64, bio);
207 \& while((inlen = BIO_read(b64, inbuf, 512)) > 0)
208 \& BIO_write(bio_out, inbuf, inlen);
210 \& BIO_flush(bio_out);
211 \& BIO_free_all(b64);
215 The ambiguity of \s-1EOF\s0 in base64 encoded data can cause additional
216 data following the base64 encoded block to be misinterpreted.
218 There should be some way of specifying a test that the \s-1BIO\s0 can perform
219 to reliably determine \s-1EOF \s0(for example a \s-1MIME\s0 boundary).
221 .IX Header "SEE ALSO"