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136 .IX Title "BIO_f_base64 3"
137 .TH BIO_f_base64 3 "2005-11-02" "1.1.0-dev" "OpenSSL"
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143 BIO_f_base64 \- base64 BIO filter
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/bio.h>
150 \& #include <openssl/evp.h>
152 \& BIO_METHOD * BIO_f_base64(void);
155 .IX Header "DESCRIPTION"
156 \&\fIBIO_f_base64()\fR returns the base64 \s-1BIO\s0 method. This is a filter
157 \&\s-1BIO\s0 that base64 encodes any data written through it and decodes
158 any data read through it.
160 Base64 BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR.
162 \&\fIBIO_flush()\fR on a base64 \s-1BIO\s0 that is being written through is
163 used to signal that no more data is to be encoded: this is used
164 to flush the final block through the \s-1BIO\s0.
166 The flag \s-1BIO_FLAGS_BASE64_NO_NL\s0 can be set with \fIBIO_set_flags()\fR
167 to encode the data all on one line or expect the data to be all
171 Because of the format of base64 encoding the end of the encoded
172 block cannot always be reliably determined.
174 .IX Header "RETURN VALUES"
175 \&\fIBIO_f_base64()\fR returns the base64 \s-1BIO\s0 method.
177 .IX Header "EXAMPLES"
178 Base64 encode the string \*(L"Hello World\en\*(R" and write the result
183 \& char message[] = "Hello World \en";
185 \& b64 = BIO_new(BIO_f_base64());
186 \& bio = BIO_new_fp(stdout, BIO_NOCLOSE);
187 \& bio = BIO_push(b64, bio);
188 \& BIO_write(bio, message, strlen(message));
191 \& BIO_free_all(bio);
194 Read Base64 encoded data from standard input and write the decoded
195 data to standard output:
198 \& BIO *bio, *b64, *bio_out;
202 \& b64 = BIO_new(BIO_f_base64());
203 \& bio = BIO_new_fp(stdin, BIO_NOCLOSE);
204 \& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
205 \& bio = BIO_push(b64, bio);
206 \& while((inlen = BIO_read(bio, inbuf, 512)) > 0)
207 \& BIO_write(bio_out, inbuf, inlen);
209 \& BIO_free_all(bio);
213 The ambiguity of \s-1EOF\s0 in base64 encoded data can cause additional
214 data following the base64 encoded block to be misinterpreted.
216 There should be some way of specifying a test that the \s-1BIO\s0 can perform
217 to reliably determine \s-1EOF\s0 (for example a \s-1MIME\s0 boundary).
219 .IX Header "SEE ALSO"