Mon Jan 13 19:26:50 2003
Standard preamble:
======================================================================
\\$1
.. ..
.... Set up some character translations and predefined strings. \*(-- will
give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
double quote, and \*(R" will give a right double quote. | will give a
real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
to do unbreakable dashes and therefore won't be available. \*(C` and
\*(C' expand to `' in nroff, nothing in troff, for use with C<>
.tr \(*W-|\(bv\*(Tr . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' 'br\}
If the F register is turned on, we'll generate index entries on stderr
for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
index entries marked with X<> in POD. Of course, you'll have to process
the output yourself in some meaningful fashion.
. de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . nr % 0 . rr F .\}
For nroff, turn off justification. Always turn off hyphenation; it
makes way too many mistakes in technical documents.
Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
Fear. Run. Save yourself. No user-serviceable parts.
.bd B 3 . \" fudge factors for nroff and troff . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} ======================================================================
Title "BIO_f_base64 3"
Base64 BIOs do not support BIO_gets() or BIO_puts().
\fIBIO_flush() on a base64 \s-1BIO\s0 that is being written through is used to signal that no more data is to be encoded: this is used to flush the final block through the \s-1BIO\s0.
The flag \s-1BIO_FLAGS_BASE64_NO_NL\s0 can be set with BIO_set_flags() to encode the data all on one line or expect the data to be all on one line.
.Vb 2 BIO *bio, *b64; char message[] = "Hello World \en"; .Ve .Vb 5 b64 = BIO_new(BIO_f_base64()); bio = BIO_new_fp(stdout, BIO_NOCLOSE); bio = BIO_push(b64, bio); BIO_write(bio, message, strlen(message)); BIO_flush(bio); .Ve .Vb 1 BIO_free_all(bio); .Ve Read Base64 encoded data from standard input and write the decoded data to standard output:
.Vb 4 BIO *bio, *b64, bio_out; char inbuf[512]; int inlen; char message[] = "Hello World \en"; .Ve .Vb 6 b64 = BIO_new(BIO_f_base64()); bio = BIO_new_fp(stdin, BIO_NOCLOSE); bio_out = BIO_new_fp(stdout, BIO_NOCLOSE); bio = BIO_push(b64, bio); while((inlen = BIO_read(bio, inbuf, strlen(message))) > 0) BIO_write(bio_out, inbuf, inlen); .Ve .Vb 1 BIO_free_all(bio); .Ve
There should be some way of specifying a test that the \s-1BIO\s0 can perform to reliably determine \s-1EOF\s0 (for example a \s-1MIME\s0 boundary).