Mercurial > hg > toybox
view toys/posix/uuencode.c @ 1605:c4c9267467f8 draft
Add base64.
The tizen guys wanted this. Yeah, I know there's base64 code in
uuencode/uudecode, but that this has -i, input lines aren't of fixed length,
encode/decode are in same file, there's no prefix/suffix code, it always
writes to stdout... Eliminating the code duplication wouldn't be worth
the if/else I'd have to add, so I just did a new one.
Factored out the base64 table init into lib.c though: that was worth sharing.
author | Rob Landley <rob@landley.net> |
---|---|
date | Sat, 13 Dec 2014 11:58:08 -0600 |
parents | 357b31ae2f04 |
children | 1c152e2c5b27 |
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/* uuencode.c - uuencode / base64 encode * * Copyright 2013 Erich Plondke <toybox@erich.wreck.org> * * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/uuencode.html USE_UUENCODE(NEWTOY(uuencode, "<1>2m", TOYFLAG_USR|TOYFLAG_BIN)) config UUENCODE bool "uuencode" default y help usage: uuencode [-m] [file] encode-filename Uuencode stdin (or file) to stdout, with encode-filename in the output. -m base64-encode */ #define FOR_uuencode #include "toys.h" void uuencode_main(void) { char *p, *name = toys.optargs[toys.optc-1], buf[(76/4)*3]; int i, m = toys.optflags & FLAG_m, fd = 0; if (toys.optc > 1) fd = xopen(toys.optargs[0], O_RDONLY); base64_init(toybuf); xprintf("begin%s 744 %s\n", m ? "-base64" : "", name); for (;;) { char *in; if (!(i = xread(fd, buf, m ? sizeof(buf) : 45))) break; if (!m) xputc(i+32); in = buf; for (in = buf; in-buf < i; ) { int j, x, bytes = i - (in-buf); if (bytes > 3) bytes = 3; for (j = x = 0; j<4; j++) { int out; if (j < bytes) x |= (*(in++) & 0x0ff) << (8*(2-j)); out = (x>>((3-j)*6)) & 0x3f; xputc(m ? (j > bytes ? '=' : toybuf[out]) : (out ? out + 0x20 : 0x60)); } } xputc('\n'); } xputs(m ? "====" : "end"); }