Tiny base64 encoder/decoder command patterned after the linux and the macosx
ones with the same name,.
This commit is contained in:
christos
parent
a16788053a
commit
0d2d986001
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# $NetBSD: Makefile,v 1.231 2018/07/13 11:14:14 maxv Exp $
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# $NetBSD: Makefile,v 1.232 2018/07/24 15:26:16 christos Exp $
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# from: @(#)Makefile 8.3 (Berkeley) 1/7/94
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.include <bsd.own.mk>
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SUBDIR= apply asa at audio audiocfg \
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banner basename biff bthset btkey btpin \
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banner base64 basename biff bthset btkey btpin \
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bzip2 bzip2recover c11 c89 c99 cal calendar cap_mkdb cdplay \
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checknr chflags chpass cksum cmp cleantags col colcrt colrm \
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column comm compress config crunch csplit ctags cut cvslatest \
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# $NetBSD: Makefile,v 1.1 2018/07/24 15:26:16 christos Exp $
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WARNS?= 6
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.include <bsd.own.mk>
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PROG= base64
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.include <bsd.prog.mk>
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.\" $NetBSD: base64.1,v 1.1 2018/07/24 15:26:16 christos Exp $
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.\"
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.\" Copyright (c) 2018 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Christos Zoulas.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\"
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.Dd July 24, 2018
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.Dt base64 1
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.Os
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.Sh NAME
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.Nm base64
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.Nd base64 encode/decode data into the stardard output
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.Sh SYNOPSIS
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.Nm
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.Op Fl di
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.Op Fl w Ar wrap
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.Op Ar
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.Sh DESCRIPTION
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.Nm
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reads from the standard input or from each file argument, and encodes
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or decodes data based on the base64 scheme described in RFC 3548 into
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the standard output.
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.Pp
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The following options are available:
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.Bl -tag -width XXXXXXX
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.It Fl d
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Decode the input instead of encoding it.
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.It Fl i
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Ignore whitespace characters when decoding.
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.It Fl w Ar wrap
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Wrap lines longer than
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.Ar wrap
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characters using a newline.
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The default number of characters is 76.
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.El
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.Sh EXIT STATUS
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.Nm
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exits with 0 if there was no error and non-zero if it could not encode or
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decode, printing an error message.
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.Sh SEE ALSO
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.Xr b64_ntop ,
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.Xr b64_pton .
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.Sh AUTHORS
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Christos Zoulas
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.Sh HISTORY
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The
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.Nm
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command first appeared on
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Linux ?, MacOS/X ?, and
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.Nx 9 .
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@ -0,0 +1,278 @@
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/* $NetBSD: base64.c,v 1.1 2018/07/24 15:26:16 christos Exp $ */
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/*-
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* Copyright (c) 2018 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: base64.c,v 1.1 2018/07/24 15:26:16 christos Exp $");
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#include <ctype.h>
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#include <errno.h>
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#include <err.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static const char B64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static size_t
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getinput(FILE *fin, uint8_t in[3])
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{
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size_t res;
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int c;
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for (res = 0; res < 3 && (c = getc(fin)) != EOF; res++)
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in[res] = (uint8_t)c;
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for (size_t i = res; i < 3; i++)
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in[i] = 0;
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return res;
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}
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static int
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putoutput(FILE *fout, uint8_t out[4], size_t len, size_t wrap, size_t *pos)
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{
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size_t i;
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for (i = 0; i < len + 1; i++) {
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if (out[i] >= 64) {
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errno = EINVAL;
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return -1;
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}
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if (fputc(B64[out[i]], fout) == -1)
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return -1;
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if (++(*pos) == wrap) {
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if (fputc('\n', fout) == -1)
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return -1;
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*pos = 0;
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}
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}
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for (; i < 4; i++) {
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if (fputc('=', fout) == -1)
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return -1;
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if (++(*pos) == wrap) {
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if (fputc('\n', fout) == -1)
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return -1;
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*pos = 0;
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}
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}
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return 0;
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}
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static void
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encode(uint8_t out[4], uint8_t in[3])
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{
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out[0] = in[0] >> 2;
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out[1] = (uint8_t)(((in[0] & 0x03) << 4) | (in[1] >> 4));
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out[2] = (uint8_t)(((in[1] & 0x0f) << 2) | (in[2] >> 6));
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out[3] = in[2] & 0x3f;
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}
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static int
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b64_encode(FILE *fout, FILE *fin, size_t wrap)
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{
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uint8_t in[3];
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uint8_t out[4];
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size_t ilen;
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size_t pos = 0;
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while ((ilen = getinput(fin, in)) > 2) {
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encode(out, in);
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if (putoutput(fout, out, ilen, wrap, &pos) == -1)
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return -1;
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}
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if (ilen != 0) {
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encode(out, in);
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if (putoutput(fout, out, ilen, wrap, &pos) == -1)
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return -1;
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}
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if (pos && wrap) {
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if (fputc('\n', fout) == -1)
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return -1;
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}
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return 0;
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}
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static int
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b64_decode(FILE *fout, FILE *fin, bool ignore)
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{
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int state, c;
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uint8_t b, out;
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char *pos;
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state = 0;
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out = 0;
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while ((c = getc(fin)) != -1) {
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if (ignore && isspace(c))
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continue;
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if (c == '=')
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break;
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pos = strchr(B64, c);
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if (pos == NULL)
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return -1;
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b = (uint8_t)(pos - B64);
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switch (state) {
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case 0:
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out = (uint8_t)(b << 2);
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break;
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case 1:
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out |= b >> 4;
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if (fputc(out, fout) == -1)
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return -1;
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out = (uint8_t)((b & 0xf) << 4);
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break;
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case 2:
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out |= b >> 2;
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if (fputc(out, fout) == -1)
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return -1;
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out = (uint8_t)((b & 0x3) << 6);
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break;
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case 3:
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out |= b;
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if (fputc(out, fout) == -1)
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return -1;
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out = 0;
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break;
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default:
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abort();
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}
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state = (state + 1) & 3;
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}
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if (c == '=') {
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switch (state) {
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case 0:
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case 1:
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return -1;
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case 2:
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while ((c = getc(fin)) != -1) {
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if (ignore && isspace(c))
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continue;
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break;
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}
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if (c != '=')
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return -1;
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/*FALLTHROUGH*/
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case 3:
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while ((c = getc(fin)) != -1) {
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if (ignore && isspace(c))
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continue;
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break;
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}
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if (c != -1)
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return -1;
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return 0;
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default:
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abort();
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}
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}
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if (c != -1 || state != 0)
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return -1;
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return 0;
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}
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static __dead void
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usage(void)
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{
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fprintf(stderr, "Usage: %s [-di] [-w <wrap>] [<file>]...\n",
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getprogname());
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exit(EXIT_FAILURE);
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}
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static void
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doit(FILE *fout, FILE *fin, bool decode, bool ignore, size_t wrap)
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{
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int e;
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if (decode)
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e = b64_decode(stdout, stdin, ignore) != 0;
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else
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e = b64_encode(stdout, stdin, wrap) != 0;
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if (e != 0)
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errx(EXIT_FAILURE, "%scoding failed", decode ? "De": "En");
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}
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int
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main(int argc, char *argv[])
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{
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bool decode = false;
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size_t wrap = 76;
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bool ignore = false;
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int c;
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while ((c = getopt(argc, argv, "diw:")) != -1) {
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switch (c) {
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case 'd':
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decode = true;
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break;
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case 'i':
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ignore = true;
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break;
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case 'w':
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wrap = (size_t)atoi(optarg);
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break;
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default:
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usage();
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}
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}
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if (optind == argc) {
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doit(stdout, stdin, decode, ignore, wrap);
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return EXIT_SUCCESS;
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}
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for (c = optind; c < argc; c++) {
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FILE *fp = strcmp(argv[c], "-") == 0 ?
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stdin : fopen(argv[c], "r");
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if (fp == NULL)
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err(EXIT_FAILURE, "Can't open `%s'", argv[c]);
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doit(stdout, fp, decode, ignore, wrap);
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if (fp != stdin)
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fclose(fp);
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fclose(fp);
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}
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return EXIT_SUCCESS;
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}
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