mirror of
https://github.com/jart/cosmopolitan.git
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100 lines
4.4 KiB
C
100 lines
4.4 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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/**
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* @fileoverview base64 stream coder
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*
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* Does `openssl base64 [-d]` as a 20kb αcτµαlly pδrταblε εxεcµταblε.
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*/
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#define CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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const signed char kBase64[256] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x00
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x10
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, // 0x20
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, // 0x30
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 0x40
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, 63, // 0x50
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-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 0x60
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, // 0x70
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x80
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x90
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xa0
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xb0
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xc0
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xd0
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xe0
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xf0
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};
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void Encode(void) {
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int a, b, c, w;
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while ((a = getchar()) != -1) {
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b = getchar();
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c = getchar();
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w = a << 020;
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if (b != -1) w |= b << 010;
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if (c != -1) w |= c;
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putchar(CHARS[(w >> 18) & 077]);
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putchar(CHARS[(w >> 12) & 077]);
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putchar(b != -1 ? CHARS[(w >> 6) & 077] : '=');
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putchar(c != -1 ? CHARS[w & 077] : '=');
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}
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putchar('\n');
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}
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int Get(void) {
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int c;
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while ((c = getchar()) != -1) {
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if ((c = kBase64[c]) != -1) break;
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}
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return c;
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}
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void Decode(void) {
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int a, b, c, d, w;
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while ((a = Get()) != -1 && (b = Get()) != -1) {
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c = Get();
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d = Get();
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w = a << 18 | b << 12;
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if (c != -1) w |= c << 6;
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if (d != -1) w |= d;
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putchar((w & 0xFF0000) >> 020);
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if (c != -1) putchar((w & 0x00FF00) >> 010);
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if (d != -1) putchar((w & 0x0000FF) >> 000);
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}
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}
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int main(int argc, char *argv[]) {
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if (argc == 1) {
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Encode();
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} else if (argc == 2 && !strcmp(argv[1], "-d")) {
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Decode();
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} else {
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fputs("usage: ", stderr);
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fputs(argv[0], stderr);
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fputs(" [-d]\n", stderr);
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return 1;
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}
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return ferror(stdin) || ferror(stdout) ? 1 : 0;
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}
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