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https://github.com/jart/cosmopolitan.git
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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
59 lines
2.9 KiB
C
59 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/mem/mem.h"
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#include "libc/str/str.h"
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#include "net/http/escape.h"
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#define CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
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/**
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* Encodes binary to base64 ascii representation.
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*
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* @param data is input value
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* @param size if -1 implies strlen
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* @param out_size if non-NULL receives output length
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* @return allocated NUL-terminated buffer, or NULL w/ errno
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*/
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char *EncodeBase64(const char *data, size_t size, size_t *out_size) {
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size_t n;
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unsigned w;
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char *r, *q;
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const unsigned char *p, *pe;
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if (size == -1) size = data ? strlen(data) : 0;
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if ((n = size) % 3) n += 3 - size % 3;
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n /= 3, n *= 4;
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if ((r = malloc(n + 1))) {
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for (q = r, p = (void *)data, pe = p + size; p < pe; p += 3) {
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w = p[0] << 020;
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if (p + 1 < pe) w |= p[1] << 010;
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if (p + 2 < pe) w |= p[2] << 000;
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*q++ = CHARS[(w >> 18) & 077];
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*q++ = CHARS[(w >> 12) & 077];
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*q++ = p + 1 < pe ? CHARS[(w >> 6) & 077] : '=';
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*q++ = p + 2 < pe ? CHARS[w & 077] : '=';
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}
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*q++ = '\0';
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} else {
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n = 0;
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}
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if (out_size) {
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*out_size = n;
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}
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return r;
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}
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