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Add base64 support

Browse source 
Lua Server Pages may now call the EncodeBase64() and DecodeBase64()
functions should they wish to do things like emit embeded data URIs

See #97
This commit is contained in:
Justine Tunney 2021-03-27 18:17:54 -07:00
parent 4d21cd315d
commit dcbd2b8668
8 changed files with 333 additions and 5 deletions
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85
net/http/decodebase64.c Normal file
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@ -0,0 +1,85 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/mem/mem.h"
#include "libc/str/str.h"
#include "net/http/base64.h"
static const signed char kBase64[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x00
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x10
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, // 0x20
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1, // 0x30
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 0x40
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, // 0x50
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 0x60
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, // 0x70
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x80
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0x90
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xa0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xb0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xc0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xd0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xe0
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 0xf0
};
/**
* Decodes base64 ascii representation to binary.
*/
void *DecodeBase64(const char *data, size_t size, size_t *out_size) {
unsigned w;
char *r, *q;
int a, b, c, d;
const char *p, *pe;
if (size == -1) size = strlen(data);
if ((r = malloc(size / 4 * 3 + 1))) {
q = r;
p = data;
pe = p + size;
for (;;) {
do {
if (p == pe) goto Done;
a = kBase64[*p++ & 0xff];
} while (a == -1);
if (a == -2) continue;
do {
if (p == pe) goto Done;
b = kBase64[*p++ & 0xff];
} while (b == -1);
if (b == -2) continue;
do {
c = p < pe ? kBase64[*p++ & 0xff] : -2;
} while (c == -1);
do {
d = p < pe ? kBase64[*p++ & 0xff] : -2;
} while (d == -1);
w = a << 18 | b << 12;
if (c != -2) w |= c << 6;
if (d != -2) w |= d;
*q++ = (w & 0xFF0000) >> 020;
if (c != -2) *q++ = (w & 0x00FF00) >> 010;
if (d != -2) *q++ = (w & 0x0000FF) >> 000;
}
Done:
if (out_size) *out_size = q - r;
*q++ = '\0';
if ((q = realloc(r, q - r))) r = q;
}
return r;
}