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https://github.com/jart/cosmopolitan.git
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fe5c475f83
The Compress() and Uncompress() APIs were a mistake. The functions themselves work fine, but it's a design blemish and does superfluous work. Since they were only introduced in the last few weeks, they're now deprecated and references to them have been scrubbed from the website and other documentation. Please use the new APIs since the old APIs will be removed at some point in the future. This change introduces automated Lua unit tests for the Redbean APIs. There's a few functions that were broken which have now been fixed, e.g. Underlong() and Decimate().
85 lines
3.5 KiB
C
85 lines
3.5 KiB
C
/*-*- 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/intrin/pcmpgtb.h"
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#include "libc/intrin/pmovmskb.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#include "libc/str/thompike.h"
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#include "libc/str/tpenc.h"
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#include "net/http/escape.h"
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/**
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* Canonicalizes overlong Thompson-Pike encodings.
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*
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* Please note that the IETF banned these numbers, so if you want to
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* enforce their ban you can simply strcmp() the result to check for
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* the existence of banned numbers.
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*
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* @param p is input value
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* @param n if -1 implies strlen
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* @param z 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 *Underlong(const char *p, size_t n, size_t *z) {
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uint64_t w;
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char *r, *q;
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size_t i, j, m;
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wint_t x, a, b;
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int8_t v1[16], v2[16], vz[16];
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if (z) *z = 0;
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if (n == -1) n = p ? strlen(p) : 0;
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if ((q = r = malloc(n * 2 + 1))) {
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for (i = 0; i < n;) {
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bzero(vz, 16); /* 50x speedup for ASCII */
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while (i + 16 < n) {
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memcpy(v1, p + i, 16);
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pcmpgtb(v2, v1, vz);
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if (pmovmskb((void *)v2) != 0xFFFF) break;
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memcpy(q, v1, 16);
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q += 16;
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i += 16;
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}
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x = p[i++] & 0xff;
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if (x >= 0300) {
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a = ThomPikeByte(x);
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m = ThomPikeLen(x) - 1;
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if (i + m <= n) {
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for (j = 0;;) {
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b = p[i + j] & 0xff;
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if (!ThomPikeCont(b)) break;
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a = ThomPikeMerge(a, b);
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if (++j == m) {
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x = a;
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i += j;
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break;
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}
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}
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}
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}
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w = tpenc(x);
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do {
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*q++ = w;
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} while ((w >>= 8));
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}
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if (z) *z = q - r;
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*q++ = '\0';
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if ((q = realloc(r, q - r))) r = q;
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}
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return r;
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}
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