mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
94 lines
3.9 KiB
C
94 lines
3.9 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 "libc/str/thompike.h"
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#include "libc/str/utf16.h"
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#include "libc/x/x.h"
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#include "third_party/intel/emmintrin.internal.h"
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/**
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* Transcodes UTF-8 to UTF-32.
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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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*/
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wchar_t *utf8to32(const char *p, size_t n, size_t *z) {
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size_t i;
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unsigned m, j;
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wint_t x, a, b;
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wchar_t *r, *q;
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if (z)
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*z = 0;
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if (n == -1)
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n = p ? strlen(p) : 0;
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if ((q = r = malloc(n * sizeof(wchar_t) + sizeof(wchar_t)))) {
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for (i = 0; i < n;) {
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#ifdef __x86_64__
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if (!((uintptr_t)(p + i) & 15) && i + 16 < n) {
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do {
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__m128i v1, v2, v3, v4;
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v1 = _mm_loadu_si128((__m128i *)(p + i));
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v2 = _mm_cmpgt_epi8(v1, _mm_setzero_si128());
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if (_mm_movemask_epi8(v2) != 0xFFFF)
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break;
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v3 = _mm_unpacklo_epi8(v1, _mm_setzero_si128());
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v1 = _mm_unpackhi_epi8(v1, _mm_setzero_si128());
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v4 = _mm_unpacklo_epi16(v3, _mm_setzero_si128());
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v3 = _mm_unpackhi_epi16(v3, _mm_setzero_si128());
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v2 = _mm_unpacklo_epi16(v1, _mm_setzero_si128());
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v1 = _mm_unpackhi_epi16(v1, _mm_setzero_si128());
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_mm_storeu_si128((__m128i *)(q + 0), v4);
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_mm_storeu_si128((__m128i *)(q + 4), v3);
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_mm_storeu_si128((__m128i *)(q + 8), v2);
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_mm_storeu_si128((__m128i *)(q + 12), v1);
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i += 16;
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q += 16;
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} while (i + 16 < n);
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}
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#endif
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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))
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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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*q++ = x;
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}
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if (z)
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*z = q - r;
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*q++ = '\0';
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if ((q = realloc(r, (q - r) * sizeof(wchar_t))))
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r = q;
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}
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return r;
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}
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