87 lines
3.5 KiB
C
87 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 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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/intrin/punpckhbw.h"
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#include "libc/intrin/punpcklbw.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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/**
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* Transcodes UTF-8 to UTF-16.
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*
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* @param dst is output buffer
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* @param dstsize is shorts in dst
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* @param src is NUL-terminated UTF-8 input string
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* @return ax shorts written excluding nul
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* @return dx index of character after nul word in src
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*/
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axdx_t tprecode8to16(char16_t *dst, size_t dstsize, const char *src) {
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axdx_t r;
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unsigned n;
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uint64_t w;
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wint_t x, y;
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uint8_t v1[16], v2[16], vz[16];
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r.ax = 0;
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r.dx = 0;
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for (;;) {
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if (!IsTiny() && !((uintptr_t)(src + r.dx) & 15)) {
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/* 34x speedup for ascii */
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memset(vz, 0, 16);
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while (r.ax + 16 < dstsize) {
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memcpy(v1, src + r.dx, 16);
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pcmpgtb((int8_t *)v2, (int8_t *)v1, (int8_t *)vz);
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if (pmovmskb(v2) != 0xFFFF) break;
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punpcklbw(v2, v1, vz);
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punpckhbw(v1, v1, vz);
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memcpy(dst + r.ax + 0, v2, 16);
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memcpy(dst + r.ax + 8, v1, 16);
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r.ax += 16;
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r.dx += 16;
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}
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}
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x = src[r.dx++] & 0xff;
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if (ThomPikeCont(x)) continue;
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if (!isascii(x)) {
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n = ThomPikeLen(x);
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x = ThomPikeByte(x);
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while (--n) {
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if ((y = src[r.dx++] & 0xff)) {
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x = ThomPikeMerge(x, y);
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} else {
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x = 0;
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break;
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}
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}
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}
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if (!x) break;
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w = EncodeUtf16(x);
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while (w && r.ax + 1 < dstsize) {
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dst[r.ax++] = w & 0xFFFF;
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w >>= 16;
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}
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}
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if (r.ax < dstsize) {
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dst[r.ax] = 0;
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}
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return r;
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}
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