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/*
* Copyright (c) 2017-2026 Christian Hansen <chansen@cpan.org>
* <https://github.com/chansen/c-utf8>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef UTF8_VALID_H
#define UTF8_VALID_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#if defined(UTF8_DFA32_H) && defined(UTF8_DFA64_H)
# error "utf8_dfa32.h and utf8_dfa64.h are mutually exclusive"
#elif !defined(UTF8_DFA32_H) && !defined(UTF8_DFA64_H)
# error "include utf8_dfa32.h or utf8_dfa64.h before utf8_valid.h"
#endif
#ifdef UTF8_VALID_USE_SIMD
# if defined(__SSE2__) || defined(_M_X64) || (defined(_M_IX86_FP) && (_M_IX86_FP >= 2))
# define UTF8_VALID_HAS_SSE2 1
# include <emmintrin.h>
# elif defined(__aarch64__)
# define UTF8_VALID_HAS_NEON 1
# include <arm_neon.h>
# endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
static inline size_t utf8_maximal_subpart(const char* src, size_t len) {
const unsigned char* s = (const unsigned char*)src;
utf8_dfa_state_t state = UTF8_DFA_ACCEPT;
for (size_t i = 0; i < len; i++) {
state = utf8_dfa_step(state, s[i]);
switch (state) {
case UTF8_DFA_ACCEPT:
return i + 1;
case UTF8_DFA_REJECT:
return i > 0 ? i : 1;
}
}
return len;
}
static inline size_t utf8_maximal_prefix(const char* src, size_t len) {
const unsigned char* s = (const unsigned char*)src;
utf8_dfa_state_t state = UTF8_DFA_ACCEPT;
size_t prefix = 0;
for (size_t i = 0; i < len; i++) {
state = utf8_dfa_step(state, s[i]);
if (state == UTF8_DFA_ACCEPT)
prefix = i + 1;
else if (state == UTF8_DFA_REJECT)
break;
}
return prefix;
}
static inline bool utf8_check(const char* src,
size_t slen,
size_t* cursor) {
const unsigned char* s = (const unsigned char*)src;
size_t len = slen;
utf8_dfa_state_t state = UTF8_DFA_ACCEPT;
// Process 16-byte chunks
while (len >= 16) {
state = utf8_dfa_run16(state, s);
s += 16;
len -= 16;
}
state = utf8_dfa_run(state, s, len);
if (state == UTF8_DFA_ACCEPT) {
if (cursor)
*cursor = slen;
return true;
}
if (cursor)
*cursor = utf8_maximal_prefix(src, slen);
return false;
}
static inline bool utf8_valid(const char* src, size_t len) {
return utf8_check(src, len, NULL);
}
static inline bool utf8_check_ascii_block16(const unsigned char *s) {
#if defined(UTF8_VALID_HAS_SSE2)
__m128i v = _mm_loadu_si128((const __m128i *)s);
return _mm_movemask_epi8(v) == 0;
#elif defined(UTF8_VALID_HAS_NEON)
uint8x16_t v = vld1q_u8(s);
uint8x16_t high = vshrq_n_u8(v, 7);
return vmaxvq_u8(high) == 0;
#else
uint64_t v1, v2;
memcpy(&v1, s, sizeof(v1));
memcpy(&v2, s + sizeof(v1), sizeof(v2));
v1 |= v2;
return (v1 & UINT64_C(0x8080808080808080)) == 0;
#endif
}
static inline bool utf8_check_ascii(const char* src, size_t slen, size_t* cursor) {
const unsigned char* s = (const unsigned char*)src;
size_t len = slen;
utf8_dfa_state_t state = UTF8_DFA_ACCEPT;
// Process 16-byte chunks; skip DFA when state is clean and chunk is ASCII
while (len >= 16) {
if (state != UTF8_DFA_ACCEPT || !utf8_check_ascii_block16(s))
state = utf8_dfa_run16(state, s);
s += 16;
len -= 16;
}
state = utf8_dfa_run(state, s, len);
if (state == UTF8_DFA_ACCEPT) {
if (cursor)
*cursor = slen;
return true;
}
if (cursor)
*cursor = utf8_maximal_prefix(src, slen);
return false;
}
static inline bool utf8_valid_ascii(const char *src, size_t len) {
return utf8_check_ascii(src, len, NULL);
}
#ifdef __cplusplus
}
#endif
#endif
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