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utf8.c
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utf8.c
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#include "utf8.h"
#include "utils.h"
#include "internal.h"
#include "gc/objects.h"
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stddef.h>
typedef struct {
uint64_t epoch;
const char *str;
size_t byte_len;
size_t byte_pos;
size_t utf16_pos;
} utf16_scan_cache_t;
typedef struct {
const char *str;
size_t byte_len;
const unsigned char *start;
const unsigned char *end;
const unsigned char *p;
size_t utf16_pos;
} utf16_scan_cursor_t;
static _Thread_local utf16_scan_cache_t utf16_scan_cache = { 0 };
static inline void utf16_scan_cache_sync_epoch(void) {
uint64_t epoch = gc_get_epoch();
if (utf16_scan_cache.epoch == epoch) return;
utf16_scan_cache = (utf16_scan_cache_t){ .epoch = epoch };
}
static inline void utf16_scan_cursor_init(
utf16_scan_cursor_t *cursor,
const char *str,
size_t byte_len
) {
utf16_scan_cache_sync_epoch();
cursor->str = str;
cursor->byte_len = byte_len;
cursor->start = (const unsigned char *)str;
cursor->end = cursor->start + byte_len;
cursor->p = cursor->start;
cursor->utf16_pos = 0;
}
static inline bool utf16_scan_cache_matches(const utf16_scan_cursor_t *cursor) {
return utf16_scan_cache.str == cursor->str
&& utf16_scan_cache.byte_pos <= cursor->byte_len;
}
static inline void utf16_scan_cursor_resume_cached(utf16_scan_cursor_t *cursor) {
if (!utf16_scan_cache_matches(cursor)) return;
cursor->p = cursor->start + utf16_scan_cache.byte_pos;
cursor->utf16_pos = utf16_scan_cache.utf16_pos;
}
static inline void utf16_scan_cursor_resume_utf16(
utf16_scan_cursor_t *cursor,
size_t target_utf16
) {
if (!utf16_scan_cache_matches(cursor)) return;
if (target_utf16 < utf16_scan_cache.utf16_pos) return;
cursor->p = cursor->start + utf16_scan_cache.byte_pos;
cursor->utf16_pos = utf16_scan_cache.utf16_pos;
}
static inline void utf16_scan_cursor_resume_byte(
utf16_scan_cursor_t *cursor,
size_t target_byte
) {
if (!utf16_scan_cache_matches(cursor)) return;
if (target_byte < utf16_scan_cache.byte_pos) return;
cursor->p = cursor->start + utf16_scan_cache.byte_pos;
cursor->utf16_pos = utf16_scan_cache.utf16_pos;
}
static inline void utf16_scan_cursor_store(const utf16_scan_cursor_t *cursor) {
utf16_scan_cache.str = cursor->str;
utf16_scan_cache.byte_len = cursor->byte_len;
utf16_scan_cache.byte_pos = (size_t)(cursor->p - cursor->start);
utf16_scan_cache.utf16_pos = cursor->utf16_pos;
}
static inline void utf16_scan_decode(
const unsigned char *p,
const unsigned char *end,
size_t *slen_out,
size_t *units_out,
uint32_t *cp_out
) {
unsigned char c = *p;
if (c < 0x80) {
if (cp_out) *cp_out = c;
*slen_out = 1;
*units_out = 1;
return;
}
if ((c & 0xE0) == 0xC0) {
if (cp_out && p + 1 < end) {
*cp_out = ((uint32_t)(c & 0x1F) << 6) | (uint32_t)(p[1] & 0x3F);
*slen_out = 2;
*units_out = 1;
return;
}
if (!cp_out) {
*slen_out = 2;
*units_out = 1;
return;
}
} else if ((c & 0xF0) == 0xE0) {
if (cp_out && p + 2 < end) {
*cp_out = ((uint32_t)(c & 0x0F) << 12)
| ((uint32_t)(p[1] & 0x3F) << 6)
| (uint32_t)(p[2] & 0x3F);
*slen_out = 3;
*units_out = 1;
return;
}
if (!cp_out) {
*slen_out = 3;
*units_out = 1;
return;
}
} else if ((c & 0xF8) == 0xF0) {
if (cp_out && p + 3 < end) {
*cp_out = ((uint32_t)(c & 0x07) << 18)
| ((uint32_t)(p[1] & 0x3F) << 12)
| ((uint32_t)(p[2] & 0x3F) << 6)
| (uint32_t)(p[3] & 0x3F);
*slen_out = 4;
*units_out = 2;
return;
}
if (!cp_out) {
*slen_out = 4;
*units_out = 2;
return;
}
}
if (cp_out) *cp_out = c;
*slen_out = 1;
*units_out = 1;
}
static inline bool utf16_scan_cursor_advance(
utf16_scan_cursor_t *cursor,
const unsigned char *bound_end
) {
size_t slen, units;
const unsigned char *next;
utf16_scan_decode(cursor->p, cursor->end, &slen, &units, NULL);
next = cursor->p + slen;
cursor->utf16_pos += units;
if (next > bound_end) {
cursor->p = bound_end;
return false;
}
cursor->p = next;
return true;
}
static uint32_t utf8_decode(const unsigned char *buf, size_t len, int *seq_len) {
if (len == 0) { *seq_len = 0; return 0; }
utf8proc_int32_t cp;
*seq_len = (int)utf8_next(buf, (utf8proc_ssize_t)len, &cp);
return cp < 0 ? 0xFFFD : (uint32_t)cp;
}
static bool utf8_json_quote_reserve(char **buf, size_t *cap, size_t need) {
if (need <= *cap) return true;
size_t next = *cap ? *cap * 2 : 64;
while (next < need) next *= 2;
char *tmp = realloc(*buf, next);
if (!tmp) return false;
*buf = tmp;
*cap = next;
return true;
}
static bool utf8_json_quote_append(
char **buf, size_t *len, size_t *cap, const void *src, size_t src_len
) {
if (!utf8_json_quote_reserve(buf, cap, *len + src_len + 1)) return false;
memcpy(*buf + *len, src, src_len);
*len += src_len;
(*buf)[*len] = '\0';
return true;
}
static bool utf8_json_quote_append_char(char **buf, size_t *len, size_t *cap, char ch) {
return utf8_json_quote_append(buf, len, cap, &ch, 1);
}
static bool utf8_json_quote_append_u_escape(
char **buf, size_t *len, size_t *cap, uint32_t code_unit
) {
char escape[6] = {
'\\', 'u',
hex_char((int)(code_unit >> 12)),
hex_char((int)(code_unit >> 8)),
hex_char((int)(code_unit >> 4)),
hex_char((int)code_unit),
};
return utf8_json_quote_append(buf, len, cap, escape, sizeof(escape));
}
char *utf8_json_quote(const char *str, size_t byte_len, size_t *out_len) {
size_t utf16_len = utf16_strlen(str, byte_len);
size_t raw_len = 0;
size_t raw_cap = byte_len + 4;
char *raw = malloc(raw_cap);
if (!raw) return NULL;
if (!utf8_json_quote_append_char(&raw, &raw_len, &raw_cap, '"')) goto oom;
for (size_t i = 0; i < utf16_len; i++) {
uint32_t cu = utf16_code_unit_at(str, byte_len, i);
if (cu >= 0xD800 && cu <= 0xDBFF && i + 1 < utf16_len) {
uint32_t cu2 = utf16_code_unit_at(str, byte_len, i + 1);
if (cu2 >= 0xDC00 && cu2 <= 0xDFFF) {
uint32_t cp = utf16_codepoint_at(str, byte_len, i);
char utf8[4];
int n = utf8_encode(cp, utf8);
if (n <= 0 || !utf8_json_quote_append(&raw, &raw_len, &raw_cap, utf8, (size_t)n)) goto oom;
i++;
continue;
}}
if (cu >= 0xD800 && cu <= 0xDFFF) {
if (!utf8_json_quote_append_u_escape(&raw, &raw_len, &raw_cap, cu)) goto oom;
continue;
}
switch (cu) {
case '"': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\\"", 2)) goto oom; continue;
case '\\': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\\\", 2)) goto oom; continue;
case '\b': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\b", 2)) goto oom; continue;
case '\f': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\f", 2)) goto oom; continue;
case '\n': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\n", 2)) goto oom; continue;
case '\r': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\r", 2)) goto oom; continue;
case '\t': if (!utf8_json_quote_append(&raw, &raw_len, &raw_cap, "\\t", 2)) goto oom; continue;
default: break;
}
if (cu < 0x20) {
if (!utf8_json_quote_append_u_escape(&raw, &raw_len, &raw_cap, cu)) goto oom;
continue;
}
char utf8[4];
int n = utf8_encode(cu, utf8);
if (n <= 0 || !utf8_json_quote_append(&raw, &raw_len, &raw_cap, utf8, (size_t)n)) goto oom;
}
if (!utf8_json_quote_append_char(&raw, &raw_len, &raw_cap, '"')) goto oom;
if (out_len) *out_len = raw_len;
return raw;
oom:
free(raw);
if (out_len) *out_len = 0;
return NULL;
}
size_t utf8_char_len_at(const char *str, size_t byte_len, size_t pos) {
if (pos >= byte_len) return 1;
int seq = utf8_sequence_length((unsigned char)str[pos]);
if (seq <= 0) return 1;
if (pos + (size_t)seq > byte_len) return byte_len - pos;
return (size_t)seq;
}
size_t utf8_strlen(const char *str, size_t byte_len) {
size_t count = 0;
const unsigned char *p = (const unsigned char *)str;
const unsigned char *end = p + byte_len;
while (p < end) {
int seq_len = utf8_sequence_length(*p);
if (seq_len <= 0 || (size_t)seq_len > (size_t)(end - p)) {
count++; p++;
} else { count++; p += seq_len; }
}
return count;
}
size_t utf16_strlen(const char *str, size_t byte_len) {
if (str_is_ascii(str)) return byte_len;
utf16_scan_cursor_t cursor;
utf16_scan_cursor_init(&cursor, str, byte_len);
utf16_scan_cursor_resume_cached(&cursor);
while (cursor.p < cursor.end) {
utf16_scan_cursor_advance(&cursor, cursor.end);
}
utf16_scan_cursor_store(&cursor);
return cursor.utf16_pos;
}
int utf16_index_to_byte_offset(
const char *str,
size_t byte_len,
size_t utf16_idx,
size_t *out_char_bytes
) {
if (str_is_ascii(str)) {
if (utf16_idx > byte_len) return -1;
if (out_char_bytes) *out_char_bytes = (utf16_idx < byte_len) ? 1 : 0;
return (int)utf16_idx;
}
utf16_scan_cursor_t cursor;
utf16_scan_cursor_init(&cursor, str, byte_len);
utf16_scan_cursor_resume_utf16(&cursor, utf16_idx);
while (cursor.p < cursor.end && cursor.utf16_pos < utf16_idx) {
utf16_scan_cursor_advance(&cursor, cursor.end);
}
if (cursor.p >= cursor.end) {
if (cursor.utf16_pos == utf16_idx) {
if (out_char_bytes) *out_char_bytes = 0;
utf16_scan_cursor_store(&cursor);
return (int)byte_len;
}
utf16_scan_cursor_store(&cursor);
return -1;
}
size_t slen, units;
utf16_scan_decode(cursor.p, cursor.end, &slen, &units, NULL);
if (out_char_bytes) *out_char_bytes = slen;
utf16_scan_cursor_store(&cursor);
return (int)(cursor.p - cursor.start);
}
int utf16_range_to_byte_range(
const char *str,
size_t byte_len,
size_t utf16_start,
size_t utf16_end,
size_t *byte_start,
size_t *byte_end
) {
if (str_is_ascii(str)) {
*byte_start = (utf16_start <= byte_len) ? utf16_start : byte_len;
*byte_end = (utf16_end <= byte_len) ? utf16_end : byte_len;
return 0;
}
utf16_scan_cursor_t cursor;
utf16_scan_cursor_init(&cursor, str, byte_len);
utf16_scan_cursor_resume_utf16(&cursor, utf16_start);
size_t b_start = 0, b_end = byte_len;
int found_start = 0, found_end = 0;
while (cursor.p < cursor.end) {
if (cursor.utf16_pos == utf16_start) {
b_start = (size_t)(cursor.p - cursor.start);
found_start = 1;
}
if (cursor.utf16_pos == utf16_end) {
b_end = (size_t)(cursor.p - cursor.start);
found_end = 1;
break;
}
utf16_scan_cursor_advance(&cursor, cursor.end);
}
if (!found_start && utf16_start >= cursor.utf16_pos) b_start = byte_len;
if (!found_end && utf16_end >= cursor.utf16_pos) b_end = byte_len;
*byte_start = b_start;
*byte_end = b_end;
utf16_scan_cursor_store(&cursor);
return 0;
}
size_t byte_offset_to_utf16(const char *str, size_t byte_off) {
if (str_is_ascii(str)) return byte_off;
utf16_scan_cursor_t cursor;
const unsigned char *bound_end;
bool ended_on_boundary = true;
utf16_scan_cursor_init(&cursor, str, byte_off);
utf16_scan_cursor_resume_byte(&cursor, byte_off);
bound_end = cursor.start + byte_off;
while (cursor.p < bound_end) {
if (!utf16_scan_cursor_advance(&cursor, bound_end)) {
ended_on_boundary = false;
break;
}
}
if (ended_on_boundary) utf16_scan_cursor_store(&cursor);
return cursor.utf16_pos;
}
uint32_t utf16_code_unit_at(const char *str, size_t byte_len, size_t utf16_idx) {
if (str_is_ascii(str)) {
if (utf16_idx >= byte_len) return 0xFFFFFFFF;
return (unsigned char)str[utf16_idx];
}
utf16_scan_cursor_t cursor;
utf16_scan_cursor_init(&cursor, str, byte_len);
utf16_scan_cursor_resume_utf16(&cursor, utf16_idx);
while (cursor.p < cursor.end) {
size_t slen, units;
uint32_t cp;
utf16_scan_decode(cursor.p, cursor.end, &slen, &units, &cp);
if (cursor.utf16_pos == utf16_idx) {
utf16_scan_cursor_store(&cursor);
if (units == 2) return 0xD800 + ((cp - 0x10000) >> 10);
return cp;
}
if (units == 2 && cursor.utf16_pos + 1 == utf16_idx) {
utf16_scan_cursor_store(&cursor);
return 0xDC00 + ((cp - 0x10000) & 0x3FF);
}
cursor.p += slen;
cursor.utf16_pos += units;
}
utf16_scan_cursor_store(&cursor);
return 0xFFFFFFFF;
}
utf8proc_ssize_t utf8_whatwg_decode(
utf8_dec_t *dec, const uint8_t *src, size_t len,
char *out, bool fatal, bool stream
) {
static const void *tbl[256] = {
[0x00 ... 0x7F] = &&L_ASCII,
[0x80 ... 0xBF] = &&L_LONE,
[0xC0 ... 0xC1] = &&L_BAD,
[0xC2 ... 0xDF] = &&L_2,
[0xE0] = &&L_E0,
[0xE1 ... 0xEC] = &&L_3,
[0xED] = &&L_ED,
[0xEE ... 0xEF] = &&L_3,
[0xF0] = &&L_F0,
[0xF1 ... 0xF3] = &&L_4,
[0xF4] = &&L_F4,
[0xF5 ... 0xFF] = &&L_BAD,
};
size_t i = 0, o = 0;
int bc = 0;
uint8_t lo = 0x80, hi = 0xBF;
utf8proc_int32_t cp = 0;
uint8_t pb[4]; int pp = 0;
#define FFFD() do { out[o++]=(char)0xEF; out[o++]=(char)0xBF; out[o++]=(char)0xBD; } while(0)
#define NEXT() do { i++; if (i < len) goto *tbl[src[i]]; goto done; } while(0)
if (!len) goto done;
goto *tbl[src[0]];
L_ASCII:
dec->bom_seen = true;
out[o++] = (char)src[i];
NEXT();
L_LONE:
L_BAD:
if (fatal) return -1;
FFFD(); dec->bom_seen = true;
NEXT();
L_E0: bc=2; lo=0xA0; hi=0xBF; cp=src[i]&0x0F; pb[0]=src[i]; pp=1; i++; goto cont;
L_ED: bc=2; lo=0x80; hi=0x9F; cp=src[i]&0x0F; pb[0]=src[i]; pp=1; i++; goto cont;
L_3: bc=2; lo=0x80; hi=0xBF; cp=src[i]&0x0F; pb[0]=src[i]; pp=1; i++; goto cont;
L_F0: bc=3; lo=0x90; hi=0xBF; cp=src[i]&0x07; pb[0]=src[i]; pp=1; i++; goto cont;
L_F4: bc=3; lo=0x80; hi=0x8F; cp=src[i]&0x07; pb[0]=src[i]; pp=1; i++; goto cont;
L_4: bc=3; lo=0x80; hi=0xBF; cp=src[i]&0x07; pb[0]=src[i]; pp=1; i++; goto cont;
L_2: bc=1; lo=0x80; hi=0xBF; cp=src[i]&0x1F; pb[0]=src[i]; pp=1; i++; goto cont;
cont:
while (bc > 0) {
if (i >= len) {
if (stream) { dec->pend_pos = pp; memcpy(dec->pend_buf, pb, pp); }
else { if (fatal) return -1; FFFD(); }
goto done;
}
uint8_t b = src[i];
if (b < lo || b > hi) {
bc = 0; cp = 0; pp = 0;
if (fatal) return -1;
FFFD(); dec->bom_seen = true;
goto *tbl[b];
}
lo = 0x80; hi = 0xBF;
cp = (cp << 6) | (b & 0x3F);
pb[pp++] = b; bc--; i++;
}
pp = 0;
if (!dec->bom_seen && cp == 0xFEFF && !dec->ignore_bom) dec->bom_seen = true;
else {
dec->bom_seen = true;
utf8proc_ssize_t n = utf8proc_encode_char(cp, (utf8proc_uint8_t *)(out + o));
if (n > 0) o += (size_t)n;
}
cp = 0;
if (i < len) goto *tbl[src[i]];
done:
#undef FFFD
#undef NEXT
return (utf8proc_ssize_t)o;
}
uint32_t utf16_codepoint_at(const char *str, size_t byte_len, size_t utf16_idx) {
if (str_is_ascii(str)) {
if (utf16_idx >= byte_len) return 0xFFFFFFFF;
return (unsigned char)str[utf16_idx];
}
utf16_scan_cursor_t cursor;
utf16_scan_cursor_init(&cursor, str, byte_len);
utf16_scan_cursor_resume_utf16(&cursor, utf16_idx);
while (cursor.p < cursor.end) {
size_t slen, units;
uint32_t cp;
utf16_scan_decode(cursor.p, cursor.end, &slen, &units, &cp);
if (cursor.utf16_pos == utf16_idx) {
utf16_scan_cursor_store(&cursor);
return cp;
}
if (units == 2 && cursor.utf16_pos + 1 == utf16_idx) {
utf16_scan_cursor_store(&cursor);
return 0xDC00 + ((cp - 0x10000) & 0x3FF);
}
cursor.p += slen;
cursor.utf16_pos += units;
}
utf16_scan_cursor_store(&cursor);
return 0xFFFFFFFF;
}

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