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feat: support external Hugging Face tokenizer JSON files (#1973)
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/**********************************************************************
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utf8.c - Oniguruma (regular expression library)
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**********************************************************************/
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/*-
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* Copyright (c) 2002-2019 K.Kosako
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "regenc.h"
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/* U+0000 - U+10FFFF */
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#define USE_RFC3629_RANGE
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/* #define USE_INVALID_CODE_SCHEME */
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#ifdef USE_INVALID_CODE_SCHEME
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/* virtual codepoint values for invalid encoding byte 0xfe and 0xff */
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#define INVALID_CODE_FE 0xfffffffe
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#define INVALID_CODE_FF 0xffffffff
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#define VALID_CODE_LIMIT 0x7fffffff
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#endif
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#define utf8_islead(c) ((UChar )((c) & 0xc0) != 0x80)
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#define utf8_istail(c) ((UChar )((c) & 0xc0) == 0x80)
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static const int EncLen_UTF8[] = {
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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#ifdef USE_RFC3629_RANGE
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4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
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#else
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4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1
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#endif
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};
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static int
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mbc_enc_len(const UChar* p)
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{
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return EncLen_UTF8[*p];
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}
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static int
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is_valid_mbc_string(const UChar* p, const UChar* end)
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{
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int i, len;
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while (p < end) {
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if (! utf8_islead(*p))
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return FALSE;
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len = mbc_enc_len(p++);
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if (len > 1) {
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for (i = 1; i < len; i++) {
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if (p == end)
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return FALSE;
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if (! utf8_istail(*p++))
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return FALSE;
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}
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}
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}
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return TRUE;
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}
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static OnigCodePoint
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mbc_to_code(const UChar* p, const UChar* end)
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{
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int c, len;
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OnigCodePoint n;
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len = mbc_enc_len(p);
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if (len > (int )(end - p)) len = (int )(end - p);
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c = *p++;
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if (len > 1) {
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len--;
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n = c & ((1 << (6 - len)) - 1);
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while (len--) {
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c = *p++;
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n = (n << 6) | (c & ((1 << 6) - 1));
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}
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return n;
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}
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else {
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#ifdef USE_INVALID_CODE_SCHEME
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if (c > 0xfd) {
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return ((c == 0xfe) ? INVALID_CODE_FE : INVALID_CODE_FF);
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}
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#endif
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return (OnigCodePoint )c;
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}
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}
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static int
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code_to_mbclen(OnigCodePoint code)
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{
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if ((code & 0xffffff80) == 0) return 1;
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else if ((code & 0xfffff800) == 0) return 2;
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else if ((code & 0xffff0000) == 0) return 3;
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else if ((code & 0xffe00000) == 0) return 4;
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#ifndef USE_RFC3629_RANGE
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else if ((code & 0xfc000000) == 0) return 5;
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else if ((code & 0x80000000) == 0) return 6;
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#endif
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#ifdef USE_INVALID_CODE_SCHEME
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else if (code == INVALID_CODE_FE) return 1;
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else if (code == INVALID_CODE_FF) return 1;
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#endif
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else
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return ONIGERR_INVALID_CODE_POINT_VALUE;
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}
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static int
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code_to_mbc(OnigCodePoint code, UChar *buf)
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{
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#define UTF8_TRAILS(code, shift) (UChar )((((code) >> (shift)) & 0x3f) | 0x80)
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#define UTF8_TRAIL0(code) (UChar )(((code) & 0x3f) | 0x80)
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if ((code & 0xffffff80) == 0) {
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*buf = (UChar )code;
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return 1;
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}
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else {
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UChar *p = buf;
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if ((code & 0xfffff800) == 0) {
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*p++ = (UChar )(((code>>6)& 0x1f) | 0xc0);
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}
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else if ((code & 0xffff0000) == 0) {
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*p++ = (UChar )(((code>>12) & 0x0f) | 0xe0);
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*p++ = UTF8_TRAILS(code, 6);
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}
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else if ((code & 0xffe00000) == 0) {
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*p++ = (UChar )(((code>>18) & 0x07) | 0xf0);
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*p++ = UTF8_TRAILS(code, 12);
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*p++ = UTF8_TRAILS(code, 6);
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}
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#ifndef USE_RFC3629_RANGE
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else if ((code & 0xfc000000) == 0) {
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*p++ = (UChar )(((code>>24) & 0x03) | 0xf8);
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*p++ = UTF8_TRAILS(code, 18);
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*p++ = UTF8_TRAILS(code, 12);
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*p++ = UTF8_TRAILS(code, 6);
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}
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else if ((code & 0x80000000) == 0) {
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*p++ = (UChar )(((code>>30) & 0x01) | 0xfc);
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*p++ = UTF8_TRAILS(code, 24);
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*p++ = UTF8_TRAILS(code, 18);
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*p++ = UTF8_TRAILS(code, 12);
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*p++ = UTF8_TRAILS(code, 6);
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}
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#endif
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#ifdef USE_INVALID_CODE_SCHEME
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else if (code == INVALID_CODE_FE) {
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*p = 0xfe;
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return 1;
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}
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else if (code == INVALID_CODE_FF) {
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*p = 0xff;
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return 1;
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}
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#endif
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else {
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return ONIGERR_TOO_BIG_WIDE_CHAR_VALUE;
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}
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*p++ = UTF8_TRAIL0(code);
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return (int )(p - buf);
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}
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}
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static int
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mbc_case_fold(OnigCaseFoldType flag, const UChar** pp,
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const UChar* end, UChar* fold)
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{
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const UChar* p = *pp;
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if (ONIGENC_IS_MBC_ASCII(p)) {
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#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
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if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
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if (*p == 0x49) {
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*fold++ = 0xc4;
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*fold = 0xb1;
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(*pp)++;
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return 2;
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}
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}
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#endif
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*fold = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
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(*pp)++;
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return 1; /* return byte length of converted char to lower */
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}
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else {
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return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF8, flag,
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pp, end, fold);
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}
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}
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static int
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get_ctype_code_range(OnigCtype ctype, OnigCodePoint *sb_out,
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const OnigCodePoint* ranges[])
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{
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*sb_out = 0x80;
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return onigenc_unicode_ctype_code_range(ctype, ranges);
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}
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static UChar*
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left_adjust_char_head(const UChar* start, const UChar* s)
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{
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const UChar *p;
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if (s <= start) return (UChar* )s;
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p = s;
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while (!utf8_islead(*p) && p > start) p--;
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return (UChar* )p;
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}
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static int
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get_case_fold_codes_by_str(OnigCaseFoldType flag,
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const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
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{
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return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF8,
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flag, p, end, items);
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}
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OnigEncodingType OnigEncodingUTF8 = {
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mbc_enc_len,
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"UTF-8", /* name */
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#ifdef USE_RFC3629_RANGE
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4, /* max enc length */
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#else
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6,
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#endif
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1, /* min enc length */
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onigenc_is_mbc_newline_0x0a,
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mbc_to_code,
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code_to_mbclen,
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code_to_mbc,
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mbc_case_fold,
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onigenc_unicode_apply_all_case_fold,
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get_case_fold_codes_by_str,
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onigenc_unicode_property_name_to_ctype,
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onigenc_unicode_is_code_ctype,
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get_ctype_code_range,
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left_adjust_char_head,
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onigenc_always_true_is_allowed_reverse_match,
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NULL, /* init */
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NULL, /* is_initialized */
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is_valid_mbc_string,
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ENC_FLAG_ASCII_COMPATIBLE|ENC_FLAG_UNICODE|ENC_FLAG_SKIP_OFFSET_1_OR_0,
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0, 0
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};
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