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+/**********************************************************************
+ utf8.c - Oniguruma (regular expression library)
+**********************************************************************/
+/*-
+ * Copyright (c) 2002-2016 K.Kosako <sndgk393 AT ybb DOT ne DOT jp>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "regenc.h"
+
+#define USE_INVALID_CODE_SCHEME
+
+#ifdef USE_INVALID_CODE_SCHEME
+/* virtual codepoint values for invalid encoding byte 0xfe and 0xff */
+#define INVALID_CODE_FE 0xfffffffe
+#define INVALID_CODE_FF 0xffffffff
+#define VALID_CODE_LIMIT 0x7fffffff
+#endif
+
+#define utf8_islead(c) ((UChar )((c) & 0xc0) != 0x80)
+
+static const int EncLen_UTF8[] = {
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1
+};
+
+static int
+mbc_enc_len(const UChar* p)
+{
+ return EncLen_UTF8[*p];
+}
+
+static int
+is_mbc_newline(const UChar* p, const UChar* end)
+{
+ if (p < end) {
+ if (*p == 0x0a) return 1;
+
+#ifdef USE_UNICODE_ALL_LINE_TERMINATORS
+#ifndef USE_CRNL_AS_LINE_TERMINATOR
+ if (*p == 0x0d) return 1;
+#endif
+ if (p + 1 < end) {
+ if (*(p+1) == 0x85 && *p == 0xc2) /* U+0085 */
+ return 1;
+ if (p + 2 < end) {
+ if ((*(p+2) == 0xa8 || *(p+2) == 0xa9)
+ && *(p+1) == 0x80 && *p == 0xe2) /* U+2028, U+2029 */
+ return 1;
+ }
+ }
+#endif
+ }
+
+ return 0;
+}
+
+static OnigCodePoint
+mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
+{
+ int c, len;
+ OnigCodePoint n;
+
+ len = enclen(ONIG_ENCODING_UTF8, p);
+ c = *p++;
+ if (len > 1) {
+ len--;
+ n = c & ((1 << (6 - len)) - 1);
+ while (len--) {
+ c = *p++;
+ n = (n << 6) | (c & ((1 << 6) - 1));
+ }
+ return n;
+ }
+ else {
+#ifdef USE_INVALID_CODE_SCHEME
+ if (c > 0xfd) {
+ return ((c == 0xfe) ? INVALID_CODE_FE : INVALID_CODE_FF);
+ }
+#endif
+ return (OnigCodePoint )c;
+ }
+}
+
+static int
+code_to_mbclen(OnigCodePoint code)
+{
+ if ((code & 0xffffff80) == 0) return 1;
+ else if ((code & 0xfffff800) == 0) return 2;
+ else if ((code & 0xffff0000) == 0) return 3;
+ else if ((code & 0xffe00000) == 0) return 4;
+ else if ((code & 0xfc000000) == 0) return 5;
+ else if ((code & 0x80000000) == 0) return 6;
+#ifdef USE_INVALID_CODE_SCHEME
+ else if (code == INVALID_CODE_FE) return 1;
+ else if (code == INVALID_CODE_FF) return 1;
+#endif
+ else
+ return ONIGERR_INVALID_CODE_POINT_VALUE;
+}
+
+static int
+code_to_mbc(OnigCodePoint code, UChar *buf)
+{
+#define UTF8_TRAILS(code, shift) (UChar )((((code) >> (shift)) & 0x3f) | 0x80)
+#define UTF8_TRAIL0(code) (UChar )(((code) & 0x3f) | 0x80)
+
+ if ((code & 0xffffff80) == 0) {
+ *buf = (UChar )code;
+ return 1;
+ }
+ else {
+ UChar *p = buf;
+
+ if ((code & 0xfffff800) == 0) {
+ *p++ = (UChar )(((code>>6)& 0x1f) | 0xc0);
+ }
+ else if ((code & 0xffff0000) == 0) {
+ *p++ = (UChar )(((code>>12) & 0x0f) | 0xe0);
+ *p++ = UTF8_TRAILS(code, 6);
+ }
+ else if ((code & 0xffe00000) == 0) {
+ *p++ = (UChar )(((code>>18) & 0x07) | 0xf0);
+ *p++ = UTF8_TRAILS(code, 12);
+ *p++ = UTF8_TRAILS(code, 6);
+ }
+ else if ((code & 0xfc000000) == 0) {
+ *p++ = (UChar )(((code>>24) & 0x03) | 0xf8);
+ *p++ = UTF8_TRAILS(code, 18);
+ *p++ = UTF8_TRAILS(code, 12);
+ *p++ = UTF8_TRAILS(code, 6);
+ }
+ else if ((code & 0x80000000) == 0) {
+ *p++ = (UChar )(((code>>30) & 0x01) | 0xfc);
+ *p++ = UTF8_TRAILS(code, 24);
+ *p++ = UTF8_TRAILS(code, 18);
+ *p++ = UTF8_TRAILS(code, 12);
+ *p++ = UTF8_TRAILS(code, 6);
+ }
+#ifdef USE_INVALID_CODE_SCHEME
+ else if (code == INVALID_CODE_FE) {
+ *p = 0xfe;
+ return 1;
+ }
+ else if (code == INVALID_CODE_FF) {
+ *p = 0xff;
+ return 1;
+ }
+#endif
+ else {
+ return ONIGERR_TOO_BIG_WIDE_CHAR_VALUE;
+ }
+
+ *p++ = UTF8_TRAIL0(code);
+ return p - buf;
+ }
+}
+
+static int
+mbc_case_fold(OnigCaseFoldType flag, const UChar** pp,
+ const UChar* end, UChar* fold)
+{
+ const UChar* p = *pp;
+
+ if (ONIGENC_IS_MBC_ASCII(p)) {
+#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
+ if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
+ if (*p == 0x49) {
+ *fold++ = 0xc4;
+ *fold = 0xb1;
+ (*pp)++;
+ return 2;
+ }
+ }
+#endif
+
+ *fold = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
+ (*pp)++;
+ return 1; /* return byte length of converted char to lower */
+ }
+ else {
+ return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF8, flag,
+ pp, end, fold);
+ }
+}
+
+#if 0
+static int
+is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
+{
+ const UChar* p = *pp;
+
+ if (ONIGENC_IS_MBC_ASCII(p)) {
+ (*pp)++;
+ return ONIGENC_IS_ASCII_CODE_CASE_AMBIG(*p);
+ }
+ else {
+ (*pp) += enclen(ONIG_ENCODING_UTF8, p);
+
+ if (*p == 0xc3) {
+ int c = *(p + 1);
+ if (c >= 0x80) {
+ if (c <= (UChar )0x9e) { /* upper */
+ if (c == (UChar )0x97) return FALSE;
+ return TRUE;
+ }
+ else if (c >= (UChar )0xa0 && c <= (UChar )0xbe) { /* lower */
+ if (c == (UChar )'\267') return FALSE;
+ return TRUE;
+ }
+ else if (c == (UChar )0x9f &&
+ (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
+ return TRUE;
+ }
+ }
+ }
+ }
+
+ return FALSE;
+}
+#endif
+
+
+static int
+get_ctype_code_range(OnigCtype ctype, OnigCodePoint *sb_out,
+ const OnigCodePoint* ranges[])
+{
+ *sb_out = 0x80;
+ return onigenc_unicode_ctype_code_range(ctype, ranges);
+}
+
+
+static UChar*
+left_adjust_char_head(const UChar* start, const UChar* s)
+{
+ const UChar *p;
+
+ if (s <= start) return (UChar* )s;
+ p = s;
+
+ while (!utf8_islead(*p) && p > start) p--;
+ return (UChar* )p;
+}
+
+static int
+get_case_fold_codes_by_str(OnigCaseFoldType flag,
+ const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
+{
+ return onigenc_unicode_get_case_fold_codes_by_str(ONIG_ENCODING_UTF8,
+ flag, p, end, items);
+}
+
+OnigEncodingType OnigEncodingUTF8 = {
+ mbc_enc_len,
+ "UTF-8", /* name */
+ 6, /* max byte length */
+ 1, /* min byte length */
+ is_mbc_newline,
+ mbc_to_code,
+ code_to_mbclen,
+ code_to_mbc,
+ mbc_case_fold,
+ onigenc_unicode_apply_all_case_fold,
+ get_case_fold_codes_by_str,
+ onigenc_unicode_property_name_to_ctype,
+ onigenc_unicode_is_code_ctype,
+ get_ctype_code_range,
+ left_adjust_char_head,
+ onigenc_always_true_is_allowed_reverse_match,
+ NULL, /* init */
+ NULL /* is_initialized */
+};
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