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Diffstat (limited to 'enc/utf16_le.c')
| -rw-r--r-- | enc/utf16_le.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/enc/utf16_le.c b/enc/utf16_le.c new file mode 100644 index 0000000..5cc0759 --- /dev/null +++ b/enc/utf16_le.c @@ -0,0 +1,226 @@ +/********************************************************************** + utf16_le.c - Oniguruma (regular expression library) +**********************************************************************/ +/*- + * Copyright (c) 2002-2008 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" + +static const int EncLen_UTF16[] = { + 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, + 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, + 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, + 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, + 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, + 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, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 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, 2, 2, 2, 2 +}; + +static int +utf16le_code_to_mbclen(OnigCodePoint code) +{ + return (code > 0xffff ? 4 : 2); +} + +static int +utf16le_mbc_enc_len(const UChar* p) +{ + return EncLen_UTF16[*(p+1)]; +} + +static int +utf16le_is_mbc_newline(const UChar* p, const UChar* end) +{ + if (p + 1 < end) { + if (*p == 0x0a && *(p+1) == 0x00) + return 1; +#ifdef USE_UNICODE_ALL_LINE_TERMINATORS + if (( +#ifndef USE_CRNL_AS_LINE_TERMINATOR + *p == 0x0d || +#endif + *p == 0x85) && *(p+1) == 0x00) + return 1; + if (*(p+1) == 0x20 && (*p == 0x29 || *p == 0x28)) + return 1; +#endif + } + return 0; +} + +static OnigCodePoint +utf16le_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED) +{ + OnigCodePoint code; + UChar c0 = *p; + UChar c1 = *(p+1); + + if (UTF16_IS_SURROGATE_FIRST(c1)) { + code = ((((c1 - 0xd8) << 2) + ((c0 & 0xc0) >> 6) + 1) << 16) + + ((((c0 & 0x3f) << 2) + (p[3] - 0xdc)) << 8) + + p[2]; + } + else { + code = c1 * 256 + p[0]; + } + return code; +} + +static int +utf16le_code_to_mbc(OnigCodePoint code, UChar *buf) +{ + UChar* p = buf; + + if (code > 0xffff) { + unsigned int plane, high; + + plane = (code >> 16) - 1; + high = (code & 0xff00) >> 8; + + *p++ = ((plane & 0x03) << 6) + (high >> 2); + *p++ = (plane >> 2) + 0xd8; + *p++ = (UChar )(code & 0xff); + *p = (high & 0x03) + 0xdc; + return 4; + } + else { + *p++ = (UChar )(code & 0xff); + *p++ = (UChar )((code & 0xff00) >> 8); + return 2; + } +} + +static int +utf16le_mbc_case_fold(OnigCaseFoldType flag, + const UChar** pp, const UChar* end, UChar* fold) +{ + const UChar* p = *pp; + + if (ONIGENC_IS_ASCII_CODE(*p) && *(p+1) == 0) { +#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI + if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) { + if (*p == 0x49) { + *fold++ = 0x31; + *fold = 0x01; + (*pp) += 2; + return 2; + } + } +#endif + + *fold++ = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p); + *fold = 0; + *pp += 2; + return 2; + } + else + return onigenc_unicode_mbc_case_fold(ONIG_ENCODING_UTF16_LE, flag, pp, end, + fold); +} + +#if 0 +static int +utf16le_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, + const UChar* end) +{ + const UChar* p = *pp; + + (*pp) += EncLen_UTF16[*(p+1)]; + + if (*(p+1) == 0) { + int c, v; + + if (*p == 0xdf && (flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) { + return TRUE; + } + + c = *p; + v = ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(c, + (BIT_CTYPE_UPPER | BIT_CTYPE_LOWER)); + if ((v | BIT_CTYPE_LOWER) != 0) { + /* 0xaa, 0xb5, 0xba are lower case letter, but can't convert. */ + if (c >= 0xaa && c <= 0xba) + return FALSE; + else + return TRUE; + } + return (v != 0 ? TRUE : FALSE); + } + + return FALSE; +} +#endif + +static UChar* +utf16le_left_adjust_char_head(const UChar* start, const UChar* s) +{ + if (s <= start) return (UChar* )s; + + if ((s - start) % 2 == 1) { + s--; + } + + if (UTF16_IS_SURROGATE_SECOND(*(s+1)) && s > start + 1) + s -= 2; + + return (UChar* )s; +} + +static int +utf16le_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_UTF16_LE, + flag, p, end, items); +} + +OnigEncodingType OnigEncodingUTF16_LE = { + utf16le_mbc_enc_len, + "UTF-16LE", /* name */ + 4, /* max byte length */ + 2, /* min byte length */ + utf16le_is_mbc_newline, + utf16le_mbc_to_code, + utf16le_code_to_mbclen, + utf16le_code_to_mbc, + utf16le_mbc_case_fold, + onigenc_unicode_apply_all_case_fold, + utf16le_get_case_fold_codes_by_str, + onigenc_unicode_property_name_to_ctype, + onigenc_unicode_is_code_ctype, + onigenc_utf16_32_get_ctype_code_range, + utf16le_left_adjust_char_head, + onigenc_always_false_is_allowed_reverse_match +}; |