utf_16be.c
Go to the documentation of this file.
/**********************************************************************
utf_16be.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"
#define UTF16_IS_SURROGATE_FIRST(c) (((c) & 0xfc) == 0xd8)
#define UTF16_IS_SURROGATE_SECOND(c) (((c) & 0xfc) == 0xdc)
#define UTF16_IS_SURROGATE(c) (((c) & 0xf8) == 0xd8)
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
utf16be_mbc_enc_len(const UChar* p, const OnigUChar* e ARG_UNUSED,
OnigEncoding enc ARG_UNUSED)
{
int byte = p[0];
if (!UTF16_IS_SURROGATE(byte)) {
if (2 <= e-p)
return ONIGENC_CONSTRUCT_MBCLEN_CHARFOUND(2);
else
return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(1);
}
if (UTF16_IS_SURROGATE_FIRST(byte)) {
switch (e-p) {
case 1: return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(3);
case 2: return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(2);
case 3:
if (UTF16_IS_SURROGATE_SECOND(p[2]))
return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(1);
break;
default:
if (UTF16_IS_SURROGATE_SECOND(p[2]))
return ONIGENC_CONSTRUCT_MBCLEN_CHARFOUND(4);
break;
}
}
return ONIGENC_CONSTRUCT_MBCLEN_INVALID();
}
static int
utf16be_is_mbc_newline(const UChar* p, const UChar* end,
OnigEncoding enc)
{
if (p + 1 < end) {
if (*(p+1) == 0x0a && *p == 0x00)
return 1;
#ifdef USE_UNICODE_ALL_LINE_TERMINATORS
if ((
#ifndef USE_CRNL_AS_LINE_TERMINATOR
*(p+1) == 0x0d ||
#endif
*(p+1) == 0x85) && *p == 0x00)
return 1;
if (*p == 0x20 && (*(p+1) == 0x29 || *(p+1) == 0x28))
return 1;
#endif
}
return 0;
}
static OnigCodePoint
utf16be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED,
OnigEncoding enc)
{
OnigCodePoint code;
if (UTF16_IS_SURROGATE_FIRST(*p)) {
code = ((((p[0] << 8) + p[1]) & 0x03ff) << 10)
+ (((p[2] << 8) + p[3]) & 0x03ff) + 0x10000;
}
else {
code = p[0] * 256 + p[1];
}
return code;
}
static int
utf16be_code_to_mbclen(OnigCodePoint code,
OnigEncoding enc)
{
return (code > 0xffff ? 4 : 2);
}
static int
utf16be_code_to_mbc(OnigCodePoint code, UChar *buf,
OnigEncoding enc)
{
UChar* p = buf;
if (code > 0xffff) {
unsigned int high = (code >> 10) + 0xD7C0;
unsigned int low = (code & 0x3FF) + 0xDC00;
*p++ = (high >> 8) & 0xFF;
*p++ = high & 0xFF;
*p++ = (low >> 8) & 0xFF;
*p++ = low & 0xFF;
return 4;
}
else {
*p++ = (UChar )((code & 0xff00) >> 8);
*p++ = (UChar )(code & 0xff);
return 2;
}
}
static int
utf16be_mbc_case_fold(OnigCaseFoldType flag,
const UChar** pp, const UChar* end, UChar* fold,
OnigEncoding enc)
{
const UChar* p = *pp;
if (ONIGENC_IS_ASCII_CODE(*(p+1)) && *p == 0) {
p++;
#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
if (*p == 0x49) {
*fold++ = 0x01;
*fold = 0x31;
(*pp) += 2;
return 2;
}
}
#endif
*fold++ = 0;
*fold = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
*pp += 2;
return 2;
}
else
return onigenc_unicode_mbc_case_fold(enc, flag,
pp, end, fold);
}
#if 0
static int
utf16be_is_mbc_ambiguous(OnigCaseFoldType flag, const UChar** pp, const UChar* end)
{
const UChar* p = *pp;
(*pp) += EncLen_UTF16[*p];
if (*p == 0) {
int c, v;
p++;
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*
utf16be_left_adjust_char_head(const UChar* start, const UChar* s, const UChar* end,
OnigEncoding enc ARG_UNUSED)
{
if (s <= start) return (UChar* )s;
if ((s - start) % 2 == 1) {
s--;
}
if (UTF16_IS_SURROGATE_SECOND(*s) && s > start + 1)
s -= 2;
return (UChar* )s;
}
static int
utf16be_get_case_fold_codes_by_str(OnigCaseFoldType flag,
const OnigUChar* p, const OnigUChar* end,
OnigCaseFoldCodeItem items[],
OnigEncoding enc)
{
return onigenc_unicode_get_case_fold_codes_by_str(enc,
flag, p, end, items);
}
OnigEncodingDefine(utf_16be, UTF_16BE) = {
utf16be_mbc_enc_len,
"UTF-16BE", /* name */
4, /* max byte length */
2, /* min byte length */
utf16be_is_mbc_newline,
utf16be_mbc_to_code,
utf16be_code_to_mbclen,
utf16be_code_to_mbc,
utf16be_mbc_case_fold,
onigenc_unicode_apply_all_case_fold,
utf16be_get_case_fold_codes_by_str,
onigenc_unicode_property_name_to_ctype,
onigenc_unicode_is_code_ctype,
onigenc_utf16_32_get_ctype_code_range,
utf16be_left_adjust_char_head,
onigenc_always_false_is_allowed_reverse_match
};
ENC_ALIAS("UCS-2BE", "UTF-16BE")