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310 lines
7.6 KiB
C
310 lines
7.6 KiB
C
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/*
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* "streamable kanji code filter and converter"
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* Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
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*
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* LICENSE NOTICES
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*
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* This file is part of "streamable kanji code filter and converter",
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* which is distributed under the terms of GNU Lesser General Public
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* License (version 2) as published by the Free Software Foundation.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with "streamable kanji code filter and converter";
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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* Suite 330, Boston, MA 02111-1307 USA
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*
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* The author of this file:
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*
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*/
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/*
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* The source code included in this files was separated from mbfilter.c
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* by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "mbfilter.h"
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#include "mbfilter_utf16.h"
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static const char *mbfl_encoding_utf16_aliases[] = {"utf16", NULL};
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const mbfl_encoding mbfl_encoding_utf16 = {
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mbfl_no_encoding_utf16,
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"UTF-16",
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"UTF-16",
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(const char *(*)[])&mbfl_encoding_utf16_aliases,
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NULL,
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MBFL_ENCTYPE_MWC2BE
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};
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const mbfl_encoding mbfl_encoding_utf16be = {
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mbfl_no_encoding_utf16be,
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"UTF-16BE",
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"UTF-16BE",
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NULL,
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NULL,
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MBFL_ENCTYPE_MWC2BE
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};
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const mbfl_encoding mbfl_encoding_utf16le = {
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mbfl_no_encoding_utf16le,
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"UTF-16LE",
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"UTF-16LE",
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NULL,
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NULL,
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MBFL_ENCTYPE_MWC2LE
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};
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const struct mbfl_convert_vtbl vtbl_utf16_wchar = {
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mbfl_no_encoding_utf16,
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mbfl_no_encoding_wchar,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_utf16_wchar,
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mbfl_filt_conv_common_flush
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};
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const struct mbfl_convert_vtbl vtbl_wchar_utf16 = {
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mbfl_no_encoding_wchar,
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mbfl_no_encoding_utf16,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_wchar_utf16be,
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mbfl_filt_conv_common_flush
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};
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const struct mbfl_convert_vtbl vtbl_utf16be_wchar = {
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mbfl_no_encoding_utf16be,
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mbfl_no_encoding_wchar,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_utf16be_wchar,
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mbfl_filt_conv_common_flush
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};
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const struct mbfl_convert_vtbl vtbl_wchar_utf16be = {
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mbfl_no_encoding_wchar,
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mbfl_no_encoding_utf16be,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_wchar_utf16be,
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mbfl_filt_conv_common_flush
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};
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const struct mbfl_convert_vtbl vtbl_utf16le_wchar = {
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mbfl_no_encoding_utf16le,
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mbfl_no_encoding_wchar,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_utf16le_wchar,
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mbfl_filt_conv_common_flush
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};
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const struct mbfl_convert_vtbl vtbl_wchar_utf16le = {
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mbfl_no_encoding_wchar,
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mbfl_no_encoding_utf16le,
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mbfl_filt_conv_common_ctor,
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mbfl_filt_conv_common_dtor,
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mbfl_filt_conv_wchar_utf16le,
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mbfl_filt_conv_common_flush
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};
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#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
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/*
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* UTF-16 => wchar
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*/
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int mbfl_filt_conv_utf16_wchar(int c, mbfl_convert_filter *filter)
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{
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int n, endian;
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endian = filter->status & 0xff00;
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switch (filter->status & 0xff) {
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case 0:
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if (endian) {
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n = c & 0xff;
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} else {
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n = (c & 0xff) << 8;
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}
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filter->cache |= n;
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filter->status++;
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break;
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default:
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if (endian) {
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n = (c & 0xff) << 8;
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} else {
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n = c & 0xff;
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}
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n |= filter->cache & 0xffff;
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filter->status &= ~0xff;
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if (n == 0xfffe) {
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if (endian) {
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filter->status = 0; /* big-endian */
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} else {
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filter->status = 0x100; /* little-endian */
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}
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CK((*filter->output_function)(0xfeff, filter->data));
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} else if (n >= 0xd800 && n < 0xdc00) {
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filter->cache = ((n & 0x3ff) << 16) + 0x400000;
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} else if (n >= 0xdc00 && n < 0xe000) {
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n &= 0x3ff;
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n |= (filter->cache & 0xfff0000) >> 6;
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filter->cache = 0;
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if (n >= MBFL_WCSPLANE_SUPMIN && n < MBFL_WCSPLANE_SUPMAX) {
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CK((*filter->output_function)(n, filter->data));
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} else { /* illegal character */
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n &= MBFL_WCSGROUP_MASK;
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n |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(n, filter->data));
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}
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} else {
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filter->cache = 0;
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CK((*filter->output_function)(n, filter->data));
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}
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break;
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}
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return c;
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}
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/*
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* UTF-16BE => wchar
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*/
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int mbfl_filt_conv_utf16be_wchar(int c, mbfl_convert_filter *filter)
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{
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int n;
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switch (filter->status) {
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case 0:
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filter->status = 1;
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n = (c & 0xff) << 8;
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filter->cache |= n;
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break;
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default:
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filter->status = 0;
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n = (filter->cache & 0xff00) | (c & 0xff);
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if (n >= 0xd800 && n < 0xdc00) {
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filter->cache = ((n & 0x3ff) << 16) + 0x400000;
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} else if (n >= 0xdc00 && n < 0xe000) {
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n &= 0x3ff;
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n |= (filter->cache & 0xfff0000) >> 6;
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filter->cache = 0;
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if (n >= MBFL_WCSPLANE_SUPMIN && n < MBFL_WCSPLANE_SUPMAX) {
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CK((*filter->output_function)(n, filter->data));
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} else { /* illegal character */
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n &= MBFL_WCSGROUP_MASK;
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n |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(n, filter->data));
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}
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} else {
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filter->cache = 0;
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CK((*filter->output_function)(n, filter->data));
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}
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break;
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}
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return c;
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}
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/*
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* wchar => UTF-16BE
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*/
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int mbfl_filt_conv_wchar_utf16be(int c, mbfl_convert_filter *filter)
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{
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int n;
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if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
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CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
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CK((*filter->output_function)(c & 0xff, filter->data));
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} else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
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n = ((c >> 10) - 0x40) | 0xd800;
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CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
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CK((*filter->output_function)(n & 0xff, filter->data));
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n = (c & 0x3ff) | 0xdc00;
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CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
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CK((*filter->output_function)(n & 0xff, filter->data));
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} else {
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if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
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CK(mbfl_filt_conv_illegal_output(c, filter));
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}
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}
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return c;
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}
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/*
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* UTF-16LE => wchar
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*/
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int mbfl_filt_conv_utf16le_wchar(int c, mbfl_convert_filter *filter)
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{
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int n;
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switch (filter->status) {
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case 0:
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filter->status = 1;
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n = c & 0xff;
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filter->cache |= n;
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break;
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default:
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filter->status = 0;
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n = (filter->cache & 0xff) | ((c & 0xff) << 8);
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if (n >= 0xd800 && n < 0xdc00) {
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filter->cache = ((n & 0x3ff) << 16) + 0x400000;
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} else if (n >= 0xdc00 && n < 0xe000) {
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n &= 0x3ff;
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n |= (filter->cache & 0xfff0000) >> 6;
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filter->cache = 0;
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if (n >= MBFL_WCSPLANE_SUPMIN && n < MBFL_WCSPLANE_SUPMAX) {
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CK((*filter->output_function)(n, filter->data));
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} else { /* illegal character */
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n &= MBFL_WCSGROUP_MASK;
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n |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(n, filter->data));
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}
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} else {
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filter->cache = 0;
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CK((*filter->output_function)(n, filter->data));
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}
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break;
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}
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return c;
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}
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/*
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* wchar => UTF-16LE
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*/
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int mbfl_filt_conv_wchar_utf16le(int c, mbfl_convert_filter *filter)
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{
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int n;
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if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
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CK((*filter->output_function)(c & 0xff, filter->data));
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CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
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} else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
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n = ((c >> 10) - 0x40) | 0xd800;
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CK((*filter->output_function)(n & 0xff, filter->data));
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CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
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n = (c & 0x3ff) | 0xdc00;
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CK((*filter->output_function)(n & 0xff, filter->data));
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CK((*filter->output_function)((n >> 8) & 0xff, filter->data));
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} else {
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if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
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CK(mbfl_filt_conv_illegal_output(c, filter));
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}
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}
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return c;
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}
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