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237 lines
6.1 KiB
C
237 lines
6.1 KiB
C
/*
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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_cn.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_euc_cn.h"
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#include "unicode_table_cp936.h"
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static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter);
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static const unsigned char mblen_table_euccn[] = { /* 0xA1-0xFE */
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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, 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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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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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, 1
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};
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static const char *mbfl_encoding_euc_cn_aliases[] = {"CN-GB", "EUC_CN", "eucCN", "x-euc-cn", "gb2312", NULL};
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const mbfl_encoding mbfl_encoding_euc_cn = {
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mbfl_no_encoding_euc_cn,
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"EUC-CN",
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"CN-GB",
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(const char *(*)[])&mbfl_encoding_euc_cn_aliases,
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mblen_table_euccn,
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MBFL_ENCTYPE_MBCS
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};
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const struct mbfl_identify_vtbl vtbl_identify_euccn = {
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mbfl_no_encoding_euc_cn,
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mbfl_filt_ident_common_ctor,
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mbfl_filt_ident_common_dtor,
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mbfl_filt_ident_euccn
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};
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const struct mbfl_convert_vtbl vtbl_euccn_wchar = {
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mbfl_no_encoding_euc_cn,
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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_euccn_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_euccn = {
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mbfl_no_encoding_wchar,
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mbfl_no_encoding_euc_cn,
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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_euccn,
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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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* EUC-CN => wchar
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*/
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int
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mbfl_filt_conv_euccn_wchar(int c, mbfl_convert_filter *filter)
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{
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int c1, w;
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switch (filter->status) {
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case 0:
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if (c >= 0 && c < 0x80) { /* latin */
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CK((*filter->output_function)(c, filter->data));
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} else if (c > 0xa0 && c < 0xff) { /* dbcs lead byte */
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filter->status = 1;
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filter->cache = c;
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} else {
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w = c & MBFL_WCSGROUP_MASK;
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w |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(w, filter->data));
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}
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break;
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case 1: /* dbcs second byte */
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filter->status = 0;
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c1 = filter->cache;
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if (c1 > 0xa0 && c1 < 0xff && c > 0xa0 && c < 0xff) {
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w = (c1 - 0x81)*192 + (c - 0x40);
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if (w >= 0 && w < cp936_ucs_table_size) {
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w = cp936_ucs_table[w];
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} else {
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w = 0;
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}
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if (w <= 0) {
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w = (c1 << 8) | c;
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w &= MBFL_WCSPLANE_MASK;
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w |= MBFL_WCSPLANE_GB2312;
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}
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CK((*filter->output_function)(w, filter->data));
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} else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
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CK((*filter->output_function)(c, filter->data));
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} else {
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w = (c1 << 8) | c;
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w &= MBFL_WCSGROUP_MASK;
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w |= MBFL_WCSGROUP_THROUGH;
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CK((*filter->output_function)(w, filter->data));
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}
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break;
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default:
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filter->status = 0;
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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 => EUC-CN
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*/
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int
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mbfl_filt_conv_wchar_euccn(int c, mbfl_convert_filter *filter)
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{
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int c1, c2, s;
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s = 0;
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if (c >= ucs_a1_cp936_table_min && c < ucs_a1_cp936_table_max) {
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s = ucs_a1_cp936_table[c - ucs_a1_cp936_table_min];
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} else if (c >= ucs_a2_cp936_table_min && c < ucs_a2_cp936_table_max) {
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s = ucs_a2_cp936_table[c - ucs_a2_cp936_table_min];
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} else if (c >= ucs_a3_cp936_table_min && c < ucs_a3_cp936_table_max) {
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s = ucs_a3_cp936_table[c - ucs_a3_cp936_table_min];
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} else if (c >= ucs_i_cp936_table_min && c < ucs_i_cp936_table_max) {
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s = ucs_i_cp936_table[c - ucs_i_cp936_table_min];
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} else if (c >= ucs_hff_cp936_table_min && c < ucs_hff_cp936_table_max) {
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s = ucs_hff_cp936_table[c - ucs_hff_cp936_table_min];
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}
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c1 = (s >> 8) & 0xff;
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c2 = s & 0xff;
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if (c1 < 0xa1 || c2 < 0xa1) { /* exclude CP936 extension */
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s = c;
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}
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if (s <= 0) {
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c1 = c & ~MBFL_WCSPLANE_MASK;
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if (c1 == MBFL_WCSPLANE_GB2312) {
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s = c & MBFL_WCSPLANE_MASK;
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}
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if (c == 0) {
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s = 0;
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} else if (s <= 0) {
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s = -1;
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}
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}
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if (s >= 0) {
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if (s < 0x80) { /* latin */
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CK((*filter->output_function)(s, filter->data));
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} else {
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CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
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CK((*filter->output_function)(s & 0xff, filter->data));
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}
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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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static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter)
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{
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switch (filter->status) {
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case 0: /* latin */
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if (c >= 0 && c < 0x80) { /* ok */
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;
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} else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */
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filter->status = 1;
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} else { /* bad */
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filter->flag = 1;
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}
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break;
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case 1: /* got lead byte */
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if (c < 0xa1 || c > 0xfe) { /* bad */
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filter->flag = 1;
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}
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filter->status = 0;
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break;
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default:
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filter->status = 0;
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break;
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}
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return c;
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}
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