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/*
* "streamable kanji code filter and converter"
* Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
*
* LICENSE NOTICES
*
* This file is part of "streamable kanji code filter and converter",
* which is distributed under the terms of GNU Lesser General Public
* License (version 2) as published by the Free Software Foundation.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with "streamable kanji code filter and converter";
* if not, write to the Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*
* The author of this file:
*
*/
/*
* The source code included in this files was separated from mbfilter_cn.c
* by Moriyoshi Koizumi <moriyoshi@php.net> on 4 Dec 2002.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mbfilter.h"
#include "mbfilter_euc_cn.h"
#include "unicode_table_cp936.h"
static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter);
static const unsigned char mblen_table_euccn[] = { /* 0xA1-0xFE */
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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
};
static const char *mbfl_encoding_euc_cn_aliases[] = {"CN-GB", "EUC_CN", "eucCN", "x-euc-cn", "gb2312", NULL};
const mbfl_encoding mbfl_encoding_euc_cn = {
mbfl_no_encoding_euc_cn,
"EUC-CN",
"CN-GB",
(const char *(*)[])&mbfl_encoding_euc_cn_aliases,
mblen_table_euccn,
MBFL_ENCTYPE_MBCS,
&vtbl_euccn_wchar,
&vtbl_wchar_euccn
};
const struct mbfl_identify_vtbl vtbl_identify_euccn = {
mbfl_no_encoding_euc_cn,
mbfl_filt_ident_common_ctor,
mbfl_filt_ident_common_dtor,
mbfl_filt_ident_euccn
};
const struct mbfl_convert_vtbl vtbl_euccn_wchar = {
mbfl_no_encoding_euc_cn,
mbfl_no_encoding_wchar,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_euccn_wchar,
mbfl_filt_conv_common_flush
};
const struct mbfl_convert_vtbl vtbl_wchar_euccn = {
mbfl_no_encoding_wchar,
mbfl_no_encoding_euc_cn,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_wchar_euccn,
mbfl_filt_conv_common_flush
};
#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
/*
* EUC-CN => wchar
*/
int
mbfl_filt_conv_euccn_wchar(int c, mbfl_convert_filter *filter)
{
int c1, w;
switch (filter->status) {
case 0:
if (c >= 0 && c < 0x80) { /* latin */
CK((*filter->output_function)(c, filter->data));
} else if (c > 0xa0 && c < 0xff) { /* dbcs lead byte */
filter->status = 1;
filter->cache = c;
} else {
w = c & MBFL_WCSGROUP_MASK;
w |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(w, filter->data));
}
break;
case 1: /* dbcs second byte */
filter->status = 0;
c1 = filter->cache;
if (c1 > 0xa0 && c1 < 0xff && c > 0xa0 && c < 0xff) {
w = (c1 - 0x81)*192 + (c - 0x40);
if (w >= 0 && w < cp936_ucs_table_size) {
w = cp936_ucs_table[w];
} else {
w = 0;
}
if (w <= 0) {
w = (c1 << 8) | c;
w &= MBFL_WCSPLANE_MASK;
w |= MBFL_WCSPLANE_GB2312;
}
CK((*filter->output_function)(w, filter->data));
} else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
CK((*filter->output_function)(c, filter->data));
} else {
w = (c1 << 8) | c;
w &= MBFL_WCSGROUP_MASK;
w |= MBFL_WCSGROUP_THROUGH;
CK((*filter->output_function)(w, filter->data));
}
break;
default:
filter->status = 0;
break;
}
return c;
}
/*
* wchar => EUC-CN
*/
int
mbfl_filt_conv_wchar_euccn(int c, mbfl_convert_filter *filter)
{
int c1, c2, s;
s = 0;
if (c >= ucs_a1_cp936_table_min && c < ucs_a1_cp936_table_max) {
s = ucs_a1_cp936_table[c - ucs_a1_cp936_table_min];
} else if (c >= ucs_a2_cp936_table_min && c < ucs_a2_cp936_table_max) {
s = ucs_a2_cp936_table[c - ucs_a2_cp936_table_min];
} else if (c >= ucs_a3_cp936_table_min && c < ucs_a3_cp936_table_max) {
s = ucs_a3_cp936_table[c - ucs_a3_cp936_table_min];
} else if (c >= ucs_i_cp936_table_min && c < ucs_i_cp936_table_max) {
s = ucs_i_cp936_table[c - ucs_i_cp936_table_min];
} else if (c >= ucs_hff_cp936_table_min && c < ucs_hff_cp936_table_max) {
if (c == 0xff04) {
s = 0xa1e7;
} else if (c == 0xff5e) {
s = 0xa1ab;
} else if (c >= 0xff01 && c <= 0xff5d) {
s = c - 0xff01 + 0xa3a1;
} else if (c >= 0xffe0 && c <= 0xffe5) {
s = ucs_hff_s_cp936_table[c-0xffe0];
}
}
c1 = (s >> 8) & 0xff;
c2 = s & 0xff;
if (c1 < 0xa1 || c2 < 0xa1) { /* exclude CP936 extension */
s = c;
}
if (s <= 0) {
c1 = c & ~MBFL_WCSPLANE_MASK;
if (c1 == MBFL_WCSPLANE_GB2312) {
s = c & MBFL_WCSPLANE_MASK;
}
if (c == 0) {
s = 0;
} else if (s <= 0) {
s = -1;
}
}
if (s >= 0) {
if (s < 0x80) { /* latin */
CK((*filter->output_function)(s, filter->data));
} else {
CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
CK((*filter->output_function)(s & 0xff, filter->data));
}
} else {
if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
CK(mbfl_filt_conv_illegal_output(c, filter));
}
}
return c;
}
static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter)
{
switch (filter->status) {
case 0: /* latin */
if (c >= 0 && c < 0x80) { /* ok */
;
} else if (c > 0xa0 && c < 0xff) { /* DBCS lead byte */
filter->status = 1;
} else { /* bad */
filter->flag = 1;
}
break;
case 1: /* got lead byte */
if (c < 0xa1 || c > 0xfe) { /* bad */
filter->flag = 1;
}
filter->status = 0;
break;
default:
filter->status = 0;
break;
}
return c;
}
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