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DEFINITIONS
This source file includes following definitions.
- mbfl_filt_conv_2022kr_wchar
- mbfl_filt_conv_wchar_2022kr
- mbfl_filt_conv_any_2022kr_flush
- mbfl_filt_ident_2022kr
/*
* "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_kr.c
* by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mbfilter.h"
#include "mbfilter_iso2022_kr.h"
#include "unicode_table_uhc.h"
static int mbfl_filt_ident_2022kr(int c, mbfl_identify_filter *filter);
const mbfl_encoding mbfl_encoding_2022kr = {
mbfl_no_encoding_2022kr,
"ISO-2022-KR",
"ISO-2022-KR",
NULL,
NULL,
MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
};
const struct mbfl_identify_vtbl vtbl_identify_2022kr = {
mbfl_no_encoding_2022kr,
mbfl_filt_ident_common_ctor,
mbfl_filt_ident_common_dtor,
mbfl_filt_ident_2022kr
};
const struct mbfl_convert_vtbl vtbl_wchar_2022kr = {
mbfl_no_encoding_wchar,
mbfl_no_encoding_2022kr,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_wchar_2022kr,
mbfl_filt_conv_any_2022kr_flush
};
const struct mbfl_convert_vtbl vtbl_2022kr_wchar = {
mbfl_no_encoding_2022kr,
mbfl_no_encoding_wchar,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_2022kr_wchar,
mbfl_filt_conv_common_flush
};
#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
/*
* ISO-2022-KR => wchar
*/
int
mbfl_filt_conv_2022kr_wchar(int c, mbfl_convert_filter *filter)
{
int c1, w, flag;
retry:
switch (filter->status & 0xf) {
/* case 0x00: ASCII */
/* case 0x10: KSC5601 */
case 0:
if (c == 0x1b) { /* ESC */
filter->status += 2;
} else if (c == 0x0f) { /* SI (ASCII) */
filter->status &= ~0xff;
} else if (c == 0x0e) { /* SO (KSC5601) */
filter->status |= 0x10;
} else if ((filter->status & 0x10) != 0 && c > 0x20 && c < 0x7f) {
/* KSC5601 lead byte */
filter->cache = c;
filter->status += 1;
} else if ((filter->status & 0x10) == 0 && c >= 0 && c < 0x80) {
/* latin, CTLs */
CK((*filter->output_function)(c, filter->data));
} 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 &= ~0xf;
c1 = filter->cache;
flag = 0;
if (c1 > 0x20 && c1 < 0x47) {
flag = 1;
} else if (c1 >= 0x47 && c1 <= 0x7e && c1 != 0x49) {
flag = 2;
}
if (flag > 0 && c > 0x20 && c < 0x7f) {
if (flag == 1){
w = (c1 - 0x21)*190 + (c - 0x41) + 0x80;
if (w >= 0 && w < uhc2_ucs_table_size) {
w = uhc2_ucs_table[w];
} else {
w = 0;
}
} else {
w = (c1 - 0x47)*94 + (c - 0x21);
if (w >= 0 && w < uhc3_ucs_table_size) {
w = uhc3_ucs_table[w];
} else {
w = 0;
}
}
if (w <= 0) {
w = (c1 << 8) | c;
w &= MBFL_WCSPLANE_MASK;
w |= MBFL_WCSPLANE_KSC5601;
}
CK((*filter->output_function)(w, filter->data));
} else if (c == 0x1b) { /* ESC */
filter->status++;
} 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;
case 2: /* ESC */
if (c == 0x24) { /* '$' */
filter->status++;
} else {
filter->status &= ~0xf;
CK((*filter->output_function)(0x1b, filter->data));
goto retry;
}
break;
case 3: /* ESC $ */
if (c == 0x29) { /* ')' */
filter->status++;
} else {
filter->status &= ~0xf;
CK((*filter->output_function)(0x1b, filter->data));
CK((*filter->output_function)(0x24, filter->data));
goto retry;
}
break;
case 4: /* ESC $ ) */
if (c == 0x43) { /* 'C' */
filter->status &= ~0xf;
filter->status |= 0x100;
} else {
filter->status &= ~0xf;
CK((*filter->output_function)(0x1b, filter->data));
CK((*filter->output_function)(0x24, filter->data));
CK((*filter->output_function)(0x29, filter->data));
goto retry;
}
break;
default:
filter->status = 0;
break;
}
return c;
}
/*
* wchar => ISO-2022-KR
*/
int
mbfl_filt_conv_wchar_2022kr(int c, mbfl_convert_filter *filter)
{
int c1, c2, s;
s = 0;
if (c >= ucs_a1_uhc_table_min && c < ucs_a1_uhc_table_max) {
s = ucs_a1_uhc_table[c - ucs_a1_uhc_table_min];
} else if (c >= ucs_a2_uhc_table_min && c < ucs_a2_uhc_table_max) {
s = ucs_a2_uhc_table[c - ucs_a2_uhc_table_min];
} else if (c >= ucs_a3_uhc_table_min && c < ucs_a3_uhc_table_max) {
s = ucs_a3_uhc_table[c - ucs_a3_uhc_table_min];
} else if (c >= ucs_i_uhc_table_min && c < ucs_i_uhc_table_max) {
s = ucs_i_uhc_table[c - ucs_i_uhc_table_min];
} else if (c >= ucs_s_uhc_table_min && c < ucs_s_uhc_table_max) {
s = ucs_s_uhc_table[c - ucs_s_uhc_table_min];
} else if (c >= ucs_r1_uhc_table_min && c < ucs_r1_uhc_table_max) {
s = ucs_r1_uhc_table[c - ucs_r1_uhc_table_min];
} else if (c >= ucs_r2_uhc_table_min && c < ucs_r2_uhc_table_max) {
s = ucs_r2_uhc_table[c - ucs_r2_uhc_table_min];
}
c1 = (s >> 8) & 0xff;
c2 = s & 0xff;
/* exclude UHC extension area */
if (c1 < 0xa1 || c2 < 0xa1){
s = c;
}
if (s & 0x8000) {
s -= 0x8080;
}
if (s <= 0) {
c1 = c & ~MBFL_WCSPLANE_MASK;
if (c1 == MBFL_WCSPLANE_KSC5601) {
s = c & MBFL_WCSPLANE_MASK;
}
if (c == 0) {
s = 0;
} else if (s <= 0) {
s = -1;
}
} else if ((s >= 0x80 && s < 0x2121) || (s > 0x8080)) {
s = -1;
}
if (s >= 0) {
if (s < 0x80 && s > 0) { /* ASCII */
if ((filter->status & 0x10) != 0) {
CK((*filter->output_function)(0x0f, filter->data)); /* SI */
filter->status &= ~0x10;
}
CK((*filter->output_function)(s, filter->data));
} else {
if ( (filter->status & 0x100) == 0) {
CK((*filter->output_function)(0x1b, filter->data)); /* ESC */
CK((*filter->output_function)(0x24, filter->data)); /* '$' */
CK((*filter->output_function)(0x29, filter->data)); /* ')' */
CK((*filter->output_function)(0x43, filter->data)); /* 'C' */
filter->status |= 0x100;
}
if ((filter->status & 0x10) == 0) {
CK((*filter->output_function)(0x0e, filter->data)); /* SO */
filter->status |= 0x10;
}
CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
CK((*filter->output_function)(s & 0xff, filter->data));
}
} else {
if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
CK(mbfl_filt_conv_illegal_output(c, filter));
}
}
return c;
}
int
mbfl_filt_conv_any_2022kr_flush(mbfl_convert_filter *filter)
{
/* back to ascii */
if ((filter->status & 0xff00) != 0) {
CK((*filter->output_function)(0x0f, filter->data)); /* SI */
}
filter->status &= 0xff;
return 0;
}
static int mbfl_filt_ident_2022kr(int c, mbfl_identify_filter *filter)
{
retry:
switch (filter->status & 0xf) {
/* case 0x00: ASCII */
/* case 0x10: KSC5601 mode */
/* case 0x20: KSC5601 DBCS */
/* case 0x40: KSC5601 SBCS */
case 0:
if (!(filter->status & 0x10)) {
if (c == 0x1b)
filter->status += 2;
} else if (filter->status == 0x20 && c > 0x20 && c < 0x7f) { /* kanji first char */
filter->status += 1;
} else if (c >= 0 && c < 0x80) { /* latin, CTLs */
;
} else {
filter->flag = 1; /* bad */
}
break;
/* case 0x21: KSC5601 second char */
case 1:
filter->status &= ~0xf;
if (c < 0x21 || c > 0x7e) { /* bad */
filter->flag = 1;
}
break;
/* ESC */
case 2:
if (c == 0x24) { /* '$' */
filter->status++;
} else {
filter->flag = 1; /* bad */
filter->status &= ~0xf;
goto retry;
}
break;
/* ESC $ */
case 3:
if (c == 0x29) { /* ')' */
filter->status++;
} else {
filter->flag = 1; /* bad */
filter->status &= ~0xf;
goto retry;
}
break;
/* ESC $) */
case 5:
if (c == 0x43) { /* 'C' */
filter->status = 0x10;
} else {
filter->flag = 1; /* bad */
filter->status &= ~0xf;
goto retry;
}
break;
default:
filter->status = 0;
break;
}
return c;
}