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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 part: Den V. Tsopa <tdv@edisoft.ru>
* Adaption for CP850: D. Giffeler <dg@artegic.de>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mbfilter.h"
#include "mbfilter_cp850.h"
#include "unicode_table_cp850.h"
static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter);
static const char *mbfl_encoding_cp850_aliases[] = {"CP850", "CP-850", "IBM850", "IBM-850", NULL};
const mbfl_encoding mbfl_encoding_cp850 = {
mbfl_no_encoding_cp850,
"CP850",
"CP850",
(const char *(*)[])&mbfl_encoding_cp850_aliases,
NULL,
MBFL_ENCTYPE_SBCS,
&vtbl_cp850_wchar,
&vtbl_wchar_cp850
};
const struct mbfl_identify_vtbl vtbl_identify_cp850 = {
mbfl_no_encoding_cp850,
mbfl_filt_ident_common_ctor,
mbfl_filt_ident_common_dtor,
mbfl_filt_ident_cp850
};
const struct mbfl_convert_vtbl vtbl_wchar_cp850 = {
mbfl_no_encoding_wchar,
mbfl_no_encoding_cp850,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_wchar_cp850,
mbfl_filt_conv_common_flush
};
const struct mbfl_convert_vtbl vtbl_cp850_wchar = {
mbfl_no_encoding_cp850,
mbfl_no_encoding_wchar,
mbfl_filt_conv_common_ctor,
mbfl_filt_conv_common_dtor,
mbfl_filt_conv_cp850_wchar,
mbfl_filt_conv_common_flush
};
#define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
/*
* cp850 => wchar
*/
int
mbfl_filt_conv_cp850_wchar(int c, mbfl_convert_filter *filter)
{
int s;
if (c >= 0 && c < cp850_ucs_table_min) {
s = c;
} else if (c >= cp850_ucs_table_min && c < 0x100) {
s = cp850_ucs_table[c - cp850_ucs_table_min];
if (s <= 0) {
s = c;
s &= MBFL_WCSPLANE_MASK;
s |= MBFL_WCSPLANE_CP850;
}
} else {
s = c;
s &= MBFL_WCSGROUP_MASK;
s |= MBFL_WCSGROUP_THROUGH;
}
CK((*filter->output_function)(s, filter->data));
return c;
}
/*
* wchar => cp850
*/
int
mbfl_filt_conv_wchar_cp850(int c, mbfl_convert_filter *filter)
{
int s, n;
if (c < 0x80) {
s = c;
} else {
s = -1;
n = cp850_ucs_table_len-1;
while (n >= 0) {
if (c == cp850_ucs_table[n]) {
s = cp850_ucs_table_min + n;
break;
}
n--;
}
if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_CP850) {
s = c & MBFL_WCSPLANE_MASK;
}
}
if (s >= 0) {
CK((*filter->output_function)(s, 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_cp850(int c, mbfl_identify_filter *filter)
{
if (c >= 0x80 && c < 0xff)
filter->flag = 0;
else
filter->flag = 1; /* not it */
return c;
}
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