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277 lines
6.6 KiB
C
277 lines
6.6 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_hz.h"
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#include "unicode_table_cp936.h"
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static int mbfl_filt_ident_hz(int c, mbfl_identify_filter *filter);
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const mbfl_encoding mbfl_encoding_hz = {
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mbfl_no_encoding_hz,
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"HZ",
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"HZ-GB-2312",
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NULL,
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NULL,
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MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
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};
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const struct mbfl_identify_vtbl vtbl_identify_hz = {
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mbfl_no_encoding_hz,
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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_hz
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};
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const struct mbfl_convert_vtbl vtbl_hz_wchar = {
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mbfl_no_encoding_hz,
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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_hz_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_hz = {
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mbfl_no_encoding_wchar,
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mbfl_no_encoding_hz,
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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_hz,
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mbfl_filt_conv_any_hz_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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* HZ => wchar
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*/
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int
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mbfl_filt_conv_hz_wchar(int c, mbfl_convert_filter *filter)
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{
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int c1, s, w;
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switch (filter->status & 0xf) {
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/* case 0x00: ASCII */
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/* case 0x10: GB2312 */
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case 0:
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if (c == 0x7e) {
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filter->status += 2;
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} else if (filter->status == 0x10 && c > 0x20 && c < 0x7f) { /* DBCS first char */
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filter->cache = c;
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filter->status += 1;
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} else if (c >= 0 && c < 0x80) { /* latin, CTLs */
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CK((*filter->output_function)(c, filter->data));
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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 0x11: GB2312 second char */
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case 1:
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filter->status &= ~0xf;
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c1 = filter->cache;
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if (c1 > 0x20 && c1 < 0x7f && c > 0x20 && c < 0x7f) {
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s = (c1 - 1)*192 + c + 0x40; /* GB2312 */
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if (s >= 0 && s < cp936_ucs_table_size) {
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w = cp936_ucs_table[s];
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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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/* '~' */
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case 2:
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if (c == 0x7d) { /* '}' */
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filter->status = 0x0;
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} else if (c == 0x7b) { /* '{' */
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filter->status = 0x10;
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} else if (c == 0x7e) { /* '~' */
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filter->status = 0x0;
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CK((*filter->output_function)(0x007e, 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 => HZ
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*/
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int
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mbfl_filt_conv_wchar_hz(int c, mbfl_convert_filter *filter)
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{
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int 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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if (s & 0x8000) {
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s -= 0x8080;
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}
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if (s <= 0) {
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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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} else if ((s >= 0x80 && s < 0x2121) || (s > 0x8080)) {
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s = -1;
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}
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if (s >= 0) {
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if (s < 0x80) { /* ASCII */
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if ((filter->status & 0xff00) != 0) {
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CK((*filter->output_function)(0x7e, filter->data)); /* '~' */
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CK((*filter->output_function)(0x7d, filter->data)); /* '}' */
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}
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filter->status = 0;
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if (s == 0x7e){
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CK((*filter->output_function)(0x7e, filter->data));
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}
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CK((*filter->output_function)(s, filter->data));
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} else { /* GB 2312-80 */
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if ((filter->status & 0xff00) != 0x200) {
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CK((*filter->output_function)(0x7e, filter->data)); /* '~' */
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CK((*filter->output_function)(0x7b, filter->data)); /* '{' */
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}
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filter->status = 0x200;
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CK((*filter->output_function)((s >> 8) & 0x7f, filter->data));
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CK((*filter->output_function)(s & 0x7f, 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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int
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mbfl_filt_conv_any_hz_flush(mbfl_convert_filter *filter)
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{
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/* back to latin */
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if ((filter->status & 0xff00) != 0) {
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CK((*filter->output_function)(0x7e, filter->data)); /* ~ */
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CK((*filter->output_function)(0x7d, filter->data)); /* '{' */
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}
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filter->status &= 0xff;
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return 0;
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}
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static int mbfl_filt_ident_hz(int c, mbfl_identify_filter *filter)
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{
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switch (filter->status & 0xf) {
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/* case 0x00: ASCII */
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/* case 0x10: GB2312 */
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case 0:
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if (c == 0x7e) {
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filter->status += 2;
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} else if (filter->status == 0x10 && c > 0x20 && c < 0x7f) { /* DBCS first char */
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filter->status += 1;
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} else if (c >= 0 && c < 0x80) { /* latin, CTLs */
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;
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} else {
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filter->flag = 1; /* bad */
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}
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break;
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/* case 0x11: GB2312 second char */
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case 1:
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filter->status &= ~0xf;
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if (c < 0x21 || c > 0x7e) { /* bad */
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filter->flag = 1;
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}
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break;
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case 2:
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if (c == 0x7d) { /* '}' */
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filter->status = 0;
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} else if (c == 0x7b) { /* '{' */
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filter->status = 0x10;
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} else if (c == 0x7e) { /* '~' */
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filter->status = 0;
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} else {
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filter->flag = 1; /* bad */
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filter->status &= ~0xf;
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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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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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*/
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