ext/mbstring/libmbfl/filters/mbfilter_euc

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This source file includes following definitions.
mbfl_filt_conv_euccn_wchar
mbfl_filt_conv_wchar_euccn
mbfl_filt_ident_euccn
   1 /*
   2  * "streamable kanji code filter and converter"
   3  * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
   4  *
   5  * LICENSE NOTICES
   6  *
   7  * This file is part of "streamable kanji code filter and converter",
   8  * which is distributed under the terms of GNU Lesser General Public
   9  * License (version 2) as published by the Free Software Foundation.
  10  *
  11  * This software is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with "streamable kanji code filter and converter";
  18  * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  19  * Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * The author of this file:
  22  *
  23  */
  24 /*
  25  * The source code included in this files was separated from mbfilter_cn.c
  26  * by Moriyoshi Koizumi <moriyoshi@php.net> on 4 Dec 2002.
  27  *
  28  */
  29 
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33 
  34 #include "mbfilter.h"
  35 #include "mbfilter_euc_cn.h"
  36 
  37 #include "unicode_table_cp936.h"
  38 
  39 static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter);
  40 
  41 static const unsigned char mblen_table_euccn[] = { /* 0xA1-0xFE */
  42   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  43   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  44   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  45   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  46   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  47   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  48   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  49   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  50   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  51   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  52   1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  53   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  54   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  55   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  56   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  57   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
  58 };
  59 
  60 static const char *mbfl_encoding_euc_cn_aliases[] = {"CN-GB", "EUC_CN", "eucCN", "x-euc-cn", "gb2312", NULL};
  61 
  62 const mbfl_encoding mbfl_encoding_euc_cn = {
  63         mbfl_no_encoding_euc_cn,
  64         "EUC-CN",
  65         "CN-GB",
  66         (const char *(*)[])&mbfl_encoding_euc_cn_aliases,
  67         mblen_table_euccn,
  68         MBFL_ENCTYPE_MBCS
  69 };
  70 
  71 const struct mbfl_identify_vtbl vtbl_identify_euccn = {
  72         mbfl_no_encoding_euc_cn,
  73         mbfl_filt_ident_common_ctor,
  74         mbfl_filt_ident_common_dtor,
  75         mbfl_filt_ident_euccn
  76 };
  77 
  78 const struct mbfl_convert_vtbl vtbl_euccn_wchar = {
  79         mbfl_no_encoding_euc_cn,
  80         mbfl_no_encoding_wchar,
  81         mbfl_filt_conv_common_ctor,
  82         mbfl_filt_conv_common_dtor,
  83         mbfl_filt_conv_euccn_wchar,
  84         mbfl_filt_conv_common_flush
  85 };
  86 
  87 const struct mbfl_convert_vtbl vtbl_wchar_euccn = {
  88         mbfl_no_encoding_wchar,
  89         mbfl_no_encoding_euc_cn,
  90         mbfl_filt_conv_common_ctor,
  91         mbfl_filt_conv_common_dtor,
  92         mbfl_filt_conv_wchar_euccn,
  93         mbfl_filt_conv_common_flush
  94 };
  95 
  96 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
  97 
  98 /*
  99  * EUC-CN => wchar
 100  */
 101 int
 102 mbfl_filt_conv_euccn_wchar(int c, mbfl_convert_filter *filter)
 103 {
 104         int c1, w;
 105 
 106         switch (filter->status) {
 107         case 0:
 108                 if (c >= 0 && c < 0x80) {       /* latin */
 109                         CK((*filter->output_function)(c, filter->data));
 110                 } else if (c > 0xa0 && c < 0xff) {      /* dbcs lead byte */
 111                         filter->status = 1;
 112                         filter->cache = c;
 113                 } else {
 114                         w = c & MBFL_WCSGROUP_MASK;
 115                         w |= MBFL_WCSGROUP_THROUGH;
 116                         CK((*filter->output_function)(w, filter->data));
 117                 }
 118                 break;
 119 
 120         case 1:         /* dbcs second byte */
 121                 filter->status = 0;
 122                 c1 = filter->cache;
 123                 if (c1 > 0xa0 && c1 < 0xff && c > 0xa0 && c < 0xff) {
 124                         w = (c1 - 0x81)*192 + (c - 0x40);
 125                         if (w >= 0 && w < cp936_ucs_table_size) {
 126                                 w = cp936_ucs_table[w];
 127                         } else {
 128                                 w = 0;
 129                         }
 130                         if (w <= 0) {
 131                                 w = (c1 << 8) | c;
 132                                 w &= MBFL_WCSPLANE_MASK;
 133                                 w |= MBFL_WCSPLANE_GB2312;
 134                         }
 135                         CK((*filter->output_function)(w, filter->data));
 136                 } else if ((c >= 0 && c < 0x21) || c == 0x7f) {         /* CTLs */
 137                         CK((*filter->output_function)(c, filter->data));
 138                 } else {
 139                         w = (c1 << 8) | c;
 140                         w &= MBFL_WCSGROUP_MASK;
 141                         w |= MBFL_WCSGROUP_THROUGH;
 142                         CK((*filter->output_function)(w, filter->data));
 143                 }
 144                 break;
 145 
 146         default:
 147                 filter->status = 0;
 148                 break;
 149         }
 150 
 151         return c;
 152 }
 153 
 154 /*
 155  * wchar => EUC-CN
 156  */
 157 int
 158 mbfl_filt_conv_wchar_euccn(int c, mbfl_convert_filter *filter)
 159 {
 160         int c1, c2, s;
 161 
 162         s = 0;
 163         if (c >= ucs_a1_cp936_table_min && c < ucs_a1_cp936_table_max) {
 164                 s = ucs_a1_cp936_table[c - ucs_a1_cp936_table_min];
 165         } else if (c >= ucs_a2_cp936_table_min && c < ucs_a2_cp936_table_max) {
 166                 s = ucs_a2_cp936_table[c - ucs_a2_cp936_table_min];
 167         } else if (c >= ucs_a3_cp936_table_min && c < ucs_a3_cp936_table_max) {
 168                 s = ucs_a3_cp936_table[c - ucs_a3_cp936_table_min];
 169         } else if (c >= ucs_i_cp936_table_min && c < ucs_i_cp936_table_max) {
 170                 s = ucs_i_cp936_table[c - ucs_i_cp936_table_min];
 171         } else if (c >= ucs_hff_cp936_table_min && c < ucs_hff_cp936_table_max) {
 172                 if (c == 0xff04) {
 173                         s = 0xa1e7;
 174                 } else if (c == 0xff5e) {
 175                         s = 0xa1ab;
 176                 } else if (c >= 0xff01 && c <= 0xff5d) {
 177                         s = c - 0xff01 + 0xa3a1;
 178                 } else if (c >= 0xffe0 && c <= 0xffe5) {
 179                         s = ucs_hff_s_cp936_table[c-0xffe0];
 180                 }
 181         }
 182         c1 = (s >> 8) & 0xff;
 183         c2 = s & 0xff;
 184 
 185         if (c1 < 0xa1 || c2 < 0xa1) { /* exclude CP936 extension */
 186                 s = c;
 187         }
 188 
 189         if (s <= 0) {
 190                 c1 = c & ~MBFL_WCSPLANE_MASK;
 191                 if (c1 == MBFL_WCSPLANE_GB2312) {
 192                         s = c & MBFL_WCSPLANE_MASK;
 193                 }
 194                 if (c == 0) {
 195                         s = 0;
 196                 } else if (s <= 0) {
 197                         s = -1;
 198                 }
 199         }
 200         if (s >= 0) {
 201                 if (s < 0x80) { /* latin */
 202                         CK((*filter->output_function)(s, filter->data));
 203                 } else {
 204                         CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
 205                         CK((*filter->output_function)(s & 0xff, filter->data));
 206                 }
 207         } else {
 208                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 209                         CK(mbfl_filt_conv_illegal_output(c, filter));
 210                 }
 211         }
 212 
 213         return c;
 214 }
 215 
 216 static int mbfl_filt_ident_euccn(int c, mbfl_identify_filter *filter)
 217 {
 218         switch (filter->status) {
 219         case  0:        /* latin */
 220                 if (c >= 0 && c < 0x80) {       /* ok */
 221                         ;
 222                 } else if (c > 0xa0 && c < 0xff) {      /* DBCS lead byte */
 223                         filter->status = 1;
 224                 } else {                                                        /* bad */
 225                         filter->flag = 1;
 226                 }
 227                 break;
 228 
 229         case  1:        /* got lead byte */
 230                 if (c < 0xa1 || c > 0xfe) {             /* bad */
 231                         filter->flag = 1;
 232                 }
 233                 filter->status = 0;
 234                 break;
 235 
 236         default:
 237                 filter->status = 0;
 238                 break;
 239         }
 240 
 241         return c;
 242 }
 243 
 244
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root/ext/mbstring/libmbfl/filters/mbfilter_euc_cn.c

DEFINITIONS
