root/ext/mbstring/libmbfl/filters/mbfilter_cp1251.c

DEFINITIONS

1. mbfl_filt_conv_cp1251_wchar
2. mbfl_filt_conv_wchar_cp1251
3. mbfl_filt_ident_cp1251

   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 part: Den V. Tsopa <tdv@edisoft.ru>
  22  *
  23  */
  24 /*
  25  * The source code included in this files was separated from mbfilter_ru.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_cp1251.h"
  36 #include "unicode_table_cp1251.h"
  37 
  38 static int mbfl_filt_ident_cp1251(int c, mbfl_identify_filter *filter);
  39 
  40 static const char *mbfl_encoding_cp1251_aliases[] = {"CP1251", "CP-1251", "WINDOWS-1251", NULL};
  41 
  42 const mbfl_encoding mbfl_encoding_cp1251 = {
  43         mbfl_no_encoding_cp1251,
  44         "Windows-1251",
  45         "Windows-1251",
  46         (const char *(*)[])&mbfl_encoding_cp1251_aliases,
  47         NULL,
  48         MBFL_ENCTYPE_SBCS
  49 };
  50 
  51 const struct mbfl_identify_vtbl vtbl_identify_cp1251 = {
  52         mbfl_no_encoding_cp1251,
  53         mbfl_filt_ident_common_ctor,
  54         mbfl_filt_ident_common_dtor,
  55         mbfl_filt_ident_cp1251
  56 };
  57 
  58 const struct mbfl_convert_vtbl vtbl_wchar_cp1251 = {
  59         mbfl_no_encoding_wchar,
  60         mbfl_no_encoding_cp1251,
  61         mbfl_filt_conv_common_ctor,
  62         mbfl_filt_conv_common_dtor,
  63         mbfl_filt_conv_wchar_cp1251,
  64         mbfl_filt_conv_common_flush
  65 };
  66 
  67 const struct mbfl_convert_vtbl vtbl_cp1251_wchar = {
  68         mbfl_no_encoding_cp1251,
  69         mbfl_no_encoding_wchar,
  70         mbfl_filt_conv_common_ctor,
  71         mbfl_filt_conv_common_dtor,
  72         mbfl_filt_conv_cp1251_wchar,
  73         mbfl_filt_conv_common_flush
  74 };
  75 
  76 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
  77 
  78 /*
  79  * cp1251 => wchar
  80  */
  81 int
  82 mbfl_filt_conv_cp1251_wchar(int c, mbfl_convert_filter *filter)
  83 {
  84         int s;
  85 
  86         if (c >= 0 && c < cp1251_ucs_table_min) {
  87                 s = c;
  88         } else if (c >= cp1251_ucs_table_min && c < 0x100) {
  89                 s = cp1251_ucs_table[c - cp1251_ucs_table_min];
  90                 if (s <= 0) {
  91                         s = c;
  92                         s &= MBFL_WCSPLANE_MASK;
  93                         s |= MBFL_WCSPLANE_CP1251;
  94                 }
  95         } else {
  96                 s = c;
  97                 s &= MBFL_WCSGROUP_MASK;
  98                 s |= MBFL_WCSGROUP_THROUGH;
  99         }
 100 
 101         CK((*filter->output_function)(s, filter->data));
 102 
 103         return c;
 104 }
 105 
 106 /*
 107  * wchar => cp1251
 108  */
 109 int
 110 mbfl_filt_conv_wchar_cp1251(int c, mbfl_convert_filter *filter)
 111 {
 112         int s, n;
 113 
 114         if (c < 0x80) {
 115                 s = c;
 116         } else {
 117                 s = -1;
 118                 n = cp1251_ucs_table_len-1;
 119                 while (n >= 0) {
 120                         if (c == cp1251_ucs_table[n]) {
 121                                 s = cp1251_ucs_table_min + n;
 122                                 break;
 123                         }
 124                         n--;
 125                 }
 126                 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_CP1251) {
 127                         s = c & MBFL_WCSPLANE_MASK;
 128                 }
 129         }
 130 
 131         if (s >= 0) {
 132                 CK((*filter->output_function)(s, filter->data));
 133         } else {
 134                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 135                         CK(mbfl_filt_conv_illegal_output(c, filter));
 136                 }
 137         }
 138 
 139         return c;
 140 }
 141 
 142 /* all of this is so ugly now! */
 143 static int mbfl_filt_ident_cp1251(int c, mbfl_identify_filter *filter)
 144 {
 145         if (c >= 0x80 && c < 0xff)
 146                 filter->flag = 0;
 147         else
 148                 filter->flag = 1; /* not it */
 149         return c;
 150 }
 151 
 152