root/ext/mbstring/libmbfl/filters/mbfilter_cp850.c

DEFINITIONS

1. mbfl_filt_conv_cp850_wchar
2. mbfl_filt_conv_wchar_cp850
3. mbfl_filt_ident_cp850

   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  * Adaption for CP850: D. Giffeler <dg@artegic.de>
  23  *
  24  */
  25 
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29 
  30 #include "mbfilter.h"
  31 #include "mbfilter_cp850.h"
  32 #include "unicode_table_cp850.h"
  33 
  34 static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter);
  35 
  36 static const char *mbfl_encoding_cp850_aliases[] = {"CP850", "CP-850", "IBM850", "IBM-850", NULL};
  37 
  38 const mbfl_encoding mbfl_encoding_cp850 = {
  39         mbfl_no_encoding_cp850,
  40         "CP850",
  41         "CP850",
  42         (const char *(*)[])&mbfl_encoding_cp850_aliases,
  43         NULL,
  44         MBFL_ENCTYPE_SBCS
  45 };
  46 
  47 const struct mbfl_identify_vtbl vtbl_identify_cp850 = {
  48         mbfl_no_encoding_cp850,
  49         mbfl_filt_ident_common_ctor,
  50         mbfl_filt_ident_common_dtor,
  51         mbfl_filt_ident_cp850
  52 };
  53 
  54 const struct mbfl_convert_vtbl vtbl_wchar_cp850 = {
  55         mbfl_no_encoding_wchar,
  56         mbfl_no_encoding_cp850,
  57         mbfl_filt_conv_common_ctor,
  58         mbfl_filt_conv_common_dtor,
  59         mbfl_filt_conv_wchar_cp850,
  60         mbfl_filt_conv_common_flush
  61 };
  62 
  63 const struct mbfl_convert_vtbl vtbl_cp850_wchar = {
  64         mbfl_no_encoding_cp850,
  65         mbfl_no_encoding_wchar,
  66         mbfl_filt_conv_common_ctor,
  67         mbfl_filt_conv_common_dtor,
  68         mbfl_filt_conv_cp850_wchar,
  69         mbfl_filt_conv_common_flush
  70 };
  71 
  72 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
  73 
  74 /*
  75  * cp850 => wchar
  76  */
  77 int
  78 mbfl_filt_conv_cp850_wchar(int c, mbfl_convert_filter *filter)
  79 {
  80         int s;
  81 
  82         if (c >= 0 && c < cp850_ucs_table_min) {
  83                 s = c;
  84         } else if (c >= cp850_ucs_table_min && c < 0x100) {
  85                 s = cp850_ucs_table[c - cp850_ucs_table_min];
  86                 if (s <= 0) {
  87                         s = c;
  88                         s &= MBFL_WCSPLANE_MASK;
  89                         s |= MBFL_WCSPLANE_CP850;
  90                 }
  91         } else {
  92                 s = c;
  93                 s &= MBFL_WCSGROUP_MASK;
  94                 s |= MBFL_WCSGROUP_THROUGH;
  95         }
  96 
  97         CK((*filter->output_function)(s, filter->data));
  98 
  99         return c;
 100 }
 101 
 102 /*
 103  * wchar => cp850
 104  */
 105 int
 106 mbfl_filt_conv_wchar_cp850(int c, mbfl_convert_filter *filter)
 107 {
 108         int s, n;
 109 
 110         if (c < 0x80) {
 111                 s = c;
 112         } else {
 113                 s = -1;
 114                 n = cp850_ucs_table_len-1;
 115                 while (n >= 0) {
 116                         if (c == cp850_ucs_table[n]) {
 117                                 s = cp850_ucs_table_min + n;
 118                                 break;
 119                         }
 120                         n--;
 121                 }
 122                 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_CP850) {
 123                         s = c & MBFL_WCSPLANE_MASK;
 124                 }
 125         }
 126 
 127         if (s >= 0) {
 128                 CK((*filter->output_function)(s, filter->data));
 129         } else {
 130                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 131                         CK(mbfl_filt_conv_illegal_output(c, filter));
 132                 }
 133         }
 134 
 135         return c;
 136 }
 137 
 138 static int mbfl_filt_ident_cp850(int c, mbfl_identify_filter *filter)
 139 {
 140         if (c >= 0x80 && c < 0xff)
 141                 filter->flag = 0;
 142         else
 143                 filter->flag = 1; /* not it */
 144         return c;
 145 }
 146 
 147