root/ext/mbstring/libmbfl/filters/mbfilter_koi8u.c

DEFINITIONS

1. mbfl_filt_conv_koi8u_wchar
2. mbfl_filt_conv_wchar_koi8u
3. mbfl_filt_ident_koi8u

   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: Maksym Veremeyenko <verem@m1.tv>
  22  *
  23  * Based on mbfilter_koi8r.c code
  24  *
  25  */
  26 
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30 
  31 #include "mbfilter.h"
  32 #include "mbfilter_koi8u.h"
  33 #include "unicode_table_koi8u.h"
  34 
  35 static int mbfl_filt_ident_koi8u(int c, mbfl_identify_filter *filter);
  36 
  37 static const char *mbfl_encoding_koi8u_aliases[] = {"KOI8-U", "KOI8U", NULL};
  38 
  39 const mbfl_encoding mbfl_encoding_koi8u = {
  40         mbfl_no_encoding_koi8u,
  41         "KOI8-U",
  42         "KOI8-U",
  43         (const char *(*)[])&mbfl_encoding_koi8u_aliases,
  44         NULL,
  45         MBFL_ENCTYPE_SBCS
  46 };
  47 
  48 const struct mbfl_identify_vtbl vtbl_identify_koi8u = {
  49         mbfl_no_encoding_koi8u,
  50         mbfl_filt_ident_common_ctor,
  51         mbfl_filt_ident_common_dtor,
  52         mbfl_filt_ident_koi8u
  53 };
  54 
  55 const struct mbfl_convert_vtbl vtbl_wchar_koi8u = {
  56         mbfl_no_encoding_wchar,
  57         mbfl_no_encoding_koi8u,
  58         mbfl_filt_conv_common_ctor,
  59         mbfl_filt_conv_common_dtor,
  60         mbfl_filt_conv_wchar_koi8u,
  61         mbfl_filt_conv_common_flush
  62 };
  63 
  64 const struct mbfl_convert_vtbl vtbl_koi8u_wchar = {
  65         mbfl_no_encoding_koi8u,
  66         mbfl_no_encoding_wchar,
  67         mbfl_filt_conv_common_ctor,
  68         mbfl_filt_conv_common_dtor,
  69         mbfl_filt_conv_koi8u_wchar,
  70         mbfl_filt_conv_common_flush
  71 };
  72 
  73 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
  74 
  75 /*
  76  * koi8u => wchar
  77  */
  78 int
  79 mbfl_filt_conv_koi8u_wchar(int c, mbfl_convert_filter *filter)
  80 {
  81         int s;
  82 
  83         if (c >= 0 && c < koi8u_ucs_table_min) {
  84                 s = c;
  85         } else if (c >= koi8u_ucs_table_min && c < 0x100) {
  86                 s = koi8u_ucs_table[c - koi8u_ucs_table_min];
  87                 if (s <= 0) {
  88                         s = c;
  89                         s &= MBFL_WCSPLANE_MASK;
  90                         s |= MBFL_WCSPLANE_KOI8U;
  91                 }
  92         } else {
  93                 s = c;
  94                 s &= MBFL_WCSGROUP_MASK;
  95                 s |= MBFL_WCSGROUP_THROUGH;
  96         }
  97 
  98         CK((*filter->output_function)(s, filter->data));
  99 
 100         return c;
 101 }
 102 
 103 /*
 104  * wchar => koi8u
 105  */
 106 int
 107 mbfl_filt_conv_wchar_koi8u(int c, mbfl_convert_filter *filter)
 108 {
 109         int s, n;
 110 
 111         if (c < 0x80) {
 112                 s = c;
 113         } else {
 114                 s = -1;
 115                 n = koi8u_ucs_table_len-1;
 116                 while (n >= 0) {
 117                         if (c == koi8u_ucs_table[n]) {
 118                                 s = koi8u_ucs_table_min + n;
 119                                 break;
 120                         }
 121                         n--;
 122                 }
 123                 if (s <= 0 && (c & ~MBFL_WCSPLANE_MASK) == MBFL_WCSPLANE_KOI8U) {
 124                         s = c & MBFL_WCSPLANE_MASK;
 125                 }
 126         }
 127 
 128         if (s >= 0) {
 129                 CK((*filter->output_function)(s, filter->data));
 130         } else {
 131                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 132                         CK(mbfl_filt_conv_illegal_output(c, filter));
 133                 }
 134         }
 135 
 136         return c;
 137 }
 138 
 139 static int mbfl_filt_ident_koi8u(int c, mbfl_identify_filter *filter)
 140 {
 141         if (c >= 0x80 && c < 0xff)
 142                 filter->flag = 0;
 143         else
 144                 filter->flag = 1; /* not it */
 145         return c;
 146 }