root/ext/mbstring/libmbfl/filters/mbfilter_ucs2.c

DEFINITIONS

1. mbfl_filt_conv_ucs2_wchar
2. mbfl_filt_conv_ucs2be_wchar
3. mbfl_filt_conv_wchar_ucs2be
4. mbfl_filt_conv_ucs2le_wchar
5. mbfl_filt_conv_wchar_ucs2le

   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.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_ucs2.h"
  36 
  37 static const char *mbfl_encoding_ucs2_aliases[] = {"ISO-10646-UCS-2", "UCS2" , "UNICODE", NULL};
  38 
  39 const mbfl_encoding mbfl_encoding_ucs2 = {
  40         mbfl_no_encoding_ucs2,
  41         "UCS-2",
  42         "UCS-2",
  43         (const char *(*)[])&mbfl_encoding_ucs2_aliases,
  44         NULL,
  45         MBFL_ENCTYPE_WCS2BE
  46 };
  47 
  48 const mbfl_encoding mbfl_encoding_ucs2be = {
  49         mbfl_no_encoding_ucs2be,
  50         "UCS-2BE",
  51         "UCS-2BE",
  52         NULL,
  53         NULL,
  54         MBFL_ENCTYPE_WCS2BE
  55 };
  56 
  57 const mbfl_encoding mbfl_encoding_ucs2le = {
  58         mbfl_no_encoding_ucs2le,
  59         "UCS-2LE",
  60         "UCS-2LE",
  61         NULL,
  62         NULL,
  63         MBFL_ENCTYPE_WCS2LE
  64 };
  65 
  66 const struct mbfl_convert_vtbl vtbl_ucs2_wchar = {
  67         mbfl_no_encoding_ucs2,
  68         mbfl_no_encoding_wchar,
  69         mbfl_filt_conv_common_ctor,
  70         mbfl_filt_conv_common_dtor,
  71         mbfl_filt_conv_ucs2_wchar,
  72         mbfl_filt_conv_common_flush
  73 };
  74 
  75 const struct mbfl_convert_vtbl vtbl_wchar_ucs2 = {
  76         mbfl_no_encoding_wchar,
  77         mbfl_no_encoding_ucs2,
  78         mbfl_filt_conv_common_ctor,
  79         mbfl_filt_conv_common_dtor,
  80         mbfl_filt_conv_wchar_ucs2be,
  81         mbfl_filt_conv_common_flush
  82 };
  83 
  84 const struct mbfl_convert_vtbl vtbl_ucs2be_wchar = {
  85         mbfl_no_encoding_ucs2be,
  86         mbfl_no_encoding_wchar,
  87         mbfl_filt_conv_common_ctor,
  88         mbfl_filt_conv_common_dtor,
  89         mbfl_filt_conv_ucs2be_wchar,
  90         mbfl_filt_conv_common_flush
  91 };
  92 
  93 const struct mbfl_convert_vtbl vtbl_wchar_ucs2be = {
  94         mbfl_no_encoding_wchar,
  95         mbfl_no_encoding_ucs2be,
  96         mbfl_filt_conv_common_ctor,
  97         mbfl_filt_conv_common_dtor,
  98         mbfl_filt_conv_wchar_ucs2be,
  99         mbfl_filt_conv_common_flush
 100 };
 101 
 102 const struct mbfl_convert_vtbl vtbl_ucs2le_wchar = {
 103         mbfl_no_encoding_ucs2le,
 104         mbfl_no_encoding_wchar,
 105         mbfl_filt_conv_common_ctor,
 106         mbfl_filt_conv_common_dtor,
 107         mbfl_filt_conv_ucs2le_wchar,
 108         mbfl_filt_conv_common_flush
 109 };
 110 
 111 const struct mbfl_convert_vtbl vtbl_wchar_ucs2le = {
 112         mbfl_no_encoding_wchar,
 113         mbfl_no_encoding_ucs2le,
 114         mbfl_filt_conv_common_ctor,
 115         mbfl_filt_conv_common_dtor,
 116         mbfl_filt_conv_wchar_ucs2le,
 117         mbfl_filt_conv_common_flush
 118 };
 119 
 120 #define CK(statement)   do { if ((statement) < 0) return (-1); } while (0)
 121 
 122 /*
 123  * UCS-2 => wchar
 124  */
 125 int mbfl_filt_conv_ucs2_wchar(int c, mbfl_convert_filter *filter)
 126 {
 127         int n, endian;
 128 
 129         endian = filter->status & 0xff00;
 130         switch (filter->status & 0xff) {
 131         case 0:
 132                 if (endian) {
 133                         n = c & 0xff;
 134                 } else {
 135                         n = (c & 0xff) << 8;
 136                 }
 137                 filter->cache = n;
 138                 filter->status++;
 139                 break;
 140         default:
 141                 if (endian) {
 142                         n = (c & 0xff) << 8;
 143                 } else {
 144                         n = c & 0xff;
 145                 }
 146                 n |= filter->cache;
 147                 if (n == 0xfffe) {
 148                         if (endian) {
 149                                 filter->status = 0;             /* big-endian */
 150                         } else {
 151                                 filter->status = 0x100;         /* little-endian */
 152                         }
 153                         CK((*filter->output_function)(0xfeff, filter->data));
 154                 } else {
 155                         filter->status &= ~0xff;
 156                         CK((*filter->output_function)(n, filter->data));
 157                 }
 158                 break;
 159         }
 160 
 161         return c;
 162 }
 163 
 164 /*
 165  * UCS-2BE => wchar
 166  */
 167 int mbfl_filt_conv_ucs2be_wchar(int c, mbfl_convert_filter *filter)
 168 {
 169         int n;
 170 
 171         if (filter->status == 0) {
 172                 filter->status = 1;
 173                 n = (c & 0xff) << 8;
 174                 filter->cache = n;
 175         } else {
 176                 filter->status = 0;
 177                 n = (c & 0xff) | filter->cache;
 178                 CK((*filter->output_function)(n, filter->data));
 179         }
 180         return c;
 181 }
 182 
 183 /*
 184  * wchar => UCS-2BE
 185  */
 186 int mbfl_filt_conv_wchar_ucs2be(int c, mbfl_convert_filter *filter)
 187 {
 188         if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
 189                 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
 190                 CK((*filter->output_function)(c & 0xff, filter->data));
 191         } else {
 192                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 193                         CK(mbfl_filt_conv_illegal_output(c, filter));
 194                 }
 195         }
 196 
 197         return c;
 198 }
 199 
 200 /*
 201  * UCS-2LE => wchar
 202  */
 203 int mbfl_filt_conv_ucs2le_wchar(int c, mbfl_convert_filter *filter)
 204 {
 205         int n;
 206 
 207         if (filter->status == 0) {
 208                 filter->status = 1;
 209                 n = c & 0xff;
 210                 filter->cache = n;
 211         } else {
 212                 filter->status = 0;
 213                 n = ((c & 0xff) << 8) | filter->cache;
 214                 CK((*filter->output_function)(n, filter->data));
 215         }
 216         return c;
 217 }
 218 
 219 
 220 /*
 221  * wchar => UCS-2LE
 222  */
 223 int mbfl_filt_conv_wchar_ucs2le(int c, mbfl_convert_filter *filter)
 224 {
 225         if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
 226                 CK((*filter->output_function)(c & 0xff, filter->data));
 227                 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
 228         } else {
 229                 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
 230                         CK(mbfl_filt_conv_illegal_output(c, filter));
 231                 }
 232         }
 233 
 234         return c;
 235 }
 236 
 237 
 238