release/src/router/libiconv/lib/euc_jisx0213.h

   1 /*
   2  * Copyright (C) 1999-2002 Free Software Foundation, Inc.
   3  * This file is part of the GNU LIBICONV Library.
   4  *
   5  * The GNU LIBICONV Library is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * The GNU LIBICONV Library is distributed in the hope that it will be
  11  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
  18  * Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 /*
  22  * EUC-JISX0213
  23  */
  24
  25 /* The structure of EUC-JISX0213 is as follows:
  26
  27    0x00..0x7F: ASCII
  28
  29    0x8E{A1..FE}: JISX0201 Katakana, with prefix 0x8E, offset by +0x80.
  30
  31    0x8F{A1..FE}{A1..FE}: JISX0213 plane 2, with prefix 0x8F, offset by +0x8080.
  32
  33    0x{A1..FE}{A1..FE}: JISX0213 plane 1, offset by +0x8080.
  34
  35    Note that some JISX0213 characters are not contained in Unicode 3.2
  36    and are therefore best represented as sequences of Unicode characters.
  37 */
  38
  39 #include "jisx0213.h"
  40 #include "flushwc.h"
  41
  42 static int
  43 euc_jisx0213_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  44 {
  45   ucs4_t last_wc = conv->istate;
  46   if (last_wc) {
  47     /* Output the buffered character. */
  48     conv->istate = 0;
  49     *pwc = last_wc;
  50     return 0; /* Don't advance the input pointer. */
  51   } else {
  52     unsigned char c = *s;
  53     if (c < 0x80) {
  54       /* Plain ASCII character. */
  55       *pwc = (ucs4_t) c;
  56       return 1;
  57     } else {
  58       if ((c >= 0xa1 && c <= 0xfe) || c == 0x8e || c == 0x8f) {
  59         /* Two or three byte character. */
  60         if (n >= 2) {
  61           unsigned char c2 = s[1];
  62           if (c2 >= 0xa1 && c2 <= 0xfe) {
  63             if (c == 0x8e) {
  64               /* Half-width katakana. */
  65               if (c2 <= 0xdf) {
  66                 *pwc = c2 + 0xfec0;
  67                 return 2;
  68               }
  69             } else {
  70               ucs4_t wc;
  71               if (c == 0x8f) {
  72                 /* JISX 0213 plane 2. */
  73                 if (n >= 3) {
  74                   unsigned char c3 = s[2];
  75                   wc = jisx0213_to_ucs4(0x200-0x80+c2,c3^0x80);
  76                 } else
  77                   return RET_TOOFEW(0);
  78               } else {
  79                 /* JISX 0213 plane 1. */
  80                 wc = jisx0213_to_ucs4(0x100-0x80+c,c2^0x80);
  81               }
  82               if (wc) {
  83                 if (wc < 0x80) {
  84                   /* It's a combining character. */
  85                   ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
  86                   ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
  87                   /* We cannot output two Unicode characters at once. So,
  88                      output the first character and buffer the second one. */
  89                   *pwc = wc1;
  90                   conv->istate = wc2;
  91                 } else
  92                   *pwc = wc;
  93                 return (c == 0x8f ? 3 : 2);
  94               }
  95             }
  96           }
  97         } else
  98           return RET_TOOFEW(0);
  99       }
 100       return RET_ILSEQ;
 101     }
 102   }
 103 }
 104
 105 #define euc_jisx0213_flushwc normal_flushwc
 106
 107 /* Composition tables for each of the relevant combining characters.  */
 108 static const struct { unsigned short base; unsigned short composed; } euc_jisx0213_comp_table_data[] = {
 109 #define euc_jisx0213_comp_table02e5_idx 0
 110 #define euc_jisx0213_comp_table02e5_len 1
 111   { 0xabe4, 0xabe5 }, /* 0x12B65 = 0x12B64 U+02E5 */
 112 #define euc_jisx0213_comp_table02e9_idx (euc_jisx0213_comp_table02e5_idx+euc_jisx0213_comp_table02e5_len)
 113 #define euc_jisx0213_comp_table02e9_len 1
 114   { 0xabe0, 0xabe6 }, /* 0x12B66 = 0x12B60 U+02E9 */
 115 #define euc_jisx0213_comp_table0300_idx (euc_jisx0213_comp_table02e9_idx+euc_jisx0213_comp_table02e9_len)
 116 #define euc_jisx0213_comp_table0300_len 5
 117   { 0xa9dc, 0xabc4 }, /* 0x12B44 = 0x1295C U+0300 */
 118   { 0xabb8, 0xabc8 }, /* 0x12B48 = 0x12B38 U+0300 */
 119   { 0xabb7, 0xabca }, /* 0x12B4A = 0x12B37 U+0300 */
 120   { 0xabb0, 0xabcc }, /* 0x12B4C = 0x12B30 U+0300 */
 121   { 0xabc3, 0xabce }, /* 0x12B4E = 0x12B43 U+0300 */
 122 #define euc_jisx0213_comp_table0301_idx (euc_jisx0213_comp_table0300_idx+euc_jisx0213_comp_table0300_len)
 123 #define euc_jisx0213_comp_table0301_len 4
 124   { 0xabb8, 0xabc9 }, /* 0x12B49 = 0x12B38 U+0301 */
 125   { 0xabb7, 0xabcb }, /* 0x12B4B = 0x12B37 U+0301 */
 126   { 0xabb0, 0xabcd }, /* 0x12B4D = 0x12B30 U+0301 */
 127   { 0xabc3, 0xabcf }, /* 0x12B4F = 0x12B43 U+0301 */
 128 #define euc_jisx0213_comp_table309a_idx (euc_jisx0213_comp_table0301_idx+euc_jisx0213_comp_table0301_len)
 129 #define euc_jisx0213_comp_table309a_len 14
 130   { 0xa4ab, 0xa4f7 }, /* 0x12477 = 0x1242B U+309A */
 131   { 0xa4ad, 0xa4f8 }, /* 0x12478 = 0x1242D U+309A */
 132   { 0xa4af, 0xa4f9 }, /* 0x12479 = 0x1242F U+309A */
 133   { 0xa4b1, 0xa4fa }, /* 0x1247A = 0x12431 U+309A */
 134   { 0xa4b3, 0xa4fb }, /* 0x1247B = 0x12433 U+309A */
 135   { 0xa5ab, 0xa5f7 }, /* 0x12577 = 0x1252B U+309A */
 136   { 0xa5ad, 0xa5f8 }, /* 0x12578 = 0x1252D U+309A */
 137   { 0xa5af, 0xa5f9 }, /* 0x12579 = 0x1252F U+309A */
 138   { 0xa5b1, 0xa5fa }, /* 0x1257A = 0x12531 U+309A */
 139   { 0xa5b3, 0xa5fb }, /* 0x1257B = 0x12533 U+309A */
 140   { 0xa5bb, 0xa5fc }, /* 0x1257C = 0x1253B U+309A */
 141   { 0xa5c4, 0xa5fd }, /* 0x1257D = 0x12544 U+309A */
 142   { 0xa5c8, 0xa5fe }, /* 0x1257E = 0x12548 U+309A */
 143   { 0xa6f5, 0xa6f8 }, /* 0x12678 = 0x12675 U+309A */
 144 };
 145
 146 static int
 147 euc_jisx0213_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 148 {
 149   int count = 0;
 150   unsigned short lasttwo = conv->ostate;
 151
 152   if (lasttwo) {
 153     /* Attempt to combine the last character with this one. */
 154     unsigned int idx;
 155     unsigned int len;
 156
 157     if (wc == 0x02e5)
 158       idx = euc_jisx0213_comp_table02e5_idx,
 159       len = euc_jisx0213_comp_table02e5_len;
 160     else if (wc == 0x02e9)
 161       idx = euc_jisx0213_comp_table02e9_idx,
 162       len = euc_jisx0213_comp_table02e9_len;
 163     else if (wc == 0x0300)
 164       idx = euc_jisx0213_comp_table0300_idx,
 165       len = euc_jisx0213_comp_table0300_len;
 166     else if (wc == 0x0301)
 167       idx = euc_jisx0213_comp_table0301_idx,
 168       len = euc_jisx0213_comp_table0301_len;
 169     else if (wc == 0x309a)
 170       idx = euc_jisx0213_comp_table309a_idx,
 171       len = euc_jisx0213_comp_table309a_len;
 172     else
 173       goto not_combining;
 174
 175     do
 176       if (euc_jisx0213_comp_table_data[idx].base == lasttwo)
 177         break;
 178     while (++idx, --len > 0);
 179
 180     if (len > 0) {
 181       /* Output the combined character. */
 182       if (n >= 2) {
 183         lasttwo = euc_jisx0213_comp_table_data[idx].composed;
 184         r[0] = (lasttwo >> 8) & 0xff;
 185         r[1] = lasttwo & 0xff;
 186         conv->ostate = 0;
 187         return 2;
 188       } else
 189         return RET_TOOSMALL;
 190     }
 191
 192   not_combining:
 193     /* Output the buffered character. */
 194     if (n < 2)
 195       return RET_TOOSMALL;
 196     r[0] = (lasttwo >> 8) & 0xff;
 197     r[1] = lasttwo & 0xff;
 198     r += 2;
 199     count = 2;
 200   }
 201
 202   if (wc < 0x80) {
 203     /* Plain ASCII character. */
 204     if (n > count) {
 205       r[0] = (unsigned char) wc;
 206       conv->ostate = 0;
 207       return count+1;
 208     } else
 209       return RET_TOOSMALL;
 210   } else if (wc >= 0xff61 && wc <= 0xff9f) {
 211     /* Half-width katakana. */
 212     if (n >= count+2) {
 213       r[0] = 0x8e;
 214       r[1] = wc - 0xfec0;
 215       conv->ostate = 0;
 216       return count+2;
 217     } else
 218       return RET_TOOSMALL;
 219   } else {
 220     unsigned short jch = ucs4_to_jisx0213(wc);
 221     if (jch != 0) {
 222       if (jch & 0x0080) {
 223         /* A possible match in comp_table_data. We have to buffer it. */
 224         /* We know it's a JISX 0213 plane 1 character. */
 225         if (jch & 0x8000) abort();
 226         conv->ostate = jch | 0x8080;
 227         return count+0;
 228       }
 229       if (jch & 0x8000) {
 230         /* JISX 0213 plane 2. */
 231         if (n >= count+3) {
 232           r[0] = 0x8f;
 233           r[1] = (jch >> 8) | 0x80;
 234           r[2] = (jch & 0xff) | 0x80;
 235           conv->ostate = 0;
 236           return count+3;
 237         } else
 238           return RET_TOOSMALL;
 239       } else {
 240         /* JISX 0213 plane 1. */
 241         if (n >= count+2) {
 242           r[0] = (jch >> 8) | 0x80;
 243           r[1] = (jch & 0xff) | 0x80;
 244           conv->ostate = 0;
 245           return count+2;
 246         } else
 247           return RET_TOOSMALL;
 248       }
 249     }
 250     return RET_ILUNI;
 251   }
 252 }
 253
 254 static int
 255 euc_jisx0213_reset (conv_t conv, unsigned char *r, int n)
 256 {
 257   state_t lasttwo = conv->ostate;
 258
 259   if (lasttwo) {
 260     if (n < 2)
 261       return RET_TOOSMALL;
 262     r[0] = (lasttwo >> 8) & 0xff;
 263     r[1] = lasttwo & 0xff;
 264     /* conv->ostate = 0; will be done by the caller */
 265     return 2;
 266   } else
 267     return 0;
 268 }