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Annotation of embedaddon/libiconv/lib/big5hkscs2001.h, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  * Copyright (C) 1999-2002, 2006, 2016 Free Software Foundation, Inc.
1.1       misho       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.
1.1.1.2 ! misho      17:  * If not, see <https://www.gnu.org/licenses/>.
1.1       misho      18:  */
                     19: 
                     20: /*
                     21:  * BIG5-HKSCS:2001
                     22:  */
                     23: 
                     24: /*
                     25:  * BIG5-HKSCS:2001 can be downloaded from
                     26:  *   http://www.info.gov.hk/digital21/eng/hkscs/download.html
                     27:  *   http://www.info.gov.hk/digital21/eng/hkscs/index.html
                     28:  *
                     29:  * It extends BIG5-HKSCS:1999 through 116 characters.
                     30:  *
                     31:  * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
                     32:  *
                     33:  *   0x{88..8D}{40..7E,A1..FE}      757 characters
                     34:  *   0x{8E..A0}{40..7E,A1..FE}     2898 characters
                     35:  *   0x{C6..C8}{40..7E,A1..FE}      359 characters
                     36:  *   0xF9{D6..FE}                    41 characters
                     37:  *   0x{FA..FE}{40..7E,A1..FE}      763 characters
                     38:  *
                     39:  * Note that some HKSCS characters are not contained in Unicode 3.2
                     40:  * and are therefore best represented as sequences of Unicode characters:
                     41:  *   0x8862  U+00CA U+0304  LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
                     42:  *   0x8864  U+00CA U+030C  LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
                     43:  *   0x88A3  U+00EA U+0304  LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
                     44:  *   0x88A5  U+00EA U+030C  LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
                     45:  */
                     46: 
                     47: #include "hkscs2001.h"
                     48: #include "flushwc.h"
                     49: 
                     50: static int
1.1.1.2 ! misho      51: big5hkscs2001_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
1.1       misho      52: {
                     53:   ucs4_t last_wc = conv->istate;
                     54:   if (last_wc) {
                     55:     /* Output the buffered character. */
                     56:     conv->istate = 0;
                     57:     *pwc = last_wc;
                     58:     return 0; /* Don't advance the input pointer. */
                     59:   } else {
                     60:     unsigned char c = *s;
                     61:     /* Code set 0 (ASCII) */
                     62:     if (c < 0x80)
                     63:       return ascii_mbtowc(conv,pwc,s,n);
                     64:     /* Code set 1 (BIG5 extended) */
                     65:     if (c >= 0xa1 && c < 0xff) {
                     66:       if (n < 2)
                     67:         return RET_TOOFEW(0);
                     68:       {
                     69:         unsigned char c2 = s[1];
                     70:         if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
                     71:           if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
                     72:             int ret = big5_mbtowc(conv,pwc,s,2);
                     73:             if (ret != RET_ILSEQ)
                     74:               return ret;
                     75:           }
                     76:         }
                     77:       }
                     78:     }
                     79:     {
                     80:       int ret = hkscs1999_mbtowc(conv,pwc,s,n);
                     81:       if (ret != RET_ILSEQ)
                     82:         return ret;
                     83:     }
                     84:     {
                     85:       int ret = hkscs2001_mbtowc(conv,pwc,s,n);
                     86:       if (ret != RET_ILSEQ)
                     87:         return ret;
                     88:     }
                     89:     if (c == 0x88) {
                     90:       if (n < 2)
                     91:         return RET_TOOFEW(0);
                     92:       {
                     93:         unsigned char c2 = s[1];
                     94:         if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
                     95:           /* It's a composed character. */
                     96:           ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
                     97:           ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
                     98:           /* We cannot output two Unicode characters at once. So,
                     99:              output the first character and buffer the second one. */
                    100:           *pwc = wc1;
                    101:           conv->istate = wc2;
                    102:           return 2;
                    103:         }
                    104:       }
                    105:     }
                    106:     return RET_ILSEQ;
                    107:   }
                    108: }
                    109: 
                    110: #define big5hkscs2001_flushwc normal_flushwc
                    111: 
                    112: static int
1.1.1.2 ! misho     113: big5hkscs2001_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
1.1       misho     114: {
                    115:   int count = 0;
                    116:   unsigned char last = conv->ostate;
                    117: 
                    118:   if (last) {
                    119:     /* last is = 0x66 or = 0xa7. */
                    120:     if (wc == 0x0304 || wc == 0x030c) {
                    121:       /* Output the combined character. */
                    122:       if (n >= 2) {
                    123:         r[0] = 0x88;
                    124:         r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
                    125:         conv->ostate = 0;
                    126:         return 2;
                    127:       } else
                    128:         return RET_TOOSMALL;
                    129:     }
                    130: 
                    131:     /* Output the buffered character. */
                    132:     if (n < 2)
                    133:       return RET_TOOSMALL;
                    134:     r[0] = 0x88;
                    135:     r[1] = last;
                    136:     r += 2;
                    137:     count = 2;
                    138:   }
                    139: 
                    140:   /* Code set 0 (ASCII) */
                    141:   if (wc < 0x0080) {
                    142:     /* Plain ASCII character. */
                    143:     if (n > count) {
                    144:       r[0] = (unsigned char) wc;
                    145:       conv->ostate = 0;
                    146:       return count+1;
                    147:     } else
                    148:       return RET_TOOSMALL;
                    149:   } else {
                    150:     unsigned char buf[2];
                    151:     int ret;
                    152: 
                    153:     /* Code set 1 (BIG5 extended) */
                    154:     ret = big5_wctomb(conv,buf,wc,2);
                    155:     if (ret != RET_ILUNI) {
                    156:       if (ret != 2) abort();
                    157:       if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
                    158:         if (n >= count+2) {
                    159:           r[0] = buf[0];
                    160:           r[1] = buf[1];
                    161:           conv->ostate = 0;
                    162:           return count+2;
                    163:         } else
                    164:           return RET_TOOSMALL;
                    165:       }
                    166:     }
                    167:     ret = hkscs1999_wctomb(conv,buf,wc,2);
                    168:     if (ret != RET_ILUNI) {
                    169:       if (ret != 2) abort();
                    170:       if ((wc & ~0x0020) == 0x00ca) {
                    171:         /* A possible first character of a multi-character sequence. We have to
                    172:            buffer it. */
                    173:         if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
                    174:         conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
                    175:         return count+0;
                    176:       }
                    177:       if (n >= count+2) {
                    178:         r[0] = buf[0];
                    179:         r[1] = buf[1];
                    180:         conv->ostate = 0;
                    181:         return count+2;
                    182:       } else
                    183:         return RET_TOOSMALL;
                    184:     }
                    185:     ret = hkscs2001_wctomb(conv,buf,wc,2);
                    186:     if (ret != RET_ILUNI) {
                    187:       if (ret != 2) abort();
                    188:       if (n >= count+2) {
                    189:         r[0] = buf[0];
                    190:         r[1] = buf[1];
                    191:         conv->ostate = 0;
                    192:         return count+2;
                    193:       } else
                    194:         return RET_TOOSMALL;
                    195:     }
                    196:     return RET_ILUNI;
                    197:   }
                    198: }
                    199: 
                    200: static int
1.1.1.2 ! misho     201: big5hkscs2001_reset (conv_t conv, unsigned char *r, size_t n)
1.1       misho     202: {
                    203:   unsigned char last = conv->ostate;
                    204: 
                    205:   if (last) {
                    206:     if (n < 2)
                    207:       return RET_TOOSMALL;
                    208:     r[0] = 0x88;
                    209:     r[1] = last;
                    210:     /* conv->ostate = 0; will be done by the caller */
                    211:     return 2;
                    212:   } else
                    213:     return 0;
                    214: }