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Annotation of embedaddon/libiconv/lib/johab.h, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 1999-2001, 2007 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:  * JOHAB
        !            23:  */
        !            24: 
        !            25: /*
        !            26:    Conversion between JOHAB codes (s1,s2) and KSX1001 codes (c1,c2):
        !            27:    Example. (s1,s2) = 0xD931, (c1,c2) = 0x2121.
        !            28:             (s1,s2) = 0xDEF1, (c1,c2) = 0x2C71.
        !            29:             (s1,s2) = 0xE031, (c1,c2) = 0x4A21.
        !            30:             (s1,s2) = 0xF9FE, (c1,c2) = 0x7D7E.
        !            31:    0xD9 <= s1 <= 0xDE || 0xE0 <= s1 <= 0xF9,
        !            32:    0x31 <= s2 <= 0x7E || 0x91 <= s2 <= 0xFE,
        !            33:    0x21 <= c1 <= 0x2C || 0x4A <= c1 <= 0x7D,
        !            34:    0x21 <= c2 <= 0x7E.
        !            35:    Invariant:
        !            36:      94*(s1 < 0xE0 ? 2*s1-0x1B2 : 2*s1-0x197) + (s2 < 0x91 ? s2-0x31 : s2-0x43)
        !            37:      = 94*(c1-0x21)+(c2-0x21)
        !            38:    Conversion (s1,s2) -> (c1,c2):
        !            39:      t1 := (s1 < 0xE0 ? 2*s1-0x1B2 : 2*s1-0x197)
        !            40:      t2 := (s2 < 0x91 ? s2-0x31 : s2-0x43)
        !            41:      c1 := t1 + (t2 < 0x5E ? 0 : 1) + 0x21
        !            42:      c2 := (t2 < 0x5E ? t2 : t2-0x5E) + 0x21
        !            43:    Conversion (c1,c2) -> (s1,s2):
        !            44:      t := (c1 < 0x4A ? (c1-0x21+0x1B2) : (c1-0x21+0x197))
        !            45:      s1 := t >> 1
        !            46:      t2 := (t & 1) * 0x5E + (c2 - 0x21)
        !            47:      s2 := (t2 < 0x4E ? t2+0x31 : t2+0x43)
        !            48:  */
        !            49: 
        !            50: static int
        !            51: johab_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
        !            52: {
        !            53:   unsigned char c = *s;
        !            54:   if (c < 0x80) {
        !            55:     if (c == 0x5c)
        !            56:       *pwc = (ucs4_t) 0x20a9;
        !            57:     else
        !            58:       *pwc = (ucs4_t) c;
        !            59:     return 1;
        !            60:   } else if (c < 0xd8) {
        !            61:     return johab_hangul_mbtowc(conv,pwc,s,n);
        !            62:   } else {
        !            63:     unsigned char s1, s2;
        !            64:     s1 = c;
        !            65:     if ((s1 >= 0xd9 && s1 <= 0xde) || (s1 >= 0xe0 && s1 <= 0xf9)) {
        !            66:       if (n < 2)
        !            67:         return RET_TOOFEW(0);
        !            68:       s2 = s[1];
        !            69:       if ((s2 >= 0x31 && s2 <= 0x7e) || (s2 >= 0x91 && s2 <= 0xfe)) {
        !            70:         /* In KSC 5601, now KS X 1001, the region s1 = 0xDA, 0xA1 <= s2 <= 0xD3
        !            71:            contains the 51 Jamo (Hangul letters). But in the Johab encoding,
        !            72:            they have been moved to the Hangul section, see
        !            73:            johab_hangul_page31. */
        !            74:         if (!(s1 == 0xda && (s2 >= 0xa1 && s2 <= 0xd3))) {
        !            75:           unsigned char t1 = (s1 < 0xe0 ? 2*(s1-0xd9) : 2*s1-0x197);
        !            76:           unsigned char t2 = (s2 < 0x91 ? s2-0x31 : s2-0x43);
        !            77:           unsigned char buf[2];
        !            78:           buf[0] = t1 + (t2 < 0x5e ? 0 : 1) + 0x21;
        !            79:           buf[1] = (t2 < 0x5e ? t2 : t2-0x5e) + 0x21;
        !            80:           return ksc5601_mbtowc(conv,pwc,buf,2);
        !            81:         }
        !            82:       }
        !            83:     }
        !            84:     return RET_ILSEQ;
        !            85:   }
        !            86: }
        !            87: 
        !            88: static int
        !            89: johab_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
        !            90: {
        !            91:   unsigned char buf[2];
        !            92:   int ret;
        !            93: 
        !            94:   /* Try ASCII variation. */
        !            95:   if (wc < 0x0080 && wc != 0x005c) {
        !            96:     *r = wc;
        !            97:     return 1;
        !            98:   }
        !            99:   if (wc == 0x20a9) {
        !           100:     *r = 0x5c;
        !           101:     return 1;
        !           102:   }
        !           103: 
        !           104:   /* Try JOHAB Hangul table before KSC5601 table, because the KSC5601 table
        !           105:      contains some (2350 out of 11172) Hangul syllables (rows 0x30XX..0x48XX),
        !           106:      and we want the search to return the JOHAB Hangul table entry. */
        !           107: 
        !           108:   /* Try JOHAB Hangul. */
        !           109:   ret = johab_hangul_wctomb(conv,buf,wc,2);
        !           110:   if (ret != RET_ILUNI) {
        !           111:     if (ret != 2) abort();
        !           112:     if (n < 2)
        !           113:       return RET_TOOSMALL;
        !           114:     r[0] = buf[0];
        !           115:     r[1] = buf[1];
        !           116:     return 2;
        !           117:   }
        !           118: 
        !           119:   /* Try KSC5601, now KS X 1001. */
        !           120:   ret = ksc5601_wctomb(conv,buf,wc,2);
        !           121:   if (ret != RET_ILUNI) {
        !           122:     unsigned char c1, c2;
        !           123:     if (ret != 2) abort();
        !           124:     if (n < 2)
        !           125:       return RET_TOOSMALL;
        !           126:     c1 = buf[0];
        !           127:     c2 = buf[1];
        !           128:     if (((c1 >= 0x21 && c1 <= 0x2c) || (c1 >= 0x4a && c1 <= 0x7d))
        !           129:         && (c2 >= 0x21 && c2 <= 0x7e)) {
        !           130:       unsigned int t = (c1 < 0x4A ? (c1-0x21+0x1B2) : (c1-0x21+0x197));
        !           131:       unsigned char t2 = ((t & 1) ? 0x5e : 0) + (c2 - 0x21);
        !           132:       r[0] = t >> 1;
        !           133:       r[1] = (t2 < 0x4e ? t2+0x31 : t2+0x43);
        !           134:       return 2;
        !           135:     }
        !           136:   }
        !           137: 
        !           138:   return RET_ILUNI;
        !           139: }