/* * Copyright (C) 1999-2001, 2016 Free Software Foundation, Inc. * This file is part of the GNU LIBICONV Library. * * The GNU LIBICONV Library is free software; you can redistribute it * and/or modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either version 2.1 * of the License, or (at your option) any later version. * * The GNU LIBICONV Library is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with the GNU LIBICONV Library; see the file COPYING.LIB. * If not, see . */ /* * JOHAB Hangul * * Ken Lunde writes in his "CJKV Information Processing" book, p. 114: * "Hangul can be composed of two or three jamo (some jamo are considered * compound). Johab uses 19 initial jamo (consonants), 21 medial jamo (vowels) * and 27 final jamo (consonants; 28 when you include the "fill" character * for Hangul containing only two jamo). Multiplying these numbers results in * 11172." * * Structure of the Johab encoding (see p. 181-184): * bit 15 = 1 * bit 14..10 = initial jamo, only 19+1 out of 32 possible values are used * bit 9..5 = medial jamo, only 21+1 out of 32 possible values are used * bit 4..0 = final jamo, only 27+1 out of 32 possible values are used * * Structure of the Unicode encoding: * grep '^0x\([8-C]...\|D[0-7]..\)' unicode.org-mappings/EASTASIA/KSC/JOHAB.TXT * You see that all characters there are marked "HANGUL LETTER" or "HANGUL * SYLLABLE". If you eliminate the "HANGUL LETTER"s, the table is sorted * in ascending order according to Johab encoding and according to the Unicode * encoding. Now look a little more carefully, and you see that the following * formula holds: * unicode == 0xAC00 * + 21 * 28 * (jamo_initial_index[(johab >> 10) & 31] - 1) * + 28 * (jamo_medial_index[(johab >> 5) & 31] - 1) * + jamo_final_index[johab & 31] * where the index tables are defined as below. */ /* Tables mapping 5-bit groups to jamo letters. */ /* Note that Jamo XX = UHC 0xA4A0+XX = Unicode 0x3130+XX */ #define NONE 0xfd #define FILL 0xff static const unsigned char jamo_initial[32] = { NONE, FILL, 0x01, 0x02, 0x04, 0x07, 0x08, 0x09, 0x11, 0x12, 0x13, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, }; static const unsigned char jamo_medial[32] = { NONE, NONE, FILL, 0x1f, 0x20, 0x21, 0x22, 0x23, NONE, NONE, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, NONE, NONE, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, NONE, NONE, 0x30, 0x31, 0x32, 0x33, NONE, NONE, }; static const unsigned char jamo_final[32] = { NONE, FILL, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, NONE, 0x12, 0x14, 0x15, 0x16, 0x17, 0x18, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, NONE, NONE, }; /* Same as jamo_final, except that it excludes characters already contained in jamo_initial. 11 characters instead of 27. */ static const unsigned char jamo_final_notinitial[32] = { NONE, NONE, NONE, NONE, 0x03, NONE, 0x05, 0x06, NONE, NONE, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, NONE, NONE, NONE, 0x14, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE, }; /* Tables mapping 5-bit groups to packed indices. */ #define none -1 #define fill 0 static const signed char jamo_initial_index[32] = { none, fill, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, none, none, none, none, none, none, none, none, none, none, none, }; static const signed char jamo_medial_index[32] = { none, none, fill, 0x01, 0x02, 0x03, 0x04, 0x05, none, none, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, none, none, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, none, none, 0x12, 0x13, 0x14, 0x15, none, none, }; static const signed char jamo_final_index[32] = { none, fill, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, none, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, none, none, }; static int johab_hangul_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n) { unsigned char c1 = s[0]; if ((c1 >= 0x84 && c1 <= 0xd3)) { if (n >= 2) { unsigned char c2 = s[1]; if ((c2 >= 0x41 && c2 < 0x7f) || (c2 >= 0x81 && c2 < 0xff)) { unsigned int johab = (c1 << 8) | c2; unsigned int bitspart1 = (johab >> 10) & 31; unsigned int bitspart2 = (johab >> 5) & 31; unsigned int bitspart3 = johab & 31; int index1 = jamo_initial_index[bitspart1]; int index2 = jamo_medial_index[bitspart2]; int index3 = jamo_final_index[bitspart3]; /* Exclude "none" values. */ if (index1 >= 0 && index2 >= 0 && index3 >= 0) { /* Deal with "fill" values in initial or medial position. */ if (index1 == fill) { if (index2 == fill) { unsigned char jamo3 = jamo_final_notinitial[bitspart3]; if (jamo3 != NONE) { *pwc = (ucs4_t) 0x3130 + jamo3; return 2; } } else if (index3 == fill) { unsigned char jamo2 = jamo_medial[bitspart2]; if (jamo2 != NONE && jamo2 != FILL) { *pwc = (ucs4_t) 0x3130 + jamo2; return 2; } } /* Syllables composed only of medial and final don't exist. */ } else if (index2 == fill) { if (index3 == fill) { unsigned char jamo1 = jamo_initial[bitspart1]; if (jamo1 != NONE && jamo1 != FILL) { *pwc = (ucs4_t) 0x3130 + jamo1; return 2; } } /* Syllables composed only of initial and final don't exist. */ } else { /* index1 and index2 are not fill, but index3 may be fill. */ /* Nothing more to exclude. All 11172 code points are valid. */ *pwc = 0xac00 + ((index1 - 1) * 21 + (index2 - 1)) * 28 + index3; return 2; } } } return RET_ILSEQ; } return RET_TOOFEW(0); } return RET_ILSEQ; } /* 51 Jamo: 19 initial, 21 medial, 11 final not initial. */ static const unsigned short johab_hangul_page31[51] = { 0x8841, 0x8c41, 0x8444, 0x9041, 0x8446, 0x8447, 0x9441, /*0x30-0x37*/ 0x9841, 0x9c41, 0x844a, 0x844b, 0x844c, 0x844d, 0x844e, 0x844f, /*0x38-0x3f*/ 0x8450, 0xa041, 0xa441, 0xa841, 0x8454, 0xac41, 0xb041, 0xb441, /*0x40-0x47*/ 0xb841, 0xbc41, 0xc041, 0xc441, 0xc841, 0xcc41, 0xd041, 0x8461, /*0x48-0x4f*/ 0x8481, 0x84a1, 0x84c1, 0x84e1, 0x8541, 0x8561, 0x8581, 0x85a1, /*0x50-0x57*/ 0x85c1, 0x85e1, 0x8641, 0x8661, 0x8681, 0x86a1, 0x86c1, 0x86e1, /*0x58-0x5f*/ 0x8741, 0x8761, 0x8781, 0x87a1, /*0x60-0x67*/ }; /* Tables mapping packed indices to 5-bit groups. */ /* index1+1 = jamo_initial_index[bitspart1] <==> bitspart1 = jamo_initial_index_inverse[index1] */ static const char jamo_initial_index_inverse[19] = { 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, }; /* index2+1 = jamo_medial_index[bitspart2] <==> bitspart2 = jamo_medial_index_inverse[index2] */ static const char jamo_medial_index_inverse[21] = { 0x03, 0x04, 0x05, 0x06, 0x07, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x1a, 0x1b, 0x1c, 0x1d, }; /* index3 = jamo_final_index[bitspart3] <==> bitspart3 = jamo_final_index_inverse[index3] */ static const char jamo_final_index_inverse[28] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, }; static int johab_hangul_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) { if (n >= 2) { if (wc >= 0x3131 && wc < 0x3164) { unsigned short c = johab_hangul_page31[wc-0x3131]; r[0] = (c >> 8); r[1] = (c & 0xff); return 2; } else if (wc >= 0xac00 && wc < 0xd7a4) { unsigned int index1; unsigned int index2; unsigned int index3; unsigned short c; unsigned int tmp = wc - 0xac00; index3 = tmp % 28; tmp = tmp / 28; index2 = tmp % 21; tmp = tmp / 21; index1 = tmp; c = (((((1 << 5) | jamo_initial_index_inverse[index1]) << 5) | jamo_medial_index_inverse[index2]) << 5) | jamo_final_index_inverse[index3]; r[0] = (c >> 8); r[1] = (c & 0xff); return 2; } return RET_ILUNI; } return RET_TOOSMALL; } /* * Decomposition of JOHAB Hangul in one to three Johab Jamo elements. */ /* Decompose wc into r[0..2], and return the number of resulting Jamo elements. Return RET_ILUNI if decomposition is not possible. */ static int johab_hangul_decompose (conv_t conv, ucs4_t* r, ucs4_t wc) { unsigned char buf[2]; int ret = johab_hangul_wctomb(conv,buf,wc,2); if (ret != RET_ILUNI) { unsigned int hangul = (buf[0] << 8) | buf[1]; unsigned char jamo1 = jamo_initial[(hangul >> 10) & 31]; unsigned char jamo2 = jamo_medial[(hangul >> 5) & 31]; unsigned char jamo3 = jamo_final[hangul & 31]; if ((hangul >> 15) != 1) abort(); if (jamo1 != NONE && jamo2 != NONE && jamo3 != NONE) { /* They are not all three == FILL because that would correspond to johab = 0x8441, which doesn't exist. */ ucs4_t* p = r; if (jamo1 != FILL) *p++ = 0x3130 + jamo1; if (jamo2 != FILL) *p++ = 0x3130 + jamo2; if (jamo3 != FILL) *p++ = 0x3130 + jamo3; return p-r; } } return RET_ILUNI; } #undef fill #undef none #undef FILL #undef NONE