/* Mapping tables for JOHAB handling. Copyright (C) 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Jungshik Shin , 1998. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include /* Direction of the transformation. */ static int to_johab_object; static int from_johab_object; /* The table for Bit pattern to Hangul Jamo 5 bits each are used to encode leading consonants(19 + 1 filler), medial vowels(21 + 1 filler) and trailing consonants(27 + 1 filler). KS C 5601-1992 Annex 3 Table 2 0 : Filler, -1: invalid, >= 1 : valid */ const int init[32] = { -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }; const int mid[32] = { -1, -1, 0, 1, 2, 3, 4, 5, -1, -1, 6, 7, 8, 9, 10, 11, -1, -1, 12, 13, 14, 15, 16, 17, -1, -1, 18, 19, 20, 21, -1, -1 }; const int final[32] = { -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, -1, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, -1, -1 }; /* Hangul Jamo in Johab to Unicode 2.0 : Unicode 2.0 defines 51 Hangul Compatibility Jamos in the block [0x3131,0x314e] It's to be considered later which Jamo block to use, Compatibility block [0x3131,0x314e] or Hangul Conjoining Jamo block, [0x1100,0x11ff] */ const wchar_t init_to_ucs[19] = { 0x3131, 0x3132, 0x3134, 0x3137, 0x3138, 0x3139, 0x3141, 0x3142, 0x3143, 0x3145, 0x3146, 0x3147, 0x3148, 0x3149, 0x314a, 0x314b, 0x314c, 0x314d, 0x314e }; const wchar_t final_to_ucs[27] = { L'\0', L'\0', 0x3133, L'\0', 0x3135, 0x3136, L'\0', L'\0', 0x313a, 0x313b, 0x314c, 0x313d, 0x313e, 0x313f, 0x3140, L'\0', L'\0', 0x3144, L'\0', L'\0', L'\0', L'\0', L'\0', L'\0', L'\0', L'\0', L'\0' }; /* The following three arrays are used to convert precomposed Hangul syllables in [0xac00,0xd???] to Jamo bit patterns for Johab encoding cf. : KS C 5601-1992, Annex3 Table 2 Arrays are used to speed up things although it's possible to get the same result arithmetically. */ const int init_to_bit[19] = { 0x8800, 0x8c00, 0x9000, 0x9400, 0x9800, 0x9c00, 0xa000, 0xa400, 0xa800, 0xac00, 0xb000, 0xb400, 0xb800, 0xbc00, 0xc000, 0xc400, 0xc800, 0xcc00, 0xd000 }; const int mid_to_bit[21] = { 0x0060, 0x0080, 0x00a0, 0x00c0, 0x00e0, 0x0140, 0x0160, 0x0180, 0x01a0, 0x01c0, 0x1e0, 0x0240, 0x0260, 0x0280, 0x02a0, 0x02c0, 0x02e0, 0x0340, 0x0360, 0x0380, 0x03a0 }; const int final_to_bit[28] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d }; /* The conversion table from UCS4 Hangul Compatibility Jamo in [0x3131,0x3163] to Johab cf. 1. KS C 5601-1992 Annex 3 Table 2 2. Unicode 2.0 manual */ const uint16_t jamo_from_ucs_table[51] = { 0x8841, 0x8c41, 0x8444, 0x9041, 0x8446, 0x8447, 0x9441, 0x9841, 0x9c41, 0x844a, 0x844b, 0x844c, 0x844d, 0x884e, 0x884f, 0x8450, 0xa041, 0xa441, 0xa841, 0x8454, 0xac41, 0xb041, 0xb441, 0xb841, 0xbc41, 0xc041, 0xc441, 0xc841, 0xca41, 0xd041, 0x8461, 0x8481, 0x84a1, 0x84c1, 0x84e1, 0x8541, 0x8561, 0x8581, 0x85a1, 0x85c1, 0x85e1, 0x8641, 0x8661, 0x8681, 0x86a1, 0x86c1, 0x86e1, 0x8741, 0x8761, 0x8781, 0x87a1 }; static inline wchar_t johab_sym_hanja_to_ucs (int idx, int c1, int c2) { if (idx <= 0xdefe) return (wchar_t) ksc5601_sym_to_ucs[(c1 - 0xd9) * 188 + c2 - (c2 > 0x90 ? 0x43 : 0x31)]; else return (wchar_t) ksc5601_hanja_to_ucs[(c1 - 0xe0) * 188 + c2 - (c2 > 0x90 ? 0x43 : 0x31)]; } static uint16_t johab_hanja_from_ucs (wchar_t ch) { uint16_t idx; if (ucs4_to_ksc5601_hanja (ch, &idx)) { int idx1, idx2; /* Hanja begins at the 42th row. 42=0x2a : 0x2a + 0x20 = 0x4a. */ idx1 = idx / 256 - 0x4a; idx2 = idx % 256 + 0x80; return ((idx1 / 2) * 256 + 0xe000 + idx2 + (idx1 % 2 ? 0 : (idx2 > 0xee ? 0x43 : 0x31) - 0xa1)); } else return 0; } static uint16_t johab_sym_from_ucs (wchar_t ch) { uint16_t idx; if (ucs4_to_ksc5601_sym (ch, &idx)) { int idx1, idx2; idx1 = idx / 256 - 0x21; idx2 = idx % 256 + 0x80; return ((idx1 / 2) * 256 + 0xd900 + idx2 + (idx1 % 2 ? 0 : (idx2 > 0xee ? 0x43 : 0x31) - 0xa1)); } else return 0; } static inline void johab_from_ucs4 (wchar_t ch, unsigned char *cp) { if (ch >= 0x7f) { int idx; if (ch >= 0xac00 && ch <= 0xd7a3) { ch -= 0xac00; idx = init_to_bit[ch / 588]; /* 21*28 = 588 */ idx += mid_to_bit[(ch / 28) % 21]; /* (ch % (21 * 28)) / 28 */ idx += final_to_bit[ch % 28]; /* (ch % (21 * 28)) % 28 */ } /* KS C 5601-1992 Annex 3 regards 0xA4DA(Hangul Filler : U3164) as symbol */ else if (ch >= 0x3131 && ch <= 0x3163) idx = jamo_from_ucs_table[ch - 0x3131]; else if (ch >= 0x4e00 && ch <= 0x9fa5 || ch >= 0xf900 && ch <= 0xfa0b) idx = johab_hanja_from_ucs (ch); /* Half-width Korean Currency Won Sign else if ( ch == 0x20a9 ) idx = 0x5c00; */ else idx = johab_sym_from_ucs (ch); *cp = (char) (idx / 256); *(cp + 1) = (char) (idx & 0xff); } else { *cp = (char) (0x7f & ch); *(cp + 1) = (char) 0; } } int gconv_init (struct gconv_step *step) { /* Determine which direction. */ if (strcasestr (step->from_name, "JOHAB") != NULL) step->data = &from_johab_object; else if (strcasestr (step->to_name, "JOHAB") != NULL) step->data = &to_johab_object; else return GCONV_NOCONV; return GCONV_OK; } void gconv_end (struct gconv_step *data) { /* Nothing to do. */ } int gconv (struct gconv_step *step, struct gconv_step_data *data, const char *inbuf, size_t *inbufsize, size_t * written, int do_flush) { struct gconv_step *next_step = step + 1; struct gconv_step_data *next_data = data + 1; gconv_fct fct = next_step->fct; size_t do_write; int result; /* If the function is called with no input this means we have to reset to the initial state. The possibly partly converted input is dropped. */ if (do_flush) { do_write = 0; /* Call the steps down the chain if there are any. */ if (data->is_last) result = GCONV_OK; else { struct gconv_step *next_step = step + 1; struct gconv_step_data *next_data = data + 1; result = (*fct) (next_step, next_data, NULL, 0, written, 1); /* Clear output buffer. */ data->outbufavail = 0; } } else { do_write = 0; do { result = GCONV_OK; if (step->data == &from_johab_object) { size_t inchars = *inbufsize; size_t outwchars = data->outbufavail; char *outbuf = data->outbuf; size_t cnt = 0; while (cnt < inchars && (outwchars + sizeof (wchar_t) <= data->outbufsize)) { int inchar = (unsigned char) inbuf[cnt]; wchar_t ch; /* half-width Korean Currency WON sign if (inchar == 0x5c) ch = 0x20a9; else if (inchar < 0x7f) ch = (wchar_t) inchar; */ if (inchar < 0x7f) ch = (wchar_t) inchar; /* Johab : 1. Hangul 1st byte : 0x84-0xd3 2nd byte : 0x41-0x7e, 0x81-0xfe 2. Hanja & Symbol : 1st byte : 0xd8-0xde, 0xe0-0xf9 2nd byte : 0x31-0x7e, 0x91-0xfe 0xd831-0xd87e and 0xd891-0xd8fe are user-defined area */ else if (inchar > 0xf9 || inchar == 0xdf || (inchar > 0x7e && inchar < 0x84) || (inchar > 0xd3 && inchar < 0xd9)) /* These are illegal. */ ch = L'\0'; else { /* Two-byte character. First test whether the next character is also available. */ int inchar2; int idx; if (cnt + 1 >= inchars) { /* The second character is not available. Store the intermediate result. */ result = GCONV_INCOMPLETE_INPUT; break; } inchar2 = (unsigned char) inbuf[++cnt]; idx = inchar * 256 + inchar2; if (inchar <= 0xd3) { /* Hangul */ int i, m, f; i = init[(idx & 0x7c00) >> 10]; m = mid[(idx & 0x03e0) >> 5]; f = final[idx & 0x001f]; if (i == -1 || m == -1 || f == -1) /* This is illegal. */ ch = L'\0'; else if (i > 0 && m > 0) ch = ((i - 1) * 21 + (m - 1)) * 28 + f + 0xac00; else if (i > 0 && m == 0 & f == 0) ch = init_to_ucs[i - 1]; else if (i == 0 && m > 0 & f == 0) ch = 0x314e + m; /* 0x314f + m - 1 */ else if (i == 0 && m == 0 & f > 0) ch = final_to_ucs[f - 1]; /* round trip?? */ else /* This is illegal. */ ch = L'\0'; } else { if (inchar2 < 0x31 || (inchar2 > 0x7e && inchar2 < 0x91) || inchar2 == 0xff) /* This is illegal. */ ch = L'\0'; else if (inchar == 0xda && inchar2 > 0xa0 && inchar2 < 0xd4) /* This is illegal. */ /* Modern Hangul Jaso is defined elsewhere in Johab */ ch = L'\0'; else { ch = johab_sym_hanja_to_ucs (idx, inchar, inchar2); /* if (idx <= 0xdefe) ch = ksc5601_sym_to_ucs[(inchar - 0xd9) * 192 + inchar2 - (inchar2>0x90 ? 0x43 : 0x31)]; else ch = ksc5601_hanja_to_ucs[(inchar - 0xe0) *192 + inchar2 - (inchar2>0x90 ? 0x43 : 0x31)]; */ } } if (ch == L'\0') --cnt; } if (ch == L'\0' && inbuf[cnt] != '\0') { /* This is an illegal character. */ result = GCONV_ILLEGAL_INPUT; break; } *((wchar_t *) (outbuf + outwchars)) = ch; ++do_write; outwchars += sizeof (wchar_t); ++cnt; } *inbufsize -= cnt; data->outbufavail = outwchars; } else { size_t inwchars = *inbufsize; size_t outchars = data->outbufavail; char *outbuf = data->outbuf; size_t cnt = 0; int extra = 0; while (inwchars >= cnt + sizeof (wchar_t) && outchars < data->outbufsize) { wchar_t ch = *((wchar_t *) (inbuf + cnt)); unsigned char cp[2]; /* if (ch >= (sizeof (from_ucs4_lat1) / sizeof (from_ucs4_lat1[0]))) { if (ch >= 0x0391 && ch <= 0x0451) cp = from_ucs4_greek[ch - 0x391]; else if (ch >= 0x2010 && ch <= 0x9fa0) cp = from_ucs4_cjk[ch - 0x02010]; else break; } else cp = from_ucs4_lat1[ch]; */ johab_from_ucs4 (ch, cp); if (cp[0] == '\0' && ch != 0) /* Illegal character. */ break; outbuf[outchars] = cp[0]; /* Now test for a possible second byte and write this if possible. */ if (cp[1] != '\0') { if (outchars + 1 >= data->outbufsize) { /* The result does not fit into the buffer. */ extra = 1; break; } outbuf[++outchars] = cp[1]; } ++do_write; ++outchars; cnt += sizeof (wchar_t); } *inbufsize -= cnt; data->outbufavail = outchars; if (outchars + extra < data->outbufsize) { /* If there is still room in the output buffer something is wrong with the input. */ if (inwchars >= cnt + sizeof (wchar_t)) { /* An error occurred. */ result = GCONV_ILLEGAL_INPUT; break; } if (inwchars != cnt) { /* There are some unprocessed bytes at the end of the input buffer. */ result = GCONV_INCOMPLETE_INPUT; break; } } } if (result != GCONV_OK) break; if (data->is_last) { /* This is the last step. */ result = (*inbufsize > (step->data == &from_johab_object ? 0 : sizeof (wchar_t) - 1) ? GCONV_FULL_OUTPUT : GCONV_EMPTY_INPUT); break; } /* Status so far. */ result = GCONV_EMPTY_INPUT; if (data->outbufavail > 0) { /* Call the functions below in the chain. */ size_t newavail = data->outbufavail; result = (*fct) (next_step, next_data, data->outbuf, &newavail, written, 0); /* Correct the output buffer. */ if (newavail != data->outbufavail && newavail > 0) { memmove (data->outbuf, &data->outbuf[data->outbufavail - newavail], newavail); data->outbufavail = newavail; } } } while (*inbufsize > 0 && result == GCONV_EMPTY_INPUT); } if (written != NULL && data->is_last) *written = do_write; return result; }