| /* |
| * Copyright (C) 1999-2002 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 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 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with the GNU LIBICONV Library; see the file COPYING.LIB. |
| * If not, write to the Free Software Foundation, Inc., 51 Franklin Street, |
| * Fifth Floor, Boston, MA 02110-1301, USA. |
| */ |
| |
| /* |
| * SHIFT_JIS |
| */ |
| |
| /* |
| Conversion between SJIS codes (s1,s2) and JISX0208 codes (c1,c2): |
| Example. (s1,s2) = 0x8140, (c1,c2) = 0x2121. |
| 0x81 <= s1 <= 0x9F || 0xE0 <= s1 <= 0xEA, |
| 0x40 <= s2 <= 0x7E || 0x80 <= s2 <= 0xFC, |
| 0x21 <= c1 <= 0x74, 0x21 <= c2 <= 0x7E. |
| Invariant: |
| 94*2*(s1 < 0xE0 ? s1-0x81 : s1-0xC1) + (s2 < 0x80 ? s2-0x40 : s2-0x41) |
| = 94*(c1-0x21)+(c2-0x21) |
| Conversion (s1,s2) -> (c1,c2): |
| t1 := (s1 < 0xE0 ? s1-0x81 : s1-0xC1) |
| t2 := (s2 < 0x80 ? s2-0x40 : s2-0x41) |
| c1 := 2*t1 + (t2 < 0x5E ? 0 : 1) + 0x21 |
| c2 := (t2 < 0x5E ? t2 : t2-0x5E) + 0x21 |
| Conversion (c1,c2) -> (s1,s2): |
| t1 := (c1 - 0x21) >> 1 |
| t2 := ((c1 - 0x21) & 1) * 0x5E + (c2 - 0x21) |
| s1 := (t1 < 0x1F ? t1+0x81 : t1+0xC1) |
| s2 := (t2 < 0x3F ? t2+0x40 : t2+0x41) |
| */ |
| |
| static int |
| sjis_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n) |
| { |
| unsigned char c = *s; |
| if (c < 0x80 || (c >= 0xa1 && c <= 0xdf)) |
| return jisx0201_mbtowc(conv,pwc,s,n); |
| else { |
| unsigned char s1, s2; |
| s1 = c; |
| if ((s1 >= 0x81 && s1 <= 0x9f) || (s1 >= 0xe0 && s1 <= 0xea)) { |
| if (n < 2) |
| return RET_TOOFEW(0); |
| s2 = s[1]; |
| if ((s2 >= 0x40 && s2 <= 0x7e) || (s2 >= 0x80 && s2 <= 0xfc)) { |
| unsigned char t1 = (s1 < 0xe0 ? s1-0x81 : s1-0xc1); |
| unsigned char t2 = (s2 < 0x80 ? s2-0x40 : s2-0x41); |
| unsigned char buf[2]; |
| buf[0] = 2*t1 + (t2 < 0x5e ? 0 : 1) + 0x21; |
| buf[1] = (t2 < 0x5e ? t2 : t2-0x5e) + 0x21; |
| return jisx0208_mbtowc(conv,pwc,buf,2); |
| } |
| } else if (s1 >= 0xf0 && s1 <= 0xf9) { |
| /* User-defined range. See |
| * Ken Lunde's "CJKV Information Processing", table 4-66, p. 206. */ |
| if (n < 2) |
| return RET_TOOFEW(0); |
| s2 = s[1]; |
| if ((s2 >= 0x40 && s2 <= 0x7e) || (s2 >= 0x80 && s2 <= 0xfc)) { |
| *pwc = 0xe000 + 188*(s1 - 0xf0) + (s2 < 0x80 ? s2-0x40 : s2-0x41); |
| return 2; |
| } |
| } |
| return RET_ILSEQ; |
| } |
| } |
| |
| static int |
| sjis_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) |
| { |
| unsigned char buf[2]; |
| int ret; |
| |
| /* Try JIS X 0201-1976. */ |
| ret = jisx0201_wctomb(conv,buf,wc,1); |
| if (ret != RET_ILUNI) { |
| unsigned char c; |
| if (ret != 1) abort(); |
| c = buf[0]; |
| if (c < 0x80 || (c >= 0xa1 && c <= 0xdf)) { |
| r[0] = c; |
| return 1; |
| } |
| } |
| |
| /* Try JIS X 0208-1990. */ |
| ret = jisx0208_wctomb(conv,buf,wc,2); |
| if (ret != RET_ILUNI) { |
| unsigned char c1, c2; |
| if (ret != 2) abort(); |
| if (n < 2) |
| return RET_TOOSMALL; |
| c1 = buf[0]; |
| c2 = buf[1]; |
| if ((c1 >= 0x21 && c1 <= 0x74) && (c2 >= 0x21 && c2 <= 0x7e)) { |
| unsigned char t1 = (c1 - 0x21) >> 1; |
| unsigned char t2 = (((c1 - 0x21) & 1) ? 0x5e : 0) + (c2 - 0x21); |
| r[0] = (t1 < 0x1f ? t1+0x81 : t1+0xc1); |
| r[1] = (t2 < 0x3f ? t2+0x40 : t2+0x41); |
| return 2; |
| } |
| } |
| |
| /* User-defined range. See |
| * Ken Lunde's "CJKV Information Processing", table 4-66, p. 206. */ |
| if (wc >= 0xe000 && wc < 0xe758) { |
| unsigned char c1, c2; |
| if (n < 2) |
| return RET_TOOSMALL; |
| c1 = (unsigned int) (wc - 0xe000) / 188; |
| c2 = (unsigned int) (wc - 0xe000) % 188; |
| r[0] = c1+0xf0; |
| r[1] = (c2 < 0x3f ? c2+0x40 : c2+0x41); |
| return 2; |
| } |
| |
| return RET_ILUNI; |
| } |