thodg/libiconv/lib/sjis.h

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• Hash : a615528b
  Author :
  Date : 2000-11-23T19:54:07
  

  Move src/ to lib/, and install the iconv program.
  

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• lib/sjis.h

• 
  /*
   * 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_ILSEQ) {
      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_ILSEQ) {
      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_ILSEQ;
  }
  

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