ruby--ruby/enc/trans/japanese.trans

#include "transcode_data.h"

<%
  map = {}
  map["{00-7f}"] = :nomap
  map["{a1-fe}{a1-fe}"] = :func_so
  map["8e{a1-df}"] = :func_so
  map["8e{e0-fe}"] = :undef
  map["8f{a1-fe}{a1-fe}"] = :undef
  transcode_generate_node(ActionMap.parse(map), "eucjp2sjis")

  map = {}
  map["{00-7f}"] = :nomap
  map["{81-9f,e0-ef}{40-7e,80-fc}"] = :func_so
  map["{f0-fc}{40-7e,80-fc}"] = :undef
  map["{a1-df}"] = :func_so
  transcode_generate_node(ActionMap.parse(map), "sjis2eucjp")
%>

<%= transcode_generated_code %>

static int
fun_so_eucjp2sjis(void *statep, const unsigned char *s, size_t l, unsigned char *o)
{
    if (s[0] == 0x8e) {
        o[0] = s[1];
        return 1;
    }
    else {
        int h, m, l;
        m = s[0] & 1;
        h = (s[0]+m) >> 1;
        h += s[0] < 0xdf ? 0x30 : 0x70;
        l = s[1] - m * 94 - 3;
        if (0x7f <= l)
            l++;
        o[0] = h;
        o[1] = l;
        return 2;
    }
}

static int
fun_so_sjis2eucjp(void *statep, const unsigned char *s, size_t l, unsigned char *o)
{
    if (l == 1) {
        o[0] = '\x8e';
        o[1] = s[0];
        return 2;
    }
    else {
        int h, l;
        h = s[0];
        l = s[1];
        if (0xe0 <= h)
            h -= 64;
        l += l < 0x80 ? 0x61 : 0x60;
        h = h * 2 - 0x61;
        if (0xfe < l) {
            l -= 94;
            h += 1;
        }
        o[0] = h;
        o[1] = l;
        return 2;
    }
}

static const rb_transcoder
rb_eucjp2sjis = {
    "EUC-JP", "Shift_JIS", eucjp2sjis,
    TRANSCODE_TABLE_INFO,
    1, /* input_unit_length */
    3, /* max_input */
    2, /* max_output */
    asciicompat_converter, /* asciicompat_type */
    0, NULL, NULL, /* state_size, state_init, state_fini */
    NULL, NULL, NULL, fun_so_eucjp2sjis
};

static const rb_transcoder
rb_sjis2eucjp = {
    "Shift_JIS", "EUC-JP", sjis2eucjp,
    TRANSCODE_TABLE_INFO,
    1, /* input_unit_length */
    2, /* max_input */
    2, /* max_output */
    asciicompat_converter, /* asciicompat_type */
    0, NULL, NULL, /* state_size, state_init, state_fini */
    NULL, NULL, NULL, fun_so_sjis2eucjp
};

void
Init_japanese(void)
{
    rb_register_transcoder(&rb_eucjp2sjis);
    rb_register_transcoder(&rb_sjis2eucjp);
}