+local tex_get_attr = tex.getattribute
+
+local cache_var = 2
+local cache_outdate_fn = function (t) return t.version~=cache_ver end
+local ivd_aj1 = ltjb.load_cache('ltj-ivd_aj1',cache_outdate_fn)
+if not ivd_aj1 then -- make cache
+ ivd_aj1 = require('ltj-ivd_aj1.lua')
+ ltjb.save_cache_luc('ltj-ivd_aj1', ivd_aj1)
+end
+
+
+local function get_ucs_from_rmlgbm(c)
+ local v = (ivd_aj1 and ivd_aj1.table_ivd_aj1[c]
+ or ltjr_cidfont_data["Adobe-Japan1"].resources.unicodes["Japan1." .. tostring(c)])
+ or 0
+ if v>=0x200000 then -- table
+ local curjfnt_num = tex_get_attr((ltjd_get_dir_count()==dir_tate)
+ and attr_curtfnt or attr_curjfnt)
+ local curjfnt = identifiers[curjfnt_num].resources
+ local base, ivs = v % 0x200000, 0xE00FF + math.floor(v/0x200000)
+ curjfnt = curjfnt and curjfnt.variants
+ curjfnt = curjfnt and curjfnt[ivs]
+ return curjfnt and curjfnt[base] or base
+ elseif v<0xF0000 then -- 素直に Unicode にマップ可能
+ return v
+ else -- privete use area
+ local w = ltjr_cidfont_data["Adobe-Japan1"].characters[v]. tounicode
+ -- must be non-nil!
+ local i = string.len(w)
+ if i==4 then -- UCS2
+ return tonumber(w,16)
+ elseif i==8 then
+ i,w = tonumber(string.sub(w,1,4),16), tonumber(string.sub(w,-4),16)
+ if (w>=0xD800) and (w<=0xDB7F) and (i>=0xDC00) and (i<=0xDFFF) then -- Surrogate pair
+ return (w-0xD800)*0x400 + (i-0xDC00)
+ else
+ return 0
+ end
+ end
+ end
+end