(*
Copyright 2016 Anton Krotov
This file is part of fb2read.
fb2read is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
fb2read 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with fb2read. If not, see <http://www.gnu.org/licenses/>.
*)
MODULE Conv;
IMPORT sys := SYSTEM, Encode;
VAR table: ARRAY 65536 OF CHAR;
PROCEDURE GetUtf8 (str: INTEGER; VAR val, idx: INTEGER);
VAR ch: CHAR;
BEGIN
sys.GET(str + idx, ch); INC(idx);
IF ch < 80X THEN
val := ORD(ch)
ELSIF ch < 0E0X THEN
val := ORD(ch) - 192;
sys.GET(str + idx, ch); INC(idx);
val := val * 64 + ORD(ch) - 128
ELSE
val := ORD(ch) - 224;
sys.GET(str + idx, ch); INC(idx); val := val * 64 + ORD(ch) - 128;
sys.GET(str + idx, ch); INC(idx); val := val * 64 + ORD(ch) - 128
END
END GetUtf8;
PROCEDURE convert*(adr, adr2: INTEGER; len: INTEGER);
VAR val, idx: INTEGER;
BEGIN
idx := 0;
WHILE len > 0 DO
GetUtf8(adr, val, idx);
IF (0 <= val) & (val < LEN(table)) THEN
sys.PUT(adr2, table[val])
ELSE
sys.PUT(adr2, "?")
END;
INC(adr2);
DEC(len)
END
END convert;
PROCEDURE utf8to1251(code: INTEGER): CHAR;
VAR res: CHAR; i: INTEGER;
BEGIN
res := "?";
i := 0;
WHILE i <= 255 DO
IF Encode.W1251[i].code = code THEN
res := CHR(i);
i := 255
END;
INC(i)
END
RETURN res
END utf8to1251;
PROCEDURE main;
VAR i: INTEGER;
BEGIN
FOR i := 0 TO LEN(table) - 1 DO
table[i] := utf8to1251(i)
END
END main;
BEGIN
main
END Conv.