/usr/lib/ocaml/lablgtk2/gutf8.ml is in liblablgtk2-ocaml-dev 2.18.5+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(* Lablgtk *)
(* *)
(* This program 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 *)
(* version 2, with the exception described in file COPYING which *)
(* comes with the library. *)
(* *)
(* This program 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 this program; if not, write to the *)
(* Free Software Foundation, Inc., 59 Temple Place, Suite 330, *)
(* Boston, MA 02111-1307 USA *)
(* *)
(* *)
(**************************************************************************)
(* $Id$ *)
type unichar = int
type unistring = unichar array
module Error = struct
type error =
| NO_CONVERSION
| ILLEGAL_SEQUENCE
| FAILED
| PARTIAL_INPUT
| BAD_URI
| NOT_ABSOLUTE_PATH
exception Error of error * string
let raise_bad_utf8 () =
raise (Error (ILLEGAL_SEQUENCE, "Invalid byte sequence for UTF-8 string"))
end
open Error
let rec log64 n =
if n = 0 then 0 else
1 + log64 (n lsr 5)
let utf8_storage_len n =
if n < 0x80 then 1 else
log64 (n lsr 1)
(* this function is not exported, so it's OK to do a few 'unsafe' things *)
let write_unichar s ~pos (c : unichar) =
let len = utf8_storage_len c in
let p = !pos in
if len = 1 then
String.unsafe_set s p (Char.unsafe_chr c)
else begin
String.unsafe_set s p
(Char.unsafe_chr (((1 lsl len - 1) lsl (8-len)) lor (c lsr ((len-1)*6))));
for i = 1 to len-1 do
String.unsafe_set s (p+i)
(Char.unsafe_chr (((c lsr ((len-1-i)*6)) land 0x3f) lor 0x80))
done;
end;
pos := p + len
let from_unichar (n : unichar) =
let s = String.create 6 and pos = ref 0 in
write_unichar s ~pos n;
String.sub s 0 !pos
let from_unistring (s : unistring) =
let len = Array.length s in
let r = String.create (len*6) in
let pos = ref 0 in
for i = 0 to len-1 do write_unichar r ~pos s.(i) done;
String.sub r 0 !pos
let rec hi_bits n =
if n land 0x80 = 0 then 0 else
1 + hi_bits (n lsl 1)
let to_unichar s ~pos : unichar =
let c = Char.code s.[!pos] in
incr pos;
let n = hi_bits c in
if n = 0 then c else (* if string is valid then 2 <= n <= 6 *)
let u = ref (c land (1 lsl (7-n) - 1)) in
for i = 1 to n-1 do
let c = Char.code s.[!pos] in
u := !u lsl 6 + c land 0x3f ;
incr pos
done;
!u
let first_char s =
to_unichar s ~pos:(ref 0)
let validate c =
c < 0x110000 && (c land 0x7FFFF800) <> 0xD800 &&
(c < 0xFDD0 || c > 0xFDEF) && (c land 0xFFFE) <> 0xFFFE
let to_unichar_validated s ~pos : unichar =
let c = Char.code s.[!pos] in
incr pos;
let n = hi_bits c in
if n = 0 then c else begin
if n = 1 || n > 6 then raise_bad_utf8 () ;
if !pos + n > String.length s then
raise (Error(PARTIAL_INPUT, "partial UTF-8 character"));
let u = ref (c land (1 lsl (7-n) - 1)) in
for i = 1 to n-1 do
let c = Char.code s.[!pos] in
if c lsr 6 <> 0b10 then raise_bad_utf8 () ;
u := !u lsl 6 + c land 0x3f ;
incr pos
done;
let v = !u in
(* reject overlong sequences && invalid values *)
if utf8_storage_len v <> n || not (validate v)
then raise_bad_utf8 () ;
v
end
let rec end_of_char s ~pos =
let c = Char.code s.[pos] in
if (c land 0xc0) = 0x80 then end_of_char s ~pos:(pos+1) else pos
let next s ~pos =
let c = Char.code s.[pos] in
let n = hi_bits c in
if n = 0 then pos + 1 else
if n = 1 then end_of_char s ~pos:(pos+1) else pos + n
let length s =
let len = String.length s in
let rec loop count ~pos =
if pos >= len then count else
loop (count+1) ~pos:(next s ~pos)
in loop 0 ~pos:0
let to_unistring s : unistring =
let len = length s in
let us = Array.create len 0 in
let pos = ref 0 in
for i = 0 to len - 1 do
us.(i) <- to_unichar s ~pos
done;
us
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