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------------------------------------------------------------------------------
-- XML/Ada - An XML suite for Ada95 --
-- --
-- Copyright (C) 2001-2017, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
-- This package implements a basic 8bit encoding.
-- Only code points from 16#00# to 16#FF# can be encoded in such strings.
--
-- However, then can be used to read files that contain accented characters,
-- in combination with Unicode.CCS.Iso_8859_1 for instance
with Unicode.CES.Utf32; use Unicode.CES.Utf32;
with Unicode.CCS; use Unicode.CCS;
package body Unicode.CES.Basic_8bit is
function Convert
(Str : Basic_8bit_String;
Convert : Unicode.CCS.Conversion_Function := Identity'Access;
Order : Byte_Order := Default_Byte_Order) return Basic_8bit_String;
-- Internal conversion function
------------
-- Encode --
------------
procedure Encode
(Char : Unicode_Char;
Output : in out Byte_Sequence;
Index : in out Natural) is
begin
if Char > 16#FF# then
raise Invalid_Encoding;
end if;
Index := Index + 1;
Output (Index) := Character'Val (Char);
end Encode;
----------
-- Read --
----------
procedure Read
(Str : Basic_8bit_String;
Index : in out Positive;
Char : out Unicode_Char) is
begin
Char := Character'Pos (Str (Index));
Index := Index + 1;
end Read;
-----------
-- Width --
-----------
function Width (Char : Unicode_Char) return Natural is
pragma Warnings (Off, Char);
begin
return 1;
end Width;
------------
-- Length --
------------
function Length (Str : Basic_8bit_String) return Natural is
begin
return Str'Length;
end Length;
----------------
-- From_Utf32 --
----------------
function From_Utf32
(Str : Unicode.CES.Utf32.Utf32_LE_String)
return Basic_8bit_String
is
Result : Basic_8bit_String (1 .. Str'Length / Utf32_Char_Width);
R_Index : Natural := Result'First - 1;
C : Unicode_Char;
J : Positive := Str'First;
begin
if Str'Length mod Utf32_Char_Width /= 0 then
-- There are extra characters at the end of the string.
raise Incomplete_Encoding;
end if;
while J <= Str'Last - 3 loop
Unicode.CES.Utf32.Read (Str, J, Char => C);
pragma Assert (R_Index < Result'Last);
Encode (C, Result, R_Index);
end loop;
return Result;
end From_Utf32;
--------------
-- To_Utf32 --
--------------
function To_Utf32
(Str : Basic_8bit_String)
return Unicode.CES.Utf32.Utf32_LE_String
is
Result : Utf32_LE_String (1 .. Str'Length * Utf32_Char_Width);
R_Index : Natural := Result'First - 1;
J : Positive := Str'First;
C : Unicode_Char;
begin
while J <= Str'Last loop
Read (Str, J, C);
Unicode.CES.Utf32.Encode (C, Result, R_Index);
end loop;
return Result;
end To_Utf32;
-------------
-- Convert --
-------------
function Convert
(Str : Basic_8bit_String;
Convert : Unicode.CCS.Conversion_Function := Identity'Access;
Order : Byte_Order := Default_Byte_Order) return Basic_8bit_String
is
pragma Warnings (Off, Order);
S : String (Str'Range);
C : Unicode_Char;
J : Positive := Str'First;
J_Out : Natural := S'First - 1;
begin
if Convert = Identity'Access then
return Str;
else
while J <= Str'Last loop
Read (Str, J, C);
Encode (Convert (C), S, J_Out);
end loop;
return S;
end if;
end Convert;
-------------------
-- To_Unicode_LE --
-------------------
function To_Unicode_LE
(Str : Basic_8bit_String;
Cs : Unicode.CCS.Character_Set := Unicode.CCS.Unicode_Character_Set;
Order : Byte_Order := Default_Byte_Order) return Basic_8bit_String is
begin
return Convert (Str, Cs.To_Unicode, Order);
end To_Unicode_LE;
-----------
-- To_CS --
-----------
function To_CS
(Str : Basic_8bit_String;
Cs : Unicode.CCS.Character_Set := Unicode.CCS.Unicode_Character_Set;
Order : Byte_Order := Default_Byte_Order) return Basic_8bit_String is
begin
return Convert (Str, Cs.To_CS, Order);
end To_CS;
end Unicode.CES.Basic_8bit;
|
