mirror of
https://github.com/AdaCore/VSS.git
synced 2026-02-12 13:06:25 -08:00
85 lines
3.7 KiB
Ada
85 lines
3.7 KiB
Ada
------------------------------------------------------------------------------
|
|
-- M A G I C R U N T I M E --
|
|
-- --
|
|
-- Copyright (C) 2020-2021, 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. --
|
|
-- --
|
|
-- As a special exception under Section 7 of GPL version 3, you are granted --
|
|
-- additional permissions described in the GCC Runtime Library Exception, --
|
|
-- version 3.1, as published by the Free Software Foundation. --
|
|
-- --
|
|
-- 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/>. --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
-- Utilities to encode/decode UTF-8 encoded data.
|
|
|
|
with Ada.Streams;
|
|
|
|
with VSS.Stream_Element_Vectors;
|
|
with VSS.Unicode;
|
|
|
|
package VSS.Implementation.UTF8_Encoding is
|
|
|
|
pragma Preelaborate;
|
|
|
|
type UTF8_Code_Unit_Array is
|
|
array (VSS.Unicode.UTF8_Code_Unit_Count range <>)
|
|
of VSS.Unicode.UTF8_Code_Unit;
|
|
|
|
subtype UTF8_Sequence_Length
|
|
is VSS.Unicode.UTF8_Code_Unit_Count range 1 .. 4;
|
|
|
|
pragma Warnings (Off, "aspect ""PRE"" not enforced on inlined subprogram");
|
|
procedure Encode
|
|
(Code : VSS.Unicode.Code_Point;
|
|
Length : out UTF8_Sequence_Length;
|
|
Unit_1 : out VSS.Unicode.UTF8_Code_Unit;
|
|
Unit_2 : out VSS.Unicode.UTF8_Code_Unit;
|
|
Unit_3 : out VSS.Unicode.UTF8_Code_Unit;
|
|
Unit_4 : out VSS.Unicode.UTF8_Code_Unit)
|
|
with Inline_Always, Pre => Code not in 16#D800# .. 16#DFFF#;
|
|
pragma Warnings (On, "aspect ""PRE"" not enforced on inlined subprogram");
|
|
-- Encode code point. Size is actual number of code units, U1 .. U4 values
|
|
-- of code units.
|
|
|
|
type UTF8_Decode_Error is
|
|
(None,
|
|
Incomplete_2,
|
|
Incomplete_3,
|
|
Incomplete_4,
|
|
Invalid_1,
|
|
Invalid_2_Of_2,
|
|
Invalid_2_Of_3,
|
|
Invalid_3_Of_3,
|
|
Invalid_2_Of_4,
|
|
Invalid_3_Of_4,
|
|
Invalid_4_Of_4);
|
|
|
|
procedure Decode
|
|
(Data : VSS.Stream_Element_Vectors.Stream_Element_Vector;
|
|
Index : in out Ada.Streams.Stream_Element_Count;
|
|
Code : out VSS.Unicode.Code_Point;
|
|
Success : in out Boolean;
|
|
Error : out UTF8_Decode_Error);
|
|
|
|
procedure Unchecked_Store
|
|
(Storage : in out VSS.Implementation.UTF8_Encoding.UTF8_Code_Unit_Array;
|
|
From : VSS.Unicode.UTF8_Code_Unit_Offset;
|
|
Length : VSS.Implementation.UTF8_Encoding.UTF8_Sequence_Length;
|
|
Unit_1 : VSS.Unicode.UTF8_Code_Unit;
|
|
Unit_2 : VSS.Unicode.UTF8_Code_Unit;
|
|
Unit_3 : VSS.Unicode.UTF8_Code_Unit;
|
|
Unit_4 : VSS.Unicode.UTF8_Code_Unit) with Inline_Always;
|
|
-- Store encoded character.
|
|
|
|
end VSS.Implementation.UTF8_Encoding;
|