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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . E N C O D E _ S T R I N G --
-- --
-- S p e c --
-- --
-- Copyright (C) 2007-2008, AdaCore --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT 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 distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This generic package provides utility routines for converting from
-- Wide_String or Wide_Wide_String to encoded String using a specified
-- encoding convention, which is supplied as the generic parameter. If
-- this parameter is a known at compile time constant (e.g. a constant
-- defined in System.WCh_Con), the instantiation is specialized so that
-- it applies only to this specified coding.
-- Note: this package is only about encoding sequences of 16- or 32-bit
-- characters into a sequence of 8-bit codes. It knows nothing at all about
-- the character encodings being used for the input Wide_Character and
-- Wide_Wide_Character values, although some of the encoding methods (notably
-- JIS and EUC) have built in assumptions about the range of possible input
-- code values. Most often the input will be Unicode/ISO-10646 as specified by
-- the Ada RM, but this package does not make any assumptions about the
-- character coding, and in the case of UTF-8 all possible code values can be
-- encoded. See also the packages Ada.Wide_[Wide_]Characters.Unicode for
-- unicode specific functions.
-- Note on brackets encoding (WCEM_Brackets). On input, upper half characters
-- can be represented as ["hh"] but the routines in this package will only use
-- brackets encodings for codes higher than 16#FF#, so upper half characters
-- will be output as single Character values.
with System.WCh_Con;
generic
Encoding_Method : System.WCh_Con.WC_Encoding_Method;
package GNAT.Encode_String is
pragma Pure;
function Encode_Wide_String (S : Wide_String) return String;
pragma Inline (Encode_Wide_String);
-- Encode the given Wide_String, returning a String encoded using the
-- given encoding method. Constraint_Error will be raised if the encoding
-- method cannot accommodate the input data.
procedure Encode_Wide_String
(S : Wide_String;
Result : out String;
Length : out Natural);
-- Encode the given Wide_String, storing the encoded string in Result,
-- with Length being set to the length of the encoded string. The caller
-- must ensure that Result is long enough (see useful constants defined
-- in System.WCh_Con: WC_Longest_Sequence, WC_Longest_Sequences). If the
-- length of Result is insufficient Constraint_Error will be raised.
-- Constraint_Error will also be raised if the encoding method cannot
-- accommodate the input data.
function Encode_Wide_Wide_String (S : Wide_Wide_String) return String;
pragma Inline (Encode_Wide_Wide_String);
-- Same as above function but for Wide_Wide_String input
procedure Encode_Wide_Wide_String
(S : Wide_Wide_String;
Result : out String;
Length : out Natural);
-- Same as above procedure, but for Wide_Wide_String input
procedure Encode_Wide_Character
(Char : Wide_Character;
Result : in out String;
Ptr : in out Natural);
pragma Inline (Encode_Wide_Character);
-- This is a lower level procedure that encodes the single character Char.
-- The output is stored in Result starting at Result (Ptr), and Ptr is
-- updated past the stored value. Constraint_Error is raised if Result
-- is not long enough to accommodate the result, or if the encoding method
-- specified does not accommodate the input character value, or if Ptr is
-- outside the bounds of the Result string.
procedure Encode_Wide_Wide_Character
(Char : Wide_Wide_Character;
Result : in out String;
Ptr : in out Natural);
-- Same as above procedure but with Wide_Wide_Character input
end GNAT.Encode_String;
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