2007-12-06 Robert Dewar <dewar@adacore.com>

	* g-byorma.adb, g-byorma.ads, g-decstr.adb, g-decstr.ads,
	g-deutst.ads, g-encstr.adb, g-encstr.ads, g-enutst.ads: New files.

	* scn.adb: Implement BOM recognition


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@130849 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 111 insertions, 0 deletions

diff --git a/gcc/ada/g-encstr.ads b/gcc/ada/g-encstr.ads
new file mode 100755
index 00000000000..5862bbe182d
--- /dev/null
+++ b/gcc/ada/g-encstr.ads
@@ -0,0 +1,111 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         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, 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
+--  definned 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 accomodate 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
+   --  accomodate 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 accomodate the result, or if the encoding method
+   --  specified does not accomodate 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;