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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . B Y T E _ S W A P P I N G --
-- --
-- B o d y --
-- --
-- Copyright (C) 2006-2012, 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 3, 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. --
-- --
-- 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is a general implementation that uses GCC intrinsics to take
-- advantage of any machine-specific instructions.
with Ada.Unchecked_Conversion; use Ada;
with System.Byte_Swapping; use System.Byte_Swapping;
package body GNAT.Byte_Swapping is
--------------
-- Swapped2 --
--------------
function Swapped2 (Input : Item) return Item is
function As_U16 is new Unchecked_Conversion (Item, U16);
function As_Item is new Unchecked_Conversion (U16, Item);
pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 2,
"storage size must be 2 bytes");
begin
return As_Item (Bswap_16 (As_U16 (Input)));
end Swapped2;
--------------
-- Swapped4 --
--------------
function Swapped4 (Input : Item) return Item is
function As_U32 is new Unchecked_Conversion (Item, U32);
function As_Item is new Unchecked_Conversion (U32, Item);
pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 4,
"storage size must be 4 bytes");
begin
return As_Item (Bswap_32 (As_U32 (Input)));
end Swapped4;
--------------
-- Swapped8 --
--------------
function Swapped8 (Input : Item) return Item is
function As_U64 is new Unchecked_Conversion (Item, U64);
function As_Item is new Unchecked_Conversion (U64, Item);
pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 8,
"storage size must be 8 bytes");
begin
return As_Item (Bswap_64 (As_U64 (Input)));
end Swapped8;
-----------
-- Swap2 --
-----------
procedure Swap2 (Location : System.Address) is
X : U16;
for X'Address use Location;
begin
X := Bswap_16 (X);
end Swap2;
-----------
-- Swap4 --
-----------
procedure Swap4 (Location : System.Address) is
X : U32;
for X'Address use Location;
begin
X := Bswap_32 (X);
end Swap4;
-----------
-- Swap8 --
-----------
procedure Swap8 (Location : System.Address) is
X : U64;
for X'Address use Location;
begin
X := Bswap_64 (X);
end Swap8;
end GNAT.Byte_Swapping;
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