114 lines
4.4 KiB
Ada
114 lines
4.4 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- G N A T . B Y T E _ S W A P P I N G --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2006-2012, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is a general implementation that uses GCC intrinsics to take
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-- advantage of any machine-specific instructions.
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with Ada.Unchecked_Conversion; use Ada;
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with System.Byte_Swapping; use System.Byte_Swapping;
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package body GNAT.Byte_Swapping is
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--------------
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-- Swapped2 --
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--------------
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function Swapped2 (Input : Item) return Item is
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function As_U16 is new Unchecked_Conversion (Item, U16);
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function As_Item is new Unchecked_Conversion (U16, Item);
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pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 2,
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"storage size must be 2 bytes");
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begin
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return As_Item (Bswap_16 (As_U16 (Input)));
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end Swapped2;
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--------------
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-- Swapped4 --
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--------------
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function Swapped4 (Input : Item) return Item is
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function As_U32 is new Unchecked_Conversion (Item, U32);
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function As_Item is new Unchecked_Conversion (U32, Item);
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pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 4,
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"storage size must be 4 bytes");
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begin
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return As_Item (Bswap_32 (As_U32 (Input)));
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end Swapped4;
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--------------
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-- Swapped8 --
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--------------
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function Swapped8 (Input : Item) return Item is
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function As_U64 is new Unchecked_Conversion (Item, U64);
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function As_Item is new Unchecked_Conversion (U64, Item);
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pragma Compile_Time_Error (Item'Max_Size_In_Storage_Elements /= 8,
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"storage size must be 8 bytes");
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begin
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return As_Item (Bswap_64 (As_U64 (Input)));
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end Swapped8;
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-----------
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-- Swap2 --
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-----------
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procedure Swap2 (Location : System.Address) is
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X : U16;
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for X'Address use Location;
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begin
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X := Bswap_16 (X);
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end Swap2;
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-----------
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-- Swap4 --
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-----------
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procedure Swap4 (Location : System.Address) is
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X : U32;
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for X'Address use Location;
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begin
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X := Bswap_32 (X);
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end Swap4;
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-----------
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-- Swap8 --
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-----------
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procedure Swap8 (Location : System.Address) is
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X : U64;
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for X'Address use Location;
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begin
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X := Bswap_64 (X);
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end Swap8;
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end GNAT.Byte_Swapping;
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