| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
