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146 | -- Abstract:
--
-- see spec
--
-- Copyright (C) 2005, 2009, 2018 Stephen Leake. All Rights Reserved.
--
-- This library is free software; you can redistribute it and/or
-- modify it under terms of the GNU General Public License as
-- published by the Free Software Foundation; either version 3, or (at
-- your option) any later version. This library is distributed in the
-- hope that it will be useful, but WITHOUT 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 this program; see file COPYING. If not, write to
-- the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
-- MA 02111-1307, 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.
pragma License (Modified_GPL);
with Ada.IO_Exceptions;
with System.Address_To_Access_Conversions;
with System.Storage_Elements;
package body SAL.Memory_Streams is
procedure Create (Stream : in out Stream_Type)
is begin
Stream.Last := 0;
Stream.Direction := Out_Stream;
end Create;
procedure Create
(Stream : in out Stream_Type;
Data : in Ada.Streams.Stream_Element_Array)
is begin
Stream.Raw (1 .. Data'Length) := Data;
Stream.Last := 0;
Stream.Direction := In_Stream;
end Create;
package Stream_Element_Address_Conversions is new System.Address_To_Access_Conversions (Ada.Streams.Stream_Element);
procedure Create
(Stream : in out Stream_Type;
Address : in System.Address)
is
function "+"
(Left : System.Address;
Right : System.Storage_Elements.Storage_Offset)
return System.Address renames System.Storage_Elements."+";
Temp : System.Address := Address;
begin
for I in Stream.Raw'Range loop
Stream.Raw (I) := Stream_Element_Address_Conversions.To_Pointer (Temp).all;
Temp := Temp + 1;
end loop;
Stream.Direction := In_Stream;
Stream.Last := 0;
end Create;
procedure Reset (Stream : in out Stream_Type)
is begin
Stream.Last := 0;
end Reset;
function Length (Stream : in Stream_Type) return Ada.Streams.Stream_Element_Count
is
use all type Ada.Streams.Stream_Element_Offset;
begin
case Stream.Direction is
when In_Stream =>
return Stream.Raw'Last - Stream.Last;
when Out_Stream =>
return Stream.Last;
end case;
end Length;
function Address (Stream : in Stream_Type) return System.Address
is begin
case Stream.Direction is
when In_Stream =>
raise Ada.IO_Exceptions.Status_Error;
when Out_Stream =>
return Stream.Raw (1)'Address;
end case;
end Address;
overriding procedure Read
(Stream : in out Stream_Type;
Item : out Ada.Streams.Stream_Element_Array;
Last : out Ada.Streams.Stream_Element_Offset)
is
use all type Ada.Streams.Stream_Element_Offset;
begin
case Stream.Direction is
when In_Stream =>
declare
Remaining : constant Ada.Streams.Stream_Element_Offset := Stream.Raw'Last - Stream.Last;
begin
if Remaining >= Item'Length then
Item := Stream.Raw (Stream.Last + 1 .. Stream.Last + Item'Length);
Stream.Last := Stream.Last + Item'Length;
Last := Item'Last;
else
Last := Item'First + Remaining - 1;
Item (Item'First .. Last) := Stream.Raw (Stream.Last + 1 .. Stream.Raw'Last);
Stream.Last := Stream.Raw'Last;
end if;
end;
when Out_Stream =>
raise Ada.IO_Exceptions.Status_Error;
end case;
end Read;
overriding procedure Write
(Stream : in out Stream_Type;
Item : in Ada.Streams.Stream_Element_Array)
is
use all type Ada.Streams.Stream_Element_Offset;
begin
case Stream.Direction is
when In_Stream =>
raise Ada.IO_Exceptions.Status_Error;
when Out_Stream =>
declare
Remaining : constant Ada.Streams.Stream_Element_Offset := Stream.Raw'Last - Stream.Last;
begin
if Remaining >= Item'Length then
Stream.Raw (Stream.Last + 1 .. Stream.Last + Item'Length) := Item;
Stream.Last := Stream.Last + Item'Length;
else
raise Ada.IO_Exceptions.End_Error;
end if;
end;
end case;
end Write;
end SAL.Memory_Streams;
|