File : adagio-memory_stream_unconstrained.adb
------------------------------------------------------------------------------
-- ADAGIO - ADALID - AENEA. --
-- --
-- Copyright (C) 2003 --
-- A. Mosteo. --
-- --
-- Authors: A. Mosteo. (adagio@mosteo.com) --
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-- This program is free software; you can redistribute it and/or modify --
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-- This program is distributed in the hope that it will be useful, but --
-- WITHOUT ANY WARRANTY; without even the implied warranty of --
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-- General Public License for more details. --
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------------------------------------------------------------------------------
-- $Id: adagio-memory_stream_unconstrained.adb,v 1.3 2004/01/21 21:05:41 Jano Exp $
-- Allows reading from a string viewed as an stream:
package body Adagio.Memory_stream_unconstrained is
------------------------------------------------------------------------
-- Read --
------------------------------------------------------------------------
procedure Read (
Stream : in out Stream_type;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset) is
Pos : Stream_element_offset renames Stream.Pos;
begin
if Pos > STream.Data'Last then
raise Constraint_error;
end if;
if Item'Length > Stream.Data'Last - Pos + 1 then
Item (Item'First .. Item'First + Stream.Data'Last - Pos) :=
Stream.Data (Pos .. Stream.Data'Last);
Last := Item'First + Stream.Data'Last - Pos;
Pos := Stream.Data'Last + 1;
else
Item := Stream.Data (Pos .. Pos + Item'Length - 1);
Last := Item'Last;
Pos := Pos + Item'Length;
end if;
end Read;
------------------------------------------------------------------------
-- Write --
------------------------------------------------------------------------
procedure Write (
Stream : in out Stream_type;
Item : in Stream_Element_Array) is
Pos : Stream_element_offset renames Stream.Pos;
begin
if Pos + Item'Length - 1 > Stream.Data'Length then
raise Constraint_error;
end if;
Stream.Data (Pos .. Pos + Item'Length - 1) := Item;
Pos := Pos + Item'Length;
end Write;
------------------------------------------------------------------------
-- Index --
------------------------------------------------------------------------
function Index (Stream : in Stream_type) return Stream_element_offset is
begin
return Stream.Pos - Stream.Data'First;
end Index;
------------------------------------------------------------------------
-- Set_index --
------------------------------------------------------------------------
-- Set starting position for read/write (First is 1)
procedure Set_index (
Stream : in out Stream_type;
Index : in Stream_element_offset) is
begin
Stream.Pos := Stream.Data'First + Index - 1;
end Set_index;
------------------------------------------------------------------------
-- End_of_stream --
------------------------------------------------------------------------
function End_of_stream (Stream : in Stream_type) return boolean is
begin
return Stream.Pos > Stream.Data.all'Last;
end End_of_stream;
end Adagio.Memory_stream_unconstrained;