File : adagio-memory_stream_unconstrained.ads
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-- ADAGIO - ADALID - AENEA. --
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-- Copyright (C) 2003 --
-- A. Mosteo. --
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-- Authors: A. Mosteo. (adagio@mosteo.com) --
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-- $Id: adagio-memory_stream_unconstrained.ads,v 1.3 2004/01/21 21:05:41 Jano Exp $
-- Allows reading from a string viewed as an stream:
with Ada.Streams; use Ada.Streams;
package Adagio.Memory_stream_unconstrained is
-- New stream type:
-- Takes an access to an element array. It should remain allocated
-- during the life of this stream.
-- It will not be deallocated
type Stream_type (
Data : access Stream_element_array) is new
Ada.Streams.Root_Stream_Type with private;
type Stream_access is access all Stream_type;
------------------------------------------------------------------------
-- Read --
------------------------------------------------------------------------
procedure Read (
Stream : in out Stream_type;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset);
------------------------------------------------------------------------
-- Write --
------------------------------------------------------------------------
-- Can cause constraint_error if the supplied buffer is exhausted.
procedure Write (
Stream : in out Stream_type;
Item : in Stream_Element_Array);
------------------------------------------------------------------------
-- Index --
------------------------------------------------------------------------
-- Amount of data written / read.
function Index (Stream : in Stream_type) return Stream_element_offset;
------------------------------------------------------------------------
-- Set_index --
------------------------------------------------------------------------
-- Set starting position for read/write (First is 1)
procedure Set_index (
Stream : in out Stream_type;
Index : in Stream_element_offset);
------------------------------------------------------------------------
-- End_of_stream --
------------------------------------------------------------------------
function End_of_stream (Stream : in Stream_type) return boolean;
private
type Stream_type (
Data : access Stream_element_array) is new Ada.Streams.Root_Stream_Type
with record
Pos : Stream_element_offset := Data.all'First;
end record;
end Adagio.Memory_stream_unconstrained;