File : adagio-memory_stream_constrained.ads
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-- $Id: adagio-memory_stream_constrained.ads,v 1.3 2004/01/21 21:05:41 Jano Exp $
-- Allows reading from memory viewed as an stream:
with Ada.Streams; use Ada.Streams;
with System;
package Adagio.Memory_stream_constrained is
-- New stream type:
type Stream_type is new Ada.Streams.Root_Stream_Type with private;
-- Data should be the address of the first element.
-- Beware of alignment!!!!
-- Only valid for contiguous data (or if you known what you are doing).
procedure Create (
Stream : out Stream_type;
Data : System.Address;
Length : Natural);
procedure Read (
Stream : in out Stream_type;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset);
-- 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;
-- EOF
function End_of_stream (Stream : in Stream_type) return boolean;
private
subtype Big_array is
Stream_element_array (1 .. Stream_element_offset'Last);
type Array_access is access all Big_array;
type Stream_type is new Ada.Streams.Root_Stream_Type with record
Buffer : Array_access;
Pos : Stream_element_offset := 1;
Length : Stream_element_offset;
end record;
end Adagio.Memory_stream_constrained;