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Comment:s_expressions-atom_buffers: add a stream interface to atom buffers
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: a209bfec77a9f91c191cc3ff91bc0d0fbec446e9
User & Date: nat on 2014-08-30 20:33:48
Other Links: manifest | tags
Context
2014-08-31
14:45
s_expressions-atom_buffers-tests: add a test for the new stream interface check-in: 3c45cf38af user: nat tags: trunk
2014-08-30
20:33
s_expressions-atom_buffers: add a stream interface to atom buffers check-in: a209bfec77 user: nat tags: trunk
2014-08-29
20:37
s_expressions-atom_buffers: rename Read procedure to Peek, to make room for stream primitives check-in: a2fd0fbfb6 user: nat tags: trunk
Changes
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Modified src/natools-s_expressions-atom_buffers.adb from [f4f287ab4e] to [34dcf49f16].

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   procedure Soft_Reset (Buffer : in out Atom_Buffer) is
   begin
      Buffer.Used := 0;
   end Soft_Reset;


   overriding procedure Write
     (Buffer : in out Atom_Buffer;
      Item : in Ada.Streams.Stream_Element_Array)
     renames Append;


   overriding procedure Read
     (Buffer : in out Atom_Buffer;
      Item : out Ada.Streams.Stream_Element_Array;
      Last : out Ada.Streams.Stream_Element_Offset) is
   begin
      if Item'Length < Buffer.Used then
         Last := Item'Last;
         Item := Buffer.Ref.Query.Data.all (1 .. Item'Length);
         Buffer.Used := Buffer.Used - Item'Length;
      else
         Last := Item'First + Buffer.Used - 1;
         Item (Item'First .. Last)
           := Buffer.Ref.Query.Data.all (1 .. Buffer.Used);
         Buffer.Used := 0;
      end if;
   end Read;

end Natools.S_Expressions.Atom_Buffers;

Modified src/natools-s_expressions-atom_buffers.ads from [940d53e029] to [6608c95221].

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------------------------------------------------------------------------------

with Natools.S_Expressions.Atom_Refs;

package Natools.S_Expressions.Atom_Buffers is
   pragma Preelaborate (Atom_Buffers);

   type Atom_Buffer is tagged limited private;
   type Atom_Buffer is new Ada.Streams.Root_Stream_Type with private;
   pragma Preelaborable_Initialization (Atom_Buffer);

   overriding procedure Write
     (Buffer : in out Atom_Buffer;
      Item : in Ada.Streams.Stream_Element_Array);
   overriding procedure Read
     (Buffer : in out Atom_Buffer;
      Item : out Ada.Streams.Stream_Element_Array;
      Last : out Ada.Streams.Stream_Element_Offset);

   procedure Preallocate (Buffer : in out Atom_Buffer; Length : in Count);
      --  Preallocate enough memory to append Length octets without
      --  any further allocation.

   procedure Append (Buffer : in out Atom_Buffer; Data : in Atom);
   procedure Append (Buffer : in out Atom_Buffer; Data : in Octet);
      --  Append Data after the end of Buffer
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      --  Clear buffer and release internal memory

   procedure Soft_Reset (Buffer : in out Atom_Buffer);
      --  Clear buffer keeping internal memory

private

   type Atom_Buffer is tagged limited record
   type Atom_Buffer is new Ada.Streams.Root_Stream_Type with record
      Ref : Atom_Refs.Reference;
      Available, Used : Count := 0;
   end record;

end Natools.S_Expressions.Atom_Buffers;

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