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-- $Date: 2004/03/04 04:46:00 $
-- $Revision: 1.1 $
-- $Author: jcrocholl $
with Interfaces; use Interfaces;
with Ada.Streams.Stream_IO; use Ada.Streams.Stream_IO;
package Bit_Buffers is
-- A buffer for an array of bits.
type Bit_Buffer(Byte_Count : Positive) is limited private;
-- Access type.
type Bit_Buffer_Access is access Bit_Buffer;
-- Create a bit buffer with a capacity of 8 * Byte_Count bits.
function Create
(Byte_Count : in Positive) -- The number of bytes in the buffer.
return Bit_Buffer_Access; -- The newly created bit buffer.
-- Free the bit buffer's memory and set the instance variable to
-- null.
procedure Deallocate
(This : in out Bit_Buffer_Access); -- Free this bit buffer.
-- Restart reading from the left of the bit buffer.
procedure Reset
(This : access Bit_Buffer); -- Reset this bit buffer.
-- Set all bits in this bit buffer to False.
procedure Clear
(This : access Bit_Buffer); -- Clear this bit buffer.
-- Fill the bit buffer with data from a stream.
procedure Read_Row
(From : in Stream_Access; -- Read from this stream.
This : access Bit_Buffer); -- Read data into this bit buffer.
-- Read the next bit from the bit buffer and advance the bit pointer.
function Read_Bit
(This : access Bit_Buffer) -- Read from this bit buffer.
return Boolean; -- The resulting bit value.
private
-- Smallest storage unit.
subtype Byte is Unsigned_8;
-- A buffer for bit data.
type Byte_Array is array (Positive range <>) of Byte;
-- Record for bit data and pointers.
type Bit_Buffer(Byte_Count : Positive) is record
Bytes : Byte_Array(1 .. Byte_Count);
Temp : Byte; -- The byte that is currently being processed.
Temp_Bits : Natural; -- The number of unread bits in Temp.
Temp_Index : Natural; -- The position of Temp in Bytes.
end record;
end Bit_Buffers;