File : adagio-zutil.adb
------------------------------------------------------------------------------
-- ADAGIO - ADALID - AENEA. --
-- --
-- Copyright (C) 2003 --
-- A. Mosteo. --
-- --
-- Authors: A. Mosteo. (adagio@mosteo.com) --
-- --
-- If you have any questions in regard to this software, please address --
-- them to the above email. --
-- --
-- This program is free software; you can redistribute it and/or modify --
-- it under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, or (at --
-- your option) any later version. --
-- --
-- This program is distributed in the hope that it will be useful, but --
-- WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. --
-- --
-- You should have received a copy of the GNU General Public License --
-- along with this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- You are not allowed to use any part of this code to develop a program --
-- whose output would be used to harass or prosecute other users of the --
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------------------------------------------------------------------------------
-- $Id: adagio-zutil.adb,v 1.3 2004/01/21 21:05:43 Jano Exp $
with Ada.Streams; use Ada.Streams;
package body Adagio.Zutil is
------------------------------------------------------------------------
-- Inflate --
------------------------------------------------------------------------
-- Well try to translate inbound data, and if not enough resulting space,
-- iteratively will increase the result buffer.
function Inflate (
this : in Stream_element_array;
Max_size : in Stream_element_offset := Max_Initial_Size)
return Stream_element_array is
Z : Zlib.Filter_type;
Result : Stream_element_array (1 .. Max_size);
Last_in : Stream_element_offset;
Last_out : Stream_element_offset;
begin
Zlib.Inflate_init (Z);
Zlib.Translate (Z, this, Last_in, Result, Last_out, Zlib.Finish);
if Last_out = Result'Last then
Zlib.Close (Z);
return Inflate (this, Max_size + Increment_Size);
else
Zlib.Close (Z);
return Result (1 .. Last_out);
end if;
end Inflate;
------------------------------------------------------------------------
-- Deflate --
------------------------------------------------------------------------
function Deflate (this : in Stream_element_array)
return Stream_element_array is
Z : Zlib.Filter_type;
Result : Stream_element_array (this'Range);
Last_in : Stream_element_offset;
Last_out : Stream_element_offset;
begin
Zlib.Deflate_init (Z);
Zlib.Translate (Z, this, Last_in, Result, Last_out, Zlib.Finish);
if Last_out = Result'Last then
raise Cannot_deflate;
return this;
else
Zlib.Close (Z);
return Result (1 .. Last_out);
end if;
exception
when others =>
Zlib.Close (Z);
raise;
end Deflate;
procedure Deflate (
From : in Stream_element_array;
To : in out Stream_element_array;
Last : out Stream_element_offset)
is
Z : Zlib.Filter_type;
Last_in : Stream_element_offset;
begin
Zlib.Deflate_init (Z);
Zlib.Translate (Z, From, Last_in, To, Last, Zlib.Finish);
if Last = To'Last then
raise Cannot_deflate;
else
Zlib.Close (Z);
end if;
exception
when others =>
Zlib.Close (Z);
raise;
end Deflate;
end Adagio.Zutil;