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+------------------------------------------------------------------------------
+-- ZLib for Ada thick binding. --
+-- --
+-- Copyright (C) 2002-2004 Dmitriy Anisimkov --
+-- --
+-- This library 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 library 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. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+------------------------------------------------------------------------------
+
+-- $Id: zlib.ads,v 1.26 2004/09/06 06:53:19 vagul Exp $
+
+with Ada.Streams;
+
+with Interfaces;
+
+package ZLib is
+
+ ZLib_Error : exception;
+ Status_Error : exception;
+
+ type Compression_Level is new Integer range -1 .. 9;
+
+ type Flush_Mode is private;
+
+ type Compression_Method is private;
+
+ type Window_Bits_Type is new Integer range 8 .. 15;
+
+ type Memory_Level_Type is new Integer range 1 .. 9;
+
+ type Unsigned_32 is new Interfaces.Unsigned_32;
+
+ type Strategy_Type is private;
+
+ type Header_Type is (None, Auto, Default, GZip);
+ -- Header type usage have a some limitation for inflate.
+ -- See comment for Inflate_Init.
+
+ subtype Count is Ada.Streams.Stream_Element_Count;
+
+ Default_Memory_Level : constant Memory_Level_Type := 8;
+ Default_Window_Bits : constant Window_Bits_Type := 15;
+
+ ----------------------------------
+ -- Compression method constants --
+ ----------------------------------
+
+ Deflated : constant Compression_Method;
+ -- Only one method allowed in this ZLib version
+
+ ---------------------------------
+ -- Compression level constants --
+ ---------------------------------
+
+ No_Compression : constant Compression_Level := 0;
+ Best_Speed : constant Compression_Level := 1;
+ Best_Compression : constant Compression_Level := 9;
+ Default_Compression : constant Compression_Level := -1;
+
+ --------------------------
+ -- Flush mode constants --
+ --------------------------
+
+ No_Flush : constant Flush_Mode;
+ -- Regular way for compression, no flush
+
+ Partial_Flush : constant Flush_Mode;
+ -- Will be removed, use Z_SYNC_FLUSH instead
+
+ Sync_Flush : constant Flush_Mode;
+ -- All pending output is flushed to the output buffer and the output
+ -- is aligned on a byte boundary, so that the decompressor can get all
+ -- input data available so far. (In particular avail_in is zero after the
+ -- call if enough output space has been provided before the call.)
+ -- Flushing may degrade compression for some compression algorithms and so
+ -- it should be used only when necessary.
+
+ Block_Flush : constant Flush_Mode;
+ -- Z_BLOCK requests that inflate() stop
+ -- if and when it get to the next deflate block boundary. When decoding the
+ -- zlib or gzip format, this will cause inflate() to return immediately
+ -- after the header and before the first block. When doing a raw inflate,
+ -- inflate() will go ahead and process the first block, and will return
+ -- when it gets to the end of that block, or when it runs out of data.
+
+ Full_Flush : constant Flush_Mode;
+ -- All output is flushed as with SYNC_FLUSH, and the compression state
+ -- is reset so that decompression can restart from this point if previous
+ -- compressed data has been damaged or if random access is desired. Using
+ -- Full_Flush too often can seriously degrade the compression.
+
+ Finish : constant Flush_Mode;
+ -- Just for tell the compressor that input data is complete.
+
+ ------------------------------------
+ -- Compression strategy constants --
+ ------------------------------------
+
+ -- RLE stategy could be used only in version 1.2.0 and later.
+
+ Filtered : constant Strategy_Type;
+ Huffman_Only : constant Strategy_Type;
+ RLE : constant Strategy_Type;
+ Default_Strategy : constant Strategy_Type;
+
+ Default_Buffer_Size : constant := 4096;
+
+ type Filter_Type is tagged limited private;
+ -- The filter is for compression and for decompression.
+ -- The usage of the type is depend of its initialization.
+
+ function Version return String;
+ pragma Inline (Version);
+ -- Return string representation of the ZLib version.
+
+ procedure Deflate_Init
+ (Filter : in out Filter_Type;
+ Level : in Compression_Level := Default_Compression;
+ Strategy : in Strategy_Type := Default_Strategy;
+ Method : in Compression_Method := Deflated;
+ Window_Bits : in Window_Bits_Type := Default_Window_Bits;
+ Memory_Level : in Memory_Level_Type := Default_Memory_Level;
+ Header : in Header_Type := Default);
+ -- Compressor initialization.
+ -- When Header parameter is Auto or Default, then default zlib header
+ -- would be provided for compressed data.
+ -- When Header is GZip, then gzip header would be set instead of
+ -- default header.
+ -- When Header is None, no header would be set for compressed data.
+
+ procedure Inflate_Init
+ (Filter : in out Filter_Type;
+ Window_Bits : in Window_Bits_Type := Default_Window_Bits;
+ Header : in Header_Type := Default);
+ -- Decompressor initialization.
+ -- Default header type mean that ZLib default header is expecting in the
+ -- input compressed stream.
+ -- Header type None mean that no header is expecting in the input stream.
+ -- GZip header type mean that GZip header is expecting in the
+ -- input compressed stream.
+ -- Auto header type mean that header type (GZip or Native) would be
+ -- detected automatically in the input stream.
+ -- Note that header types parameter values None, GZip and Auto are
+ -- supported for inflate routine only in ZLib versions 1.2.0.2 and later.
+ -- Deflate_Init is supporting all header types.
+
+ function Is_Open (Filter : in Filter_Type) return Boolean;
+ pragma Inline (Is_Open);
+ -- Is the filter opened for compression or decompression.
+
+ procedure Close
+ (Filter : in out Filter_Type;
+ Ignore_Error : in Boolean := False);
+ -- Closing the compression or decompressor.
+ -- If stream is closing before the complete and Ignore_Error is False,
+ -- The exception would be raised.
+
+ generic
+ with procedure Data_In
+ (Item : out Ada.Streams.Stream_Element_Array;
+ Last : out Ada.Streams.Stream_Element_Offset);
+ with procedure Data_Out
+ (Item : in Ada.Streams.Stream_Element_Array);
+ procedure Generic_Translate
+ (Filter : in out Filter_Type;
+ In_Buffer_Size : in Integer := Default_Buffer_Size;
+ Out_Buffer_Size : in Integer := Default_Buffer_Size);
+ -- Compress/decompress data fetch from Data_In routine and pass the result
+ -- to the Data_Out routine. User should provide Data_In and Data_Out
+ -- for compression/decompression data flow.
+ -- Compression or decompression depend on Filter initialization.
+
+ function Total_In (Filter : in Filter_Type) return Count;
+ pragma Inline (Total_In);
+ -- Returns total number of input bytes read so far
+
+ function Total_Out (Filter : in Filter_Type) return Count;
+ pragma Inline (Total_Out);
+ -- Returns total number of bytes output so far
+
+ function CRC32
+ (CRC : in Unsigned_32;
+ Data : in Ada.Streams.Stream_Element_Array)
+ return Unsigned_32;
+ pragma Inline (CRC32);
+ -- Compute CRC32, it could be necessary for make gzip format
+
+ procedure CRC32
+ (CRC : in out Unsigned_32;
+ Data : in Ada.Streams.Stream_Element_Array);
+ pragma Inline (CRC32);
+ -- Compute CRC32, it could be necessary for make gzip format
+
+ -------------------------------------------------
+ -- Below is more complex low level routines. --
+ -------------------------------------------------
+
+ procedure Translate
+ (Filter : in out Filter_Type;
+ In_Data : in Ada.Streams.Stream_Element_Array;
+ In_Last : out Ada.Streams.Stream_Element_Offset;
+ Out_Data : out Ada.Streams.Stream_Element_Array;
+ Out_Last : out Ada.Streams.Stream_Element_Offset;
+ Flush : in Flush_Mode);
+ -- Compress/decompress the In_Data buffer and place the result into
+ -- Out_Data. In_Last is the index of last element from In_Data accepted by
+ -- the Filter. Out_Last is the last element of the received data from
+ -- Filter. To tell the filter that incoming data are complete put the
+ -- Flush parameter to Finish.
+
+ function Stream_End (Filter : in Filter_Type) return Boolean;
+ pragma Inline (Stream_End);
+ -- Return the true when the stream is complete.
+
+ procedure Flush
+ (Filter : in out Filter_Type;
+ Out_Data : out Ada.Streams.Stream_Element_Array;
+ Out_Last : out Ada.Streams.Stream_Element_Offset;
+ Flush : in Flush_Mode);
+ pragma Inline (Flush);
+ -- Flushing the data from the compressor.
+
+ generic
+ with procedure Write
+ (Item : in Ada.Streams.Stream_Element_Array);
+ -- User should provide this routine for accept
+ -- compressed/decompressed data.
+
+ Buffer_Size : in Ada.Streams.Stream_Element_Offset
+ := Default_Buffer_Size;
+ -- Buffer size for Write user routine.
+
+ procedure Write
+ (Filter : in out Filter_Type;
+ Item : in Ada.Streams.Stream_Element_Array;
+ Flush : in Flush_Mode := No_Flush);
+ -- Compress/Decompress data from Item to the generic parameter procedure
+ -- Write. Output buffer size could be set in Buffer_Size generic parameter.
+
+ generic
+ with procedure Read
+ (Item : out Ada.Streams.Stream_Element_Array;
+ Last : out Ada.Streams.Stream_Element_Offset);
+ -- User should provide data for compression/decompression
+ -- thru this routine.
+
+ Buffer : in out Ada.Streams.Stream_Element_Array;
+ -- Buffer for keep remaining data from the previous
+ -- back read.
+
+ Rest_First, Rest_Last : in out Ada.Streams.Stream_Element_Offset;
+ -- Rest_First have to be initialized to Buffer'Last + 1
+ -- Rest_Last have to be initialized to Buffer'Last
+ -- before usage.
+
+ Allow_Read_Some : in Boolean := False;
+ -- Is it allowed to return Last < Item'Last before end of data.
+
+ procedure Read
+ (Filter : in out Filter_Type;
+ Item : out Ada.Streams.Stream_Element_Array;
+ Last : out Ada.Streams.Stream_Element_Offset;
+ Flush : in Flush_Mode := No_Flush);
+ -- Compress/Decompress data from generic parameter procedure Read to the
+ -- Item. User should provide Buffer and initialized Rest_First, Rest_Last
+ -- indicators. If Allow_Read_Some is True, Read routines could return
+ -- Last < Item'Last only at end of stream.
+
+private
+
+ use Ada.Streams;
+
+ pragma Assert (Ada.Streams.Stream_Element'Size = 8);
+ pragma Assert (Ada.Streams.Stream_Element'Modulus = 2**8);
+
+ type Flush_Mode is new Integer range 0 .. 5;
+
+ type Compression_Method is new Integer range 8 .. 8;
+
+ type Strategy_Type is new Integer range 0 .. 3;
+
+ No_Flush : constant Flush_Mode := 0;
+ Partial_Flush : constant Flush_Mode := 1;
+ Sync_Flush : constant Flush_Mode := 2;
+ Full_Flush : constant Flush_Mode := 3;
+ Finish : constant Flush_Mode := 4;
+ Block_Flush : constant Flush_Mode := 5;
+
+ Filtered : constant Strategy_Type := 1;
+ Huffman_Only : constant Strategy_Type := 2;
+ RLE : constant Strategy_Type := 3;
+ Default_Strategy : constant Strategy_Type := 0;
+
+ Deflated : constant Compression_Method := 8;
+
+ type Z_Stream;
+
+ type Z_Stream_Access is access all Z_Stream;
+
+ type Filter_Type is tagged limited record
+ Strm : Z_Stream_Access;
+ Compression : Boolean;
+ Stream_End : Boolean;
+ Header : Header_Type;
+ CRC : Unsigned_32;
+ Offset : Stream_Element_Offset;
+ -- Offset for gzip header/footer output.
+ end record;
+
+end ZLib;