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Diffstat (limited to 'zlib/contrib/ada/zlib-streams.adb')
| -rw-r--r-- | zlib/contrib/ada/zlib-streams.adb | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/zlib/contrib/ada/zlib-streams.adb b/zlib/contrib/ada/zlib-streams.adb new file mode 100644 index 000000000..b6497bae2 --- /dev/null +++ b/zlib/contrib/ada/zlib-streams.adb @@ -0,0 +1,225 @@ +---------------------------------------------------------------- +-- ZLib for Ada thick binding. -- +-- -- +-- Copyright (C) 2002-2003 Dmitriy Anisimkov -- +-- -- +-- Open source license information is in the zlib.ads file. -- +---------------------------------------------------------------- + +-- $Id: zlib-streams.adb,v 1.10 2004/05/31 10:53:40 vagul Exp $ + +with Ada.Unchecked_Deallocation; + +package body ZLib.Streams is + + ----------- + -- Close -- + ----------- + + procedure Close (Stream : in out Stream_Type) is + procedure Free is new Ada.Unchecked_Deallocation + (Stream_Element_Array, Buffer_Access); + begin + if Stream.Mode = Out_Stream or Stream.Mode = Duplex then + -- We should flush the data written by the writer. + + Flush (Stream, Finish); + + Close (Stream.Writer); + end if; + + if Stream.Mode = In_Stream or Stream.Mode = Duplex then + Close (Stream.Reader); + Free (Stream.Buffer); + end if; + end Close; + + ------------ + -- Create -- + ------------ + + procedure Create + (Stream : out Stream_Type; + Mode : in Stream_Mode; + Back : in Stream_Access; + Back_Compressed : in Boolean; + Level : in Compression_Level := Default_Compression; + Strategy : in Strategy_Type := Default_Strategy; + Header : in Header_Type := Default; + Read_Buffer_Size : in Ada.Streams.Stream_Element_Offset + := Default_Buffer_Size; + Write_Buffer_Size : in Ada.Streams.Stream_Element_Offset + := Default_Buffer_Size) + is + + subtype Buffer_Subtype is Stream_Element_Array (1 .. Read_Buffer_Size); + + procedure Init_Filter + (Filter : in out Filter_Type; + Compress : in Boolean); + + ----------------- + -- Init_Filter -- + ----------------- + + procedure Init_Filter + (Filter : in out Filter_Type; + Compress : in Boolean) is + begin + if Compress then + Deflate_Init + (Filter, Level, Strategy, Header => Header); + else + Inflate_Init (Filter, Header => Header); + end if; + end Init_Filter; + + begin + Stream.Back := Back; + Stream.Mode := Mode; + + if Mode = Out_Stream or Mode = Duplex then + Init_Filter (Stream.Writer, Back_Compressed); + Stream.Buffer_Size := Write_Buffer_Size; + else + Stream.Buffer_Size := 0; + end if; + + if Mode = In_Stream or Mode = Duplex then + Init_Filter (Stream.Reader, not Back_Compressed); + + Stream.Buffer := new Buffer_Subtype; + Stream.Rest_First := Stream.Buffer'Last + 1; + Stream.Rest_Last := Stream.Buffer'Last; + end if; + end Create; + + ----------- + -- Flush -- + ----------- + + procedure Flush + (Stream : in out Stream_Type; + Mode : in Flush_Mode := Sync_Flush) + is + Buffer : Stream_Element_Array (1 .. Stream.Buffer_Size); + Last : Stream_Element_Offset; + begin + loop + Flush (Stream.Writer, Buffer, Last, Mode); + + Ada.Streams.Write (Stream.Back.all, Buffer (1 .. Last)); + + exit when Last < Buffer'Last; + end loop; + end Flush; + + ------------- + -- Is_Open -- + ------------- + + function Is_Open (Stream : Stream_Type) return Boolean is + begin + return Is_Open (Stream.Reader) or else Is_Open (Stream.Writer); + end Is_Open; + + ---------- + -- Read -- + ---------- + + procedure Read + (Stream : in out Stream_Type; + Item : out Stream_Element_Array; + Last : out Stream_Element_Offset) + is + + procedure Read + (Item : out Stream_Element_Array; + Last : out Stream_Element_Offset); + + ---------- + -- Read -- + ---------- + + procedure Read + (Item : out Stream_Element_Array; + Last : out Stream_Element_Offset) is + begin + Ada.Streams.Read (Stream.Back.all, Item, Last); + end Read; + + procedure Read is new ZLib.Read + (Read => Read, + Buffer => Stream.Buffer.all, + Rest_First => Stream.Rest_First, + Rest_Last => Stream.Rest_Last); + + begin + Read (Stream.Reader, Item, Last); + end Read; + + ------------------- + -- Read_Total_In -- + ------------------- + + function Read_Total_In (Stream : in Stream_Type) return Count is + begin + return Total_In (Stream.Reader); + end Read_Total_In; + + -------------------- + -- Read_Total_Out -- + -------------------- + + function Read_Total_Out (Stream : in Stream_Type) return Count is + begin + return Total_Out (Stream.Reader); + end Read_Total_Out; + + ----------- + -- Write -- + ----------- + + procedure Write + (Stream : in out Stream_Type; + Item : in Stream_Element_Array) + is + + procedure Write (Item : in Stream_Element_Array); + + ----------- + -- Write -- + ----------- + + procedure Write (Item : in Stream_Element_Array) is + begin + Ada.Streams.Write (Stream.Back.all, Item); + end Write; + + procedure Write is new ZLib.Write + (Write => Write, + Buffer_Size => Stream.Buffer_Size); + + begin + Write (Stream.Writer, Item, No_Flush); + end Write; + + -------------------- + -- Write_Total_In -- + -------------------- + + function Write_Total_In (Stream : in Stream_Type) return Count is + begin + return Total_In (Stream.Writer); + end Write_Total_In; + + --------------------- + -- Write_Total_Out -- + --------------------- + + function Write_Total_Out (Stream : in Stream_Type) return Count is + begin + return Total_Out (Stream.Writer); + end Write_Total_Out; + +end ZLib.Streams; |