| 1 | ----------------------------------------------------------------
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| 2 | -- ZLib for Ada thick binding. --
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| 3 | -- --
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| 4 | -- Copyright (C) 2002-2004 Dmitriy Anisimkov --
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| 5 | -- --
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| 6 | -- Open source license information is in the zlib.ads file. --
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| 7 | ----------------------------------------------------------------
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| 8 |
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| 9 | -- $Id: zlib.adb 40354 2012-03-05 13:39:00Z vboxsync $
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| 10 |
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| 11 | with Ada.Exceptions;
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| 12 | with Ada.Unchecked_Conversion;
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| 13 | with Ada.Unchecked_Deallocation;
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| 14 |
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| 15 | with Interfaces.C.Strings;
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| 16 |
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| 17 | with ZLib.Thin;
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| 18 |
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| 19 | package body ZLib is
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| 20 |
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| 21 | use type Thin.Int;
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| 22 |
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| 23 | type Z_Stream is new Thin.Z_Stream;
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| 24 |
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| 25 | type Return_Code_Enum is
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| 26 | (OK,
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| 27 | STREAM_END,
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| 28 | NEED_DICT,
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| 29 | ERRNO,
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| 30 | STREAM_ERROR,
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| 31 | DATA_ERROR,
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| 32 | MEM_ERROR,
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| 33 | BUF_ERROR,
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| 34 | VERSION_ERROR);
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| 35 |
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| 36 | type Flate_Step_Function is access
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| 37 | function (Strm : in Thin.Z_Streamp; Flush : in Thin.Int) return Thin.Int;
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| 38 | pragma Convention (C, Flate_Step_Function);
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| 39 |
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| 40 | type Flate_End_Function is access
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| 41 | function (Ctrm : in Thin.Z_Streamp) return Thin.Int;
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| 42 | pragma Convention (C, Flate_End_Function);
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| 43 |
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| 44 | type Flate_Type is record
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| 45 | Step : Flate_Step_Function;
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| 46 | Done : Flate_End_Function;
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| 47 | end record;
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| 48 |
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| 49 | subtype Footer_Array is Stream_Element_Array (1 .. 8);
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| 50 |
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| 51 | Simple_GZip_Header : constant Stream_Element_Array (1 .. 10)
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| 52 | := (16#1f#, 16#8b#, -- Magic header
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| 53 | 16#08#, -- Z_DEFLATED
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| 54 | 16#00#, -- Flags
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| 55 | 16#00#, 16#00#, 16#00#, 16#00#, -- Time
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| 56 | 16#00#, -- XFlags
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| 57 | 16#03# -- OS code
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| 58 | );
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| 59 | -- The simplest gzip header is not for informational, but just for
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| 60 | -- gzip format compatibility.
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| 61 | -- Note that some code below is using assumption
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| 62 | -- Simple_GZip_Header'Last > Footer_Array'Last, so do not make
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| 63 | -- Simple_GZip_Header'Last <= Footer_Array'Last.
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| 64 |
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| 65 | Return_Code : constant array (Thin.Int range <>) of Return_Code_Enum
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| 66 | := (0 => OK,
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| 67 | 1 => STREAM_END,
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| 68 | 2 => NEED_DICT,
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| 69 | -1 => ERRNO,
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| 70 | -2 => STREAM_ERROR,
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| 71 | -3 => DATA_ERROR,
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| 72 | -4 => MEM_ERROR,
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| 73 | -5 => BUF_ERROR,
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| 74 | -6 => VERSION_ERROR);
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| 75 |
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| 76 | Flate : constant array (Boolean) of Flate_Type
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| 77 | := (True => (Step => Thin.Deflate'Access,
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| 78 | Done => Thin.DeflateEnd'Access),
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| 79 | False => (Step => Thin.Inflate'Access,
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| 80 | Done => Thin.InflateEnd'Access));
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| 81 |
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| 82 | Flush_Finish : constant array (Boolean) of Flush_Mode
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| 83 | := (True => Finish, False => No_Flush);
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| 84 |
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| 85 | procedure Raise_Error (Stream : in Z_Stream);
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| 86 | pragma Inline (Raise_Error);
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| 87 |
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| 88 | procedure Raise_Error (Message : in String);
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| 89 | pragma Inline (Raise_Error);
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| 90 |
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| 91 | procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int);
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| 92 |
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| 93 | procedure Free is new Ada.Unchecked_Deallocation
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| 94 | (Z_Stream, Z_Stream_Access);
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| 95 |
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| 96 | function To_Thin_Access is new Ada.Unchecked_Conversion
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| 97 | (Z_Stream_Access, Thin.Z_Streamp);
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| 98 |
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| 99 | procedure Translate_GZip
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| 100 | (Filter : in out Filter_Type;
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| 101 | In_Data : in Ada.Streams.Stream_Element_Array;
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| 102 | In_Last : out Ada.Streams.Stream_Element_Offset;
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| 103 | Out_Data : out Ada.Streams.Stream_Element_Array;
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| 104 | Out_Last : out Ada.Streams.Stream_Element_Offset;
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| 105 | Flush : in Flush_Mode);
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| 106 | -- Separate translate routine for make gzip header.
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| 107 |
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| 108 | procedure Translate_Auto
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| 109 | (Filter : in out Filter_Type;
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| 110 | In_Data : in Ada.Streams.Stream_Element_Array;
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| 111 | In_Last : out Ada.Streams.Stream_Element_Offset;
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| 112 | Out_Data : out Ada.Streams.Stream_Element_Array;
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| 113 | Out_Last : out Ada.Streams.Stream_Element_Offset;
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| 114 | Flush : in Flush_Mode);
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| 115 | -- translate routine without additional headers.
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| 116 |
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| 117 | -----------------
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| 118 | -- Check_Error --
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| 119 | -----------------
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| 120 |
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| 121 | procedure Check_Error (Stream : in Z_Stream; Code : in Thin.Int) is
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| 122 | use type Thin.Int;
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| 123 | begin
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| 124 | if Code /= Thin.Z_OK then
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| 125 | Raise_Error
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| 126 | (Return_Code_Enum'Image (Return_Code (Code))
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| 127 | & ": " & Last_Error_Message (Stream));
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| 128 | end if;
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| 129 | end Check_Error;
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| 130 |
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| 131 | -----------
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| 132 | -- Close --
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| 133 | -----------
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| 134 |
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| 135 | procedure Close
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| 136 | (Filter : in out Filter_Type;
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| 137 | Ignore_Error : in Boolean := False)
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| 138 | is
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| 139 | Code : Thin.Int;
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| 140 | begin
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| 141 | if not Ignore_Error and then not Is_Open (Filter) then
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| 142 | raise Status_Error;
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| 143 | end if;
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| 144 |
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| 145 | Code := Flate (Filter.Compression).Done (To_Thin_Access (Filter.Strm));
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| 146 |
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| 147 | if Ignore_Error or else Code = Thin.Z_OK then
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| 148 | Free (Filter.Strm);
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| 149 | else
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| 150 | declare
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| 151 | Error_Message : constant String
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| 152 | := Last_Error_Message (Filter.Strm.all);
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| 153 | begin
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| 154 | Free (Filter.Strm);
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| 155 | Ada.Exceptions.Raise_Exception
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| 156 | (ZLib_Error'Identity,
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| 157 | Return_Code_Enum'Image (Return_Code (Code))
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| 158 | & ": " & Error_Message);
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| 159 | end;
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| 160 | end if;
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| 161 | end Close;
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| 162 |
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| 163 | -----------
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| 164 | -- CRC32 --
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| 165 | -----------
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| 166 |
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| 167 | function CRC32
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| 168 | (CRC : in Unsigned_32;
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| 169 | Data : in Ada.Streams.Stream_Element_Array)
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| 170 | return Unsigned_32
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| 171 | is
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| 172 | use Thin;
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| 173 | begin
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| 174 | return Unsigned_32 (crc32 (ULong (CRC),
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| 175 | Data'Address,
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| 176 | Data'Length));
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| 177 | end CRC32;
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| 178 |
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| 179 | procedure CRC32
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| 180 | (CRC : in out Unsigned_32;
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| 181 | Data : in Ada.Streams.Stream_Element_Array) is
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| 182 | begin
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| 183 | CRC := CRC32 (CRC, Data);
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| 184 | end CRC32;
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| 185 |
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| 186 | ------------------
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| 187 | -- Deflate_Init --
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| 188 | ------------------
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| 189 |
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| 190 | procedure Deflate_Init
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| 191 | (Filter : in out Filter_Type;
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| 192 | Level : in Compression_Level := Default_Compression;
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| 193 | Strategy : in Strategy_Type := Default_Strategy;
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| 194 | Method : in Compression_Method := Deflated;
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| 195 | Window_Bits : in Window_Bits_Type := Default_Window_Bits;
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| 196 | Memory_Level : in Memory_Level_Type := Default_Memory_Level;
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| 197 | Header : in Header_Type := Default)
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| 198 | is
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| 199 | use type Thin.Int;
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| 200 | Win_Bits : Thin.Int := Thin.Int (Window_Bits);
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| 201 | begin
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| 202 | if Is_Open (Filter) then
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| 203 | raise Status_Error;
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| 204 | end if;
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| 205 |
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| 206 | -- We allow ZLib to make header only in case of default header type.
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| 207 | -- Otherwise we would either do header by ourselfs, or do not do
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| 208 | -- header at all.
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| 209 |
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| 210 | if Header = None or else Header = GZip then
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| 211 | Win_Bits := -Win_Bits;
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| 212 | end if;
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| 213 |
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| 214 | -- For the GZip CRC calculation and make headers.
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| 215 |
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| 216 | if Header = GZip then
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| 217 | Filter.CRC := 0;
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| 218 | Filter.Offset := Simple_GZip_Header'First;
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| 219 | else
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| 220 | Filter.Offset := Simple_GZip_Header'Last + 1;
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| 221 | end if;
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| 222 |
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| 223 | Filter.Strm := new Z_Stream;
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| 224 | Filter.Compression := True;
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| 225 | Filter.Stream_End := False;
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| 226 | Filter.Header := Header;
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| 227 |
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| 228 | if Thin.Deflate_Init
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| 229 | (To_Thin_Access (Filter.Strm),
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| 230 | Level => Thin.Int (Level),
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| 231 | method => Thin.Int (Method),
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| 232 | windowBits => Win_Bits,
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| 233 | memLevel => Thin.Int (Memory_Level),
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| 234 | strategy => Thin.Int (Strategy)) /= Thin.Z_OK
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| 235 | then
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| 236 | Raise_Error (Filter.Strm.all);
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| 237 | end if;
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| 238 | end Deflate_Init;
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| 239 |
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| 240 | -----------
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| 241 | -- Flush --
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| 242 | -----------
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| 243 |
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| 244 | procedure Flush
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| 245 | (Filter : in out Filter_Type;
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| 246 | Out_Data : out Ada.Streams.Stream_Element_Array;
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| 247 | Out_Last : out Ada.Streams.Stream_Element_Offset;
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| 248 | Flush : in Flush_Mode)
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| 249 | is
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| 250 | No_Data : Stream_Element_Array := (1 .. 0 => 0);
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| 251 | Last : Stream_Element_Offset;
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| 252 | begin
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| 253 | Translate (Filter, No_Data, Last, Out_Data, Out_Last, Flush);
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| 254 | end Flush;
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| 255 |
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| 256 | -----------------------
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| 257 | -- Generic_Translate --
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| 258 | -----------------------
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| 259 |
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| 260 | procedure Generic_Translate
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| 261 | (Filter : in out ZLib.Filter_Type;
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| 262 | In_Buffer_Size : in Integer := Default_Buffer_Size;
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| 263 | Out_Buffer_Size : in Integer := Default_Buffer_Size)
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| 264 | is
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| 265 | In_Buffer : Stream_Element_Array
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| 266 | (1 .. Stream_Element_Offset (In_Buffer_Size));
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| 267 | Out_Buffer : Stream_Element_Array
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| 268 | (1 .. Stream_Element_Offset (Out_Buffer_Size));
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| 269 | Last : Stream_Element_Offset;
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| 270 | In_Last : Stream_Element_Offset;
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| 271 | In_First : Stream_Element_Offset;
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| 272 | Out_Last : Stream_Element_Offset;
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| 273 | begin
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| 274 | Main : loop
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| 275 | Data_In (In_Buffer, Last);
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| 276 |
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| 277 | In_First := In_Buffer'First;
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| 278 |
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| 279 | loop
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| 280 | Translate
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| 281 | (Filter => Filter,
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| 282 | In_Data => In_Buffer (In_First .. Last),
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| 283 | In_Last => In_Last,
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| 284 | Out_Data => Out_Buffer,
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| 285 | Out_Last => Out_Last,
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| 286 | Flush => Flush_Finish (Last < In_Buffer'First));
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| 287 |
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| 288 | if Out_Buffer'First <= Out_Last then
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| 289 | Data_Out (Out_Buffer (Out_Buffer'First .. Out_Last));
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| 290 | end if;
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| 291 |
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| 292 | exit Main when Stream_End (Filter);
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| 293 |
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| 294 | -- The end of in buffer.
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| 295 |
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| 296 | exit when In_Last = Last;
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| 297 |
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| 298 | In_First := In_Last + 1;
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| 299 | end loop;
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| 300 | end loop Main;
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| 301 |
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| 302 | end Generic_Translate;
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| 303 |
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| 304 | ------------------
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| 305 | -- Inflate_Init --
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| 306 | ------------------
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| 307 |
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| 308 | procedure Inflate_Init
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| 309 | (Filter : in out Filter_Type;
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| 310 | Window_Bits : in Window_Bits_Type := Default_Window_Bits;
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| 311 | Header : in Header_Type := Default)
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| 312 | is
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| 313 | use type Thin.Int;
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| 314 | Win_Bits : Thin.Int := Thin.Int (Window_Bits);
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| 315 |
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| 316 | procedure Check_Version;
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| 317 | -- Check the latest header types compatibility.
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| 318 |
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| 319 | procedure Check_Version is
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| 320 | begin
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| 321 | if Version <= "1.1.4" then
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| 322 | Raise_Error
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| 323 | ("Inflate header type " & Header_Type'Image (Header)
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| 324 | & " incompatible with ZLib version " & Version);
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| 325 | end if;
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| 326 | end Check_Version;
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| 327 |
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| 328 | begin
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| 329 | if Is_Open (Filter) then
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| 330 | raise Status_Error;
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| 331 | end if;
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| 332 |
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| 333 | case Header is
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| 334 | when None =>
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| 335 | Check_Version;
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| 336 |
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| 337 | -- Inflate data without headers determined
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| 338 | -- by negative Win_Bits.
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| 339 |
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| 340 | Win_Bits := -Win_Bits;
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| 341 | when GZip =>
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| 342 | Check_Version;
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| 343 |
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| 344 | -- Inflate gzip data defined by flag 16.
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| 345 |
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| 346 | Win_Bits := Win_Bits + 16;
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| 347 | when Auto =>
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| 348 | Check_Version;
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| 349 |
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| 350 | -- Inflate with automatic detection
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| 351 | -- of gzip or native header defined by flag 32.
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| 352 |
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| 353 | Win_Bits := Win_Bits + 32;
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| 354 | when Default => null;
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| 355 | end case;
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| 356 |
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| 357 | Filter.Strm := new Z_Stream;
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| 358 | Filter.Compression := False;
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| 359 | Filter.Stream_End := False;
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| 360 | Filter.Header := Header;
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| 361 |
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| 362 | if Thin.Inflate_Init
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| 363 | (To_Thin_Access (Filter.Strm), Win_Bits) /= Thin.Z_OK
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| 364 | then
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| 365 | Raise_Error (Filter.Strm.all);
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| 366 | end if;
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| 367 | end Inflate_Init;
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| 368 |
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| 369 | -------------
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| 370 | -- Is_Open --
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| 371 | -------------
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| 372 |
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| 373 | function Is_Open (Filter : in Filter_Type) return Boolean is
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| 374 | begin
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| 375 | return Filter.Strm /= null;
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| 376 | end Is_Open;
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| 377 |
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| 378 | -----------------
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| 379 | -- Raise_Error --
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| 380 | -----------------
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| 381 |
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| 382 | procedure Raise_Error (Message : in String) is
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| 383 | begin
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| 384 | Ada.Exceptions.Raise_Exception (ZLib_Error'Identity, Message);
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| 385 | end Raise_Error;
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| 386 |
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| 387 | procedure Raise_Error (Stream : in Z_Stream) is
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| 388 | begin
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| 389 | Raise_Error (Last_Error_Message (Stream));
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| 390 | end Raise_Error;
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| 391 |
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| 392 | ----------
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| 393 | -- Read --
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| 394 | ----------
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| 395 |
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| 396 | procedure Read
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| 397 | (Filter : in out Filter_Type;
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| 398 | Item : out Ada.Streams.Stream_Element_Array;
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| 399 | Last : out Ada.Streams.Stream_Element_Offset;
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| 400 | Flush : in Flush_Mode := No_Flush)
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| 401 | is
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| 402 | In_Last : Stream_Element_Offset;
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| 403 | Item_First : Ada.Streams.Stream_Element_Offset := Item'First;
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| 404 | V_Flush : Flush_Mode := Flush;
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| 405 |
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| 406 | begin
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| 407 | pragma Assert (Rest_First in Buffer'First .. Buffer'Last + 1);
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| 408 | pragma Assert (Rest_Last in Buffer'First - 1 .. Buffer'Last);
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| 409 |
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| 410 | loop
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| 411 | if Rest_Last = Buffer'First - 1 then
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| 412 | V_Flush := Finish;
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| 413 |
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| 414 | elsif Rest_First > Rest_Last then
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| 415 | Read (Buffer, Rest_Last);
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| 416 | Rest_First := Buffer'First;
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| 417 |
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| 418 | if Rest_Last < Buffer'First then
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| 419 | V_Flush := Finish;
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| 420 | end if;
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| 421 | end if;
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| 422 |
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| 423 | Translate
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| 424 | (Filter => Filter,
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| 425 | In_Data => Buffer (Rest_First .. Rest_Last),
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| 426 | In_Last => In_Last,
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| 427 | Out_Data => Item (Item_First .. Item'Last),
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| 428 | Out_Last => Last,
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| 429 | Flush => V_Flush);
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| 430 |
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| 431 | Rest_First := In_Last + 1;
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| 432 |
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| 433 | exit when Stream_End (Filter)
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| 434 | or else Last = Item'Last
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| 435 | or else (Last >= Item'First and then Allow_Read_Some);
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| 436 |
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| 437 | Item_First := Last + 1;
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| 438 | end loop;
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| 439 | end Read;
|
|---|
| 440 |
|
|---|
| 441 | ----------------
|
|---|
| 442 | -- Stream_End --
|
|---|
| 443 | ----------------
|
|---|
| 444 |
|
|---|
| 445 | function Stream_End (Filter : in Filter_Type) return Boolean is
|
|---|
| 446 | begin
|
|---|
| 447 | if Filter.Header = GZip and Filter.Compression then
|
|---|
| 448 | return Filter.Stream_End
|
|---|
| 449 | and then Filter.Offset = Footer_Array'Last + 1;
|
|---|
| 450 | else
|
|---|
| 451 | return Filter.Stream_End;
|
|---|
| 452 | end if;
|
|---|
| 453 | end Stream_End;
|
|---|
| 454 |
|
|---|
| 455 | --------------
|
|---|
| 456 | -- Total_In --
|
|---|
| 457 | --------------
|
|---|
| 458 |
|
|---|
| 459 | function Total_In (Filter : in Filter_Type) return Count is
|
|---|
| 460 | begin
|
|---|
| 461 | return Count (Thin.Total_In (To_Thin_Access (Filter.Strm).all));
|
|---|
| 462 | end Total_In;
|
|---|
| 463 |
|
|---|
| 464 | ---------------
|
|---|
| 465 | -- Total_Out --
|
|---|
| 466 | ---------------
|
|---|
| 467 |
|
|---|
| 468 | function Total_Out (Filter : in Filter_Type) return Count is
|
|---|
| 469 | begin
|
|---|
| 470 | return Count (Thin.Total_Out (To_Thin_Access (Filter.Strm).all));
|
|---|
| 471 | end Total_Out;
|
|---|
| 472 |
|
|---|
| 473 | ---------------
|
|---|
| 474 | -- Translate --
|
|---|
| 475 | ---------------
|
|---|
| 476 |
|
|---|
| 477 | procedure Translate
|
|---|
| 478 | (Filter : in out Filter_Type;
|
|---|
| 479 | In_Data : in Ada.Streams.Stream_Element_Array;
|
|---|
| 480 | In_Last : out Ada.Streams.Stream_Element_Offset;
|
|---|
| 481 | Out_Data : out Ada.Streams.Stream_Element_Array;
|
|---|
| 482 | Out_Last : out Ada.Streams.Stream_Element_Offset;
|
|---|
| 483 | Flush : in Flush_Mode) is
|
|---|
| 484 | begin
|
|---|
| 485 | if Filter.Header = GZip and then Filter.Compression then
|
|---|
| 486 | Translate_GZip
|
|---|
| 487 | (Filter => Filter,
|
|---|
| 488 | In_Data => In_Data,
|
|---|
| 489 | In_Last => In_Last,
|
|---|
| 490 | Out_Data => Out_Data,
|
|---|
| 491 | Out_Last => Out_Last,
|
|---|
| 492 | Flush => Flush);
|
|---|
| 493 | else
|
|---|
| 494 | Translate_Auto
|
|---|
| 495 | (Filter => Filter,
|
|---|
| 496 | In_Data => In_Data,
|
|---|
| 497 | In_Last => In_Last,
|
|---|
| 498 | Out_Data => Out_Data,
|
|---|
| 499 | Out_Last => Out_Last,
|
|---|
| 500 | Flush => Flush);
|
|---|
| 501 | end if;
|
|---|
| 502 | end Translate;
|
|---|
| 503 |
|
|---|
| 504 | --------------------
|
|---|
| 505 | -- Translate_Auto --
|
|---|
| 506 | --------------------
|
|---|
| 507 |
|
|---|
| 508 | procedure Translate_Auto
|
|---|
| 509 | (Filter : in out Filter_Type;
|
|---|
| 510 | In_Data : in Ada.Streams.Stream_Element_Array;
|
|---|
| 511 | In_Last : out Ada.Streams.Stream_Element_Offset;
|
|---|
| 512 | Out_Data : out Ada.Streams.Stream_Element_Array;
|
|---|
| 513 | Out_Last : out Ada.Streams.Stream_Element_Offset;
|
|---|
| 514 | Flush : in Flush_Mode)
|
|---|
| 515 | is
|
|---|
| 516 | use type Thin.Int;
|
|---|
| 517 | Code : Thin.Int;
|
|---|
| 518 |
|
|---|
| 519 | begin
|
|---|
| 520 | if not Is_Open (Filter) then
|
|---|
| 521 | raise Status_Error;
|
|---|
| 522 | end if;
|
|---|
| 523 |
|
|---|
| 524 | if Out_Data'Length = 0 and then In_Data'Length = 0 then
|
|---|
| 525 | raise Constraint_Error;
|
|---|
| 526 | end if;
|
|---|
| 527 |
|
|---|
| 528 | Set_Out (Filter.Strm.all, Out_Data'Address, Out_Data'Length);
|
|---|
| 529 | Set_In (Filter.Strm.all, In_Data'Address, In_Data'Length);
|
|---|
| 530 |
|
|---|
| 531 | Code := Flate (Filter.Compression).Step
|
|---|
| 532 | (To_Thin_Access (Filter.Strm),
|
|---|
| 533 | Thin.Int (Flush));
|
|---|
| 534 |
|
|---|
| 535 | if Code = Thin.Z_STREAM_END then
|
|---|
| 536 | Filter.Stream_End := True;
|
|---|
| 537 | else
|
|---|
| 538 | Check_Error (Filter.Strm.all, Code);
|
|---|
| 539 | end if;
|
|---|
| 540 |
|
|---|
| 541 | In_Last := In_Data'Last
|
|---|
| 542 | - Stream_Element_Offset (Avail_In (Filter.Strm.all));
|
|---|
| 543 | Out_Last := Out_Data'Last
|
|---|
| 544 | - Stream_Element_Offset (Avail_Out (Filter.Strm.all));
|
|---|
| 545 | end Translate_Auto;
|
|---|
| 546 |
|
|---|
| 547 | --------------------
|
|---|
| 548 | -- Translate_GZip --
|
|---|
| 549 | --------------------
|
|---|
| 550 |
|
|---|
| 551 | procedure Translate_GZip
|
|---|
| 552 | (Filter : in out Filter_Type;
|
|---|
| 553 | In_Data : in Ada.Streams.Stream_Element_Array;
|
|---|
| 554 | In_Last : out Ada.Streams.Stream_Element_Offset;
|
|---|
| 555 | Out_Data : out Ada.Streams.Stream_Element_Array;
|
|---|
| 556 | Out_Last : out Ada.Streams.Stream_Element_Offset;
|
|---|
| 557 | Flush : in Flush_Mode)
|
|---|
| 558 | is
|
|---|
| 559 | Out_First : Stream_Element_Offset;
|
|---|
| 560 |
|
|---|
| 561 | procedure Add_Data (Data : in Stream_Element_Array);
|
|---|
| 562 | -- Add data to stream from the Filter.Offset till necessary,
|
|---|
| 563 | -- used for add gzip headr/footer.
|
|---|
| 564 |
|
|---|
| 565 | procedure Put_32
|
|---|
| 566 | (Item : in out Stream_Element_Array;
|
|---|
| 567 | Data : in Unsigned_32);
|
|---|
| 568 | pragma Inline (Put_32);
|
|---|
| 569 |
|
|---|
| 570 | --------------
|
|---|
| 571 | -- Add_Data --
|
|---|
| 572 | --------------
|
|---|
| 573 |
|
|---|
| 574 | procedure Add_Data (Data : in Stream_Element_Array) is
|
|---|
| 575 | Data_First : Stream_Element_Offset renames Filter.Offset;
|
|---|
| 576 | Data_Last : Stream_Element_Offset;
|
|---|
| 577 | Data_Len : Stream_Element_Offset; -- -1
|
|---|
| 578 | Out_Len : Stream_Element_Offset; -- -1
|
|---|
| 579 | begin
|
|---|
| 580 | Out_First := Out_Last + 1;
|
|---|
| 581 |
|
|---|
| 582 | if Data_First > Data'Last then
|
|---|
| 583 | return;
|
|---|
| 584 | end if;
|
|---|
| 585 |
|
|---|
| 586 | Data_Len := Data'Last - Data_First;
|
|---|
| 587 | Out_Len := Out_Data'Last - Out_First;
|
|---|
| 588 |
|
|---|
| 589 | if Data_Len <= Out_Len then
|
|---|
| 590 | Out_Last := Out_First + Data_Len;
|
|---|
| 591 | Data_Last := Data'Last;
|
|---|
| 592 | else
|
|---|
| 593 | Out_Last := Out_Data'Last;
|
|---|
| 594 | Data_Last := Data_First + Out_Len;
|
|---|
| 595 | end if;
|
|---|
| 596 |
|
|---|
| 597 | Out_Data (Out_First .. Out_Last) := Data (Data_First .. Data_Last);
|
|---|
| 598 |
|
|---|
| 599 | Data_First := Data_Last + 1;
|
|---|
| 600 | Out_First := Out_Last + 1;
|
|---|
| 601 | end Add_Data;
|
|---|
| 602 |
|
|---|
| 603 | ------------
|
|---|
| 604 | -- Put_32 --
|
|---|
| 605 | ------------
|
|---|
| 606 |
|
|---|
| 607 | procedure Put_32
|
|---|
| 608 | (Item : in out Stream_Element_Array;
|
|---|
| 609 | Data : in Unsigned_32)
|
|---|
| 610 | is
|
|---|
| 611 | D : Unsigned_32 := Data;
|
|---|
| 612 | begin
|
|---|
| 613 | for J in Item'First .. Item'First + 3 loop
|
|---|
| 614 | Item (J) := Stream_Element (D and 16#FF#);
|
|---|
| 615 | D := Shift_Right (D, 8);
|
|---|
| 616 | end loop;
|
|---|
| 617 | end Put_32;
|
|---|
| 618 |
|
|---|
| 619 | begin
|
|---|
| 620 | Out_Last := Out_Data'First - 1;
|
|---|
| 621 |
|
|---|
| 622 | if not Filter.Stream_End then
|
|---|
| 623 | Add_Data (Simple_GZip_Header);
|
|---|
| 624 |
|
|---|
| 625 | Translate_Auto
|
|---|
| 626 | (Filter => Filter,
|
|---|
| 627 | In_Data => In_Data,
|
|---|
| 628 | In_Last => In_Last,
|
|---|
| 629 | Out_Data => Out_Data (Out_First .. Out_Data'Last),
|
|---|
| 630 | Out_Last => Out_Last,
|
|---|
| 631 | Flush => Flush);
|
|---|
| 632 |
|
|---|
| 633 | CRC32 (Filter.CRC, In_Data (In_Data'First .. In_Last));
|
|---|
| 634 | end if;
|
|---|
| 635 |
|
|---|
| 636 | if Filter.Stream_End and then Out_Last <= Out_Data'Last then
|
|---|
| 637 | -- This detection method would work only when
|
|---|
| 638 | -- Simple_GZip_Header'Last > Footer_Array'Last
|
|---|
| 639 |
|
|---|
| 640 | if Filter.Offset = Simple_GZip_Header'Last + 1 then
|
|---|
| 641 | Filter.Offset := Footer_Array'First;
|
|---|
| 642 | end if;
|
|---|
| 643 |
|
|---|
| 644 | declare
|
|---|
| 645 | Footer : Footer_Array;
|
|---|
| 646 | begin
|
|---|
| 647 | Put_32 (Footer, Filter.CRC);
|
|---|
| 648 | Put_32 (Footer (Footer'First + 4 .. Footer'Last),
|
|---|
| 649 | Unsigned_32 (Total_In (Filter)));
|
|---|
| 650 | Add_Data (Footer);
|
|---|
| 651 | end;
|
|---|
| 652 | end if;
|
|---|
| 653 | end Translate_GZip;
|
|---|
| 654 |
|
|---|
| 655 | -------------
|
|---|
| 656 | -- Version --
|
|---|
| 657 | -------------
|
|---|
| 658 |
|
|---|
| 659 | function Version return String is
|
|---|
| 660 | begin
|
|---|
| 661 | return Interfaces.C.Strings.Value (Thin.zlibVersion);
|
|---|
| 662 | end Version;
|
|---|
| 663 |
|
|---|
| 664 | -----------
|
|---|
| 665 | -- Write --
|
|---|
| 666 | -----------
|
|---|
| 667 |
|
|---|
| 668 | procedure Write
|
|---|
| 669 | (Filter : in out Filter_Type;
|
|---|
| 670 | Item : in Ada.Streams.Stream_Element_Array;
|
|---|
| 671 | Flush : in Flush_Mode := No_Flush)
|
|---|
| 672 | is
|
|---|
| 673 | Buffer : Stream_Element_Array (1 .. Buffer_Size);
|
|---|
| 674 | In_Last : Stream_Element_Offset;
|
|---|
| 675 | Out_Last : Stream_Element_Offset;
|
|---|
| 676 | In_First : Stream_Element_Offset := Item'First;
|
|---|
| 677 | begin
|
|---|
| 678 | if Item'Length = 0 and Flush = No_Flush then
|
|---|
| 679 | return;
|
|---|
| 680 | end if;
|
|---|
| 681 |
|
|---|
| 682 | loop
|
|---|
| 683 | Translate
|
|---|
| 684 | (Filter => Filter,
|
|---|
| 685 | In_Data => Item (In_First .. Item'Last),
|
|---|
| 686 | In_Last => In_Last,
|
|---|
| 687 | Out_Data => Buffer,
|
|---|
| 688 | Out_Last => Out_Last,
|
|---|
| 689 | Flush => Flush);
|
|---|
| 690 |
|
|---|
| 691 | if Out_Last >= Buffer'First then
|
|---|
| 692 | Write (Buffer (1 .. Out_Last));
|
|---|
| 693 | end if;
|
|---|
| 694 |
|
|---|
| 695 | exit when In_Last = Item'Last or Stream_End (Filter);
|
|---|
| 696 |
|
|---|
| 697 | In_First := In_Last + 1;
|
|---|
| 698 | end loop;
|
|---|
| 699 | end Write;
|
|---|
| 700 |
|
|---|
| 701 | end ZLib;
|
|---|
