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function Intel_Bf is new Intel_X86_Buffer (Unsigned_32, 4);
---------------------
-- PK signatures --
---------------------
function Pk_Signature (Buf : Stream_Element_Array; Code : Stream_Element) return Boolean is
begin
return Buf (Buf'First .. Buf'First + 3) = (16#50#, 16#4B#, Code, Code + 1);
-- PK12, PK34, ...
end Pk_Signature;
procedure Pk_Signature (Buf : in out Stream_Element_Array; Code : Stream_Element) is
begin
Buf (1 .. 4) := (16#50#, 16#4B#, Code, Code + 1); -- PK12, PK34, ...
end Pk_Signature;
---------------------------------------------------------
-- PKZIP file header, as in central directory - PK12 --
---------------------------------------------------------
procedure Read_And_Check
(Stream : in out Root_Zipstream_Type'Class;
Header : out Central_File_Header)
is
Chb : Stream_Element_Array (1 .. 46);
begin
Blockread (Stream, Chb);
if not Pk_Signature (Chb, 1) then
raise Bad_Central_Header;
end if;
Header.Made_By_Version := Intel_Nb (Chb (5 .. 6));
Header.Short_Info.Needed_Extract_Version := Intel_Nb (Chb (7 .. 8));
Header.Short_Info.Bit_Flag := Intel_Nb (Chb (9 .. 10));
Header.Short_Info.Zip_Type := Intel_Nb (Chb (11 .. 12));
Header.Short_Info.File_Timedate :=
DCF.Streams.Convert (Unsigned_32'(Intel_Nb (Chb (13 .. 16))));
Header.Short_Info.Dd.Crc_32 := Intel_Nb (Chb (17 .. 20));
Header.Short_Info.Dd.Compressed_Size := Intel_Nb (Chb (21 .. 24));
Header.Short_Info.Dd.Uncompressed_Size := Intel_Nb (Chb (25 .. 28));
Header.Short_Info.Filename_Length := Intel_Nb (Chb (29 .. 30));
Header.Short_Info.Extra_Field_Length := Intel_Nb (Chb (31 .. 32));
Header.Comment_Length := Intel_Nb (Chb (33 .. 34));
Header.Disk_Number_Start := Intel_Nb (Chb (35 .. 36));
Header.Internal_Attributes := Intel_Nb (Chb (37 .. 38));
Header.External_Attributes := Intel_Nb (Chb (39 .. 42));
Header.Local_Header_Offset := Intel_Nb (Chb (43 .. 46));
if not Valid_Version (Header.Short_Info) then
raise Bad_Central_Header with "Archive needs invalid version to extract";
end if;
if Header.Disk_Number_Start /= 0 then
raise Bad_Central_Header with "Archive may not span multiple volumes";
end if;
if not Valid_Bitflag (Header.Short_Info) then
raise Bad_Central_Header with "Archive uses prohibited features";
end if;
end Read_And_Check;
procedure Write (Stream : in out Root_Zipstream_Type'Class; Header : in Central_File_Header) is
Chb : Stream_Element_Array (1 .. 46);
begin
Pk_Signature (Chb, 1);
Chb (5 .. 6) := Intel_Bf (Header.Made_By_Version);
Chb (7 .. 8) := Intel_Bf (Header.Short_Info.Needed_Extract_Version);
Chb (9 .. 10) := Intel_Bf (Header.Short_Info.Bit_Flag);
Chb (11 .. 12) := Intel_Bf (Header.Short_Info.Zip_Type);
Chb (13 .. 16) := Intel_Bf (DCF.Streams.Convert (Header.Short_Info.File_Timedate));
Chb (17 .. 20) := Intel_Bf (Header.Short_Info.Dd.Crc_32);
Chb (21 .. 24) := Intel_Bf (Header.Short_Info.Dd.Compressed_Size);
Chb (25 .. 28) := Intel_Bf (Header.Short_Info.Dd.Uncompressed_Size);
Chb (29 .. 30) := Intel_Bf (Header.Short_Info.Filename_Length);
Chb (31 .. 32) := Intel_Bf (Header.Short_Info.Extra_Field_Length);
Chb (33 .. 34) := Intel_Bf (Header.Comment_Length);
Chb (35 .. 36) := Intel_Bf (Header.Disk_Number_Start);
Chb (37 .. 38) := Intel_Bf (Header.Internal_Attributes);
Chb (39 .. 42) := Intel_Bf (Header.External_Attributes);
Chb (43 .. 46) := Intel_Bf (Header.Local_Header_Offset);
Stream.Write (Chb);
end Write;
-------------------------------------------------------------------------
-- PKZIP local file header, in front of every file in archive - PK34 --
-------------------------------------------------------------------------
procedure Read_And_Check
(Stream : in out Root_Zipstream_Type'Class;
Header : out Local_File_Header)
is
Lhb : Stream_Element_Array (1 .. 30);
begin
Blockread (Stream, Lhb);
if not Pk_Signature (Lhb, 3) then
raise Bad_Local_Header;
end if;