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Header.Needed_Extract_Version := Intel_Nb (Lhb (5 .. 6));
Header.Bit_Flag := Intel_Nb (Lhb (7 .. 8));
Header.Zip_Type := Intel_Nb (Lhb (9 .. 10));
Header.File_Timedate :=
DCF.Streams.Convert (Unsigned_32'(Intel_Nb (Lhb (11 .. 14))));
Header.Dd.Crc_32 := Intel_Nb (Lhb (15 .. 18));
Header.Dd.Compressed_Size := Intel_Nb (Lhb (19 .. 22));
Header.Dd.Uncompressed_Size := Intel_Nb (Lhb (23 .. 26));
Header.Filename_Length := Intel_Nb (Lhb (27 .. 28));
Header.Extra_Field_Length := Intel_Nb (Lhb (29 .. 30));
if not Valid_Version (Header) then
raise Bad_Local_Header with "Archived file needs invalid version to extract";
end if;
if not Valid_Bitflag (Header) then
raise Bad_Local_Header with "Archived file uses prohibited features";
end if;
end Read_And_Check;
procedure Write (Stream : in out Root_Zipstream_Type'Class; Header : in Local_File_Header) is
Lhb : Stream_Element_Array (1 .. 30);
begin
Pk_Signature (Lhb, 3);
Lhb (5 .. 6) := Intel_Bf (Header.Needed_Extract_Version);
Lhb (7 .. 8) := Intel_Bf (Header.Bit_Flag);
Lhb (9 .. 10) := Intel_Bf (Header.Zip_Type);
Lhb (11 .. 14) := Intel_Bf (DCF.Streams.Convert (Header.File_Timedate));
Lhb (15 .. 18) := Intel_Bf (Header.Dd.Crc_32);
Lhb (19 .. 22) := Intel_Bf (Header.Dd.Compressed_Size);
Lhb (23 .. 26) := Intel_Bf (Header.Dd.Uncompressed_Size);
Lhb (27 .. 28) := Intel_Bf (Header.Filename_Length);
Lhb (29 .. 30) := Intel_Bf (Header.Extra_Field_Length);
Stream.Write (Lhb);
end Write;
---------------------------------------------
-- PKZIP end-of-central-directory - PK56 --
---------------------------------------------
procedure Copy_And_Check (Buffer : in Stream_Element_Array; The_End : out End_Of_Central_Dir) is
O : constant Stream_Element_Offset := Buffer'First - 1;
begin
if not Pk_Signature (Buffer, 5) then
raise Bad_End;
end if;
The_End.Disknum := Intel_Nb (Buffer (O + 5 .. O + 6));
The_End.Disknum_With_Start := Intel_Nb (Buffer (O + 7 .. O + 8));
The_End.Disk_Total_Entries := Intel_Nb (Buffer (O + 9 .. O + 10));
The_End.Total_Entries := Intel_Nb (Buffer (O + 11 .. O + 12));
The_End.Central_Dir_Size := Intel_Nb (Buffer (O + 13 .. O + 16));
The_End.Central_Dir_Offset := Intel_Nb (Buffer (O + 17 .. O + 20));
The_End.Main_Comment_Length := Intel_Nb (Buffer (O + 21 .. O + 22));
end Copy_And_Check;
procedure Read_And_Check
(Stream : in out Root_Zipstream_Type'Class;
The_End : out End_Of_Central_Dir)
is
Buffer : Stream_Element_Array (1 .. 22);
begin
Blockread (Stream, Buffer);
Copy_And_Check (Buffer, The_End);
end Read_And_Check;
procedure Load (Stream : in out Root_Zipstream_Type'Class; The_End : out End_Of_Central_Dir) is
Min_End_Start : Zs_Index_Type; -- min_end_start >= 1
Max_Comment : constant := 65_535;
-- In appnote.txt :
-- .ZIP file comment length 2 bytes
begin
if Size (Stream) < 22 then
raise Bad_End;
end if;
-- 20-Jun-2001: abandon search below min_end_start.
if Size (Stream) <= Max_Comment then
Min_End_Start := 1;
else
Min_End_Start := Size (Stream) - Max_Comment;
end if;
Set_Index (Stream, Min_End_Start);
declare
-- We copy a large chunk of the zip stream's tail into a buffer.
Large_Buffer : Stream_Element_Array
(0 .. Stream_Element_Count (Size (Stream) - Min_End_Start));
Ilb : Stream_Element_Offset;
X : Zs_Size_Type;
begin
Blockread (Stream, Large_Buffer);
for I in reverse Min_End_Start .. Size (Stream) - 21 loop
-- Yes, we must _search_ for the header...
-- because PKWARE put a variable-size comment _after_ it 8-(
Ilb := Stream_Element_Offset (I - Min_End_Start);
if Pk_Signature (Large_Buffer (Ilb .. Ilb + 3), 5) then
Copy_And_Check (Large_Buffer (Ilb .. Ilb + 21), The_End);
-- At this point, the buffer was successfully read, the_end is
-- is set with its standard contents.