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ada-git-code

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bit_flag => Intel_nb (lhb (7 .. 8)),
zip_type => Intel_nb (lhb (9 .. 10)),
file_timedate => Zip_Streams.Calendar.Convert (Unsigned_32'(Intel_nb (lhb (11 .. 14)))),
dd =>
(crc_32 => Intel_nb (lhb (15 .. 18)),
compressed_size => Intel_nb (lhb (19 .. 22)),
uncompressed_size => Intel_nb (lhb (23 .. 26))),
filename_length => Intel_nb (lhb (27 .. 28)),
extra_field_length => Intel_nb (lhb (29 .. 30)));
end Read_and_check;
procedure Write (stream : Zipstream_Class;
header : Local_File_Header) is
lhb : Byte_Buffer (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 (Zip_Streams.Calendar.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);
BlockWrite (stream.all, lhb);
end Write;
-------------------------------------------
-- PKZIP end - of - central - directory - PK56 --
-------------------------------------------
procedure Copy_and_check (buffer : Byte_Buffer;
the_end : out End_of_Central_Dir) is
begin
if not PK_signature (buffer, 5) then
raise bad_end;
end if;
the_end :=
(disknum => Intel_nb (buffer (5 .. 6)),
disknum_with_start => Intel_nb (buffer (7 .. 8)),
disk_total_entries => Intel_nb (buffer (9 .. 10)),
total_entries => Intel_nb (buffer (11 .. 12)),
central_dir_size => Intel_nb (buffer (13 .. 16)),
central_dir_offset => Intel_nb (buffer (17 .. 20)),
main_comment_length => Intel_nb (buffer (21 .. 22)),
offset_shifting => 0); -- Assuming single zip archive here
end Copy_and_check;
procedure Read_and_check (stream : Zipstream_Class;
the_end : out End_of_Central_Dir) is
eb : Byte_Buffer (1 .. 22);
begin
BlockRead (stream, eb);
Copy_and_check (eb, the_end);
end Read_and_check;
-- Some explanations - GdM 2001
-- The idea is that the .ZIP can be appended to an .EXE, for
-- self - extracting purposes. So, the most general infos are
-- at the end, and we crawl back for more precise infos:
-- 1) end - of - central directory
-- 2) central directory
-- 3) zipped files
procedure Load (stream : Zipstream_Class;
the_end : out End_of_Central_Dir) is
end_buffer : Byte_Buffer (1 .. 22);
min_end_start : Ada.Streams.Stream_IO.Count;
use Ada.Streams.Stream_IO;
max_comment : constant := 65_535;
begin
-- 20 - Jun - 2001 : abandon search below min_end_start
-- - read about max comment length in appnote
if Size (stream) <= max_comment then
min_end_start := 1;
else
min_end_start := Ada.Streams.Stream_IO.Count (Size (stream)) - max_comment;
end if;
-- Yes, we must _search_ for it .. .
-- because PKWARE put a variable - size comment _after_ it 8 - (
for i in reverse min_end_start .. Ada.Streams.Stream_IO.Count (Size (stream)) - 21 loop