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return b;
end Intel_x86_buffer;
function Intel_bf is new Intel_x86_buffer (Unsigned_16, 2);
function Intel_bf is new Intel_x86_buffer (Unsigned_32, 4);
-------------------
-- PK signatures --
-------------------
function PK_signature (buf : Byte_Buffer; code : Unsigned_8) return Boolean is
(buf (1 .. 4) = (16#50#, 16#4B#, code, code + 1)); -- PK12, PK34, . ..
procedure PK_signature (buf : in out Byte_Buffer; code : Unsigned_8) 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 : Zipstream_Class;
header : out Central_File_Header) is
chb : Byte_Buffer (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)),
short_info =>
(needed_extract_version => Intel_nb (chb (7 .. 8)),
bit_flag => Intel_nb (chb (9 .. 10)),
zip_type => Intel_nb (chb (11 .. 12)),
file_timedate => Zip_Streams.Calendar.Convert (Unsigned_32'(Intel_nb (chb (13 .. 16)))),
dd =>
(crc_32 => Intel_nb (chb (17 .. 20)),
compressed_size => Intel_nb (chb (21 .. 24)),
uncompressed_size => Intel_nb (chb (25 .. 28))),
filename_length => Intel_nb (chb (29 .. 30)),
extra_field_length => Intel_nb (chb (31 .. 32))),
comment_length => Intel_nb (chb (33 .. 34)),
disk_number_start => Intel_nb (chb (35 .. 36)),
internal_attributes => Intel_nb (chb (37 .. 38)),
external_attributes => Intel_nb (chb (39 .. 42)),
local_header_offset => Intel_nb (chb (43 .. 46)));
end Read_and_check;
procedure Write (stream : Zipstream_Class;
header : Central_File_Header) is
chb : Byte_Buffer (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 (Zip_Streams.Calendar.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);
BlockWrite (stream.all, chb);
end Write;
-----------------------------------------------------------------------
-- PKZIP local file header, in front of every file in archive - PK34 --
-----------------------------------------------------------------------
procedure Read_and_check (stream : Zipstream_Class;
header : out Local_File_Header) is
lhb : Byte_Buffer (1 .. 30);
begin
BlockRead (stream, lhb);
if not PK_signature (lhb, 3) then
raise bad_local_header;
end if;
header :=
(needed_extract_version => Intel_nb (lhb (5 .. 6)),