text stringlengths 0 234 |
|---|
UnZ_Glob.slide ( UnZ_Glob.slide_index ) := |
U8( UnZ_IO.Bit_buffer.Read_and_dump(8) ); |
UnZ_Glob.slide_index:= UnZ_Glob.slide_index + 1; |
UnZ_IO.Flush_if_full(UnZ_Glob.slide_index); |
end loop; |
if full_trace then |
Ada.Text_IO.Put_Line("End Inflate_stored_block"); |
end if; |
end Inflate_stored_block; |
-- Copy lengths for literal codes 257..285 |
copy_lengths_literal : Length_array( 0..30 ) := |
( 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, |
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 ); |
-- Extra bits for literal codes 257..285 |
extra_bits_literal : Length_array( 0..30 ) := |
( 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, |
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, invalid, invalid ); |
-- Copy offsets for distance codes 0..29 (30..31: deflate_e) |
copy_offset_distance : constant Length_array( 0..31 ) := |
( 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, |
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, |
8193, 12289, 16385, 24577, 32769, 49153 ); |
-- Extra bits for distance codes |
extra_bits_distance : constant Length_array( 0..31 ) := |
( 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, |
7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14 ); |
max_dist: Integer:= 29; -- changed to 31 for deflate_e |
procedure Inflate_fixed_block is |
Tl, -- literal/length code table |
Td : p_Table_list; -- distance code table |
Bl, Bd : Integer; -- lookup bits for tl/bd |
huft_incomplete : Boolean; |
-- length list for HufT_build (literal table) |
L: constant Length_array( 0..287 ):= |
( 0..143=> 8, 144..255=> 9, 256..279=> 7, 280..287=> 8); |
begin |
if full_trace then |
Ada.Text_IO.Put_Line("Begin Inflate_fixed_block"); |
end if; |
-- make a complete, but wrong code set |
Bl := 7; |
HufT_build( |
L, 257, copy_lengths_literal, extra_bits_literal, |
Tl, Bl, huft_incomplete |
); |
-- Make an incomplete code set |
Bd := 5; |
begin |
HufT_build( |
(0..max_dist => 5), 0, |
copy_offset_distance, extra_bits_distance, |
Td, Bd, huft_incomplete |
); |
if huft_incomplete then |
if full_trace then |
Ada.Text_IO.Put_Line( |
"td is incomplete, pointer=null: " & |
Boolean'Image(Td=null) |
); |
end if; |
end if; |
exception |
when huft_out_of_memory | huft_error => |
HufT_free( Tl ); |
raise error_in_image_data; |
Function Definition: procedure Inflate_dynamic_block is |
Function Body: bit_order : constant array ( 0..18 ) of Natural := |
( 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 ); |
Lbits : constant:= 9; |
Dbits : constant:= 6; |
current_length: Natural:= 0; |
defined, number_of_lengths: Natural; |
Tl, -- literal/length code tables |
Td : p_Table_list; -- distance code tables |
CT_dyn_idx : Integer; -- current table element |
Bl, Bd : Integer; -- lookup bits for tl/bd |
Nb : Natural; -- number of bit length codes |
Nl : Natural; -- number of literal length codes |
Nd : Natural; -- number of distance codes |
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