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thechaingamer
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ada-git-code

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if Start > From then
-- put_line(from'img & to'img & start'img);
declare
Copy_From : Lz_Buffer_Index_Type := Start;
Copy : Lz_Buffer_Type (0 .. Slider_Max);
begin
for I in Copy'Range loop
Copy (I) := Lz_Buffer (Copy_From);
Copy_From := Copy_From + 1; -- Loops over (mod n)
end loop;
Initial_Hd := Build_Descriptors (Copy);
Function Definition: procedure Encode is
Function Body: X_Percent : Natural;
Bytes_In : Natural; -- Count of input file bytes processed
User_Aborting : Boolean;
Pctdone : Natural;
function Read_Byte return Byte is
B : Byte;
begin
B := Inbuf (Inbufidx);
Inbufidx := Inbufidx + 1;
Zip.CRC.Update (CRC, (1 => B));
Bytes_In := Bytes_In + 1;
if Feedback /= null then
if Bytes_In = 1 then
Feedback (0, User_Aborting);
end if;
if X_Percent > 0
and then ((Bytes_In - 1) mod X_Percent = 0 or Bytes_In = Integer (Input_Size))
then
Pctdone := Integer ((100.0 * Float (Bytes_In)) / Float (Input_Size));
Feedback (Pctdone, User_Aborting);
if User_Aborting then
raise User_Abort;
end if;
end if;
end if;
return B;
end Read_Byte;
function More_Bytes return Boolean is
begin
if Inbufidx > Maxinbufidx then
Read_Block;
end if;
return not Inputeof;
end More_Bytes;
-- LZ77 parameters
Look_Ahead : constant Integer := 258;
String_Buffer_Size : constant := 2**15; -- Required: 2**15 for Deflate, 2**16 for Deflate_e
type Text_Buffer_Index is mod String_Buffer_Size;
type Text_Buffer is array (Text_Buffer_Index) of Byte;
Text_Buf : Text_Buffer;
R : Text_Buffer_Index;
-- If the DLE coding doesn't fit the format constraints, we need
-- to decode it as a simple sequence of literals. The buffer used is
-- called "Text" buffer by reference to "clear-text", but actually it
-- is any binary data.
procedure Lz77_Emits_Dl_Code (Distance, Length : Integer) is
-- NB: no worry, all arithmetics in Text_buffer_index are modulo String_buffer_size
B : Byte;
Copy_Start : Text_Buffer_Index;
Expand : Expanded_Data;
Ie : Positive := 1;
begin
if Distance =
String_Buffer_Size
then -- Happens with 7-Zip, cannot happen with Info-Zip
Copy_Start := R;
else
Copy_Start := R - Text_Buffer_Index (Distance);
end if;
-- Expand into the circular text buffer to have it up to date
for K in 0 .. Text_Buffer_Index (Length - 1) loop
B := Text_Buf (Copy_Start + K);
Text_Buf (R) := B;
R := R + 1;
if Ie <= Max_Expand then -- Also memorize short sequences for LZ buffer
Expand (Ie) := B; -- for the case a block needs to be stored in clear
Ie := Ie + 1;
end if;
end loop;
if Distance in Distance_Range and Length in Length_Range then
Put_Or_Delay_Dl_Code (Distance, Length, Expand);
else
for K in 0 .. Text_Buffer_Index (Length - 1) loop
Put_Or_Delay_Literal_Byte (Text_Buf (Copy_Start + K));
end loop;
end if;
end Lz77_Emits_Dl_Code;
procedure Lz77_Emits_Literal_Byte (B : Byte) is
begin
Text_Buf (R) := B;
R := R + 1;