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ada-git-code

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El := B (256);
else
El := B_Max;
end if;
-- Generate counts for each bit length
for K in B'Range loop
if B (K) > B_Max then
-- m := 0; -- GNAT 2005 doesn't like it (warning).
raise Huft_Error;
end if;
Count (B (K)) := Count (B (K)) + 1;
end loop;
if Count (0) = B'Length then
M := 0;
Huft_Incomplete := False; -- Spotted by Tucker Taft, 19-Aug-2004
return; -- Complete
end if;
-- Find minimum and maximum length, bound m by those
J := 1;
while J <= B_Max and then Count (J) = 0 loop
J := J + 1;
end loop;
Kcc := J;
if M < J then
M := J;
end if;
I := B_Max;
while I > 0 and then Count (I) = 0 loop
I := I - 1;
end loop;
G := I;
if M > I then
M := I;
end if;
-- Adjust last length count to fill out codes, if needed
Y := Integer (Shift_Left (Unsigned_32'(1), J)); -- y:= 2 ** j;
while J < I loop
Y := Y - Count (J);
if Y < 0 then
raise Huft_Error;
end if;
Y := Y * 2;
J := J + 1;
end loop;
Y := Y - Count (I);
if Y < 0 then
raise Huft_Error;
end if;
Count (I) := Count (I) + Y;
-- Generate starting offsets into the value table for each length
Offset (1) := 0;
J := 0;
for Idx in 2 .. I loop
J := J + Count (Idx - 1);
Offset (Idx) := J;
end loop;
-- Make table of values in order of bit length
for Idx in B'Range loop
J := B (Idx);
if J /= 0 then
V (Offset (J)) := Idx - B'First;
Offset (J) := Offset (J) + 1;
end if;
end loop;
-- Generate huffman codes and for each, make the table entries
Code_Stack (0) := 0;
I := 0;
V_Idx := V'First;
Bits (-1) := 0;
-- Go through the bit lengths (kcc already is bits in shortest code)
for K in Kcc .. G loop
for Am1 in reverse 0 .. Count (K) - 1 loop -- A counts codes of length k
-- Here i is the huffman code of length k bits for value v(v_idx)
while K > W + Bits (Table_Level) loop
W := W + Bits (Table_Level); -- Length of tables to this position
Table_Level := Table_Level + 1;
Z := G - W; -- Compute min size table <= m bits
if Z > M then
Z := M;
end if;
J := K - W;
F := Integer (Shift_Left (Unsigned_32'(1), J)); -- f:= 2 ** j;
if F > Am1 + 2 then
-- Try a k-w bit table
F := F - (Am1 + 2);