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if some_trace then
Put_Line(
" Restart #" & U16'Image(nextrst) &
" Code " & U16'Image(w) &
" after" & Natural'Image(image.JPEG_stuff.restart_interval) &
" macro blocks"
);
end if;
if w not in 16#FFD0# .. 16#FFD7# or (w and 7) /= nextrst then
Raise_Exception(
error_in_image_data'Identity,
"JPEG: expected RST (restart) marker Nb " & U16'Image(nextrst)
);
end if;
nextrst:= (nextrst + 1) and 7;
rstcount:= image.JPEG_stuff.restart_interval;
-- Block-to-block predictor variables are reset.
for c in Component loop
info_B(c).dcpred:= 0;
end loop;
end if;
end if;
end loop macro_blocks_loop;
Function Definition: procedure Dispose is new
Function Body: Ada.Unchecked_Deallocation( HufT_table, p_HufT_table );
procedure Dispose is new
Ada.Unchecked_Deallocation( Table_list, p_Table_list );
current: p_Table_list;
tcount : Natural:= 0; -- just a stat. Idea: replace table_list with an array
tot_length: Natural:= 0;
begin
if full_trace then
Ada.Text_IO.Put("[HufT_Free... ");
end if;
while tl /= null loop
if full_trace then
tcount:= tcount+1;
tot_length:= tot_length + tl.table'Length;
end if;
Dispose( tl.table ); -- destroy the Huffman table
current:= tl;
tl := tl.next;
Dispose( current ); -- destroy the current node
end loop;
if full_trace then
Ada.Text_IO.Put_Line(
Integer'Image(tcount)& " tables, of" &
Integer'Image(tot_length)& " tot. length]"
);
end if;
end HufT_free;
-- Build huffman table from code lengths given by array b
procedure HufT_build ( b : Length_array;
s : Integer;
d, e : Length_array;
tl : out p_Table_list;
m : in out Integer;
huft_incomplete : out Boolean)
is
b_max : constant:= 16;
b_maxp1: constant:= b_max + 1;
-- bit length count table
count : array( 0 .. b_maxp1 ) of Integer:= (others=> 0);
f : Integer; -- i repeats in table every f entries
g : Integer; -- max. code length
i, -- counter, current code
j : Integer; -- counter
kcc : Integer; -- number of bits in current code
c_idx, v_idx: Natural; -- array indices
current_table_ptr : p_HufT_table:= null;
current_node_ptr : p_Table_list:= null; -- curr. node for the curr. table
new_node_ptr : p_Table_list; -- new node for the new table
new_entry: HufT; -- table entry for structure assignment
u : array( 0..b_max ) of p_HufT_table; -- table stack
n_max : constant:= 288;
-- values in order of bit length
v : array( 0..n_max ) of Integer:= (others=> 0);
el_v, el_v_m_s: Integer;
w : Natural:= 0; -- bits before this table
offset, code_stack : array( 0..b_maxp1 ) of Integer;
table_level : Integer:= -1;
bits : array( Integer'(-1)..b_maxp1 ) of Integer;
-- ^bits(table_level) = # bits in table of level table_level
y : Integer; -- number of dummy codes added