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-- 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);
c_idx:= k;
loop -- Try smaller tables up to z bits
j:= j + 1;
exit when j >= z;
f := f * 2;
c_idx:= c_idx + 1;
exit when f - count(c_idx) <= 0;
f:= f - count(c_idx);
end loop;
end if;
if w + j > el and then w < el then
j:= el - w; -- Make EOB code end at table
end if;
if w = 0 then
j := m; -- Fix: main table always m bits!
end if;
z:= Integer(Shift_Left(Unsigned_32'(1), j)); -- z:= 2 ** j;
bits(table_level) := j;
-- Allocate and link new table
begin
current_table_ptr := new HufT_table ( 0..z );
new_node_ptr := new Table_list'( current_table_ptr, null );
exception
when Storage_Error =>
raise huft_out_of_memory;
Function Definition: procedure Big_endian is new Big_endian_number( U32 );
Function Body: use Ada.Exceptions;
----------
-- Read --
----------
procedure Read (image: in out Image_descriptor; ch: out Chunk_head) is
str4: String(1..4);
b: U8;
begin
Big_endian(image.buffer, ch.length);
for i in str4'Range loop
Buffering.Get_Byte(image.buffer, b);
str4(i):= Character'Val(b);
end loop;
begin
ch.kind:= PNG_Chunk_tag'Value(str4);
if some_trace then
Ada.Text_IO.Put_Line(
"Chunk [" & str4 &
"], length:" & U32'Image(ch.length)
);
end if;
exception
when Constraint_Error =>
Raise_Exception(
error_in_image_data'Identity,
"PNG chunk unknown: " &
Integer'Image(Character'Pos(str4(1))) &
Integer'Image(Character'Pos(str4(2))) &
Integer'Image(Character'Pos(str4(3))) &
Integer'Image(Character'Pos(str4(4))) &
" (" & str4 & ')'
);
Function Definition: procedure Prepare_table is
Function Body: -- CRC-32 algorithm, ISO-3309
Seed: constant:= 16#EDB88320#;
l: Unsigned_32;
begin
for i in CRC32_Table'Range loop
l:= i;
for bit in 0..7 loop
if (l and 1) = 0 then
l:= Shift_Right(l,1);
else
l:= Shift_Right(l,1) xor Seed;
end if;
end loop;
CRC32_Table(i):= l;
end loop;
end Prepare_table;
procedure Update( CRC: in out Unsigned_32; InBuf: Byte_array ) is
local_CRC: Unsigned_32;
begin