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"][" & U8'Image(temp) & ']'
);
end if;
case separator is
when ',' => -- 16#2C#
exit;
-- Image descriptor will begin
-- See: 20. Image Descriptor
when ';' => -- 16#3B#
if full_trace then
Ada.Text_IO.Put(" - End of GIF");
end if;
image.next_frame:= 0.0;
next_frame:= image.next_frame;
return; -- End of GIF image
when '!' => -- 16#21# Extensions
if full_trace then
Ada.Text_IO.Put(" - Extension");
end if;
Get_Byte(image.buffer, label );
Raw_Byte (label);
case label is
when 16#F9# => -- See: 23. Graphic Control Extension
if full_trace then
Ada.Text_IO.Put_Line(" - 16#F9#: Graphic Control Extension");
end if;
Get_Byte(image.buffer, temp );
Raw_Byte(temp);
if temp /= 4 then
Raise_Exception(
error_in_image_data'Identity,
"GIF: error in Graphic Control Extension"
);
end if;
Get_Byte(image.buffer, temp );
Raw_Byte(temp);
-- Reserved 3 Bits
-- Disposal Method 3 Bits
-- User Input Flag 1 Bit
-- Transparent Color Flag 1 Bit
frame_transparency:= (temp and 1) = 1;
Read_Intel(image.buffer, delay_frame);
image.next_frame:=
image.next_frame + Ada.Calendar.Day_Duration(delay_frame) / 100.0;
next_frame:= image.next_frame;
Get_Byte(image.buffer, temp );
Raw_Byte(temp);
Transp_color:= Color_type(temp);
-- zero sub-block:
Get_Byte(image.buffer, temp );
Raw_Byte(temp);
when 16#FE# => -- See: 24. Comment Extension
if full_trace then
Ada.Text_IO.Put_Line(" - 16#FE#: Comment Extension");
sub_blocks_sequence:
loop
Get_Byte(image.buffer, temp ); -- load sub-block length byte
Raw_Byte(temp);
exit sub_blocks_sequence when temp = 0;
-- null sub-block = end of sub-block sequence
for i in 1..temp loop
Get_Byte(image.buffer, temp2);
Raw_Byte(temp2);
c:= Character'Val(temp2);
Ada.Text_IO.Put(c);
end loop;
end loop sub_blocks_sequence;
Ada.Text_IO.New_Line;
else
Skip_sub_blocks;
end if;
when 16#01# => -- See: 25. Plain Text Extension
if full_trace then
Ada.Text_IO.Put_Line(" - 16#01#: Plain Text Extension");
end if;
Skip_sub_blocks;
when 16#FF# => -- See: 26. Application Extension
if full_trace then
Ada.Text_IO.Put_Line(" - 16#FF#: Application Extension");
end if;
Skip_sub_blocks;
when others =>
if full_trace then
Ada.Text_IO.Put_Line(" - Unused extension:" & U8'Image(label));
end if;
Skip_sub_blocks;
end case;
when ASCII.NUL =>
-- Occurs in some buggy GIFs (2016).
-- Seems a 2nd zero, the 1st marking the end of sub-block list.
if full_trace then
Ada.Text_IO.Put_Line(" - Wrong separator, skip and hope for the better...");
end if;
when others =>
Raise_Exception(
error_in_image_data'Identity,
"Unknown GIF separator: [" & separator &
"] code:" & Integer'Image(Character'Pos(separator))
);
end case;