Inferno #05 30 апреля 2004

Программирование

Softinka - Packer RGB images Powerful Code Decreaser v6.2.

 Powerful Code Decreaser v6.2



   Packer at one time was used
for compression of RGB image (. Y). Perhaps they
pack a lot of magazines. Perhaps it is
there appeared a standard tree of 16
options, which subsequently ended up in MS
Pack, Hrum, Hrust ... Not claim
nothing ...


   Included with the compressor attached
unpack in the source code. This solves many problems, giving 
the opportunity to choose how use the extractor. Unpacking not 
optimized, but the presence of the source allows us to solve 
this issue. 

   There is bit and byte streams, bit stream is selected by 2 
bytes. To work uses a stack (the principle DJNZ: POP HL: LD B, 
C: ADD HL, HL). 

   Packed block starts with a 5-byte
related to the end of the file, then lay 2
first bytes of the bitstream.

   Further, according to the bit stream:

% 1 - just bytes (of a byte stream);
 % 000, xxxx - puts = 1. Ultrashort link with
 disp = xxxx +1 = 1 .. 16;
 001% - puts = 2. Slug, dispL Math
  patterns from a byte stream. If -1, then

  exit unpacker, otherwise dispL on the unit per unit more than 
reading;  010% - puts = 3. Here and below follows:

  Thus defined disp: from byte to
  current read dispL, and dispH of Bito
  flux on a tree:

   % 0 - dispH = 0,

   % 1000 - dispH = 1,

   % 1010 - dispH = 2,

   % 1100 - dispH = 3,

   % 1110 - dispH = 4,

   % 1011000 - dispH = 5,

  etc. Codes begin with the unit and have

  structure: 2 information bits, 1 bit

  terminator (0 = end) and t.d.Do

  8 bits dispH. Major drawback - Sauveur
  Shannon does not use codes starting with
 % 1001 ...
% 01101 - puts = 4;
% 01110 - puts = 5;
% 0111100 - puts = 6;
% 0111101 - puts = 7;
% 0111110 - puts = 8;
011111100% - puts = 9;
011111101% - puts = 10;
011111110% - puts = 11;
01111111100% - puts = 12;
01111111101% - puts = 13;
01111111110% - puts = 14;
01111111111% - puts = 15;
 % 01,100 - to take a byte from byte to
  current. If 0, then take 2 bytes puts out
 byte stream, or puts = byte +15.


                       Prepared by Coder