Pwet...

1 files changed, 38 insertions, 4 deletions

diff --git a/FAQ.lz77 b/FAQ.lz77
index 7bd7e0a..65433f6 100644
--- a/FAQ.lz77
+++ b/FAQ.lz77
@@ -119,7 +119,8 @@ A: It's quite easy. The computation formula is the following:
 Q: What are the others parameters?
 A: You have:
 
-     1iscomp   overlap   negative   16bits   opposite
+     1iscomp   overlap   negative   16bits   ptrb
+     filling   inverse   onejump    window
 
    This will change the behaviour of the compression/decompression algorithm.
 
@@ -135,9 +136,24 @@ A: You have:
    using 16 bits words instead of 8 bits words. And thus, the compression
    algorithm is more difficult. As for now, it's broken.
 
-   The opposite behavior is to compute the jump offset in a different way.
-   Instead of taking it as the backward jump value, it will be an offset
-   from the maximum backward jump possible.
+   The ptrb means "pointer behavior". It can take the value 0, 1 or 2. The
+   behavior '0' is the common one: the jump is the number of bytes to
+   count back to find the start of the needle to copy. The '1' is to tell
+   the jump is an offset from the maximum backward jump possible (ie
+   from the start point of the window). The '2' is a very dumb behavior:
+   it tells that the jump is the absolute offset. The window *won't* slide.
+   
+   The filling option activates the RLE behavior.
+   
+   The inverse is a boolean to tell to reverse the order of the bits in the
+   bitmaps
+   
+   The onejump tells to add one to the final jump value. Some streams are
+   shifted by one because by default, a jump of 0 means nothing. So it
+   is dumb to miss one possible backward jump.
+   
+   The window offset tells the absolute window start for the 2th pointer
+   behavior. Yeah, this is necessary. Coders of Metal Max are pretty crazy.
 
 
 
@@ -205,3 +221,21 @@ A: Well, for the decompressor, it's not really necessary, because it won't
    algorithm used by the game *maybe* is able to handle them.
 
 
+
+Q: What is the filling thing?
+A: It's an RLE like behavior. In Valkyrie Profile, when the length hit the
+   maximum value, then it means it's a RLE block, and not a restart block.
+   That's why you've got the eight options:
+
+
+      fmask1  fshft1  fmask2  fshft2  vmask1  vshft1  vmask2  vshft2
+   
+   Basically, they are the same as the {j,l}{mask,shft}{1,2} options, but
+   this time you tell where to find the 'value' which has to be copied,
+   and the 'filling', ie the number of times this value will be copied.
+
+
+Q: What is the 2th filling behaviour?
+A: Get out of here. It's a ugly ugly ugly hack. Forget it. Now!
+
+