Fast ZIP (Deflate) unpacking - Page 4

h0ffman · Yesterday, 22:07

Evening. Sorry for the necro posting but I was having a play with inflate today and found a bit of an issue.

I'm trying to use the option OPT_PREGENERATE_TABLES = 1 as I'll have multiple small files to unpack.

In this mode it says call inflate_gentables with A6 pointing to the end of a 6000 byte block. Problem is it seems to reference a4 pretty quickly which isn't set by anything? Of course the whole thing crashes here.

Tried setting the off stack storage but that didn't help.

Any ideas?

Code:

inflate_gentables:
                             movem.l                      a5-a6,-(sp)
                             lea                          pregen_dummy_block(pc),a5
                             bsr                          inflate                                           ; static block
                             lea                          -3000(aS),aS
                             lea                          pregen_dummy_block(pc),a5
                             bsr                          inflate                                           ; dynamic block
                             movem.l                      (sp)+,a5-a6
                             rts

Code:

inflate:
                             movem.l                      d0-d6/a0-a5,-(aS)

                             lea                          start_of_buffer(pc),a0
                             move.l                       a4,(a0)

h0ffman · Yesterday, 22:24

OK, maybe ignore me, seems there is a newer version I just found.

Yesterday, 22:07	#61
h0ffman Registered User Join Date: Aug 2008 Location: Salisbury Posts: 784	Evening. Sorry for the necro posting but I was having a play with inflate today and found a bit of an issue. I'm trying to use the option OPT_PREGENERATE_TABLES = 1 as I'll have multiple small files to unpack. In this mode it says call inflate_gentables with A6 pointing to the end of a 6000 byte block. Problem is it seems to reference a4 pretty quickly which isn't set by anything? Of course the whole thing crashes here. Tried setting the off stack storage but that didn't help. Any ideas? Code: inflate_gentables: movem.l a5-a6,-(sp) lea pregen_dummy_block(pc),a5 bsr inflate ; static block lea -3000(aS),aS lea pregen_dummy_block(pc),a5 bsr inflate ; dynamic block movem.l (sp)+,a5-a6 rts Code: inflate: movem.l d0-d6/a0-a5,-(aS) lea start_of_buffer(pc),a0 move.l a4,(a0)

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Yesterday, 22:24	#62
h0ffman Registered User Join Date: Aug 2008 Location: Salisbury Posts: 784	OK, maybe ignore me, seems there is a newer version I just found.

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