6502/lzsa
1
0
Fork 0
mirror of https://github.com/emmanuel-marty/lzsa.git synced 2024-11-19 16:31:31 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #7 from peterferrie/master - thanks again!

Browse Source 
a little more
This commit is contained in:
Emmanuel Marty 2019-07-08 09:17:30 +02:00 committed by GitHub
commit 0c5bc1d218
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
asm/8088/decompress_small_v1.S
View File

@ -92,17 +92,13 @@ lzsa1_decompress:
lodsw ; grab 16-bit length lodsw ; grab 16-bit length
test ax,ax ; bail if we hit EOD test ax,ax ; bail if we hit EOD
jne short .got_matchlen je short .done_decompressing
.done_decompressing:
pop ax ; retrieve the original decompression offset
xchg ax,di ; compute decompressed size
sub ax,di
ret ; done
db 81H ; mask inc ah/lodsb
; (*like jmp short .got_literals but faster)
.mid_matchlen: .mid_matchlen:
lodsb ; grab single extra length byte
inc ah ; add 256 inc ah ; add 256
lodsb ; grab single extra length byte
.got_matchlen: .got_matchlen:
xchg cx,ax ; copy match length into cx xchg cx,ax ; copy match length into cx
@ -116,3 +112,9 @@ lzsa1_decompress:
xchg si,ax ; restore ds:si xchg si,ax ; restore ds:si
pop ds pop ds
jmp short .decode_token ; go decode another token jmp short .decode_token ; go decode another token
.done_decompressing:
pop ax ; retrieve the original decompression offset
xchg ax,di ; compute decompressed size
sub ax,di
ret ; done