diff options
Diffstat (limited to 'home/decompress.asm')
| -rw-r--r-- | home/decompress.asm | 31 |
1 files changed, 8 insertions, 23 deletions
diff --git a/home/decompress.asm b/home/decompress.asm index 5e36d828..1d555529 100644 --- a/home/decompress.asm +++ b/home/decompress.asm @@ -1,4 +1,4 @@ -FarDecompress:: ; b40 +FarDecompress:: ; Decompress graphics data from a:hl to de. ld [wLZBank], a @@ -12,10 +12,8 @@ FarDecompress:: ; b40 pop af rst Bankswitch ret -; b50 - -Decompress:: ; b50 +Decompress:: ; Pokemon Gold and Silver use an lz variant for compression. ; This is mainly (but not necessarily) used for graphics. @@ -34,13 +32,11 @@ LZ_LEN EQU %00011111 ; length n (bits 0-4) ; Commands: - LZ_LITERAL EQU 0 << 5 ; Read literal data for n bytes. LZ_ITERATE EQU 1 << 5 ; Write the same byte for n bytes. LZ_ALTERNATE EQU 2 << 5 ; Alternate two bytes for n bytes. LZ_ZERO EQU 3 << 5 ; Write 0 for n bytes. - ; Another class of commands reuses data from the decompressed output. LZ_RW EQU 2 + 5 ; bit @@ -125,7 +121,6 @@ LZ_LONG_HI EQU %00000011 ; read at least 1 byte inc c - .command ; Increment loop counts. ; We bail the moment they hit 0. @@ -144,7 +139,6 @@ LZ_LONG_HI EQU %00000011 cp LZ_ZERO jr z, .Zero - .Literal ; Read literal data for bc bytes. .lloop @@ -159,8 +153,7 @@ LZ_LONG_HI EQU %00000011 inc de jr .lloop - -.Iter +.Iter: ; Write the same byte for bc bytes. ld a, [hli] @@ -175,8 +168,7 @@ LZ_LONG_HI EQU %00000011 inc de jr .iloop - -.Alt +.Alt: ; Alternate two bytes for bc bytes. dec c jr nz, .anext1 @@ -205,8 +197,7 @@ LZ_LONG_HI EQU %00000011 inc hl jr .Main - -.Zero +.Zero: ; Write 0 for bc bytes. xor a @@ -221,7 +212,6 @@ LZ_LONG_HI EQU %00000011 inc de jr .zloop - .rewrite ; Repeat decompressed data from output. push hl @@ -275,8 +265,7 @@ LZ_LONG_HI EQU %00000011 ; More practically, LZ_LONG is not recursive. ; For now, it defaults to LZ_REPEAT. - -.Repeat +.Repeat: ; Copy decompressed data for bc bytes. dec c jr nz, .rnext @@ -289,8 +278,7 @@ LZ_LONG_HI EQU %00000011 inc de jr .Repeat - -.Flip +.Flip: ; Copy bitflipped decompressed data for bc bytes. dec c jr nz, .fnext @@ -315,8 +303,7 @@ LZ_LONG_HI EQU %00000011 inc de jr .Flip - -.Reverse +.Reverse: ; Copy reversed decompressed data for bc bytes. dec c jr nz, .rvnext @@ -330,7 +317,6 @@ LZ_LONG_HI EQU %00000011 inc de jr .Reverse - .donerw pop hl @@ -340,4 +326,3 @@ LZ_LONG_HI EQU %00000011 .next inc hl jp .Main -; c2f |