CopyProtection

Game downloaded from AbandonWareFrance is already patched to avoid copy protection questions, that's sad for someone who want to study the protection, so here is the original code :

Original code from SKIEGA unpacked version :

seg000:0532                 mov     byte_1EE21, 1Ch
seg000:0537                 push    es
seg000:0538                 mov     ax, OffsetDataRead
...
seg000:054F                 mov     bCopyProtection, 0
seg000:0554                 mov     bCopyProtection2, 0
seg000:0559
seg000:0559 loc_10559:
seg000:0559                 mov     al, ColorBlack

Patched (cracked?) version :

seg000:0532                 jmp     short loc_1054F
seg000:0534 ; ---------------------------------------------------------------------------
seg000:0534                 xchg    ax, cx
seg000:0535                 insb
seg000:0536                 sbb     al, 6
...
seg000:054F                 mov     bCopyProtection, 1
seg000:0554                 mov     bCopyProtection2, 1
seg000:0559
seg000:0559 locret_10559:
seg000:0559                 retn

Code for copy protection

: "AP"
: "BB"
: "GP"
: "ST"
: "PZ"
: "AS"
: "GM"
: "KB"
: "BA"
: "MT"

Files Information

Files uses the extension ".lzw", but the compression algorithm is LZSS !

All images must be fliped horizontaly.

"*BM.LZW"

SBFBM.LZW ; DHFBM.LZW ; SFFBM.LZW ; TBFBM.LZW ; AJFBM.LZW ; MNFBM.LZW

Multiple sprites of 4-Bit image

+0x00 : Width
+0x01 : Height
+0x02 : Data

Data Layout for each row (X * height) :

+0x00 : Gap Start X position
+0x01 : Number of pixels
+0x02 : 4-bit color <Number of pixels * 0x02>

Example

Entry 17 (0x11) of the file "MNFBM.LZW"

[    0000]   0E 1A 00 0C CC CC CC CC   CC CC CC CC CC CC CC CC   ........ ........
[    0010]   00 0C CC 99 99 99 C9 9C   CC 99 CC 99 99 CC 00 0C   ........ ........
[    0020]   C9 91 11 11 C9 9C C9 91   CC 19 91 CC 00 0C C1 99   ........ ........
[    0030]   99 9C C9 99 99 1C CC C9   9C CC 00 0E CC 11 11 99   ........ ........
[    0040]   C9 91 19 9C CC C9 9C CC   44 00 00 0E C9 99 99 91   ........ D.......
[    0050]   C9 9C C1 99 CC 99 99 CC   44 00 00 0E C1 11 11 1C   ........ D.......
[    0060]   C1 1C CC 11 CC 11 11 CC   44 00 00 0E CC CC CC CC   ........ D.......
[    0070]   CC CC CC CC CC CC CC CC   44 00 00 0E CC CC CC C8   ........ D.......
[    0080]   7C CC CC CC CC CC CC CC   44 00 00 0E CC CC CC 88   |....... D.......
[    0090]   87 CC C9 99 99 9C CC CC   44 00 00 0E CC CC C8 88   ........ D.......
[    00a0]   88 7C C9 91 11 99 CC CC   44 00 00 0E CC CC 88 88   .|...... D.......
[    00b0]   88 87 C9 99 99 91 CC CC   44 00 00 0E CC CC 88 88   ........ D.......
[    00c0]   88 87 C9 91 11 99 CC CC   44 00 00 0E CC CC C8 88   ........ D.......
[    00d0]   88 7C C9 9C CC 99 CC CC   44 00 00 0E CC CC CC 88   .|...... D.......
[    00e0]   87 CC C1 1C CC 11 CC CC   44 00 00 0E CC CC CC C8   ........ D.......
[    00f0]   7C CC CC CC CC CC CC CC   44 00 00 0E CC CC CC CC   |....... D.......
[    0100]   CC CC CC CC CC CC CC CC   44 00 00 0E C9 99 99 9C   ........ D.......
[    0110]   C9 99 9C C9 99 99 99 CC   44 00 00 0E C9 91 11 99   ........ D.......
[    0120]   C1 99 1C C9 91 11 11 CC   44 00 00 0E C9 9C CC 99   ........ D.......
[    0130]   CC 99 CC C9 99 99 CC CC   44 00 00 0E C9 9C CC 99   ........ D.......
[    0140]   CC 99 CC C9 91 11 CC CC   44 00 00 0E C9 99 99 91   ........ D.......
[    0150]   C9 99 9C C9 99 99 99 CC   44 00 00 0E C1 11 11 1C   ........ D.......
[    0160]   C1 11 1C C1 11 11 11 CC   44 00 00 0E CC CC CC CC   ........ D.......
[    0170]   CC CC CC CC CC CC CC CC   44 00 01 0C 44 44 44 44   ........ D...DDDD
[    0180]   44 44 44 44 44 44 44 44   01 0C 44 44 44 44 44 44   DDDDDDDD ..DDDDDD
[    0190]   44 44 44 44 44 44                                   DDDDDD

Widht = 0x0E * 2
Height = 0x1A

Row 0 :

Gap = 0x00
Number of pixels : 0x0C * 2

Gap, pixels, data pixels :

00 0C CC CC CC CC CC CC CC CC CC CC CC CC

Row 1, 2, 3, 4 :

00 0C CC 99 99 99 C9 9C CC 99 CC 99 99 CC
00 0C C9 91 11 11 C9 9C C9 91 CC 19 91 CC
00 0C C1 99 99 9C C9 99 99 1C CC C9 9C CC
00 0E CC 11 11 99 C9 91 19 9C CC C9 9C CC 44 00

etc ...

"TIL.LZW" | "TILE.LZW"

AJTIL.LZW ; DHTIL.LZW ; TBTIL.LZW ; DHTILE.LZW

+0x00 : Number of entry
+0x02 : unk1
+0x04 : Data

4-Bit images with fixed height to 8 and width to 4.

"*MAP.LZW"

AJMAP.LZW ; DHMAP.LZW ; TBMAP.LZW

List of reference to TIL images

Example "AJMAP.LZW"

[    0060]   01 00 06 00 01 00 01 00   07 00 01 00 08 00 01 00   ........ ........

TIL 0x0001 ; 0x0006 ; 0x0001 ; 0x0001 ; 0x0007 ; 0x0001 ; 0x0008 ; 0x0001 ... etc

SPLASH.LZW

4-Bit image for SplashScreen.

MNSHP.LZE

0xB (11) 4-Bit image used for ski station animation (3 for "Rodney's" sign, 8 for ski lift).

HISCORE.LZW

4-Bit image for HighScores screen

TSQUARE.LZW

4-Bit image for ski resort

DHSHP.LZW

0xA (10) 4-Bit image for .... (TODO)

SBSHP.LZW

0x12 (18) 4-Bit image for ... (TODO)

SHOP.LZW

4-Bit image for Main Screen

SFSHP.LZW

0x17 (23) 4-Bit image for ... (TODO)

ACROJUMP.LZW

4-Bit image for Acro Aerials game

SNOWFORT.LZW

4-Bit image for Snowball Blast game

SBTUBE.LZW

4-Bit image for for SnowBoard HalfPipe game

AJSHP.LZW

0x16 (22) 4-Bit image for ... (TODO)

TBSHP.LZW

0x7 (7) 4-Bit image for ... (TODO)

SIGNUP.LZW

4-Bit image to SignIn competition

CPSHP.LZW

0x9 (9) 4-Bit image usef for game protection ... TODO

w4kfu/SkiOrDie