decompress.asm

mov bx, daddr
mov es, bx
mov ds, bx

; Read from disk
mov ax, 0x0204
mov cx, 0x0002
mov dh, 0
mov bx, compressed
int 13h

xor ax, ax
mov bx, ax
mov cx, ax
mov dx, ax

mov si, compressed
mov di, image

readcommand:
    lodsb

    cmp si, compressed+compsize
    jae startanimation

    cmp al, 128
    jae newdata
    jmp olddata

newdata:
    and al, 127
    mov cl, al

    newnextbyte:
        lodsb
        stosb

        dec cl
        cmp cl, -1
        jne newnextbyte

        jmp readcommand

olddata:
    mov ah, al
    lodsb

    mov bx, ax
    lodsb

    mov dx, si
    mov si, bx
    add si, image
    mov cl, al

    oldnextbyte:
        lodsb
        stosb

        dec cl
        cmp cl, 0
        jne oldnextbyte

        mov si, dx
        jmp readcommand