.data
    mask:
    .long 0,0,0,0,0,0,0,0,0,0

.text
.type encode, %function
.global encode

#rdi - buf
#rsi - maska
#rdx - operacja
#rcx - character
encode:
    PUSH %rbx
    PUSH %rdi
    PUSH %rsi
    MOV $0, %rbx
createMask:
    PUSH %rsi
    AND $1, %rsi
    CMP $1, %rsi
    JE changeMask
    MOVL $0, mask(, %rbx, 4)
maskChanged:
    POP %rsi
    SHR $1, %rsi
    INC %rbx
    CMP $10, %rbx
    JNE createMask

    XOR %r8, %r8
    MOV %rdi, %rax
    MOV %rdi, %r8
mainLoop:
    CMPB $0, (%rdi)
    JE afterLoop
    CMPB $'0', (%rdi)
    JL noOperation
    CMPB $'9', (%rdi)
    JG noOperation
    CMP $1, %rdx
    JE deleteNumber
    CMP $2, %rdx
    JE transposition
    CMP $3, %rdx
    JE substitute
    JMP noOperation
afterLoop:
    MOV (%rdi), %r9
    MOV %r9, (%r8)
    POP %rsi
    POP %rdi
    POP %rbx
    RET

changeMask:
    MOVL $1, mask(, %rbx, 4)
    JMP maskChanged

noOperation:
    XOR %r10, %r10
    MOVB (%rdi), %r10b
    MOVB %r10b, (%r8)
    INC %rdi
    INC %r8
    JMP mainLoop

deleteNumber:
    XOR %r10, %r10
    MOVB (%rdi), %r10b
    SUBB $'0', %r10b
    CMP $0, mask(,%r10d,4)
    JE noOperation
    INC %rdi
    JMP mainLoop

transposition:
    XOR %r10, %r10
    MOVB (%rdi), %r10b
    SUBB $'0', %r10b
    CMP $0, mask(,%r10d,4)
    JE noOperation
    MOV $9, %r11
    SUB %r10, %r11
    ADD $'0', %r11
    MOVB %r11b, (%r8)
    INC %rdi
    INC %r8
    JMP mainLoop

substitute:
    XOR %r10, %r10
    MOVB (%rdi), %r10b
    SUBB $'0', %r10b
    CMP $0, mask(,%r10d,4)
    JE noOperation
    MOVB %cl, (%r8)
    INC %rdi
    INC %r8
    JMP mainLoop