AssemblerKolo2AJ

/* C:

#include <stdio.h>
char * kodowanie(void *cos, int n);
int main() {
	int znaki[] = { 2045122341 };
	int n = 10;
	char *zakodowane = kodowanie(znaki, 7);


	return 0;
}
*/

// assembler:

.686
.model flat

public _kodowanie
extern _malloc : PROC

.data

znaki db 'ABCDEFGHIJKLMNOP'

.code

_kodowanie PROC

push ebp
mov ebp, esp
mov esi, [ebp+8]
mov ecx, [ebp+12]

mov eax, ecx


push ecx
inc eax
push eax
call _malloc
add esp, 4
pop ecx
mov edi, eax

mov edx, OFFSET znaki
xor eax, eax

shr ecx, 1
jnc dalej

mov al, byte ptr[esi+ecx]
shl ecx, 1
and al, 0F0h
shr al, 4
mov bl, [edx+eax]
mov [edi+ecx], bl
mov [edi+ecx+1], byte ptr 0
shr ecx, 1

dec ecx

dalej:
push eax
mov al, byte ptr[esi+ecx]
shl ecx, 1
and al, 0F0h
shr al, 4
mov bl, [edx+eax]
mov [edi+ecx], bl

shr ecx, 1
pop eax

mov al, byte ptr[esi+ecx]
shl ecx, 1
and al, 0Fh
mov bl, [edx+eax]
mov [edi+ecx+1], bl

shr ecx, 1

dec ecx
cmp ecx, -1
jne dalej

mov eax, edi
pop ebp
ret

_kodowanie ENDP
END