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init_crc_table:

        xor     edx, edx

        mov     edi, crc_table

.1:

        mov     ecx, 8

        mov     eax, edx

.2:

        shr     eax, 1

        jnc     @f

        xor     eax, 0xEDB88320

@@:

        loop    .2

        stosd

        inc     dl

        jnz     .1

        ret

crc:

; in: ecx=size, esi->buffer

; out: eax=crc

        or      eax, -1

        jecxz   .end

.loop:

        movzx   edx, al

        xor     dl, byte [esi]

        inc     esi

        shr     eax, 8

        xor     eax, [crc_table+edx*4]

        loop    .loop

.end:

        xor     eax, -1

        ret