bex

# Zoe Phin, 2021/04/24
# https://phzoe.com/?p=1761

wget -O- http://flatassembler.net/fasm-1.73.27.tgz | tar zx fasm/fasm

echo '          use32
    org         0x505A4000

    db          0x7F, "ELF"
    dd          1
    dd          0
    dd          $$
    dw          2
    dw          3
    dd          start
    dd          start
    dd          4

    start:      pop     ecx
                pop     edi
                jmp     .end

    .arg:       pop     esi

        .char:  lodsb
                cmp     al, 0
                jmp     .cont

    dw          32
    dd          1

        .cont:  je      .done
                rcr     al, 1
                adc     ah, ah
                jmp     .char

        .done:  mov     [edi+edx], ah
                inc     edx
                xor     eax,eax

    .end:       loop    .arg
                jmp     edi

' > bex.asm; fasm/fasm bex.asm bex; chmod +x bex

input="10110000 00000100 01000011 10001001 11111001 11001101 10000000 10010011 11001101 10000000"

output=$(./bex $input | xxd -b -c10 | cut -c11-99)

echo "Input:  $input"
echo "Output: $output"

[[ $input = $output ]] && echo "Match!" || echo "Error: No Match"