inline ULONG detour_is_code_filler()

in src/UndockedRegFreeWinRT/detours/detours.cpp [237:294]

• 55 lines of code
• 68 McCabe index (conditional complexity)

inline ULONG detour_is_code_filler(PBYTE pbCode)
{
    // 1-byte through 11-byte NOPs.
    if (pbCode[0] == 0x90) {
        return 1;
    }
    if (pbCode[0] == 0x66 && pbCode[1] == 0x90) {
        return 2;
    }
    if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x00) {
        return 3;
    }
    if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x40 &&
        pbCode[3] == 0x00) {
        return 4;
    }
    if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x44 &&
        pbCode[3] == 0x00 && pbCode[4] == 0x00) {
        return 5;
    }
    if (pbCode[0] == 0x66 && pbCode[1] == 0x0F && pbCode[2] == 0x1F &&
        pbCode[3] == 0x44 && pbCode[4] == 0x00 && pbCode[5] == 0x00) {
        return 6;
    }
    if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x80 &&
        pbCode[3] == 0x00 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
        pbCode[6] == 0x00) {
        return 7;
    }
    if (pbCode[0] == 0x0F && pbCode[1] == 0x1F && pbCode[2] == 0x84 &&
        pbCode[3] == 0x00 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
        pbCode[6] == 0x00 && pbCode[7] == 0x00) {
        return 8;
    }
    if (pbCode[0] == 0x66 && pbCode[1] == 0x0F && pbCode[2] == 0x1F &&
        pbCode[3] == 0x84 && pbCode[4] == 0x00 && pbCode[5] == 0x00 &&
        pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00) {
        return 9;
    }
    if (pbCode[0] == 0x66 && pbCode[1] == 0x66 && pbCode[2] == 0x0F &&
        pbCode[3] == 0x1F && pbCode[4] == 0x84 && pbCode[5] == 0x00 &&
        pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00 &&
        pbCode[9] == 0x00) {
        return 10;
    }
    if (pbCode[0] == 0x66 && pbCode[1] == 0x66 && pbCode[2] == 0x66 &&
        pbCode[3] == 0x0F && pbCode[4] == 0x1F && pbCode[5] == 0x84 &&
        pbCode[6] == 0x00 && pbCode[7] == 0x00 && pbCode[8] == 0x00 &&
        pbCode[9] == 0x00 && pbCode[10] == 0x00) {
        return 11;
    }

    // int 3.
    if (pbCode[0] == 0xcc) {
        return 1;
    }
    return 0;
}