Function parse_packet_urb

sniffer/src/main.rs:189–250

(packet: &EnhancedPacketBlock)

// ---------------------------------------------------------------------------

fn parse_packet_urb(packet: &EnhancedPacketBlock) -> UrbHeader {
    let urb_id = u64::from_le_bytes(packet.data[0..8].try_into().unwrap());

    let typ = match packet.data[8] {
        0x53 => UrbType::Submit,
        0x43 => UrbType::Complete,
        _    => UrbType::UrbError,
    };

    let transfer_type = match packet.data[9] {
        0x00 => TransferType::Isochronous,
        0x01 => TransferType::Interrupt,
        0x02 => TransferType::Control,
        0x03 => TransferType::Bulk,
        _    => TransferType::Bulk,
    };

    let endpoint = UsbEndpoint {
        raw:       hb(packet.data[10]),
        direction: if packet.data[10] & 0x80 != 0 {
            CommDirection::HostIn
        } else {
            CommDirection::HostOut
        },
    };

    let bus_number = u16::from_le_bytes(packet.data[12..14].try_into().unwrap());

    let setup_fragment = match packet.data[14] {
        0x00 => Some(SetupFragment {
            bmRequestType: hb(packet.data[40]),
            bRequest:      hb(packet.data[41]),
            wValue: hw(u16::from_le_bytes(packet.data[42..44].try_into().unwrap())),
            wIndex: hw(u16::from_le_bytes(packet.data[44..46].try_into().unwrap())),
            wLength: hw(u16::from_le_bytes(packet.data[46..48].try_into().unwrap())),
        }),
        _ => None,
    };

    let data_fragment = Some(parse_data_fragment(packet));

    let urb_status_value = i32::from_le_bytes(packet.data[28..32].try_into().unwrap());
    let urb_status = match urb_status_value {
        0 => UrbStatus::Success,
        e => UrbStatus::Err(hd(e as u32)),
    };

    let transfer_flags = u32::from_le_bytes(packet.data[56..60].try_into().unwrap());

    UrbHeader {
        id:             hq(urb_id),
        typ,
        transfer_type,
        endpoint,
        device_address: hb(packet.data[11]),
        bus_number:     hw(bus_number),
        urb_status,
        transfer_flags: hd(transfer_flags),