max/embassy
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

parse data from device in-place

Browse Source
This commit is contained in:
kbleeke
2023-03-31 14:18:39 +02:00
parent e6e5685f7c
commit 76ebebd0c5
2 changed files with 154 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
src/runner.rs
View File

@@ -328,45 +328,23 @@ where
let len = (status & STATUS_F2_PKT_LEN_MASK) >> STATUS_F2_PKT_LEN_SHIFT;
self.bus.wlan_read(buf, len).await;
trace!("rx {:02x}", Bytes(&slice8_mut(buf)[..(len as usize).min(48)]));
self.rx(&slice8_mut(buf)[..len as usize]);
self.rx(&mut slice8_mut(buf)[..len as usize]);
} else {
break;
}
}
}
fn rx(&mut self, packet: &[u8]) {
if packet.len() < SdpcmHeader::SIZE {
warn!("packet too short, len={}", packet.len());
return;
}
let sdpcm_header = SdpcmHeader::from_bytes(packet[..SdpcmHeader::SIZE].try_into().unwrap());
trace!("rx {:?}", sdpcm_header);
if sdpcm_header.len != !sdpcm_header.len_inv {
warn!("len inv mismatch");
return;
}
if sdpcm_header.len as usize != packet.len() {
// TODO: is this guaranteed??
warn!("len from header doesn't match len from spi");
return;
}
fn rx(&mut self, packet: &mut [u8]) {
let Some((sdpcm_header, payload)) = SdpcmHeader::parse(packet) else { return };
self.update_credit(&sdpcm_header);
let channel = sdpcm_header.channel_and_flags & 0x0f;
let payload = &packet[sdpcm_header.header_length as _..];
match channel {
CHANNEL_TYPE_CONTROL => {
if payload.len() < CdcHeader::SIZE {
warn!("payload too short, len={}", payload.len());
return;
}
let cdc_header = CdcHeader::from_bytes(payload[..CdcHeader::SIZE].try_into().unwrap());
let Some((cdc_header, response)) = CdcHeader::parse(payload) else { return; };
trace!(" {:?}", cdc_header);
if cdc_header.id == self.ioctl_id {
@@ -375,28 +353,21 @@ where
panic!("IOCTL error {}", cdc_header.status as i32);
}
let resp_len = cdc_header.len as usize;
let response = &payload[CdcHeader::SIZE..][..resp_len];
info!("IOCTL Response: {:02x}", Bytes(response));
self.ioctl_state.ioctl_done(response);
}
}
CHANNEL_TYPE_EVENT => {
let bcd_header = BcdHeader::from_bytes(&payload[..BcdHeader::SIZE].try_into().unwrap());
trace!(" {:?}", bcd_header);
let packet_start = BcdHeader::SIZE + 4 * bcd_header.data_offset as usize;
if packet_start + EventPacket::SIZE > payload.len() {
let Some((_, bcd_packet)) = BcdHeader::parse(payload) else {
warn!("BCD event, incomplete header");
return;
}
let bcd_packet = &payload[packet_start..];
trace!(" {:02x}", Bytes(&bcd_packet[..(bcd_packet.len() as usize).min(36)]));
};
let mut event_packet = EventPacket::from_bytes(&bcd_packet[..EventPacket::SIZE].try_into().unwrap());
event_packet.byteswap();
let Some((event_packet, evt_data)) = EventPacket::parse(bcd_packet) else {
warn!("BCD event, incomplete data");
return;
};
const ETH_P_LINK_CTL: u16 = 0x886c; // HPNA, wlan link local tunnel, according to linux if_ether.h
if event_packet.eth.ether_type != ETH_P_LINK_CTL {
@@ -427,13 +398,7 @@ where
return;
}
if event_packet.msg.datalen as usize >= (bcd_packet.len() - EventMessage::SIZE) {
warn!("BCD event, incomplete data");
return;
}
let evt_type = events::Event::from(event_packet.msg.event_type as u8);
let evt_data = &bcd_packet[EventMessage::SIZE..][..event_packet.msg.datalen as usize];
debug!(
"=== EVENT {:?}: {:?} {:02x}",
evt_type,
@@ -449,16 +414,8 @@ where
}
}
CHANNEL_TYPE_DATA => {
let bcd_header = BcdHeader::from_bytes(&payload[..BcdHeader::SIZE].try_into().unwrap());
trace!(" {:?}", bcd_header);
let packet_start = BcdHeader::SIZE + 4 * bcd_header.data_offset as usize;
if packet_start > payload.len() {
warn!("packet start out of range.");
return;
}
let packet = &payload[packet_start..];
trace!("rx pkt {:02x}", Bytes(&packet[..(packet.len() as usize).min(48)]));
let Some((_, packet)) = BcdHeader::parse(payload) else { return };
trace!("rx pkt {:02x}", Bytes(&packet[..packet.len().min(48)]));
match self.ch.try_rx_buf() {
Some(buf) => {

149
src/structs.rs
View File

@@ -1,4 +1,5 @@
use crate::events::Event;
use crate::fmt::Bytes;
macro_rules! impl_bytes {
($t:ident) => {
@@ -11,8 +12,28 @@ macro_rules! impl_bytes {
}
#[allow(unused)]
pub fn from_bytes(bytes: &[u8; Self::SIZE]) -> Self {
unsafe { core::mem::transmute(*bytes) }
pub fn from_bytes(bytes: &[u8; Self::SIZE]) -> &Self {
let alignment = core::mem::align_of::<Self>();
assert_eq!(
bytes.as_ptr().align_offset(alignment),
0,
"{} is not aligned",
core::any::type_name::<Self>()
);
unsafe { core::mem::transmute(bytes) }
}
#[allow(unused)]
pub fn from_bytes_mut(bytes: &mut [u8; Self::SIZE]) -> &mut Self {
let alignment = core::mem::align_of::<Self>();
assert_eq!(
bytes.as_ptr().align_offset(alignment),
0,
"{} is not aligned",
core::any::type_name::<Self>()
);
unsafe { core::mem::transmute(bytes) }
}
}
};
@@ -67,9 +88,35 @@ pub struct SdpcmHeader {
}
impl_bytes!(SdpcmHeader);
impl SdpcmHeader {
pub fn parse(packet: &mut [u8]) -> Option<(&mut Self, &mut [u8])> {
let packet_len = packet.len();
if packet_len < Self::SIZE {
warn!("packet too short, len={}", packet.len());
return None;
}
let (sdpcm_header, sdpcm_packet) = packet.split_at_mut(Self::SIZE);
let sdpcm_header = Self::from_bytes_mut(sdpcm_header.try_into().unwrap());
trace!("rx {:?}", sdpcm_header);
if sdpcm_header.len != !sdpcm_header.len_inv {
warn!("len inv mismatch");
return None;
}
if sdpcm_header.len as usize != packet_len {
warn!("len from header doesn't match len from spi");
return None;
}
let sdpcm_packet = &mut sdpcm_packet[(sdpcm_header.header_length as usize - Self::SIZE)..];
Some((sdpcm_header, sdpcm_packet))
}
}
#[derive(Debug, Clone, Copy)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(C)]
// #[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(C, packed(2))]
pub struct CdcHeader {
pub cmd: u32,
pub len: u32,
@@ -79,6 +126,21 @@ pub struct CdcHeader {
}
impl_bytes!(CdcHeader);
impl CdcHeader {
pub fn parse(packet: &mut [u8]) -> Option<(&mut Self, &mut [u8])> {
if packet.len() < Self::SIZE {
warn!("payload too short, len={}", packet.len());
return None;
}
let (cdc_header, payload) = packet.split_at_mut(Self::SIZE);
let cdc_header = Self::from_bytes_mut(cdc_header.try_into().unwrap());
let payload = &mut payload[..cdc_header.len as usize];
Some((cdc_header, payload))
}
}
pub const BDC_VERSION: u8 = 2;
pub const BDC_VERSION_SHIFT: u8 = 4;
@@ -95,6 +157,25 @@ pub struct BcdHeader {
}
impl_bytes!(BcdHeader);
impl BcdHeader {
pub fn parse(packet: &mut [u8]) -> Option<(&mut Self, &mut [u8])> {
if packet.len() < Self::SIZE {
return None;
}
let (bcd_header, bcd_packet) = packet.split_at_mut(Self::SIZE);
let bcd_header = Self::from_bytes_mut(bcd_header.try_into().unwrap());
trace!(" {:?}", bcd_header);
let packet_start = 4 * bcd_header.data_offset as usize;
let bcd_packet = bcd_packet.get_mut(packet_start..)?;
trace!(" {:02x}", Bytes(&bcd_packet[..bcd_packet.len().min(36)]));
Some((bcd_header, bcd_packet))
}
}
#[derive(Clone, Copy)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(C)]
@@ -130,8 +211,8 @@ impl EventHeader {
}
#[derive(Debug, Clone, Copy)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(C)]
// #[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(C, packed(2))]
pub struct EventMessage {
/// version
pub version: u16,
@@ -158,6 +239,45 @@ pub struct EventMessage {
}
impl_bytes!(EventMessage);
#[cfg(feature = "defmt")]
impl defmt::Format for EventMessage {
fn format(&self, fmt: defmt::Formatter) {
let event_type = self.event_type;
let status = self.status;
let reason = self.reason;
let auth_type = self.auth_type;
let datalen = self.datalen;
defmt::write!(
fmt,
"EventMessage {{ \
version: {=u16}, \
flags: {=u16}, \
event_type: {=u32}, \
status: {=u32}, \
reason: {=u32}, \
auth_type: {=u32}, \
datalen: {=u32}, \
addr: {=[u8; 6]:x}, \
ifname: {=[u8; 16]:x}, \
ifidx: {=u8}, \
bsscfgidx: {=u8}, \
}} ",
self.version,
self.flags,
event_type,
status,
reason,
auth_type,
datalen,
self.addr,
self.ifname,
self.ifidx,
self.bsscfgidx
);
}
}
impl EventMessage {
pub fn byteswap(&mut self) {
self.version = self.version.to_be();
@@ -172,7 +292,7 @@ impl EventMessage {
#[derive(Clone, Copy)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
#[repr(C)]
#[repr(C, packed(2))]
pub struct EventPacket {
pub eth: EthernetHeader,
pub hdr: EventHeader,
@@ -181,6 +301,21 @@ pub struct EventPacket {
impl_bytes!(EventPacket);
impl EventPacket {
pub fn parse(packet: &mut [u8]) -> Option<(&mut Self, &mut [u8])> {
if packet.len() < Self::SIZE {
return None;
}
let (event_header, event_packet) = packet.split_at_mut(Self::SIZE);
let event_header = Self::from_bytes_mut(event_header.try_into().unwrap());
// warn!("event_header {:x}", event_header as *const _);
event_header.byteswap();
let event_packet = event_packet.get_mut(..event_header.msg.datalen as usize)?;
Some((event_header, event_packet))
}
pub fn byteswap(&mut self) {
self.eth.byteswap();
self.hdr.byteswap();