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use alloc::vec;
use alloc::vec::Vec;
use crate::ross_frame::{RossFrame, RossFrameId};
#[derive(Debug, PartialEq)]
pub struct RossPacket {
pub is_error: bool,
pub device_address: u16,
pub data: Vec<u8>,
}
impl RossPacket {
pub fn to_frames(&self) -> Vec<RossFrame> {
if self.data.len() <= 8 {
let mut data = [0; 8];
for i in 0..self.data.len() {
data[i] = self.data[i];
}
return vec!(RossFrame {
not_error_flag: !self.is_error,
start_frame_flag: true,
multi_frame_flag: false,
frame_id: RossFrameId::LastFrameId(0),
device_address: self.device_address,
data_len: self.data.len() as u8,
data
});
}
let frame_count = (self.data.len() - 1) / 7 + 1;
let mut frames = vec!();
for i in 0..frame_count {
let data_len = if i == frame_count - 1 {
7 - self.data.len() % 7 + 1
} else {
8
};
let mut data = [0u8; 8];
if i == 0 {
data[0] = ((frame_count - 1) & 0xff) as u8;
} else {
data[0] = (i & 0xff) as u8;
}
for j in 0..(data_len - 1) {
data[j + 1] = self.data[i * 7 + j];
}
frames.push(RossFrame {
not_error_flag: !self.is_error,
start_frame_flag: i == 0,
multi_frame_flag: true,
frame_id: if i == 0 {
RossFrameId::LastFrameId(frame_count as u16 - 1)
} else {
RossFrameId::CurrentFrameId(i as u16)
},
device_address: self.device_address,
data_len: data_len as u8,
data,
});
}
return frames;
}
}
#[derive(Debug, PartialEq)]
pub enum RossPacketBuilderError {
OutOfOrder,
SingleFramePacket,
TooManyFrames,
WrongFrameType,
DeviceAddressMismatch,
MissingFrames,
}
#[derive(Debug, PartialEq)]
pub struct RossPacketBuilder {
is_error: bool,
expected_frame_count: u16,
device_address: u16,
frames: Vec<RossFrame>,
}
impl RossPacketBuilder {
pub fn expected_frame_count(&self) -> u16 {
self.expected_frame_count
}
pub fn frame_count(&self) -> u16 {
self.frames.len() as u16
}
pub fn frames_left(&self) -> u16 {
self.expected_frame_count() - self.frame_count()
}
pub fn new(frame: RossFrame) -> Result<Self, RossPacketBuilderError> {
if !frame.start_frame_flag {
return Err(RossPacketBuilderError::OutOfOrder);
}
let expected_frame_count = if let RossFrameId::LastFrameId(last_frame_id) = frame.frame_id {
last_frame_id + 1
} else {
return Err(RossPacketBuilderError::OutOfOrder);
};
Ok(RossPacketBuilder {
is_error: !frame.not_error_flag,
expected_frame_count,
device_address: frame.device_address,
frames: vec![frame],
})
}
pub fn add_frame(&mut self, frame: RossFrame) -> Result<(), RossPacketBuilderError> {
if !frame.not_error_flag != self.is_error {
return Err(RossPacketBuilderError::WrongFrameType);
}
if frame.device_address != self.device_address {
return Err(RossPacketBuilderError::DeviceAddressMismatch);
}
if frame.start_frame_flag {
return Err(RossPacketBuilderError::OutOfOrder);
}
if !frame.multi_frame_flag {
return Err(RossPacketBuilderError::SingleFramePacket);
}
if let RossFrameId::CurrentFrameId(frame_id) = frame.frame_id {
if frame_id != self.frames.len() as u16 {
return Err(RossPacketBuilderError::OutOfOrder);
}
if frame_id >= self.expected_frame_count {
return Err(RossPacketBuilderError::TooManyFrames);
}
} else {
return Err(RossPacketBuilderError::OutOfOrder);
}
self.frames.push(frame);
Ok(())
}
pub fn build(&self) -> Result<RossPacket, RossPacketBuilderError> {
if self.frames.len() != self.expected_frame_count as usize {
return Err(RossPacketBuilderError::MissingFrames);
}
let mut data = vec![];
for frame in self.frames.iter() {
let start_index = if frame.multi_frame_flag { 1 } else { 0 };
for i in start_index..frame.data_len {
data.push(frame.data[i as usize]);
}
}
Ok(RossPacket {
is_error: self.is_error,
device_address: self.device_address,
data,
})
}
}