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extern crate byteorder;
use std::io;
use std::io::{Cursor, Read, Write};
use std::net::{TcpListener, TcpStream};
use super::bridge::{Bridge, BridgeError};
use super::Config;
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
pub struct WishboneServer {
listener: TcpListener,
connection: Option<TcpStream>,
}
#[derive(Debug)]
pub enum WishboneServerError {
IoError(io::Error),
ConnectionClosed,
NoMagic,
UnsupportedOperation,
BridgeError(BridgeError),
}
impl std::convert::From<io::Error> for WishboneServerError {
fn from(e: io::Error) -> WishboneServerError {
WishboneServerError::IoError(e)
}
}
impl std::convert::From<BridgeError> for WishboneServerError {
fn from(e: BridgeError) -> WishboneServerError {
WishboneServerError::BridgeError(e)
}
}
impl WishboneServer {
pub fn new(cfg: &Config) -> Result<WishboneServer, WishboneServerError> {
Ok(WishboneServer {
connection: None,
listener: TcpListener::bind(format!("{}:{}", cfg.bind_addr, cfg.bind_port))?,
})
}
pub fn connect(&mut self) -> Result<(), WishboneServerError> {
let (connection, _sockaddr) = self.listener.accept()?;
self.connection = Some(connection);
Ok(())
}
pub fn process(&mut self, bridge: &Bridge) -> Result<(), WishboneServerError> {
let mut header = [0; 16];
let mut offset = 0;
let mut byte = [0; 1];
if self.connection.is_none() {
return Err(WishboneServerError::ConnectionClosed);
}
let connection = &mut self.connection.as_mut().unwrap();
while offset < header.len() {
let len = connection.read(&mut byte)?;
if len == 0 {
return Err(WishboneServerError::ConnectionClosed);
}
header[offset] = byte[0];
offset += 1;
}
if header[0] != 0x4e || header[1] != 0x6f {
return Err(WishboneServerError::NoMagic);
}
let wcount = header[10];
let rcount = header[11];
let buffer_len: usize = (rcount * 4 + wcount * 4) as usize;
let mut buffer = vec![0; buffer_len];
offset = 0;
while offset < buffer.len() {
let len = connection.read(&mut byte)?;
if len == 0 {
return Err(WishboneServerError::ConnectionClosed);
}
buffer[offset] = byte[0];
offset += 1;
}
if wcount > 0 {
let mut addr_vec = Cursor::new(vec![header[12], header[13], header[14], header[15]]);
let mut addr = addr_vec.read_u32::<BigEndian>()?;
let mut count = 0;
while count < wcount {
let mut value_vec = Cursor::new(vec![
buffer[(4 * count) as usize],
buffer[(4 * count + 1) as usize],
buffer[(4 * count + 2) as usize],
buffer[(4 * count + 3) as usize],
]);
let value = value_vec.read_u32::<BigEndian>()?;
bridge.poke(addr, value)?;
count += 1;
addr += 4;
}
Ok(())
} else if rcount > 0 {
let mut addr_vec = Cursor::new(vec![buffer[0], buffer[1], buffer[2], buffer[3]]);
let mut addr = addr_vec.read_u32::<BigEndian>()?;
let mut count = 0;
while count < rcount {
let value = bridge.peek(addr)?;
let mut value_vec = vec![];
value_vec.write_u32::<BigEndian>(value)?;
buffer[(count * 4) as usize] = value_vec[0];
buffer[(count * 4 + 1) as usize] = value_vec[1];
buffer[(count * 4 + 2) as usize] = value_vec[2];
buffer[(count * 4 + 3) as usize] = value_vec[3];
count += 1;
addr += 4;
}
header[10] = header[11];
header[11] = 0;
connection.write_all(&header)?;
connection.write_all(&buffer)?;
Ok(())
} else {
Err(WishboneServerError::UnsupportedOperation)
}
}
}