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|
use regex::Regex;
use std::collections::VecDeque;
use std::collections::vec_deque::Drain;
use std::convert::TryInto;
use super::*;
pub struct CommandToByteMapper {
buffer: VecDeque<u8>,
}
impl CommandToByteMapper {
pub fn new() -> CommandToByteMapper {
CommandToByteMapper{ buffer: VecDeque::new() }
}
pub fn map(&mut self, command: Command) -> Drain<u8> {
self.clear_buffer();
self.write_u8(command.opcode());
match command {
Command::GetInfo => {},
Command::CreateScanner { scan_id, } => {
self.write_u32(scan_id);
},
Command::RemoveScanner { scan_id, } => {
self.write_u32(scan_id);
},
Command::CreateConnectionChannel {
conn_id,
bd_addr,
latency_mode,
auto_disconnect_time,
} => {
self.write_u32(conn_id);
self.write_bdaddr(&bd_addr[..]);
if let Ok(latency_mode) = latency_mode.try_into() {
self.write_u8(latency_mode);
}
self.write_i16(auto_disconnect_time);
},
Command::RemoveConnectionChannel { conn_id } => {
self.write_u32(conn_id);
},
Command::ForceDisconnect { bd_addr } => {
self.write_bdaddr(&bd_addr[..]);
},
Command::ChangeModeParameters {
conn_id,
latency_mode,
auto_disconnect_time,
} => {
self.write_u32(conn_id);
if let Ok(latency_mode) = latency_mode.try_into() {
self.write_u8(latency_mode);
}
self.write_i16(auto_disconnect_time);
},
Command::Ping { ping_id } => {
self.write_u32(ping_id);
},
Command::GetButtonInfo { bd_addr } => {
self.write_bdaddr(&bd_addr[..]);
},
Command::CreateScanWizard { scan_wizard_id } => {
self.write_u32(scan_wizard_id);
},
Command::CancelScanWizard { scan_wizard_id } => {
self.write_u32(scan_wizard_id);
},
Command::DeleteButton { bd_addr } => {
self.write_bdaddr(&bd_addr[..]);
},
Command::CreateBatteryStatusListener { listener_id, bd_addr } => {
self.write_u32(listener_id);
self.write_bdaddr(&bd_addr[..]);
},
Command::RemoveBatteryStatusListener { listener_id } => {
self.write_u32(listener_id);
},
}
self.prepend_size();
self.buffer.drain(..)
}
fn clear_buffer(&mut self) {
self.buffer.drain(..);
}
fn prepend_size(&mut self) {
let len = self.buffer.len();
self.buffer.push_front((len >> 8) as u8);
self.buffer.push_front((len & 255) as u8);
}
fn write_u8(&mut self, value: u8) {
let mut buf = vec![value].into_iter().collect();
self.buffer.append(&mut buf);
}
/*
fn write_bool(&mut self, value: bool) {
if value {
self.write_u8(1);
}
else {
self.write_u8(0);
}
}
*/
fn write_u16(&mut self, value: u16) {
self.write_u8(value as u8);
self.write_u8((value >> 8) as u8);
}
fn write_i16(&mut self, value: i16) {
self.write_u8(value as u8);
self.write_u8((value >> 8) as u8);
}
fn write_u32(&mut self, value: u32) {
self.write_u16(value as u16);
self.write_u16((value >> 16) as u16);
}
/*
fn write_i32(&mut self, value: i32) {
self.write_i16(value as i16);
self.write_i16((value >> 16) as i16);
}
*/
fn write_bdaddr(&mut self, str: &str) {
let re = Regex::new(r"([0-9a-z]{2}:){5}[0-9a-z]{2}").unwrap();
if re.is_match(str) {
if let Some(b) = hex_to_u8(&str[15..]) { self.write_u8(b); }
if let Some(b) = hex_to_u8(&str[12..]) { self.write_u8(b); }
if let Some(b) = hex_to_u8(&str[ 9..]) { self.write_u8(b); }
if let Some(b) = hex_to_u8(&str[ 6..]) { self.write_u8(b); }
if let Some(b) = hex_to_u8(&str[ 3..]) { self.write_u8(b); }
if let Some(b) = hex_to_u8(&str[ ..]) { self.write_u8(b); }
}
}
}
fn hex_to_u8(buffer: &str) -> Option<u8> {
let mut char_indices = buffer.char_indices();
match (char_indices.next(), char_indices.next()) {
(Some((0, upper)), Some((1, lower))) => {
let mut b = 0u8;
if let Some(v) = upper.to_digit(16) { b += (v as u8) << 4; }
if let Some(v) = lower.to_digit(16) { b += v as u8; }
Some(b)
},
_ => None,
}
}
|
