82 lines
2.6 KiB
Rust
82 lines
2.6 KiB
Rust
use std::{convert::TryInto, str::from_utf8};
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use crate::print_error;
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pub struct Headers;
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impl Headers {
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pub const MESSAGE: u8 = 0x00;
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pub const ASK_NAME: u8 = 0x01;
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pub const TELL_NAME: u8 = 0x02;
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pub const FILE: u8 = 0x03;
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pub const ASK_LARGE_FILES: u8 = 0x04;
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pub const ACCEPT_LARGE_FILES: u8 = 0x05;
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pub const LARGE_FILE_CHUNK: u8 = 0x06;
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pub const ACK_CHUNK: u8 = 0x07;
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pub const ABORT_FILES_TRANSFER: u8 = 0x08;
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}
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pub fn new_message(message: String) -> Vec<u8> {
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[&[Headers::MESSAGE], message.as_bytes()].concat()
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}
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pub fn ask_name() -> Vec<u8> {
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vec![Headers::ASK_NAME]
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}
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pub fn tell_name(name: &str) -> Vec<u8> {
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[&[Headers::TELL_NAME], name.as_bytes()].concat()
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}
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pub fn file(file_name: &str, buffer: &[u8]) -> Vec<u8> {
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[&[Headers::FILE], &(file_name.len() as u16).to_be_bytes()[..], file_name.as_bytes(), buffer].concat()
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}
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pub fn parse_file<'a>(buffer: &'a [u8]) -> Option<(&'a [u8], &'a [u8])> {
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if buffer.len() > 3 {
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let file_name_len = u16::from_be_bytes([buffer[1], buffer[2]]) as usize;
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if buffer.len() > 3+file_name_len {
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let file_name = &buffer[3..3+file_name_len];
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return Some((file_name, &buffer[3+file_name_len..]));
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}
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}
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None
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}
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pub fn ask_large_files(file_info: Vec<(u64, Vec<u8>)>) -> Vec<u8> {
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let mut buff = vec![Headers::ASK_LARGE_FILES];
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file_info.into_iter().for_each(|info| {
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buff.extend(&info.0.to_be_bytes());
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buff.extend(&(info.1.len() as u16).to_be_bytes());
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buff.extend(info.1);
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});
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buff
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}
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pub fn parse_ask_files(buffer: &[u8]) -> Option<Vec<(u64, String)>> {
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let mut files_info = Vec::new();
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let mut n = 1;
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while n < buffer.len() {
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if buffer[n..].len() > 10 { //8 + 2
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let file_size = u64::from_be_bytes(buffer[n..n+8].try_into().unwrap());
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let file_name_len = u16::from_be_bytes(buffer[n+8..n+10].try_into().unwrap()) as usize;
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if buffer.len() >= n+10+file_name_len {
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match from_utf8(&buffer[n+10..n+10+file_name_len]) {
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Ok(file_name) => {
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let file_name = sanitize_filename::sanitize(file_name);
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files_info.push((file_size, file_name));
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n += 10+file_name_len;
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}
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Err(e) => {
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print_error!(e);
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return None
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}
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}
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} else {
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return None
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}
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} else {
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return None
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}
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}
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Some(files_info)
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} |