280 lines
6.6 KiB
Rust
280 lines
6.6 KiB
Rust
use core::str;
|
|
use std::io::{self, Error, ErrorKind, Read};
|
|
|
|
use bytes::{Buf, BufMut, BytesMut};
|
|
|
|
use crate::protocol::{VarInt, VarLong};
|
|
|
|
const SEGMENT_BITS: u8 = 0x7F;
|
|
const CONTINUE_BIT: u8 = 0x80;
|
|
|
|
pub struct ByteBuffer {
|
|
buffer: BytesMut,
|
|
}
|
|
|
|
impl ByteBuffer {
|
|
pub fn empty() -> Self {
|
|
Self {
|
|
buffer: BytesMut::new(),
|
|
}
|
|
}
|
|
pub fn new(buffer: BytesMut) -> Self {
|
|
Self { buffer }
|
|
}
|
|
|
|
pub fn get_var_int(&mut self) -> VarInt {
|
|
let mut value: i32 = 0;
|
|
let mut position: i32 = 0;
|
|
|
|
loop {
|
|
let read = self.buffer.get_u8();
|
|
|
|
value |= ((read & SEGMENT_BITS) as i32) << position;
|
|
|
|
if read & CONTINUE_BIT == 0 {
|
|
break;
|
|
}
|
|
|
|
position += 7;
|
|
|
|
if position >= 32 {
|
|
panic!("VarInt is too big");
|
|
}
|
|
}
|
|
|
|
value
|
|
}
|
|
|
|
pub fn get_var_long(&mut self) -> VarLong {
|
|
let mut value: i64 = 0;
|
|
let mut position: i64 = 0;
|
|
|
|
loop {
|
|
let read = self.buffer.get_u8();
|
|
|
|
value |= ((read & SEGMENT_BITS) as i64) << position;
|
|
|
|
if read & CONTINUE_BIT == 0 {
|
|
break;
|
|
}
|
|
|
|
position += 7;
|
|
|
|
if position >= 64 {
|
|
panic!("VarInt is too big");
|
|
}
|
|
}
|
|
|
|
value
|
|
}
|
|
|
|
pub fn get_string(&mut self) -> Result<String, io::Error> {
|
|
self.get_string_len(32767)
|
|
}
|
|
|
|
pub fn get_string_len(&mut self, max_size: usize) -> Result<String, io::Error> {
|
|
let size = self.get_var_int();
|
|
if size as usize > max_size {
|
|
return Err(Error::new(
|
|
ErrorKind::InvalidData,
|
|
"String length is bigger than max size",
|
|
));
|
|
}
|
|
let data = self.buffer.copy_to_bytes(size as usize);
|
|
if data.len() > max_size {
|
|
return Err(Error::new(
|
|
ErrorKind::InvalidData,
|
|
"String is bigger than max size",
|
|
));
|
|
}
|
|
match str::from_utf8(&data) {
|
|
Ok(string_result) => Ok(string_result.to_string()),
|
|
Err(e) => Err(Error::new(ErrorKind::InvalidData, e)),
|
|
}
|
|
}
|
|
|
|
pub fn get_bool(&mut self) -> bool {
|
|
self.buffer.get_u8() != 0
|
|
}
|
|
|
|
pub fn get_uuid(&mut self) -> uuid::Uuid {
|
|
let mut bytes = [0u8; 16];
|
|
self.buffer.copy_to_slice(&mut bytes);
|
|
uuid::Uuid::from_slice(&bytes).expect("Failed to parse UUID")
|
|
}
|
|
|
|
pub fn put_bool(&mut self, v: bool) {
|
|
if v {
|
|
self.buffer.put_u8(1);
|
|
} else {
|
|
self.buffer.put_u8(0);
|
|
}
|
|
}
|
|
|
|
pub fn put_uuid(&mut self, v: uuid::Uuid) {
|
|
self.buffer.put_slice(v.as_bytes());
|
|
}
|
|
|
|
pub fn put_string(&mut self, val: &str) {
|
|
self.put_var_int(val.len() as VarInt);
|
|
self.buffer.put(val.as_bytes());
|
|
}
|
|
|
|
pub fn put_string_array(&mut self, array: &[String]) {
|
|
for string in array {
|
|
self.put_string(string)
|
|
}
|
|
}
|
|
|
|
pub fn put_var_int(&mut self, value: VarInt) {
|
|
let mut val = value as u32;
|
|
for _ in 0..5 {
|
|
let mut b: u8 = val as u8 & 0b01111111;
|
|
val >>= 7;
|
|
if val != 0 {
|
|
b |= 0b10000000;
|
|
}
|
|
self.buffer.put_u8(b);
|
|
if val == 0 {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Reads a boolean. If true, the closure is called, and the returned value is
|
|
/// wrapped in Some. Otherwise, this returns None.
|
|
pub fn get_option<T>(&mut self, val: impl FnOnce(&mut Self) -> T) -> Option<T> {
|
|
if self.get_bool() {
|
|
Some(val(self))
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
/// Writes `true` if the option is Some, or `false` if None. If the option is
|
|
/// some, then it also calls the `write` closure.
|
|
pub fn put_option<T>(&mut self, val: &Option<T>, write: impl FnOnce(&mut Self, &T)) {
|
|
self.put_bool(val.is_some());
|
|
match val {
|
|
Some(v) => write(self, v),
|
|
None => {}
|
|
}
|
|
}
|
|
|
|
pub fn get_list<T>(&mut self, val: impl Fn(&mut Self) -> T) -> Vec<T> {
|
|
let len = self.get_var_int().try_into().unwrap();
|
|
let mut list = Vec::with_capacity(len);
|
|
for _ in 0..len {
|
|
list.push(val(self));
|
|
}
|
|
list
|
|
}
|
|
/// Writes a list to the buffer.
|
|
pub fn put_list<T>(&mut self, list: &[T], write: impl Fn(&mut Self, &T)) {
|
|
self.put_var_int(list.len().try_into().unwrap());
|
|
for v in list {
|
|
write(self, v);
|
|
}
|
|
}
|
|
|
|
pub fn put_varint_arr(&mut self, v: &[i32]) {
|
|
self.put_list(v, |p, &v| p.put_var_int(v))
|
|
}
|
|
|
|
pub fn get_nbt(&mut self) -> Option<crab_nbt::NbtTag> {
|
|
match crab_nbt::NbtTag::deserialize(self.buf()) {
|
|
Ok(v) => Some(v),
|
|
Err(err) => None,
|
|
}
|
|
}
|
|
|
|
pub fn buf(&mut self) -> &mut BytesMut {
|
|
&mut self.buffer
|
|
}
|
|
}
|
|
|
|
// trait
|
|
impl ByteBuffer {
|
|
pub fn get_u8(&mut self) -> u8 {
|
|
self.buffer.get_u8()
|
|
}
|
|
|
|
pub fn get_i8(&mut self) -> i8 {
|
|
self.buffer.get_i8()
|
|
}
|
|
|
|
pub fn get_u16(&mut self) -> u16 {
|
|
self.buffer.get_u16()
|
|
}
|
|
|
|
pub fn get_i16(&mut self) -> i16 {
|
|
self.buffer.get_i16()
|
|
}
|
|
|
|
pub fn get_u32(&mut self) -> u32 {
|
|
self.buffer.get_u32()
|
|
}
|
|
|
|
pub fn get_i32(&mut self) -> i32 {
|
|
self.buffer.get_i32()
|
|
}
|
|
|
|
pub fn get_u64(&mut self) -> u64 {
|
|
self.buffer.get_u64()
|
|
}
|
|
|
|
pub fn get_i64(&mut self) -> i64 {
|
|
self.buffer.get_i64()
|
|
}
|
|
|
|
pub fn get_f32(&mut self) -> f32 {
|
|
self.buffer.get_f32()
|
|
}
|
|
|
|
pub fn get_f64(&mut self) -> f64 {
|
|
self.buffer.get_f64()
|
|
}
|
|
|
|
pub fn put_u8(&mut self, n: u8) {
|
|
self.buffer.put_u8(n)
|
|
}
|
|
|
|
pub fn put_i8(&mut self, n: i8) {
|
|
self.buffer.put_i8(n)
|
|
}
|
|
|
|
pub fn put_u16(&mut self, n: u16) {
|
|
self.buffer.put_u16(n)
|
|
}
|
|
|
|
pub fn put_i16(&mut self, n: i16) {
|
|
self.buffer.put_i16(n)
|
|
}
|
|
|
|
pub fn put_u32(&mut self, n: u32) {
|
|
self.buffer.put_u32(n)
|
|
}
|
|
|
|
pub fn put_i32(&mut self, n: i32) {
|
|
self.buffer.put_i32(n)
|
|
}
|
|
|
|
pub fn put_u64(&mut self, n: u64) {
|
|
self.buffer.put_u64(n)
|
|
}
|
|
|
|
pub fn put_i64(&mut self, n: i64) {
|
|
self.buffer.put_i64(n)
|
|
}
|
|
|
|
pub fn put_f32(&mut self, n: f32) {
|
|
self.buffer.put_f32(n)
|
|
}
|
|
|
|
pub fn copy_to_bytes(&mut self, len: usize) -> bytes::Bytes {
|
|
self.buffer.copy_to_bytes(len)
|
|
}
|
|
pub fn put_slice(&mut self, src: &[u8]) {
|
|
self.buffer.put_slice(src)
|
|
}
|
|
}
|