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