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use std::io::{self, Cursor, Read, Write};
use byteorder::{BE, ReadBytesExt, WriteBytesExt};
use tracing::warn;
use crate::{AzBuf, AzBufVar, BufReadError};
impl AzBuf for () {
fn azalea_read(_buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(())
}
fn azalea_write(&self, _buf: &mut impl Write) -> io::Result<()> {
Ok(())
}
}
impl AzBuf for i32 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(buf.read_i32::<BE>()?)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_i32::<BE>(*self)
}
}
impl AzBufVar for i32 {
/// Read a single varint from the reader and return the value
fn azalea_read_var(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
// fast varint impl based on https://github.com/luojia65/mc-varint/blob/master/src/lib.rs#L67
let mut buffer = [0];
let mut ans = 0;
for i in 0..5 {
buf.read_exact(&mut buffer)?;
ans |= ((buffer[0] & 0b0111_1111) as i32) << (7 * i);
if buffer[0] & 0b1000_0000 == 0 {
break;
}
}
Ok(ans)
}
fn azalea_write_var(&self, buf: &mut impl Write) -> io::Result<()> {
let mut buffer = [0];
let mut value = *self;
if value == 0 {
buf.write_all(&buffer)?;
}
while value != 0 {
buffer[0] = (value & 0b0111_1111) as u8;
value = (value >> 7) & (i32::MAX >> 6);
if value != 0 {
buffer[0] |= 0b1000_0000;
}
buf.write_all(&buffer)?;
}
Ok(())
}
}
impl AzBufVar for i64 {
fn azalea_read_var(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let mut buffer = [0];
let mut ans = 0;
for i in 0..10 {
buf.read_exact(&mut buffer)
.map_err(|_| BufReadError::InvalidVarLong)?;
ans |= ((buffer[0] & 0b0111_1111) as i64) << (7 * i);
if buffer[0] & 0b1000_0000 == 0 {
break;
}
}
Ok(ans)
}
fn azalea_write_var(&self, buf: &mut impl Write) -> io::Result<()> {
let mut buffer = [0];
let mut value = *self;
if value == 0 {
buf.write_all(&buffer).unwrap();
}
while value != 0 {
buffer[0] = (value & 0b0111_1111) as u8;
value = (value >> 7) & (i64::MAX >> 6);
if value != 0 {
buffer[0] |= 0b1000_0000;
}
buf.write_all(&buffer)?;
}
Ok(())
}
}
impl AzBufVar for u64 {
fn azalea_read_var(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
i64::azalea_read_var(buf).map(|i| i as u64)
}
fn azalea_write_var(&self, buf: &mut impl Write) -> io::Result<()> {
i64::azalea_write_var(&(*self as i64), buf)
}
}
impl AzBuf for u32 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(i32::azalea_read(buf)? as u32)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
i32::azalea_write(&(*self as i32), buf)
}
}
impl AzBufVar for u32 {
fn azalea_read_var(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(i32::azalea_read_var(buf)? as u32)
}
fn azalea_write_var(&self, buf: &mut impl Write) -> io::Result<()> {
i32::azalea_write_var(&(*self as i32), buf)
}
}
impl AzBuf for u16 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
i16::azalea_read(buf).map(|i| i as u16)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
i16::azalea_write(&(*self as i16), buf)
}
}
impl AzBuf for i16 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(buf.read_i16::<BE>()?)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_i16::<BE>(*self)
}
}
impl AzBufVar for u16 {
fn azalea_read_var(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(i32::azalea_read_var(buf)? as u16)
}
fn azalea_write_var(&self, buf: &mut impl Write) -> io::Result<()> {
i32::azalea_write_var(&(*self as i32), buf)
}
}
impl AzBuf for i64 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(buf.read_i64::<BE>()?)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_i64::<BE>(*self)
}
}
impl AzBuf for u64 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
i64::azalea_read(buf).map(|i| i as u64)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_u64::<BE>(*self)
}
}
impl AzBuf for bool {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let byte = u8::azalea_read(buf)?;
if byte > 1 {
warn!("Boolean value was not 0 or 1, but {byte}");
}
Ok(byte != 0)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
let byte = u8::from(*self);
byte.azalea_write(buf)
}
}
impl AzBuf for u8 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(buf.read_u8()?)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_u8(*self)
}
}
impl AzBuf for i8 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
u8::azalea_read(buf).map(|i| i as i8)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
(*self as u8).azalea_write(buf)
}
}
impl AzBuf for f32 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(buf.read_f32::<BE>()?)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_f32::<BE>(*self)
}
}
impl AzBuf for f64 {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
Ok(buf.read_f64::<BE>()?)
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
buf.write_f64::<BE>(*self)
}
}
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