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//! Minecraft calls it a "friendly byte buffer".
use byteorder::{BigEndian, WriteBytesExt};
// const MAX_VARINT_SIZE: u32 = 5;
// const MAX_VARLONG_SIZE: u32 = 10;
// const DEFAULT_NBT_QUOTA: u32 = 2097152;
const MAX_STRING_LENGTH: u16 = 32767;
// const MAX_COMPONENT_STRING_LENGTH: u32 = 262144;
pub struct FriendlyByteBuf<'a> {
source: &'a mut Vec<u8>,
}
impl<'a> FriendlyByteBuf<'a> {
pub fn new(source: &'a mut Vec<u8>) -> FriendlyByteBuf<'a> {
FriendlyByteBuf { source }
}
pub fn write_byte(&mut self, n: u8) {
self.source.write_u8(n).unwrap();
}
pub fn write_bytes(&mut self, bytes: &[u8]) {
self.source.extend_from_slice(bytes);
}
pub fn write_varint(&mut self, mut n: u32) {
loop {
if (n & 0xFFFFFF80) == 0 {
self.write_byte(n as u8);
return ();
}
self.write_byte((n & 0x7F | 0x80) as u8);
n >>= 7;
}
}
pub fn write_utf_with_len(&mut self, string: &String, len: usize) {
if string.len() > len {
panic!(
"String too big (was {} bytes encoded, max {})",
string.len(),
len
);
}
self.write_varint(string.len() as u32);
self.write_bytes(string.as_bytes());
}
pub fn write_utf(&mut self, string: &String) {
self.write_utf_with_len(string, MAX_STRING_LENGTH as usize);
}
pub fn write_short(&mut self, n: u16) {
self.source.write_u16::<BigEndian>(n).unwrap();
}
}
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