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use crate::Error;
use crate::Tag;
use byteorder::{WriteBytesExt, BE};
use flate2::write::{GzEncoder, ZlibEncoder};
use std::collections::HashMap;
use std::io::Write;
// who needs friends when you've got code that runs in nanoseconds?
#[inline]
fn write_string(writer: &mut dyn Write, string: &str) -> Result<(), Error> {
writer.write_i16::<BE>(string.len() as i16)?;
writer.write_all(string.as_bytes())?;
Ok(())
}
#[inline]
fn write_compound(
writer: &mut dyn Write,
value: &HashMap<String, Tag>,
end_tag: bool,
) -> Result<(), Error> {
for (key, tag) in value {
match tag {
Tag::End => {}
Tag::Byte(value) => {
writer.write_u8(1)?;
write_string(writer, key)?;
writer.write_i8(*value)?
}
Tag::Short(value) => {
writer.write_u8(2)?;
write_string(writer, key)?;
writer.write_i16::<BE>(*value)?
}
Tag::Int(value) => {
writer.write_u8(3)?;
write_string(writer, key)?;
writer.write_i32::<BE>(*value)?
}
Tag::Long(value) => {
writer.write_u8(4)?;
write_string(writer, key)?;
writer.write_i64::<BE>(*value)?
}
Tag::Float(value) => {
writer.write_u8(5)?;
write_string(writer, key)?;
writer.write_f32::<BE>(*value)?
}
Tag::Double(value) => {
writer.write_u8(6)?;
write_string(writer, key)?;
writer.write_f64::<BE>(*value)?
}
Tag::ByteArray(value) => {
writer.write_u8(7)?;
write_string(writer, key)?;
writer.write_i32::<BE>(value.len() as i32)?;
for &byte in value {
writer.write_i8(byte)?;
}
}
Tag::String(value) => {
writer.write_u8(8)?;
write_string(writer, key)?;
write_string(writer, value)?
}
Tag::List(value) => {
writer.write_u8(9)?;
write_string(writer, key)?;
write_list(writer, value)?
}
Tag::Compound(value) => {
writer.write_u8(10)?;
write_string(writer, key)?;
write_compound(writer, value, true)?
}
Tag::IntArray(value) => {
writer.write_u8(11)?;
write_string(writer, key)?;
writer.write_i32::<BE>(value.len() as i32)?;
for &int in value {
writer.write_i32::<BE>(int)?;
}
}
Tag::LongArray(value) => {
writer.write_u8(12)?;
write_string(writer, key)?;
writer.write_i32::<BE>(value.len() as i32)?;
for &long in value {
writer.write_i64::<BE>(long)?;
}
}
}
}
if end_tag {
writer.write_u8(Tag::End.id())?;
}
Ok(())
}
#[inline]
fn write_list(writer: &mut dyn Write, value: &[Tag]) -> Result<(), Error> {
// we just get the type from the first item, or default the type to END
if value.is_empty() {
writer.write_all(&[0; 5])?;
} else {
let first_tag = &value[0];
writer.write_u8(first_tag.id())?;
writer.write_i32::<BE>(value.len() as i32)?;
match first_tag {
Tag::Int(_) => {
for tag in value {
writer.write_i32::<BE>(
*tag.as_int().expect("List of Int should only contains Int"),
)?;
}
}
Tag::String(_) => {
for tag in value {
write_string(
writer,
tag.as_string()
.expect("List of String should only contain String"),
)?;
}
}
Tag::Compound(_) => {
for tag in value {
write_compound(
writer,
tag.as_compound()
.expect("List of Compound should only contain Compound"),
true,
)?;
}
}
_ => {
for tag in value {
tag.write_without_end(writer)?;
}
}
}
}
Ok(())
}
#[inline]
fn write_bytearray(writer: &mut dyn Write, value: &Vec<i8>) -> Result<(), Error> {
writer.write_i32::<BE>(value.len() as i32)?;
for &byte in value {
writer.write_i8(byte)?;
}
Ok(())
}
#[inline]
fn write_intarray(writer: &mut dyn Write, value: &Vec<i32>) -> Result<(), Error> {
writer.write_i32::<BE>(value.len() as i32)?;
for &int in value {
writer.write_i32::<BE>(int)?;
}
Ok(())
}
#[inline]
fn write_longarray(writer: &mut dyn Write, value: &Vec<i64>) -> Result<(), Error> {
writer.write_i32::<BE>(value.len() as i32)?;
for &long in value {
writer.write_i64::<BE>(long)?;
}
Ok(())
}
impl Tag {
#[inline]
pub fn write_without_end(&self, writer: &mut dyn Write) -> Result<(), Error> {
match self {
Tag::End => {}
Tag::Byte(value) => writer.write_i8(*value)?,
Tag::Short(value) => writer.write_i16::<BE>(*value)?,
Tag::Int(value) => writer.write_i32::<BE>(*value)?,
Tag::Long(value) => writer.write_i64::<BE>(*value)?,
Tag::Float(value) => writer.write_f32::<BE>(*value)?,
Tag::Double(value) => writer.write_f64::<BE>(*value)?,
Tag::ByteArray(value) => write_bytearray(writer, value)?,
Tag::String(value) => write_string(writer, value)?,
Tag::List(value) => write_list(writer, value)?,
Tag::Compound(value) => write_compound(writer, value, true)?,
Tag::IntArray(value) => write_intarray(writer, value)?,
Tag::LongArray(value) => write_longarray(writer, value)?,
}
Ok(())
}
pub fn write(&self, writer: &mut impl Write) -> Result<(), Error> {
match self {
Tag::Compound(value) => {
write_compound(writer, value, false)?;
Ok(())
}
_ => Err(Error::InvalidTag),
}
}
pub fn write_zlib(&self, writer: &mut impl Write) -> Result<(), Error> {
let mut encoder = ZlibEncoder::new(writer, flate2::Compression::default());
self.write(&mut encoder)
}
pub fn write_gzip(&self, writer: &mut impl Write) -> Result<(), Error> {
let mut encoder = GzEncoder::new(writer, flate2::Compression::default());
self.write(&mut encoder)
}
}
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