大端序啊喂!

2000MB/s!
This commit is contained in:
shenjack 2024-01-13 01:40:13 +08:00
parent 5c0ef76028
commit b78187b3f2
Signed by: shenjack
GPG Key ID: 7B1134A979775551
2 changed files with 202 additions and 27 deletions

View File

@ -1,4 +1,4 @@
use std::{borrow::Cow, collections::HashMap};
use std::borrow::Cow;
/// NBT 里除了字符串的长度量都是 i32
#[allow(unused)]
@ -31,12 +31,12 @@ impl NbtData {
value
}
pub fn read_short(&mut self) -> i16 {
let value = i16::from_le_bytes([self.data[self.head], self.data[self.head + 1]]);
let value = i16::from_be_bytes([self.data[self.head], self.data[self.head + 1]]);
self.head += 2;
value
}
pub fn read_int(&mut self) -> i32 {
let value = i32::from_le_bytes([
let value = i32::from_be_bytes([
self.data[self.head],
self.data[self.head + 1],
self.data[self.head + 2],
@ -46,7 +46,7 @@ impl NbtData {
value
}
pub fn read_long(&mut self) -> i64 {
let value = i64::from_le_bytes([
let value = i64::from_be_bytes([
self.data[self.head],
self.data[self.head + 1],
self.data[self.head + 2],
@ -60,7 +60,7 @@ impl NbtData {
value
}
pub fn read_float(&mut self) -> f32 {
let value = f32::from_le_bytes([
let value = f32::from_be_bytes([
self.data[self.head],
self.data[self.head + 1],
self.data[self.head + 2],
@ -70,7 +70,7 @@ impl NbtData {
value
}
pub fn read_double(&mut self) -> f64 {
let value = f64::from_le_bytes([
let value = f64::from_be_bytes([
self.data[self.head],
self.data[self.head + 1],
self.data[self.head + 2],
@ -102,7 +102,7 @@ pub mod raw_reading {
} else {
(slice.len() / 2) as usize
};
Some(unsafe { Vec::from_raw_parts(slice.as_ptr() as *mut i16, length, length) })
Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i16, length).to_vec() })
}
/// 开始 unsafe 了
/// unsafe rust, 小子!
@ -112,7 +112,7 @@ pub mod raw_reading {
} else {
(slice.len() / 4) as usize
};
Some(unsafe { Vec::from_raw_parts(slice.as_ptr() as *mut i32, 4, length) })
Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i32, length).to_vec() })
}
/// 这边也是 unsafe 捏
pub fn slice_as_long_array(slice: &[u8]) -> Option<Vec<i64>> {
@ -121,7 +121,7 @@ pub mod raw_reading {
} else {
(slice.len() / 8) as usize
};
Some(unsafe { Vec::from_raw_parts(slice.as_ptr() as *mut i64, 8, length) })
Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i64, length).to_vec() })
}
/// 这边也是 unsafe 捏
pub fn slice_as_float_array(slice: &[u8]) -> Option<Vec<f32>> {
@ -130,7 +130,7 @@ pub mod raw_reading {
} else {
(slice.len() / 4) as usize
};
Some(unsafe { Vec::from_raw_parts(slice.as_ptr() as *mut f32, 4, length) })
Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut f32, length).to_vec() })
}
/// 这边也是 unsafe 捏
pub fn slice_as_double_array(slice: &[u8]) -> Option<Vec<f64>> {
@ -139,11 +139,12 @@ pub mod raw_reading {
} else {
(slice.len() / 8) as usize
};
Some(unsafe { Vec::from_raw_parts(slice.as_ptr() as *mut f64, 8, length) })
Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut f64, length).to_vec() })
}
}
#[allow(unused)]
#[derive(Debug)]
pub enum Value<'value> {
// 还有一个 End: 0
/// 1
@ -169,11 +170,11 @@ pub enum Value<'value> {
/// 9
List(ListContent<'value>),
/// 10
Compound(HashMap<Cow<'value, str>, Value<'value>>),
Compound(Vec<(String, Value<'value>)>),
}
#[allow(unused)]
#[allow(unused)]
#[derive(Debug)]
pub enum ListContent<'value> {
ByteList(Vec<i8>),
ShortList(Vec<i16>),
@ -185,7 +186,7 @@ pub enum ListContent<'value> {
ByteArrayList(Vec<Vec<i8>>),
IntArrayList(Vec<Vec<i32>>),
LongArrayList(Vec<Vec<i64>>),
CompoundList(Vec<HashMap<String, Value<'value>>>),
CompoundList(Vec<Vec<(String, Value<'value>)>>),
ListList(Vec<ListContent<'value>>),
}
@ -272,16 +273,19 @@ impl<'value> Value<'value> {
let mut list = Vec::with_capacity(length as usize);
for _ in 0..length {
let inner_list = Self::read_list(data);
let value = match inner_list {
Self::List(value) => value,
_ => panic!("WTF, type_id = {}", type_id),
};
let value = inner_list.into_list().unwrap();
list.push(value);
}
Self::List(ListContent::ListList(list))
}
10 => {
todo!("CompoundList, wait for Compound impl")
let mut list = Vec::with_capacity(length as usize);
for _ in 0..length {
let inner_compound = Self::read_compound(data);
let value = inner_compound.into_compound().unwrap();
list.push(value);
}
Self::List(ListContent::CompoundList(list))
}
11 => {
let mut list = Vec::with_capacity(length as usize);
@ -308,9 +312,12 @@ impl<'value> Value<'value> {
}
pub fn read_compound(data: &mut NbtData) -> Self {
let mut type_id = 1;
let mut map = std::collections::HashMap::new();
let mut list = vec![];
while type_id != 0 {
type_id = data.read_byte();
if type_id == 0 {
break;
}
let name_len = data.read_short();
let name = String::from_utf8(data.read_bytes(name_len as usize)).unwrap();
let value = match type_id {
@ -344,9 +351,9 @@ impl<'value> Value<'value> {
}
_ => panic!("WTF, type_id = {}", type_id),
};
map.insert(name.into(), value);
list.push((name, value));
}
Self::Compound(map)
Self::Compound(list)
}
pub fn as_byte(&self) -> Option<i8> {
match self {
@ -396,28 +403,49 @@ impl<'value> Value<'value> {
_ => None,
}
}
pub fn as_compound(&self) -> Option<&HashMap<Cow<'value, str>, Value<'value>>> {
pub fn as_compound(&self) -> Option<&Vec<(String, Value<'value>)>> {
match self {
Self::Compound(value) => Some(value),
_ => None,
}
}
pub fn as_byte_array(&self) -> Option<&[i8]> {
pub fn as_byte_array(&self) -> Option<&Vec<i8>> {
match self {
Self::ByteArray(value) => Some(value),
_ => None,
}
}
pub fn as_int_array(&self) -> Option<&[i32]> {
pub fn as_int_array(&self) -> Option<&Vec<i32>> {
match self {
Self::IntArray(value) => Some(value),
_ => None,
}
}
pub fn as_long_array(&self) -> Option<&[i64]> {
pub fn as_long_array(&self) -> Option<&Vec<i64>> {
match self {
Self::LongArray(value) => Some(value),
_ => None,
}
}
pub fn into_list(self) -> Option<ListContent<'value>> {
match self {
Self::List(value) => Some(value),
_ => None,
}
}
pub fn into_compound(self) -> Option<Vec<(String, Value<'value>)>> {
match self {
Self::Compound(value) => Some(value),
_ => None,
}
}
pub fn from_vec(data: Vec<u8>) -> Self {
let mut nbt_data = NbtData::new(data);
let _type_id = nbt_data.read_byte();
let _name_len = nbt_data.read_short();
println!("{} {}", _type_id, _name_len);
let name = String::from_utf8(nbt_data.read_bytes(_name_len as usize)).unwrap();
println!("{}", name);
Value::read_compound(&mut nbt_data)
}
}

View File

@ -1,5 +1,152 @@
mod data_struct;
fn main() {
println!("Hello, world!");
small_read_test();
big_read_test();
cli_read_test();
}
fn cli_read_test() {
let mut args = std::env::args();
// 如果有, 取出
if let Some(arg) = args.nth(1) {
let data = std::fs::read(arg).unwrap();
read_test(data);
} else {
println!("Usage: cargo run --release -- <file>");
}
}
fn small_read_test() {
let data: [u8; 0x21] = [
0x0A, 0x00, 0x0B, 0x68, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0x64, 0x08,
0x00, 0x04, 0x6E, 0x61, 0x6D, 0x65, 0x00, 0x09, 0x42, 0x61, 0x6E, 0x61, 0x6E, 0x72, 0x61,
0x6D, 0x61, 0x00,
];
read_test(data.to_vec());
}
fn big_read_test() {
let data: [u8; 0x608] = [
0x0A, 0x00, 0x05, 0x4C, 0x65, 0x76, 0x65, 0x6C, 0x04, 0x00, 0x08, 0x6C, 0x6F, 0x6E, 0x67,
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];
read_test(data.to_vec());
}
fn read_test(data: Vec<u8>) {
let len = data.len();
let start_time = std::time::Instant::now();
let data = data_struct::Value::from_vec(data);
let end_time = std::time::Instant::now();
println!("===local nbt===");
println!("time: {:?}", end_time - start_time);
println!("speed: {:?} (bytes/sec)", len as f64 / (end_time - start_time).as_secs_f64());
println!("{:?} (kb/sec)", len as f64 / (end_time - start_time).as_secs_f64() / 1024.0);
println!(
"{:?} (mb/sec)",
len as f64 / (end_time - start_time).as_secs_f64() / 1024.0 / 1024.0
);
// println!("{:?}", data);
}