shenjack/nbt-rust
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我也不确定会不会优化，就先这么写吧（

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This commit is contained in:
shenjack 2024-01-13 02:30:53 +08:00
parent d0ce0ef3b3
commit 3168a2c8f6
Signed by: shenjack
GPG Key ID: 7B1134A979775551
2 changed files with 32 additions and 20 deletions
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51
v2/src/data_struct.rs
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@ -84,7 +84,7 @@ pub mod raw_reading {
/// 多少有点脱裤子放屁
#[inline(always)]
pub fn slice_as_byte_array(slice: &[u8]) -> Vec<i8> {
slice.iter().map(|&x| x as i8).collect::<Vec<i8>>()
unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i8, slice.len()).to_vec() }
}
/// unsafe 从这里开始
#[inline(always)]
@ -312,7 +312,12 @@ impl<'value> Value<'value> {
break;
}
let name_len = data.read_short();
let name = String::from_utf8(data.read_bytes(name_len as usize)).unwrap();
let name = if name_len != 0 {
let name = String::from_utf8(data.read_bytes(name_len as usize)).unwrap();
name
} else {
String::new()
};
let value = match type_id {
0 => break,
1 => Self::read_byte(data),
@ -321,33 +326,39 @@ impl<'value> Value<'value> {
4 => Self::read_long(data),
5 => Self::read_float(data),
6 => Self::read_double(data),
7 => {
let length = data.read_int();
let raw_data = data.read_bytes(length as usize);
let value = raw_reading::slice_as_byte_array(raw_data.as_slice());
Self::ByteArray(value)
}
7 => Self::read_byte_array(data),
8 => Self::read_string(data),
9 => Self::read_list(data),
10 => Self::read_compound(data),
11 => {
let length = data.read_int();
let raw_data = data.read_bytes(length as usize * 4);
let value = raw_reading::slice_as_int_array(raw_data.as_slice()).unwrap();
Self::IntArray(value)
}
12 => {
let length = data.read_int();
let raw_data = data.read_bytes(length as usize * 8);
let value = raw_reading::slice_as_long_array(raw_data.as_slice()).unwrap();
Self::LongArray(value)
}
11 => Self::read_int_array(data),
12 => Self::read_long_array(data),
_ => panic!("WTF, type_id = {}", type_id),
};
list.push((name, value));
}
Self::Compound(list)
}
#[inline(always)]
pub fn read_byte_array(data: &mut NbtData) -> Self {
let length = data.read_int();
let raw_data = data.read_bytes(length as usize);
let value = raw_reading::slice_as_byte_array(raw_data.as_slice());
Self::ByteArray(value)
}
#[inline(always)]
pub fn read_int_array(data: &mut NbtData) -> Self {
let length = data.read_int();
let raw_data = data.read_bytes(length as usize * 4);
let value = raw_reading::slice_as_int_array(raw_data.as_slice()).unwrap();
Self::IntArray(value)
}
#[inline(always)]
pub fn read_long_array(data: &mut NbtData) -> Self {
let length = data.read_int();
let raw_data = data.read_bytes(length as usize * 8);
let value = raw_reading::slice_as_long_array(raw_data.as_slice()).unwrap();
Self::LongArray(value)
}
pub fn as_byte(&self) -> Option<i8> {
match self {
Self::Byte(value) => Some(*value),

1
v2/src/main.rs
View File

@ -137,6 +137,7 @@ fn big_read_test() {
fn read_test(data: Vec<u8>) {
let len = data.len();
println!("file size: {}", len);
let start_time = std::time::Instant::now();
let _data = data_struct::Value::from_vec(data);
let end_time = std::time::Instant::now();