优化读取函数,添加安全性检查和文档注释
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@ -37,13 +37,7 @@ macro_rules! read_uncheck {
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macro_rules! read {
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macro_rules! read {
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($name:ident, $ty:ty, $size:literal) => {
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($name:ident, $ty:ty, $size:literal) => {
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#[doc = concat!("读取 ", stringify!($ty), " 类型 ", $size, " 长度的数据")]
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#[doc = concat!("读取 ", stringify!($ty), " 类型 ", $size, " 长度的数据")]
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pub fn $name(&mut self) -> $ty {
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pub fn $name(&mut self) -> $ty { let buff = &self.data[self.cursor..self.cursor + $size]; }
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let value = self.data[self.cursor..self.cursor + $size]
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.iter()
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.fold(0, |acc, &x| (acc << 8) | x as $ty);
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self.cursor += $size;
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value
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}
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};
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};
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}
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}
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@ -71,6 +65,68 @@ impl NbtReader<'_> {
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read_uncheck!(read_u32_unchecked, u32, 4);
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read_uncheck!(read_u32_unchecked, u32, 4);
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read_uncheck!(read_i64_unchecked, i64, 8);
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read_uncheck!(read_i64_unchecked, i64, 8);
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read_uncheck!(read_u64_unchecked, u64, 8);
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read_uncheck!(read_u64_unchecked, u64, 8);
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/// 安全的读取 i16 类型的数据
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///
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/// 转换大小端(大端)
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///
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/// 会在超出长度时 panic
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pub fn read_i16(&mut self) -> i16 {
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let value = i16::from_be_bytes([self.data[self.cursor], self.data[self.cursor + 1]]);
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self.cursor += 2;
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value
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}
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/// 安全的读取 u16 类型的数据
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///
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/// 转换大小端(大端)
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///
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/// 会在超出长度时 panic
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pub fn read_u16(&mut self) -> u16 { self.read_i16() as u16 }
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/// 安全的读取 i32 类型的数据
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///
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/// 转换大小端(大端)
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///
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/// 会在超出长度时 panic
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pub fn read_i32(&mut self) -> i32 {
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let value = i32::from_be_bytes([
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self.data[self.cursor],
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self.data[self.cursor + 1],
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self.data[self.cursor + 2],
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self.data[self.cursor + 3],
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]);
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self.cursor += 4;
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value
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}
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/// 安全的读取 u32 类型的数据
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///
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/// 转换大小端(大端)
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///
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/// 会在超出长度时 panic
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pub fn read_u32(&mut self) -> u32 { self.read_i32() as u32 }
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/// 安全的读取 i64 类型的数据
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///
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/// 转换大小端(大端)
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///
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/// 会在超出长度时 panic
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pub fn read_i64(&mut self) -> i64 {
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let value = i64::from_be_bytes([
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self.data[self.cursor],
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self.data[self.cursor + 1],
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self.data[self.cursor + 2],
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self.data[self.cursor + 3],
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self.data[self.cursor + 4],
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self.data[self.cursor + 5],
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self.data[self.cursor + 6],
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self.data[self.cursor + 7],
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]);
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self.cursor += 8;
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value
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}
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/// 安全的读取 u64 类型的数据
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///
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/// 转换大小端(大端)
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///
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/// 会在超出长度时 panic
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pub fn read_u64(&mut self) -> u64 { self.read_i64() as u64 }
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/// 读取一个 f32 类型的数据
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/// 读取一个 f32 类型的数据
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///
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///
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/// 转换大小端
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/// 转换大小端
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@ -94,12 +150,21 @@ impl NbtReader<'_> {
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self.cursor += 8;
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self.cursor += 8;
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f64::from_bits(value.to_be())
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f64::from_bits(value.to_be())
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}
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}
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/// 读取指定长度的 u8 数组
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///
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/// # 安全性
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///
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/// 长度溢出会导致 panic
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pub fn read_u8_array(&mut self, len: usize) -> &[u8] {
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pub fn read_u8_array(&mut self, len: usize) -> &[u8] {
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let value = &self.data[self.cursor..self.cursor + len];
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let value = &self.data[self.cursor..self.cursor + len];
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self.cursor += len;
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self.cursor += len;
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value
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value
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}
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}
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/// 读取指定长度的 i8 数组
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///
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/// # 安全性
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///
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/// 长度溢出会导致 UB
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pub fn read_i8_array(&mut self, len: usize) -> &[i8] {
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pub fn read_i8_array(&mut self, len: usize) -> &[i8] {
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let value = unsafe {
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let value = unsafe {
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std::slice::from_raw_parts(self.data[self.cursor..].as_ptr() as *const i8, len)
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std::slice::from_raw_parts(self.data[self.cursor..].as_ptr() as *const i8, len)
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@ -107,12 +172,17 @@ impl NbtReader<'_> {
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self.cursor += len;
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self.cursor += len;
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value
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value
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}
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}
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/// 读取指定长度的 utf-8 字符串
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///
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/// # 安全性
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///
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/// 长度溢出会导致 panic
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pub fn read_string(&mut self, len: usize) -> String {
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pub fn read_string(&mut self, len: usize) -> String {
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let value = String::from_utf8_lossy(&self.data[self.cursor..self.cursor + len]);
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let value = String::from_utf8_lossy(&self.data[self.cursor..self.cursor + len]);
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self.cursor += len;
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self.cursor += len;
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value.into_owned()
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value.into_owned()
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}
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}
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pub fn read_int_array(&mut self, len: usize) -> &[i32] {
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pub fn read_i32_array_unchecked(&mut self, len: usize) -> &[i32] {
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unsafe {
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unsafe {
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println!("data: {:?}", self.data);
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println!("data: {:?}", self.data);
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let value =
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let value =
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@ -125,7 +195,7 @@ impl NbtReader<'_> {
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value
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value
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}
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}
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}
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}
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pub fn read_long_array(&mut self, len: usize) -> &[i64] {
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pub fn read_i64_array(&mut self, len: usize) -> &[i64] {
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unsafe {
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unsafe {
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println!("data: {:?}", self.data);
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println!("data: {:?}", self.data);
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let value =
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let value =
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@ -65,7 +65,7 @@ fn read_array() {
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fn read_int_array() {
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fn read_int_array() {
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let mut value = 1234567890_i32.to_be_bytes();
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let mut value = 1234567890_i32.to_be_bytes();
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let mut reader = NbtReader::new(&mut value);
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let mut reader = NbtReader::new(&mut value);
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assert_eq!(reader.read_int_array(1), &[1234567890_i32]);
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assert_eq!(reader.read_i32_array_unchecked(1), &[1234567890_i32]);
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assert_eq!(reader.cursor, 4);
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assert_eq!(reader.cursor, 4);
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}
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}
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@ -73,6 +73,6 @@ fn read_int_array() {
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fn read_long_array() {
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fn read_long_array() {
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let mut value = 1234567890_i64.to_be_bytes();
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let mut value = 1234567890_i64.to_be_bytes();
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let mut reader = NbtReader::new(&mut value);
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let mut reader = NbtReader::new(&mut value);
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assert_eq!(reader.read_long_array(1), &[1234567890_i64]);
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assert_eq!(reader.read_i64_array(1), &[1234567890_i64]);
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assert_eq!(reader.cursor, 8);
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assert_eq!(reader.cursor, 8);
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}
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}
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