26 lines
591 B
Rust
26 lines
591 B
Rust
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pub fn load_u16_le(bytes: &[u8]) -> u16 {
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assert_eq!(bytes.len(), 2);
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u16::from_le_bytes(bytes.try_into().unwrap())
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}
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pub fn load_u32_le(bytes: &[u8]) -> u32 {
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assert_eq!(bytes.len(), 4);
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u32::from_le_bytes(bytes.try_into().unwrap())
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}
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/// replace the value at x with f(x)
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///
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/// SAFETY:
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/// should be safe, I guess? MIRI didn't complain about it
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pub fn replace<T>(x: &mut T, f: impl FnOnce(T) -> T) {
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unsafe {
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let x_ptr = x as *mut T;
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let old_x = std::ptr::read(x_ptr);
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let new_x = f(old_x);
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std::ptr::write(x_ptr, new_x);
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}
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}
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