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Signed-off-by: Yuchen Liang <yuchen@neon.tech>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| use std::ops::{Deref, DerefMut}; | ||
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| use aligned_vec::AVec; | ||
| use bytes::buf::UninitSlice; | ||
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| pub struct IoBufferMut(AVec<u8, aligned_vec::RuntimeAlign>); | ||
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| impl IoBufferMut { | ||
| pub fn new(align: usize) -> Self { | ||
| IoBufferMut(AVec::new(align)) | ||
| } | ||
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| #[inline] | ||
| pub fn with_capacity(align: usize, capacity: usize) -> Self { | ||
| IoBufferMut(AVec::with_capacity(align, capacity)) | ||
| } | ||
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| #[inline] | ||
| pub fn capacity(&self) -> usize { | ||
| self.0.capacity() | ||
| } | ||
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| #[inline] | ||
| pub fn reserve(&mut self, additional: usize) { | ||
| self.0.reserve(additional) | ||
| } | ||
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| pub unsafe fn set_len(&mut self, new_len: usize) { | ||
| self.0.set_len(new_len) | ||
| } | ||
| } | ||
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| impl Deref for IoBufferMut { | ||
| type Target = [u8]; | ||
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| fn deref(&self) -> &Self::Target { | ||
| self.0.deref() | ||
| } | ||
| } | ||
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| impl DerefMut for IoBufferMut { | ||
| fn deref_mut(&mut self) -> &mut Self::Target { | ||
| self.0.deref_mut() | ||
| } | ||
| } | ||
|
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| unsafe impl bytes::BufMut for IoBufferMut { | ||
| #[inline] | ||
| fn remaining_mut(&self) -> usize { | ||
| // A vector can never have more than isize::MAX bytes | ||
| core::isize::MAX as usize - self.len() | ||
| } | ||
|
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| #[inline] | ||
| unsafe fn advance_mut(&mut self, cnt: usize) { | ||
| let len = self.len(); | ||
| let remaining = self.0.capacity() - len; | ||
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| if remaining < cnt { | ||
| panic_advance(cnt, remaining); | ||
| } | ||
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| // Addition will not overflow since the sum is at most the capacity. | ||
| self.set_len(len + cnt); | ||
| } | ||
|
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| #[inline] | ||
| fn chunk_mut(&mut self) -> &mut bytes::buf::UninitSlice { | ||
| if self.capacity() == self.len() { | ||
| self.reserve(self.0.alignment()); // Grow the vec by alignment | ||
| } | ||
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| let cap = self.capacity(); | ||
| let len = self.len(); | ||
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| let ptr = self.as_mut_ptr(); | ||
| // SAFETY: Since `ptr` is valid for `cap` bytes, `ptr.add(len)` must be | ||
| // valid for `cap - len` bytes. The subtraction will not underflow since | ||
| // `len <= cap`. | ||
| unsafe { UninitSlice::from_raw_parts_mut(ptr.add(len), cap - len) } | ||
| } | ||
| } | ||
|
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| /// Panic with a nice error message. | ||
| #[cold] | ||
| fn panic_advance(idx: usize, len: usize) -> ! { | ||
| panic!( | ||
| "advance out of bounds: the len is {} but advancing by {}", | ||
| len, idx | ||
| ); | ||
| } | ||
|
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| // #[cold] | ||
| // fn panic_does_not_fit(size: usize, nbytes: usize) -> ! { | ||
| // panic!( | ||
| // "size too large: the integer type can fit {} bytes, but nbytes is {}", | ||
| // size, nbytes | ||
| // ); | ||
| // } |