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/// Salt as defined in the [spec](https://github.com/apache/parquet-format/blob/master/BloomFilter.md#technical-approach). const SALT: [u32; 8] = [ 0x47b6137b_u32, 0x44974d91_u32, 0x8824ad5b_u32, 0xa2b7289d_u32, 0x705495c7_u32, 0x2df1424b_u32, 0x9efc4947_u32, 0x5c6bfb31_u32, ]; /// Each block is 256 bits, broken up into eight contiguous "words", each consisting of 32 bits. /// Each word is thought of as an array of bits; each bit is either "set" or "not set". #[derive(Copy, Clone)] pub struct Block([u32; 8]); impl Block { const ZERO: Block = Block([0; 8]); /// takes as its argument a single unsigned 32-bit integer and returns a block in which each /// word has exactly one bit set. fn mask(x: u32) -> Self { let mut result = [0_u32; 8]; for i in 0..8 { // wrapping instead of checking for overflow let y = x.wrapping_mul(SALT[i]); let y = y >> 27; result[i] = 1 << y; } Self(result) } #[inline] #[cfg(target_endian = "little")] fn to_le_bytes(self) -> [u8; 32] { self.to_ne_bytes() } #[inline] #[cfg(not(target_endian = "little"))] fn to_le_bytes(self) -> [u8; 32] { self.swap_bytes().to_ne_bytes() } #[inline] fn to_ne_bytes(self) -> [u8; 32] { unsafe { std::mem::transmute(self) } } #[inline] #[cfg(not(target_endian = "little"))] fn swap_bytes(mut self) -> Self { self.0.iter_mut().for_each(|x| *x = x.swap_bytes()); self } /// setting every bit in the block that was also set in the result from mask pub fn insert(&mut self, hash: u32) { let mask = Self::mask(hash); for i in 0..8 { self[i] |= mask[i]; } } /// returns true when every bit that is set in the result of mask is also set in the block. pub fn check(&self, hash: u32) -> bool { let mask = Self::mask(hash); let mut res = true; for i in 0..8 { res &= self[i] & mask[i] != 0 } res } } impl std::ops::Index<usize> for Block { type Output = u32; #[inline] fn index(&self, index: usize) -> &Self::Output { self.0.index(index) } } impl std::ops::IndexMut<usize> for Block { #[inline] fn index_mut(&mut self, index: usize) -> &mut Self::Output { self.0.index_mut(index) } }
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