diff options
Diffstat (limited to 'ripple/fossil/src/chunker/mod.rs')
| -rw-r--r-- | ripple/fossil/src/chunker/mod.rs | 432 |
1 files changed, 432 insertions, 0 deletions
diff --git a/ripple/fossil/src/chunker/mod.rs b/ripple/fossil/src/chunker/mod.rs new file mode 100644 index 0000000..0045646 --- /dev/null +++ b/ripple/fossil/src/chunker/mod.rs @@ -0,0 +1,432 @@ +// SPDX-FileCopyrightText: edef <edef@unfathomable.blue> +// SPDX-License-Identifier: OSL-3.0 + +use std::mem; + +mod buz; + +pub const MIN_CHUNK_SIZE: usize = AVG_CHUNK_SIZE / 4; +pub const AVG_CHUNK_SIZE: usize = 64 * 1024; +pub const MAX_CHUNK_SIZE: usize = AVG_CHUNK_SIZE * 4; + +fn discriminator_from_average(avg: u64) -> u32 { + let avg = avg as f64; + (avg / (-1.42888852e-7 * avg + 1.33237515)) as u32 +} + +#[derive(Clone)] +pub struct Chunker<'a> { + buffer: &'a [u8], +} + +impl<'a> Chunker<'a> { + pub fn from(buffer: &'a [u8]) -> Chunker<'a> { + Chunker { buffer } + } +} + +impl<'a> Iterator for Chunker<'a> { + type Item = &'a [u8]; + fn next(&mut self) -> Option<&'a [u8]> { + if self.buffer.is_empty() { + return None; + } + + if self.buffer.len() <= MIN_CHUNK_SIZE { + return Some(mem::take(&mut self.buffer)); + } + + let bytes = self + .buffer + .iter() + .cloned() + .enumerate() + .take(MAX_CHUNK_SIZE) + .skip(MIN_CHUNK_SIZE); + + let d = discriminator_from_average(AVG_CHUNK_SIZE as u64); + let mut hasher = buz::Rolling::<48>::from_slice(&self.buffer[..MIN_CHUNK_SIZE]); + let chunk; + for (idx, byte) in bytes { + hasher.push(byte); + let buz::Hash(x) = hasher.sum(); + if x % d == d.wrapping_sub(1) { + // split point + (chunk, self.buffer) = self.buffer.split_at(idx + 1); + return Some(chunk); + } + } + + (chunk, self.buffer) = self.buffer.split_at(MAX_CHUNK_SIZE.min(self.buffer.len())); + Some(chunk) + } + + fn size_hint(&self) -> (usize, Option<usize>) { + if self.buffer.is_empty() { + return (0, Some(0)); + } + let min = (self.buffer.len() + MAX_CHUNK_SIZE - 1) / MAX_CHUNK_SIZE; + let max = (self.buffer.len() + MIN_CHUNK_SIZE - 1) / MIN_CHUNK_SIZE; + (min, Some(max)) + } +} + +#[cfg(test)] +mod test { + use std::io::Read; + + fn generate(length: usize) -> Vec<u8> { + let mut h = blake3::Hasher::new(); + h.update(b"test vector"); + let mut buf = vec![0; length]; + h.finalize_xof().read_exact(&mut buf).unwrap(); + buf + } + + const GOLDEN: &[[u8; 32]] = &[ + [ + 0x66, 0x77, 0xd1, 0xf7, 0x78, 0xbf, 0x7b, 0x42, 0x91, 0x15, 0x16, 0xda, 0xde, 0xae, + 0x69, 0x17, 0x59, 0xe9, 0x73, 0xe8, 0x5b, 0xa2, 0xa0, 0x92, 0x6f, 0x98, 0x76, 0x8c, + 0xbb, 0xb4, 0x74, 0xc7, + ], + [ + 0xad, 0xd6, 0xc0, 0x6e, 0x0e, 0xef, 0xb5, 0x3b, 0x1f, 0x8b, 0xeb, 0xac, 0x21, 0xa8, + 0xf7, 0x0c, 0xc9, 0xeb, 0xc8, 0x20, 0x22, 0xf0, 0xfe, 0x0a, 0x72, 0x15, 0x15, 0x21, + 0x32, 0x7d, 0xe5, 0x0a, + ], + [ + 0xbc, 0xd0, 0x68, 0x57, 0x0a, 0x66, 0x70, 0xf3, 0x3e, 0x81, 0xc9, 0xa8, 0x7d, 0xac, + 0xd9, 0xde, 0x80, 0xb9, 0x8a, 0x19, 0x8d, 0x54, 0xcd, 0xd7, 0x5e, 0x76, 0xca, 0x0f, + 0xb0, 0x0d, 0x53, 0x11, + ], + [ + 0x91, 0x16, 0x6f, 0x72, 0x92, 0x3d, 0x00, 0xbb, 0x46, 0x82, 0x7a, 0xc5, 0x35, 0xda, + 0x0c, 0x6e, 0x20, 0xbc, 0x1a, 0xb0, 0xb8, 0x40, 0x58, 0x0b, 0xf4, 0xc4, 0xe3, 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