mirror of https://github.com/dswd/zvault
87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
pub use chunking::*;
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use std::str::FromStr;
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#[derive(Debug, Clone, Copy, Eq, PartialEq)]
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pub enum ChunkerType {
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Ae(usize),
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Rabin((usize, u32)),
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FastCdc((usize, u64)),
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Fixed(usize)
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}
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serde_impl!(ChunkerType(u64) {
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Ae(usize) => 1,
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Rabin((usize, u32)) => 2,
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FastCdc((usize, u64)) => 3,
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Fixed(usize) => 4
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});
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impl ChunkerType {
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pub fn from(name: &str, avg_size: usize, seed: u64) -> Result<Self, &'static str> {
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match name {
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"ae" => Ok(ChunkerType::Ae(avg_size)),
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"rabin" => Ok(ChunkerType::Rabin((avg_size, seed as u32))),
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"fastcdc" => Ok(ChunkerType::FastCdc((avg_size, seed))),
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"fixed" => Ok(ChunkerType::Fixed(avg_size)),
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_ => Err("Unsupported chunker type"),
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}
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}
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pub fn from_string(name: &str) -> Result<Self, &'static str> {
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let (name, size) = if let Some(pos) = name.find('/') {
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let size = try!(usize::from_str(&name[pos + 1..]).map_err(
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|_| "Chunk size must be a number"
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));
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let name = &name[..pos];
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(name, size)
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} else {
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(name, 8)
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};
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Self::from(name, size * 1024, 0)
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}
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#[inline]
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pub fn create(&self) -> Box<Chunker> {
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match *self {
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ChunkerType::Ae(size) => Box::new(AeChunker::new(size)),
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ChunkerType::Rabin((size, seed)) => Box::new(RabinChunker::new(size, seed)),
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ChunkerType::FastCdc((size, seed)) => Box::new(FastCdcChunker::new(size, seed)),
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ChunkerType::Fixed(size) => Box::new(FixedChunker::new(size)),
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}
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}
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pub fn name(&self) -> &'static str {
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match *self {
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ChunkerType::Ae(_size) => "ae",
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ChunkerType::Rabin((_size, _seed)) => "rabin",
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ChunkerType::FastCdc((_size, _seed)) => "fastcdc",
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ChunkerType::Fixed(_size) => "fixed",
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}
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}
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pub fn avg_size(&self) -> usize {
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match *self {
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ChunkerType::Ae(size) |
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ChunkerType::Fixed(size) => size,
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ChunkerType::Rabin((size, _seed)) => size,
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ChunkerType::FastCdc((size, _seed)) => size,
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}
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}
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pub fn to_string(&self) -> String {
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format!("{}/{}", self.name(), self.avg_size() / 1024)
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}
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pub fn seed(&self) -> u64 {
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match *self {
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ChunkerType::Ae(_size) |
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ChunkerType::Fixed(_size) => 0,
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ChunkerType::Rabin((_size, seed)) => seed as u64,
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ChunkerType::FastCdc((_size, seed)) => seed,
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}
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}
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}
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