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