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extern crate chunking;
use chunking::*;
use std::io::Cursor;
fn random_data(seed: u64, size: usize) -> Vec<u8> {
assert_eq!(size % 4, 0);
let mut data = vec![0; size];
let a = 6364136223846793005;
let c = 1442695040888963407;
let mut v = seed;
for i in 0..size/4 {
v = v.wrapping_mul(a).wrapping_add(c);
data[4*i] = ((v >> 24) & 0xff) as u8;
data[4*i+1] = ((v >> 16) & 0xff) as u8;
data[4*i+2] = ((v >> 8) & 0xff) as u8;
data[4*i+3] = (v & 0xff) as u8;
}
data
}
fn test_chunking(chunker: &mut Chunker, data: &[u8]) -> usize {
let mut cursor = Cursor::new(&data);
let mut chunks = vec![];
let mut chunk = vec![];
while chunker.chunk(&mut cursor, &mut chunk).unwrap() == ChunkerStatus::Continue {
chunks.push(chunk);
chunk = vec![];
}
chunks.push(chunk);
let mut pos = 0;
for chunk in &chunks {
assert!(pos+chunk.len() <= data.len());
assert_eq!(&data[pos..pos+chunk.len()], chunk as &[u8]);
pos += chunk.len();
}
assert_eq!(pos, data.len());
chunks.len()
}
#[test]
fn test_fixed() {
let data = random_data(0, 10*1024*1024);
for n in &[1usize,2,4,8,16,32,64,128,256,512,1024] {
let mut chunker = FixedChunker::new(1024*n);
let len = test_chunking(&mut chunker, &data);
assert!(len >= data.len()/n/1024/4);
assert!(len <= data.len()/n/1024*4);
}
}
#[test]
fn test_ae() {
let data = random_data(0, 10*1024*1024);
for n in &[1usize,2,4,8,16,32,64,128,256,512,1024] {
let mut chunker = AeChunker::new(1024*n);
let len = test_chunking(&mut chunker, &data);
assert!(len >= data.len()/n/1024/4);
assert!(len <= data.len()/n/1024*4);
}
}
#[test]
fn test_rabin() {
let data = random_data(0, 10*1024*1024);
for n in &[1usize,2,4,8,16,32,64,128,256,512,1024] {
let mut chunker = RabinChunker::new(1024*n, 0);
let len = test_chunking(&mut chunker, &data);
assert!(len >= data.len()/n/1024/4);
assert!(len <= data.len()/n/1024*4);
}
}
#[test]
fn test_fastcdc() {
let data = random_data(0, 10*1024*1024);
for n in &[1usize,2,4,8,16,32,64,128,256,512,1024] {
let mut chunker = FastCdcChunker::new(1024*n, 0);
let len = test_chunking(&mut chunker, &data);
assert!(len >= data.len()/n/1024/4);
assert!(len <= data.len()/n/1024*4);
}
}