85 lines
2.4 KiB
Rust
85 lines
2.4 KiB
Rust
|
use failure::*;
|
||
|
|
||
|
use super::chunk_store::*;
|
||
|
|
||
|
use std::path::{Path, PathBuf};
|
||
|
use std::os::unix::io::AsRawFd;
|
||
|
|
||
|
|
||
|
// split image into fixed size chunks
|
||
|
|
||
|
pub struct ImageIndex<'a> {
|
||
|
store: &'a mut ChunkStore,
|
||
|
chunk_size: usize,
|
||
|
size: usize,
|
||
|
index: *mut u8,
|
||
|
}
|
||
|
|
||
|
impl <'a> ImageIndex<'a> {
|
||
|
|
||
|
pub fn create(store: &'a mut ChunkStore, path: &Path, size: usize) -> Result<Self, Error> {
|
||
|
|
||
|
let full_path = store.relative_path(path);
|
||
|
println!("FULLPATH: {:?} {}", full_path, size);
|
||
|
|
||
|
let mut file = std::fs::OpenOptions::new()
|
||
|
.create_new(true)
|
||
|
.read(true)
|
||
|
.write(true)
|
||
|
.open(&full_path)?;
|
||
|
|
||
|
let chunk_size = 64*1024;
|
||
|
let index_size = ((size + chunk_size - 1)/chunk_size)*32;
|
||
|
nix::unistd::ftruncate(file.as_raw_fd(), index_size as i64)?;
|
||
|
println!("SIZES: {}", index_size);
|
||
|
|
||
|
let data = unsafe { nix::sys::mman::mmap(
|
||
|
std::ptr::null_mut(),
|
||
|
index_size,
|
||
|
nix::sys::mman::ProtFlags::PROT_READ | nix::sys::mman::ProtFlags::PROT_WRITE,
|
||
|
nix::sys::mman::MapFlags::MAP_SHARED,
|
||
|
file.as_raw_fd(),
|
||
|
0) }? as *mut u8;
|
||
|
|
||
|
Ok(Self {
|
||
|
store,
|
||
|
chunk_size,
|
||
|
size,
|
||
|
index: data,
|
||
|
})
|
||
|
}
|
||
|
|
||
|
// Note: We want to add data out of order, so do not assume and order here.
|
||
|
pub fn add_chunk(&mut self, pos: usize, chunk: &[u8]) -> Result<(), Error> {
|
||
|
|
||
|
let end = pos + chunk.len();
|
||
|
|
||
|
if end > self.size {
|
||
|
bail!("write chunk data exceeds size ({} >= {})", end, self.size);
|
||
|
}
|
||
|
|
||
|
// last chunk can be smaller
|
||
|
if ((end != self.size) && (chunk.len() != self.chunk_size)) ||
|
||
|
(chunk.len() > self.chunk_size) || (chunk.len() == 0) {
|
||
|
bail!("got chunk with wrong length ({} != {}", chunk.len(), self.chunk_size);
|
||
|
}
|
||
|
|
||
|
if pos >= self.size { bail!("add chunk after end ({} >= {})", pos, self.size); }
|
||
|
|
||
|
if pos & (self.chunk_size-1) != 0 { bail!("add unaligned chunk (pos = {})", pos); }
|
||
|
|
||
|
|
||
|
let (is_duplicate, digest) = self.store.insert_chunk(chunk)?;
|
||
|
|
||
|
println!("ADD CHUNK {} {} {} {}", pos, chunk.len(), is_duplicate, u256_to_hex(&digest));
|
||
|
|
||
|
let index_pos = (pos/self.chunk_size)*32;
|
||
|
unsafe {
|
||
|
let dst = self.index.add(index_pos);
|
||
|
dst.copy_from_nonoverlapping(digest.as_ptr(), 32);
|
||
|
}
|
||
|
|
||
|
Ok(())
|
||
|
}
|
||
|
}
|