bita¶

A pure-Go, cgo-free reimplementation of oll3/bita: differential file synchronization over HTTP. bita chunks a file with a content-defined rolling-hash chunker, stores unique chunks in a compressed .cba archive, and reconstructs ("clones") the file by reusing chunks already available locally (the seeds) and fetching only the rest. Wire-compatible with the Rust bita (RollSum and BuzHash), verified both directions.

Repository: github.com/go-deltasync/bita

go install github.com/go-deltasync/bita/cmd/bita@latest

Quick start¶

bita compress -i disk.img disk.cba

# reconstruct from an archive, reusing a local seed (local path or http(s) URL):
bita clone --seed v1.img https://example.com/v2.cba v2.img --verify-output
# cloned 4194304 bytes (4142202 from seeds, 52102 from archive)

bita info disk.cba

Library¶

import "github.com/go-deltasync/bita"

var arc bytes.Buffer
_ = bita.Compress(input, &arc, bita.CompressConfig{})
a, _ := bita.OpenArchiveReaderAt(bytes.NewReader(arc.Bytes()))
_, _ = bita.Clone(a, out, bita.CloneOptions{Seeds: []io.Reader{seed}})