hdiff-update-core 0.1.1

Core library for signed HDiffPatch-based differential application updates.
Documentation 
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# hdiff-update-core

Core Rust library for signed HDiffPatch-based application updates.

The crate provides:

- SHA-256 file hashing and verification
- signed JSON update manifests
- Ed25519 release key generation, signing, and verification
- HTTP artifact download helpers
- HDiffPatch `hdiffz` / `hpatchz` process invocation
- update preparation with delta selection and full fallback

This crate does not embed HDiffPatch binaries. Production applications should
package or resolve `hpatchz` explicitly.

## Example

```rust
use hdiff_update_core::{prepare_update, PrepareUpdateOptions};

# async fn run() -> Result<(), Box<dyn std::error::Error>> {
let prepared = prepare_update(
    PrepareUpdateOptions {
        manifest_url: "https://updates.example.com/latest.json".to_string(),
        platform: None,
        current_version: Some("0.1.0".to_string()),
        current_artifact_path: None,
        output_path: None,
        patch_path: None,
        cache_dir: None,
        hpatchz_path: None,
        signature_public_key: Some("base64-ed25519-public-key".to_string()),
        require_signature: true,
        force: true,
        headers: Vec::new(),
        timeout_secs: Some(60),
    },
    |_event| {},
)
.await?;

println!("prepared installer: {}", prepared.artifact_path.display());
# Ok(())
# }
```