# Struct ethcore::snapshot::io::PackedWriter [−] [src]

    pub struct PackedWriter { /* fields omitted */ }

A packed snapshot writer. This writes snapshots to a single concatenated file.

The file format is very simple and consists of three parts: [Concatenated chunk data] [manifest as RLP] [manifest start offset (8 bytes little-endian)]

The manifest contains all the same information as a standard `ManifestData`, but also maps chunk hashes to their lengths and offsets in the file for easy reading.

## Methods

### `impl PackedWriter`
[src]

#### `fn new(path: &Path) -> Result<Self>`

Create a new "PackedWriter", to write into the file at the given path.

## Trait Implementations

### `impl SnapshotWriter for PackedWriter`
[src]

#### `fn write_state_chunk(&mut self, hash: H256, chunk: &[u8]) -> Result<()>`

Write a compressed state chunk.

#### `fn write_block_chunk(&mut self, hash: H256, chunk: &[u8]) -> Result<()>`

Write a compressed block chunk.

#### `fn finish(self, manifest: ManifestData) -> Result<()>`

Complete writing. The manifest's chunk lists must be consistent with the chunks written. Read more

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)