Struct libipld::block::Block

pub struct Block<S> { /* private fields */ }

Block

Implementations

impl<S: StoreParams> Block<S>

pub fn new(cid: Cid, data: Vec<u8>) -> Result<Self>

Creates a new block. Returns an error if the hash doesn’t match the data.

pub fn new_unchecked(cid: Cid, data: Vec<u8>) -> Self

Creates a new block without verifying the cid.

pub fn cid(&self) -> &Cid

Returns the cid.

pub fn data(&self) -> &[u8]

Returns the payload.

pub fn into_inner(self) -> (Cid, Vec<u8>)

Returns the inner cid and data.

pub fn encode<CE, T: Encode<CE> + ?Sized>( codec: CE, hcode: S::Hashes, payload: &T, ) -> Result<Self>

where CE: Into<S::Codecs> + Codec,

Encode a block.`

pub fn decode<CD: Codec, T: Decode<CD>>(&self) -> Result<T>

where S::Codecs: Into<CD>,

Decodes a block.

Example

Decoding to Ipld:

use libipld::block::Block;
use libipld::cbor::DagCborCodec;
use libipld::ipld::Ipld;
use libipld::multihash::Code;
use libipld::store::DefaultParams;

let block =
    Block::<DefaultParams>::encode(DagCborCodec, Code::Blake3_256, "Hello World!").unwrap();
let ipld = block.decode::<DagCborCodec, Ipld>().unwrap();

assert_eq!(ipld, Ipld::String("Hello World!".to_string()));

pub fn ipld(&self) -> Result<Ipld>

where Ipld: Decode<S::Codecs>,

Returns the decoded ipld.

pub fn references<E: Extend<Cid>>(&self, set: &mut E) -> Result<()>

where Ipld: References<S::Codecs>,

Returns the references.

Methods from Deref<Target = Cid>

pub fn version(&self) -> Version

Returns the cid version.

pub fn codec(&self) -> u64

Returns the cid codec.

pub fn hash(&self) -> &Multihash<S>

Returns the cid multihash.

pub fn write_bytes<W>(&self, w: W) -> Result<usize, Error>

where W: Write,

Writes the bytes to a byte stream, returns the number of bytes written.

pub fn encoded_len(&self) -> usize

Returns the length in bytes needed to encode this cid into bytes.

pub fn to_bytes(&self) -> Vec<u8>

Returns the encoded bytes of the Cid.

pub fn to_string_of_base(&self, base: Base) -> Result<String, Error>

Convert CID into a multibase encoded string

Example

use cid::Cid;
use multibase::Base;
use multihash::{Code, MultihashDigest};

const RAW: u64 = 0x55;

let cid = Cid::new_v1(RAW, Code::Sha2_256.digest(b"foo"));
let encoded = cid.to_string_of_base(Base::Base64).unwrap();
assert_eq!(encoded, "mAVUSICwmtGto/8aP+ZtFPB0wQTQTQi1wZIO/oPmKXohiZueu");

Trait Implementations

impl<S> AsRef<[u8]> for Block<S>

fn as_ref(&self) -> &[u8]

Converts this type into a shared reference of the (usually inferred) input type.

impl<S> AsRef<Cid<64>> for Block<S>

fn as_ref(&self) -> &Cid

Converts this type into a shared reference of the (usually inferred) input type.

impl<S> Borrow<Cid<64>> for Block<S>

fn borrow(&self) -> &Cid

Immutably borrows from an owned value.

impl<S: Clone> Clone for Block<S>

fn clone(&self) -> Block<S>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<S> Debug for Block<S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<S> Deref for Block<S>

type Target = Cid<64>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<S> Hash for Block<S>

fn hash<SH: Hasher>(&self, hasher: &mut SH)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<S> PartialEq for Block<S>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<S> Eq for Block<S>