Struct ContentDigest 

pub struct ContentDigest {
    pub length: u64,
    pub fnv1a64: u64,
}

What: The length and hash of one file’s bytes. Why: A truncated file differs in length and a file with unwritten or foreign bytes differs in hash.

In TS you’d write (pseudocode):

type ContentDigest = { length: number; fnv1a64: bigint };

Fields

length: u64

Number of bytes.

fnv1a64: u64

FNV-1a 64-bit hash of the bytes.

Implementations

impl ContentDigest

pub fn hash_text(&self) -> String

What: The hash as the 16 lowercase hexadecimal digits a record stores. Why: JSON numbers cannot carry 64 bits exactly.

In TS you’d write (pseudocode):

digest.fnv1a64.toString(16).padStart(16, '0')

pub fn from_record(length: u64, hash_text: &str) -> Option<ContentDigest>

What: The digest a record’s length and hexadecimal hash text describe, or nothing when the text is not exactly 16 lowercase hexadecimal digits. Why: A record that spells the hash any other way is damaged, and the caller reports it as a malformed record.

In TS you’d write (pseudocode):

/^[0-9a-f]{16}$/.test(text) ? { length, fnv1a64: BigInt(`0x${text}`) } : undefined

Trait Implementations

impl Clone for ContentDigest

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ContentDigest

impl Debug for ContentDigest

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

Formats the value using the given formatter.

impl Eq for ContentDigest

impl PartialEq for ContentDigest

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ContentDigest