import { BaseHashInput , inputToArray , IBaseHashOptions , defaultHashLength } from './hash-fn' ; import { IHashReader } from './hash-reader' ; /**
 * A blake3 hash. Quite similar to Node's crypto hashing.
 *
 * Note that you must call  IHash or  IHash when
 * you're finished with it to free memory.
  export interface IHasher < T > { throws {Error} if  IHash has already been called.
      update ( data ) : this ; /**
     * Returns a digest of the hash.
     *
     * If `dispose: false` is given in the options, the hash will not
     * automatically be disposed of, allowing you to continue updating
     * it after obtaining the current reader.
     */ digest ( options ? ) : T ; /**
     * Returns a  HashReader for the current hash.
     *
     * If `dispose: false` is given in the options, the hash will not
     * automatically be disposed of, allowing you to continue updating
     * it after obtaining the current reader.
      reader ( options ? ) : IHashReader < T > ; /**
     * Frees data associated with the hash. This *must* be called if
     *  IHash is not called in order to free memory.
      dispose ( ) : void ; } hidden export interface IInternalHash < Reader > { free ( ) : void ; reader ( ) : Reader ; update ( bytes ) : void ; digest ( into ) : void ; } export interface IHasherDigestOptions extends IBaseHashOptions { dispose ? : boolean ; } /**
 * Base implementation of hashing.
 */ export class BaseHash < Binary extends Uint8Array , InternalReader , Reader extends IHashReader < Binary > > implements IHasher < Binary > { private hash : IInternalHash < InternalReader > | undefined ; constructor ( implementation , private readonly alloc , private readonly getReader ) { this . hash = implementation ; } inheritdoc public update ( data ) { if ( ! this . hash ) { throw new Error ( 'Cannot continue updating hashing after dispose() has been called' ) ; } this . hash . update ( inputToArray ( data ) ) ; return this ; } inheritdoc public digest ( { length = defaultHashLength , dispose = true } = { } ) { if ( ! this . hash ) { throw new Error ( 'Cannot call digest() after dipose() has been called' ) ; } const digested = this . alloc ( length ) ; this . hash . digest ( digested ) ; if ( dispose ) { this . dispose ( ) ; } return digested ; } inheritdoc public reader ( { dispose = true } = { } ) { if ( ! this . hash ) { throw new Error ( 'Cannot call reader() after dipose() has been called' ) ; } const reader = this . getReader ( this . hash . reader ( ) ) ; if ( dispose ) { this . dispose ( ) ; } return reader ; } inheritdoc dispose ( ) { this . hash ?. free ( ) ; this . hash = undefined ; } }