import { ReadStream , WriteStream } from '.' ; interface FixedStream { /**
     * Returns true if operation has done and cannot be written / read more
     */ readonly done : boolean ; /**
     * Total size that can be write or read
     */ readonly size : number ; } /**
 * Fixed sized stream that can be used for reading.
 * Extra bytes are removed.
 */ export class FixedReadStream implements ReadStream , FixedStream { private _read : number ; constructor ( private _stream , private _size ) { this . _read = 0 ; } get size ( ) : number { return this . _size ; } /**
     * Read size
     */ get readSize ( ) : number { return this . _read ; } get done ( ) : boolean { return this . _read >= this . _size ; } async read ( buffer ) { if ( this . done ) return 0 ; let view = buffer ; if ( this . _read + view . byteLength > this . _size ) { view = buffer . subarray ( 0 , this . _size - this . _read ) ; } const read = await this . _stream . read ( view ) ; if ( read ) this . _read += read ; return read ; } get ended ( ) : boolean { return this . _stream . ended ; } close ( ) { this . _stream . close ( ) ; } } export class FixedWriteStream implements WriteStream , FixedStream { private _written : number ; constructor ( private _stream , private _size ) { this . _written = 0 ; } get size ( ) : number { return this . _size ; } get done ( ) : boolean { return this . _written >= this . _size ; } /**
     * Written size
     */ get written ( ) : number { return this . _written ; } async write ( data ) { if ( this . done ) return 0 ; let view = data ; if ( this . _written + view . byteLength > this . _size ) { view = data . subarray ( 0 , Math . max ( this . _size - this . _written , 0 ) ) ; } const written = await this . _stream . write ( view ) ; this . _written += written ; return written ; } get ended ( ) : boolean { return this . _stream . ended ; } close ( ) { this . _stream . close ( ) ; } }