import { Buffer } from "./Buffer" ; function pathResolve ( ... pathes ) { return pathes . join ( "/" ) ; } export const path = { resolve : pathResolve , } ; export function assert ( bool , message ? ) { try { if ( ! bool ) { throw new Error ( ) ; } } catch ( e ) { throw new Error ( `AssertError: ${ message || e . stack [ 0 ] }` ) ; } } const MSB = 0x80 ; const REST = 0x7f ; const MSBALL = ~ REST ; const INT = Math . pow ( 2 , 31 ) ; const N1 = Math . pow ( 2 , 7 ) ; const N2 = Math . pow ( 2 , 14 ) ; const N3 = Math . pow ( 2 , 21 ) ; const N4 = Math . pow ( 2 , 28 ) ; const N5 = Math . pow ( 2 , 35 ) ; const N6 = Math . pow ( 2 , 42 ) ; const N7 = Math . pow ( 2 , 49 ) ; const N8 = Math . pow ( 2 , 56 ) ; const N9 = Math . pow ( 2 , 63 ) ; interface Encode { ( num , out ? , offset ? ) : number [ ] ; bytes : number ; } const encode = ( num , out ? , offset ? ) => { out = out || [ ] ; offset = offset || 0 ; const oldOffset = offset ; while ( num >= INT ) { out [ offset ++ ] = ( num & 0xff ) | MSB ; num /= 128 ; } while ( num & MSBALL ) { out [ offset ++ ] = ( num & 0xff ) | MSB ; num >>>= 7 ; } out [ offset ] = num | 0 ; encode . bytes = offset - oldOffset + 1 ; return out ; } ; encode . bytes = 0 ; function encodingLength ( value ) { return value < N1 ? 1 : value < N2 ? 2 : value < N3 ? 3 : value < N4 ? 4 : value < N5 ? 5 : value < N6 ? 6 : value < N7 ? 7 : value < N8 ? 8 : value < N9 ? 9 : 10 ; } interface Decode { ( buf , offset ? ) : number ; bytes : number ; } const decode = ( buf , offset ? ) => { let res = 0 ; const offset2 = offset || 0 ; let shift = 0 ; let counter = offset2 ; let b ; const l = buf . length ; do { if ( counter >= l ) { decode . bytes = 0 ; throw new RangeError ( "Could not decode varint" ) ; } b = buf [ counter ++ ] ; res += shift < 28 ? ( b & REST ) << shift : ( b & REST ) * Math . pow ( 2 , shift ) ; shift += 7 ; } while ( b >= MSB ) ; decode . bytes = counter - offset2 ; return res ; } ; decode . bytes = 0 ; export const varint = { decode , encode , encodingLength , } ;