nd-com-int

nd-com-int

• simple wrap of https://github.com/lemire/streamvbyte
• nv-lang USE https://github.com/lemire/streamvbyte FOR a i-ast compress

install

• npm install nd-com-int

usage

  const {_encd,_decd,encd,decd}   = require("nd-com-int");

example

            var arr = Array.from({length:1000000}).map((r,i)=>i);
            var u32a = new Uint32Array(arr);

            > u32a.buffer.byteLength
            4000000
            > 

            var encded = encd(arr);
            /*
            > encded
            {
              cnt: 1000000,
              ab: ArrayBuffer {
                [Uint8Contents]: <00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 ... 3184108 more bytes>,
                byteLength: 3184208
              }
            }
            > 
            */
            > encded.ab.byteLength / u32a.buffer.byteLength
            0.796052
            > 


            > var decded = decd(encded)
            > decded
            Uint32Array(1000000) [
               0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,
              12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
              24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
              36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
              48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
              60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
              72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
              84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
              96, 97, 98, 99,
              ... 999900 more items
            ]

METHODS

APIS

                    export interface Encoded {
                        cnt: number;                  //size_t  int-count
                        ei?: number;                  //size_t  used IN encd(o,minimize_if_not_support_resize=true)  only WHEN ArrayBuffer.prototype.resize NOT-EXIST and minimize_if_not_support_resize = false
                        ab: ArrayBuffer;
                    }

                    type Ablike =  ArrayBuffer | Array<number> | TypedArray;        // number must be ui32


                    export function _encd(cnt:number,ab:ArrayBuffer): [number,number,ArrayBuffer];         // [cnt,encoded-byte-size,to-be-encoded-array-buffer]
                    export function _decd(cnt:number,ab:ArrayBuffer): [number,number,ArrayBuffer];         // [cnt,decoded-byte-size,decoded-array-buffer]

                    export function encd(o:Ablike,minimize_if_not_support_resize:Boolean=true):Encoded;
                    export function decd(encded:Encoded): Uint32Array;

LICENSE

• ISC