bigbit / bigbitjs

Node js implementation of BigBit standard with online convertion and comparision tool

BigBit

An improved data type to save large numbers in less space without precision loss. check more detail here. Or try the demo

var HBSequence = require('bigbit').HeaderByte;

let hb = new HBSequence('167770021700.00');
expect( hb.toString() ).toEqual('167770021700');
expect( hb.toByteArray() ).toEqual([69, 2, 121, 172, 255, 99]);
expect( HBSequence.decode( hb.toByteArray() ).toString() ).toEqual('167770021700'); //decode( byteArray, index[, maxNumberOfBytes ]);
expect( hb.exponent ).toEqual( 2 );
expect( hb.exponentInBytes ).toEqual( 2 );
expect( hb.headByte ).toEqual(69);

var EHBSequence = require('bigbit').ExtendedHeaderByte;

let ehb = new EHBSequence('167770021700.00');
expect( ehb.toString() ).toEqual('167770021700');
expect( ehb.toByteArray() ).toEqual([69, 2, 121, 172, 255, 99]);
expect( EHBSequence.decode( hb.toByteArray() ).toString() ).toEqual('167770021700.00'); //decode( byteArray, index[, maxNumberOfBytes ]);
expect( ehb.exponent ).toEqual( 2 );
expect( ehb.exponentInBytes ).toEqual( [2] );
expect( ehb.headByte ).toEqual(69);

var LBSequence = require('bigbit').LinkedBytes;
expect( LBSequence.encode('123000')  ).toEqual( [ 248, 192, 7]);
expect( LBSequence.decode([ 248, 192, 7])  ).toEqual({ val: '123000', len: 3});  //decode( byteArray, index[, maxNumberOfBytes ]);

bigbitjs's Issues

Arithmetic operations not implemented in terms of BigBit formats themselves

Currently, the only way to perform arithmetic operations on BigBit numbers to convert them to BigNumbers, add these and encode them back to the original BigBit format. As the reference implementation, this strongly needs an implementation of BigBit arithmetics without BigNumbers, since such a type is not even present in certain languages, namely Rust, which I'm porting this format to (I'm trying to keep the crate as a zero-dependency self-sustaining implementation, thus using any other format as a helper construct simply hurts the proof of concept).