275 lines
7.5 KiB
JavaScript
275 lines
7.5 KiB
JavaScript
var BufferWriter = require('../lib/bufferwriter');
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var BufferReader = require('../lib/bufferreader');
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var should = require('chai').should();
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var BN = require('../lib/bn');
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describe('BufferReader', function() {
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it('should make a new BufferReader', function() {
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var br = new BufferReader();
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should.exist(br);
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br = BufferReader();
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should.exist(br);
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});
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it('should create a new bufferreader with a buffer', function() {
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var buf = new Buffer(0);
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var br = new BufferReader(buf);
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should.exist(br);
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Buffer.isBuffer(br.buf).should.equal(true);
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});
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describe('#set', function() {
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it('should set pos', function() {
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should.exist(BufferReader().set({pos: 1}).pos);
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});
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});
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describe('#eof', function() {
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it('should return true for a blank br', function() {
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var br = new BufferReader({buf: new Buffer([])});
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br.eof().should.equal(true);
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});
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});
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describe('read', function() {
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it('should return the same buffer', function() {
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var buf = new Buffer([0]);
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var br = new BufferReader({buf: buf});
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br.read().toString('hex').should.equal(buf.toString('hex'));
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});
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it('should return a buffer of this length', function() {
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var buf = new Buffer(10);
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buf.fill(0);
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var br = new BufferReader(buf);
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var buf2 = br.read(2);
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buf2.length.should.equal(2);
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br.eof().should.equal(false);
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br.pos.should.equal(2);
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});
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});
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describe('#readUInt8', function() {
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it('should return 1', function() {
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var buf = new Buffer(1);
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buf.writeUInt8(1, 0);
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var br = new BufferReader({buf: buf});
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br.readUInt8().should.equal(1);
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});
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});
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describe('#readUInt16BE', function() {
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it('should return 1', function() {
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var buf = new Buffer(2);
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buf.writeUInt16BE(1, 0);
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var br = new BufferReader({buf: buf});
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br.readUInt16BE().should.equal(1);
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});
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});
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describe('#readUInt16LE', function() {
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it('should return 1', function() {
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var buf = new Buffer(2);
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buf.writeUInt16LE(1, 0);
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var br = new BufferReader({buf: buf});
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br.readUInt16LE().should.equal(1);
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});
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});
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describe('#readUInt32BE', function() {
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it('should return 1', function() {
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var buf = new Buffer(4);
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buf.writeUInt32BE(1, 0);
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var br = new BufferReader({buf: buf});
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br.readUInt32BE().should.equal(1);
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});
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});
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describe('#readUInt32LE', function() {
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it('should return 1', function() {
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var buf = new Buffer(4);
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buf.writeUInt32LE(1, 0);
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var br = new BufferReader({buf: buf});
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br.readUInt32LE().should.equal(1);
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});
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});
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describe('#readUInt64BEBN', function() {
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it('should return 1', function() {
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var buf = new Buffer(8);
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buf.fill(0);
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buf.writeUInt32BE(1, 4);
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var br = new BufferReader({buf: buf});
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br.readUInt64BEBN().toNumber().should.equal(1);
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});
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it('should return 2^64', function() {
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var buf = new Buffer(8);
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buf.fill(0xff);
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var br = new BufferReader({buf: buf});
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br.readUInt64BEBN().toNumber().should.equal(Math.pow(2, 64));
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});
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});
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describe('#readUInt64LEBN', function() {
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it('should return 1', function() {
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var buf = new Buffer(8);
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buf.fill(0);
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buf.writeUInt32LE(1, 0);
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var br = new BufferReader({buf: buf});
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br.readUInt64LEBN().toNumber().should.equal(1);
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});
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it('should return 2^30', function() {
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var buf = new Buffer(8);
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buf.fill(0);
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buf.writeUInt32LE(Math.pow(2, 30), 0);
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var br = new BufferReader({buf: buf});
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br.readUInt64LEBN().toNumber().should.equal(Math.pow(2, 30));
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});
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it('should return 0', function() {
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var buf = new Buffer(8);
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buf.fill(0);
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var br = new BufferReader({buf: buf});
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br.readUInt64LEBN().toNumber().should.equal(0);
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});
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it('should return 2^64', function() {
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var buf = new Buffer(8);
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buf.fill(0xff);
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var br = new BufferReader({buf: buf});
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br.readUInt64LEBN().toNumber().should.equal(Math.pow(2, 64));
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});
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});
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describe('#readVarintBuf', function() {
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it('should read a 1 byte varint', function() {
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var buf = new Buffer([50]);
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var br = new BufferReader({buf: buf});
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br.readVarintBuf().length.should.equal(1);
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});
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it('should read a 3 byte varint', function() {
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var buf = new Buffer([253, 253, 0]);
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var br = new BufferReader({buf: buf});
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br.readVarintBuf().length.should.equal(3);
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});
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it('should read a 5 byte varint', function() {
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var buf = new Buffer([254, 0, 0, 0, 0]);
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buf.writeUInt32LE(50000, 1);
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var br = new BufferReader({buf: buf});
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br.readVarintBuf().length.should.equal(5);
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});
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it('should read a 9 byte varint', function() {
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var buf = BufferWriter().writeVarintBN(BN(Math.pow(2, 54).toString())).concat();
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var br = new BufferReader({buf: buf});
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br.readVarintBuf().length.should.equal(9);
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});
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});
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describe('#readVarintNum', function() {
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it('should read a 1 byte varint', function() {
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var buf = new Buffer([50]);
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var br = new BufferReader({buf: buf});
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br.readVarintNum().should.equal(50);
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});
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it('should read a 3 byte varint', function() {
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var buf = new Buffer([253, 253, 0]);
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var br = new BufferReader({buf: buf});
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br.readVarintNum().should.equal(253);
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});
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it('should read a 5 byte varint', function() {
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var buf = new Buffer([254, 0, 0, 0, 0]);
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buf.writeUInt32LE(50000, 1);
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var br = new BufferReader({buf: buf});
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br.readVarintNum().should.equal(50000);
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});
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it('should throw an error on a 9 byte varint over the javascript uint precision limit', function() {
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var buf = BufferWriter().writeVarintBN(BN(Math.pow(2, 54).toString())).concat();
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var br = new BufferReader({buf: buf});
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(function() {
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br.readVarintNum();
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}).should.throw('number too large to retain precision - use readVarintBN');
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});
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it('should not throw an error on a 9 byte varint not over the javascript uint precision limit', function() {
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var buf = BufferWriter().writeVarintBN(BN(Math.pow(2, 53).toString())).concat();
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var br = new BufferReader({buf: buf});
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(function() {
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br.readVarintNum();
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}).should.not.throw('number too large to retain precision - use readVarintBN');
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});
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});
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describe('#readVarintBN', function() {
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it('should read a 1 byte varint', function() {
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var buf = new Buffer([50]);
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var br = new BufferReader({buf: buf});
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br.readVarintBN().toNumber().should.equal(50);
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});
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it('should read a 3 byte varint', function() {
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var buf = new Buffer([253, 253, 0]);
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var br = new BufferReader({buf: buf});
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br.readVarintBN().toNumber().should.equal(253);
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});
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it('should read a 5 byte varint', function() {
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var buf = new Buffer([254, 0, 0, 0, 0]);
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buf.writeUInt32LE(50000, 1);
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var br = new BufferReader({buf: buf});
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br.readVarintBN().toNumber().should.equal(50000);
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});
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it('should read a 9 byte varint', function() {
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var buf = Buffer.concat([new Buffer([255]), new Buffer('ffffffffffffffff', 'hex')]);
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var br = new BufferReader({buf: buf});
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br.readVarintBN().toNumber().should.equal(Math.pow(2, 64));
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});
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});
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describe('#reverse', function() {
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it('should reverse this [0, 1]', function() {
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var buf = new Buffer([0, 1]);
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var br = new BufferReader({buf: buf});
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br.reverse().read().toString('hex').should.equal('0100');
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});
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});
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});
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