buffer-test.js
8.13 KB
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var assert = require('assert');
var OffsetBuffer = require('../');
describe('OffsetBuffer', function() {
var o;
beforeEach(function() {
o = new OffsetBuffer();
});
describe('.take()', function() {
it('should return empty buffer', function() {
var b = new Buffer('hello world');
o.push(b);
var r = o.take(0);
assert.equal(r.length, 0);
assert.equal(o.size, b.length);
});
it('should return the first buffer itself', function() {
var b = new Buffer('hello world');
o.push(b);
var r = o.take(b.length);
assert(r === b);
assert(o.isEmpty());
});
it('should return the slice of the buffer ', function() {
var b = new Buffer('hello world');
o.push(b);
assert.equal(o.take(5).toString(), 'hello');
assert.equal(o.take(1).toString(), ' ');
assert.equal(o.take(5).toString(), 'world');
assert(o.isEmpty());
});
it('should concat buffers', function() {
o.push(new Buffer('hello'));
o.push(new Buffer(' '));
o.push(new Buffer('world!'));
assert.equal(o.take(11).toString(), 'hello world');
assert.equal(o.take(1).toString(), '!');
assert(o.isEmpty());
});
});
describe('.skip', function() {
it('should skip bytes', function() {
o.push(new Buffer('hello '));
o.push(new Buffer('world'));
o.push(new Buffer(' oh gosh'));
assert.equal(o.take(2).toString(), 'he');
o.skip(1);
assert.equal(o.take(2).toString(), 'lo');
o.skip(1);
assert.equal(o.take(2).toString(), 'wo');
o.skip(4);
assert.equal(o.take(7).toString(), 'oh gosh');
assert(o.isEmpty());
});
});
describe('.peekUInt8', function() {
it('should return and not move by one byte', function() {
o.push(new Buffer([ 0x1, 0x2 ]));
assert.equal(o.peekUInt8(), 1);
assert.equal(o.readUInt8(), 1);
assert.equal(o.peekUInt8(), 2);
assert.equal(o.readUInt8(), 2);
assert(o.isEmpty());
});
});
describe('.peekInt8', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0x80 ]));
assert.equal(o.peekInt8(), -128);
assert.equal(o.readInt8(), -128);
assert(o.isEmpty());
});
});
describe('.readUInt8', function() {
it('should return and move by one byte', function() {
o.push(new Buffer([ 0x1, 0x2 ]));
o.push(new Buffer([ 0x3, 0x4 ]));
assert.equal(o.readUInt8(), 1);
assert.equal(o.readUInt8(), 2);
assert.equal(o.readUInt8(), 3);
assert.equal(o.readUInt8(), 4);
assert(o.isEmpty());
});
});
describe('.readInt8', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0x8f, 0x7f ]));
assert.equal(o.readInt8(), -113);
assert.equal(o.readInt8(), 127);
assert(o.isEmpty());
});
});
describe('.readUInt16LE', function() {
it('should return and move by two bytes', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3 ]));
o.push(new Buffer([ 0x4, 0x5, 0x6 ]));
assert.equal(o.readUInt16LE(), 0x0201);
assert.equal(o.readUInt16LE(), 0x0403);
assert.equal(o.readUInt16LE(), 0x0605);
assert(o.isEmpty());
});
it('should return and move by two bytes (regression #1)', function() {
o.push(new Buffer([ 0x1 ]));
o.push(new Buffer([ 0x2, 0x3, 0x4 ]));
assert.equal(o.readUInt16LE(), 0x0201);
assert.equal(o.readUInt16LE(), 0x0403);
assert(o.isEmpty());
});
});
describe('.readInt16LE', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0x23, 0x81 ]));
assert.equal(o.readInt16LE(), -32477);
assert(o.isEmpty());
});
});
describe('.readUInt24LE', function() {
it('should return and move by three bytes', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3, 0x4, 0x5 ]));
o.push(new Buffer([ 0x6, 0x7 ]));
o.push(new Buffer([ 0x8, 0x9 ]));
assert.equal(o.readUInt24LE(), 0x030201);
assert.equal(o.readUInt24LE(), 0x060504);
assert.equal(o.readUInt24LE(), 0x090807);
assert(o.isEmpty());
});
it('should return and move by three bytes (regression #1)', function() {
o.push(new Buffer([ 0x1, 0x2 ]));
o.push(new Buffer([ 0x3 ]));
assert.equal(o.readUInt24LE(), 0x030201);
assert.equal(o.buffers.length, 0);
assert(o.isEmpty());
});
});
describe('.readInt24LE', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0x23, 0x45, 0x81 ]));
assert.equal(o.readInt24LE(), -8305373);
assert(o.isEmpty());
});
});
describe('.readUInt32LE', function() {
it('should return and move by four bytes', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 ]));
o.push(new Buffer([ 0x8, 0x9, 0xa ]));
o.push(new Buffer([ 0xb, 0xc, 0xd ]));
o.push(new Buffer([ 0xe, 0xf, 0x10 ]));
assert.equal(o.readUInt32LE(), 0x04030201);
assert.equal(o.readUInt32LE(), 0x08070605);
assert.equal(o.readUInt32LE(), 0x0c0b0a09);
assert.equal(o.readUInt32LE(), 0x100f0e0d);
assert(o.isEmpty());
});
it('should return and move by four bytes (regression #1)', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3 ]));
o.push(new Buffer([ 0x4 ]));
assert.equal(o.readUInt32LE(), 0x04030201);
assert.equal(o.buffers.length, 0);
assert(o.isEmpty());
});
});
describe('.readInt32LE', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0xff, 0xff, 0xff, 0xff ]));
assert.equal(o.readInt32LE(), -1);
assert(o.isEmpty());
});
});
describe('.readUInt16BE', function() {
it('should return and move by two bytes', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3 ]));
o.push(new Buffer([ 0x4, 0x5, 0x6 ]));
assert.equal(o.readUInt16BE(), 0x0102);
assert.equal(o.readUInt16BE(), 0x0304);
assert.equal(o.readUInt16BE(), 0x0506);
assert(o.isEmpty());
});
});
describe('.readInt16BE', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0x81, 0x23 ]));
assert.equal(o.readInt16BE(), -32477);
assert(o.isEmpty());
});
});
describe('.readUInt24BE', function() {
it('should return and move by three bytes', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3, 0x4, 0x5 ]));
o.push(new Buffer([ 0x6, 0x7 ]));
o.push(new Buffer([ 0x8, 0x9 ]));
assert.equal(o.readUInt24BE(), 0x010203);
assert.equal(o.readUInt24BE(), 0x040506);
assert.equal(o.readUInt24BE(), 0x070809);
assert(o.isEmpty());
});
});
describe('.readInt24BE', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0x81, 0x45, 0x23 ]));
assert.equal(o.readInt24BE(), -8305373);
assert(o.isEmpty());
});
});
describe('.readUInt32BE', function() {
it('should return and move by four bytes', function() {
o.push(new Buffer([ 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 ]));
o.push(new Buffer([ 0x8, 0x9, 0xa ]));
o.push(new Buffer([ 0xb, 0xc, 0xd ]));
o.push(new Buffer([ 0xe, 0xf, 0x10 ]));
assert.equal(o.readUInt32BE(), 0x01020304);
assert.equal(o.readUInt32BE(), 0x05060708);
assert.equal(o.readUInt32BE(), 0x090a0b0c);
assert.equal(o.readUInt32BE(), 0x0d0e0f10);
assert(o.isEmpty());
});
it('should return positive values', function() {
o.push(new Buffer([ 0xff, 0xff, 0xff, 0xff ]));
assert.equal(o.readUInt32BE(), 0xffffffff);
assert(o.isEmpty());
});
});
describe('.readInt32BE', function() {
it('should return signed number', function() {
o.push(new Buffer([ 0xff, 0xff, 0xff, 0xff ]));
assert.equal(o.readInt32BE(), -1);
assert(o.isEmpty());
});
});
describe('.has', function() {
it('should properly check the amount of the remaining bytes', function() {
o.push(new Buffer([ 1, 2, 3 ]));
assert(o.has(3));
assert.equal(o.readUInt8(), 0x01);
assert(!o.has(3));
assert(o.has(2));
assert.equal(o.readUInt16BE(), 0x0203);
assert(!o.has(1));
});
});
});