wbuf-test.js
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var assert = require('assert');
var WriteBuffer = require('../');
describe('WriteBuffer', function() {
var w;
beforeEach(function() {
w = new WriteBuffer();
});
function join(arr) {
return arr.map(function(buf) {
return buf.toString('hex');
}).join('');
}
describe('.writeUInt8', function() {
it('should write bytes', function() {
w.writeUInt8(1);
w.writeUInt8(2);
w.writeUInt8(3);
w.writeUInt8(4);
assert.equal(join(w.render()), '01020304');
});
it('should correctly handle overflow', function() {
w.reserve(3);
w.writeUInt8(1);
w.writeUInt8(2);
w.writeUInt8(3);
w.writeUInt8(4);
assert.equal(join(w.render()), '01020304');
});
});
describe('.writeInt8', function() {
it('should write bytes', function() {
w.writeInt8(-1);
w.writeInt8(2);
assert.equal(join(w.render()), 'ff02');
});
});
describe('.writeUInt16BE', function() {
it('should write bytes', function() {
w.writeUInt16BE(0x0102);
w.writeUInt16BE(0x0304);
assert.equal(join(w.render()), '01020304');
});
it('should correctly handle overflow', function() {
w.reserve(2);
w.reserve(3);
w.writeUInt16BE(0x0102);
w.writeUInt16BE(0x0304);
w.writeUInt16BE(0x0506);
assert.equal(join(w.render()), '010203040506');
});
});
describe('.writeInt16BE', function() {
it('should write bytes', function() {
w.writeInt16BE(-0x0102);
w.writeInt16BE(0x0304);
assert.equal(join(w.render()), 'fefe0304');
});
});
describe('.writeUInt16LE', function() {
it('should write bytes', function() {
w.writeUInt16LE(0x0102);
w.writeUInt16LE(0x0304);
assert.equal(join(w.render()), '02010403');
});
it('should correctly handle overflow', function() {
w.reserve(2);
w.reserve(3);
w.writeUInt16LE(0x0102);
w.writeUInt16LE(0x0304);
w.writeUInt16LE(0x0506);
assert.equal(join(w.render()), '020104030605');
});
});
describe('.writeInt16LE', function() {
it('should write bytes', function() {
w.writeInt16LE(-0x0201);
w.writeInt16LE(0x0304);
assert.equal(join(w.render()), 'fffd0403');
});
});
describe('.writeUInt24BE', function() {
it('should write bytes', function() {
w.writeUInt24BE(0x010203);
w.writeUInt24BE(0x040506);
assert.equal(join(w.render()), '010203040506');
});
it('should correctly set avail on boundary', function() {
w = new WriteBuffer();
w.reserveRate = 4;
w.writeUInt16BE(1);
w.writeUInt24BE(1);
assert.equal(w.avail, 3);
});
});
describe('.writeInt24BE', function() {
it('should write bytes', function() {
w.writeInt24BE(-0x010203);
w.writeInt24BE(0x040506);
assert.equal(join(w.render()), 'fefdfd040506');
});
});
describe('.writeUInt24LE', function() {
it('should write bytes', function() {
w.writeUInt24LE(0x010203);
w.writeUInt24LE(0x040506);
assert.equal(join(w.render()), '030201060504');
});
});
describe('.writeInt24LE', function() {
it('should write bytes', function() {
w.writeInt24LE(-0x010203);
w.writeInt24LE(0x040506);
assert.equal(join(w.render()), 'fdfdfe060504');
});
});
describe('.writeUInt32BE', function() {
it('should write bytes', function() {
w.writeUInt32BE(0x01020304);
w.writeUInt32BE(0x05060708);
assert.equal(join(w.render()), '0102030405060708');
});
it('should write bytes on the boundary', function() {
w.reserve(4);
w.writeUInt8(0x00);
w.writeUInt32BE(0x01020304);
assert.equal(join(w.render()), '0001020304');
});
});
describe('.writeInt32BE', function() {
it('should write bytes', function() {
w.writeInt32BE(-0x01020304);
w.writeInt32BE(0x05060708);
assert.equal(join(w.render()), 'fefdfcfc05060708');
});
});
describe('.writeUInt32LE', function() {
it('should write bytes', function() {
w.writeUInt32LE(0x01020304);
w.writeUInt32LE(0x05060708);
assert.equal(join(w.render()), '0403020108070605');
});
it('should write max uint32 value', function() {
w.writeUInt32LE(0xffffffff);
assert.equal(join(w.render()), 'ffffffff');
});
});
describe('.combWrite', function() {
it('should write bytes', function() {
w.writeComb(1, 'le', 0x01);
w.writeComb(1, 'be', 0x02);
w.writeComb(2, 'le', 0x0102);
w.writeComb(2, 'be', 0x0304);
w.writeComb(3, 'le', 0x010203);
w.writeComb(3, 'be', 0x040506);
w.writeComb(4, 'le', 0x01020304);
w.writeComb(4, 'be', 0x05060708);
assert.equal(join(w.render()),
'0102020103040302010405060403020105060708');
});
it('should write max uint32 value', function() {
w.writeUInt32LE(0xffffffff);
assert.equal(join(w.render()), 'ffffffff');
});
});
describe('.writeInt32LE', function() {
it('should write bytes', function() {
w.writeInt32LE(-0x01020304);
w.writeInt32LE(0x05060708);
assert.equal(join(w.render()), 'fcfcfdfe08070605');
});
});
describe('.skip', function() {
it('should skip bytes', function() {
w.skip(4);
w.writeUInt32BE(0xdeadbeef);
assert(/^.{8}deadbeef$/.test(join(w.render())));
});
it('should skip 0 bytes', function() {
var skip = w.skip(0);
assert.equal(skip.size, 0);
w.writeUInt32BE(0xdeadbeef);
assert(/^deadbeef$/.test(join(w.render())));
});
it('should skip bytes on the boundary', function() {
w.reserve(4);
w.writeUInt8(0x01);
var skip = w.skip(4);
w.writeUInt32BE(0xdeadbeef);
skip.writeUInt32BE(0xabbabaab);
assert(/^01abbabaabdeadbeef$/.test(join(w.render())));
});
it('should skip bytes on the boundary in two chunks', function() {
w.reserve(4);
var skip1 = w.skip(2);
var skip2 = w.skip(2);
w.writeUInt32BE(0xdeadbeef);
skip1.writeUInt16BE(0xabba);
skip2.writeUInt16BE(0xbaba);
assert(/^abbababadeadbeef$/.test(join(w.render())));
});
});
describe('.slice', function() {
it('should return empty slice', function() {
w.writeUInt32BE(0xabbadead);
assert.equal(join(w.slice(4, 4).render()), '');
assert.equal(join(w.render()), 'abbadead');
});
it('should return full slice', function() {
w.writeUInt32BE(0xabbadead);
var slice = w.slice(0, 4);
slice.writeUInt32BE(0xdeadbeef);
assert.equal(join(slice.render()), 'deadbeef');
assert.equal(join(w.render()), 'deadbeef');
});
it('should return partial slice', function() {
w.writeUInt32BE(0xabbadead);
var slice = w.slice(0, 3);
slice.writeUInt24BE(0xdeadbe);
assert.equal(join(slice.render()), 'deadbe');
assert.equal(join(w.render()), 'deadbead');
});
it('should return over-the-boundary slice', function() {
for (var i = 0; i < 16; i++) {
w.reserve(3);
w.writeUInt24BE(i);
}
assert.equal(join(w.render()),
'000000000001000002000003000004000005000006000007' +
'00000800000900000a00000b00000c00000d00000e00000f');
var slice = w.slice(5, 12);
slice.writeUInt24BE(0xaaabac);
slice.writeUInt24BE(0xbabbbc);
slice.writeUInt8(0xcc);
assert.equal(join(slice.render()), 'aaabacbabbbccc');
assert.equal(join(w.render()),
'0000000000aaabacbabbbccc000004000005000006000007' +
'00000800000900000a00000b00000c00000d00000e00000f');
});
});
describe('.copyFrom', function() {
it('should copy bytes', function() {
var tmp = new Buffer(128);
for (var i = 0; i < tmp.length; i++)
tmp[i] = i;
w.writeUInt32BE(0xdeadbeef);
w.copyFrom(tmp);
w.writeUInt32BE(0xabbadead);
assert.equal(
join(w.render()),
'deadbeef000102030405060708090a0b0c0d0e0f101112131415161718191a1b' +
'1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b' +
'3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b' +
'5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b' +
'7c7d7e7fabbadead');
});
it('should copy bytes using offset', function() {
var tmp = new Buffer(128);
for (var i = 0; i < tmp.length; i++)
tmp[i] = i;
w.writeUInt32BE(0xdeadbeef);
w.copyFrom(tmp, 10, 12);
w.writeUInt32BE(0xabbadead);
assert.equal(
join(w.render()),
'deadbeef0a0babbadead');
});
});
describe('.write', function() {
it('should write utf8 string', function() {
w.writeUInt32BE(0xdeadbeef);
w.write('ohai\u1023');
w.writeUInt32BE(0xabbadead);
assert.equal(
join(w.render()),
'deadbeef' +
'6f6861691023' +
'abbadead');
});
it('should copy bytes using offset', function() {
var tmp = new Buffer(128);
for (var i = 0; i < tmp.length; i++)
tmp[i] = i;
w.writeUInt32BE(0xdeadbeef);
w.copyFrom(tmp, 10, 12);
w.writeUInt32BE(0xabbadead);
assert.equal(
join(w.render()),
'deadbeef0a0babbadead');
});
});
describe('.skip', function() {
it('should copy bytes', function() {
w.reserve(5);
var h = w.skip(4);
w.writeUInt32BE(0xabbadead);
h.writeUInt32BE(0xdeadbeef);
assert.equal(
join(w.render()),
'deadbeefabbadead');
});
});
describe('.forceReserve = true', function() {
it('should allocate more bytes', function() {
w.forceReserve = true;
w.reserve(4);
w.writeUInt32BE(0xabbadead);
w.writeUInt32BE(0xabbadead);
assert.equal(w.render().length, 1);
});
});
});