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const {Struct, String:StringT, Pointer, uint8, DecodeStream, EncodeStream} = require('../');
const should = require('chai').should();
const concat = require('concat-stream');
describe('Struct', function() {
describe('decode', function() {
it('should decode into an object', function() {
const stream = new DecodeStream(Buffer.from('\x05devon\x15'));
const struct = new Struct({
name: new StringT(uint8),
age: uint8
});
return struct.decode(stream).should.deep.equal({
name: 'devon',
age: 21
});
});
it('should support process hook', function() {
const stream = new DecodeStream(Buffer.from('\x05devon\x20'));
const struct = new Struct({
name: new StringT(uint8),
age: uint8
});
struct.process = function() {
return this.canDrink = this.age >= 21;
};
return struct.decode(stream).should.deep.equal({
name: 'devon',
age: 32,
canDrink: true
});
});
return it('should support function keys', function() {
const stream = new DecodeStream(Buffer.from('\x05devon\x20'));
const struct = new Struct({
name: new StringT(uint8),
age: uint8,
canDrink() { return this.age >= 21; }
});
return struct.decode(stream).should.deep.equal({
name: 'devon',
age: 32,
canDrink: true
});
});
});
describe('size', function() {
it('should compute the correct size', function() {
const struct = new Struct({
name: new StringT(uint8),
age: uint8
});
return struct.size({name: 'devon', age: 21}).should.equal(7);
});
it('should compute the correct size with pointers', function() {
const struct = new Struct({
name: new StringT(uint8),
age: uint8,
ptr: new Pointer(uint8, new StringT(uint8))
});
const size = struct.size({
name: 'devon',
age: 21,
ptr: 'hello'
});
return size.should.equal(14);
});
it('should get the correct size when no value is given', function() {
const struct = new Struct({
name: new StringT(4),
age: uint8
});
return struct.size().should.equal(5);
});
return it('should throw when getting non-fixed length size and no value is given', function() {
const struct = new Struct({
name: new StringT(uint8),
age: uint8
});
return should.throw(() => struct.size()
, /not a fixed size/i);
});
});
return describe('encode', function() {
it('should encode objects to buffers', function(done) {
const stream = new EncodeStream;
stream.pipe(concat(function(buf) {
buf.should.deep.equal(Buffer.from('\x05devon\x15'));
return done();
})
);
const struct = new Struct({
name: new StringT(uint8),
age: uint8
});
struct.encode(stream, {
name: 'devon',
age: 21
}
);
return stream.end();
});
it('should support preEncode hook', function(done) {
const stream = new EncodeStream;
stream.pipe(concat(function(buf) {
buf.should.deep.equal(Buffer.from('\x05devon\x15'));
return done();
})
);
const struct = new Struct({
nameLength: uint8,
name: new StringT('nameLength'),
age: uint8
});
struct.preEncode = function() {
return this.nameLength = this.name.length;
};
struct.encode(stream, {
name: 'devon',
age: 21
}
);
return stream.end();
});
return it('should encode pointer data after structure', function(done) {
const stream = new EncodeStream;
stream.pipe(concat(function(buf) {
buf.should.deep.equal(Buffer.from('\x05devon\x15\x08\x05hello'));
return done();
})
);
const struct = new Struct({
name: new StringT(uint8),
age: uint8,
ptr: new Pointer(uint8, new StringT(uint8))
});
struct.encode(stream, {
name: 'devon',
age: 21,
ptr: 'hello'
}
);
return stream.end();
});
});
});