| // Copyright 2022 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| |
| /* eslint-env browser */ |
| |
| import {Encoder} from './encoder'; |
| import * as protocol from './protocol'; |
| import * as util from './util'; |
| |
| const FLAG = Uint8Array.from([protocol.FLAG]); |
| |
| function withFCS(data: Uint8Array): Uint8Array { |
| return util.concatenate(data, protocol.frameCheckSequence(data)); |
| } |
| |
| function withFlags(data: Uint8Array): Uint8Array { |
| return util.concatenate(FLAG, data, FLAG); |
| } |
| |
| describe('Encoder', () => { |
| let encoder: Encoder; |
| let textEncoder: TextEncoder; |
| |
| beforeEach(() => { |
| encoder = new Encoder(); |
| textEncoder = new TextEncoder(); |
| }); |
| |
| it('creates frame for empty data', () => { |
| const data = textEncoder.encode(''); |
| expect(encoder.uiFrame(0, data)).toEqual( |
| withFlags(withFCS(new Uint8Array([0x01, 0x03]))) |
| ); |
| expect(encoder.uiFrame(0x1a, data)).toEqual( |
| withFlags(withFCS(new Uint8Array([0x35, 0x03]))) |
| ); |
| expect(encoder.uiFrame(0x1a, data)).toEqual( |
| withFlags(withFCS(textEncoder.encode('\x35\x03'))) |
| ); |
| }); |
| |
| it('creates frame for one byte', () => { |
| const data = textEncoder.encode('A'); |
| expect(encoder.uiFrame(0, data)).toEqual( |
| withFlags(withFCS(textEncoder.encode('\x01\x03A'))) |
| ); |
| }); |
| |
| it('creates frame for multibyte data', () => { |
| const data = textEncoder.encode('123456789'); |
| expect(encoder.uiFrame(0, data)).toEqual( |
| withFlags(withFCS(textEncoder.encode('\x01\x03123456789'))) |
| ); |
| }); |
| |
| it('creates frame for multibyte data with address', () => { |
| const data = textEncoder.encode('123456789'); |
| expect(encoder.uiFrame(128, data)).toEqual( |
| withFlags(withFCS(textEncoder.encode('\x00\x03\x03123456789'))) |
| ); |
| }); |
| |
| it('creates frame for data with escape sequence', () => { |
| const data = textEncoder.encode('\x7d'); |
| const expectedContent = util.concatenate( |
| textEncoder.encode('\x7d\x5d\x03\x7d\x5d'), |
| protocol.frameCheckSequence(textEncoder.encode('\x7d\x03\x7d')) |
| ); |
| expect(encoder.uiFrame(0x3e, data)).toEqual(withFlags(expectedContent)); |
| |
| const data2 = textEncoder.encode('A\x7e\x7dBC'); |
| const expectedContent2 = util.concatenate( |
| textEncoder.encode('\x7d\x5d\x03A\x7d\x5e\x7d\x5dBC'), |
| protocol.frameCheckSequence(textEncoder.encode('\x7d\x03A\x7e\x7dBC')) |
| ); |
| expect(encoder.uiFrame(0x3e, data2)).toEqual(withFlags(expectedContent2)); |
| }); |
| }); |