288 lines
10 KiB
TypeScript
288 lines
10 KiB
TypeScript
import DOS from '../../../js/formats/do';
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import { memory } from '../../../js/types';
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import { BYTES_BY_SECTOR, BYTES_BY_TRACK } from './testdata/16sector';
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import { expectSequence, findBytes, skipGap } from './util';
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describe('DOS format', () => {
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it('is callable', () => {
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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expect(disk).not.toBeNull();
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});
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it('has correct number of tracks', () => {
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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expect(disk.tracks.length).toEqual(35);
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});
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it('has correct number of bytes in track 0', () => {
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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expect(disk.tracks[0].length).toEqual(6632);
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});
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it('has correct number of bytes in all tracks', () => {
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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// Track 0 is slightly longer for some reason.
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expect(disk.tracks[0].length).toEqual(6632);
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for (let i = 1; i < disk.tracks.length; i++) {
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expect(disk.tracks[i].length).toEqual(6602);
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}
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});
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it('has correct GAP 1', () => {
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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// From Beneith Apple DOS, GAP 1 should have 12-85 0xFF bytes
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const track = disk.tracks[0];
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let numFF = 0;
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while (track[numFF] == 0xFF && numFF < 0x100) {
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numFF++;
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}
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expect(numFF).toBeGreaterThanOrEqual(40);
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expect(numFF).toBeLessThanOrEqual(128);
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});
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it('has correct Address Field for track 0, sector 0', () => {
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// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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const track = disk.tracks[0];
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let i = skipGap(track);
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// prologue
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i = expectSequence(track, i, [0xD5, 0xAA, 0x96]);
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// volume 10 = 0b00001010
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101010);
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// track 0 = 0b00000000
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expect(track[i++]).toBe(0b10101010);
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expect(track[i++]).toBe(0b10101010);
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// sector 0 = 0b00000000
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expect(track[i++]).toBe(0b10101010);
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expect(track[i++]).toBe(0b10101010);
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// checksum = 0b00000101
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101010);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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});
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it('has correct Data Field for track 0, sector 0 (BYTES_BY_TRACK)', () => {
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// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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const track: memory = disk.tracks[0];
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// skip to the first address epilogue
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let i = findBytes(track, [0xDE, 0xAA, 0xEB]);
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expect(i).toBeGreaterThan(50);
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i = skipGap(track, i);
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// prologue
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i = expectSequence(track, i, [0xD5, 0xAA, 0xAD]);
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// data (all zeros, which is 0x96 with 6 and 2 encoding)
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for (let j = 0; j < 342; j++) {
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expect(track[i++]).toBe(0x96);
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}
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// checksum (also zero)
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expect(track[i++]).toBe(0x96);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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});
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it('has correct Address Field for track 0, sector 1', () => {
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// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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const track = disk.tracks[0];
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// first sector prologue
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let i = findBytes(track, [0xD5, 0xAA, 0x96]);
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// second sector prologue
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i = findBytes(track, [0xD5, 0xAA, 0x96], i);
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// volume 10 = 0b00001010
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101010);
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// track 0 = 0b00000000
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expect(track[i++]).toBe(0b10101010);
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expect(track[i++]).toBe(0b10101010);
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// sector 1 = 0b00000001
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expect(track[i++]).toBe(0b10101010);
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expect(track[i++]).toBe(0b10101011);
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// checksum = 0b00000101
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101011);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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});
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it('has correct Data Field for track 0, sector 1 (BYTES_BY_SECTOR)', () => {
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// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_SECTOR,
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volume: 10,
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readOnly: true,
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});
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const track: memory = disk.tracks[0];
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// First data field prologue
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let i = findBytes(track, [0xD5, 0xAA, 0xAD]);
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// Second data field prologue
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i = findBytes(track, [0xD5, 0xAA, 0xAD], i);
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// Sector 1 is DOS sector 7.
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// In 6 x 2 encoding, the lowest 2 bits of all the bytes come first.
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// 0x07 is 0b00000111, so the lowest two bits are 0b11, reversed and
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// repeated would be 0b111111 (3F -> 0xFF), but since each byte is
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// XOR'd with the previous, this means there are 85 0b00000000 (00 ->
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// 0x96) bytes.
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expect(track[i++]).toBe(0xFF);
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for (let j = 0; j < 85; j++) {
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expect(track[i++]).toBe(0x96);
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}
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// Next we get 256 instances of the top bits, 0b000001. Again, with
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// the XOR, this means one 0b000001 XOR 0b111111 = 0b111110
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// (3E -> 0xFE) followed by 255 0b0000000 (00 -> 0x96).
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expect(track[i++]).toBe(0xFE);
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for (let j = 0; j < 255; j++) {
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expect(track[i++]).toBe(0x96);
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}
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// checksum
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expect(track[i++]).toBe(0x97);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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});
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it('has correct Address Field for track 1, sector 0', () => {
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// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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const track = disk.tracks[1];
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let i = skipGap(track);
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// prologue
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i = expectSequence(track, i, [0xD5, 0xAA, 0x96]);
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// volume 10 = 0b00001010
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101010);
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// track 1 = 0b00000001
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expect(track[i++]).toBe(0b10101010);
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expect(track[i++]).toBe(0b10101011);
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// sector 0 = 0b00000000
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expect(track[i++]).toBe(0b10101010);
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expect(track[i++]).toBe(0b10101010);
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// checksum = 0b00000100
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101011);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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});
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it('has correct Data Field for track 1, sector 0 (BYTES_BY_TRACK)', () => {
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// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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const track: memory = disk.tracks[1];
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let i = findBytes(track, [0xDE, 0xAA, 0xEB]);
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expect(i).toBeGreaterThan(50);
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i = skipGap(track, i);
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// prologue
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i = expectSequence(track, i, [0xD5, 0xAA, 0xAD]);
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// In 6 x 2 encoding, the lowest 2 bits of all the bytes come first.
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// This would normally mean 86 instances of 0b101010 (2A -> 0xE6),
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// but each byte is XOR'd with the previous. Since all of the bits
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// are the same, this means there are 85 0b000000 (00 -> 0x96).
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expect(track[i++]).toBe(0xE6);
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for (let j = 0; j < 85; j++) {
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expect(track[i++]).toBe(0x96);
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}
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// Next we get 256 instances of the top bits, 0b000000. Again, with
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// the XOR, this means one 0x101010 (2A -> 0xE6) followed by 255
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// 0b0000000 (00 -> 0x96).
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expect(track[i++]).toBe(0xE6);
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for (let j = 0; j < 255; j++) {
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expect(track[i++]).toBe(0x96);
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}
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// checksum (also zero)
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expect(track[i++]).toBe(0x96);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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});
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it('has correct Address Fields for all tracks', () => {
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// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
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const disk = DOS({
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name: 'test disk',
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data: BYTES_BY_TRACK,
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volume: 10,
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readOnly: true,
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});
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for (let t = 0; t < disk.tracks.length; t++) {
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// We essentially seek through the track for the Address Fields
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const track = disk.tracks[t];
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let i = findBytes(track, [0xD5, 0xAA, 0x96]);
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for (let s = 0; s <= 15; s++) {
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// volume 10 = 0b00001010
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expect(track[i++]).toBe(0b10101111);
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expect(track[i++]).toBe(0b10101010);
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// convert track to 4x4 encoding
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const track4x4XX = ((t & 0b10101010) >> 1) | 0b10101010;
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const track4x4YY = (t & 0b01010101) | 0b10101010;
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expect(track[i++]).toBe(track4x4XX);
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expect(track[i++]).toBe(track4x4YY);
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// convert sector to 4x4 encoding
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const sector4x4XX = ((s & 0b10101010) >> 1) | 0b10101010;
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const sector4x4YY = (s & 0b01010101) | 0b10101010;
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expect(track[i++]).toBe(sector4x4XX);
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expect(track[i++]).toBe(sector4x4YY);
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// checksum
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expect(track[i++]).toBe(0b10101111 ^ track4x4XX ^ sector4x4XX);
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expect(track[i++]).toBe(0b10101010 ^ track4x4YY ^ sector4x4YY);
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// epilogue
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i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
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// next sector
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i = findBytes(track, [0xD5, 0xAA, 0x96], i);
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}
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}
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});
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});
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