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apple2js/test/js/formats/sources.spec.ts

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import './matchers';
import { ByteArrayByteSource, ProdosOrderedTrackSectorSource, ByteTrackSectorSource, TrackSector5x3NibbleTrackSource, TrackSector6x2NibbleTrackSource, DosOrderedTrackSectorSource } from 'js/formats/sources';
import { BYTES_BY_SECTOR_IMAGE, BYTES_BY_TRACK_IMAGE } from './testdata/16sector';
import { BYTES_BY_SECTOR_IMAGE as S13_BYTES_BY_SECTOR_IMAGE, BYTES_BY_TRACK_IMAGE as S13_BYTES_BY_TRACK_IMAGE } from './testdata/13sector';
import { D13O, DO, PO } from 'js/formats/format_utils';
import { expectSequence, findBytes, skipGap } from './util';
describe('ProdosOrderedTrackSectorSource', () => {
it('returns the correct logical sector for each physical sector', () => {
const byteSource = new ByteArrayByteSource(BYTES_BY_SECTOR_IMAGE);
const byteTrackSectorSource = new ByteTrackSectorSource(byteSource);
const prodosTrackSectorSource = new ProdosOrderedTrackSectorSource(byteTrackSectorSource);
for (let s = 0; s < 16; s++) {
const sector = prodosTrackSectorSource.read(0, s);
const expected = new Uint8Array(256).fill(PO[s]);
expect(sector).equalsUint8Array(expected);
}
});
});
describe('DosOrderedByteTrackSectorSource', () => {
it('returns the correct logical sector for each physical sector', () => {
const byteSource = new ByteArrayByteSource(BYTES_BY_SECTOR_IMAGE);
const byteTrackSectorSource = new ByteTrackSectorSource(byteSource);
const dosTrackSectorSource = new DosOrderedTrackSectorSource(byteTrackSectorSource);
for (let s = 0; s < 16; s++) {
const sector = dosTrackSectorSource.read(0, s);
const expected = new Uint8Array(256).fill(DO[s]);
expect(sector).equalsUint8Array(expected);
}
});
});
describe('TrackSector6x2NibbleTrackSource', () => {
const nibbleTrackSource = (image: Uint8Array = BYTES_BY_TRACK_IMAGE) => {
const byteSource = new ByteArrayByteSource(image);
const byteTrackSectorSource = new ByteTrackSectorSource(byteSource);
const prodosTrackSectorSource = new ProdosOrderedTrackSectorSource(byteTrackSectorSource);
return new TrackSector6x2NibbleTrackSource(prodosTrackSectorSource, 10);
};
it('has correct number of tracks', () => {
const trackSectorNibbleTrackSource = nibbleTrackSource();
expect(trackSectorNibbleTrackSource.numTracks()).toBe(35);
});
it('has correct number of bytes in all tracks', () => {
// Track 0 is slightly longer for some reason.
const trackSectorNibbleTrackSource = nibbleTrackSource();
expect(trackSectorNibbleTrackSource.read(0).length).toEqual(6632);
for (let i = 1; i < trackSectorNibbleTrackSource.numTracks(); i++) {
expect(trackSectorNibbleTrackSource.read(i).length).toEqual(6602);
}
});
it('has correct GAP 1', () => {
// From Beneith Apple DOS, GAP 1 should have 12-85 0xFF bytes
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
let numFF = 0;
while (track[numFF] === 0xFF && numFF < 0x100) {
numFF++;
}
expect(numFF).toBeGreaterThanOrEqual(40);
expect(numFF).toBeLessThanOrEqual(128);
});
it('has correct Address Field for track 0, sector 0', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
let i = skipGap(track);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0x96]);
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// track 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// sector 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// checksum = 0b00000101
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Data Field for track 0, sector 0 (BYTES_BY_TRACK)', () => {
// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
// skip to the first address epilogue
let i = findBytes(track, [0xDE, 0xAA, 0xEB]);
expect(i).toBeGreaterThan(50);
i = skipGap(track, i);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0xAD]);
// data (all zeros, which is 0x96 with 6 and 2 encoding)
for (let j = 0; j < 342; j++) {
expect(track[i++]).toBe(0x96);
}
// checksum (also zero)
expect(track[i++]).toBe(0x96);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Address Field for track 0, sector 1', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
// first sector prologue
let i = findBytes(track, [0xD5, 0xAA, 0x96]);
// second sector prologue
i = findBytes(track, [0xD5, 0xAA, 0x96], i);
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// track 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// sector 1 = 0b00000001
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101011);
// checksum = 0b00000101
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101011);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Data Field for track 0, sector 1 (BYTES_BY_SECTOR)', () => {
// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
const trackSectorNibbleTrackSource = nibbleTrackSource(BYTES_BY_SECTOR_IMAGE);
const track = trackSectorNibbleTrackSource.read(0);
// First data field prologue
let i = findBytes(track, [0xD5, 0xAA, 0xAD]);
// Second data field prologue
i = findBytes(track, [0xD5, 0xAA, 0xAD], i);
// Sector 1 is ProDOS sector 8.
// In 6 x 2 encoding, the lowest 2 bits of all the bytes come first.
// 0x07 is 0b00001000, so the lowest two bits are 0b00, reversed and
// repeated would be 0b000000 (00 -> 0x96). Even though each byte is
// XOR'd with the previous, they are all the same. This means there
// are 86 0b00000000 (00 -> 0x96) bytes.
for (let j = 0; j < 86; j++) {
expect(track[i++]).toBe(0x96);
}
// Next we get 256 instances of the top bits, 0b000010. Again, with
// the XOR, this means one 0b000010 XOR 0b000000 = 0b000010
// (02 -> 0x9A) followed by 255 0b0000000 (00 -> 0x96).
expect(track[i++]).toBe(0x9A);
for (let j = 0; j < 255; j++) {
expect(track[i++]).toBe(0x96);
}
// checksum 0b000010 XOR 0b000000 -> 9A
expect(track[i++]).toBe(0x9A);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Address Field for track 1, sector 0', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(1);
let i = skipGap(track);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0x96]);
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// track 1 = 0b00000001
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101011);
// sector 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// checksum = 0b00000100
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101011);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Data Field for track 1, sector 0 (BYTES_BY_TRACK)', () => {
// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
const trackSectorNibbleTrackSource = nibbleTrackSource(BYTES_BY_TRACK_IMAGE);
const track = trackSectorNibbleTrackSource.read(1);
let i = findBytes(track, [0xDE, 0xAA, 0xEB]);
expect(i).toBeGreaterThan(50);
i = skipGap(track, i);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0xAD]);
// In 6 x 2 encoding, the lowest 2 bits of all the bytes come first.
// This would normally mean 86 instances of 0b101010 (2A -> 0xE6),
// but each byte is XOR'd with the previous. Since all of the bits
// are the same, this means there are 85 0b000000 (00 -> 0x96).
expect(track[i++]).toBe(0xE6);
for (let j = 0; j < 85; j++) {
expect(track[i++]).toBe(0x96);
}
// Next we get 256 instances of the top bits, 0b000000. Again, with
// the XOR, this means one 0x101010 (2A -> 0xE6) followed by 255
// 0b0000000 (00 -> 0x96).
expect(track[i++]).toBe(0xE6);
for (let j = 0; j < 255; j++) {
expect(track[i++]).toBe(0x96);
}
// checksum (also zero)
expect(track[i++]).toBe(0x96);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Address Fields for all tracks', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource(BYTES_BY_TRACK_IMAGE);
for (let t = 0; t < trackSectorNibbleTrackSource.numTracks(); t++) {
// We essentially seek through the track for the Address Fields
const track = trackSectorNibbleTrackSource.read(t);
let i = findBytes(track, [0xD5, 0xAA, 0x96]);
for (let s = 0; s <= 15; s++) {
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// convert track to 4x4 encoding
const track4x4XX = ((t & 0b10101010) >> 1) | 0b10101010;
const track4x4YY = (t & 0b01010101) | 0b10101010;
expect(track[i++]).toBe(track4x4XX);
expect(track[i++]).toBe(track4x4YY);
// convert sector to 4x4 encoding
const sector4x4XX = ((s & 0b10101010) >> 1) | 0b10101010;
const sector4x4YY = (s & 0b01010101) | 0b10101010;
expect(track[i++]).toBe(sector4x4XX);
expect(track[i++]).toBe(sector4x4YY);
// checksum
expect(track[i++]).toBe(0b10101111 ^ track4x4XX ^ sector4x4XX);
expect(track[i++]).toBe(0b10101010 ^ track4x4YY ^ sector4x4YY);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
// next sector
i = findBytes(track, [0xD5, 0xAA, 0x96], i);
}
}
});
});
describe('TrackSector5x3NibbleTrackSource', () => {
const nibbleTrackSource = (image: Uint8Array = S13_BYTES_BY_TRACK_IMAGE) => {
const byteSource = new ByteArrayByteSource(image);
const dos32TrackSectorSource = new ByteTrackSectorSource(byteSource, 13);
return new TrackSector5x3NibbleTrackSource(dos32TrackSectorSource, 10);
};
it('has correct number of tracks', () => {
const trackSectorNibbleTrackSource = nibbleTrackSource();
expect(trackSectorNibbleTrackSource.numTracks()).toBe(35);
});
it('has correct number of bytes in all tracks', () => {
// Track 0 is slightly longer for some reason.
const trackSectorNibbleTrackSource = nibbleTrackSource();
expect(trackSectorNibbleTrackSource.read(0).length).toEqual(6289);
for (let i = 1; i < trackSectorNibbleTrackSource.numTracks(); i++) {
expect(trackSectorNibbleTrackSource.read(i).length).toEqual(6265);
}
});
it('has correct GAP 1', () => {
// From Beneith Apple DOS, GAP 1 should have 12-85 0xFF bytes
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
let numFF = 0;
while (track[numFF] === 0xFF && numFF < 0x100) {
numFF++;
}
expect(numFF).toBeGreaterThanOrEqual(40);
expect(numFF).toBeLessThanOrEqual(128);
});
// eslint-disable-next-line jest/no-identical-title
it('has correct GAP 1', () => {
// From Beneith Apple DOS, GAP 1 should have 12-85 0xFF bytes
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
let numFF = 0;
while (track[numFF] === 0xFF && numFF < 0x100) {
numFF++;
}
expect(numFF).toBeGreaterThanOrEqual(40);
expect(numFF).toBeLessThanOrEqual(128);
});
it('has correct Address Field for track 0, sector 0', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(0);
let i = skipGap(track);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0xB5]);
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// track 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// sector 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// checksum = 0b00000101
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Data Field for track 0, sector 0 (BYTES_BY_TRACK)', () => {
// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
const trackSectorNibbleTrackSource = nibbleTrackSource(S13_BYTES_BY_TRACK_IMAGE);
const track = trackSectorNibbleTrackSource.read(0);
// skip to the first address epilogue
let i = findBytes(track, [0xDE, 0xAA, 0xEB]);
expect(i).toBeGreaterThan(50);
i = skipGap(track, i);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0xAD]);
// data (all zeros, which is 0xAB with 5 and 3 encoding)
for (let j = 0; j < 410; j++) {
expect(track[i++]).toBe(0xAB);
}
// checksum (also zero)
expect(track[i++]).toBe(0xAB);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Address Field for track 0, sector 1', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource(S13_BYTES_BY_TRACK_IMAGE);
const track = trackSectorNibbleTrackSource.read(0);
// first sector prologue
let i = findBytes(track, [0xD5, 0xAA, 0xB5]);
// second sector prologue
i = findBytes(track, [0xD5, 0xAA, 0xB5], i);
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// track 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// sector A = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// checksum = 0b00000101
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Data Field for track 0, disk sector 1 (BYTES_BY_SECTOR)', () => {
// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
const trackSectorNibbleTrackSource = nibbleTrackSource(S13_BYTES_BY_SECTOR_IMAGE);
const track = trackSectorNibbleTrackSource.read(0);
// First data field prologue
let i = findBytes(track, [0xD5, 0xAA, 0xAD]);
// Second data field prologue
i = findBytes(track, [0xD5, 0xAA, 0xAD], i);
// Sector 1 is physical/DOS sector A.
// In 5 x 3 encoding, the lowest 3 bits of all the bytes come first,
// all mixed up in a crazy order. 0x0A is 0b00001010, so the lowest
// 3 bits are 0b010. With mixing (see Figure 3.18), this becomes:
// 0b01000, 0b01011, 0b01000
// repeated. These chunks come in repeated blocks of 0x33 (51) bytes.
//
// Because 51 * 5 is 255, there is one odd byte that is treated
// specially at the beginning.
//
// Lower 3 bits of last byte:
// 0b00010 = 0b00010 (02 -> AE)
expect(track[i++]).toBe(0xAE);
//
// Bottom 3 bits in block 1 (08 block):
// 0b01000 XOR 0b00010 = 0b01010 (0A -> BE)
// 0b01000 XOR 0b01000 = 0b00000 (00 -> AB) x 50
expect(track[i++]).toBe(0xBE);
for (let j = 0; j < 50; j++) {
expect(track[i++]).toBe(0xAB);
}
//
// Bottom 3 bits in block 2 (0B block):
// 0b01011 XOR 0b01000 = 0b00011 (03 -> AF)
// 0b01011 XOR 0b01011 = 0b00000 (00 -> AB) x 50
expect(track[i++]).toBe(0xAF);
for (let j = 0; j < 50; j++) {
expect(track[i++]).toBe(0xAB);
}
//
// Bottom 3 bits in block 1 (08 block):
// 0b01000 XOR 0b01011 = 0b00011 (03 -> AF)
// 0b01000 XOR 0b01000 = 0b00000 (00 -> AB) x 50
expect(track[i++]).toBe(0xAF);
for (let j = 0; j < 50; j++) {
expect(track[i++]).toBe(0xAB);
}
// Upper 5 bits of 0x0A are 0x00001:
// 0b00001 XOR 0b01000 = 0b01001 (09 -> BD)
// 0b00001 XOR 0b00001 = 0b00000 (00 -> AB) x 255
expect(track[i++]).toBe(0xBD);
for (let j = 0; j < 255; j++) {
expect(track[i++]).toBe(0xAB);
}
// checksum 0b00001 (01 -> AD)
expect(track[i++]).toBe(0xAD);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Address Field for track 1, sector 0', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource();
const track = trackSectorNibbleTrackSource.read(1);
let i = skipGap(track);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0xB5]);
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// track 1 = 0b00000001
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101011);
// sector 0 = 0b00000000
expect(track[i++]).toBe(0b10101010);
expect(track[i++]).toBe(0b10101010);
// checksum = 0b00000100
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101011);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Data Field for track 1, sector 0 (BYTES_BY_TRACK)', () => {
// _Beneath Apple DOS_, DATA FIELD ENCODING, pp. 3-13 to 3-21
const trackSectorNibbleTrackSource = nibbleTrackSource(S13_BYTES_BY_TRACK_IMAGE);
const track = trackSectorNibbleTrackSource.read(1);
let i = findBytes(track, [0xDE, 0xAA, 0xEB]);
expect(i).toBeGreaterThan(50);
i = skipGap(track, i);
// prologue
i = expectSequence(track, i, [0xD5, 0xAA, 0xAD]);
// Expect data to be all 1s (track number).
// In 5 x 3 encoding, the lowest 3 bits of all the bytes come first,
// all mixed up in a crazy order. 0x01 is 0b00000001, so the lowest
// 3 bits are 0b001. With mixing (see Figure 3.18), this becomes:
// 0b00111, 0b00100, 0b00100
// repeated. These chunks come in repeated blocks of 0x33 (51) bytes.
//
// Because 51 * 5 is 255, there is one odd byte that is treated
// specially at the beginning.
//
// Lower 3 bits of last byte:
// 0b00001 = 0b00001 (01 -> AD)
expect(track[i++]).toBe(0xAD);
//
// Bottom 3 bits in block 1 (07 block):
// 0b00111 XOR 0b00001 = 0b00110 (06 -> B7)
// 0b00111 XOR 0b00111 = 0b00000 (00 -> AB) x 50
expect(track[i++]).toBe(0xB7);
for (let j = 0; j < 50; j++) {
expect(track[i++]).toBe(0xAB);
}
//
// Bottom 3 bits in block 2 (04 block):
// 0b00111 XOR 0b00100 = 0b00011 (03 -> AF)
// 0b00100 XOR 0b00100 = 0b00000 (00 -> AB) x 50
expect(track[i++]).toBe(0xAF);
for (let j = 0; j < 50; j++) {
expect(track[i++]).toBe(0xAB);
}
//
// Bottom 3 bits in block 1 (04 block):
// 0b00100 XOR 0b00100 = 0b00011 (00 -> AB)
// 0b00100 XOR 0b00100 = 0b00000 (00 -> AB) x 50
expect(track[i++]).toBe(0xAB);
for (let j = 0; j < 50; j++) {
expect(track[i++]).toBe(0xAB);
}
// Upper 5 bits of 0x01 are 0x00000:
// 0b00000 XOR 0b00100 = 0b00100 (04 -> B5)
// 0b00000 XOR 0b00000 = 0b00000 (00 -> AB) x 255
expect(track[i++]).toBe(0xB5);
for (let j = 0; j < 255; j++) {
expect(track[i++]).toBe(0xAB);
}
// checksum 0b00000 (00 -> AB)
expect(track[i++]).toBe(0xAB);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
});
it('has correct Address Fields for all tracks', () => {
// _Beneath Apple DOS_, TRACK FORMATTING, p. 3-12
const trackSectorNibbleTrackSource = nibbleTrackSource();
for (let t = 0; t < trackSectorNibbleTrackSource.numTracks(); t++) {
// We essentially seek through the track for the Address Fields
const track = trackSectorNibbleTrackSource.read(t);
let i = findBytes(track, [0xD5, 0xAA, 0xB5]);
for (let s = 0; s <= 12; s++) {
// volume 10 = 0b00001010
expect(track[i++]).toBe(0b10101111);
expect(track[i++]).toBe(0b10101010);
// convert track to 4x4 encoding
const track4x4XX = ((t & 0b10101010) >> 1) | 0b10101010;
const track4x4YY = (t & 0b01010101) | 0b10101010;
expect(track[i++]).toBe(track4x4XX);
expect(track[i++]).toBe(track4x4YY);
// convert sector to 4x4 encoding
const ss = D13O[s];
const sector4x4XX = ((ss & 0b10101010) >> 1) | 0b10101010;
const sector4x4YY = (ss & 0b01010101) | 0b10101010;
expect(track[i++]).toBe(sector4x4XX);
expect(track[i++]).toBe(sector4x4YY);
// checksum
expect(track[i++]).toBe(0b10101111 ^ track4x4XX ^ sector4x4XX);
expect(track[i++]).toBe(0b10101010 ^ track4x4YY ^ sector4x4YY);
// epilogue
i = expectSequence(track, i, [0xDE, 0xAA, 0xEB]);
// next sector
i = findBytes(track, [0xD5, 0xAA, 0xB5], i);
}
}
});
});
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