303 lines
8.7 KiB
TypeScript
303 lines
8.7 KiB
TypeScript
import { debug, toHex } from '../util';
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import { bit, byte, word } from '../types';
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import { grabNibble } from './format_utils';
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import { DiskOptions, ENCODING_BITSTREAM, WozDisk } from './types';
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const WOZ_HEADER_START = 0;
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const WOZ_HEADER_SIZE = 12;
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const WOZ1_SIGNATURE = 0x315A4F57;
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const WOZ2_SIGNATURE = 0x325A4F57;
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const WOZ_INTEGRITY_CHECK = 0x0a0d0aff;
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/**
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* Converts a range of bytes from a DataView into an ASCII string
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*
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* @param data DataView containing string
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* @param start start index of string
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* @param end end index of string
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* @returns ASCII string
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*/
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function stringFromBytes(data: DataView, start: number, end: number): string {
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return String.fromCharCode.apply(
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null,
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new Uint8Array(data.buffer.slice(data.byteOffset + start, data.byteOffset + end))
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);
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}
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export class InfoChunk {
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version: byte;
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// Version 1
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diskType: byte;
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writeProtected: byte;
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synchronized: byte;
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cleaned: byte;
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creator: string;
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// Version 2
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sides: byte = 0;
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bootSector: byte = 0;
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bitTiming: byte = 0;
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compatibleHardware: word = 0;
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requiredRAM: word = 0;
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largestTrack: word = 0;
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constructor(data: DataView) {
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this.version = data.getUint8(0);
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this.diskType = data.getUint8(1);
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this.writeProtected = data.getUint8(2);
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this.synchronized = data.getUint8(3);
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this.cleaned = data.getUint8(4);
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this.creator = stringFromBytes(data, 5, 37);
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if (this.version > 1) {
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this.sides = data.getUint8(37);
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this.bootSector = data.getUint8(38);
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this.bitTiming = data.getUint8(39);
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this.compatibleHardware = data.getUint16(40, true);
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this.requiredRAM = data.getUint16(42, true);
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this.largestTrack = data.getUint16(44, true);
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}
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}
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}
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export class TMapChunk {
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trackMap: byte[];
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constructor(data: DataView) {
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this.trackMap = [];
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for (let idx = 0; idx < 160; idx++) {
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this.trackMap.push(data.getUint8(idx));
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}
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}
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}
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const WOZ_TRACK_SIZE = 6656;
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const WOZ_TRACK_INFO_BITS = 6648;
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export class TrksChunk {
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rawTracks: Uint8Array[];
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tracks: Uint8Array[];
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}
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export class TrksChunk1 extends TrksChunk {
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constructor(data: DataView) {
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super();
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this.rawTracks = [];
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this.tracks = [];
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for (let trackNo = 0, idx = 0; idx < data.byteLength; idx += WOZ_TRACK_SIZE, trackNo++) {
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let track = [];
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const rawTrack: bit[] = [];
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const slice = data.buffer.slice(data.byteOffset + idx, data.byteOffset + idx + WOZ_TRACK_SIZE);
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const trackData = new Uint8Array(slice);
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const trackInfo = new DataView(slice);
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const trackBitCount = trackInfo.getUint16(WOZ_TRACK_INFO_BITS, true);
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for (let jdx = 0; jdx < trackBitCount; jdx++) {
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const byteIndex = jdx >> 3;
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const bitIndex = 7 - (jdx & 0x07);
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rawTrack[jdx] = (trackData[byteIndex] >> bitIndex) & 0x01 ? 1 : 0;
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}
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track = [];
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let offset = 0;
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while (offset < rawTrack.length) {
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const result = grabNibble(rawTrack, offset);
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if (!result.nibble) { break; }
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track.push(result.nibble);
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offset = result.offset + 1;
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}
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this.tracks[trackNo] = new Uint8Array(track);
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this.rawTracks[trackNo] = new Uint8Array(rawTrack);
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}
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}
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}
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export interface Trk {
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startBlock: word
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blockCount: word
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bitCount: number
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}
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export class TrksChunk2 extends TrksChunk {
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trks: Trk[];
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constructor (data: DataView) {
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super();
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let trackNo;
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this.trks = [];
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for (trackNo = 0; trackNo < 160; trackNo++) {
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const startBlock = data.getUint16(trackNo * 8, true);
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const blockCount = data.getUint16(trackNo * 8 + 2, true);
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const bitCount = data.getUint32(trackNo * 8 + 4, true);
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if (bitCount === 0) { break; }
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this.trks.push({
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startBlock: startBlock,
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blockCount: blockCount,
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bitCount: bitCount
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});
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}
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this.tracks = [];
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this.rawTracks = [];
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const bits = data.buffer;
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for (trackNo = 0; trackNo < this.trks.length; trackNo++) {
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const trk = this.trks[trackNo];
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let track = [];
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const rawTrack: bit[] = [];
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const start = trk.startBlock * 512;
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const end = start + trk.blockCount * 512;
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const slice = bits.slice(start, end);
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const trackData = new Uint8Array(slice);
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for (let jdx = 0; jdx < trk.bitCount; jdx++) {
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const byteIndex = jdx >> 3;
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const bitIndex = 7 - (jdx & 0x07);
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rawTrack[jdx] = (trackData[byteIndex] >> bitIndex) & 0x01 ? 1 : 0;
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}
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track = [];
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let offset = 0;
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while (offset < rawTrack.length) {
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const result = grabNibble(rawTrack, offset);
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if (!result.nibble) { break; }
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track.push(result.nibble);
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offset = result.offset + 1;
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}
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this.tracks[trackNo] = new Uint8Array(track);
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this.rawTracks[trackNo] = new Uint8Array(rawTrack);
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}
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}
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}
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export class MetaChunk {
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values: Record<string, string>;
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constructor (data: DataView) {
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const infoStr = stringFromBytes(data, 0, data.byteLength);
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const parts = infoStr.split('\n');
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this.values = parts.reduce(function(acc: Record<string, string>, part) {
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const subParts = part.split('\t');
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acc[subParts[0]] = subParts[1];
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return acc;
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}, {});
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}
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}
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interface Chunks {
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[key: string]: any
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info?: InfoChunk
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tmap?: TMapChunk
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trks?: TrksChunk
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meta?: MetaChunk
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}
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/**
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* Returns a `Disk` object from Woz image data.
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* @param options the disk image and options
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* @returns A bitstream disk
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*/
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export default function createDiskFromWoz(options: DiskOptions): WozDisk {
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const { rawData } = options;
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if (!rawData) {
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throw new Error('Requires rawData');
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}
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const dv = new DataView(rawData, 0);
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let dvOffset = 0;
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let wozVersion;
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const chunks: Chunks = {};
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function readHeader() {
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const wozSignature = dv.getUint32(WOZ_HEADER_START + 0, true);
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switch (wozSignature) {
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case WOZ1_SIGNATURE:
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wozVersion = 1;
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break;
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case WOZ2_SIGNATURE:
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wozVersion = 2;
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break;
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default:
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return false;
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}
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if (dv.getUint32(WOZ_HEADER_START + 4, true) !== WOZ_INTEGRITY_CHECK) {
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return false;
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}
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return true;
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}
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function readChunk() {
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if (dvOffset >= dv.byteLength) {
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return null;
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}
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const type = dv.getUint32(dvOffset, true);
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const size = dv.getUint32(dvOffset + 4, true);
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const data = new DataView(dv.buffer, dvOffset + 8, size);
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dvOffset += size + 8;
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return {
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type: type,
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size: size,
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data: data
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};
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}
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if (readHeader()) {
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dvOffset = WOZ_HEADER_SIZE;
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let chunk = readChunk();
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while (chunk) {
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switch (chunk.type) {
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case 0x4F464E49: // INFO
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chunks.info = new InfoChunk(chunk.data);
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break;
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case 0x50414D54: // TMAP
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chunks.tmap = new TMapChunk(chunk.data);
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break;
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case 0x534B5254: // TRKS
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if (wozVersion === 1) {
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chunks.trks = new TrksChunk1(chunk.data);
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} else {
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chunks.trks = new TrksChunk2(chunk.data);
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}
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break;
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case 0x4154454D: // META
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chunks.meta = new MetaChunk(chunk.data);
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break;
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case 0x54495257: // WRIT
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// Ignore
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break;
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default:
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debug('Unsupported chunk', toHex(chunk.type, 8));
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}
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chunk = readChunk();
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}
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} else {
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debug('Invalid woz header');
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}
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debug(chunks);
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const { meta, tmap, trks } = chunks;
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const disk: WozDisk = {
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encoding: ENCODING_BITSTREAM,
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trackMap: tmap?.trackMap || [],
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tracks: trks?.tracks || [],
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rawTracks: trks?.rawTracks || [],
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readOnly: true, //chunks.info.writeProtected === 1;
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name: meta?.values['title'] || options.name,
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side: meta?.values['side_name'] || meta?.values['side'],
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};
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return disk;
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}
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