45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
import { explodeSector16, PO } from './format_utils';
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import { bytify } from '../util';
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import type { byte } from '../types';
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import { NibbleDisk, DiskOptions, ENCODING_NIBBLE } from './types';
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/**
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* Returns a `Disk` object from ProDOS-ordered image data.
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* @param options the disk image and options
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* @returns A nibblized disk
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*/
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export default function createDiskFromProDOS(options: DiskOptions) {
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const { data, name, side, rawData, volume, readOnly } = options;
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const disk: NibbleDisk = {
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format: 'nib',
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encoding: ENCODING_NIBBLE,
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name,
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side,
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volume: volume || 254,
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tracks: [],
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readOnly: readOnly || false,
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};
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for (let physical_track = 0; physical_track < 35; physical_track++) {
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let track: byte[] = [];
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for (let physical_sector = 0; physical_sector < 16; physical_sector++) {
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const prodos_sector = PO[physical_sector];
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let sector;
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if (rawData) {
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const off = (16 * physical_track + prodos_sector) * 256;
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sector = new Uint8Array(rawData.slice(off, off + 256));
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} else if (data) {
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sector = data[physical_track][prodos_sector];
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} else {
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throw new Error('Requires data or rawData');
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}
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track = track.concat(
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explodeSector16(volume, physical_track, physical_sector, sector)
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);
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}
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disk.tracks[physical_track] = bytify(track);
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}
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return disk;
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}
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