apple2js/js/formats/nib.ts

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import { NibbleDisk, DiskOptions, ENCODING_NIBBLE } from './types';
import { memory } from '../types';
/**
* Returns a `Disk` object from raw nibble image data.
* @param options the disk image and options
* @returns A nibblized disk
*/
export default function createDiskFromNibble(options: DiskOptions): NibbleDisk {
const { data, name, side, rawData, volume, readOnly } = options;
const disk: NibbleDisk = {
format: 'nib',
encoding: ENCODING_NIBBLE,
name,
side,
volume: volume || 254,
readOnly: readOnly || false,
tracks: []
};
for (let t = 0; t < 35; t++) {
let track: memory;
if (rawData) {
const off = t * 0x1a00;
track = new Uint8Array(rawData.slice(off, off + 0x1a00));
} else if (data) {
track = data[t][0];
} else {
throw new Error('Requires data or rawData');
}
disk.tracks[t] = track;
}
return disk;
}