apple2js/js/formats/do.ts
2021-12-21 12:35:26 -08:00

44 lines
1.4 KiB
TypeScript

import { explodeSector16, DO } from './format_utils';
import { bytify } from '../util';
import { byte } from '../types';
import { NibbleDisk, DiskOptions, ENCODING_NIBBLE } from './types';
/**
* Returns a `Disk` object from DOS-ordered image data.
* @param options the disk image and options
* @returns A nibblized disk
*/
export default function createDiskFromDOS(options: DiskOptions): NibbleDisk {
const { data, name, side, rawData, volume, readOnly } = options;
const disk: NibbleDisk = {
format: 'dsk',
encoding: ENCODING_NIBBLE,
name,
side,
volume,
readOnly,
tracks: [],
};
for (let t = 0; t < 35; t++) {
let track: byte[] = [];
for (let physical_sector = 0; physical_sector < 16; physical_sector++) {
const dos_sector = DO[physical_sector];
let sector: Uint8Array;
if (rawData) {
const off = (16 * t + dos_sector) * 256;
sector = new Uint8Array(rawData.slice(off, off + 256));
} else if (data) {
sector = new Uint8Array(data[t][dos_sector]);
} else {
throw new Error('Requires data or rawData');
}
track = track.concat(
explodeSector16(volume, t, physical_sector, sector)
);
}
disk.tracks[t] = bytify(track);
}
return disk;
}