apple2js/js/formats/block.ts

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/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
import { DiskOptions, BlockDisk, ENCODING_BLOCK } from './types';
/**
* Returns a `Disk` object for a block volume with block-ordered data.
* @param options the disk image and options
*/
export default function createBlockDisk(options: DiskOptions): BlockDisk {
const { rawData, readOnly, name } = options;
if (!rawData) {
throw new Error('Requires rawData');
}
const blocks = [];
let offset = 0;
while (offset < rawData.byteLength) {
blocks.push(new Uint8Array(rawData.slice(offset, offset + 0x200)));
offset += 0x200;
}
const disk: BlockDisk = {
encoding: ENCODING_BLOCK,
blocks,
name,
readOnly,
};
return disk;
}