54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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import DOS from './do';
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import Nibble from './nib';
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import ProDOS from './po';
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export default function _2MG(options) {
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var { rawData } = options;
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var disk;
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var volume = 254;
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// Standard header size is 64 bytes. Make assumptions.
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var prefix = new Uint8Array(rawData.slice(0, 64));
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rawData = rawData.slice(64);
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var flags =
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prefix[0x10] |
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(prefix[0x11] << 8) |
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(prefix[0x12] << 16) |
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(prefix[0x13] << 24);
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var readOnly = (flags & 0x80000000) !== 0;
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if ((flags & 0x10) !== 0) {
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volume = flags & 0xff;
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}
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options = { rawData, readOnly, volume };
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// Check image format.
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// Sure, it's really 64 bits. But only 2 are actually used.
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switch (prefix[0xc]) {
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case 1: // PO
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disk = new ProDOS(options);
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break;
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case 2: // NIB
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disk = new Nibble(options);
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break;
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case 0: // dsk
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default: // Something hinky, assume 'dsk'
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disk = new DOS(options);
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break;
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}
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return disk;
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}
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