107 lines
3.3 KiB
TypeScript
107 lines
3.3 KiB
TypeScript
import {
|
|
dateToUint32,
|
|
readFileName,
|
|
writeFileName,
|
|
uint32ToDate,
|
|
} from './utils';
|
|
import { FileEntry, readEntries, writeEntries } from './file_entry';
|
|
import { STORAGE_TYPES, ACCESS_TYPES } from './constants';
|
|
import { byte, word } from 'js/types';
|
|
import { ProDOSVolume } from '.';
|
|
|
|
const VDH_BLOCK = 2;
|
|
const VDH_OFFSETS = {
|
|
PREV: 0x00,
|
|
NEXT: 0x02,
|
|
STORAGE_TYPE: 0x04,
|
|
NAME_LENGTH: 0x04,
|
|
VOLUME_NAME: 0x05,
|
|
RESERVED_1: 0x14,
|
|
CASE_BITS: 0x1a,
|
|
CREATION: 0x1c,
|
|
VERSION: 0x20,
|
|
MIN_VERSION: 0x21,
|
|
ACCESS: 0x22,
|
|
ENTRY_LENGTH: 0x23,
|
|
ENTRIES_PER_BLOCK: 0x24,
|
|
FILE_COUNT: 0x25,
|
|
BIT_MAP_POINTER: 0x27,
|
|
TOTAL_BLOCKS: 0x29,
|
|
} as const;
|
|
|
|
export class VDH {
|
|
private blocks: Uint8Array[];
|
|
|
|
prev: word = 0;
|
|
next: word = 0;
|
|
storageType: byte = STORAGE_TYPES.VDH_HEADER;
|
|
name: string = '';
|
|
creation: Date = new Date();
|
|
access: byte = ACCESS_TYPES.ALL;
|
|
entryLength = 0x27;
|
|
entriesPerBlock = 23;
|
|
fileCount = 0;
|
|
bitMapPointer: word = 0;
|
|
totalBlocks: word = 0;
|
|
entries: FileEntry[] = [];
|
|
|
|
constructor(private volume: ProDOSVolume) {
|
|
this.blocks = this.volume.blocks();
|
|
}
|
|
|
|
read() {
|
|
const block = new DataView(this.blocks[VDH_BLOCK].buffer);
|
|
|
|
this.next = block.getUint16(VDH_OFFSETS.NEXT, true);
|
|
this.storageType = block.getUint8(VDH_OFFSETS.STORAGE_TYPE) >> 4;
|
|
const nameLength = block.getUint8(VDH_OFFSETS.NAME_LENGTH) & 0xf;
|
|
const caseBits = block.getUint8(VDH_OFFSETS.CASE_BITS);
|
|
this.name = readFileName(
|
|
block,
|
|
VDH_OFFSETS.VOLUME_NAME,
|
|
nameLength,
|
|
caseBits
|
|
);
|
|
this.creation = uint32ToDate(
|
|
block.getUint32(VDH_OFFSETS.CREATION, true)
|
|
);
|
|
this.access = block.getUint8(VDH_OFFSETS.ACCESS);
|
|
this.entryLength = block.getUint8(VDH_OFFSETS.ENTRY_LENGTH);
|
|
this.entriesPerBlock = block.getUint8(VDH_OFFSETS.ENTRIES_PER_BLOCK);
|
|
this.fileCount = block.getUint16(VDH_OFFSETS.FILE_COUNT, true);
|
|
this.bitMapPointer = block.getUint16(VDH_OFFSETS.BIT_MAP_POINTER, true);
|
|
this.totalBlocks = block.getUint16(VDH_OFFSETS.TOTAL_BLOCKS, true);
|
|
|
|
this.entries = readEntries(this.volume, block, this);
|
|
}
|
|
|
|
write() {
|
|
const block = new DataView(this.blocks[VDH_BLOCK].buffer);
|
|
|
|
const nameLength = this.name.length & 0x0f;
|
|
block.setUint8(
|
|
VDH_OFFSETS.STORAGE_TYPE,
|
|
(this.storageType << 4) & nameLength
|
|
);
|
|
const caseBits = writeFileName(
|
|
block,
|
|
VDH_OFFSETS.VOLUME_NAME,
|
|
this.name
|
|
);
|
|
block.setUint32(
|
|
VDH_OFFSETS.CREATION,
|
|
dateToUint32(this.creation),
|
|
true
|
|
);
|
|
block.setUint16(VDH_OFFSETS.CASE_BITS, caseBits);
|
|
block.setUint8(VDH_OFFSETS.ACCESS, this.access);
|
|
block.setUint8(VDH_OFFSETS.ENTRY_LENGTH, this.entryLength);
|
|
block.setUint8(VDH_OFFSETS.ENTRIES_PER_BLOCK, this.entriesPerBlock);
|
|
block.setUint16(VDH_OFFSETS.FILE_COUNT, this.fileCount, true);
|
|
block.setUint16(VDH_OFFSETS.BIT_MAP_POINTER, this.bitMapPointer, true);
|
|
block.setUint16(VDH_OFFSETS.TOTAL_BLOCKS, this.totalBlocks, true);
|
|
|
|
writeEntries(this.volume, block, this);
|
|
}
|
|
}
|