mirror of
https://github.com/whscullin/apple2js.git
synced 2024-01-12 14:14:38 +00:00
94 lines
3.7 KiB
TypeScript
94 lines
3.7 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 '.';
|
|
import { VDH } from './vdh';
|
|
|
|
export const DIRECTORY_OFFSETS = {
|
|
PREV: 0x00,
|
|
NEXT: 0x02,
|
|
STORAGE_TYPE: 0x04,
|
|
NAME_LENGTH: 0x04,
|
|
DIRECTORY_NAME: 0x05,
|
|
RESERVED_1: 0x14,
|
|
CREATION: 0x1C,
|
|
CASE_BITS: 0x20,
|
|
VERSION: 0x20,
|
|
MIN_VERSION: 0x21,
|
|
ACCESS: 0x22,
|
|
ENTRY_LENGTH: 0x23,
|
|
ENTRIES_PER_BLOCK: 0x24,
|
|
FILE_COUNT: 0x25,
|
|
PARENT: 0x27,
|
|
PARENT_ENTRY_NUMBER: 0x29,
|
|
PARENT_ENTRY_LENGTH: 0x2A
|
|
} as const;
|
|
|
|
export class Directory {
|
|
blocks: Uint8Array[];
|
|
vdh: VDH;
|
|
|
|
prev: word = 0;
|
|
next: word = 0;
|
|
storageType: byte = STORAGE_TYPES.DIRECTORY;
|
|
name: string = 'Untitled';
|
|
creation: Date = new Date();
|
|
access: byte = ACCESS_TYPES.ALL;
|
|
entryLength = 0x27;
|
|
entriesPerBlock: byte = 23;
|
|
fileCount = 0;
|
|
parent: word = 0;
|
|
parentEntryLength: byte = 0;
|
|
parentEntryNumber: byte = 0;
|
|
entries: FileEntry[] = [];
|
|
|
|
constructor(private volume: ProDOSVolume, private fileEntry: FileEntry) {
|
|
this.blocks = this.volume.blocks();
|
|
this.vdh = this.volume.vdh();
|
|
}
|
|
|
|
read(fileEntry?: FileEntry) {
|
|
this.fileEntry = fileEntry ?? this.fileEntry;
|
|
|
|
const block = new DataView(this.blocks[this.fileEntry.keyPointer].buffer);
|
|
|
|
this.prev = block.getUint16(DIRECTORY_OFFSETS.PREV, true);
|
|
this.next = block.getUint16(DIRECTORY_OFFSETS.NEXT, true);
|
|
this.storageType = block.getUint8(DIRECTORY_OFFSETS.STORAGE_TYPE) >> 4;
|
|
const nameLength = block.getUint8(DIRECTORY_OFFSETS.NAME_LENGTH) & 0xF;
|
|
const caseBits = block.getUint8(DIRECTORY_OFFSETS.CASE_BITS);
|
|
this.name = readFileName(block, DIRECTORY_OFFSETS.DIRECTORY_NAME, nameLength, caseBits);
|
|
this.creation = uint32ToDate(block.getUint32(DIRECTORY_OFFSETS.CREATION, true));
|
|
this.access = block.getUint8(DIRECTORY_OFFSETS.ACCESS);
|
|
this.entryLength = block.getUint8(DIRECTORY_OFFSETS.ENTRY_LENGTH);
|
|
this.entriesPerBlock = block.getUint8(DIRECTORY_OFFSETS.ENTRIES_PER_BLOCK);
|
|
this.fileCount = block.getUint16(DIRECTORY_OFFSETS.FILE_COUNT, true);
|
|
this.parent = block.getUint16(DIRECTORY_OFFSETS.PARENT, true);
|
|
this.parentEntryNumber = block.getUint8(DIRECTORY_OFFSETS.PARENT_ENTRY_NUMBER);
|
|
this.parentEntryLength = block.getUint8(DIRECTORY_OFFSETS.PARENT_ENTRY_LENGTH);
|
|
|
|
this.entries = readEntries(this.volume, block, this);
|
|
}
|
|
|
|
write() {
|
|
const block = new DataView(this.blocks[this.fileEntry.keyPointer].buffer);
|
|
|
|
const nameLength = this.name.length & 0x0f;
|
|
block.setUint8(DIRECTORY_OFFSETS.STORAGE_TYPE, this.storageType << 4 & nameLength);
|
|
const caseBits = writeFileName(block, DIRECTORY_OFFSETS.DIRECTORY_NAME, this.name);
|
|
block.setUint32(DIRECTORY_OFFSETS.CREATION, dateToUint32(this.creation), true);
|
|
block.setUint16(DIRECTORY_OFFSETS.CASE_BITS, caseBits);
|
|
block.setUint8(DIRECTORY_OFFSETS.ACCESS, this.access);
|
|
block.setUint8(DIRECTORY_OFFSETS.ENTRY_LENGTH, this.entryLength);
|
|
block.setUint8(DIRECTORY_OFFSETS.ENTRIES_PER_BLOCK, this.entriesPerBlock);
|
|
block.setUint16(DIRECTORY_OFFSETS.FILE_COUNT, this.fileCount, true);
|
|
block.setUint16(DIRECTORY_OFFSETS.PARENT, this.parent, true);
|
|
block.setUint8(DIRECTORY_OFFSETS.PARENT_ENTRY_NUMBER, this.parentEntryNumber);
|
|
block.setUint8(DIRECTORY_OFFSETS.PARENT_ENTRY_LENGTH, this.parentEntryLength);
|
|
|
|
writeEntries(this.volume, block, this.vdh);
|
|
}
|
|
}
|