47 lines
1.3 KiB
TypeScript
47 lines
1.3 KiB
TypeScript
import type { ProDOSVolume } from '.';
|
|
import { BitMap } from './bit_map';
|
|
import { STORAGE_TYPES } from './constants';
|
|
import { FileEntry } from './file_entry';
|
|
|
|
export class SeedlingFile {
|
|
blocks: Uint8Array[];
|
|
bitMap: BitMap;
|
|
|
|
constructor(volume: ProDOSVolume, private fileEntry: FileEntry) {
|
|
this.blocks = volume.blocks();
|
|
this.bitMap = volume.bitMap();
|
|
}
|
|
|
|
getBlockPointers() {
|
|
const pointers = [this.fileEntry.keyPointer];
|
|
return pointers;
|
|
}
|
|
|
|
read() {
|
|
const seedlingBlock = this.blocks[this.fileEntry.keyPointer];
|
|
const data = new Uint8Array(this.fileEntry.eof);
|
|
data.set(seedlingBlock.slice(0, this.fileEntry.eof));
|
|
return data;
|
|
}
|
|
|
|
write(data: Uint8Array) {
|
|
if (this.fileEntry.keyPointer) {
|
|
this.delete();
|
|
}
|
|
this.fileEntry.storageType = STORAGE_TYPES.SEEDLING;
|
|
this.fileEntry.keyPointer = this.bitMap.allocBlock();
|
|
this.fileEntry.eof = data.byteLength;
|
|
const seedlingBlock = this.blocks[this.fileEntry.keyPointer];
|
|
seedlingBlock.set(data);
|
|
this.fileEntry.write();
|
|
}
|
|
|
|
delete() {
|
|
const pointers = this.getBlockPointers();
|
|
for (let idx = 0; idx < pointers.length; idx++) {
|
|
this.bitMap.freeBlock(pointers[idx]);
|
|
}
|
|
}
|
|
}
|
|
|