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); } }