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@ -13,11 +13,22 @@ const floppyDisk = computed(() => {
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<section v-if="floppyDisk.bootSectorInfo">
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<h3>Boot Sector</h3>
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<pre>{{ floppyDisk.bootSectorInfo }}</pre>
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<h3>Root Dir</h3>
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<h3>Directory Entries</h3>
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<pre>{{ floppyDisk.rootDirEntries }}</pre>
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<h3>Data</h3>
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<pre>Offset: {{ floppyDisk.dataOffset }}</pre>
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</section>
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</template>
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<style scoped></style>
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<style scoped>
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pre {
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width: 100%;
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padding: 0.5em 1em 10em;
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box-sizing: border-box;
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overflow: scroll;
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min-height: 10rem;
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height: 20rem;
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max-height: 20rem;
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background: rgba(255, 255, 255, 0.15);
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color: #c0c0c0;
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border: 1px solid rgba(255, 255, 255, 0.3);
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}
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</style>
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@ -48,6 +48,7 @@ export interface IStandardDirEntry {
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firstCluster: number
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clusterChain: number[]
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data: ArrayBuffer
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subDirEntries: TDirEntry[]
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}
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export interface ILongFileNameDirEntry {
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@ -62,17 +63,17 @@ export interface IUnusedDirEntry {
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type: 'unused-entry'
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}
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export type DirEntry = IStandardDirEntry | ILongFileNameDirEntry | IFinalDirEntry | IUnusedDirEntry
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export type TDirEntry = IStandardDirEntry | ILongFileNameDirEntry | IFinalDirEntry | IUnusedDirEntry
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export class FloppyDisk {
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private readonly _buffer = new ArrayBuffer(0)
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buffer = new ArrayBuffer(0)
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private _bootSector: IBootSectorInfo | null = null
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constructor(buffer: ArrayBuffer) {
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this._buffer = buffer
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this.buffer = buffer
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}
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private _rootDirEntries: DirEntry[] | null = null
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private _rootDirEntries: TDirEntry[] | null = null
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get rootDirEntries() {
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if (this._rootDirEntries === null) {
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@ -81,59 +82,23 @@ export class FloppyDisk {
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const end = offset + size
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if (this._buffer.byteLength >= end) {
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if (this.buffer.byteLength >= end) {
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this._rootDirEntries = decodeDirectoryEntries(
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new DataView(this._buffer, this.rootDirOffset, this.rootDirSize),
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new DataView(this.buffer, this.rootDirOffset, this.rootDirSize),
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this,
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)
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}
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if (this._rootDirEntries === null) {
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return null
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}
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for (const entry of this._rootDirEntries) {
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if (entry.type === 'standard-entry' && (entry.size > 0 || entry.attributes.directory)) {
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entry.clusterChain = this.clusterChain(entry.firstCluster)
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const dataSize = entry.clusterChain.length * this.bytesPerCluster
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if (dataSize === 0) {
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continue
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}
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const data = new Uint8Array(dataSize)
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for (let i = 0; i < entry.clusterChain.length; i++) {
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const offset = (entry.clusterChain[i] - 2) * this.bytesPerCluster
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const view = new Uint8Array(
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this._buffer,
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this.dataOffset + offset,
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this.bytesPerCluster,
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)
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data.set(view, i * this.bytesPerCluster)
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}
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console.log(
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entry.name.trim() + (entry.extension.trim() ? '.' + entry.extension.trim() : ''),
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)
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entry.data = data.slice(0, entry.size > 0 ? entry.size : data.byteLength)
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if (
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!entry.attributes.directory &&
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(['BAT', 'TXT', 'BAS'].includes(entry.extension) || entry.name.trim() === 'LICENSE')
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) {
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const decoder = new TextDecoder()
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console.log(decoder.decode(entry.data))
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}
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}
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}
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}
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return this._rootDirEntries
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}
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get bootSectorInfo() {
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if (this._buffer.byteLength < 512) {
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if (this.buffer.byteLength < 512) {
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return null
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}
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return (this._bootSector =
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this._bootSector ?? decodeBootSector(new DataView(this._buffer, 0, 512)))
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this._bootSector ?? decodeBootSector(new DataView(this.buffer, 0, 512)))
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}
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get tableSize() {
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@ -198,7 +163,7 @@ export class FloppyDisk {
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const entityOffset = tableOffset % this.bytesPerSector
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const table = new DataView(
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this._buffer,
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this.buffer,
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tableSector * this.bytesPerSector,
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2 * this.bytesPerSector,
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)
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@ -297,7 +262,7 @@ function decodeBootSector(data: DataView): IBootSectorInfo | null {
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}
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}
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function decodeDirectoryEntry(data: DataView): DirEntry | null {
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function decodeDirectoryEntry(data: DataView, fd: FloppyDisk): TDirEntry | null {
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if (data.byteLength < 32) {
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return null
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}
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@ -313,10 +278,10 @@ function decodeDirectoryEntry(data: DataView): DirEntry | null {
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return { type: 'long-filename-entry' }
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} else {
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const asciiDecoder = new TextDecoder('ascii')
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const name = asciiDecoder.decode(data.buffer.slice(data.byteOffset, data.byteOffset + 8))
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const extension = asciiDecoder.decode(
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data.buffer.slice(data.byteOffset + 8, data.byteOffset + 11),
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)
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const name = asciiDecoder.decode(data.buffer.slice(data.byteOffset, data.byteOffset + 8)).trim()
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const extension = asciiDecoder
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.decode(data.buffer.slice(data.byteOffset + 8, data.byteOffset + 11))
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.trim()
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const attributeByte = data.getUint8(11)
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@ -332,28 +297,57 @@ function decodeDirectoryEntry(data: DataView): DirEntry | null {
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const firstCluster = (data.getUint16(20, true) << 16) | data.getUint16(26, true)
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const size = data.getUint32(28, true)
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return {
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const entry: IStandardDirEntry = {
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type: 'standard-entry',
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name,
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extension,
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attributes,
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firstCluster,
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clusterChain: [],
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data: new ArrayBuffer(0),
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data: new Uint8Array(0),
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size,
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subDirEntries: [],
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}
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if (
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entry.size > 0 ||
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(entry.attributes.directory && entry.name !== '.' && entry.name !== '..')
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) {
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entry.clusterChain = fd.clusterChain(entry.firstCluster)
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const dataSize = entry.clusterChain.length * fd.bytesPerCluster
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if (dataSize !== 0) {
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const entryData = new Uint8Array(dataSize)
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for (let i = 0; i < entry.clusterChain.length; i++) {
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const offset = (entry.clusterChain[i] - 2) * fd.bytesPerCluster
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const view = new Uint8Array(fd.buffer, fd.dataOffset + offset, fd.bytesPerCluster)
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entryData.set(view, i * fd.bytesPerCluster)
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}
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const resizedData = entryData.slice(0, entry.size > 0 ? entry.size : entryData.byteLength)
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if (entry.attributes.directory) {
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entry.subDirEntries = decodeDirectoryEntries(new DataView(resizedData.buffer), fd)
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} else {
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entry.data = resizedData
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}
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}
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}
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return entry
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}
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}
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function decodeDirectoryEntries(data: DataView): DirEntry[] {
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const entries: DirEntry[] = []
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function decodeDirectoryEntries(data: DataView, fd: FloppyDisk): TDirEntry[] {
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const entries: TDirEntry[] = []
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let offset = 0
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while (data.byteLength - offset >= 32) {
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const dirData = new DataView(data.buffer, data.byteOffset + offset, 32)
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offset += 32
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const entry = decodeDirectoryEntry(dirData)
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const entry = decodeDirectoryEntry(dirData, fd)
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if (entry === null) {
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break
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}
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