Streamlined volume descriptors

package.json

@@ -48,5 +48,8 @@
 	},
 	"peerDependencies": {
 		"@zenfs/core": "^0.10.0"
+	},
+	"dependencies": {
+		"utilium": "^0.3.4"
 	}
 }

src/IsoFS.ts

@@ -7,7 +7,7 @@ import { NoSyncFile, isWriteable } from '@zenfs/core/file.js';
 import { FileSystem, Readonly, Sync, type FileSystemMetadata } from '@zenfs/core/filesystem.js';
 import { FileType, Stats } from '@zenfs/core/stats.js';
 import { DirectoryRecord } from './DirectoryRecord.js';
-import { PrimaryOrSupplementaryVolumeDescriptor, PrimaryVolumeDescriptor, SupplementaryVolumeDescriptor, VolumeDescriptor, VolumeDescriptorTypeCode } from './VolumeDescriptor.js';
+import { PrimaryOrSupplementaryVolumeDescriptor, PrimaryVolumeDescriptor, SupplementaryVolumeDescriptor, VolumeDescriptor, VolumeDescriptorType } from './VolumeDescriptor.js';
 import { PXEntry, TFEntry, TFFlags } from './entries.js';
 
 /**
@@ -55,13 +55,13 @@ export class IsoFS extends Readonly(Sync(FileSystem)) {
 			const slice = this._data.slice(i);
 			const vd = new VolumeDescriptor(slice);
 			switch (vd.type) {
-				case VolumeDescriptorTypeCode.PrimaryVolumeDescriptor:
+				case VolumeDescriptorType.Primary:
 					candidateVDs.push(new PrimaryVolumeDescriptor(slice));
 					break;
-				case VolumeDescriptorTypeCode.SupplementaryVolumeDescriptor:
+				case VolumeDescriptorType.Supplementary:
 					candidateVDs.push(new SupplementaryVolumeDescriptor(slice));
 					break;
-				case VolumeDescriptorTypeCode.VolumeDescriptorSetTerminator:
+				case VolumeDescriptorType.SetTerminator:
 					vdTerminatorFound = true;
 					break;
 			}
@@ -72,7 +72,7 @@ export class IsoFS extends Readonly(Sync(FileSystem)) {
 		}
 		for (const v of candidateVDs) {
 			// Take an SVD over a PVD.
-			if (!this._pvd || this._pvd.type !== VolumeDescriptorTypeCode.SupplementaryVolumeDescriptor) {
+			if (!this._pvd || this._pvd.type !== VolumeDescriptorType.Supplementary) {
 				this._pvd = v;
 			}
 		}

src/VolumeDescriptor.ts

@@ -2,20 +2,20 @@ import { ErrnoError, Errno } from '@zenfs/core/error.js';
 import { DirectoryRecord, ISODirectoryRecord, JolietDirectoryRecord } from './DirectoryRecord.js';
 import { getASCIIString, getDate, getJolietString } from './utils.js';
 
-export const enum VolumeDescriptorTypeCode {
+export const enum VolumeDescriptorType {
 	BootRecord = 0,
-	PrimaryVolumeDescriptor = 1,
-	SupplementaryVolumeDescriptor = 2,
-	VolumePartitionDescriptor = 3,
-	VolumeDescriptorSetTerminator = 255,
+	Primary = 1,
+	Supplementary = 2,
+	Partition = 3,
+	SetTerminator = 255,
 }
 
 export class VolumeDescriptor {
 	protected _view: DataView;
 	constructor(protected _data: ArrayBuffer) {
 		this._view = new DataView(_data);
 	}
-	public get type(): VolumeDescriptorTypeCode {
+	public get type(): VolumeDescriptorType {
 		return this._view[0];
 	}
 	public get standardIdentifier(): string {
@@ -124,7 +124,7 @@ export abstract class PrimaryOrSupplementaryVolumeDescriptor extends VolumeDescr
 export class PrimaryVolumeDescriptor extends PrimaryOrSupplementaryVolumeDescriptor {
 	constructor(data: ArrayBuffer) {
 		super(data);
-		if (this.type !== VolumeDescriptorTypeCode.PrimaryVolumeDescriptor) {
+		if (this.type !== VolumeDescriptorType.Primary) {
 			throw new ErrnoError(Errno.EIO, `Invalid primary volume descriptor.`);
 		}
 	}
@@ -142,21 +142,21 @@ export class PrimaryVolumeDescriptor extends PrimaryOrSupplementaryVolumeDescrip
 export class SupplementaryVolumeDescriptor extends PrimaryOrSupplementaryVolumeDescriptor {
 	constructor(data: ArrayBuffer) {
 		super(data);
-		if (this.type !== VolumeDescriptorTypeCode.SupplementaryVolumeDescriptor) {
-			throw new ErrnoError(Errno.EIO, `Invalid supplementary volume descriptor.`);
+		if (this.type !== VolumeDescriptorType.Supplementary) {
+			throw new ErrnoError(Errno.EIO, 'Invalid supplementary volume descriptor.');
 		}
-		const escapeSequence = this.escapeSequence();
+		const escapeSequence = this.escapeSequence;
 		const third = escapeSequence[2];
 		// Third character identifies what 'level' of the UCS specification to follow.
 		// We ignore it.
 		if (escapeSequence[0] !== 37 || escapeSequence[1] !== 47 || (third !== 64 && third !== 67 && third !== 69)) {
-			throw new ErrnoError(Errno.EIO, `Unrecognized escape sequence for SupplementaryVolumeDescriptor: ${escapeSequence.toString()}`);
+			throw new ErrnoError(Errno.EIO, 'Unrecognized escape sequence for SupplementaryVolumeDescriptor: ' + escapeSequence.toString());
 		}
 	}
 	public get name() {
 		return 'Joliet';
 	}
-	public escapeSequence(): ArrayBuffer {
+	public get escapeSequence(): ArrayBuffer {
 		return this._data.slice(88, 120);
 	}
 	protected _constructRootDirectoryRecord(data: ArrayBuffer): DirectoryRecord {