feat: 🎸 add .subarray() method

src/Reader.ts

@@ -45,6 +45,13 @@ export class Reader implements IReader, IReaderResettable {
     return bin;
   }
 
+  public subarray(start: number = 0, end?: number): Uint8Array {
+    const x = this.x;
+    const actualStart = x + start;
+    const actualEnd = typeof end === 'number' ? x + end : this.end;
+    return this.uint8.subarray(actualStart, actualEnd);
+  }
+
   /**
    * Creates a new {@link Reader} that references the same underlying memory
    * buffer. But with independent cursor and end.

src/StreamingReader.ts

@@ -95,6 +95,13 @@ export class StreamingReader implements IReader, IReaderResettable {
     return bin;
   }
 
+  public subarray(start: number = 0, end?: number): Uint8Array {
+    const x = this.x;
+    const actualStart = x + start;
+    const actualEnd = typeof end === 'number' ? x + end : this.size() + x - start;
+    return this.uint8.subarray(actualStart, actualEnd);
+  }
+
   /**
    * Creates a new {@link Reader} that references the same underlying memory
    * buffer. But with independent cursor and end.

src/types.ts

@@ -91,6 +91,8 @@ export interface IReaderBase {
    */
   cut(size?: number): IReaderBase;
 
+  subarray(start?: number, end?: number): Uint8Array;
+
   /** Get current byte value without advancing the cursor. */
   peek(): number;