feat: add filepicker package

packages/filepicker/src/Chunker/ByteChunker.ts

@@ -0,0 +1,35 @@
+import { OnChunkCallback } from '../types'
+
+export class ByteChunker {
+  public loggingEnabled = false
+  private bytes = new Uint8Array()
+  private index = 1
+
+  constructor(private minimumChunkSize: number, private onChunk: OnChunkCallback) {}
+
+  private log(...args: any[]): void {
+    if (!this.loggingEnabled) {
+      return
+    }
+    // eslint-disable-next-line no-console
+    console.log(args)
+  }
+
+  public async addBytes(bytes: Uint8Array, isLast: boolean): Promise<void> {
+    this.bytes = new Uint8Array([...this.bytes, ...bytes])
+
+    this.log(`Chunker adding ${bytes.length}, total size ${this.bytes.length}`)
+
+    if (this.bytes.length >= this.minimumChunkSize || isLast) {
+      await this.popBytes(isLast)
+    }
+  }
+
+  private async popBytes(isLast: boolean): Promise<void> {
+    const maxIndex = Math.max(this.minimumChunkSize, this.bytes.length)
+    const chunk = this.bytes.slice(0, maxIndex)
+    this.bytes = new Uint8Array([...this.bytes.slice(maxIndex)])
+    this.log(`Chunker popping ${chunk.length}, total size in queue ${this.bytes.length}`)
+    await this.onChunk(chunk, this.index++, isLast)
+  }
+}