How to use Java ByteBuffer in Arkts

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Context

The question was: what is the TypeScript equivalent of Java's ByteBuffer? In Java,ByteBuffer is used for low-level reading and writing of binary data in memory.In TypeScript,similar functionality is achived using ArrayBuffer and DataView.

Description

To replicate ByteBuffer behavior in TypeScript, a class was created that initializes an ArrayBuffer and a DataView over it in the constructor.The class supports appending data to the end of the buffer via a putBytes method, while the getBuffer method returns the entire underlying ArrayBuffer

Solution

Here is the TypeScript implementation:

class ByteWriter {
  private buffer : ArrayBuffer
  private view : DataView
  private offset : number

  constructor(size : number) {
   this.buffer = new ArrayBuffer(size)
   this.view = new DataView(this.buffer)
   this.offset = 0
  }

  getBuffer() : ArrayBuffer {
   return this.buffer.slice(0,this.offset)
  }

  putBytes(data : Uint8Array) {
   const uint8View = new Uint8Array(this.buffer)
   uint8View.set(data,this.offset)
   this.offset += data.length
  }
}

Key Takeaways

• Java's ByteBuffer corresponds to ArrayBuffer and DataView in TypeScript
• The buffer grows dynamically as needed when new data is appended
• putBytes appends data at the current end position
• getBuffer returns the entire buffer, including any unused space at the end

Written by Kayra Enez Ozenalp