LukaJCB / ts-mls / 19395039460

export function copyToBuffer(b: Uint8Array): ArrayBuffer {

export function bytesToArrayBuffer(b: Uint8Array): ArrayBuffer {

  if (b.buffer instanceof ArrayBuffer) {

    if (b.byteOffset === 0 && b.byteLength === b.buffer.byteLength) {

      return b.buffer

    }

    return b.buffer.slice(b.byteOffset, b.byteOffset + b.byteLength)

}

export function toBufferSource(b: Uint8Array): BufferSource {

export function bytesToBase64(bytes: Uint8Array): string {

  if (typeof Buffer !== "undefined") {

    return Buffer.from(bytes).toString("base64")

  } else {

    let binary = ""

    bytes.forEach((b) => (binary += String.fromCharCode(b)))

    return globalThis.btoa(binary)

  }

}

export function base64ToBytes(base64: string): Uint8Array {

  if (typeof Buffer !== "undefined") {

    return Uint8Array.from(Buffer.from(base64, "base64"))

  } else {

    const binary = globalThis.atob(base64)

    const bytes = new Uint8Array(binary.length)

    for (let i = 0; i < binary.length; i++) {

      bytes[i] = binary.charCodeAt(i)

    }

    return bytes

  }

}

export function concatUint8Arrays(a: Uint8Array, b: Uint8Array): Uint8Array {

  const result = new Uint8Array(a.length + b.length)

  result.set(a, 0)

  result.set(b, a.length)

  return result

}

export function concat3Uint8Arrays(a: Uint8Array, b: Uint8Array, c: Uint8Array): Uint8Array {

  const result = new Uint8Array(a.length + b.length + c.length)

  result.set(a, 0)

  result.set(b, a.length)

  result.set(c, a.length + b.length)

  return result

}