TDataView.js

import {
  describe,
  test,
  expect,
  Result
} from './tests.uts'

export class TDataView {
  test() {
    // this.setDv();
    // this.setInt8();
    // this.setFloat32();
    // this.setFloat64();
    // this.setInt16();
    // this.setInt32();
    // this.setUint16();
    // this.setUint32();
    // this.setUint8();
    // this.testMix();
  }
  setConstructor() {
    let buffer = new ArrayBuffer(16);
    let dataview = new DataView(buffer);
    dataview.setInt8(1, 12);
    dataview.setFloat32(1, 34);
    expect(dataview.getInt8(1)).toEqual(66);
    expect(this.numberEquals(34, dataview.getFloat32(1))).toEqual(true);

    buffer = new ArrayBuffer(16);
    let view = new DataView(buffer, 1, 4);
    view.setInt16(1, 42); // 42
    expect(view.getInt16(1)).toEqual(42);
  }

  setInt8() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setInt8(1, 127); // Max signed 8-bit integer
    expect(view.getInt8(1)).toEqual(127);
  }

  setFloat32() {
    console.log('setFloat32', 'start')
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setFloat32(1, Math.PI.toFloat());
    expect(this.numberEquals(3.1415927, view.getFloat32(1).toFloat())).toEqual(true);
  }

  setFloat64() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setFloat64(1, Math.PI);
    expect(this.numberEquals(3.141592653589793, view.getFloat64(1))).toEqual(true);
  }

  setInt16() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setInt16(1, 32767); // Max signed 16-bit integer
    expect(view.getInt16(1)).toEqual(32767);
  }

  setInt32() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setInt32(1, 2147483647); // Max signed 32-bit integer
    expect(this.numberEquals(2147483647, view.getInt32(1))).toEqual(true);
  }

  setUint16() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setUint16(1, 65535); // Max unsigned 16-bit integer
    expect(this.numberEquals(65535, view.getUint16(1))).toEqual(true);
  }

  setUint32() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setUint32(1, 4294967295); // Max unsigned 32-bit integer
    expect(this.numberEquals(4294967295, view.getUint32(1))).toEqual(true);
  }

  setUint8() {
    // Create an ArrayBuffer with a size in bytes
    let buffer = new ArrayBuffer(16);
    let view = new DataView(buffer);
    view.setUint8(1, 255); // Max unsigned 8-bit integer
    expect(this.numberEquals(255, view.getUint8(1))).toEqual(true);
  }

  numberEquals(a: Number, b: Number): Boolean {
    return a == b
  }


  doTestDataViewBigEndian() {
    this.doIterations(false, true);
  }

  doTestDataViewLittleEndian() {
    this.doIterations(true, true);
  }

  doTestTypedArrayBigEndian() {
    this.doIterations(false, false);
  }

  doTestTypedArrayLittleEndian() {
    this.doIterations(true, false);
  }

  doTestDataViewFloats() {
    this.doFloatIterations(true);
  }

  doTestTypedArrayFloats() {
    this.doFloatIterations(false);
  }

  doIterations(littleEndian: boolean, dataView: boolean) {
    var buffer = this.makeBuffer(1000, littleEndian);
    var iterations = 10;
    if (dataView) {
      for (var i = 0; i < iterations; i++)
        this.doOneIterationDV(buffer, littleEndian);
    } else {
      for (var i = 0; i < iterations; i++)
        this.doOneIterationJS(buffer, littleEndian);
    }
  }

  makeBuffer(size: Int, littleEndian: boolean): ArrayBuffer {
    var buffer = new ArrayBuffer(size * 14);
    var view = new DataView(buffer);
    for (var i = 0; i < size; ++i) {
      view.setInt8(i * 14, i);
      view.setUint8(i * 14 + 1, i);
      view.setInt16(i * 14 + 2, i * i, littleEndian);
      view.setUint16(i * 14 + 4, i * i, littleEndian);
      view.setInt32(i * 14 + 6, i * i * i, littleEndian);
      view.setUint32(i * 14 + 10, i * i * i, littleEndian);
    }
    return buffer;
  }

  doOneIterationDV(buffer: ArrayBuffer, littleEndian: boolean) {
    var xor = 0;
    var view = new DataView(buffer);
    for (var i = 0; i < view.byteLength; i += 14) {
      xor ^= view.getInt8(i);
      xor ^= view.getUint8(i + 1);
      xor ^= view.getInt16(i + 2, littleEndian);
      xor ^= view.getUint16(i + 4, littleEndian);
      xor ^= view.getInt32(i + 6, littleEndian);
      xor ^= view.getUint32(i + 10, littleEndian);
    }
    expect(xor).toEqual(0);
  }

  doOneIterationJS(buffer: ArrayBuffer, littleEndian: boolean) {
    var xor = 0;
    if (littleEndian) {
      var reader = new LittleEndian(buffer);
      for (var i = 0; i < buffer.byteLength; i += 14) {
        xor ^= reader.getInt8(i);
        xor ^= reader.getUint8(i + 1);
        xor ^= reader.getInt16(i + 2);
        xor ^= reader.getUint16(i + 4);
        xor ^= reader.getInt32(i + 6);
        xor ^= reader.getUint32(i + 10);
      }
      expect(xor).toEqual(0);
    } else {
      var reader = new BigEndian(buffer);
      for (var i = 0; i < buffer.byteLength; i += 14) {
        xor ^= reader.getInt8(i);
        xor ^= reader.getUint8(i + 1);
        xor ^= reader.getInt16(i + 2);
        xor ^= reader.getUint16(i + 4);
        xor ^= reader.getInt32(i + 6);
        xor ^= reader.getUint32(i + 10);
      }
    }

  }

  doFloatIterations(dataView: boolean) {
    var buffer = makeFloatBuffer(1000);
    var iterations = 10;
    if (dataView) {
      for (var i = 0; i < iterations; i++)
        this.doOneFloatIterationDV(buffer);
    } else {
      for (var i = 0; i < iterations; i++)
        this.doOneFloatIterationJS(buffer);
    }
  }

  makeFloatBuffer(size: Int): ArrayBuffer {
    var buffer = new ArrayBuffer(size * 16);
    var view = new DataView(buffer);
    for (var i = 0; i < size; i++) {
      view.setFloat64(i * 16, Math.log10(i + 1));
      view.setFloat32(i * 16 + 8, Math.sqrt(i));
      view.setFloat32(i * 16 + 12, Math.cos(i));
    }
    return buffer;
  }

  doOneFloatIterationDV(buffer: ArrayBuffer) {
    var sum = 0;
    var view = new DataView(buffer);
    for (var i = 0; i < view.byteLength; i += 16) {
      sum += view.getFloat64(i);
      sum += view.getFloat32(i + 8);
      sum += view.getFloat32(i + 12);
    }
     expect(sum).toEqual(23634.413356150446);
  }

  doOneFloatIterationJS(buffer: ArrayBuffer) {
    var sum = 0;
    var float32array = new Float32Array(buffer);
    var float64array = new Float64Array(buffer);
    for (var i = 0; i < buffer.byteLength; i += 16) {
      sum += float64array[i / 8];
      sum += float32array[i / 4 + 2];
      sum += float32array[i / 4 + 3];
    }
  }
}
class BigEndian {
  private uint8View_: Uint8Array;
  private int8View_: Int8Array;

  constructor(buffer: ArrayBuffer, ) {
    const offset = 0;
    this.uint8View_ = new Uint8Array(buffer, offset);
    this.int8View_ = new Int8Array(buffer, offset);
  }

  getInt8(byteOffset: number): number {
    return this.int8View_[byteOffset];
  }

  getUint8(byteOffset: number): number {
    return this.uint8View_[byteOffset];
  }

  getInt16(byteOffset: number): number {
    return this.uint8View_[byteOffset + 1] | (this.int8View_[byteOffset] << 8);
  }

  getUint16(byteOffset: number): number {
    return this.uint8View_[byteOffset + 1] | (this.uint8View_[byteOffset] << 8);
  }

  getInt32(byteOffset: number): number {
    return (
      this.uint8View_[byteOffset + 3] |
      (this.uint8View_[byteOffset + 2] << 8) |
      (this.uint8View_[byteOffset + 1] << 16) |
      (this.int8View_[byteOffset] << 24)
    );
  }

  getUint32(byteOffset: number): number {
    return (
      this.uint8View_[byteOffset + 3] +
      (this.uint8View_[byteOffset + 2] << 8) +
      (this.uint8View_[byteOffset + 1] << 16) +
      this.uint8View_[byteOffset] * (1 << 24)
    );
  }
}

class LittleEndian {
  private uint8View_: Uint8Array;
  private int8View_: Int8Array;

  constructor(buffer: ArrayBuffer) {
    const offset = 0;
    this.uint8View_ = new Uint8Array(buffer, offset);
    this.int8View_ = new Int8Array(buffer, offset);
  }

  getInt8(byteOffset: number): number {
    return this.int8View_[byteOffset];
  }

  getUint8(byteOffset: number): number {
    return this.uint8View_[byteOffset];
  }

  getInt16(byteOffset: number): number {
    return this.uint8View_[byteOffset] | (this.int8View_[byteOffset + 1] << 8);
  }

  getUint16(byteOffset: number): number {
    return this.uint8View_[byteOffset] | (this.uint8View_[byteOffset + 1] << 8);
  }

  getInt32(byteOffset: number): number {
    return (
      this.uint8View_[byteOffset] |
      (this.uint8View_[byteOffset + 1] << 8) |
      (this.uint8View_[byteOffset + 2] << 16) |
      (this.int8View_[byteOffset + 3] << 24)
    );
  }

  getUint32(byteOffset: number): number {
    return (
      this.uint8View_[byteOffset] +
      (this.uint8View_[byteOffset + 1] << 8) +
      (this.uint8View_[byteOffset + 2] << 16) +
      this.uint8View_[byteOffset + 3] * (1 << 24)
    );
  }
}