How to use the restructure.uint32 function in restructure

'opbd', 'prop', 'trak', 'Zapf', 'Silf', 'Glat', 'Gloc', 'Feat', 'Sill'
];

let WOFF2DirectoryEntry = new r.Struct({
  flags: r.uint8,
  customTag: new r.Optional(new r.String(4), t => (t.flags & 0x3f) === 0x3f),
  tag: t => t.customTag || knownTags[t.flags & 0x3f],// || (() => { throw new Error(`Bad tag: ${flags & 0x3f}`); })(); },
  length: Base128,
  transformVersion: t => (t.flags >>> 6) & 0x03,
  transformed: t => (t.tag === 'glyf' || t.tag === 'loca') ? t.transformVersion === 0 : t.transformVersion !== 0,
  transformLength: new r.Optional(Base128, t => t.transformed)
});

let WOFF2Directory = new r.Struct({
  tag: new r.String(4), // should be 'wOF2'
  flavor: r.uint32,
  length: r.uint32,
  numTables: r.uint16,
  reserved: new r.Reserved(r.uint16),
  totalSfntSize: r.uint32,
  totalCompressedSize: r.uint32,
  majorVersion: r.uint16,
  minorVersion: r.uint16,
  metaOffset: r.uint32,
  metaLength: r.uint32,
  metaOrigLength: r.uint32,
  privOffset: r.uint32,
  privLength: r.uint32,
  tables: new r.Array(WOFF2DirectoryEntry, 'numTables')
});

WOFF2Directory.process = function() {

return new r.DecodeStream(this._buf.decode(stream, parent));
  }
}

// This struct represents the entire glyf table
let GlyfTable = new r.Struct({
  version: r.uint32,
  numGlyphs: r.uint16,
  indexFormat: r.uint16,
  nContourStreamSize: r.uint32,
  nPointsStreamSize: r.uint32,
  flagStreamSize: r.uint32,
  glyphStreamSize: r.uint32,
  compositeStreamSize: r.uint32,
  bboxStreamSize: r.uint32,
  instructionStreamSize: r.uint32,
  nContours: new Substream('nContourStreamSize'),
  nPoints: new Substream('nPointsStreamSize'),
  flags: new Substream('flagStreamSize'),
  glyphs: new Substream('glyphStreamSize'),
  composites: new Substream('compositeStreamSize'),
  bboxes: new Substream('bboxStreamSize'),
  instructions: new Substream('instructionStreamSize')
});

const WORD_CODE = 253;
const ONE_MORE_BYTE_CODE2 = 254;
const ONE_MORE_BYTE_CODE1 = 255;
const LOWEST_U_CODE = 253;

function read255UInt16(stream) {
  let code = stream.readUInt8();

import r from 'restructure';

// font header
export default new r.Struct({
  version:            r.int32,                   // 0x00010000 (version 1.0)
  revision:           r.int32,                   // set by font manufacturer
  checkSumAdjustment: r.uint32,
  magicNumber:        r.uint32,                  // set to 0x5F0F3CF5
  flags:              r.uint16,
  unitsPerEm:         r.uint16,                  // range from 64 to 16384
  created:            new r.Array(r.int32, 2),
  modified:           new r.Array(r.int32, 2),
  xMin:               r.int16,                   // for all glyph bounding boxes
  yMin:               r.int16,                   // for all glyph bounding boxes
  xMax:               r.int16,                   // for all glyph bounding boxes
  yMax:               r.int16,                   // for all glyph bounding boxes
  macStyle:           new r.Bitfield(r.uint16, [
    'bold', 'italic', 'underline', 'outline',
    'shadow', 'condensed', 'extended'
  ]),
  lowestRecPPEM:      r.uint16,                  // smallest readable size in pixels
  fontDirectionHint:  r.int16,
  indexToLocFormat:   r.int16,                   // 0 for short offsets, 1 for long

let KernTable = new r.VersionedStruct('version', {
  0: { // Microsoft uses this format
    subVersion: r.uint16,  // Microsoft has an extra sub-table version number
    length:     r.uint16,  // Length of the subtable, in bytes
    format:     r.uint8,   // Format of subtable
    coverage:   new r.Bitfield(r.uint8, [
      'horizontal',    // 1 if table has horizontal data, 0 if vertical
      'minimum',       // If set to 1, the table has minimum values. If set to 0, the table has kerning values.
      'crossStream',   // If set to 1, kerning is perpendicular to the flow of the text
      'override'      // If set to 1 the value in this table replaces the accumulated value
    ]),
    subtable:   KernSubtable,
    padding: new r.Reserved(r.uint8, t => t.length - t._currentOffset)
  },
  1: { // Apple uses this format
    length:     r.uint32,
    coverage:   new r.Bitfield(r.uint8, [
      null, null, null, null, null,
      'variation',     // Set if table has variation kerning values
      'crossStream',   // Set if table has cross-stream kerning values
      'vertical'      // Set if table has vertical kerning values
    ]),
    format:     r.uint8,
    tupleIndex: r.uint16,
    subtable:   KernSubtable,
    padding: new r.Reserved(r.uint8, t => t.length - t._currentOffset)
  }
});

export default new r.VersionedStruct(r.uint16, {
  0: { // Microsoft Version
    nTables:    r.uint16,

8: { // mixed 16-bit and 32-bit coverage
    reserved: new r.Reserved(r.uint16),
    length:   r.uint32,
    language: r.uint16,
    is32:     new r.LazyArray(r.uint8, 8192),
    nGroups:  r.uint32,
    groups:   new r.LazyArray(CmapGroup, 'nGroups')
  },

  10: { // Trimmed Array
    reserved:       new r.Reserved(r.uint16),
    length:         r.uint32,
    language:       r.uint32,
    firstCode:      r.uint32,
    entryCount:     r.uint32,
    glyphIndices:   new r.LazyArray(r.uint16, 'numChars')
  },

  12: { // Segmented coverage
    reserved: new r.Reserved(r.uint16),
    length:   r.uint32,
    language: r.uint32,
    nGroups:  r.uint32,
    groups:   new r.LazyArray(CmapGroup, 'nGroups')
  },

  13: { // Many-to-one range mappings (same as 12 except for group.startGlyphID)
    reserved: new r.Reserved(r.uint16),
    length:   r.uint32,
    language: r.uint32,
    nGroups:  r.uint32,

constructor(length) {
    this.length = length;
    this._buf = new r.Buffer(length);
  }

  decode(stream, parent) {
    return new r.DecodeStream(this._buf.decode(stream, parent));
  }
}

// This struct represents the entire glyf table
let GlyfTable = new r.Struct({
  version: r.uint32,
  numGlyphs: r.uint16,
  indexFormat: r.uint16,
  nContourStreamSize: r.uint32,
  nPointsStreamSize: r.uint32,
  flagStreamSize: r.uint32,
  glyphStreamSize: r.uint32,
  compositeStreamSize: r.uint32,
  bboxStreamSize: r.uint32,
  instructionStreamSize: r.uint32,
  nContours: new Substream('nContourStreamSize'),
  nPoints: new Substream('nPointsStreamSize'),
  flags: new Substream('flagStreamSize'),
  glyphs: new Substream('glyphStreamSize'),
  composites: new Substream('compositeStreamSize'),
  bboxes: new Substream('bboxStreamSize'),
  instructions: new Substream('instructionStreamSize')
});

const WORD_CODE = 253;

bigMetrics: BigMetrics
  },

  3: {
    offsetArray: new r.Array(r.uint16, t => t.parent.lastGlyphIndex - t.parent.firstGlyphIndex + 1)
  },

  4: {
    numGlyphs: r.uint32,
    glyphArray: new r.Array(CodeOffsetPair, t => t.numGlyphs + 1)
  },

  5: {
    imageSize: r.uint32,
    bigMetrics: BigMetrics,
    numGlyphs: r.uint32,
    glyphCodeArray: new r.Array(r.uint16, 'numGlyphs')
  }
});

let IndexSubtableArray = new r.Struct({
  firstGlyphIndex: r.uint16,
  lastGlyphIndex: r.uint16,
  subtable: new r.Pointer(r.uint32, IndexSubtable)
});

let BitmapSizeTable = new r.Struct({
  indexSubTableArray: new r.Pointer(r.uint32, new r.Array(IndexSubtableArray, 1), { type: 'parent' }),
  indexTablesSize: r.uint32,
  numberOfIndexSubTables: r.uint32,
  colorRef: r.uint32,
  hori: SBitLineMetrics,

deviceTable:    new r.Pointer(r.uint16, Device)
  }
});

let LigGlyph = new r.Array(new r.Pointer(r.uint16, CaretValue), r.uint16);

let LigCaretList = new r.Struct({
  coverage:       new r.Pointer(r.uint16, Coverage),
  ligGlyphCount:  r.uint16,
  ligGlyphs:      new r.Array(new r.Pointer(r.uint16, LigGlyph), 'ligGlyphCount')
});

let MarkGlyphSetsDef = new r.Struct({
  markSetTableFormat: r.uint16,
  markSetCount:       r.uint16,
  coverage:           new r.Array(new r.Pointer(r.uint32, Coverage), 'markSetCount')
});

export default new r.VersionedStruct(r.uint32, {
  header: {
    glyphClassDef:      new r.Pointer(r.uint16, ClassDef),
    attachList:         new r.Pointer(r.uint16, AttachList),
    ligCaretList:       new r.Pointer(r.uint16, LigCaretList),
    markAttachClassDef: new r.Pointer(r.uint16, ClassDef)
  },

  0x00010000: {},
  0x00010002: {
    markGlyphSetsDef:   new r.Pointer(r.uint16, MarkGlyphSetsDef)
  },
  0x00010003: {
    markGlyphSetsDef:   new r.Pointer(r.uint16, MarkGlyphSetsDef),

}
});

let Subtable = new r.Struct({
  length: r.uint32,
  coverage: r.uint24,
  type: r.uint8,
  subFeatureFlags: r.uint32,
  table: SubtableData,
  padding: new r.Reserved(r.uint8, t => t.length - t._currentOffset)
});

let FeatureEntry = new r.Struct({
  featureType:    r.uint16,
  featureSetting: r.uint16,
  enableFlags:    r.uint32,
  disableFlags:   r.uint32
});

let MorxChain = new r.Struct({
  defaultFlags:     r.uint32,
  chainLength:      r.uint32,
  nFeatureEntries:  r.uint32,
  nSubtables:       r.uint32,
  features:         new r.Array(FeatureEntry, 'nFeatureEntries'),
  subtables:        new r.Array(Subtable, 'nSubtables')
});

export default new r.Struct({
  version:  r.uint16,
  unused:   new r.Reserved(r.uint16),
  nChains:  r.uint32,

export function StateTable(entryData = {}, lookupType = r.uint16) {
  let entry = Object.assign({
    newState: r.uint16,
    flags: r.uint16
  }, entryData);

  let Entry = new r.Struct(entry);
  let StateArray = new UnboundedArray(new r.Array(r.uint16, t => t.nClasses));

  let StateHeader = new r.Struct({
    nClasses: r.uint32,
    classTable: new r.Pointer(r.uint32, new LookupTable(lookupType)),
    stateArray: new r.Pointer(r.uint32, StateArray),
    entryTable: new r.Pointer(r.uint32, new UnboundedArray(Entry))
  });

  return StateHeader;
}