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node_modules/fontkit/src/tables/HVAR.js

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+import * as r from 'restructure';
+import { resolveLength } from 'restructure';
+import { ItemVariationStore } from './variations';
+
+// TODO: add this to restructure
+class VariableSizeNumber {
+  constructor(size) {
+    this._size = size;
+  }
+
+  decode(stream, parent) {
+    switch (this.size(0, parent)) {
+      case 1: return stream.readUInt8();
+      case 2: return stream.readUInt16BE();
+      case 3: return stream.readUInt24BE();
+      case 4: return stream.readUInt32BE();
+    }
+  }
+
+  size(val, parent) {
+    return resolveLength(this._size, null, parent);
+  }
+}
+
+let MapDataEntry = new r.Struct({
+  entry: new VariableSizeNumber(t => ((t.parent.entryFormat & 0x0030) >> 4) + 1),
+  outerIndex: t => t.entry >> ((t.parent.entryFormat & 0x000F) + 1),
+  innerIndex: t => t.entry & ((1 << ((t.parent.entryFormat & 0x000F) + 1)) - 1)
+});
+
+let DeltaSetIndexMap = new r.Struct({
+  entryFormat: r.uint16,
+  mapCount: r.uint16,
+  mapData: new r.Array(MapDataEntry, 'mapCount')
+});
+
+export default new r.Struct({
+  majorVersion: r.uint16,
+  minorVersion: r.uint16,
+  itemVariationStore: new r.Pointer(r.uint32, ItemVariationStore),
+  advanceWidthMapping: new r.Pointer(r.uint32, DeltaSetIndexMap),
+  LSBMapping: new r.Pointer(r.uint32, DeltaSetIndexMap),
+  RSBMapping: new r.Pointer(r.uint32, DeltaSetIndexMap)
+});