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node_modules/fontkit/src/tables/WOFF2Directory.js

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+import * as r from 'restructure';
+
+const Base128 = {
+  decode(stream) {
+    let result = 0;
+    let iterable = [0, 1, 2, 3, 4];
+    for (let j = 0; j < iterable.length; j++) {
+      let i = iterable[j];
+      let code = stream.readUInt8();
+
+      // If any of the top seven bits are set then we're about to overflow.
+      if (result & 0xe0000000) {
+        throw new Error('Overflow');
+      }
+
+      result = (result << 7) | (code & 0x7f);
+      if ((code & 0x80) === 0) {
+        return result;
+      }
+    }
+
+    throw new Error('Bad base 128 number');
+  }
+};
+
+let knownTags = [
+  'cmap', 'head', 'hhea', 'hmtx', 'maxp', 'name', 'OS/2', 'post', 'cvt ',
+  'fpgm', 'glyf', 'loca', 'prep', 'CFF ', 'VORG', 'EBDT', 'EBLC', 'gasp',
+  'hdmx', 'kern', 'LTSH', 'PCLT', 'VDMX', 'vhea', 'vmtx', 'BASE', 'GDEF',
+  'GPOS', 'GSUB', 'EBSC', 'JSTF', 'MATH', 'CBDT', 'CBLC', 'COLR', 'CPAL',
+  'SVG ', 'sbix', 'acnt', 'avar', 'bdat', 'bloc', 'bsln', 'cvar', 'fdsc',
+  'feat', 'fmtx', 'fvar', 'gvar', 'hsty', 'just', 'lcar', 'mort', 'morx',
+  '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() {
+  let tables = {};
+  for (let i = 0; i < this.tables.length; i++) {
+    let table = this.tables[i];
+    tables[table.tag] = table;
+  }
+
+  return this.tables = tables;
+};
+
+export default WOFF2Directory;