.

node_modules/whatwg-encoding/lib/whatwg-encoding.js

@@ -0,0 +1,47 @@
+"use strict";
+const iconvLite = require("iconv-lite");
+const supportedNames = require("./supported-names.json");
+const labelsToNames = require("./labels-to-names.json");
+
+const supportedNamesSet = new Set(supportedNames);
+
+// https://encoding.spec.whatwg.org/#concept-encoding-get
+exports.labelToName = label => {
+  label = String(label).trim().toLowerCase();
+
+  return labelsToNames[label] || null;
+};
+
+// https://encoding.spec.whatwg.org/#decode
+exports.decode = (buffer, fallbackEncodingName) => {
+  let encoding = fallbackEncodingName;
+  if (!exports.isSupported(encoding)) {
+    throw new RangeError(`"${encoding}" is not a supported encoding name`);
+  }
+
+  const bomEncoding = exports.getBOMEncoding(buffer);
+  if (bomEncoding !== null) {
+    encoding = bomEncoding;
+  }
+
+  // iconv-lite will strip BOMs for us, so no need to do the stuff the spec does
+
+  return iconvLite.decode(buffer, encoding);
+};
+
+// https://github.com/whatwg/html/issues/1910#issuecomment-254017369
+exports.getBOMEncoding = buffer => {
+  if (buffer[0] === 0xFE && buffer[1] === 0xFF) {
+    return "UTF-16BE";
+  } else if (buffer[0] === 0xFF && buffer[1] === 0xFE) {
+    return "UTF-16LE";
+  } else if (buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
+    return "UTF-8";
+  }
+
+  return null;
+};
+
+exports.isSupported = name => {
+  return supportedNamesSet.has(String(name));
+};