Remove trim

Author: blakeembrey

src/index.ts

@@ -75,17 +75,21 @@ export function parse(string: string | ContentTypeSource): ContentType {
     throw new TypeError("argument string is required to be a string");
   }
 
+  const len = header.length;
   const semiIndex = header.indexOf(";");
+  const end = semiIndex !== -1 ? semiIndex : len;
+  const valueStart = skipOWS(header, 0, end);
+  const valueEnd = trailingOWS(header, valueStart, end);
   const type =
-    semiIndex !== -1
-      ? header.slice(0, semiIndex).trim().toLowerCase()
-      : header.trim().toLowerCase();
+    valueStart === 0 && valueEnd === len
+      ? header.toLowerCase()
+      : header.slice(valueStart, valueEnd).toLowerCase();
 
   if (!TYPE_REGEXP.test(type)) {
     throw new TypeError("invalid media type");
   }
 
-  const parameters = parseParameters(header, semiIndex);
+  const parameters = parseParameters(header, end, len);
 
   return { type, parameters };
 }
@@ -109,11 +113,9 @@ function getcontenttype(obj: ContentTypeSource): string {
 function parseParameters(
   header: string,
   index: number,
+  len: number,
 ): Record<string, string> {
   const parameters = Object.create(null);
-  if (index === -1) return parameters;
-
-  const len = header.length;
 
   while (index < len) {
     // Skip `;` and OWS before parameter key.