Implement a parser for Content-Disposition header fields

third_party/WebKit/Source/platform/network/HeaderFieldTokenizer.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef HeaderFieldTokenizer_h
+#define HeaderFieldTokenizer_h
+
+#include "platform/network/ParsedContentHeaderFieldParameters.h"
+#include "platform/wtf/text/WTFString.h"
+
+namespace blink {
+
+// Parses header fields into tokens, quoted strings and separators.
+// Commonly used by ParsedContent* classes.
+class HeaderFieldTokenizer final {
+  STACK_ALLOCATED();
+
+ public:
+  using Mode = ParsedContentHeaderFieldParameters::Mode;
+
+  explicit HeaderFieldTokenizer(const String& header_field);
+  HeaderFieldTokenizer(HeaderFieldTokenizer&&);
+
+  // Try to parse a separator character, a token or either a token or a quoted
+  // string from the |header_field| input. Return |true| on success. Return
+  // |false| if the separator character, the token or the quoted string is
+  // missing or invalid.
+  bool Consume(char);
+  bool ConsumeToken(Mode, StringView& output);
+  bool ConsumeTokenOrQuotedString(Mode, String& output);
+
+  unsigned Index() const { return index_; }
+  bool IsConsumed() const { return index_ >= input_.length(); }
+  void SkipSpaces();
+
+ private:
+  bool ConsumeQuotedString(String& output);
+
+  unsigned index_;
+  const String input_;
+};
+
+}  // namespace blink
+
+#endif