Implement a parser for Content-Disposition header fields

third_party/WebKit/Source/platform/network/ContentHeaderFieldInput.cpp

+/*

[horo, 2017/05/22 02:31:19]

Nit: Please use this license header for new files.
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++.md...

// 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.

[e_hakkinen, 2017/05/22 07:17:08]

Done.

+ * Copyright (C) 2011 Google Inc. All rights reserved.
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "platform/network/ContentHeaderFieldInput.h"
+
+#include "platform/wtf/text/StringBuilder.h"
+#include "platform/wtf/text/StringView.h"
+
+namespace blink {
+
+namespace {
+
+using Mode = ContentHeaderFieldInput::Mode;
+
+bool IsTokenCharacter(Mode mode, UChar c) {
+  if (c >= 128)
+    return false;
+  if (c < 0x20)
+    return false;
+
+  switch (c) {
+    case ' ':
+    case ';':
+    case '"':
+      return false;
+    case '(':
+    case ')':
+    case '<':
+    case '>':
+    case '@':
+    case ',':
+    case ':':
+    case '\\':
+    case '/':
+    case '[':
+    case ']':
+    case '?':
+    case '=':
+      return mode == Mode::kRelaxed;
+    default:
+      return true;
+  }
+}
+
+}  // namespace
+
+ContentHeaderFieldInput::ContentHeaderFieldInput(const String& header_field)
+    : index_(0u), input_(header_field) {}
+
+ContentHeaderFieldInput::ContentHeaderFieldInput(ContentHeaderFieldInput&&) =
+    default;
+
+bool ContentHeaderFieldInput::Consume(char c) {
+  DCHECK_NE(c, ' ');
+
+  SkipSpaces();
+  if (IsConsumed() || input_[index_] != c)
+    return false;
+
+  ++index_;
+  return true;
+}
+
+bool ContentHeaderFieldInput::ConsumeQuotedString(String& output) {
+  StringBuilder builder;
+
+  DCHECK_EQ('"', input_[index_]);
+  ++index_;
+
+  while (!IsConsumed()) {
+    if (input_[index_] == '"') {
+      output = builder.ToString();
+      ++index_;
+      return true;
+    }
+    if (input_[index_] == '\\') {
+      ++index_;
+      if (IsConsumed())
+        return false;
+    }
+    builder.Append(input_[index_]);
+    ++index_;
+  }
+  return false;
+}
+
+bool ContentHeaderFieldInput::ConsumeToken(Mode mode, StringView& output) {
+  DCHECK(output.IsNull());
+
+  SkipSpaces();
+
+  auto start = index_;
+  while (!IsConsumed() && IsTokenCharacter(mode, input_[index_]))
+    ++index_;
+
+  if (start == index_)
+    return false;
+
+  output = StringView(input_, start, index_ - start);
+  return true;
+}
+
+bool ContentHeaderFieldInput::ConsumeTokenOrQuotedString(Mode mode,
+                                                         String& output) {
+  SkipSpaces();
+  if (IsConsumed())
+    return false;
+
+  if (input_[index_] == '"')
+    return ConsumeQuotedString(output);
+
+  StringView view;
+  if (!ConsumeToken(mode, view))
+    return false;
+  output = view.ToString();
+  return true;
+}
+
+void ContentHeaderFieldInput::SkipSpaces() {
+  while (!IsConsumed() && input_[index_] == ' ')
+    ++index_;
+}
+
+}  // namespace blink