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+// Copyright 2008, Google Inc.
+// 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.
+
+#ifndef NET_BASE_MIME_SNIFFER_H__
+#define NET_BASE_MIME_SNIFFER_H__
+
+#include <string>
+
+class GURL;
+
+namespace mime_util {
+
+// Examine the URL and the mime_type and decide whether we should sniff a
+// replacement mime type from the content.
+//
+// @param url The URL from which we obtained the content.
+// @param mime_type The current mime type, e.g. from the Content-Type header.
+// @return Returns true if we should sniff the mime type.
+bool ShouldSniffMimeType(const GURL& url, const std::string& mime_type);
+
+// Guess a mime type from the first few bytes of content an its URL.  Always
+// assigns |result| with its best guess of a mime type.
+//
+// @param content A buffer containing the bytes to sniff.
+// @param content_size The number of bytes in the |content| buffer.
+// @param url The URL from which we obtained this content.
+// @param type_hint The current mime type, e.g. from the Content-Type header.
+// @param result Address at which to place the sniffed mime type.
+// @return Returns true if we have enough content to guess the mime type.
+bool SniffMimeType(const char* content, size_t content_size,
+                   const GURL& url, const std::string& type_hint,
+                   std::string* result);
+
+}  // namespace mime_util
+
+#endif  // NET_BASE_MIME_SNIFFER_H__