Mime sniffer: reduce table from 256 bytes to 4

net/base/mime_sniffer.h

 // Copyright (c) 2011 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 NET_BASE_MIME_SNIFFER_H__
 #define NET_BASE_MIME_SNIFFER_H__
 
 #include <string>
 
 #include "net/base/net_export.h"
@@ skipping 39 matching lines @@
 // uncontrolled data before accepting the results of this function.
 //
 // @param content A buffer containing the bytes to sniff.
 // @param content_size The number of bytes in the |content| buffer.
 // @param result Address at which to place the sniffed mime type.
 // @return Returns true if a MIME type match was found.
 NET_EXPORT bool SniffMimeTypeFromLocalData(const char* content,
                                            size_t content_size,
                                            std::string* result);
 
+// Returns true if |content| contains bytes that are control codes that do
+// not usually appear in plain text.
+// @param content A buffer contains bytes that may be binary.
+// @param size    The number of bytes in the |content| buffer.
+// @return Returns true if |content| looks like binary.
+NET_EXPORT_PRIVATE bool LooksLikeBinary(const char* content, size_t size);
+
 }  // namespace net
 
 #endif  // NET_BASE_MIME_SNIFFER_H__