The Tor Browser / file revision

 // Copyright (c) 2006, 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.

 //

 // file_id.h: Return a unique identifier for a file

 //

 #ifndef COMMON_LINUX_FILE_ID_H__

 #define COMMON_LINUX_FILE_ID_H__

 #include <limits.h>

 #include "common/linux/guid_creator.h"

 namespace google_breakpad {

 static const size_t kMDGUIDSize = sizeof(MDGUID);

 class FileID {

  public:

   explicit FileID(const char* path);

   ~FileID() {}

   // Load the identifier for the elf file path specified in the constructor into

   // |identifier|.  Return false if the identifier could not be created for the

   // file.

   // The current implementation will look for a .note.gnu.build-id

   // section and use that as the file id, otherwise it falls back to

   // XORing the first 4096 bytes of the .text section to generate an identifier.

   bool ElfFileIdentifier(uint8_t identifier[kMDGUIDSize]);

   // Load the identifier for the elf file mapped into memory at |base| into

   // |identifier|.  Return false if the identifier could not be created for the

   // file.

   static bool ElfFileIdentifierFromMappedFile(const void* base,

                                               uint8_t identifier[kMDGUIDSize]);

   // Convert the |identifier| data to a NULL terminated string.  The string will

   // be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE).

   // The |buffer| should be at least 37 bytes long to receive all of the data

   // and termination.  Shorter buffers will contain truncated data.

   static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],

                                         char* buffer, int buffer_length);

  private:

   // Storage for the path specified

   char path_[PATH_MAX];

 };

 }  // namespace google_breakpad

 #endif  // COMMON_LINUX_FILE_ID_H__