Add unsigned 64-bit integer support to BigEndianReader and BigEndianWriter.

base/big_endian.h

 // Copyright 2014 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 BASE_BIG_ENDIAN_H_
 #define BASE_BIG_ENDIAN_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/strings/string_piece.h"
@@ skipping 45 matching lines @@
   const char* ptr() const { return ptr_; }
   int remaining() const { return end_ - ptr_; }
 
   bool Skip(size_t len);
   bool ReadBytes(void* out, size_t len);
   // Creates a StringPiece in |out| that points to the underlying buffer.
   bool ReadPiece(base::StringPiece* out, size_t len);
   bool ReadU8(uint8* value);
   bool ReadU16(uint16* value);
   bool ReadU32(uint32* value);
+  bool ReadU64(uint64* value);
 
  private:
   // Hidden to promote type safety.
   template<typename T>
   bool Read(T* v);
 
   const char* ptr_;
   const char* end_;
 };
 
 // Allows writing integers in network order (big endian) while iterating over
 // an underlying buffer. All the writing functions advance the internal pointer.
 class BASE_EXPORT BigEndianWriter {
  public:
   BigEndianWriter(char* buf, size_t len);
 
   char* ptr() const { return ptr_; }
   int remaining() const { return end_ - ptr_; }
 
   bool Skip(size_t len);
   bool WriteBytes(const void* buf, size_t len);
   bool WriteU8(uint8 value);
   bool WriteU16(uint16 value);
   bool WriteU32(uint32 value);
+  bool WriteU64(uint64 value);
 
  private:
   // Hidden to promote type safety.
   template<typename T>
   bool Write(T v);
 
   char* ptr_;
   char* end_;
 };
 
 }  // namespace base
 
 #endif  // BASE_BIG_ENDIAN_H_