Fix PartialCircularBuffer OOB memcpy().

chrome/common/partial_circular_buffer.h

 // Copyright 2013 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 CHROME_COMMON_PARTIAL_CIRCULAR_BUFFER_H_
 #define CHROME_COMMON_PARTIAL_CIRCULAR_BUFFER_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 
@@ skipping 34 matching lines @@
 #pragma pack(push)
 #pragma pack(4)
   struct BufferData {
     uint32 total_written;
     uint32 wrap_position;
     uint32 end_position;
     uint8 data[1];
   };
 #pragma pack(pop)
 
-  void DoWrite(void* dest, const void* src, uint32 num);
+  uint32 DoWrite(const uint8* input, uint32 input_size);

[Nico, 2015/04/08 23:13:05]

Document what this returns, mention that it can return less than input_size if
it needs to wrap.

[gzobqq, 2015/04/09 08:36:40]

I changed DoWrite() to handle the complete input instead.

 
   // Used for reading and writing.
   BufferData* buffer_data_;
   uint32 memory_buffer_size_;
   uint32 data_size_;
   uint32 position_;
 
   // Used for reading.
   uint32 total_read_;
 };
 
 #endif  // CHROME_COMMON_PARTIAL_CIRCULAR_BUFFER_H_