Mark FastSharedBufferReader's methods const

Source/platform/image-decoders/FastSharedBufferReader.cpp

 /*
  * Copyright (C) 2015 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
@@ skipping 33 matching lines @@
 void FastSharedBufferReader::setData(PassRefPtr<SharedBuffer> data)
 {
     if (data == m_data)
         return;
     m_data = data;
     m_segment = 0;
     m_segmentLength = 0;
     m_dataPosition = 0;
 }
 
-const char* FastSharedBufferReader::getConsecutiveData(size_t dataPosition, size_t length, char* buffer)
+const char* FastSharedBufferReader::getConsecutiveData(size_t dataPosition, size_t length, char* buffer) const
 {
     RELEASE_ASSERT(dataPosition + length <= m_data->size());
 
     // Use the cached segment if it can serve the request.
     if (dataPosition >= m_dataPosition && dataPosition + length <= m_dataPosition + m_segmentLength)
         return m_segment + dataPosition - m_dataPosition;
 
     // Return a pointer into |m_data| if the request doesn't span segments.
     getSomeDataInternal(dataPosition);
     if (length <= m_segmentLength)
         return m_segment;
 
     for (char* dest = buffer; ; ) {
         size_t copy = std::min(length, m_segmentLength);
         memcpy(dest, m_segment, copy);
         length -= copy;
         if (!length)
             return buffer;
 
         // Continue reading the next segment.
         dest += copy;
         getSomeDataInternal(m_dataPosition + copy);
     }
 }
 
-size_t FastSharedBufferReader::getSomeData(const char*& someData, size_t dataPosition)
+size_t FastSharedBufferReader::getSomeData(const char*& someData, size_t dataPosition) const
 {
     getSomeDataInternal(dataPosition);
     someData = m_segment;
     return m_segmentLength;
 }
 
-void FastSharedBufferReader::getSomeDataInternal(unsigned dataPosition)
+void FastSharedBufferReader::getSomeDataInternal(unsigned dataPosition) const
 {
     m_dataPosition = dataPosition;
     m_segmentLength = m_data->getSomeData(m_segment, dataPosition);
     ASSERT(m_segmentLength);
 }
 
 } // namespace blink