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// 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 NET_SPDY_SPDY_PINNABLE_BUFFER_PIECE_H_
#define NET_SPDY_SPDY_PINNABLE_BUFFER_PIECE_H_
#include <memory>
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_piece.h"
#include "net/base/net_export.h"
namespace net {
class SpdyPrefixedBufferReader;
// Helper class of SpdyPrefixedBufferReader.
// Represents a piece of consumed buffer which may (or may not) own its
// underlying storage. Users may "pin" the buffer at a later time to ensure
// a SpdyPinnableBufferPiece owns and retains storage of the buffer.
struct NET_EXPORT_PRIVATE SpdyPinnableBufferPiece {
public:
SpdyPinnableBufferPiece();
~SpdyPinnableBufferPiece();
const char * buffer() const {
return buffer_;
}
size_t length() const {
return length_;
}
operator base::StringPiece() const {
return base::StringPiece(buffer_, length_);
}
// Allocates and copies the buffer to internal storage.
void Pin();
bool IsPinned() const { return storage_ != nullptr; }
// Swaps buffers, including internal storage, with |other|.
void Swap(SpdyPinnableBufferPiece* other);
private:
friend class SpdyPrefixedBufferReader;
const char * buffer_;
size_t length_;
// Null iff |buffer_| isn't pinned.
scoped_ptr<char[]> storage_;
};
} // namespace net
#endif // NET_SPDY_SPDY_PINNABLE_BUFFER_PIECE_H_
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