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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 MOJO_PUBLIC_CPP_BINDINGS_LIB_SCRATCH_BUFFER_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_SCRATCH_BUFFER_H_
#include <deque>
#include "mojo/public/cpp/bindings/buffer.h"
#include "mojo/public/cpp/system/macros.h"
namespace mojo {
namespace internal {
// The following class is designed to be allocated on the stack. If necessary,
// it will failover to allocating objects on the heap.
class ScratchBuffer : public Buffer {
public:
ScratchBuffer();
virtual ~ScratchBuffer();
virtual void* Allocate(size_t num_bytes, Destructor func = NULL)
MOJO_OVERRIDE;
private:
enum { kMinSegmentSize = 512 };
struct Segment {
Segment* next;
char* cursor;
char* end;
};
void* AllocateInSegment(Segment* segment, size_t num_bytes);
void AddOverflowSegment(size_t delta);
char fixed_data_[kMinSegmentSize];
Segment fixed_;
Segment* overflow_;
struct PendingDestructor {
Destructor func;
void* address;
};
std::deque<PendingDestructor> pending_dtors_;
MOJO_DISALLOW_COPY_AND_ASSIGN(ScratchBuffer);
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SCRATCH_BUFFER_H_
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