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// Copyright (c) 2009 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_BASE_IO_BUFFER_H_
#define NET_BASE_IO_BUFFER_H_
#include "base/ref_counted.h"
namespace net {
// This is a simple wrapper around a buffer that provides ref counting for
// easier asynchronous IO handling.
class IOBuffer : public base::RefCountedThreadSafe<IOBuffer> {
public:
IOBuffer() : data_(NULL) {}
explicit IOBuffer(int buffer_size);
virtual ~IOBuffer() {
delete[] data_;
}
char* data() { return data_; }
protected:
// Only allow derived classes to specify data_.
// In all other cases, we own data_, and must delete it at destruction time.
explicit IOBuffer(char* data) : data_(data) {}
char* data_;
};
// This version stores the size of the buffer so that the creator of the object
// doesn't have to keep track of that value.
// NOTE: This doesn't mean that we want to stop sending the size as an explictit
// argument to IO functions. Please keep using IOBuffer* for API declarations.
class IOBufferWithSize : public IOBuffer {
public:
explicit IOBufferWithSize(int size) : IOBuffer(size), size_(size) {}
~IOBufferWithSize() {}
int size() const { return size_; }
private:
int size_;
};
// This version allows the caller to do multiple IO operations reusing a given
// IOBuffer. We don't own data_, we simply make it point to the buffer of the
// passed in IOBuffer, plus the desired offset.
class ReusedIOBuffer : public IOBuffer {
public:
ReusedIOBuffer(IOBuffer* base, int size)
: IOBuffer(base->data()), base_(base), size_(size) {}
~ReusedIOBuffer() {
// We don't really own a buffer.
data_ = NULL;
}
int size() const { return size_; }
void SetOffset(int offset);
private:
scoped_refptr<IOBuffer> base_;
int size_;
};
// This class allows the creation of a temporary IOBuffer that doesn't really
// own the underlying buffer. Please use this class only as a last resort.
// A good example is the buffer for a synchronous operation, where we can be
// sure that nobody is keeping an extra reference to this object so the lifetime
// of the buffer can be completely managed by its intended owner.
class WrappedIOBuffer : public IOBuffer {
public:
explicit WrappedIOBuffer(const char* data)
: IOBuffer(const_cast<char*>(data)) {}
~WrappedIOBuffer() {
data_ = NULL;
}
};
} // namespace net
#endif // NET_BASE_IO_BUFFER_H_
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