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/*
* SecureQueue
* (C) 1999-2007 Jack Lloyd
* 2012 Markus Wanner
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_SECURE_QUEUE_H__
#define BOTAN_SECURE_QUEUE_H__
#include <botan/data_src.h>
#include <botan/filter.h>
namespace Botan {
/**
* A queue that knows how to zeroize itself
*/
class BOTAN_DLL SecureQueue : public Fanout_Filter, public DataSource
{
public:
std::string name() const { return "Queue"; }
void write(const byte[], size_t);
size_t read(byte[], size_t);
size_t peek(byte[], size_t, size_t = 0) const;
size_t get_bytes_read() const;
bool end_of_data() const;
bool empty() const;
/**
* @return number of bytes available in the queue
*/
size_t size() const;
bool attachable() { return false; }
/**
* SecureQueue assignment
* @param other the queue to copy
*/
SecureQueue& operator=(const SecureQueue& other);
/**
* SecureQueue default constructor (creates empty queue)
*/
SecureQueue();
/**
* SecureQueue copy constructor
* @param other the queue to copy
*/
SecureQueue(const SecureQueue& other);
~SecureQueue() { destroy(); }
private:
size_t bytes_read;
void destroy();
class SecureQueueNode* head;
class SecureQueueNode* tail;
};
}
#endif
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