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/*
* SecureQueue
* (C) 1999-2007 Jack Lloyd
* 2012 Markus Wanner
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#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_PUBLIC_API(2,0) SecureQueue final : public Fanout_Filter, public DataSource
{
public:
std::string name() const override { return "Queue"; }
void write(const uint8_t[], size_t) override;
size_t read(uint8_t[], size_t) override;
size_t peek(uint8_t[], size_t, size_t = 0) const override;
size_t get_bytes_read() const override;
bool end_of_data() const override;
bool empty() const;
bool check_available(size_t n) override { return n <= size(); }
/**
* @return number of bytes available in the queue
*/
size_t size() const;
bool attachable() override { 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:
void destroy();
size_t m_bytes_read;
class SecureQueueNode* m_head;
class SecureQueueNode* m_tail;
};
}
#endif
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