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//

// Java Does USB

// Copyright (c) 2022 Manuel Bleichenbacher

// Licensed under MIT License

// https://opensource.org/licenses/MIT

//

// Reference C++ code common for Linux / macOS / Windows

//

#pragma once

#include <cstdint>

#include <vector>

/**

* Pseudo Random Number Generator

*/

struct prng

{

/**

* Constructs a new instance

* @param init initial value

*/

prng(uint32_t init);

/**

* Returns the next pseudo random value

* @return pseudo random value

*/

uint32_t next();

/**

* Fills the buffer with pseudo random data

* @param buf buffer receiving the random data

* @param len length of the buffer (in bytes)

*/

void fill(uint8_t *buf, int len);

/**

* Fills the buffer with pseudo random data

* @param buf buffer receiving the random data

* @param len number of bytes to fill (-1 for entire buffer)

*/

void fill(std::vector<uint8_t>& buf, int len = -1);

/**

* Verifies that the passed data matches the next bytes of the sequence.

* @param buf buffer with data to verify

* @param len length of the buffer (in bytes)

* @return -1 if they match, otherwise the position of the difference

*/

int verify(const uint8_t *buf, int len);

/**

* Verifies that the passed data matches the next bytes of the sequence.

* @param buf buffer with data to verify

* @param len number of bytes to verify (-1 for entire buffer)

* @return -1 if they match, otherwise the position of the difference

*/

int verify(const std::vector<uint8_t>& buf, int len = -1);

/**

* Resets the generator to its initial state.

* @param init initial value

*/

void reset(uint32_t init);

private:

uint32_t state;

int nbytes;

uint32_t bits;

};