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/*
* Copyright (c) 2016-2020, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
/**
* Helper APIs for generating random data from input data stream.
The producer reads bytes from the end of the input and appends them together
to generate a random number in the requested range. If it runs out of input
data, it will keep returning the same value (min) over and over again.
*/
#ifndef FUZZ_DATA_PRODUCER_H
#define FUZZ_DATA_PRODUCER_H
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "fuzz_helpers.h"
/* Struct used for maintaining the state of the data */
typedef struct FUZZ_dataProducer_s FUZZ_dataProducer_t;
/* Returns a data producer state struct. Use for producer initialization. */
FUZZ_dataProducer_t *FUZZ_dataProducer_create(const uint8_t *data, size_t size);
/* Frees the data producer */
void FUZZ_dataProducer_free(FUZZ_dataProducer_t *producer);
/* Returns value between [min, max] */
uint32_t FUZZ_dataProducer_uint32Range(FUZZ_dataProducer_t *producer, uint32_t min,
uint32_t max);
/* Returns a uint32 value */
uint32_t FUZZ_dataProducer_uint32(FUZZ_dataProducer_t *producer);
/* Returns a signed value between [min, max] */
int32_t FUZZ_dataProducer_int32Range(FUZZ_dataProducer_t *producer,
int32_t min, int32_t max);
/* Returns the size of the remaining bytes of data in the producer */
size_t FUZZ_dataProducer_remainingBytes(FUZZ_dataProducer_t *producer);
/* Restricts the producer to only the last newSize bytes of data.
If newSize > current data size, nothing happens. Returns the number of bytes
the producer won't use anymore, after contracting. */
size_t FUZZ_dataProducer_contract(FUZZ_dataProducer_t *producer, size_t newSize);
/* Restricts the producer to use only the last X bytes of data, where X is
a random number in the interval [0, data_size]. Returns the size of the
remaining data the producer won't use anymore (the prefix). */
size_t FUZZ_dataProducer_reserveDataPrefix(FUZZ_dataProducer_t *producer);
#endif // FUZZ_DATA_PRODUCER_H
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