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/* Copyright (C) 2020-2021 Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef _LIBIGLOO__PRNG_H_
#define _LIBIGLOO__PRNG_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include <sys/types.h>
#include <igloo/types.h>
typedef uint64_t igloo_prng_flags_t;
#define igloo_PRNG_FLAG_NONE ((igloo_prng_flags_t)0)
/* Change options */
igloo_error_t igloo_prng_configure(igloo_ro_t instance, igloo_prng_flags_t addflags, igloo_prng_flags_t removeflags, ssize_t overcommitment);
/* Run a reseed now, useful to be run at times of idle */
igloo_error_t igloo_prng_auto_reseed(igloo_ro_t instance, igloo_prng_flags_t flags);
/* write data to the PRNG to seed it */
igloo_error_t igloo_prng_write(igloo_ro_t instance, const void *buffer, size_t len, ssize_t bits, igloo_prng_flags_t flags);
/* read pseudo random bytes from the PRNG */
ssize_t igloo_prng_read(igloo_ro_t instance, void *buffer, size_t len, igloo_prng_flags_t flags);
/* write len pseudo random bytes to a file. If len is -1 a default value is used. */
igloo_error_t igloo_prng_write_file(igloo_ro_t instance, const char *filename, ssize_t len, igloo_prng_flags_t flags);
/* read at max len bytes from the file and see the PRNG with it. if len is -1 all of the file is read. */
igloo_error_t igloo_prng_read_file(igloo_ro_t instance, const char *filename, ssize_t len, ssize_t bits, igloo_prng_flags_t flags);
#ifdef __cplusplus
}
#endif
#endif /* ! _LIBIGLOO__PRNG_H_ */
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