// Copyright (c) 2012-2016, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin.  If not, see <http://www.gnu.org/licenses/>.

#pragma once

#if !defined(__cplusplus)

#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#include "../Common/static_assert.h"
#include "Common/int-util.h"

static inline void *padd(void *p, size_t i) {
  return (char *) p + i;
}

static inline const void *cpadd(const void *p, size_t i) {
  return (const char *) p + i;
}

static_assert(sizeof(size_t) == 4 || sizeof(size_t) == 8, "size_t must be 4 or 8 bytes long");
static inline void place_length(uint8_t *buffer, size_t bufsize, size_t length) {
  if (sizeof(size_t) == 4) {
    *(uint32_t *) padd(buffer, bufsize - 4) = swap32be((uint32_t) length);
  } else {
    *(uint64_t *) padd(buffer, bufsize - 8) = swap64be(length);
  }
}

#pragma pack(push, 1)
union hash_state {
  uint8_t b[200];
  uint64_t w[25];
};
#pragma pack(pop)
static_assert(sizeof(union hash_state) == 200, "Invalid structure size");

void hash_permutation(union hash_state *state);
void hash_process(union hash_state *state, const uint8_t *buf, size_t count);

#endif

enum {
  HASH_SIZE = 32,
  HASH_DATA_AREA = 136,
  SLOW_HASH_CONTEXT_SIZE = 2097552
};

void cn_fast_hash(const void *data, size_t length, char *hash);

void cn_slow_hash_f(void *, const void *, size_t, void *);

void hash_extra_blake(const void *data, size_t length, char *hash);
void hash_extra_groestl(const void *data, size_t length, char *hash);
void hash_extra_jh(const void *data, size_t length, char *hash);
void hash_extra_skein(const void *data, size_t length, char *hash);

void tree_hash(const char (*hashes)[HASH_SIZE], size_t count, char *root_hash);
size_t tree_depth(size_t count);
void tree_branch(const char (*hashes)[HASH_SIZE], size_t count, char (*branch)[HASH_SIZE]);
void tree_hash_from_branch(const char (*branch)[HASH_SIZE], size_t depth, const char *leaf, const void *path, char *root_hash);
