/*
   Copyright (c) 2014 Anton Titov.

   Copyright (c) 2014 pCloud Ltd.  All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met: Redistributions of source code must retain the above
   copyright notice, this list of conditions and the following
   disclaimer.  Redistributions in binary form must reproduce the
   above copyright notice, this list of conditions and the following
   disclaimer in the documentation and/or other materials provided
   with the distribution.  Neither the name of pCloud Ltd nor the
   names of its contributors may be used to endorse or promote
   products derived from this software without specific prior written
   permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL pCloud
   Ltd BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
   USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
   DAMAGE.
*/

#ifndef _PSYNC_FSCRYPTO_H
#define _PSYNC_FSCRYPTO_H

#include "pcryptofolder.h"
#include "pfs.h"

#define PSYNC_CRYPTO_MAX_SECTORID (UINT32_MAX - 1)
#define PSYNC_CRYPTO_INVALID_SECTORID (UINT32_MAX)

#define PSYNC_CRYPTO_HASH_TREE_SECTORS                                         \
  (PSYNC_CRYPTO_SECTOR_SIZE / PSYNC_CRYPTO_AUTH_SIZE)

typedef uint32_t psync_crypto_sectorid_t;
typedef int32_t psync_crypto_sectorid_diff_t;

typedef struct {
  psync_tree tree;
  psync_crypto_sectorid_t sectorid;
  uint32_t logoffset;
  pcrypto_sector_auth_t auth;
} psync_sector_inlog_t;

typedef pcrypto_sector_auth_t psync_crypto_auth_sector_t[PSYNC_CRYPTO_HASH_TREE_SECTORS];

int pfs_crpt_init_log(psync_openfile_t *of);
int pfs_crpt_read_new(psync_openfile_t *of, char *buf, uint64_t size, uint64_t offset);
int pfs_crpt_write_new(psync_openfile_t *of, const char *buf, uint64_t size, uint64_t offset);
int pfs_crpt_read_mod(psync_openfile_t *of, char *buf, uint64_t size, uint64_t offset);
int pfs_crpt_write_mod(psync_openfile_t *of, const char *buf, uint64_t size, uint64_t offset);
int pfs_crpt_truncate(psync_openfile_t *of, uint64_t size);
int pfs_crpt_flush(psync_openfile_t *of);
psync_crypto_sectorid_t pfs_crpt_sector_id(psync_crypto_sectorid_t sectorid);
void pfs_crpt_offset_by_size(uint64_t size, psync_crypto_offsets_t *offsets);
uint64_t pfs_crpt_plain_size(uint64_t cryptosize);
uint64_t pfs_crpt_crypto_size(uint64_t plainsize);
void pfs_crpt_get_auth_off(psync_crypto_sectorid_t sectorid, uint32_t level, psync_crypto_offsets_t *offsets, uint64_t *offset, uint32_t *size, uint32_t *authid);
void pfs_crpt_check_logs();

#endif