/*
 * ProFTPD - mod_sftp message format
 * Copyright (c) 2008-2022 TJ Saunders
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
 *
 * As a special exemption, TJ Saunders and other respective copyright holders
 * give permission to link this program with OpenSSL, and distribute the
 * resulting executable, without including the source code for OpenSSL in the
 * source distribution.
 */

#ifndef MOD_SFTP_MSG_H
#define MOD_SFTP_MSG_H

#include "mod_sftp.h"

unsigned char sftp_msg_read_byte(pool *, unsigned char **, uint32_t *);
int sftp_msg_read_bool(pool *, unsigned char **, uint32_t *);
unsigned char *sftp_msg_read_data(pool *, unsigned char **, uint32_t *, size_t);
#if defined(PR_USE_OPENSSL_ECC)
EC_POINT *sftp_msg_read_ecpoint(pool *, unsigned char **, uint32_t *,
  const EC_GROUP *, EC_POINT *);
#endif /* PR_USE_OPENSSL_ECC */
uint32_t sftp_msg_read_int(pool *, unsigned char **, uint32_t *);
uint64_t sftp_msg_read_long(pool *, unsigned char **, uint32_t *);
const BIGNUM *sftp_msg_read_mpint(pool *, unsigned char **, uint32_t *);
char *sftp_msg_read_string(pool *, unsigned char **, uint32_t *);

/* Variant of the Message Read API whose return value indicates the number
 * of bytes of the message actually read.  A zero-length return value indicates
 * failure to read the requested data type.
 */
uint32_t sftp_msg_read_byte2(pool *, unsigned char **, uint32_t *, unsigned char *);
uint32_t sftp_msg_read_bool2(pool *, unsigned char **, uint32_t *, int *);
uint32_t sftp_msg_read_data2(pool *, unsigned char **, uint32_t *, size_t, unsigned char **);
#if defined(PR_USE_OPENSSL_ECC)
uint32_t sftp_msg_read_ecpoint2(pool *, unsigned char **, uint32_t *,
  const EC_GROUP *, EC_POINT **);
#endif /* PR_USE_OPENSSL_ECC */
uint32_t sftp_msg_read_int2(pool *, unsigned char **, uint32_t *, uint32_t *);
uint32_t sftp_msg_read_long2(pool *, unsigned char **, uint32_t *, uint64_t *);
uint32_t sftp_msg_read_mpint2(pool *, unsigned char **, uint32_t *,
  const BIGNUM **);
uint32_t sftp_msg_read_string2(pool *, unsigned char **, uint32_t *, char **);

uint32_t sftp_msg_write_byte(unsigned char **, uint32_t *, unsigned char);
uint32_t sftp_msg_write_bool(unsigned char **, uint32_t *, unsigned char);
uint32_t sftp_msg_write_data(unsigned char **, uint32_t *,
  const unsigned char *, size_t, int);
#if defined(PR_USE_OPENSSL_ECC)
uint32_t sftp_msg_write_ecpoint(unsigned char **, uint32_t *, const EC_GROUP *,
  const EC_POINT *);
#endif /* PR_USE_OPENSSL_ECC */
uint32_t sftp_msg_write_int(unsigned char **, uint32_t *, uint32_t);
uint32_t sftp_msg_write_long(unsigned char **, uint32_t *, uint64_t);
uint32_t sftp_msg_write_mpint(unsigned char **, uint32_t *, const BIGNUM *);
uint32_t sftp_msg_write_string(unsigned char **, uint32_t *, const char *);

/* Utility method for obtaining a scratch buffer for constructing SSH2
 * messages without necessarily needing an SSH2 packet.
 */
unsigned char *sftp_msg_getbuf(pool *, size_t);

#endif /* MOD_SFTP_MSG_H */
