// ssdeep-rs: A Rust wrapper for ssdeep.
//
// Copyright (c) 2016 Petr Zemek <s3rvac@petrzemek.net>
//
// 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 3 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, see <http://www.gnu.org/licenses/>.

//! Native bindings to the `libfuzzy` library, which is internally used by the
//! [ssdeep-rs](https://github.com/s3rvac/ssdeep-rs) crate. See its description
//! for more information.

extern crate libc;

use libc::c_char;
use libc::c_int;
use libc::c_uchar;

// From fuzzy.h:

/// Length of an individual fuzzy hash signature component.
const SPAMSUM_LENGTH: usize = 64;

/// The longest possible length for a fuzzy hash signature.
pub const FUZZY_MAX_RESULT: usize = 2 * SPAMSUM_LENGTH + 20;

extern "C" {
    /// Computes the match score between two fuzzy hashes.
    // int fuzzy_compare(const char *sig1, const char *sig2);
    pub fn fuzzy_compare(sig1: *const c_char, sig2: *const c_char) -> c_int;

    /// Computes the fuzzy hash of a buffer.
    // int fuzzy_hash_buf(const unsigned char *buf, uint32_t buf_len, char *result);
    pub fn fuzzy_hash_buf(buf: *const c_uchar, buf_len: u32, result: *mut c_char) -> c_int;

    /// Computes the fuzzy hash of a file.
    // int fuzzy_hash_filename(const char *filename, char *result);
    pub fn fuzzy_hash_filename(filename: *const c_char, result: *mut c_char) -> c_int;
}