brotli

/*
 * Copyright (c) 2016 Jihyun Yu <yjh0502@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * 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 THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */

#include <string>
#include <cstring>

#include <erl_nif.h>
#include "brotli_encoder/encode.h"

using namespace brotli;

#define BADARG             enif_make_badarg(env)

static ERL_NIF_TERM
brotli_encode(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])
{
    unsigned int quality;
    ErlNifBinary data, encoded;

    if (argc != 2) {
        return (BADARG);
    }

    if (!enif_inspect_iolist_as_binary(env, argv[0], &data)) {
        return (BADARG);
    }

    if (!enif_get_uint(env, argv[1], &quality)) {
        return (BADARG);
    }

    size_t length = data.size;
    size_t output_length = length + (length >> 2) + 10240;
    uint8_t* output = new uint8_t[output_length];
    bool ok = BrotliCompressBuffer(BrotliParams(quality),
        length, data.data,
        &output_length, output);
    if(!ok) {
        delete output;
        return (BADARG);
    }
    if (!enif_alloc_binary(output_length, &encoded)) {
        delete output;
        return (BADARG);
    }

    memcpy(encoded.data, output, output_length);
    delete output;

    return enif_make_binary(env, &encoded);
}

static int
brotli_load(ErlNifEnv *env, void **priv_data, ERL_NIF_TERM load_info)
{
    return 0;
}

static ErlNifFunc brotli_exports[] = {
    {"brotli_encode", 2, brotli_encode},
};

ERL_NIF_INIT(brotli_nif, brotli_exports, brotli_load, NULL, NULL, NULL)