/* XMRig
 * Copyright 2010      Jeff Garzik <jgarzik@pobox.com>
 * Copyright 2012-2014 pooler      <pooler@litecoinpool.org>
 * Copyright 2014      Lucas Jones <https://github.com/lucasjones>
 * Copyright 2014-2016 Wolf9466    <https://github.com/OhGodAPet>
 * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
 * Copyright 2016-2017 XMRig       <support@xmrig.com>
 *
 *
 *   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/>.
 */


#include <memory.h>


#include "crypto/CryptoNight.h"
#include "Mem.h"
#include "Options.h"


bool Mem::m_doubleHash = false;
int Mem::m_algo        = 0;
int Mem::m_flags       = 0;
int Mem::m_threads     = 0;
size_t Mem::m_offset   = 0;
uint8_t *Mem::m_memory = nullptr;


cryptonight_ctx *Mem::create(int threadId)
{
#   ifndef XMRIG_NO_AEON
    if (m_algo == Options::ALGO_CRYPTONIGHT_LITE) {
        return createLite(threadId);
    }
#   endif

    cryptonight_ctx *ctx = reinterpret_cast<cryptonight_ctx *>(&m_memory[MEMORY - sizeof(cryptonight_ctx) * (threadId + 1)]);

    const int ratio = m_doubleHash ? 2 : 1;
    ctx->memory = &m_memory[MEMORY * (threadId * ratio + 1)];

    return ctx;
}



void *Mem::calloc(size_t num, size_t size)
{
    void *mem = &m_memory[m_offset];
    m_offset += (num * size);

    memset(mem, 0, num * size);

    return mem;
}


#ifndef XMRIG_NO_AEON
cryptonight_ctx *Mem::createLite(int threadId) {
    cryptonight_ctx *ctx;

    if (!m_doubleHash) {
        const size_t offset = MEMORY * (threadId + 1);

        ctx = reinterpret_cast<cryptonight_ctx *>(&m_memory[offset + MEMORY_LITE]);
        ctx->memory = &m_memory[offset];
        return ctx;
    }

    ctx = reinterpret_cast<cryptonight_ctx *>(&m_memory[MEMORY - sizeof(cryptonight_ctx) * (threadId + 1)]);
    ctx->memory = &m_memory[MEMORY * (threadId + 1)];

    return ctx;
}
#endif