/***************************************************************************************************

  Zyan Core Library (Zycore-C)

  Original Author : Florian Bernd

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.

***************************************************************************************************/

#include "zydis/Zycore/API/Memory.h"

#ifndef ZYAN_NO_LIBC

#if   defined(ZYAN_WINDOWS)

#elif defined(ZYAN_POSIX)
#   include <unistd.h>
#else
#   error "Unsupported platform detected"
#endif

/* ============================================================================================== */
/* Exported functions                                                                             */
/* ============================================================================================== */

/* ---------------------------------------------------------------------------------------------- */
/* General                                                                                        */
/* ---------------------------------------------------------------------------------------------- */

ZyanU32 ZyanMemoryGetSystemPageSize(void)
{
#if defined(ZYAN_WINDOWS)

    SYSTEM_INFO system_info;
    GetSystemInfo(&system_info);

    return system_info.dwPageSize;

#elif defined(ZYAN_POSIX)

    return sysconf(_SC_PAGE_SIZE);

#endif
}

ZyanU32 ZyanMemoryGetSystemAllocationGranularity(void)
{
#if defined(ZYAN_WINDOWS)

    SYSTEM_INFO system_info;
    GetSystemInfo(&system_info);

    return system_info.dwAllocationGranularity;

#elif defined(ZYAN_POSIX)

    return sysconf(_SC_PAGE_SIZE);

#endif
}

/* ---------------------------------------------------------------------------------------------- */
/* Memory management                                                                              */
/* ---------------------------------------------------------------------------------------------- */

ZyanStatus ZyanMemoryVirtualProtect(void* address, ZyanUSize size, 
    ZyanMemoryPageProtection protection)
{
#if defined(ZYAN_WINDOWS)

    DWORD old;
    if (!VirtualProtect(address, size, protection, &old))
    {
        return ZYAN_STATUS_BAD_SYSTEMCALL;
    }

#elif defined(ZYAN_POSIX)

    if (mprotect(address, size, protection))
    {
        return ZYAN_STATUS_BAD_SYSTEMCALL;
    }

#endif

    return ZYAN_STATUS_SUCCESS;
}

ZyanStatus ZyanMemoryVirtualFree(void* address, ZyanUSize size)
{
#if defined(ZYAN_WINDOWS)

    ZYAN_UNUSED(size);
    if (!VirtualFree(address, 0, MEM_RELEASE))
    {
        return ZYAN_STATUS_BAD_SYSTEMCALL;
    }

#elif defined(ZYAN_POSIX)

    if (munmap(address, size))
    {
        return ZYAN_STATUS_BAD_SYSTEMCALL;
    }

#endif

    return ZYAN_STATUS_SUCCESS;    
}

/* ---------------------------------------------------------------------------------------------- */

/* ============================================================================================== */

#endif /* ZYAN_NO_LIBC */
