/* Copyright  (C) 2010-2020 The RetroArch team
 *
 * ---------------------------------------------------------------------------------------
 * The following license statement only applies to this file (memmap_win32.c).
 * ---------------------------------------------------------------------------------------
 *
 * 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 <windows.h>
#include <errno.h>
#include <io.h>

#include "memmap.h"

#ifndef FILE_MAP_EXECUTE
#define FILE_MAP_EXECUTE    0x0020
#endif /* FILE_MAP_EXECUTE */

static int __map_mman_error(const DWORD err, const int deferr)
{
    if (err == 0)
        return 0;
    /* TODO: implement */
    return err;
}

static DWORD __map_mmap_prot_page(const int prot)
{
    DWORD protect = 0;
    
    if (prot == PROT_NONE)
        return 0;
        
    if ((prot & PROT_EXEC) != 0)
        protect = ((prot & PROT_WRITE) != 0) ? 
                    PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ;
    else
        protect = ((prot & PROT_WRITE) != 0) ?
                    PAGE_READWRITE : PAGE_READONLY;
    
    return protect;
}

static DWORD __map_mmap_prot_file(const int prot)
{
    DWORD desiredAccess = 0;
    
    if (prot == PROT_NONE)
        return 0;
        
    if ((prot & PROT_READ) != 0)
        desiredAccess |= FILE_MAP_READ;
    if ((prot & PROT_WRITE) != 0)
        desiredAccess |= FILE_MAP_WRITE;
    if ((prot & PROT_EXEC) != 0)
        desiredAccess |= FILE_MAP_EXECUTE;
    
    return desiredAccess;
}

void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
{
    HANDLE fm, h;
    
    void * map = MAP_FAILED;
    
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4293)
#endif

    const DWORD dwFileOffsetLow = (sizeof(off_t) <= sizeof(DWORD)) ? 
                    (DWORD)off : (DWORD)(off & 0xFFFFFFFFL);
    const DWORD dwFileOffsetHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
                    (DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL);
    const DWORD protect = __map_mmap_prot_page(prot);
    const DWORD desiredAccess = __map_mmap_prot_file(prot);

    const off_t maxSize = off + (off_t)len;

    const DWORD dwMaxSizeLow = (sizeof(off_t) <= sizeof(DWORD)) ? 
                    (DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL);
    const DWORD dwMaxSizeHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
                    (DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL);

#ifdef _MSC_VER
#pragma warning(pop)
#endif

    errno = 0;
    
    if (len == 0 
        /* Unsupported flag combinations */
        || (flags & MAP_FIXED) != 0
        /* Usupported protection combinations */
        || prot == PROT_EXEC)
    {
        errno = EINVAL;
        return MAP_FAILED;
    }
    
    h = ((flags & MAP_ANONYMOUS) == 0) ? 
                    (HANDLE)_get_osfhandle(fildes) : INVALID_HANDLE_VALUE;

    if ((flags & MAP_ANONYMOUS) == 0 && h == INVALID_HANDLE_VALUE)
    {
        errno = EBADF;
        return MAP_FAILED;
    }

    fm = CreateFileMapping(h, NULL, protect, dwMaxSizeHigh, dwMaxSizeLow, NULL);

    if (!fm)
       goto error;
  
    map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len);

    CloseHandle(fm);
  
    if (!map)
       goto error;

    return map;
error:
    errno = __map_mman_error(GetLastError(), EPERM);
    return MAP_FAILED;
}

int munmap(void *addr, size_t len)
{
    if (UnmapViewOfFile(addr))
        return 0;
        
    errno =  __map_mman_error(GetLastError(), EPERM);
    
    return -1;
}

int mprotect(void *addr, size_t len, int prot)
{
    DWORD newProtect = __map_mmap_prot_page(prot);
    DWORD oldProtect = 0;
    
    if (VirtualProtect(addr, len, newProtect, &oldProtect))
        return 0;
    
    errno =  __map_mman_error(GetLastError(), EPERM);
    
    return -1;
}

int msync(void *addr, size_t len, int flags)
{
    if (FlushViewOfFile(addr, len))
        return 0;
    
    errno =  __map_mman_error(GetLastError(), EPERM);
    
    return -1;
}

int mlock(const void *addr, size_t len)
{
    if (VirtualLock((LPVOID)addr, len))
        return 0;
        
    errno =  __map_mman_error(GetLastError(), EPERM);
    
    return -1;
}

int munlock(const void *addr, size_t len)
{
    if (VirtualUnlock((LPVOID)addr, len))
        return 0;
        
    errno =  __map_mman_error(GetLastError(), EPERM);
    
    return -1;
}