#include "winmmap.h"
#include <windows.h>
/*mmap section got from imagick sources*/
/*
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+  m m a p                                                                    %
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%  Method mmap emulates the Unix method of the same name.
%
%  The format of the mmap method is:
%
%    MagickExport void *mmap(char *address,size_t length,int protection,
%      int access,int file,off_t offset)
%
%
*/
void *mmap(char *address, size_t length, int protection, int access,
           int file, off_t offset)
{
    void
    *map;

    HANDLE
    handle;

    map = (void *) NULL;
    handle = INVALID_HANDLE_VALUE;
    switch (protection) {
    case PROT_READ:
    default: {
        handle = CreateFileMapping((HANDLE) _get_osfhandle(file), 0, PAGE_READONLY, 0,
                                   length, 0);
        if (!handle)
            break;
        map = (void *) MapViewOfFile(handle, FILE_MAP_READ, 0, 0, length);
        CloseHandle(handle);
        break;
    }
    case PROT_WRITE: {
        handle = CreateFileMapping((HANDLE) _get_osfhandle(file), 0, PAGE_READWRITE, 0,
                                   length, 0);
        if (!handle)
            break;
        map = (void *) MapViewOfFile(handle, FILE_MAP_WRITE, 0, 0, length);
        CloseHandle(handle);
        break;
    }
    case PROT_READWRITE: {
        handle = CreateFileMapping((HANDLE) _get_osfhandle(file), 0, PAGE_READWRITE, 0,
                                   length, 0);
        if (!handle)
            break;
        map = (void *) MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, length);
        CloseHandle(handle);
        break;
    }
    }
    if (map == (void *) NULL)
        return((void *) MAP_FAILED);
    return((void *) ((char *) map + offset));
}

/*
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+  m u n m a p                                                                %
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%
%  Method munmap emulates the Unix method with the same name.
%
%  The format of the munmap method is:
%
%      int munmap(void *map,size_t length)
%
%  A description of each parameter follows:
%
%    o status:  Method munmap returns 0 on success; otherwise, it
%      returns -1 and sets errno to indicate the error.
%
%    o map: The address of the binary large object.
%
%    o length: The length of the binary large object.
%
%
*/
int munmap(void *map, size_t length)
{
    if (!UnmapViewOfFile(map))
        return(-1);
    return(0);
}