It compiles under windows

Makefile

@@ -1,14 +1,21 @@
 TARGET = unnpk
 
 CFLAGS += -Wall
-LDFLAGS += -lz
+
+ifeq ($(OS),Windows_NT)
+	LDFLAGS += -lz -lWs2_32
+	INCLUDELIB += -Iwindows/sys windows/sys/mman.c
+else
+	LDFLAGS += -lz 
+	INCLUDELIB = 
+endif
 
 .PHONY: all clean
 
 all: $(TARGET)
 
 $(TARGET): unnpk.c
-	$(CC) $(CFLAGS) $< $(LDFLAGS) -o $@
+	$(CC) $(CFLAGS) $(INCLUDELIB) $< $(LDFLAGS) -o $@
 
 clean:
 	rm -f $(TARGET)

unnpk.c

@@ -26,8 +26,14 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/mman.h>
-#include <arpa/inet.h>
+#ifdef __linux__ 
+	#include <arpa/inet.h> //for ntohl
+	#include <sys/mman.h>
+#elif _WIN32
+	#include <winsock2.h> //for ntohl
+	#include "windows/sys/mman.h"
+	#define mkdir(A, B) mkdir(A) //Function to create directory
+#endif
 
 #include <zlib.h>
 
@@ -477,11 +483,14 @@ static int proc_part_data_pkg_info(uint8_t *data, const uint32_t size,
 		       hdr->revision);
 	else
 		printf("Version   : %u.%u\n", hdr->ver_maj, hdr->ver_min);
-	gmtime_r((time_t *)&hdr->timestamp, &tm);
-	strftime(buf, sizeof(buf), "%c", &tm);
-	printf("Timestamp : %u (%s)\n", hdr->timestamp, buf);
-	printf("Unknown   : %s\n", array2str(hdr->unk_30, sizeof(hdr->unk_30)));
-
+	#ifdef __linux__ 
+		gmtime_r((time_t *)&hdr->timestamp, &tm);
+		strftime(buf, sizeof(buf), "%c", &tm);
+		printf("Timestamp : %u (%s)\n", hdr->timestamp, buf);
+	#elif _WIN32
+		printf("Windows doesn't have gmtime_r and I am to lazy to port it to windows :(");
+	#endif
+		printf("Unknown   : %s\n", array2str(hdr->unk_30, sizeof(hdr->unk_30)));
 	return 0;
 }
 

windows/sys/mman.c

@@ -0,0 +1,180 @@
+
+#include <windows.h>
+#include <errno.h>
+#include <io.h>
+
+#include "mman.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 protect;
+
+    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 desiredAccess;
+
+    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 == NULL)
+    {
+        errno = __map_mman_error(GetLastError(), EPERM);
+        return MAP_FAILED;
+    }
+
+    map = MapViewOfFile(fm, desiredAccess, dwFileOffsetHigh, dwFileOffsetLow, len);
+
+    CloseHandle(fm);
+
+    if (map == NULL)
+    {
+        errno = __map_mman_error(GetLastError(), EPERM);
+        return MAP_FAILED;
+    }
+
+    return map;
+}
+
+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;
+}

windows/sys/mman.h

@@ -0,0 +1,55 @@
+/*
+ * sys/mman.h
+ * mman-win32
+ */
+
+#ifndef _SYS_MMAN_H_
+#define _SYS_MMAN_H_
+
+#ifndef _WIN32_WINNT		// Allow use of features specific to Windows XP or later.                   
+#define _WIN32_WINNT 0x0501	// Change this to the appropriate value to target other versions of Windows.
+#endif						
+
+/* All the headers include this file. */
+#ifndef _MSC_VER
+#include <_mingw.h>
+#endif
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define PROT_NONE       0
+#define PROT_READ       1
+#define PROT_WRITE      2
+#define PROT_EXEC       4
+
+#define MAP_FILE        0
+#define MAP_SHARED      1
+#define MAP_PRIVATE     2
+#define MAP_TYPE        0xf
+#define MAP_FIXED       0x10
+#define MAP_ANONYMOUS   0x20
+#define MAP_ANON        MAP_ANONYMOUS
+
+#define MAP_FAILED      ((void *)-1)
+
+/* Flags for msync. */
+#define MS_ASYNC        1
+#define MS_SYNC         2
+#define MS_INVALIDATE   4
+
+void*   mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
+int     munmap(void *addr, size_t len);
+int     mprotect(void *addr, size_t len, int prot);
+int     msync(void *addr, size_t len, int flags);
+int     mlock(const void *addr, size_t len);
+int     munlock(const void *addr, size_t len);
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif /*  _SYS_MMAN_H_ */