source: OGRE/trunk/ogre_dependencies/Dependencies/include/zzip/__mmap.h @ 692

Revision 692, 2.9 KB checked in by mattausch, 19 years ago (diff)

adding ogre 1.2 and dependencies

Line 
1#ifndef __ZZIP_INTERNAL_MMAP_H
2#define __ZZIP_INTERNAL_MMAP_H
3#include <zzip/types.h>
4
5/*
6 * DO NOT USE THIS CODE.
7 *
8 * It is an internal header file for zziplib that carries some inline
9 * functions (or just static members) and a few defines, simply to be
10 * able to reuse these across - and have everything in a specific place.
11 *
12 * Copyright (c) 2002,2003 Guido Draheim
13 *          All rights reserved,
14 *          use under the restrictions of the
15 *          Lesser GNU General Public License
16 *          or alternatively the restrictions
17 *          of the Mozilla Public License 1.1
18 */
19
20#ifdef _USE_MMAP
21#if    defined ZZIP_HAVE_SYS_MMAN_H
22#include <sys/mman.h>
23#define USE_POSIX_MMAP 1
24#elif defined ZZIP_HAVE_WINBASE_H || defined WIN32
25#include <windows.h>
26#define USE_WIN32_MMAP 1
27#else
28#undef _USE_MMAP
29#endif
30#endif
31
32/* -------------- specify MMAP function imports --------------------------- */
33
34#if     defined  USE_POSIX_MMAP
35#define USE_MMAP 1
36
37#define _zzip_mmap(user, fd, offs, len) \
38              mmap (0, len, PROT_READ, MAP_SHARED, fd, offs)
39#define _zzip_munmap(user, ptr, len) \
40              munmap (ptr, len)
41#define _zzip_getpagesize(user) getpagesize()
42
43#ifndef MAP_FAILED /* hpux10.20 does not have it */
44#define MAP_FAILED ((void*)(-1))
45#endif
46
47#elif   defined USE_WIN32_MMAP
48#define USE_MMAP 1
49#ifndef MAP_FAILED
50#define MAP_FAILED 0
51#endif
52/* we (ab)use the "*user" variable to store the FileMapping handle */
53                 /* which assumes (sizeof(long) == sizeof(HANDLE)) */
54
55static size_t win32_getpagesize ()
56{
57    SYSTEM_INFO si; GetSystemInfo (&si);
58    return si.dwAllocationGranularity;
59}
60static void*  win32_mmap (long* user, int fd, zzip_off_t offs, size_t len)
61{
62    if (! user || *user != 1) /* || offs % getpagesize() */
63        return 0;
64  {
65    HANDLE hFile = (HANDLE)_get_osfhandle(fd);
66    if (hFile)
67        *user = (int) CreateFileMapping (hFile, 0, PAGE_READONLY, 0, 0, NULL);
68    if (*user)
69    {
70        char* p = 0;
71        p = MapViewOfFile(*(HANDLE*)user, FILE_MAP_READ, 0, offs, len);
72        if (p) return p + offs;
73        CloseHandle (*(HANDLE*)user); *user = 1;
74    }
75    return MAP_FAILED;
76  }
77}
78static void win32_munmap (long* user, char* fd_map, size_t len)
79{
80    UnmapViewOfFile (fd_map);
81    CloseHandle (*(HANDLE*)user); *user = 1;
82}
83
84#define _zzip_mmap(user, fd, offs, len) \
85        win32_mmap ((long*) &(user), fd, offs, len)
86#define _zzip_munmap(user, ptr, len) \
87        win32_munmap ((long*) &(user), ptr, len)
88#define _zzip_getpagesize(user) win32_getpagesize()
89
90#else   /* disable */
91#define USE_MMAP 0
92/* USE_MAP is intentional: we expect the compiler to do some "code removal"
93 * on any source code enclosed in if (USE_MMAP) {...}   i.e. the unreachable
94 * branch of an if (0) {....} is not emitted to the final object binary. */
95
96#ifndef MAP_FAILED
97#define MAP_FAILED  0
98#endif
99
100#define _zzip_mmap(user, fd, offs, len) (MAP_FAILED)
101#define _zzip_munmap(user, ptr, len) {}
102#define _zzip_getpagesize(user) 1
103
104#endif /* USE_MMAP defines */
105
106
107#endif
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