[692] | 1 | #ifndef __ZZIP_INTERNAL_MMAP_H |
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| 2 | #define __ZZIP_INTERNAL_MMAP_H |
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| 3 | #include <zzip/types.h> |
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| 4 | |
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| 5 | /* |
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| 6 | * DO NOT USE THIS CODE. |
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| 7 | * |
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| 8 | * It is an internal header file for zziplib that carries some inline |
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| 9 | * functions (or just static members) and a few defines, simply to be |
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| 10 | * able to reuse these across - and have everything in a specific place. |
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| 11 | * |
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| 12 | * Copyright (c) 2002,2003 Guido Draheim |
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| 13 | * All rights reserved, |
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| 14 | * use under the restrictions of the |
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| 15 | * Lesser GNU General Public License |
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| 16 | * or alternatively the restrictions |
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| 17 | * of the Mozilla Public License 1.1 |
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| 18 | */ |
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| 19 | |
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| 20 | #ifdef _USE_MMAP |
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| 21 | #if defined ZZIP_HAVE_SYS_MMAN_H |
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| 22 | #include <sys/mman.h> |
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| 23 | #define USE_POSIX_MMAP 1 |
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| 24 | #elif defined ZZIP_HAVE_WINBASE_H || defined WIN32 |
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| 25 | #include <windows.h> |
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| 26 | #define USE_WIN32_MMAP 1 |
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| 27 | #else |
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| 28 | #undef _USE_MMAP |
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| 29 | #endif |
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| 30 | #endif |
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| 31 | |
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| 32 | /* -------------- specify MMAP function imports --------------------------- */ |
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| 33 | |
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| 34 | #if defined USE_POSIX_MMAP |
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| 35 | #define USE_MMAP 1 |
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| 36 | |
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| 37 | #define _zzip_mmap(user, fd, offs, len) \ |
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| 38 | mmap (0, len, PROT_READ, MAP_SHARED, fd, offs) |
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| 39 | #define _zzip_munmap(user, ptr, len) \ |
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| 40 | munmap (ptr, len) |
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| 41 | #define _zzip_getpagesize(user) getpagesize() |
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| 42 | |
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| 43 | #ifndef MAP_FAILED /* hpux10.20 does not have it */ |
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| 44 | #define MAP_FAILED ((void*)(-1)) |
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| 45 | #endif |
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| 46 | |
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| 47 | #elif defined USE_WIN32_MMAP |
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| 48 | #define USE_MMAP 1 |
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| 49 | #ifndef MAP_FAILED |
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| 50 | #define MAP_FAILED 0 |
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| 51 | #endif |
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| 52 | /* we (ab)use the "*user" variable to store the FileMapping handle */ |
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| 53 | /* which assumes (sizeof(long) == sizeof(HANDLE)) */ |
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| 54 | |
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| 55 | static size_t win32_getpagesize () |
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| 56 | { |
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| 57 | SYSTEM_INFO si; GetSystemInfo (&si); |
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| 58 | return si.dwAllocationGranularity; |
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| 59 | } |
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| 60 | static void* win32_mmap (long* user, int fd, zzip_off_t offs, size_t len) |
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| 61 | { |
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| 62 | if (! user || *user != 1) /* || offs % getpagesize() */ |
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| 63 | return 0; |
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| 64 | { |
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| 65 | HANDLE hFile = (HANDLE)_get_osfhandle(fd); |
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| 66 | if (hFile) |
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| 67 | *user = (int) CreateFileMapping (hFile, 0, PAGE_READONLY, 0, 0, NULL); |
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| 68 | if (*user) |
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| 69 | { |
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| 70 | char* p = 0; |
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| 71 | p = MapViewOfFile(*(HANDLE*)user, FILE_MAP_READ, 0, offs, len); |
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| 72 | if (p) return p + offs; |
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| 73 | CloseHandle (*(HANDLE*)user); *user = 1; |
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| 74 | } |
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| 75 | return MAP_FAILED; |
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| 76 | } |
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| 77 | } |
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| 78 | static void win32_munmap (long* user, char* fd_map, size_t len) |
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| 79 | { |
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| 80 | UnmapViewOfFile (fd_map); |
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| 81 | CloseHandle (*(HANDLE*)user); *user = 1; |
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| 82 | } |
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| 83 | |
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| 84 | #define _zzip_mmap(user, fd, offs, len) \ |
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| 85 | win32_mmap ((long*) &(user), fd, offs, len) |
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| 86 | #define _zzip_munmap(user, ptr, len) \ |
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| 87 | win32_munmap ((long*) &(user), ptr, len) |
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| 88 | #define _zzip_getpagesize(user) win32_getpagesize() |
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| 89 | |
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| 90 | #else /* disable */ |
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| 91 | #define USE_MMAP 0 |
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| 92 | /* USE_MAP is intentional: we expect the compiler to do some "code removal" |
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| 93 | * on any source code enclosed in if (USE_MMAP) {...} i.e. the unreachable |
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| 94 | * branch of an if (0) {....} is not emitted to the final object binary. */ |
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| 95 | |
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| 96 | #ifndef MAP_FAILED |
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| 97 | #define MAP_FAILED 0 |
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| 98 | #endif |
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| 99 | |
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| 100 | #define _zzip_mmap(user, fd, offs, len) (MAP_FAILED) |
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| 101 | #define _zzip_munmap(user, ptr, len) {} |
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| 102 | #define _zzip_getpagesize(user) 1 |
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| 103 | |
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| 104 | #endif /* USE_MMAP defines */ |
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| 105 | |
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| 106 | |
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| 107 | #endif |
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