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#ifndef __ZZIP_INTERNAL_MMAP_H
#define __ZZIP_INTERNAL_MMAP_H
#include <zzip/types.h>
/*
* DO NOT USE THIS CODE.
*
* It is an internal header file for zziplib that carries some inline
* functions (or just static members) and a few defines, simply to be
* able to reuse these across - and have everything in a specific place.
*
* Copyright (c) 2002,2003 Guido Draheim
* All rights reserved,
* use under the restrictions of the
* Lesser GNU General Public License
* or alternatively the restrictions
* of the Mozilla Public License 1.1
*/
#ifdef _USE_MMAP
#if defined ZZIP_HAVE_SYS_MMAN_H
#include <sys/mman.h>
#define USE_POSIX_MMAP 1
#elif defined ZZIP_HAVE_WINBASE_H || defined WIN32
#include <windows.h>
#define USE_WIN32_MMAP 1
#else
#undef _USE_MMAP
#endif
#endif
/* -------------- specify MMAP function imports --------------------------- */
#if defined USE_POSIX_MMAP
#define USE_MMAP 1
#define _zzip_mmap(user, fd, offs, len) \
mmap (0, len, PROT_READ, MAP_SHARED, fd, offs)
#define _zzip_munmap(user, ptr, len) \
munmap (ptr, len)
#define _zzip_getpagesize(user) getpagesize()
#ifndef MAP_FAILED /* hpux10.20 does not have it */
#define MAP_FAILED ((void*)(-1))
#endif
#elif defined USE_WIN32_MMAP
#define USE_MMAP 1
#ifndef MAP_FAILED
#define MAP_FAILED 0
#endif
/* we (ab)use the "*user" variable to store the FileMapping handle */
/* and make sure (sizeof(*user) == sizeof(HANDLE)) */
static size_t win32_getpagesize (void)
{
SYSTEM_INFO si; GetSystemInfo (&si);
return si.dwAllocationGranularity;
}
#ifdef _WIN64
static void* win32_mmap (__int64* user, int fd, zzip_off_t offs, size_t len)
#else
static void* win32_mmap (long* user, int fd, zzip_off_t offs, size_t len)
#endif
{
if (! user || *user != 1) /* || offs % getpagesize() */
return 0;
{
HANDLE hFile = (HANDLE)_get_osfhandle(fd);
if (hFile)
#ifdef _WIN64
*user = (__int64) CreateFileMapping (hFile, 0, PAGE_READONLY, 0, 0, NULL);
#else
*user = (long) CreateFileMapping (hFile, 0, PAGE_READONLY, 0, 0, NULL);
#endif
if (*user)
{
char* p = 0;
p = MapViewOfFile(*(HANDLE*)user, FILE_MAP_READ, 0, offs, len);
if (p) return p + offs;
CloseHandle (*(HANDLE*)user); *user = 1;
}
return MAP_FAILED;
}
}
#ifdef _WIN64
static void win32_munmap (__int64* user, char* fd_map, size_t len)
#else
static void win32_munmap (long* user, char* fd_map, size_t len)
#endif
{
UnmapViewOfFile (fd_map);
CloseHandle (*(HANDLE*)user); *user = 1;
}
#ifdef _WIN64
#define _zzip_mmap(user, fd, offs, len) \
win32_mmap ((__int64*) &(user), fd, offs, len)
#define _zzip_munmap(user, ptr, len) \
win32_munmap ((__int64*) &(user), ptr, len)
#else
#define _zzip_mmap(user, fd, offs, len) \
win32_mmap ((long*) &(user), fd, offs, len)
#define _zzip_munmap(user, ptr, len) \
win32_munmap ((long*) &(user), ptr, len)
#endif
#define _zzip_getpagesize(user) win32_getpagesize()
#else /* disable */
#define USE_MMAP 0
/* USE_MAP is intentional: we expect the compiler to do some "code removal"
* on any source code enclosed in if (USE_MMAP) {...} i.e. the unreachable
* branch of an if (0) {....} is not emitted to the final object binary. */
#ifndef MAP_FAILED
#define MAP_FAILED 0
#endif
#define _zzip_mmap(user, fd, offs, len) (MAP_FAILED)
#define _zzip_munmap(user, ptr, len) {}
#define _zzip_getpagesize(user) 1
#endif /* USE_MMAP defines */
#endif
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