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/*
* This file is part of rsyncrypto - rsync friendly encryption
* Copyright (C) 2005 Shachar Shemesh for Lingnu Open Source Consulting (http://www.lignu.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// Win32 portable implementation
#if !defined(_WIN32)
#error Win32 only header included from non-Win32 build environment
#endif
#ifndef _AUTOMMAP_H
#define _AUTOMMAP_H
#include <errno.h>
#define PROT_READ 0x1
#define PROT_WRITE 0x2
#define MAP_SHARED 0x01
#define MAP_PRIVATE 0x02
// automap will auto-release mmaped areas
class autommap {
HANDLE mapping;
void *ptr;
size_t size;
// Disable default copy constructor
autommap( const autommap & );
void mapfile(void *start, size_t length, int prot, int flags, file_t fd, off_t offset)
{
DWORD flProtect;
DWORD dwDesiredAccess;
ptr=NULL;
mapping=NULL;
switch( prot ) {
case PROT_WRITE|PROT_READ:
flProtect=PAGE_READWRITE;
dwDesiredAccess=FILE_MAP_WRITE;
break;
case PROT_READ:
flProtect=PAGE_READONLY;
dwDesiredAccess=FILE_MAP_READ;
break;
default:
#if defined(EXCEPT_CLASS)
throw EXCEPT_CLASS("Unsupported mmap protection mode");
#else
return;
#endif
}
if( length==0 ) {
DWORD highsize;
length=GetFileSize( fd, &highsize );
if( highsize!=0 )
throw EXCEPT_CLASS("File too big to be mapped", ERROR_NOT_ENOUGH_MEMORY );
}
// If the actual file length is 0, do not map
if( length!=0 ) {
mapping=CreateFileMapping( fd, NULL, flProtect, 0, 0, NULL );
if( mapping==NULL )
throw EXCEPT_CLASS("CreateFileMapping failed", GetLastError() );
ptr=MapViewOfFileEx( mapping, dwDesiredAccess, static_cast<DWORD>(offset>>32),
static_cast<DWORD>(offset), length, start );
if( ptr==NULL ) {
CloseHandle( mapping );
mapping=NULL;
#if defined(EXCEPT_CLASS)
throw EXCEPT_CLASS("mmap failed", errno);
#endif
}
}
size=length;
}
public:
autommap() : ptr(NULL), mapping(NULL), size(0)
{
}
autommap(void *start, size_t length, int prot, int flags, file_t fd, off_t offset ) :
mapping(NULL), ptr(NULL), size(0)
{
mapfile(start, length, prot, flags, fd, offset);
}
// Map an entire file into memory
autommap(file_t fd, int prot) : mapping(NULL), ptr(NULL), size(0)
{
mapfile(NULL, 0, prot, 0, fd, 0);
}
~autommap()
{
clear();
}
void *get() const
{
return ptr;
}
unsigned char *get_uc() const
{
return static_cast<unsigned char *>(ptr);
}
autommap &operator=( autommap &that )
{
clear();
ptr=that.ptr;
mapping=that.mapping;
that.ptr=NULL;
that.mapping=NULL;
return *this;
}
void clear()
{
if( ptr!=NULL ) {
UnmapViewOfFile(ptr);
ptr=NULL;
CloseHandle(mapping);
}
ptr=NULL;
mapping=NULL;
}
size_t getsize() const {
return size;
}
};
#endif // _AUTOMMAP_H
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