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/* $Id: mmap.cpp,v 1.7 2007/07/05 16:05:58 rotmistr Exp $
* ===========================================================================
*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* =========================================================================
*
* Author: Kirill Rotmistrovsky
*
* ========================================================================= */
#include <epcr/mmap.hpp>
#include <stdexcept>
//#include <sstream>
#include <string.h>
#include <errno.h>
USING_NCBI_SCOPE;
USING_SCOPE(EPCR_SCOPE);
#ifndef USE_WIN
CMMap::CMMap(unsigned size, unsigned prot, unsigned flags,
TFileHandle fd, TOffset offset)
{
static unsigned page=sysconf(_SC_PAGESIZE);
offset-=(m_Delta=(offset%page));
m_Data=(char*)mmap64(0,(m_Size=size)+m_Delta,prot,flags,fd,offset);
if(m_Data==0 || m_Data==(char*)-1) {
throw runtime_error("mmap failed: "+string(strerror(errno)));
}
else m_Data+=m_Delta;
}
CMMap::~CMMap() throw()
{
if(m_Data != (char *)-1) munmap(m_Data-m_Delta,m_Size+m_Delta);
}
#else
static string errmsg()
{
char * x;
if(!FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER|
FORMAT_MESSAGE_FROM_SYSTEM|
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(char*)&x,0,NULL)) return "UNKNOWN";
return x?x:"null";
}
CMMap::CMMap(unsigned size, unsigned prot, unsigned flags,
TFileHandle fd, TOffset offset)
{
SYSTEM_INFO si;
GetSystemInfo(&si);
static unsigned page=si.dwAllocationGranularity;
offset-=(m_Delta=(offset%page));
m_Size=size;
m_Map=CreateFileMapping((HANDLE)_get_osfhandle(fd),0,
prot&fProtWrite?PAGE_READWRITE:PAGE_READONLY,
0,0,0);
if(m_Map) {
m_Data=(char*)MapViewOfFile(
m_Map,
flags&fMapPrivate?FILE_MAP_COPY:FILE_MAP_ALL_ACCESS,
offset>>32,offset,size+m_Delta+1);
} else m_Data=0;
if(m_Map==0 || m_Data==0 || m_Data==(char*)-1) {
string err( "mmap failed: " );
err.append( errmsg() );
throw runtime_error( err );
}
else m_Data+=m_Delta;
}
CMMap::~CMMap() throw()
{
if(m_Data != (char *)-1 && m_Data != 0) {
UnmapViewOfFile(m_Data);
CloseHandle(m_Map);
}
}
#endif
/*
* $Log: mmap.cpp,v $
* Revision 1.7 2007/07/05 16:05:58 rotmistr
* Made things compileable by MS Visual C++ 8.0
*
* Revision 1.6 2005/01/27 19:09:13 rotmistr
* Fixed mmap for win32
*
* Revision 1.5 2004/04/06 04:53:18 rotmistr
* All is compileable with BCC5.5 and runnable on WIndows
*
* Revision 1.4 2004/04/01 16:37:41 rotmistr
* Cleaned after adding windows capabilities
*
* Revision 1.3 2004/04/01 05:57:53 rotmistr
* Compilable with borland C++
*
* Revision 1.2 2004/01/06 21:54:19 rotmistr
* Statistics for word repetitions API added
*
* Revision 1.1.1.1 2003/12/23 18:17:27 rotmistr
* Package that includes e-PCR, reverse e-PCR, and sequence data preparation
* program for reverse e-PCR looks ready
*
*/
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