142 lines
4.7 KiB
C++
142 lines
4.7 KiB
C++
/*
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LA: linear algebra C++ interface library
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Copyright (C) 2008 Jiri Pittner <jiri.pittner@jh-inst.cas.cz> or <jiri@pittnerovi.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _AUXSTORAGE_H_
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#define _AUXSTORAGE_H_
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#include "vec.h"
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#include "mat.h"
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#include "smat.h"
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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//CAUTION:
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//it will not work if T is itself a class with dynamically allocated components
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//it cannot be implemented for SparseMat, which lacks fixed record length
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//for more complex I/O use put() and get() methods of the individual classes
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template<typename T>
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class AuxStorage
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{
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char filename[32];
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int fd;
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bool deleteme;
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size_t recl;
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public:
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AuxStorage(void);
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AuxStorage(const char *name);
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~AuxStorage(void) {close(fd); if(deleteme) unlink(filename);};
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void get(NRVec<T> &x, const int pos) const;
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void put(const NRVec<T> &x, const int pos);
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void get(NRMat<T> &x, const int pos) const;
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void put(const NRMat<T> &x, const int pos);
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void get(NRSMat<T> &x, const int pos) const;
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void put(const NRSMat<T> &x, const int pos);
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};
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template<typename T>
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AuxStorage<T>::AuxStorage(void)
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{
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//mkstemp probable does not support O_LARGEFILE?!
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strcpy(filename,"AUX_XXXXXX");
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mktemp(filename);
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unlink(filename);
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fd=open(filename,O_CREAT|O_LARGEFILE|O_RDWR,0777);
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if(fd<0) {perror(""); laerror("open failed in AuxStorage");}
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recl=0;
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deleteme=1;
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}
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template<typename T>
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AuxStorage<T>::AuxStorage(const char *name)
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{
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strcpy(filename,name);
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unlink(filename);
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fd=open(filename,O_CREAT|O_LARGEFILE|O_RDWR,0777);
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if(fd<0) {perror(""); laerror("open failed in AuxStorage");}
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recl=0;
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deleteme=0;
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}
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//vectors
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template<typename T>
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void AuxStorage<T>::get(NRVec<T> &x, const int pos) const
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{
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if(recl==0) laerror("get from an empty file in AuxStorage");
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if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
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x.copyonwrite();
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if((ssize_t)recl!=read(fd,&x[0],recl)) {perror(""); laerror("read failed in AuxStorage");}
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}
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template<typename T>
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void AuxStorage<T>::put(const NRVec<T> &x, const int pos)
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{
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if(recl) {if(recl!=x.size()*sizeof(T)) laerror("attempt to write objects of different size to one AuxStorage");}
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else recl=x.size()*sizeof(T);
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if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
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if(0>write(fd,&x[0],recl)) {perror(""); laerror("write failed in AuxStorage");}
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}
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//matrices
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template<typename T>
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void AuxStorage<T>::get(NRMat<T> &x, const int pos) const
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{
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if(recl==0) laerror("get from an empty file in AuxStorage");
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if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
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x.copyonwrite();
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if((ssize_t)recl!=read(fd,&x(0,0),recl)) {perror(""); laerror("read failed in AuxStorage");}
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}
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template<typename T>
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void AuxStorage<T>::put(const NRMat<T> &x, const int pos)
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{
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if(recl) {if(recl!=x.nrows()*x.ncols()*sizeof(T)) laerror("attempt to write objects of different size to one AuxStorage");}
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else recl=x.nrows()*x.ncols()*sizeof(T);
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if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
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if(0>write(fd,&x(0,0),recl)) {perror(""); laerror("write failed in AuxStorage");}
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}
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//packed symmetric matrices
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template<typename T>
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void AuxStorage<T>::get(NRSMat<T> &x, const int pos) const
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{
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if(recl==0) laerror("get from an empty file in AuxStorage");
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if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
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x.copyonwrite();
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if((ssize_t)recl!=read(fd,&x(0,0),recl)) {perror(""); laerror("read failed in AuxStorage");}
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}
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template<typename T>
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void AuxStorage<T>::put(const NRSMat<T> &x, const int pos)
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{
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if(recl) {if(recl!=x.nrows()*(x.nrows()+1)/2*sizeof(T)) laerror("attempt to write objects of different size to one AuxStorage");}
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else recl=x.nrows()*(x.nrows()+1)/2*sizeof(T);
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if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
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if(0>write(fd,&x(0,0),recl)) {perror(""); laerror("write failed in AuxStorage");}
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}
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#endif
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