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jiri 2005-02-04 17:23:13 +00:00
parent 6e2727f595
commit 33c17f4f2f
1 changed files with 61 additions and 0 deletions
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auxstorage.h Normal file
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#ifndef _AUXSTORAGE_H_
#define _AUXSTORAGE_H_
#include "laerror.h"
#include "vec.h"
#include "mat.h"
#include "smat.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
template<typename T>
class AuxStorage
{
char filename[16];
int fd;
off64_t recl;
public:
AuxStorage(void);
~AuxStorage(void) {close(fd);};
void get(NRVec<T> &x, const int pos) const;
void put(const NRVec<T> &x, const int pos);
void get(NRMat<T> &x, const int pos) const;
void put(const NRMat<T> &x, const int pos);
void get(NRSMat<T> &x, const int pos) const;
void put(const NRSMat<T> &x, const int pos);
};
template<typename T>
AuxStorage<T>::AuxStorage(void)
{
strcpy(filename,"AuxStorageXXXXXX");
mktemp(filename);
unlink(filename);
fd=open(filename,O_CREAT|O_LARGEFILE);
if(fd<0) {perror(""); laerror("open failed in AuxStorage");}
recl=0;
}
template<typename T>
void AuxStorage<T>::get(NRVec<T> &x, const int pos) const
{
if(recl==0) laerror("get from an empty file in AuxStorage");
if((off64_t)-1 == lseek64(fd,pos*recl,SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
if(recl!=read(fd,&x[0],recl)) {perror(""); laerror("read failed in AuxStorage");}
}
template<typename T>
void AuxStorage<T>::put(const NRVec<T> &x, const int pos) const
{
if(recl) {if(recl!=x.size()*sizeof(T)) laerror("attempt to write objects of different size to one AuxStorage");}
else recl=x.size()*sizeof(T);
if((off64_t)-1 == lseek64(fd,pos*recl,SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
if(0>write(fd,&x[0],recl)) {perror(""); laerror("write failed in AuxStorage");}
}
#endif