jiri/LA_library
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jiri 2005-02-04 18:09:16 +00:00
parent 33c17f4f2f
commit 1b602fe7a2
1 changed files with 13 additions and 9 deletions
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22
auxstorage.h
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@ -11,16 +11,20 @@
#include <fcntl.h> #include <fcntl.h>
#include <unistd.h> #include <unistd.h>
//CAUTION:
//it will not work if T is itself a class with dynamically allocated components
//it cannot be implemented for SparseMat, which lacks fixed record length
template<typename T> template<typename T>
class AuxStorage class AuxStorage
{ {
char filename[16]; char filename[32];
int fd; int fd;
off64_t recl; size_t recl;
public: public:
AuxStorage(void); AuxStorage(void);
~AuxStorage(void) {close(fd);}; ~AuxStorage(void) {close(fd); unlink(filename);};
void get(NRVec<T> &x, const int pos) const; void get(NRVec<T> &x, const int pos) const;
void put(const NRVec<T> &x, const int pos); void put(const NRVec<T> &x, const int pos);
void get(NRMat<T> &x, const int pos) const; void get(NRMat<T> &x, const int pos) const;
@ -32,10 +36,10 @@ public:
template<typename T> template<typename T>
AuxStorage<T>::AuxStorage(void) AuxStorage<T>::AuxStorage(void)
{ {
strcpy(filename,"AuxStorageXXXXXX"); strcpy(filename,"AUX_XXXXXX");
mktemp(filename); mktemp(filename);
unlink(filename); unlink(filename);
fd=open(filename,O_CREAT|O_LARGEFILE); fd=open(filename,O_CREAT|O_LARGEFILE|O_RDWR,0777);
if(fd<0) {perror(""); laerror("open failed in AuxStorage");} if(fd<0) {perror(""); laerror("open failed in AuxStorage");}
recl=0; recl=0;
} }
@ -44,16 +48,16 @@ template<typename T>
void AuxStorage<T>::get(NRVec<T> &x, const int pos) const void AuxStorage<T>::get(NRVec<T> &x, const int pos) const
{ {
if(recl==0) laerror("get from an empty file in AuxStorage"); 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((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
if(recl!=read(fd,&x[0],recl)) {perror(""); laerror("read failed in AuxStorage");} if((ssize_t)recl!=read(fd,&x[0],recl)) {perror(""); laerror("read failed in AuxStorage");}
} }
template<typename T> template<typename T>
void AuxStorage<T>::put(const NRVec<T> &x, const int pos) const void AuxStorage<T>::put(const NRVec<T> &x, const int pos)
{ {
if(recl) {if(recl!=x.size()*sizeof(T)) laerror("attempt to write objects of different size to one AuxStorage");} 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); else recl=x.size()*sizeof(T);
if((off64_t)-1 == lseek64(fd,pos*recl,SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");} if((off64_t)-1 == lseek64(fd,pos*((off64_t)recl),SEEK_SET)) {perror(""); laerror("seek failed in AuxStorage");}
if(0>write(fd,&x[0],recl)) {perror(""); laerror("write failed in AuxStorage");} if(0>write(fd,&x[0],recl)) {perror(""); laerror("write failed in AuxStorage");}
} }