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fvn_sparse/UMFPACK/Source/umfpack_load_numeric.c
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/* ========================================================================== */
/* === UMFPACK_load_numeric ================================================= */
/* ========================================================================== */
/* -------------------------------------------------------------------------- */
/* UMFPACK Copyright (c) Timothy A. Davis, CISE, */
/* Univ. of Florida. All Rights Reserved. See ../Doc/License for License. */
/* web: http://www.cise.ufl.edu/research/sparse/umfpack */
/* -------------------------------------------------------------------------- */
/*
User-callable. Loads a Numeric object from a file created by
umfpack_*_save_numeric.
*/
#include "umf_internal.h"
#include "umf_valid_numeric.h"
#include "umf_malloc.h"
#include "umf_free.h"
#define READ(object,type,n) \
{ \
object = (type *) UMF_malloc (n, sizeof (type)) ; \
if (object == (type *) NULL) \
{ \
UMFPACK_free_numeric ((void **) &Numeric) ; \
fclose (f) ; \
return (UMFPACK_ERROR_out_of_memory) ; \
} \
if (fread (object, sizeof (type), n, f) != n) \
{ \
UMFPACK_free_numeric ((void **) &Numeric) ; \
fclose (f) ; \
return (UMFPACK_ERROR_file_IO) ; \
} \
if (ferror (f)) \
{ \
UMFPACK_free_numeric ((void **) &Numeric) ; \
fclose (f) ; \
return (UMFPACK_ERROR_file_IO) ; \
} \
}
/* ========================================================================== */
/* === UMFPACK_load_numeric ================================================= */
/* ========================================================================== */
GLOBAL Int UMFPACK_load_numeric
(
void **NumericHandle,
char *user_filename
)
{
NumericType *Numeric ;
char *filename ;
FILE *f ;
*NumericHandle = (void *) NULL ;
/* ---------------------------------------------------------------------- */
/* get the filename, or use the default name if filename is NULL */
/* ---------------------------------------------------------------------- */
if (user_filename == (char *) NULL)
{
filename = "numeric.umf" ;
}
else
{
filename = user_filename ;
}
f = fopen (filename, "rb") ;
if (!f)
{
return (UMFPACK_ERROR_file_IO) ;
}
/* ---------------------------------------------------------------------- */
/* read the Numeric header from the file, in binary */
/* ---------------------------------------------------------------------- */
Numeric = (NumericType *) UMF_malloc (1, sizeof (NumericType)) ;
if (Numeric == (NumericType *) NULL)
{
fclose (f) ;
return (UMFPACK_ERROR_out_of_memory) ;
}
if (fread (Numeric, sizeof (NumericType), 1, f) != 1)
{
(void) UMF_free ((void *) Numeric) ;
fclose (f) ;
return (UMFPACK_ERROR_file_IO) ;
}
if (ferror (f))
{
(void) UMF_free ((void *) Numeric) ;
fclose (f) ;
return (UMFPACK_ERROR_file_IO) ;
}
if (Numeric->valid != NUMERIC_VALID || Numeric->n_row <= 0 ||
Numeric->n_col <= 0 || Numeric->npiv < 0 || Numeric->ulen < 0 ||
Numeric->size <= 0)
{
/* Numeric does not point to a NumericType object */
(void) UMF_free ((void *) Numeric) ;
fclose (f) ;
return (UMFPACK_ERROR_invalid_Numeric_object) ;
}
Numeric->D = (Entry *) NULL ;
Numeric->Rperm = (Int *) NULL ;
Numeric->Cperm = (Int *) NULL ;
Numeric->Lpos = (Int *) NULL ;
Numeric->Lilen = (Int *) NULL ;
Numeric->Lip = (Int *) NULL ;
Numeric->Upos = (Int *) NULL ;
Numeric->Uilen = (Int *) NULL ;
Numeric->Uip = (Int *) NULL ;
Numeric->Rs = (double *) NULL ;
Numeric->Memory = (Unit *) NULL ;
Numeric->Upattern = (Int *) NULL ;
/* umfpack_free_numeric can now be safely called if an error occurs */
/* ---------------------------------------------------------------------- */
/* read the rest of the Numeric object */
/* ---------------------------------------------------------------------- */
READ (Numeric->D, Entry, MIN (Numeric->n_row, Numeric->n_col)+1) ;
READ (Numeric->Rperm, Int, Numeric->n_row+1) ;
READ (Numeric->Cperm, Int, Numeric->n_col+1) ;
READ (Numeric->Lpos, Int, Numeric->npiv+1) ;
READ (Numeric->Lilen, Int, Numeric->npiv+1) ;
READ (Numeric->Lip, Int, Numeric->npiv+1) ;
READ (Numeric->Upos, Int, Numeric->npiv+1) ;
READ (Numeric->Uilen, Int, Numeric->npiv+1) ;
READ (Numeric->Uip, Int, Numeric->npiv+1) ;
if (Numeric->scale != UMFPACK_SCALE_NONE)
{
READ (Numeric->Rs, double, Numeric->n_row) ;
}
if (Numeric->ulen > 0)
{
READ (Numeric->Upattern, Int, Numeric->ulen+1) ;
}
READ (Numeric->Memory, Unit, Numeric->size) ;
/* close the file */
fclose (f) ;
/* make sure the Numeric object is valid */
if (!UMF_valid_numeric (Numeric))
{
UMFPACK_free_numeric ((void **) &Numeric) ;
return (UMFPACK_ERROR_invalid_Numeric_object) ;
}
*NumericHandle = (void *) Numeric ;
return (UMFPACK_OK) ;
}
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