umfpack_load_symbolic.c
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/* ========================================================================== */
/* === UMFPACK_load_symbolic ================================================ */
/* ========================================================================== */
/* -------------------------------------------------------------------------- */
/* 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 Symbolic object from a file created by
umfpack_*_save_symbolic.
*/
#include "umf_internal.h"
#include "umf_valid_symbolic.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_symbolic ((void **) &Symbolic) ; \
fclose (f) ; \
return (UMFPACK_ERROR_out_of_memory) ; \
} \
if (fread (object, sizeof (type), n, f) != n) \
{ \
UMFPACK_free_symbolic ((void **) &Symbolic) ; \
fclose (f) ; \
return (UMFPACK_ERROR_file_IO) ; \
} \
if (ferror (f)) \
{ \
UMFPACK_free_symbolic ((void **) &Symbolic) ; \
fclose (f) ; \
return (UMFPACK_ERROR_file_IO) ; \
} \
}
/* ========================================================================== */
/* === UMFPACK_load_symbolic ================================================ */
/* ========================================================================== */
GLOBAL Int UMFPACK_load_symbolic
(
void **SymbolicHandle,
char *user_filename
)
{
SymbolicType *Symbolic ;
char *filename ;
FILE *f ;
*SymbolicHandle = (void *) NULL ;
/* ---------------------------------------------------------------------- */
/* get the filename, or use the default name if filename is NULL */
/* ---------------------------------------------------------------------- */
if (user_filename == (char *) NULL)
{
filename = "symbolic.umf" ;
}
else
{
filename = user_filename ;
}
f = fopen (filename, "rb") ;
if (!f)
{
return (UMFPACK_ERROR_file_IO) ;
}
/* ---------------------------------------------------------------------- */
/* read the Symbolic header from the file, in binary */
/* ---------------------------------------------------------------------- */
Symbolic = (SymbolicType *) UMF_malloc (1, sizeof (SymbolicType)) ;
if (Symbolic == (SymbolicType *) NULL)
{
fclose (f) ;
return (UMFPACK_ERROR_out_of_memory) ;
}
if (fread (Symbolic, sizeof (SymbolicType), 1, f) != 1)
{
(void) UMF_free ((void *) Symbolic) ;
fclose (f) ;
return (UMFPACK_ERROR_file_IO) ;
}
if (ferror (f))
{
(void) UMF_free ((void *) Symbolic) ;
fclose (f) ;
return (UMFPACK_ERROR_file_IO) ;
}
if (Symbolic->valid != SYMBOLIC_VALID || Symbolic->n_row <= 0 ||
Symbolic->n_col <= 0 || Symbolic->nfr < 0 || Symbolic->nchains < 0 ||
Symbolic->esize < 0)
{
/* Symbolic does not point to a Symbolic object */
(void) UMF_free ((void *) Symbolic) ;
fclose (f) ;
return (UMFPACK_ERROR_invalid_Symbolic_object) ;
}
Symbolic->Cperm_init = (Int *) NULL ;
Symbolic->Rperm_init = (Int *) NULL ;
Symbolic->Front_npivcol = (Int *) NULL ;
Symbolic->Front_parent = (Int *) NULL ;
Symbolic->Front_1strow = (Int *) NULL ;
Symbolic->Front_leftmostdesc = (Int *) NULL ;
Symbolic->Chain_start = (Int *) NULL ;
Symbolic->Chain_maxrows = (Int *) NULL ;
Symbolic->Chain_maxcols = (Int *) NULL ;
Symbolic->Cdeg = (Int *) NULL ;
Symbolic->Rdeg = (Int *) NULL ;
Symbolic->Esize = (Int *) NULL ;
Symbolic->Diagonal_map = (Int *) NULL ;
/* umfpack_free_symbolic can now be safely called if an error occurs */
/* ---------------------------------------------------------------------- */
/* read the rest of the Symbolic object */
/* ---------------------------------------------------------------------- */
READ (Symbolic->Cperm_init, Int, Symbolic->n_col+1) ;
READ (Symbolic->Rperm_init, Int, Symbolic->n_row+1) ;
READ (Symbolic->Front_npivcol, Int, Symbolic->nfr+1) ;
READ (Symbolic->Front_parent, Int, Symbolic->nfr+1) ;
READ (Symbolic->Front_1strow, Int, Symbolic->nfr+1) ;
READ (Symbolic->Front_leftmostdesc, Int, Symbolic->nfr+1) ;
READ (Symbolic->Chain_start, Int, Symbolic->nchains+1) ;
READ (Symbolic->Chain_maxrows, Int, Symbolic->nchains+1) ;
READ (Symbolic->Chain_maxcols, Int, Symbolic->nchains+1) ;
READ (Symbolic->Cdeg, Int, Symbolic->n_col+1) ;
READ (Symbolic->Rdeg, Int, Symbolic->n_row+1) ;
if (Symbolic->esize > 0)
{
/* only when dense rows are present */
READ (Symbolic->Esize, Int, Symbolic->esize) ;
}
if (Symbolic->prefer_diagonal)
{
/* only when diagonal pivoting is prefered */
READ (Symbolic->Diagonal_map, Int, Symbolic->n_col+1) ;
}
/* close the file */
fclose (f) ;
/* make sure the Symbolic object is valid */
if (!UMF_valid_symbolic (Symbolic))
{
UMFPACK_free_symbolic ((void **) &Symbolic) ;
return (UMFPACK_ERROR_invalid_Symbolic_object) ;
}
*SymbolicHandle = (void *) Symbolic ;
return (UMFPACK_OK) ;
}