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fvn_sparse/UMFPACK/Source/umfpack_load_numeric.c 4.97 KB
422234dc3   daniau   git-svn-id: https...
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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) ;
  }