/*
---------------------------------------------------
purpose -- allocate a int array with size entries
and fill with value ival
return value -- a pointer to the start of the array
created : 95sep22, cca
---------------------------------------------------
*/
int *
IVinit (
int size,
int ival
) {
int *y = NULL ;
if ( size > 0 ) {
y = IVinit2(size) ;
IVfill(size, y, ival) ;
}
return(y) ; }
/*
------------------------------
purpose -- to permute a vector
y[*] := y[index[*]]
created -- 95sep22, cca
------------------------------
*/
void
IVperm (
int size,
int y[],
int index[]
) {
if ( size > 0 ) {
if ( y == NULL || index == NULL ) {
fprintf(stderr, "\n fatal error in IVperm, invalid data"
"\n size = %d, y = %p, index = %p\n",
size, y, index) ;
exit(-1) ;
} else {
int *x ;
int i ;
x = IVinit2(size) ;
IVcopy(size, x, y) ;
for ( i = 0 ; i < size ; i++ ) {
y[i] = x[index[i]] ;
}
IVfree(x) ;
}
}
return ; }
/*
----------------------------------------------------
purpose -- to read a Graph object from a binary file
return value -- 1 if success, 0 if failure
created -- 95sep29, cca
----------------------------------------------------
*/
int
Graph_readFromBinaryFile (
Graph *graph,
FILE *fp
) {
int nedges, nvbnd, nvtx, rc, totewght, totvwght, type ;
int itemp[6] ;
int *vwghts ;
IVL *adjIVL, *ewghtIVL ;
/*
---------------
check the input
---------------
*/
if ( graph == NULL || fp == NULL ) {
fprintf(stderr, "\n fatal error in Graph_readFromBinaryFile(%p,%p)"
"\n bad input\n", graph, fp) ;
return(0) ;
}
/*
---------------------
clear the data fields
---------------------
*/
Graph_clearData(graph) ;
/*
---------------------------------------------
read in the six scalar parameters
type, nvtx, nvbnd, nedges, totvwght, totewght
---------------------------------------------
*/
if ( (rc = fread((void *) itemp, sizeof(int), 6, fp)) != 6 ) {
fprintf(stderr, "\n error in Graph_readFromBinaryFile(%p,%p)"
"\n %d items of %d read\n", graph, fp, rc, 6) ;
return(0) ;
}
type = itemp[0] ;
nvtx = itemp[1] ;
nvbnd = itemp[2] ;
nedges = itemp[3] ;
totvwght = itemp[4] ;
totewght = itemp[5] ;
/*
--------------------------------------------------
create the adjIVL IVL object,
set its type to IVL_CHUNKED, then read in its data
--------------------------------------------------
*/
adjIVL = IVL_new() ;
IVL_setDefaultFields(adjIVL) ;
adjIVL->type = IVL_CHUNKED ;
rc = IVL_readFromBinaryFile(adjIVL, fp) ;
if ( rc != 1 ) {
fprintf(stderr, "\n error in Graph_readFromBinaryFile(%p,%p)"
"\n trying to read in adjIVL"
"\n return code %d from IVL_readBinaryFile(%p,%p)",
graph, fp, rc, adjIVL, fp) ;
return(0) ;
}
if ( type % 2 == 1 ) {
int nvtot, wght ;
/*
--------------------------
vertex weights are present
--------------------------
*/
nvtot = nvtx + nvbnd ;
vwghts = IVinit2(nvtot) ;
if ( (rc = fread((void *) vwghts, sizeof(int), nvtot, fp)) != nvtot){
fprintf(stderr, "\n error in Graph_readFromBinaryFile(%p,%p)"
"\n %d items of %d read\n", graph, fp, rc, nvtx+nvbnd) ;
return(0) ;
}
wght = IVsum(nvtot, vwghts) ;
if ( wght != totvwght ) {
fprintf(stderr, "\n error in Graph_readFromBinaryFile(%p,%p)"
"\n totvwght = %d, IVsum(vwghts) = %d\n",
graph, fp, totvwght, wght) ;
return(0) ;
}
} else {
vwghts = NULL ;
}
if ( type > 2 ) {
int wght ;
/*
-----------------------------------------------------
edge weights are present, create the ewghtIVL object,
set its type to IVL_CHUNKED, then read in its data
-----------------------------------------------------
*/
ewghtIVL = IVL_new() ;
IVL_setDefaultFields(ewghtIVL) ;
ewghtIVL->type = IVL_CHUNKED ;
rc = IVL_readFromBinaryFile(ewghtIVL, fp) ;
if ( rc != 1 ) {
fprintf(stderr, "\n error in Graph_readFromBinaryFile(%p,%p)"
"\n trying to read in ewghtIVL"
"\n return code %d from IVL_readBinaryFile(%p,%p)",
graph, fp, rc, ewghtIVL, fp) ;
return(0) ;
}
wght = IVL_sum(ewghtIVL) ;
if ( wght != totewght ) {
fprintf(stderr, "\n error in Graph_readFromBinaryFile(%p,%p)"
"\n totewght = %d, IVL_sum(ewghtIVL) = %d\n",
graph, fp, totewght, wght) ;
return(0) ;
}
} else {
ewghtIVL = NULL ;
}
/*
---------------------
initialize the object
---------------------
*/
Graph_init2(graph, type, nvtx, nvbnd, nedges, totvwght, totewght,
adjIVL, vwghts, ewghtIVL) ;
return(1) ; }
