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/*
*----------------------------------------------------------------------
*
* tclTomMathInterface.c --
*
* This file contains procedures that are used as a 'glue' layer between
* Tcl and libtommath.
*
* Copyright (c) 2005 by Kevin B. Kenny. All rights reserved.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclTomMathInterface.c,v 1.5 2005/10/13 00:14:38 dgp Exp $
*/
#include "tclInt.h"
#include "tommath.h"
#include <limits.h>
/*
*----------------------------------------------------------------------
*
* TclBNAlloc --
*
* Allocate memory for libtommath.
*
* Results:
* Returns a pointer to the allocated block.
*
* This procedure is a wrapper around Tcl_Alloc, needed because of a
* mismatched type signature between Tcl_Alloc and malloc.
*
*----------------------------------------------------------------------
*/
extern void *
TclBNAlloc(
size_t x)
{
return (void *) Tcl_Alloc((unsigned int) x);
}
/*
*----------------------------------------------------------------------
*
* TclBNRealloc --
*
* Change the size of an allocated block of memory in libtommath
*
* Results:
* Returns a pointer to the allocated block.
*
* This procedure is a wrapper around Tcl_Realloc, needed because of a
* mismatched type signature between Tcl_Realloc and realloc.
*
*----------------------------------------------------------------------
*/
extern void *
TclBNRealloc(
void *p,
size_t s)
{
return (void *) Tcl_Realloc((char *) p, (unsigned int) s);
}
/*
*----------------------------------------------------------------------
*
* TclBNFree --
*
* Free allocated memory in libtommath.
*
* Results:
* None.
*
* Side effects:
* Memory is freed.
*
* This function is simply a wrapper around Tcl_Free, needed in libtommath
* because of a type mismatch between free and Tcl_Free.
*
*----------------------------------------------------------------------
*/
extern void
TclBNFree(
void *p)
{
Tcl_Free((char *) p);
}
/*
*----------------------------------------------------------------------
*
* TclBNInitBignumFromLong --
*
* Allocate and initialize a 'bignum' from a native 'long'.
*
* Results:
* None.
*
* Side effects:
* The 'bignum' is constructed.
*
*----------------------------------------------------------------------
*/
extern void
TclBNInitBignumFromLong(
mp_int *a,
long initVal)
{
int status;
unsigned long v;
mp_digit* p;
/*
* Allocate enough memory to hold the largest possible long
*/
status = mp_init_size(a,
(CHAR_BIT * sizeof(long) + DIGIT_BIT - 1) / DIGIT_BIT);
if (status != MP_OKAY) {
Tcl_Panic("initialization failure in TclBNInitBignumFromLong");
}
/*
* Convert arg to sign and magnitude.
*/
if (initVal < 0) {
a->sign = MP_NEG;
v = -initVal;
} else {
a->sign = MP_ZPOS;
v = initVal;
}
/*
* Store the magnitude in the bignum.
*/
p = a->dp;
while (v) {
*p++ = (mp_digit) (v & MP_MASK);
v >>= MP_DIGIT_BIT;
}
a->used = p - a->dp;
}
/*
*----------------------------------------------------------------------
*
* TclBNInitBignumFromWideInt --
*
* Allocate and initialize a 'bignum' from a Tcl_WideInt
*
* Results:
* None.
*
* Side effects:
* The 'bignum' is constructed.
*
*----------------------------------------------------------------------
*/
extern void
TclBNInitBignumFromWideInt(
mp_int *a, /* Bignum to initialize */
Tcl_WideInt v) /* Initial value */
{
if (v < (Tcl_WideInt)0) {
TclBNInitBignumFromWideUInt(a, (Tcl_WideUInt)(-v));
mp_neg(a, a);
} else {
TclBNInitBignumFromWideUInt(a, (Tcl_WideUInt)v);
}
}
/*
*----------------------------------------------------------------------
*
* TclBNInitBignumFromWideUInt --
*
* Allocate and initialize a 'bignum' from a Tcl_WideUInt
*
* Results:
* None.
*
* Side effects:
* The 'bignum' is constructed.
*
*----------------------------------------------------------------------
*/
extern void
TclBNInitBignumFromWideUInt(
mp_int *a, /* Bignum to initialize */
Tcl_WideUInt v) /* Initial value */
{
int status;
mp_digit *p;
/*
* Allocate enough memory to hold the largest possible Tcl_WideUInt.
*/
status = mp_init_size(a,
(CHAR_BIT * sizeof(Tcl_WideUInt) + DIGIT_BIT - 1) / DIGIT_BIT);
if (status != MP_OKAY) {
Tcl_Panic("initialization failure in TclBNInitBignumFromWideUInt");
}
a->sign = MP_ZPOS;
/*
* Store the magnitude in the bignum.
*/
p = a->dp;
while (v) {
*p++ = (mp_digit) (v & MP_MASK);
v >>= MP_DIGIT_BIT;
}
a->used = p - a->dp;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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