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/*
* Copyright (C) 1987-2008 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (C) 2008-2011 Robert Ancell
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 2 of the License, or (at your option) any later
* version. See http://www.gnu.org/copyleft/gpl.html the full text of the
* license.
*/
#include <stdio.h>
#include "mp.h"
#include "mp-private.h"
#include "mp-serializer.h"
// FIXME: Make dynamic
#define MAX_DIGITS 1000
static char digits[] = "0123456789ABCDEF";
static int hex_to_int(char digit)
{
if (digit >= '0' && digit <= '9')
return digit - '0';
if (digit >= 'A' && digit <= 'F')
return digit - 'A' + 10;
if (digit >= 'a' && digit <= 'f')
return digit - 'a' + 10;
return 0;
}
static gchar *
to_hex_string(const MPNumber *x)
{
MpSerializer *serializer;
gchar *result;
serializer = mp_serializer_new(MP_DISPLAY_FORMAT_FIXED, 16, 0);
result = mp_serializer_to_string(serializer, x);
g_object_unref(serializer);
return result;
}
static void
mp_bitwise(const MPNumber *x, const MPNumber *y, int (*bitwise_operator)(int, int), MPNumber *z, int wordlen)
{
char *text1, *text2, text_out[MAX_DIGITS], text_out2[MAX_DIGITS];
int offset1, offset2, offset_out;
text1 = to_hex_string(x);
text2 = to_hex_string(y);
offset1 = strlen(text1) - 1;
offset2 = strlen(text2) - 1;
offset_out = wordlen / 4 - 1;
if (offset_out <= 0) {
offset_out = offset1 > offset2 ? offset1 : offset2;
}
if (offset_out > 0 && (offset_out < offset1 || offset_out < offset2)) {
g_free(text1);
g_free(text2);
mp_set_from_integer(0, z);
mperr("Overflow. Try a bigger word size");
return;
}
/* Perform bitwise operator on each character from right to left */
for (text_out[offset_out+1] = '\0'; offset_out >= 0; offset_out--) {
int v1 = 0, v2 = 0;
if (offset1 >= 0) {
v1 = hex_to_int(text1[offset1]);
offset1--;
}
if (offset2 >= 0) {
v2 = hex_to_int(text2[offset2]);
offset2--;
}
text_out[offset_out] = digits[bitwise_operator(v1, v2)];
}
snprintf(text_out2, MAX_DIGITS, "%s", text_out);
mp_set_from_string(text_out2, 16, z);
g_free(text1);
g_free(text2);
}
static int mp_bitwise_and(int v1, int v2) { return v1 & v2; }
static int mp_bitwise_or(int v1, int v2) { return v1 | v2; }
static int mp_bitwise_xor(int v1, int v2) { return v1 ^ v2; }
static int mp_bitwise_not(int v1, int dummy) { return v1 ^ 0xF; }
bool
mp_is_overflow (const MPNumber *x, int wordlen)
{
MPNumber tmp1, tmp2;
mp_set_from_integer(2, &tmp1);
mp_xpowy_integer(&tmp1, wordlen, &tmp2);
return mp_is_greater_than (&tmp2, x);
}
void
mp_and(const MPNumber *x, const MPNumber *y, MPNumber *z)
{
if (!mp_is_positive_integer(x) || !mp_is_positive_integer(y))
{
/* Translators: Error displayed when boolean AND attempted on non-integer values */
mperr(_("Boolean AND is only defined for positive integers"));
}
mp_bitwise(x, y, mp_bitwise_and, z, 0);
}
void
mp_or(const MPNumber *x, const MPNumber *y, MPNumber *z)
{
if (!mp_is_positive_integer(x) || !mp_is_positive_integer(y))
{
/* Translators: Error displayed when boolean OR attempted on non-integer values */
mperr(_("Boolean OR is only defined for positive integers"));
}
mp_bitwise(x, y, mp_bitwise_or, z, 0);
}
void
mp_xor(const MPNumber *x, const MPNumber *y, MPNumber *z)
{
if (!mp_is_positive_integer(x) || !mp_is_positive_integer(y))
{
/* Translators: Error displayed when boolean XOR attempted on non-integer values */
mperr(_("Boolean XOR is only defined for positive integers"));
}
mp_bitwise(x, y, mp_bitwise_xor, z, 0);
}
void
mp_not(const MPNumber *x, int wordlen, MPNumber *z)
{
MPNumber temp;
if (!mp_is_positive_integer(x))
{
/* Translators: Error displayed when boolean NOT attempted on non-integer values */
mperr(_("Boolean NOT is only defined for positive integers"));
}
mp_set_from_integer(0, &temp);
mp_bitwise(x, &temp, mp_bitwise_not, z, wordlen);
}
void
mp_shift(const MPNumber *x, int count, MPNumber *z)
{
int i;
MPNumber multiplier;
mp_set_from_integer(1, &multiplier);
if (!mp_is_integer(x)) {
/* Translators: Error displayed when bit shift attempted on non-integer values */
mperr(_("Shift is only possible on integer values"));
return;
}
if (count >= 0) {
for (i = 0; i < count; i++)
mp_multiply_integer(&multiplier, 2, &multiplier);
mp_multiply(x, &multiplier, z);
}
else {
for (i = 0; i < -count; i++)
mp_multiply_integer(&multiplier, 2, &multiplier);
mp_divide(x, &multiplier, z);
mp_floor(z, z);
}
}
void
mp_ones_complement(const MPNumber *x, int wordlen, MPNumber *z)
{
MPNumber t;
mp_set_from_integer(0, &t);
mp_bitwise(x, &t, mp_bitwise_xor, z, wordlen);
mp_not(z, wordlen, z);
}
void
mp_twos_complement(const MPNumber *x, int wordlen, MPNumber *z)
{
mp_ones_complement (x, wordlen, z);
mp_add_integer (z, 1, z);
}
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