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/* $Header: /home/cvsroot/dvipdfmx/src/numbers.c,v 1.9 2008/11/30 21:12:27 matthias Exp $
This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team <dvipdfmx@project.ktug.or.kr>
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "system.h"
#include "error.h"
#include "mfileio.h"
#include "numbers.h"
UNSIGNED_BYTE get_unsigned_byte (FILE *file)
{
int ch;
if ((ch = fgetc (file)) < 0)
ERROR ("File ended prematurely\n");
return (UNSIGNED_BYTE) ch;
}
#if 0
UNSIGNED_BYTE sget_unsigned_byte (char *s)
{
return *((unsigned char *) s);
}
#endif
SIGNED_BYTE get_signed_byte (FILE *file)
{
int byte;
byte = get_unsigned_byte(file);
if (byte >= 0x80)
byte -= 0x100;
return (SIGNED_BYTE) byte;
}
UNSIGNED_PAIR get_unsigned_pair (FILE *file)
{
int i;
UNSIGNED_BYTE byte;
UNSIGNED_PAIR pair = 0;
for (i=0; i<2; i++) {
byte = get_unsigned_byte(file);
pair = pair*0x100u + byte;
}
return pair;
}
UNSIGNED_PAIR sget_unsigned_pair (unsigned char *s)
{
int i;
UNSIGNED_BYTE byte;
UNSIGNED_PAIR pair = 0;
for (i=0; i<2; i++) {
byte = *(s++);
pair = pair*0x100u + byte;
}
return pair;
}
SIGNED_PAIR get_signed_pair (FILE *file)
{
int i;
long pair = 0;
for (i=0; i<2; i++) {
pair = pair*0x100 + get_unsigned_byte(file);
}
if (pair >= 0x8000) {
pair -= 0x10000l;
}
return (SIGNED_PAIR) pair;
}
UNSIGNED_TRIPLE get_unsigned_triple(FILE *file)
{
int i;
long triple = 0;
for (i=0; i<3; i++) {
triple = triple*0x100u + get_unsigned_byte(file);
}
return (UNSIGNED_TRIPLE) triple;
}
SIGNED_TRIPLE get_signed_triple(FILE *file)
{
int i;
long triple = 0;
for (i=0; i<3; i++) {
triple = triple*0x100 + get_unsigned_byte(file);
}
if (triple >= 0x800000l)
triple -= 0x1000000l;
return (SIGNED_TRIPLE) triple;
}
SIGNED_QUAD get_signed_quad(FILE *file)
{
int byte, i;
long quad = 0;
/* Check sign on first byte before reading others */
byte = get_unsigned_byte(file);
quad = byte;
if (quad >= 0x80)
quad = byte - 0x100;
for (i=0; i<3; i++) {
quad = quad*0x100 + get_unsigned_byte(file);
}
return (SIGNED_QUAD) quad;
}
UNSIGNED_QUAD get_unsigned_quad(FILE *file)
{
int i;
unsigned long quad = 0;
for (i=0; i<4; i++) {
quad = quad*0x100u + get_unsigned_byte(file);
}
return (UNSIGNED_QUAD) quad;
}
SIGNED_QUAD sqxfw (SIGNED_QUAD sq, fixword fw)
{
int sign = 1;
unsigned long a, b, c, d, ad, bd, bc, ac;
unsigned long e, f, g, h, i, j, k;
unsigned long result;
/* Make positive. */
if (sq < 0) {
sign = -sign;
sq = -sq;
}
if (fw < 0) {
sign = -sign;
fw = -fw;
}
a = ((unsigned long) sq) >> 16u;
b = ((unsigned long) sq) & 0xffffu;
c = ((unsigned long) fw) >> 16u;
d = ((unsigned long) fw) & 0xffffu;
ad = a*d; bd = b*d; bc = b*c; ac = a*c;
e = bd >> 16u;
f = ad >> 16u;
g = ad & 0xffffu;
h = bc >> 16u;
i = bc & 0xffffu;
j = ac >> 16u;
k = ac & 0xffffu;
result = (e+g+i + (1<<3)) >> 4u; /* 1<<3 is for rounding */
result += (f+h+k) << 12u;
result += j << 28u;
return (sign > 0) ? result : result * -1L;
}
#if 0
SIGNED_QUAD axboverc (SIGNED_QUAD n1, SIGNED_QUAD n2, SIGNED_QUAD divide)
{
int sign = 1;
unsigned long a, b, c, d, ad, bd, bc, ac, e, f, g, h, i, j, o;
unsigned long high, low;
SIGNED_QUAD result = 0;
/* Make positive. */
if (n1 < 0) {
sign = -sign;
n1 = -n1;
}
if (n2 < 0) {
sign = -sign;
n2 = -n2;
}
if (divide < 0) {
sign = -sign;
divide = -divide;
}
a = ((unsigned long) n1) >> 16u;
b = ((unsigned long) n1) & 0xffffu;
c = ((unsigned long) n2) >> 16u;
d = ((unsigned long) n2) & 0xffffu;
ad = a*d; bd = b*d; bc = b*c; ac = a*c;
e = bd >> 16u; f = bd & 0xffffu;
g = ad >> 16u; h = ad & 0xffffu;
i = bc >> 16u; j = bc & 0xffffu;
o = e+h+j;
high = g+i+(o>>16u)+ac; o &= 0xffffu;
low = (o << 16) + f;
if (high >= divide)
ERROR ("Overflow in axboc");
{
int k;
for (k=0; k<32; k++) {
high *= 2;
result *= 2;
if (low >= 0x80000000) {
low -= 0x80000000;
high += 1;
}
low *= 2;
if (high > divide) {
high -= divide;
result += 1;
}
}
}
high *= 2;
if (high >= divide)
result += 1;
return (sign>0)?result:-result;
}
#endif
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