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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002-2020 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team.
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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "system.h"
#include "error.h"
#include "mfileio.h"
#include "numbers.h"
unsigned char get_unsigned_byte (FILE *file)
{
int ch;
if ((ch = fgetc (file)) < 0)
ERROR ("File ended prematurely\n");
return (unsigned char) ch;
}
void skip_bytes (unsigned int n, FILE *file)
{
while (n-- > 0)
get_unsigned_byte(file);
}
signed char get_signed_byte (FILE *file)
{
int byte;
byte = get_unsigned_byte(file);
if (byte >= 0x80)
byte -= 0x100;
return (signed char) byte;
}
unsigned short get_unsigned_pair (FILE *file)
{
unsigned short pair = get_unsigned_byte(file);
pair = (pair << 8) | get_unsigned_byte(file);
return pair;
}
unsigned short sget_unsigned_pair (unsigned char *s)
{
unsigned short pair = *(s++);
pair = (pair << 8) | *(s++);
return pair;
}
signed short get_signed_pair (FILE *file)
{
signed short pair = get_signed_byte(file);
pair = (pair << 8) | get_unsigned_byte(file);
return pair;
}
unsigned int get_unsigned_triple(FILE *file)
{
int i;
unsigned int triple = 0;
for (i=0; i<3; i++) {
triple = (triple << 8) | get_unsigned_byte(file);
}
return triple;
}
signed int get_signed_triple(FILE *file)
{
int i;
signed int triple = get_signed_byte(file);
for (i=0; i<2; i++) {
triple = (triple << 8) | get_unsigned_byte(file);
}
return triple;
}
int32_t get_signed_quad(FILE *file)
{
int i;
int32_t quad = get_signed_byte(file);
for (i=0; i<3; i++) {
quad = (quad << 8) | get_unsigned_byte(file);
}
return quad;
}
uint32_t get_unsigned_quad(FILE *file)
{
int i;
uint32_t quad = 0;
for (i=0; i<4; i++) {
quad = (quad << 8) | get_unsigned_byte(file);
}
return quad;
}
int32_t get_unsigned_num (FILE *file, unsigned char num)
{
int32_t val = get_unsigned_byte (file);
switch (num) {
case 3: if (val > 0x7f)
val -= 0x100;
val = (val << 8) | get_unsigned_byte (file);
case 2: val = (val << 8) | get_unsigned_byte (file);
case 1: val = (val << 8) | get_unsigned_byte (file);
default: break;
}
return val;
}
/* Compute a signed quad that must be positive */
uint32_t get_positive_quad (FILE *file, const char *type, const char *name)
{
int32_t val = get_signed_quad (file);
if (val < 0)
ERROR ("Bad %s: negative %s: %d", type, name, val);
return (uint32_t)val;
}
int32_t sqxfw (int32_t sq, fixword fw)
{
int sign = 1;
uint32_t a, b, c, d, ad, bd, bc, ac;
uint32_t e, f, g, h, i, j, k;
int32_t result;
/* Make positive. */
if (sq < 0) {
sign = -sign;
sq = -sq;
}
if (fw < 0) {
sign = -sign;
fw = -fw;
}
a = ((uint32_t) sq) >> 16;
b = ((uint32_t) sq) & 0xffffu;
c = ((uint32_t) fw) >> 16;
d = ((uint32_t) fw) & 0xffffu;
ad = a*d; bd = b*d; bc = b*c; ac = a*c;
e = bd >> 16;
f = ad >> 16;
g = ad & 0xffffu;
h = bc >> 16;
i = bc & 0xffffu;
j = ac >> 16;
k = ac & 0xffffu;
result = (e+g+i + (1<<3)) >> 4; /* 1<<3 is for rounding */
result += (f+h+k) << 12;
result += j << 28;
return (sign > 0) ? result : -result;
}
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