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#!/usr/bin/env perl
# $Id: lib_util.pl,v 1.3 2002/09/14 21:07:03 euske Exp $
#
# lib_util.pl - misc. utilities
#
# 2002/2, by 1@2ch
# * public domain *
#
# binary file operation
# read
# wuint8($x);
# wsint8($x);
# wuint16($x);
# wsint16($x);
# wuint24($x);
# wuint32($x);
# wstr32($x);
# wstrn($x);
# wgoto($pos);
# wpos();
# write
# ruint8();
# rsint8();
# ruint16();
# rsint16();
# ruint24();
# ruint32();
# rstr32();
# rstrn($len);
# rgoto($pos);
# rpos();
# rpos_push();
# rpos_pop();
# convert to string
# suint8();
# ssint8();
# suint16();
# ssint16();
# suint24();
# suint32();
# sstr32();
# 32bit ulong add/subtr
# addint($x,$y);
# subint($x,$y);
# get a line skipping comments
# getline(HANDLE);
$BUFSIZ = 1024;
$WPOS = 0;
$RPOS = 0;
@RPOS_STACK = ();
sub wopen($) {
$W_FILE=$_[0];
open(BINOUT, ">$W_FILE") || die("wopen: $W_FILE: $!");
binmode(BINOUT);
}
sub wclose() {
close(BINOUT);
}
sub wuint8($) {
syswrite(BINOUT, pack('C', $_[0]), 1) || &werr();
$WPOS += 1;
}
sub wsint8($) {
$_[0] += 256 if ($_[0] < 0);
syswrite(BINOUT, pack('C', $_[0]), 1) || &werr();
$WPOS += 1;
}
sub wuint16($) {
syswrite(BINOUT, pack('n', $_[0]), 2) || &werr();
$WPOS += 2;
}
sub wsint16($) {
$_[0] += 65536 if ($_[0] < 0);
syswrite(BINOUT, pack('n', $_[0]), 2) || &werr();
$WPOS += 2;
}
sub wuint24($) {
syswrite(BINOUT, substr(pack('N', $_[0]),1), 3) || &werr();
$WPOS += 3;
}
sub wuint32($) {
syswrite(BINOUT, pack('N', $_[0]), 4) || &werr();
$WPOS += 4;
}
sub wstr32($) {
syswrite(BINOUT, $_[0], 4) || &werr();
$WPOS += 4;
}
sub wstrn($) {
(syswrite(BINOUT, $_[0], length($_[0])) == length($_[0])) || &werr();
$WPOS += length($_[0]);
}
sub wgoto($) {
die("illegal seek: $_[0] < $WPOS") if ($_[0] < $WPOS);
my $len = $_[0] - $WPOS;
(syswrite(BINOUT, "\000" x $len, $len) == $len) || &werr();
$WPOS = $_[0];
}
sub wpos() { $WPOS; }
sub ropen($) {
$R_FILE=$_[0];
open(BININ, $R_FILE) || die("ropen: $R_FILE: $!");
binmode(BININ);
}
sub rclose() {
close(BININ);
}
sub ruint8() {
sysread(BININ, $_, 1) || &rerr();
$RPOS += 1;
unpack('C', $_);
}
sub rsint8() {
sysread(BININ, $_, 1) || &rerr();
$RPOS += 1;
my $x = unpack('C', $_);
if (128 <= $x) { $x - 256; } else { $x; }
}
sub ruint16() {
sysread(BININ, $_, 2) || &rerr();
$RPOS += 2;
unpack('n', $_);
}
sub rsint16() {
sysread(BININ, $_, 2) || &rerr();
$RPOS += 2;
my $x = unpack('n', $_);
if (32768 <= $x) { $x - 65536; } else { $x; }
}
sub ruint24() {
sysread(BININ, $_, 3) || &rerr();
$RPOS += 3;
unpack('N', "\000" . $_);
}
sub ruint32() {
sysread(BININ, $_, 4) || &rerr();
$RPOS += 4;
unpack('N', $_);
}
sub rstr32() {
sysread(BININ, $_, 4) || &rerr();
$RPOS += 4;
$_;
}
sub rstrn($) {
my $len = $_[0];
(0 <= sysread(BININ, $_, $len)) || &rerr();
$RPOS += $len;
$_;
}
sub rgoto($) {
sysseek(BININ, $_[0], 0) || die("sysseek: $_[0]: $!");
$RPOS = $_[0];
}
sub rpos() { $RPOS; }
sub rpos_push() {
push(@RPOS_STACK, $RPOS);
}
sub rpos_pop() {
&rgoto(pop(@RPOS_STACK));
}
sub suint8($) {
pack('C', $_[0]);
}
sub ssint8($) {
$_[0] += 256 if ($_[0] < 0);
pack('C', $_[0]);
}
sub suint16($) {
pack('n', $_[0]);
}
sub ssint16($) {
$_[0] += 65536 if ($_[0] < 0);
pack('n', $_[0]);
}
sub suint24($) {
substr(pack('N', $_[0]), 1);
}
sub suint32($) {
pack('N', $_[0]);
}
sub sstr32($) {
substr($_[0] . ' ', 0, 4);
}
sub err($) { print STDERR "$0: $_[0]\n"; }
sub rerr() { die("sysread: $R_FILE($RPOS): $!"); }
sub werr() { die("syswrite: $W_FILE($WPOS): $!"); }
sub addint($$) {
my $x = ($_[0] & 0xffff) + ($_[1] & 0xffff);
my $y = ($_[0] >> 16) + ($_[1] >> 16) + (0x10000 <= $x);
((($y & 0xffff) << 16) | ($x & 0xffff));
}
sub subint($$) {
my $x = ($_[0] & 0xffff | 0x10000) - ($_[1] & 0xffff);
my $y = (($_[0] >> 16) | 0x10000) - ($_[1] >> 16) - ($x < 0x10000);
((($y & 0xffff) << 16) | ($x & 0xffff));
}
sub getline(*) {
my $h = $_[0];
do {
$_ = <$h>;
return $_ if (!$_);
chop;
s/\#.*$//;
} while(/^\s*$/);
$_;
}
1;
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