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<?php
/*
Quick & dirty library to read/extract BlitzMax compatible data types from raw input data (files/UDP).
Globals:
- $d: holds the data to read (d for Data)
- $dOS: read offset in bytes (dOS for Data OffSet)
- the normal functions manipulate $d (which is slow), they do not use $dOS
- the fast functions use $dOS to keep track of the read offset, they do not manipulate $d (faster)
*/
function readLine(){
global $d;
$line='';
do {
$char=ord(substr($d,0,1));
$line.=chr($char);
$d=substr($d,1);
} while ($char!=13);
$d=substr($d,1);
return substr($line,0,strlen($line)-1);
}
function readString(){
global $d;
$length=ord(substr($d,0,1));
$string=substr($d,1,$length);
$d=substr($d,$length+1);
return $string;
}
function readByte(){
global $d;
$byte=ord(substr($d,0,1));
$d=substr($d,1);
return $byte;
}
function readShort(){
global $d;
$short=substr($d,0,2);
$d=substr($d,2);
$r=unpack('S',$short);
return $r[1];
}
function readInt(){
global $d;
$int=substr($d,0,4);
$d=substr($d,4);
$r=unpack('l',$int);
return $r[1];
}
function readFloat(){
global $d;
$float=ord(substr($d,0,4));
$d=substr($d,4);
$r=unpack('f',$float);
return $r[1];
}
// Fast versions using an offset ($dOS) instead of manipulating $d
function readLineFast(){
global $d;
global $dOS;
$line='';
do {
$char=ord(substr($d,$dOS,1));
$line.=chr($char);
$dOS++;
} while ($char!=13);
$dOS++;
return substr($line,0,strlen($line)-1);
}
function readStringFast(){
global $d;
global $dOS;
$length=ord(substr($d,$dOS,1));
$string=substr($d,$dOS+1,$length);
$dOS+=($length+1);
return $string;
}
function readByteFast(){
global $d;
global $dOS;
$byte=ord(substr($d,$dOS,1));
$dOS++;
return $byte;
}
function readShortFast(){
global $d;
global $dOS;
$short=substr($d,$dOS,2);
$dOS+=2;
$r=unpack('S',$short);
return $r[1];
}
function readIntFast(){
global $d;
global $dOS;
$int=substr($d,$dOS,4);
$dOS+=4;
$r=unpack('l',$int);
return $r[1];
}
function readFloatFast(){
global $d;
global $dOS;
$float=ord(substr($d,$dOS,4));
$dOS+=4;
$r=unpack('f',$float);
return $r[1];
}
?>
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