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  Classes of Cesar D. Rodas  >  Binary serialization  >  bserialize.php  >  Download  
File: bserialize.php
Role: Class source
Content type: text/plain
Description: Main class
Class: Binary serialization
Serialize and unserialize values in binary format
Author: By
Last change: * Fixing PHP4 bug: It doesn't support by reference optional variable
Date: 5 years ago
Size: 9,198 bytes
 

Contents

Class file image Download
<?php
/**
 * Copyright (c) 2009, PHPServer
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Cesar Rodas nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CESAR RODAS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL CESAR RODAS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
if (defined("_BSERIALIZE"))  {
    return;
}
define("_BSERIALIZE",dirname(__FILE__));
include(
_BSERIALIZE."/error.php");

define("V_ZERO",             0x01);
/* integers */
define("V_1INT_POS",         0x10);
define("V_1INT_NEG",         0x11);
define("V_2INT_POS",         0x12);
define("V_2INT_NEG",         0x13);
define("V_4INT_POS",         0x14);
define("V_4INT_NEG",         0x15);
/* floats  */
define("V_FLOAT_POS",       0x20);
define("V_FLOAT_NEG",       0x21);
/* boolean */
define("V_BOOL_TRUE",       0x30);      
define("V_BOOL_FALSE",      0x31);      
/* array */
define("V_ARRAY",           0x40);      
/* object */
define("V_OBJECT",          0x50);      
/* string */
define("V_STRING",           0x60);

class 
bserialize {
    function 
bserialize() {
    }

    function 
unserialize(&$var) {
        
$i=0;
        return 
$this->_unserialize($var,false,$i);
    }

    function 
_unserialize(&$var,$just_first=false,&$start) {
        
$len strlen($var);
        
$out null;
        for(
$i = &$start$i $len$i++) {
            
$type ord($var[$i++]);
            switch (
$type) {
                case 
V_ZERO:
                    
$out 0;
                    break;
                case 
V_1INT_POS:
                case 
V_1INT_NEG:
                    
$out ord($var[$i]);
                    if (
$type==V_1INT_NEG$out *= -1;
                    
$i++;
                    break;
                case 
V_2INT_POS:
                case 
V_2INT_NEG:
                    
$out $this->__toint(substr($var,$i,2),2);
                    if (
$type == V_2INT_NEG$out *= -1;
                    
$i += 2;
                    break;
                case 
V_4INT_POS:
                case 
V_4INT_NEG:
                    
$out $this->__toint(substr($var,$i,4),4);
                    if (
$type == V_4INT_NEG$out *= -1;
                    
$i += 4;
                    break;
                case 
V_FLOAT_POS:
                case 
V_FLOAT_NEG:
                    
$out $this->__tofloat(substr($var,$i,6));
                    if (
$type == V_FLOAT_NEG$out *= -1;
                    
$i += 6;
                    break;
                case 
V_BOOL_TRUE:
                    
$out true;
                    break;
                case 
V_BOOL_FALSE:
                    
$out false;
                    break;
                case 
V_STRING:
                    
$xlen $this->_unserialize($var,true,$i);
                    if (!
is_numeric($xlen)) {
                        
trigger_error(STR_LEN);
                        return;
                    }
                    
$out substr($var,$i,$xlen);
                    
$i += $xlen;
                    break;
                case 
V_ARRAY:
                    
$xlen $this->_unserialize($var,true,$i);
                    if (!
is_numeric($xlen)) {
                        
trigger_error(ARR_LEN);
                        return;
                    }
                    
$out = array();
                    
$tmp substr($var,$i,$xlen);
                    
$itmp 0;
                    while (
$itmp $xlen) {
                        
$key    $this->_unserialize($tmp,true,$itmp);
                        
$value  $this->_unserialize($tmp,true,$itmp);
                        
$out[$key] = $value;
                    }
                    
$i += $xlen;
                    break;
                case 
V_OBJECT:
                    
$class_name $this->_unserialize($var,true,$i);
                    
$xlen $this->_unserialize($var,true,$i);
                    if (!
is_numeric($xlen)) {
                        
trigger_error(OBJ_LEN);
                        return;
                    }
                    
/**/
                    
$class_name class_exists($class_name) ? $class_name stdClass;
                    
$out = new $class_name;
                    
/**/
                    
$tmp substr($var,$i,$xlen);
                    
$itmp 0;
                    while (
$itmp $xlen) {
                        
$key    $this->_unserialize($tmp,true,$itmp);
                        
$value  $this->_unserialize($tmp,true,$itmp);
                        
$out->$key $value;
                    }
                    
$i += $xlen;
                    
                    break;
                default:
                    
trigger_error(sprintf(UNKNOW_TYPE,$type));
            }
            if (!
is_null($out)) {
                break; 
            }
        }
        return 
$out;
    }

    function 
serialize($var) {
        
$str "";
        if (
is_integer($var) && $var==0) {
            return 
chr(V_ZERO);
        }
        switch( (
$type=gettype($var)) ) {
            case 
"string":
                
$str .= chr(V_STRING);
                
$str .= $this->serialize((int)strlen($var));
                
$str .= $var;
                break;
            case 
"float":
            case 
"double":
                
$str .= chr($var V_FLOAT_POS V_FLOAT_NEG);
                
$str .= $this->__fromfloat($var);
                break;
            case 
"integer":
            case 
"numeric":
                
$t abs($var);
                if (
$t 255) {
                    
$str .= chr($var V_1INT_POS V_1INT_NEG);
                    
$str .= chr($t);
                } else if (
$t 65536) {
                    
$str .= chr($var V_2INT_POS V_2INT_NEG);
                    
$str .= $this->__fromint($var,2); 
                } else {
                    
$str .= chr($var V_4INT_POS V_4INT_NEG);
                    
$str .= $this->__fromint($var); 
                }
                break;
            case 
"boolean":
                
$str .= chr($var V_BOOL_TRUE V_BOOL_FALSE);
                break;
            case 
"array":
                
$str .= chr(V_ARRAY);
                
$tmp "";
                foreach(
$var as $key => $value) {
                    
$tmp .= $this->serialize($key); 
                    
$tmp .= $this->serialize($value);
                }
                
$str .= $this->serialize(strlen($tmp));
                
$str .= $tmp;
                break;
            case 
"object":
                
$str .= chr(V_OBJECT);
                
$str .= $this->serialize(get_class($var));
                
$tmp "";
                foreach(
get_object_vars($var) as $key => $value) {
                    
$tmp .= $this->serialize($key); 
                    
$tmp .= $this->serialize($value);
                }
                
$str .= $this->serialize(strlen($tmp));
                
$str .= $tmp;
                break;
            default:
                
trigger_error(sprintf(UNKNOW_TYPE,$type));
                break;
        }
        return 
$str;
    }

    function 
__toint($string,$blen=4) {
        
$out  0;
        
$n    = ($blen-1) * 8;
        for(
$bits=0$bits $blen$bits++) {
            
$out |= ord($string[$bits]) << $n;
            
$n -= 8;
        }
        return 
$out;
    }

    function 
__fromint($int,$blen=4) { 
        
$int = (int)($int 0) ? (-1*$int) : $int;
        
$bytes=str_repeat(" ",$blen);
        
$n    = ($blen-1) * 8;
        for(
$bits=0$bits $blen$bits++) {
            
$bytes[$bits] = chr($int  >> $n);
            
$int -= $bytes[$bits] << $n;
            
$n -= 8;
        }
        return 
$bytes;
    }

    function 
__fromfloat($float) {
        
$str  $this->__fromint($float);
        
$str .= $this->__fromintround(($float-(int)$float)*1000) , );
        return 
$str;
    }

    function 
__tofloat($string) {
        
$float  $this->__toint(substr($string,0,4));
        
$float += $this->__toint(substr($string,4,2),2)/1000;
        return 
$float;
    }
}

?>