Tag Archives: open source

Garry`s One Time URL PHP5 Script

Written by Garry Lachman (Admin). Posted on March 5, 2011. Filed under PHP + mySQL. Tagged , , , , , , , , , , , , , , , . 9 Comments.


I open Requirements Specification for Advance One Time URL script.
You can see and help with ideas.

Hi,

I wrote little script + lib for one time url.
this script make MD5 hash string for one time using and redirect file.
the links looks like: http://garry-lachman.com/link/ce75f50f55bcedf0a72098a01764548b and can be used one time only.

The url storing is based on PHP Sessions and link redirection on MOD_REWRITE but there is example
for non MOD_REWRITE using
Example of create of the link:

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<?php
require_once("libs/one_time_url.lib.php");
$one_time_url = new one_time_url();
?>
<a href="<?php echo $one_time_url->make_url("http://www.garry-lachman.com"); ?>">This is one time URL to http://www.garry-lachman.com</a>

The code & example can be downloaded form here.
License: GNU/GPL (open source)

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5 best jQuery Tooltips

Written by Garry Lachman (Admin). Posted on March 1, 2011. Filed under jQuery. Tagged , , , , . 1 Comment.

Hi,
Here is a list of 5 best jQuery tooltips i found.

jQuery tools

Simple & professional, full customized & working from box, positionings, effects, dynamic html code in tooltip.
As far i found, this is the most powerful tooltip i found.
jQuery Tools

 

jQuery plugin: Tooltip

Replacing standard tooltips is easy: Just include the script on the page, add a stylesheet, select the elements to tooltip and call the tooltip plugin.

 

qTip

qTip is an advanced tooltip plugin for the ever popular jQuery JavaScript framework.
Built from the ground up to be user friendly, yet feature rich, qTip provides you with tonnes of features like rounded corners and speech bubble tips, and best of all… it’s completely free under the MIT license!
qtips

 

HTML Tooltip

Inline HTML Tooltip lets you define rich HTML tooltips that are embedded directly inside your webpage and that appear when the mouse rolls over links on your page. The tooltip appears directly beneath the anchor link, and adjusts its position dynamically based on whether the mouse is too close to the window’s edges.

 

BEAUTYTIPS

BeautyTips is a simple-to-use balloon-help style tootip plugin. Any element on the page can be set to show a talk-balloon containing any text or HTML on hover, click, or any bindable event. These balloons are drawn dynamically using the canvas HTML 5 element, and options include corner radius, spike length and width, stroke width. The balloons can auto-position based on the most available area in the current display window or they can be positioned according to an array of preferences (just left or right for instance).

Have fun with the scripts ;)
Garry Lachman

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CodeIgniter – PHP 5 MVC Framework

Written by Garry Lachman (Admin). Posted on February 21, 2011. Filed under PHP + mySQL. Tagged , , , , , , , , , , . 1 Comment.

I really never used frameworks, i always build my system without any frameworks.
but no more… after few days with CodeIgniter i`m in Love…

“CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. If you’re a developer who lives in the real world of shared hosting accounts and clients with deadlines, and if you’re tired of ponderously large and thoroughly undocumented frameworks”

CodeIgniter

Have a nice day ;)

Garry Lachman

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MD5 crypto class ActionScript 3

Written by Garry Lachman (Admin). Posted on December 11, 2010. Filed under ActionScript 3. Tagged , , , , , , , , , , , , . No comments.

One more useful util from as3corelib.
MD5 class crypto.

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<?
/*
  Copyright (c) 2008, Adobe Systems Incorporated
  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 Adobe Systems Incorporated 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR
  CONTRIBUTORS 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.
*/

package com.adobe.crypto {
   
    import com.adobe.utils.IntUtil;
    import flash.utils.ByteArray;  
    /**
     * The MD5 Message-Digest Algorithm
     *
     * Implementation based on algorithm description at
     * http://www.faqs.org/rfcs/rfc1321.html
     */
    public class MD5 {
       
        public static var digest:ByteArray;
        /**
         * Performs the MD5 hash algorithm on a string.
         *
         * @param s The string to hash
         * @return A string containing the hash value of s
         * @langversion ActionScript 3.0
         * @playerversion Flash 8.5
         * @tiptext
         */
         
        public static function hash(s:String) :String{
            //Convert to byteArray and send through hashBinary function
            // so as to only have complex code in one location
            var ba:ByteArray = new ByteArray();
            ba.writeUTFBytes(s);   
            return hashBinary(ba);
        }
       
        public static function hashBytes(s:ByteArray) :String{ 
            return hashBinary(s);
        }
       
        /**
         * Performs the MD5 hash algorithm on a ByteArray.
         *
         * @param s The string to hash
         * @return A string containing the hash value of s
         * @langversion ActionScript 3.0
         * @playerversion Flash 8.5
         * @tiptext
         */  
        public static function hashBinary( s:ByteArray ):String {
            // initialize the md buffers
            var a:int = 1732584193;
            var b:int = -271733879;
            var c:int = -1732584194;
            var d:int = 271733878;
           
            // variables to store previous values
            var aa:int;
            var bb:int;
            var cc:int;
            var dd:int;
           
            // create the blocks from the string and
            // save the length as a local var to reduce
            // lookup in the loop below
            var x:Array = createBlocks( s );
            var len:int = x.length;
           
            // loop over all of the blocks
            for ( var i:int = 0; i < len; i += 16) {
                // save previous values
                aa = a;
                bb = b;
                cc = c;
                dd = d;            
               
                // Round 1
                a = ff( a, b, c, d, x[int(i+ 0)],  7, -680876936 );     // 1
                d = ff( d, a, b, c, x[int(i+ 1)], 12, -389564586 ); // 2
                c = ff( c, d, a, b, x[int(i+ 2)], 17, 606105819 );  // 3
                b = ff( b, c, d, a, x[int(i+ 3)], 22, -1044525330 );    // 4
                a = ff( a, b, c, d, x[int(i+ 4)],  7, -176418897 );     // 5
                d = ff( d, a, b, c, x[int(i+ 5)], 12, 1200080426 );     // 6
                c = ff( c, d, a, b, x[int(i+ 6)], 17, -1473231341 );    // 7
                b = ff( b, c, d, a, x[int(i+ 7)], 22, -45705983 );  // 8
                a = ff( a, b, c, d, x[int(i+ 8)],  7, 1770035416 );     // 9
                d = ff( d, a, b, c, x[int(i+ 9)], 12, -1958414417 );    // 10
                c = ff( c, d, a, b, x[int(i+10)], 17, -42063 );         // 11
                b = ff( b, c, d, a, x[int(i+11)], 22, -1990404162 );    // 12
                a = ff( a, b, c, d, x[int(i+12)],  7, 1804603682 );     // 13
                d = ff( d, a, b, c, x[int(i+13)], 12, -40341101 );  // 14
                c = ff( c, d, a, b, x[int(i+14)], 17, -1502002290 );    // 15
                b = ff( b, c, d, a, x[int(i+15)], 22, 1236535329 );     // 16
               
                // Round 2
                a = gg( a, b, c, d, x[int(i+ 1)],  5, -165796510 );     // 17
                d = gg( d, a, b, c, x[int(i+ 6)],  9, -1069501632 );    // 18
                c = gg( c, d, a, b, x[int(i+11)], 14, 643717713 );  // 19
                b = gg( b, c, d, a, x[int(i+ 0)], 20, -373897302 );     // 20
                a = gg( a, b, c, d, x[int(i+ 5)],  5, -701558691 );     // 21
                d = gg( d, a, b, c, x[int(i+10)],  9, 38016083 );   // 22
                c = gg( c, d, a, b, x[int(i+15)], 14, -660478335 );     // 23
                b = gg( b, c, d, a, x[int(i+ 4)], 20, -405537848 );     // 24
                a = gg( a, b, c, d, x[int(i+ 9)],  5, 568446438 );  // 25
                d = gg( d, a, b, c, x[int(i+14)],  9, -1019803690 );    // 26
                c = gg( c, d, a, b, x[int(i+ 3)], 14, -187363961 );     // 27
                b = gg( b, c, d, a, x[int(i+ 8)], 20, 1163531501 );     // 28
                a = gg( a, b, c, d, x[int(i+13)],  5, -1444681467 );    // 29
                d = gg( d, a, b, c, x[int(i+ 2)],  9, -51403784 );  // 30
                c = gg( c, d, a, b, x[int(i+ 7)], 14, 1735328473 );     // 31
                b = gg( b, c, d, a, x[int(i+12)], 20, -1926607734 );    // 32
               
                // Round 3
                a = hh( a, b, c, d, x[int(i+ 5)],  4, -378558 );    // 33
                d = hh( d, a, b, c, x[int(i+ 8)], 11, -2022574463 );    // 34
                c = hh( c, d, a, b, x[int(i+11)], 16, 1839030562 );     // 35
                b = hh( b, c, d, a, x[int(i+14)], 23, -35309556 );  // 36
                a = hh( a, b, c, d, x[int(i+ 1)],  4, -1530992060 );    // 37
                d = hh( d, a, b, c, x[int(i+ 4)], 11, 1272893353 );     // 38
                c = hh( c, d, a, b, x[int(i+ 7)], 16, -155497632 );     // 39
                b = hh( b, c, d, a, x[int(i+10)], 23, -1094730640 );    // 40
                a = hh( a, b, c, d, x[int(i+13)],  4, 681279174 );  // 41
                d = hh( d, a, b, c, x[int(i+ 0)], 11, -358537222 );     // 42
                c = hh( c, d, a, b, x[int(i+ 3)], 16, -722521979 );     // 43
                b = hh( b, c, d, a, x[int(i+ 6)], 23, 76029189 );   // 44
                a = hh( a, b, c, d, x[int(i+ 9)],  4, -640364487 );     // 45
                d = hh( d, a, b, c, x[int(i+12)], 11, -421815835 );     // 46
                c = hh( c, d, a, b, x[int(i+15)], 16, 530742520 );  // 47
                b = hh( b, c, d, a, x[int(i+ 2)], 23, -995338651 );     // 48
               
                // Round 4
                a = ii( a, b, c, d, x[int(i+ 0)],  6, -198630844 );     // 49
                d = ii( d, a, b, c, x[int(i+ 7)], 10, 1126891415 );     // 50
                c = ii( c, d, a, b, x[int(i+14)], 15, -1416354905 );    // 51
                b = ii( b, c, d, a, x[int(i+ 5)], 21, -57434055 );  // 52
                a = ii( a, b, c, d, x[int(i+12)],  6, 1700485571 );     // 53
                d = ii( d, a, b, c, x[int(i+ 3)], 10, -1894986606 );    // 54
                c = ii( c, d, a, b, x[int(i+10)], 15, -1051523 );   // 55
                b = ii( b, c, d, a, x[int(i+ 1)], 21, -2054922799 );    // 56
                a = ii( a, b, c, d, x[int(i+ 8)],  6, 1873313359 );     // 57
                d = ii( d, a, b, c, x[int(i+15)], 10, -30611744 );  // 58
                c = ii( c, d, a, b, x[int(i+ 6)], 15, -1560198380 );    // 59
                b = ii( b, c, d, a, x[int(i+13)], 21, 1309151649 );     // 60
                a = ii( a, b, c, d, x[int(i+ 4)],  6, -145523070 );     // 61
                d = ii( d, a, b, c, x[int(i+11)], 10, -1120210379 );    // 62
                c = ii( c, d, a, b, x[int(i+ 2)], 15, 718787259 );  // 63
                b = ii( b, c, d, a, x[int(i+ 9)], 21, -343485551 );     // 64

                a += aa;
                b += bb;
                c += cc;
                d += dd;
            }
            digest = new ByteArray()
            digest.writeInt(a);
            digest.writeInt(b);
            digest.writeInt(c);
            digest.writeInt(d);
            digest.position = 0;
            // Finish up by concatening the buffers with their hex output
            return IntUtil.toHex( a ) + IntUtil.toHex( b ) + IntUtil.toHex( c ) + IntUtil.toHex( d );
        }
       
        /**
         * Auxiliary function f as defined in RFC
         */
        private static function f( x:int, y:int, z:int ):int {
            return ( x & y ) | ( (~x) & z );
        }
       
        /**
         * Auxiliary function g as defined in RFC
         */
        private static function g( x:int, y:int, z:int ):int {
            return ( x & z ) | ( y & (~z) );
        }
       
        /**
         * Auxiliary function h as defined in RFC
         */
        private static function h( x:int, y:int, z:int ):int {
            return x ^ y ^ z;
        }
       
        /**
         * Auxiliary function i as defined in RFC
         */
        private static function i( x:int, y:int, z:int ):int {
            return y ^ ( x | (~z) );
        }
       
        /**
         * A generic transformation function.  The logic of ff, gg, hh, and
         * ii are all the same, minus the function used, so pull that logic
         * out and simplify the method bodies for the transoformation functions.
         */
        private static function transform( func:Function, a:int, b:int, c:int, d:int, x:int, s:int, t:int):int {
            var tmp:int = a + int( func( b, c, d ) ) + x + t;
            return IntUtil.rol( tmp, s ) +  b;
        }
       
        /**
         * ff transformation function
         */
        private static function ff ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
            return transform( f, a, b, c, d, x, s, t );
        }
       
        /**
         * gg transformation function
         */
        private static function gg ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
            return transform( g, a, b, c, d, x, s, t );
        }
       
        /**
         * hh transformation function
         */
        private static function hh ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
            return transform( h, a, b, c, d, x, s, t );
        }
       
        /**
         * ii transformation function
         */
        private static function ii ( a:int, b:int, c:int, d:int, x:int, s:int, t:int ):int {
            return transform( i, a, b, c, d, x, s, t );
        }
       
        /**
         * Converts a string to a sequence of 16-word blocks
         * that we'll do the processing on.  Appends padding
         * and length in the process.
         *
         * @param s The string to split into blocks
         * @return An array containing the blocks that s was
         *          split into.
         */
        private static function createBlocks( s:ByteArray ):Array {
            var blocks:Array = new Array();
            var len:int = s.length * 8;
            var mask:int = 0xFF; // ignore hi byte of characters > 0xFF
            for( var i:int = 0; i < len; i += 8 ) {
                blocks[ int(i >> 5) ] |= ( s[ i / 8 ] & mask ) << ( i % 32 );
            }
           
            // append padding and length
            blocks[ int(len >> 5) ] |= 0x80 << ( len % 32 );
            blocks[ int(( ( ( len + 64 ) >>> 9 ) << 4 ) + 14) ] = len;
            return blocks;
        }
       
    }
}
?>

Have a fun ;)
Garry Lachman

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JPEG Encoder ActionScript 3

Written by Garry Lachman (Admin). Posted on December 11, 2010. Filed under ActionScript 3. Tagged , , , , , , , , , , , , , , . No comments.

One more useful util from as3corelib.
Encode display object to JPEG ByteArray

BitString.as:

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<?
/*
  Copyright (c) 2008, Adobe Systems Incorporated
  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 Adobe Systems Incorporated 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR
  CONTRIBUTORS 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.
*/
package com.adobe.images
{
    public class BitString
    {
        public var len:int = 0;
        public var val:int = 0;
    }
}
?>

JPGEncoder.as:

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<?
/*
  Copyright (c) 2008, Adobe Systems Incorporated
  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 Adobe Systems Incorporated 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR
  CONTRIBUTORS 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.
*/
package com.adobe.images
{
    import flash.geom.*;
    import flash.display.*;
    import flash.utils.*;
   
    /**
     * Class that converts BitmapData into a valid JPEG
     */    
    public class JPGEncoder
    {

        // Static table initialization
   
        private var ZigZag:Array = [
             0, 1, 5, 6,14,15,27,28,
             2, 4, 7,13,16,26,29,42,
             3, 8,12,17,25,30,41,43,
             9,11,18,24,31,40,44,53,
            10,19,23,32,39,45,52,54,
            20,22,33,38,46,51,55,60,
            21,34,37,47,50,56,59,61,
            35,36,48,49,57,58,62,63
        ];
   
        private var YTable:Array = new Array(64);
        private var UVTable:Array = new Array(64);
        private var fdtbl_Y:Array = new Array(64);
        private var fdtbl_UV:Array = new Array(64);
   
        private function initQuantTables(sf:int):void
        {
            var i:int;
            var t:Number;
            var YQT:Array = [
                16, 11, 10, 16, 24, 40, 51, 61,
                12, 12, 14, 19, 26, 58, 60, 55,
                14, 13, 16, 24, 40, 57, 69, 56,
                14, 17, 22, 29, 51, 87, 80, 62,
                18, 22, 37, 56, 68,109,103, 77,
                24, 35, 55, 64, 81,104,113, 92,
                49, 64, 78, 87,103,121,120,101,
                72, 92, 95, 98,112,100,103, 99
            ];
            for (i = 0; i < 64; i++) {
                t = Math.floor((YQT[i]*sf+50)/100);
                if (t < 1) {
                    t = 1;
                } else if (t > 255) {
                    t = 255;
                }
                YTable[ZigZag[i]] = t;
            }
            var UVQT:Array = [
                17, 18, 24, 47, 99, 99, 99, 99,
                18, 21, 26, 66, 99, 99, 99, 99,
                24, 26, 56, 99, 99, 99, 99, 99,
                47, 66, 99, 99, 99, 99, 99, 99,
                99, 99, 99, 99, 99, 99, 99, 99,
                99, 99, 99, 99, 99, 99, 99, 99,
                99, 99, 99, 99, 99, 99, 99, 99,
                99, 99, 99, 99, 99, 99, 99, 99
            ];
            for (i = 0; i < 64; i++) {
                t = Math.floor((UVQT[i]*sf+50)/100);
                if (t < 1) {
                    t = 1;
                } else if (t > 255) {
                    t = 255;
                }
                UVTable[ZigZag[i]] = t;
            }
            var aasf:Array = [
                1.0, 1.387039845, 1.306562965, 1.175875602,
                1.0, 0.785694958, 0.541196100, 0.275899379
            ];
            i = 0;
            for (var row:int = 0; row < 8; row++)
            {
                for (var col:int = 0; col < 8; col++)
                {
                    fdtbl_Y[i]  = (1.0 / (YTable [ZigZag[i]] * aasf[row] * aasf[col] * 8.0));
                    fdtbl_UV[i] = (1.0 / (UVTable[ZigZag[i]] * aasf[row] * aasf[col] * 8.0));
                    i++;
                }
            }
        }
   
        private var YDC_HT:Array;
        private var UVDC_HT:Array;
        private var YAC_HT:Array;
        private var UVAC_HT:Array;
   
        private function computeHuffmanTbl(nrcodes:Array, std_table:Array):Array
        {
            var codevalue:int = 0;
            var pos_in_table:int = 0;
            var HT:Array = new Array();
            for (var k:int=1; k<=16; k++) {
                for (var j:int=1; j<=nrcodes[k]; j++) {
                    HT[std_table[pos_in_table]] = new BitString();
                    HT[std_table[pos_in_table]].val = codevalue;
                    HT[std_table[pos_in_table]].len = k;
                    pos_in_table++;
                    codevalue++;
                }
                codevalue*=2;
            }
            return HT;
        }
   
        private var std_dc_luminance_nrcodes:Array = [0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0];
        private var std_dc_luminance_values:Array = [0,1,2,3,4,5,6,7,8,9,10,11];
        private var std_ac_luminance_nrcodes:Array = [0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d];
        private var std_ac_luminance_values:Array = [
            0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,
            0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,
            0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08,
            0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,
            0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,
            0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28,
            0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,
            0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,
            0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59,
            0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,
            0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,
            0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89,
            0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,
            0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,
            0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6,
            0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,
            0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,
            0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2,
            0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,
            0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,
            0xf9,0xfa
        ];
   
        private var std_dc_chrominance_nrcodes:Array = [0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0];
        private var std_dc_chrominance_values:Array = [0,1,2,3,4,5,6,7,8,9,10,11];
        private var std_ac_chrominance_nrcodes:Array = [0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77];
        private var std_ac_chrominance_values:Array = [
            0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,
            0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,
            0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91,
            0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,
            0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,
            0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26,
            0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,
            0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,
            0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,
            0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,
            0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,
            0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87,
            0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,
            0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,
            0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,
            0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,
            0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,
            0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,
            0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,
            0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,
            0xf9,0xfa
        ];
   
        private function initHuffmanTbl():void
        {
            YDC_HT = computeHuffmanTbl(std_dc_luminance_nrcodes,std_dc_luminance_values);
            UVDC_HT = computeHuffmanTbl(std_dc_chrominance_nrcodes,std_dc_chrominance_values);
            YAC_HT = computeHuffmanTbl(std_ac_luminance_nrcodes,std_ac_luminance_values);
            UVAC_HT = computeHuffmanTbl(std_ac_chrominance_nrcodes,std_ac_chrominance_values);
        }
   
        private var bitcode:Array = new Array(65535);
        private var category:Array = new Array(65535);
   
        private function initCategoryNumber():void
        {
            var nrlower:int = 1;
            var nrupper:int = 2;
            var nr:int;
            for (var cat:int=1; cat<=15; cat++) {
                //Positive numbers
                for (nr=nrlower; nr<nrupper; nr++) {
                    category[32767+nr] = cat;
                    bitcode[32767+nr] = new BitString();
                    bitcode[32767+nr].len = cat;
                    bitcode[32767+nr].val = nr;
                }
                //Negative numbers
                for (nr=-(nrupper-1); nr<=-nrlower; nr++) {
                    category[32767+nr] = cat;
                    bitcode[32767+nr] = new BitString();
                    bitcode[32767+nr].len = cat;
                    bitcode[32767+nr].val = nrupper-1+nr;
                }
                nrlower <<= 1;
                nrupper <<= 1;
            }
        }
   
        // IO functions
   
        private var byteout:ByteArray;
        private var bytenew:int = 0;
        private var bytepos:int = 7;
   
        private function writeBits(bs:BitString):void
        {
            var value:int = bs.val;
            var posval:int = bs.len-1;
            while ( posval >= 0 ) {
                if (value & uint(1 << posval) ) {
                    bytenew |= uint(1 << bytepos);
                }
                posval--;
                bytepos--;
                if (bytepos < 0) {
                    if (bytenew == 0xFF) {
                        writeByte(0xFF);
                        writeByte(0);
                    }
                    else {
                        writeByte(bytenew);
                    }
                    bytepos=7;
                    bytenew=0;
                }
            }
        }
   
        private function writeByte(value:int):void
        {
            byteout.writeByte(value);
        }
   
        private function writeWord(value:int):void
        {
            writeByte((value>>8)&0xFF);
            writeByte((value   )&0xFF);
        }
   
        // DCT & quantization core
   
        private function fDCTQuant(data:Array, fdtbl:Array):Array
        {
            var tmp0:Number, tmp1:Number, tmp2:Number, tmp3:Number, tmp4:Number, tmp5:Number, tmp6:Number, tmp7:Number;
            var tmp10:Number, tmp11:Number, tmp12:Number, tmp13:Number;
            var z1:Number, z2:Number, z3:Number, z4:Number, z5:Number, z11:Number, z13:Number;
            var i:int;
            /* Pass 1: process rows. */
            var dataOff:int=0;
            for (i=0; i<8; i++) {
                tmp0 = data[dataOff+0] + data[dataOff+7];
                tmp7 = data[dataOff+0] - data[dataOff+7];
                tmp1 = data[dataOff+1] + data[dataOff+6];
                tmp6 = data[dataOff+1] - data[dataOff+6];
                tmp2 = data[dataOff+2] + data[dataOff+5];
                tmp5 = data[dataOff+2] - data[dataOff+5];
                tmp3 = data[dataOff+3] + data[dataOff+4];
                tmp4 = data[dataOff+3] - data[dataOff+4];
   
                /* Even part */
                tmp10 = tmp0 + tmp3;    /* phase 2 */
                tmp13 = tmp0 - tmp3;
                tmp11 = tmp1 + tmp2;
                tmp12 = tmp1 - tmp2;
   
                data[dataOff+0] = tmp10 + tmp11; /* phase 3 */
                data[dataOff+4] = tmp10 - tmp11;
   
                z1 = (tmp12 + tmp13) * 0.707106781; /* c4 */
                data[dataOff+2] = tmp13 + z1; /* phase 5 */
                data[dataOff+6] = tmp13 - z1;
   
                /* Odd part */
                tmp10 = tmp4 + tmp5; /* phase 2 */
                tmp11 = tmp5 + tmp6;
                tmp12 = tmp6 + tmp7;
   
                /* The rotator is modified from fig 4-8 to avoid extra negations. */
                z5 = (tmp10 - tmp12) * 0.382683433; /* c6 */
                z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
                z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
                z3 = tmp11 * 0.707106781; /* c4 */
   
                z11 = tmp7 + z3;    /* phase 5 */
                z13 = tmp7 - z3;
   
                data[dataOff+5] = z13 + z2; /* phase 6 */
                data[dataOff+3] = z13 - z2;
                data[dataOff+1] = z11 + z4;
                data[dataOff+7] = z11 - z4;
   
                dataOff += 8; /* advance pointer to next row */
            }
   
            /* Pass 2: process columns. */
            dataOff = 0;
            for (i=0; i<8; i++) {
                tmp0 = data[dataOff+ 0] + data[dataOff+56];
                tmp7 = data[dataOff+ 0] - data[dataOff+56];
                tmp1 = data[dataOff+ 8] + data[dataOff+48];
                tmp6 = data[dataOff+ 8] - data[dataOff+48];
                tmp2 = data[dataOff+16] + data[dataOff+40];
                tmp5 = data[dataOff+16] - data[dataOff+40];
                tmp3 = data[dataOff+24] + data[dataOff+32];
                tmp4 = data[dataOff+24] - data[dataOff+32];
   
                /* Even part */
                tmp10 = tmp0 + tmp3;    /* phase 2 */
                tmp13 = tmp0 - tmp3;
                tmp11 = tmp1 + tmp2;
                tmp12 = tmp1 - tmp2;
   
                data[dataOff+ 0] = tmp10 + tmp11; /* phase 3 */
                data[dataOff+32] = tmp10 - tmp11;
   
                z1 = (tmp12 + tmp13) * 0.707106781; /* c4 */
                data[dataOff+16] = tmp13 + z1; /* phase 5 */
                data[dataOff+48] = tmp13 - z1;
   
                /* Odd part */
                tmp10 = tmp4 + tmp5; /* phase 2 */
                tmp11 = tmp5 + tmp6;
                tmp12 = tmp6 + tmp7;
   
                /* The rotator is modified from fig 4-8 to avoid extra negations. */
                z5 = (tmp10 - tmp12) * 0.382683433; /* c6 */
                z2 = 0.541196100 * tmp10 + z5; /* c2-c6 */
                z4 = 1.306562965 * tmp12 + z5; /* c2+c6 */
                z3 = tmp11 * 0.707106781; /* c4 */
   
                z11 = tmp7 + z3;    /* phase 5 */
                z13 = tmp7 - z3;
   
                data[dataOff+40] = z13 + z2; /* phase 6 */
                data[dataOff+24] = z13 - z2;
                data[dataOff+ 8] = z11 + z4;
                data[dataOff+56] = z11 - z4;
   
                dataOff++; /* advance pointer to next column */
            }
   
            // Quantize/descale the coefficients
            for (i=0; i<64; i++) {
                // Apply the quantization and scaling factor & Round to nearest integer
                data[i] = Math.round((data[i]*fdtbl[i]));
            }
            return data;
        }
   
        // Chunk writing
   
        private function writeAPP0():void
        {
            writeWord(0xFFE0); // marker
            writeWord(16); // length
            writeByte(0x4A); // J
            writeByte(0x46); // F
            writeByte(0x49); // I
            writeByte(0x46); // F
            writeByte(0); // = "JFIF",'\0'
            writeByte(1); // versionhi
            writeByte(1); // versionlo
            writeByte(0); // xyunits
            writeWord(1); // xdensity
            writeWord(1); // ydensity
            writeByte(0); // thumbnwidth
            writeByte(0); // thumbnheight
        }
   
        private function writeSOF0(width:int, height:int):void
        {
            writeWord(0xFFC0); // marker
            writeWord(17);   // length, truecolor YUV JPG
            writeByte(8);    // precision
            writeWord(height);
            writeWord(width);
            writeByte(3);    // nrofcomponents
            writeByte(1);    // IdY
            writeByte(0x11); // HVY
            writeByte(0);    // QTY
            writeByte(2);    // IdU
            writeByte(0x11); // HVU
            writeByte(1);    // QTU
            writeByte(3);    // IdV
            writeByte(0x11); // HVV
            writeByte(1);    // QTV
        }
   
        private function writeDQT():void
        {
            writeWord(0xFFDB); // marker
            writeWord(132);    // length
            writeByte(0);
            var i:int;
            for (i=0; i<64; i++) {
                writeByte(YTable[i]);
            }
            writeByte(1);
            for (i=0; i<64; i++) {
                writeByte(UVTable[i]);
            }
        }
   
        private function writeDHT():void
        {
            writeWord(0xFFC4); // marker
            writeWord(0x01A2); // length
            var i:int;
   
            writeByte(0); // HTYDCinfo
            for (i=0; i<16; i++) {
                writeByte(std_dc_luminance_nrcodes[i+1]);
            }
            for (i=0; i<=11; i++) {
                writeByte(std_dc_luminance_values[i]);
            }
   
            writeByte(0x10); // HTYACinfo
            for (i=0; i<16; i++) {
                writeByte(std_ac_luminance_nrcodes[i+1]);
            }
            for (i=0; i<=161; i++) {
                writeByte(std_ac_luminance_values[i]);
            }
   
            writeByte(1); // HTUDCinfo
            for (i=0; i<16; i++) {
                writeByte(std_dc_chrominance_nrcodes[i+1]);
            }
            for (i=0; i<=11; i++) {
                writeByte(std_dc_chrominance_values[i]);
            }
   
            writeByte(0x11); // HTUACinfo
            for (i=0; i<16; i++) {
                writeByte(std_ac_chrominance_nrcodes[i+1]);
            }
            for (i=0; i<=161; i++) {
                writeByte(std_ac_chrominance_values[i]);
            }
        }
   
        private function writeSOS():void
        {
            writeWord(0xFFDA); // marker
            writeWord(12); // length
            writeByte(3); // nrofcomponents
            writeByte(1); // IdY
            writeByte(0); // HTY
            writeByte(2); // IdU
            writeByte(0x11); // HTU
            writeByte(3); // IdV
            writeByte(0x11); // HTV
            writeByte(0); // Ss
            writeByte(0x3f); // Se
            writeByte(0); // Bf
        }
   
        // Core processing
        private var DU:Array = new Array(64);
   
        private function processDU(CDU:Array, fdtbl:Array, DC:Number, HTDC:Array, HTAC:Array):Number
        {
            var EOB:BitString = HTAC[0x00];
            var M16zeroes:BitString = HTAC[0xF0];
            var i:int;
   
            var DU_DCT:Array = fDCTQuant(CDU, fdtbl);
            //ZigZag reorder
            for (i=0;i<64;i++) {
                DU[ZigZag[i]]=DU_DCT[i];
            }
            var Diff:int = DU[0] - DC; DC = DU[0];
            //Encode DC
            if (Diff==0) {
                writeBits(HTDC[0]); // Diff might be 0
            } else {
                writeBits(HTDC[category[32767+Diff]]);
                writeBits(bitcode[32767+Diff]);
            }
            //Encode ACs
            var end0pos:int = 63;
            for (; (end0pos>0)&&(DU[end0pos]==0); end0pos--) {
            };
            //end0pos = first element in reverse order !=0
            if ( end0pos == 0) {
                writeBits(EOB);
                return DC;
            }
            i = 1;
            while ( i <= end0pos ) {
                var startpos:int = i;
                for (; (DU[i]==0) && (i<=end0pos); i++) {
                }
                var nrzeroes:int = i-startpos;
                if ( nrzeroes >= 16 ) {
                    for (var nrmarker:int=1; nrmarker <= nrzeroes/16; nrmarker++) {
                        writeBits(M16zeroes);
                    }
                    nrzeroes = int(nrzeroes&0xF);
                }
                writeBits(HTAC[nrzeroes*16+category[32767+DU[i]]]);
                writeBits(bitcode[32767+DU[i]]);
                i++;
            }
            if ( end0pos != 63 ) {
                writeBits(EOB);
            }
            return DC;
        }
   
        private var YDU:Array = new Array(64);
        private var UDU:Array = new Array(64);
        private var VDU:Array = new Array(64);
   
        private function RGB2YUV(img:BitmapData, xpos:int, ypos:int):void
        {
            var pos:int=0;
            for (var y:int=0; y<8; y++) {
                for (var x:int=0; x<8; x++) {
                    var P:uint = img.getPixel32(xpos+x,ypos+y);
                    var R:Number = Number((P>>16)&0xFF);
                    var G:Number = Number((P>> 8)&0xFF);
                    var B:Number = Number((P    )&0xFF);
                    YDU[pos]=((( 0.29900)*R+( 0.58700)*G+( 0.11400)*B))-128;
                    UDU[pos]=(((-0.16874)*R+(-0.33126)*G+( 0.50000)*B));
                    VDU[pos]=((( 0.50000)*R+(-0.41869)*G+(-0.08131)*B));
                    pos++;
                }
            }
        }
   
        /**
         * Constructor for JPEGEncoder class
         *
         * @param quality The quality level between 1 and 100 that detrmines the
         * level of compression used in the generated JPEG
         * @langversion ActionScript 3.0
         * @playerversion Flash 9.0
         * @tiptext
         */    
        public function JPGEncoder(quality:Number = 50)
        {
            if (quality <= 0) {
                quality = 1;
            }
            if (quality > 100) {
                quality = 100;
            }
            var sf:int = 0;
            if (quality < 50) {
                sf = int(5000 / quality);
            } else {
                sf = int(200 - quality*2);
            }
            // Create tables
            initHuffmanTbl();
            initCategoryNumber();
            initQuantTables(sf);
        }
   
        /**
         * Created a JPEG image from the specified BitmapData
         *
         * @param image The BitmapData that will be converted into the JPEG format.
         * @return a ByteArray representing the JPEG encoded image data.
         * @langversion ActionScript 3.0
         * @playerversion Flash 9.0
         * @tiptext
         */
        public function encode(image:BitmapData):ByteArray
        {
            // Initialize bit writer
            byteout = new ByteArray();
            bytenew=0;
            bytepos=7;
   
            // Add JPEG headers
            writeWord(0xFFD8); // SOI
            writeAPP0();
            writeDQT();
            writeSOF0(image.width,image.height);
            writeDHT();
            writeSOS();

   
            // Encode 8x8 macroblocks
            var DCY:Number=0;
            var DCU:Number=0;
            var DCV:Number=0;
            bytenew=0;
            bytepos=7;
            for (var ypos:int=0; ypos<image.height; ypos+=8) {
                for (var xpos:int=0; xpos<image.width; xpos+=8) {
                    RGB2YUV(image, xpos, ypos);
                    DCY = processDU(YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT);
                    DCU = processDU(UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
                    DCV = processDU(VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
                }
            }
   
            // Do the bit alignment of the EOI marker
            if ( bytepos >= 0 ) {
                var fillbits:BitString = new BitString();
                fillbits.len = bytepos+1;
                fillbits.val = (1<<(bytepos+1))-1;
                writeBits(fillbits);
            }
   
            writeWord(0xFFD9); //EOI
            return byteout;
        }
    }
}
?>

Have a nice day ;)
Garry Lachman

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PNG Encoder in ActionScript 3

Written by Garry Lachman (Admin). Posted on December 11, 2010. Filed under ActionScript 3. Tagged , , , , , , , , , , , , . 1 Comment.

ActionScript 3 PNG Encoder class, for exporting display objects into PNG ByteArray….
Taken from as3corelib project.

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<?
/*
  Copyright (c) 2008, Adobe Systems Incorporated
  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 Adobe Systems Incorporated 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR
  CONTRIBUTORS 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.
*/
package
{
    import flash.geom.*;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.utils.ByteArray;

    /**
     * Class that converts BitmapData into a valid PNG
     */
    public class PNGEncoder
    {
        /**
         * Created a PNG image from the specified BitmapData
         *
         * @param image The BitmapData that will be converted into the PNG format.
         * @return a ByteArray representing the PNG encoded image data.
         * @langversion ActionScript 3.0
         * @playerversion Flash 9.0
         * @tiptext
         */        
        public static function encode(img:BitmapData):ByteArray {
            // Create output byte array
            var png:ByteArray = new ByteArray();
            // Write PNG signature
            png.writeUnsignedInt(0x89504e47);
            png.writeUnsignedInt(0x0D0A1A0A);
            // Build IHDR chunk
            var IHDR:ByteArray = new ByteArray();
            IHDR.writeInt(img.width);
            IHDR.writeInt(img.height);
            IHDR.writeUnsignedInt(0x08060000); // 32bit RGBA
            IHDR.writeByte(0);
            writeChunk(png,0x49484452,IHDR);
            // Build IDAT chunk
            var IDAT:ByteArray= new ByteArray();
            for(var i:int=0;i < img.height;i++) {
                // no filter
                IDAT.writeByte(0);
                var p:uint;
                var j:int;
                if ( !img.transparent ) {
                    for(j=0;j < img.width;j++) {
                        p = img.getPixel(j,i);
                        IDAT.writeUnsignedInt(
                            uint(((p&0xFFFFFF) << 8)|0xFF));
                    }
                } else {
                    for(j=0;j < img.width;j++) {
                        p = img.getPixel32(j,i);
                        IDAT.writeUnsignedInt(
                            uint(((p&0xFFFFFF) << 8)|
                            (p>>>24)));
                    }
                }
            }
            IDAT.compress();
            writeChunk(png,0x49444154,IDAT);
            // Build IEND chunk
            writeChunk(png,0x49454E44,null);
            // return PNG
            return png;
        }
   
        private static var crcTable:Array;
        private static var crcTableComputed:Boolean = false;
   
        private static function writeChunk(png:ByteArray,
                type:uint, data:ByteArray):void {
            if (!crcTableComputed) {
                crcTableComputed = true;
                crcTable = [];
                var c:uint;
                for (var n:uint = 0; n < 256; n++) {
                    c = n;
                    for (var k:uint = 0; k < 8; k++) {
                        if (c & 1) {
                            c = uint(uint(0xedb88320) ^
                                uint(c >>> 1));
                        } else {
                            c = uint(c >>> 1);
                        }
                    }
                    crcTable[n] = c;
                }
            }
            var len:uint = 0;
            if (data != null) {
                len = data.length;
            }
            png.writeUnsignedInt(len);
            var p:uint = png.position;
            png.writeUnsignedInt(type);
            if ( data != null ) {
                png.writeBytes(data);
            }
            var e:uint = png.position;
            png.position = p;
            c = 0xffffffff;
            for (var i:int = 0; i < (e-p); i++) {
                c = uint(crcTable[
                    (c ^ png.readUnsignedByte()) &
                    uint(0xff)] ^ uint(c >>> 8));
            }
            c = uint(c^uint(0xffffffff));
            png.position = e;
            png.writeUnsignedInt(c);
        }
    }
}
?>

Have a fun !!!
Garry Lachman

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PHP MySQL Shopping Cart Tutorial in PHP

Written by Garry Lachman (Admin). Posted on April 26, 2010. Filed under PHP + mySQL. Tagged , , , , , , , , , , , , . No comments.

Very good & useful tutorial that i found while search the web about
Abstracting of shopping cart….

“Yes, this is a another shopping cart tutorial. I am planning to make this tutorial to cover a more sophisticated shopping cart solution but for now it only explains a basic shopping cart. I will improve it in time so stay tuned.”

Check if out here: http://www.phpwebcommerce.com/

Have fun,
Garry Lachman

UF4W22PSSX9C

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