<?php

/*

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

::

::	GIFEncoder Version 2.0 by László Zsidi, http://gifs.hu

::

::	This class is a rewritten 'GifMerge.class.php' version.

::

::  Modification:

::   - Simplified and easy code,

::   - Ultra fast encoding,

::   - Built-in errors,

::   - Stable working

::

::

::	Updated at 2007. 02. 13. '00.05.AM'

::

::

::

::  Try on-line GIFBuilder Form demo based on GIFEncoder.

::

::  http://gifs.hu/phpclasses/demos/GifBuilder/

::

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

*/



Class GIFEncoder {

	var $GIF = "GIF89a";		/* GIF header 6 bytes	*/

	var $VER = "GIFEncoder V2.05";	/* Encoder version		*/



	var $BUF = Array ( );

	var $LOP =  0;

	var $DIS =  2;

	var $COL = -1;

	var $IMG = -1;



	var $ERR = Array (

		ERR00=>"Does not supported function for only one image!",

		ERR01=>"Source is not a GIF image!",

		ERR02=>"Unintelligible flag ",

		ERR03=>"Does not make animation from animated GIF source",

	);



	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GIFEncoder...

	::

	*/

	function GIFEncoder	(

							$GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,

							$GIF_red, $GIF_grn, $GIF_blu, $GIF_mod

						) {

		if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {

			printf	( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );

			exit	( 0 );

		}

		$this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;

		$this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;

		$this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?

						( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;



		for ( $i = 0; $i < count ( $GIF_src ); $i++ ) {

			if ( strToLower ( $GIF_mod ) == "url" ) {

				$this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );

			}

			else if ( strToLower ( $GIF_mod ) == "bin" ) {

				$this->BUF [ ] = $GIF_src [ $i ];

			}

			else {

				printf	( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );

				exit	( 0 );

			}

			if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {

				printf	( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );

				exit	( 0 );

			}

			for ( $j = ( 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {

				switch ( $this->BUF [ $i ] { $j } ) {

					case "!":

						if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {

							printf	( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );

							exit	( 0 );

						}

						break;

					case ";":

						$k = FALSE;

						break;

				}

			}

		}

		GIFEncoder::GIFAddHeader ( );

		for ( $i = 0; $i < count ( $this->BUF ); $i++ ) {

			GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );

		}

		GIFEncoder::GIFAddFooter ( );

	}

	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GIFAddHeader...

	::

	*/

	function GIFAddHeader ( ) {

		$cmap = 0;



		if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {

			$cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) );



			$this->GIF .= substr ( $this->BUF [ 0 ], 6, 7		);

			$this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap	);

			$this->GIF .= "!\377\13NETSCAPE2.0\3\1" . GIFEncoder::GIFWord ( $this->LOP ) . "\0";

		}

	}

	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GIFAddFrames...

	::

	*/

	function GIFAddFrames ( $i, $d ) {



		$Locals_str = 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) );



		$Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;

		$Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );



		$Global_len = 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 );

		$Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );



		$Global_rgb = substr ( $this->BUF [ 0  ], 13,

							3 * ( 2 << ( ord ( $this->BUF [ 0  ] { 10 } ) & 0x07 ) ) );

		$Locals_rgb = substr ( $this->BUF [ $i ], 13,

							3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) );



		$Locals_ext = "!\xF9\x04" . chr ( ( $this->DIS << 2 ) + 0 ) .

						chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "\x0\x0";



		if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {

			for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {

				if	(

						ord ( $Locals_rgb { 3 * $j + 0 } ) == ( ( $this->COL >> 16 ) & 0xFF ) &&

						ord ( $Locals_rgb { 3 * $j + 1 } ) == ( ( $this->COL >>  8 ) & 0xFF ) &&

						ord ( $Locals_rgb { 3 * $j + 2 } ) == ( ( $this->COL >>  0 ) & 0xFF )

					) {

					$Locals_ext = "!\xF9\x04" . chr ( ( $this->DIS << 2 ) + 1 ) .

									chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "\x0";

					break;

				}

			}

		}

		switch ( $Locals_tmp { 0 } ) {

			case "!":

				$Locals_img = substr ( $Locals_tmp, 8, 10 );

				$Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );

				break;

			case ",":

				$Locals_img = substr ( $Locals_tmp, 0, 10 );

				$Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );

				break;

		}

		if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) {

			if ( $Global_len == $Locals_len ) {

				if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {

					$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );

				}

				else {

					$byte  = ord ( $Locals_img { 9 } );

					$byte |= 0x80;

					$byte &= 0xF8;

					$byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );

					$Locals_img { 9 } = chr ( $byte );

					$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );

				}

			}

			else {

				$byte  = ord ( $Locals_img { 9 } );

				$byte |= 0x80;

				$byte &= 0xF8;

				$byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );

				$Locals_img { 9 } = chr ( $byte );

				$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );

			}

		}

		else {

			$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );

		}

		$this->IMG  = 1;

	}

	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GIFAddFooter...

	::

	*/

	function GIFAddFooter ( ) {

		$this->GIF .= ";";

	}

	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GIFBlockCompare...

	::

	*/

	function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {



		for ( $i = 0; $i < $Len; $i++ ) {

			if	(

					$GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } ||

					$GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } ||

					$GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 }

				) {

					return ( 0 );

			}

		}



		return ( 1 );

	}

	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GIFWord...

	::

	*/

	function GIFWord ( $int ) {



		return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );

	}

	/*

	:::::::::::::::::::::::::::::::::::::::::::::::::::

	::

	::	GetAnimation...

	::

	*/

	function GetAnimation ( ) {

		return ( $this->GIF );

	}

}

?>

