<?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 );


	}


}


?>


