codeimg.php

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<?php


class verifycode
{

	var $Noisy = 5;
	var $Count = 4;
	var $Width = 60;
	var $Height = 18;
	var $Angle = 2;
	var $Offset = 20;
	var $Border = 1;
	var $imgData = "";
	var $Graph = array( );
	var $code = "";

	function vcode( $code )
	{
		global $code;
		$this->code = $code;
		$i = 0;
		for ( ;	$i < strlen( $code );	$i++	)
		{
			$this->setdraw( substr( $code, $i, 1 ), $i );
		}
	}

	function setdot( $pX, $pY )
	{
		if ( 0 <= $pX * ( $this->Width - $pX - 1 ) && 0 <= $pY * ( $this->Height - $pY - 1 ) )
		{
			$this->Graph[$pX][$pY] = 1;
		}
	}

	function rnd( )
	{
		mt_srand( ( double )microtime( ) * 1000000 );
		return mt_rand( 1, 999 ) / 1000;
	}

	function sgn( $v )
	{
		if ( 0 < $v )
		{
			return 1;
		}
		if ( $v == 0 )
		{
			return 0;
		}
		if ( $v < 0 )
		{
			return 0 - 1;
		}
	}

	function setdraw( $pIndex, $pNumber )
	{
		$DotData[0] = array( 10, 1, 80, 1, 80, 100, 10, 100, 10, 1 );
		$DotData[1] = array( 30, 15, 50, 1, 50, 100 );
		$DotData[2] = array( 1, 34, 30, 1, 71, 1, 100, 34, 1, 100, 93, 100, 100, 86 );
		$DotData[3] = array( 1, 1, 100, 1, 42, 42, 100, 70, 50, 100, 1, 70 );
		$DotData[4] = array( 100, 73, 6, 73, 75, 6, 75, 100 );
		$DotData[5] = array( 100, 1, 1, 1, 1, 50, 50, 35, 100, 55, 100, 80, 50, 100, 1, 95 );
		$DotData[6] = array( 100, 20, 70, 1, 20, 1, 1, 30, 1, 80, 30, 100, 70, 100, 100, 80, 100, 60, 70, 50, 30, 50, 1, 60 );
		$DotData[7] = array( 6, 26, 6, 6, 100, 6, 53, 100 );
		$DotData[8] = array( 100, 30, 100, 20, 70, 1, 30, 1, 1, 20, 1, 30, 100, 70, 100, 80, 70, 100, 30, 100, 1, 80, 1, 70, 100, 30 );
		$DotData[9] = array( 1, 80, 30, 100, 80, 100, 100, 70, 100, 20, 70, 1, 30, 1, 1, 20, 1, 40, 30, 50, 70, 50, 100, 40 );
		$vExtent = $this->Width / strlen( $this->code );
		$Margin[0] = $this->Border + $vExtent * $pNumber + $vExtent * ( $this->rnd( ) * $this->Offset ) / 100;
		$Margin[1] = $vExtent * ( $pNumber + 1 ) - $this->Border - $vExtent * ( $this->rnd( ) * $this->Offset ) / 100;
		$Margin[2] = $this->Border + $this->Height * ( $this->rnd( ) * $this->Offset ) / 100;
		$Margin[3] = $this->Height - $this->Border - $this->Height * ( $this->rnd( ) * $this->Offset ) / 100;
		$vWidth = intval( $Margin[1] - $Margin[0] );
		$vHeight = intval( $Margin[3] - $Margin[2] );
		$vStartX = intval( ( $DotData[$pIndex][0] - 1 ) * $vWidth / 100 );
		$vStartY = intval( ( $DotData[$pIndex][1] - 1 ) * $vHeight / 100 );
		$i = 1;
		for ( ;	$i <= count( $DotData[$pIndex] ) / 2;	$i++	)
		{
			if ( $DotData[$pIndex][2 * $i - 2] != 0 && $DotData[$pIndex][2 * $i] != 0 )
			{
				$vEndX = ( $DotData[$pIndex][2 * $i] - 1 ) * $vWidth / 100;
				$vEndY = ( $DotData[$pIndex][2 * $i + 1] - 1 ) * $vHeight / 100;
				$vDX = $vEndX - $vStartX;
				$vDY = $vEndY - $vStartY;
				if ( $vDX == 0 )
				{
					$vAngle = $this->sgn( $vDY ) * 3.14 / 2;
				}
				else
				{
					$vAngle = atan( $vDY / $vDX );
				}
				if ( sin( $vAngle ) == 0 )
				{
					$vLength = $vDX;
				}
				else
				{
					$vLength = $vDY / sin( $vAngle );
				}
				$vAngle = $vAngle + ( $this->rnd( ) - 0.5 ) * 2 * $this->Angle * 3.14 * 2 / 100;
				$vDX = intval( cos( $vAngle ) * $vLength );
				$vDY = intval( sin( $vAngle ) * $vLength );
				if ( abs( $vDY ) < abs( $vDX ) )
				{
					$vDeltaT = abs( $vDX );
				}
				else
				{
					$vDeltaT = abs( $vDY );
				}
				$j = 1;
				for ( ;	$j <= $vDeltaT;	$j++	)
				{
					$this->setdot( $Margin[0] + $vStartX + $j * $vDX / $vDeltaT, $Margin[2] + $vStartY + $j * $vDY / $vDeltaT );
				}
				$vStartX = $vStartX + $vDX;
				$vStartY = $vStartY + $vDY;
			}
		}
	}

	function output( )
	{
		$out = "";
		$out .= "GIF";
		$out .= "89a";
		$out .= chr( $this->Width % 256 ).chr( $this->Width / 256 % 256 );
		$out .= chr( $this->Height % 256 ).chr( $this->Height / 256 % 256 );
		$out .= chr( 128 ).chr( 0 ).chr( 0 );
		$out .= chr( 238 ).chr( 238 ).chr( 238 );
		$out .= chr( 0 ).chr( 0 ).chr( 0 );
		$out .= ",";
		$out .= chr( 0 ).chr( 0 ).chr( 0 ).chr( 0 );
		$out .= chr( $this->Width % 256 ).chr( $this->Width / 256 % 256 );
		$out .= chr( $this->Height % 256 ).chr( $this->Height / 256 % 256 );
		$out .= chr( 0 ).chr( 7 ).chr( 255 );
		$y = 0;
		for ( ;	$y < $this->Height;	$y++	)
		{
			$x = 0;
			for ( ;	$x < $this->Width;	$x++	)
			{
				if ( $this->rnd( ) < $this->Noisy / 100 )
				{
					$out .= chr( 1 - $this->Graph[$x][$y] );
				}
				else if ( $x * ( $x - $this->Width ) == 0 || $y * ( $y - $this->Height ) == 0 )
				{
					$out .= chr( $this->Graph[$x][$y] );
				}
				else if ( $this->Graph[$x - 1][$y] == 1 || $this->Graph[$x][$y] || $this->Graph[$x][$y - 1] == 1 )
				{
					$out .= chr( 1 );
				}
				else
				{
					$out .= chr( 0 );
				}
				if ( ( $y * $this->Width + $x + 1 ) % 126 == 0 )
				{
					$out .= chr( 128 );
					$i++;
				}
				if ( ( $y * $this->Width + $x + $i + 1 ) % 255 == 0 )
				{
					if ( 255 < $this->Width * $this->Height - $y * $this->Width - $x - 1 )
					{
						$out .= chr( 255 );
					}
					else
					{
						$out .= chr( $this->Width * $this->Height % 255 );
					}
				}
			}
		}
		$out .= chr( 128 ).chr( 0 ).chr( 129 ).chr( 0 ).chr( 59 );
		header( "Expires: -9999" );
		header( "Pragma: no-cache" );
		header( "cache-ctrol: no-cache" );
		header( "ContentType: image/gif" );
		echo $out;
	}

}

error_reporting( E_ERROR | E_WARNING | E_PARSE );
$verify = new verifycode( );
$code = $_COOKIE['SYSIMG'];
$code = strrev( $code ) + 5 * 2 - 9;
$code = substr( $code, 0, 4 );
$verify->vcode( $code );
$verify->output( );
?>