phpthumb.functions.php

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<?php
class phpthumb_functions {

	function user_function_exists($functionname) {
		if (function_exists('get_defined_functions')) {
			static $get_defined_functions = array();
			if (empty($get_defined_functions)) {
				$get_defined_functions = get_defined_functions();
			}
			return in_array(strtolower($functionname), $get_defined_functions['user']);
		}
		return function_exists($functionname);
	}

	function builtin_function_exists($functionname) {
		if (function_exists('get_defined_functions')) {
			static $get_defined_functions = array();
			if (empty($get_defined_functions)) {
				$get_defined_functions = get_defined_functions();
			}
			return in_array(strtolower($functionname), $get_defined_functions['internal']);
		}
		return function_exists($functionname);
	}

	function version_compare_replacement_sub($version1, $version2, $operator='') {
		// If you specify the third optional operator argument, you can test for a particular relationship.
		// The possible operators are: <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <>, ne respectively.
		// Using this argument, the function will return 1 if the relationship is the one specified by the operator, 0 otherwise.

		// If a part contains special version strings these are handled in the following order: dev < (alpha = a) < (beta = b) < RC < pl
		static $versiontype_lookup = array();
		if (empty($versiontype_lookup)) {
			$versiontype_lookup['dev']   = 10001;
			$versiontype_lookup['a']     = 10002;
			$versiontype_lookup['alpha'] = 10002;
			$versiontype_lookup['b']     = 10003;
			$versiontype_lookup['beta']  = 10003;
			$versiontype_lookup['RC']    = 10004;
			$versiontype_lookup['pl']    = 10005;
		}
		if (isset($versiontype_lookup[$version1])) {
			$version1 = $versiontype_lookup[$version1];
		}
		if (isset($versiontype_lookup[$version2])) {
			$version2 = $versiontype_lookup[$version2];
		}

		switch ($operator) {
			case '<':
			case 'lt':
				return intval($version1 < $version2);
				break;
			case '<=':
			case 'le':
				return intval($version1 <= $version2);
				break;
			case '>':
			case 'gt':
				return intval($version1 > $version2);
				break;
			case '>=':
			case 'ge':
				return intval($version1 >= $version2);
				break;
			case '==':
			case '=':
			case 'eq':
				return intval($version1 == $version2);
				break;
			case '!=':
			case '<>':
			case 'ne':
				return intval($version1 != $version2);
				break;
		}
		if ($version1 == $version2) {
			return 0;
		} elseif ($version1 < $version2) {
			return -1;
		}
		return 1;
	}

	function version_compare_replacement($version1, $version2, $operator='') {
		if (function_exists('version_compare')) {
			// built into PHP v4.1.0+
			return version_compare($version1, $version2, $operator);
		}

		// The function first replaces _, - and + with a dot . in the version strings
		$version1 = strtr($version1, '_-+', '...');
		$version2 = strtr($version2, '_-+', '...');

		// and also inserts dots . before and after any non number so that for example '4.3.2RC1' becomes '4.3.2.RC.1'.
		// Then it splits the results like if you were using explode('.',$ver). Then it compares the parts starting from left to right.
		$version1 = eregi_replace('([0-9]+)([A-Z]+)([0-9]+)', '\\1.\\2.\\3', $version1);
		$version2 = eregi_replace('([0-9]+)([A-Z]+)([0-9]+)', '\\1.\\2.\\3', $version2);

		$parts1 = explode('.', $version1);
		$parts2 = explode('.', $version1);
		$parts_count = max(count($parts1), count($parts2));
		for ($i = 0; $i < $parts_count; $i++) {
			$comparison = phpthumb_functions::version_compare_replacement_sub($version1, $version2, $operator);
			if ($comparison != 0) {
				return $comparison;
			}
		}
		return 0;
	}

	function phpinfo_array() {
		static $phpinfo_array = array();
		if (empty($phpinfo_array)) {
			ob_start();
			phpinfo();
			$phpinfo = ob_get_contents();
			ob_end_clean();
			$phpinfo_array = explode("\n", $phpinfo);
		}
		return $phpinfo_array;
	}

	function exif_info() {
		static $exif_info = array();
		if (empty($exif_info)) {
			// based on code by johnschaefer at gmx dot de
			// from PHP help on gd_info()
			$exif_info = array(
				'EXIF Support'           => '',
				'EXIF Version'           => '',
				'Supported EXIF Version' => '',
				'Supported filetypes'    => ''
			);
			$phpinfo_array = phpthumb_functions::phpinfo_array();
			foreach ($phpinfo_array as $line) {
				$line = trim(strip_tags($line));
				foreach ($exif_info as $key => $value) {
					if (strpos($line, $key) === 0) {
						$newvalue = trim(str_replace($key, '', $line));
						$exif_info[$key] = $newvalue;
					}
				}
			}
		}
		return $exif_info;
	}

	function ImageTypeToMIMEtype($imagetype) {
		if (function_exists('image_type_to_mime_type')) {
			return image_type_to_mime_type($imagetype);
		}
		static $image_type_to_mime_type = array(
			1  => 'image/gif',                     // IMAGETYPE_GIF
			2  => 'image/jpeg',                    // IMAGETYPE_JPEG
			3  => 'image/png',                     // IMAGETYPE_PNG
			4  => 'application/x-shockwave-flash', // IMAGETYPE_SWF
			5  => 'image/psd',                     // IMAGETYPE_PSD
			6  => 'image/bmp',                     // IMAGETYPE_BMP
			7  => 'image/tiff',                    // IMAGETYPE_TIFF_II (intel byte order)
			8  => 'image/tiff',                    // IMAGETYPE_TIFF_MM (motorola byte order)
			9  => 'application/octet-stream',      // IMAGETYPE_JPC
			10 => 'image/jp2',                     // IMAGETYPE_JP2
			11 => 'application/octet-stream',      // IMAGETYPE_JPX
			12 => 'application/octet-stream',      // IMAGETYPE_JB2
			13 => 'application/x-shockwave-flash', // IMAGETYPE_SWC
			14 => 'image/iff',                     // IMAGETYPE_IFF
			15 => 'image/vnd.wap.wbmp',            // IMAGETYPE_WBMP
			16 => 'image/xbm');                    // IMAGETYPE_XBM

		return (isset($image_type_to_mime_type[$imagetype]) ? $image_type_to_mime_type[$imagetype] : false);
	}

	function HexCharDisplay($string) {
		$len = strlen($string);
		$output = '';
		for ($i = 0; $i < $len; $i++) {
			$output .= ' 0x'.str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
		}
		return $output;
	}

	function IsHexColor($HexColorString) {
		return eregi('^[0-9A-F]{6}$', $HexColorString);
	}

	function ImageColorAllocateAlphaSafe(&$gdimg_hexcolorallocate, $R, $G, $B, $alpha=false) {
		if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.2', '>=') && ($alpha !== false)) {
			return ImageColorAllocateAlpha($gdimg_hexcolorallocate, $R, $G, $B, intval($alpha));
		} else {
			return ImageColorAllocate($gdimg_hexcolorallocate, $R, $G, $B);
		}
	}

	function ImageHexColorAllocate(&$gdimg_hexcolorallocate, $HexColorString, $dieOnInvalid=false, $alpha=false) {
		if (!is_resource($gdimg_hexcolorallocate)) {
			die('$gdimg_hexcolorallocate is not a GD resource in ImageHexColorAllocate()');
		}
		if (phpthumb_functions::IsHexColor($HexColorString)) {
			$R = hexdec(substr($HexColorString, 0, 2));
			$G = hexdec(substr($HexColorString, 2, 2));
			$B = hexdec(substr($HexColorString, 4, 2));
			return phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_hexcolorallocate, $R, $G, $B, $alpha);
		}
		if ($dieOnInvalid) {
			die('Invalid hex color string: "'.$HexColorString.'"');
		}
		return ImageColorAllocate($gdimg_hexcolorallocate, 0x00, 0x00, 0x00);
	}

	function HexColorXOR($hexcolor) {
		return strtoupper(str_pad(dechex(~hexdec($hexcolor) & 0xFFFFFF), 6, '0', STR_PAD_LEFT));
	}

	function GetPixelColor(&$img, $x, $y) {
		return @ImageColorsForIndex($img, @ImageColorAt($img, $x, $y));
	}

	function GrayscaleValue($r, $g, $b) {
		return round(($r * 0.30) + ($g * 0.59) + ($b * 0.11));
	}

	function GrayscalePixel($OriginalPixel) {
		$gray = phpthumb_functions::GrayscaleValue($OriginalPixel['red'], $OriginalPixel['green'], $OriginalPixel['blue']);
		return array('red'=>$gray, 'green'=>$gray, 'blue'=>$gray);
	}

	function ImageResizeFunction(&$dst_im, &$src_im, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH) {
		if (phpthumb_functions::gd_version() >= 2.0) {
			return ImageCopyResampled($dst_im, $src_im, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
		}
		return ImageCopyResized($dst_im, $src_im, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
	}

	function ImageCreateFunction($x_size, $y_size) {
		$ImageCreateFunction = 'ImageCreate';
		if (phpthumb_functions::gd_version() >= 2.0) {
			$ImageCreateFunction = 'ImageCreateTrueColor';
		}
		if (!function_exists($ImageCreateFunction)) {
			return phpthumb::ErrorImage($ImageCreateFunction.'() does not exist - no GD support?');
		}
		if (($x_size <= 0) || ($y_size <= 0)) {
			return phpthumb::ErrorImage('Invalid image dimensions: '.$ImageCreateFunction.'('.$x_size.', '.$y_size.')');
		}
		return $ImageCreateFunction($x_size, $y_size);
	}

	function ImageCopyRespectAlpha(&$dst_im, &$src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct=100) {
		for ($x = $src_x; $x < $src_w; $x++) {
			for ($y = $src_y; $y < $src_h; $y++) {
				$RealPixel    = phpthumb_functions::GetPixelColor($dst_im, $dst_x + $x, $dst_y + $y);