<?php
/**
*
* @ This file is created by deZender.Net
* @ deZender (PHP5 Decoder for ionCube Encoder)
*
* @	Version			:	1.1.5.0
* @	Author			:	DeZender
* @	Release on		:	09.06.2012
* @	Official site	:	http://DeZender.Net
*
*/

	class FilterPredictor {
		var $alwaysWritePredictorByte = true;

		function error($msg) {
			exit( $msg );
		}

		function paethPredictor($left, $above, $upperLeft) {
			$p = $left + $above - $upperLeft;
			$pLeft = abs( $p - $left );
			$pAbove = abs( $p - $above );
			$pUpperLeft = abs( $p - $upperLeft );

			if (( $pLeft <= $pAbove && $pLeft <= $pUpperLeft )) {
				return $left;
			}


			if ($pAbove <= $pUpperLeft) {
				return $above;
			}

			return $upperLeft;
		}

		function decode($data, $predictor = 0, $columns = null, $colors = null, $bitsPerComponent = null) {
			if ($predictor == 1) {
				return $data;
			}


			if ($predictor == 2) {
				return $this->error( 'TIFF predictor not yet supported' );
			}


			if (( 10 <= $predictor && $predictor <= 15 )) {
				$columns = (is_null( $columns ) ? 1 : (int)$columns);
				$colors = (is_null( $colors ) ? 1 : (int)$colors);
				$bitsPerComponent = (is_null( $bitsPerComponent ) ? 8 : (int)$bitsPerComponent);
				$bytesPerPixel = $colors * $bitsPerComponent / 8;
				$bytesPerRow = (int)( $colors * $columns * $bitsPerComponent + 7 ) / 8;
				$out = '';
				$currRowString = '';
				$offset = 0;
				$currRowData = array(  );
				$priorRowData = array_fill( 0, $bytesPerRow, 0 );
				$currPredictor = $predictor;
				$eof = false;

				while (!$eof) {
					if (( $this->alwaysWritePredictorByte || $predictor == 15 )) {
						$currPredictor = ord( substr( $data, $offset++, 1 ) );

						if (!is_null( $currPredictor )) {
							$currPredictor += 10;
						} else {
							$eof = true;
						}
					}


					if (!$eof) {
						$currRowString = substr( $data, $offset, $bytesPerRow );

						if (strlen( $currRowString ) != $bytesPerRow) {
							$eof = true;

							if (strlen( $currRowString ) != 0) {
								return $this->error( 'Could not read complete row while decoding data' );
							}
						}


						if (!$eof) {
							$currRowData = array(  );
							$currRowLength = strlen( $currRowString );
							$i = 0;

							while ($i < $currRowLength) {
								$currRowData[$i] = ord( $currRowString[$i] );
								++$i;
							}

							switch ($currPredictor) {
								case 10: {
									break;
								}

								case 11: {
									$i = $bytesPerPixel;

									while ($i < $bytesPerRow) {
										$currRowData[$i] = $currRowData[$i] + $currRowData[$i - $bytesPerPixel] & 255;
										++$i;
									}

									break;
								}

								case 12: {
									$i = 0;

									while ($i < $bytesPerRow) {
										$currRowData[$i] = $currRowData[$i] + $priorRowData[$i] & 255;
										++$i;
									}

									break;
								}

								case 13: {
									$i = 0;

									while ($i < $bytesPerPixel) {
										$currRowData[$i] = $currRowData[$i] + floor( $priorRowData[$i] / 2 ) & 255;
										++$i;
									}

									$i = $bytesPerPixel;

									while ($i < $bytesPerRow) {
										$currRowData[$i] = $currRowData[$i] + floor( ( $currRowData[$i - $bytesPerPixel] + $priorRowData[$i] ) / 2 ) & 255;
										++$i;
									}

									break;
								}

								case 14: {
									$i = 0;

									while ($i < $bytesPerRow) {
										$left = ($i < $bytesPerPixel ? 0 : $currRowData[$i - $bytesPerPixel]);
										$above = $priorRowData[$i];
										$upperLeft = ($i < $bytesPerPixel ? 0 : $priorRowData[$i - $bytesPerPixel]);
										$predicted = $this->paethPredictor( $left, $above, $upperLeft );
										$currRowData[$i] = $currRowData[$i] + $predicted & 255;
										++$i;
									}

									break;
								}

								default: {
									$this->error( 'unrecognized png predictor (' . $currPredictor . ') while decoding data' );
								}
							}

							return ;
							$i = 0;

							while ($i < $currRowLength) {
								$out .= chr( $currRowData[$i] );
								++$i;
							}

							$priorRowData = $currRowData;
							$offset += $bytesPerRow;
							continue;
						}

						continue;
					}
				}

				return $out;
			}

			return $this->error( 'unrecognized predictor: ' . $predictor );
		}
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