Initial commit to new repo (carried over from: https://github.com/ryancramerdesign/ProcessWire/tree/devns)

2025-08-10 16:54:44 +02:00 · 2016-09-02 14:55:17 -04:00
parent cfae5fc6f3
commit bac5b0de5d
1691 changed files with 279091 additions and 1 deletions
--- a/wire/core/PWPNG.php
+++ b/wire/core/PWPNG.php
@@ -0,0 +1,151 @@
+<?php namespace ProcessWire;
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// parsePng is a part of FPDF v1.81 - 2015-12-20
+// Author: Olivier PLATHEY
+// http://fpdf.org/
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software to use, copy, modify, distribute, sublicense, and/or sell
+// copies of the software, and to permit persons to whom the software is furnished
+// to do so.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// PNG Inspector 
+// original code from FPDF modified in April 2016 by Horst Nogajski
+// to be used for png image inspection in ProcessWire 3+ (http://processwire.com/)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+class PWPNG {
+	public $info = array();
+	public $errors = array();
+	protected $extended;
+	public function __construct($extended = false) {
+		$this->extended = $extended;
+	}
+	public function loadFile($lpszFileName) {
+		// READ FILE
+		if(!($fh = @fopen($lpszFileName, 'rb'))) {
+			$this->Error('Can\'t open image file: '.$file);
+			return false;
+		}
+		$ret = (false === $this->_parsepngstream($fh, basename($lpszFileName))) ? false : true;
+		fclose($fh);
+		return $ret;
+	}
+	protected function _parsepngstream($f, $file) {
+		// Check signature
+		if($this->_readstream($f, 8) != chr(137) . 'PNG' . chr(13) . chr(10) . chr(26) . chr(10)) {
+			$this->Error('Not a PNG file: '.$file);
+			return false;
+		}
+		// Read header chunk
+		$this->_readstream($f, 4);
+		if($this->_readstream($f, 4) != 'IHDR') {
+			$this->Error('Incorrect PNG file: '.$file);
+			return false;
+		}
+		$w = $this->_readint($f);
+		$h = $this->_readint($f);
+		$bpc = ord($this->_readstream($f, 1));
+		//if($bpc > 8) {
+		//	$this->Error('16-bit depth not supported: '.$file);
+		//}
+		$ct = ord($this->_readstream($f, 1));
+		if($ct == 0 || $ct == 4) {
+			$colspace = 'DeviceGray';
+		} else if($ct == 2 || $ct == 6) {
+			$colspace = 'DeviceRGB';
+		} else if($ct == 3) {
+			$colspace = 'Indexed';
+		} else {
+			$this->Error('Unknown color type: '.$file);
+		}
+		if(ord($this->_readstream($f, 1)) != 0) $this->Error('Unknown compression method: '.$file);
+		if(ord($this->_readstream($f, 1)) != 0) $this->Error('Unknown filter method: '.$file);
+		$interlaced = ord($this->_readstream($f, 1)) != 0 ? true : false;
+		$this->_readstream($f, 4);
+		$dp = '/Predictor 15 /Colors '.($colspace=='DeviceRGB' ? 3 : 1).' /BitsPerComponent '.$bpc.' /Columns '.$w;
+		// Scan chunks looking for palette, transparency and image data
+		// http://www.w3.org/TR/2003/REC-PNG-20031110/#table53
+		// http://www.libpng.org/pub/png/book/chapter11.html#png.ch11.div.6
+		$pal = '';
+		$trns = '';
+		$counter = 0;
+		do {
+			$n = $this->_readint($f);
+			$counter += $n;
+			$type = $this->_readstream($f,4);
+
+			if($type=='PLTE') {
+
+				// Read palette
+				$pal = $this->_readstream($f, $n);
+				$this->_readstream($f,4);
+
+			} else if($type == 'tRNS') {
+
+				// Read transparency info
+				$t = $this->_readstream($f,$n);
+				if($ct == 0) {
+					$trns = array(ord(substr($t,1,1)));
+				} else if($ct == 2) {
+					$trns = array(ord(substr($t, 1, 1)), ord(substr($t, 3, 1)), ord(substr($t, 5, 1)));
+				} else {
+					$pos = strpos($t, chr(0));
+					if($pos !== false) $trns = array($pos);
+				}
+				$this->_readstream($f, 4);
+
+			} else if($type == 'IEND' || $type == 'IDAT' || $counter >= 2048) {
+
+				break;
+
+			} else {
+
+				$this->_readstream($f,$n+4);
+			}
+		} while($n);
+		if($colspace == 'Indexed' && empty($pal)) $this->Error('Missing palette in '.$file);
+
+		$this->info = array(
+			'width' => $w,
+			'height' => $h,
+			'colspace' => $colspace,
+			'channels' => $ct,
+			'bits' => $bpc,
+			'dp' => $dp,
+			'palette' => utf8_encode($pal),
+			'trans' => $trns,
+			'alpha' => $ct >= 4 ? true : false,
+			'interlace' => $interlaced,
+			'errors' => $this->errors
+		);
+
+		return true;
+	}
+
+	protected function _readstream($f, $n) {
+		// Read n bytes from stream
+		$res = '';
+		while($n > 0 && !feof($f)) {
+			$s = fread($f, $n);
+			if($s === false) {
+				$this->Error('Error while reading stream');
+				return;
+			}
+			$n -= strlen($s);
+			$res .= $s;
+		}
+		if($n > 0) $this->Error('Unexpected end of stream');
+		return $res;
+	}
+	protected function _readint($f) {
+		// Read a 4-byte integer from stream
+		$a = unpack('Ni',$this->_readstream($f,4));
+		return $a['i'];
+	}
+	protected function Error($msg) {
+		$this->errors[] = $msg;
+	}
+
+}