[TASK] Wrote classes and implemented about 50% of the whole idea.

BoxImage.class.php

@@ -0,0 +1,148 @@
+<?php
+/**
+ * This class will create a square png according to a given size and fill it with pixels.
+ * @author JPT
+ */
+class BoxImage {
+
+	/**
+	 * @var resource
+	 */
+	protected $image;
+
+	/**
+	 * @var int
+	 */
+	protected $width;
+
+	/**
+	 * @var int
+	 */
+	protected $height;
+
+	/**
+	 * @var int
+	 */
+	protected $pointer_x;
+
+	/**
+	 * @var int
+	 */
+	protected $pointer_y;
+
+	/**
+	 * Basic constructor.
+	 * @param int $size
+	 * @return void
+	 * @throws Exception
+	 */
+	public function __construct($size) {
+		if($size < 1) throw new Exception("This cannot be done!");
+
+			//determine width+height
+		$this->height = ceil(sqrt($size));
+		$this->width = $this->height;
+
+			//prepare image for PNG with transparency using the calculated size.
+		$this->image = imagecreatetruecolor($this->width, $this->height);
+
+			//set the alpha stuff
+		imagesavealpha($this->image, TRUE);
+		imagealphablending($this->image, FALSE);
+
+			//initialize pointers.
+		$this->resetPointer();
+	}
+
+	/**
+	 * Resets pointer.
+	 * @return void
+	 */
+	public function resetPointer() {
+		$this->pointer_x = 0;
+		$this->pointer_y = 0;
+	}
+
+	/**
+	 * Fills the image with the given color.
+	 * @param int $r 0 - 255
+	 * @param int $g 0 - 255
+	 * @param int $b 0 - 255
+	 * @param int $a 127 - 0
+	 * @return void
+	 */
+	public function fillImage($r, $g, $b, $a) {
+		$color = imagecolorallocatealpha($this->image, $r, $g, $b, $a);
+		imagefill($this->image, 0, 0, $color);
+		imagecolordeallocate($this->image, $color);
+	}
+
+	/**
+	 * Sets the current pixel to the given color, moves the "pointer" of the image.
+	 * @param int $r 0 - 255
+	 * @param int $g 0 - 255
+	 * @param int $b 0 - 255
+	 * @param int $a 127 - 0
+	 * @return void
+	 */
+	public function setCurrentPixel($r, $g, $b, $a) {
+		$color = imagecolorallocatealpha($this->image, $r, $g, $b, $a);
+		imagesetpixel($this->image, $this->pointer_x, $this->pointer_y, $color);
+		imagecolordeallocate($this->image, $color);
+	}
+
+	/**
+	 * Moves the x and y pointers of the image according to the offset.
+	 * @param int $offset
+	 * @throws Exception
+	 * @return void
+	 */
+	public function movePointer($offset) {
+		if($offset === 0) return;
+		if($offset > 0) $step = 1;
+		if($offset < 0){
+			$step = -1;
+			$offset = $offset * -1;
+		}
+
+		if(!isset($step)) throw new Exception("What the fuck?");
+
+		for($i = $offset; $i > 0; $i--) {
+				//if we go back
+			if($step === -1) {
+					//decrease x-pointer
+				$this->pointer_x--;
+					//handle y-jumps
+				if($this->pointer_x === 0) {
+					$this->pointer_x = $width;
+					$this->pointer_y--;
+						//out of range?
+					if($this->pointer_y < 0) throw new Exception("Out of range! (width)");
+				}
+
+				//if we go forward
+			} elseif($step === 1) {
+			 		//increase x-pointer
+				$this->pointer_x++;
+					//handle y-jumps
+				if($this->pointer_x === $this->width) {
+					$this->pointer_x = 0;
+					$this->pointer_y++;
+						//out of range?
+					if($this->pointer_y > $this->height) throw new Exception("Out of range! (height)");
+				}
+			} //end of if
+		} //end of for
+	} //end of function
+
+	/**
+	 * Writes the PNG to a file.
+	 * @param string $filename
+	 * @param int $compression 0-9
+	 * @return boolean
+	 */
+	public function writeToFile($filename, $compression) {
+		return imagepng($this->image, $filename, $compression);
+	}
+
+}

CharColorConverter.class.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * This class contains some library-functions for converting a string to a color [depending on certain modes].
+ * @author JPT
+ */
+class CharColorConverter {
+
+	/**
+	 * Returns an array with RGB for the corresponding index.
+	 * @param int $index Index from 0 to 1530. (Everything above will result the same)
+	 * @return array
+	 * TODO: Function to reverse this one.
+	 * NOTICE: I will use 0 - 1275 for human readability;
+	 */
+	protected function index2rgb($index = 0) {
+		$r = 255;
+		$g = 0;
+		$b = 0;
+
+			//the elseif fixes a glitch.
+		for($i = 0; $i < $index; $i++) {
+				if($r <   255 && $g ===   0 && $b === 255) $r++;
+			elseif($r === 255 && $g <   255 && $b ===   0) $g++;
+			elseif($r ===   0 && $g === 255 && $b <   255) $b++;
+			elseif($r >     0 && $g === 255 && $b ===   0) $r--;
+			elseif($r ===   0 && $g >     0 && $b === 255) $g--;
+			elseif($r === 255 && $g ===   0 && $b >     0) $b--;
+
+			//DEBUG
+			//$k = $i + 1;
+			//echo "I:$k\t$r,$g,$b\r\n";
+		}
+
+		return array($r, $g, $b);
+	}
+
+	/**
+	 * Converts a single char to a string.
+	 * @param string $string
+	 * @return array RGB
+	 */
+	public function charToColor($string) {
+		if(strlen($string) === 0) throw new Exception("Empty string given!");
+		$index = ord($string) * 5;
+		$color = $this->index2rgb($index);
+		return $color;
+	}
+}
+
+?>

File2Img.php

@@ -1,6 +1,9 @@
 <?php
+require "val2rgb.php";
+
 $file = $argv[1];
-if(file_exists($file) === FALSE) die("Nein\n");
+if(file_exists($file) === FALSE) die("Error: file does not exist!\n");
+
 $data = file_get_contents($file);
 $size = strlen($data);
 $foobar = array();

FileImageConverter.class.php

@@ -0,0 +1,104 @@
+<?php
+/**
+ * This class will be able to convert a file into an image.
+ * @author JPT
+ */
+class FileImageConverter {
+
+	/**
+	 * @var BoxImage
+	 */
+	protected $image;
+
+	/**
+	 * @var CharColorConverter
+	 */
+	protected $colorConverter;
+
+	/**
+	 * Default constructor
+	 * @return void
+	 */
+	public function __construct() {
+		$this->colorConverter = new CharColorConverter();
+	}
+
+	/**
+	 * Processes the given file, returns the filename of the resulting PNG-File.
+	 * @param string $filename
+	 * @return void
+	 * @throws Exception
+	 */
+	public function convertFile($filename) {
+		if(file_exists($filename) === FALSE) throw new Exception("Invalid filename given!");
+
+			//get file data
+		$filesize = filesize($filename);
+		$md5 = md5_file($filename);
+
+		$new_filename = "result.png";
+
+		$header = "";
+		for($i = 0;$i < 255;$i += 5) {
+			$header .= chr($i);
+		}
+		$header .= chr(0);
+		$header .= $filesize;
+		$header .= chr(0);
+		$header .= $md5;
+
+			//header done, now read the file content
+		$content = file_get_contents($filename);
+
+			//get size for the image
+		$size = strlen($header) + 1 + $filesize;
+
+			//create and prepare image
+		$this->image = new BoxImage($size);
+		$this->image->fillImage(0,0,0,127);
+
+			//header first
+		$this->addDataToImage($header);
+
+			//magic pixel
+		$this->image->setCurrentPixel(0,0,0,127);
+		$this->image->movePointer(1);
+
+			//content
+		$this->addDataToImage($content);
+
+			//save image
+		$this->image->writeToFile($new_filename, 0);
+
+			//clean up
+		unset($this->image);
+	}
+
+	/**
+	 * Converts data and adds it to the image.
+	 * @param string $data
+	 * @return void
+	 */
+	protected function addDataToImage($data) {
+		try {
+			$strlen = strlen($data);
+			for($i = 0;$i < $strlen; $i++) {
+				$char = substr($data, $i, 1);
+					//convert char to color
+				list($r, $g, $b) = $this->colorConverter->charToColor($char);
+					//set the pixel
+				$this->image->setCurrentPixel($r, $g, $b, 0);
+					//move the pointer
+				$this->image->movePointer(1);
+			}
+
+		} catch (Exception $e) {
+				//TODO: handle weird shit?
+			echo "Caught Exception:\n";
+			echo $e;
+		}
+
+	}
+
+}
+?>

Main.php

@@ -0,0 +1,9 @@
+<?php
+require_once "CharColorConverter.class.php";
+require_once "BoxImage.class.php";
+require_once "FileImageConverter.class.php";
+
+$converter = new FileImageConverter();
+$converter->convertFile("test.jpg");
+
+?>

val2rgb.php

@@ -1,27 +0,0 @@
-<?php
-
-$index = $argv[1];
-
-$r = 255;
-$g = 0;
-$b = 0;
-for($i = 0; $i < $index; $i++) {
-
-        echo "I:$i\tR:$r G:$g B:$b \n";
-
-        if($g === 0 && $b === 255 && $r < 255) $r++;
-        if($b === 0 && $g === 255 && $r > 0) $r--;
-
-        if($b === 0 && $r === 255 && $g < 255) $g++;
-        if($r === 0 && $b === 255 && $g > 0) $g--;
-
-        if($r === 0 && $g === 255 && $b < 255) $b++;
-        if($g === 0 && $r === 255 && $b > 0) $b--;
-
-}
-echo "\n";
-print_r(array($i, $r, $g, $b));
-
-// 0 - 1527
-
-?>