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extend/barcode/class/drawer/BCGDrawJPG.php

@@ -0,0 +1,102 @@
+<?php
+/**
+ *--------------------------------------------------------------------
+ *
+ * Image Class to draw JPG images with possibility to set DPI
+ *
+ *--------------------------------------------------------------------
+ * Copyright (C) Jean-Sebastien Goupil
+ * http://www.barcodephp.com
+ */
+include_once('BCGDraw.php');
+
+if (!function_exists('file_put_contents')) {
+    function file_put_contents($filename, $data) {
+        $f = @fopen($filename, 'w');
+        if (!$f) {
+            return false;
+        } else {
+            $bytes = fwrite($f, $data);
+            fclose($f);
+            return $bytes;
+        }
+    }
+}
+
+class BCGDrawJPG extends BCGDraw {
+    private $dpi;
+    private $quality;
+
+    /**
+     * Constructor.
+     *
+     * @param resource $im
+     */
+    public function __construct($im) {
+        parent::__construct($im);
+    }
+
+    /**
+     * Sets the DPI.
+     *
+     * @param int $dpi
+     */
+    public function setDPI($dpi) {
+        if(is_int($dpi)) {
+            $this->dpi = max(1, $dpi);
+        } else {
+            $this->dpi = null;
+        }
+    }
+
+    /**
+     * Sets the quality of the JPG.
+     *
+     * @param int $quality
+     */
+    public function setQuality($quality) {
+        $this->quality = $quality;
+    }
+
+    /**
+     * Draws the JPG on the screen or in a file.
+     */
+    public function draw() {
+        ob_start();
+        imagejpeg($this->im, null, $this->quality);
+        $bin = ob_get_contents();
+        ob_end_clean();
+
+        $this->setInternalProperties($bin);
+
+        if (empty($this->filename)) {
+            echo $bin;
+        } else {
+            file_put_contents($this->filename, $bin);
+        }
+    }
+
+    private function setInternalProperties(&$bin) {
+        $this->internalSetDPI($bin);
+        $this->internalSetC($bin);
+    }
+
+    private function internalSetDPI(&$bin) {
+        if ($this->dpi !== null) {
+            $bin = substr_replace($bin, pack("Cnn", 0x01, $this->dpi, $this->dpi), 13, 5);
+        }
+    }
+
+    private function internalSetC(&$bin) {
+        if(strcmp(substr($bin, 0, 4), pack('H*', 'FFD8FFE0')) === 0) {
+            $offset = 4 + (ord($bin[4]) << 8 | ord($bin[5]));
+            $firstPart = substr($bin, 0, $offset);
+            $secondPart = substr($bin, $offset);
+            $cr = pack('H*', 'FFFE004447656E657261746564207769746820426172636F64652047656E657261746F7220666F722050485020687474703A2F2F7777772E626172636F64657068702E636F6D');
+            $bin = $firstPart;
+            $bin .= $cr;
+            $bin .= $secondPart;
+        }
+    }
+}
+?>