added resource stream detection and initialization, with tests

src/Intervention/Image/AbstractDecoder.php

@@ -70,6 +70,23 @@ abstract class AbstractDecoder
         );
     }
 
+    /**
+     * Init from given stream
+     *
+     * @param $stream
+     * @return \Intervention\Image\Image
+     */
+    public function initFromStream($stream)
+    {
+        if ($data = @stream_get_contents($stream)){
+            return $this->initFromBinary($data);
+        }
+
+        throw new \Intervention\Image\Exception\NotReadableException(
+            "Unable to init from given stream"
+        );
+    }
+
     /**
      * Determines if current source data is GD resource
      *
@@ -148,6 +165,19 @@ abstract class AbstractDecoder
         return (bool) filter_var($this->data, FILTER_VALIDATE_URL);
     }
 
+    /**
+     * Determines if current source data is a stream resource
+     *
+     * @return boolean
+     */
+    public function isStream()
+    {
+        if (!is_resource($this->data)) return false;
+        if (get_resource_type($this->data) !== 'stream') return false;
+
+        return true;
+    }
+
     /**
      * Determines if current source data is binary data
      *
@@ -244,6 +274,9 @@ abstract class AbstractDecoder
             case $this->isUrl():
                 return $this->initFromUrl($this->data);
 
+            case $this->isStream():
+                return $this->initFromStream($this->data);
+
             case $this->isFilePath():
                 return $this->initFromPath($this->data);
 

tests/AbstractDecoderTest.php

@@ -58,6 +58,15 @@ class AbstractDecoderTest extends PHPUnit_Framework_TestCase
         $this->assertFalse($source->isUrl());
     }
 
+    public function testIsStream()
+    {
+        $source = $this->getTestDecoder(fopen(__DIR__ . '/images/test.jpg', 'r'));
+        $this->assertTrue($source->isStream());
+
+        $source = $this->getTestDecoder(null);
+        $this->assertFalse($source->isStream());
+    }
+
     public function testIsBinary()
     {
         $source = $this->getTestDecoder(file_get_contents(__DIR__.'/images/test.jpg'));