Merge branch 'feature/upstream' into develop

1 files changed, 16 insertions, 6 deletions

diff --git a/src/photos/JfifSupport.vala b/src/photos/JfifSupport.vala
index 2861353..5ea64a5 100644
--- a/src/photos/JfifSupport.vala
+++ b/src/photos/JfifSupport.vala
@@ -201,16 +201,25 @@ namespace Jpeg {
     }
     
     public bool is_jpeg(File file) throws Error {
-        FileInputStream fins = file.read(null);
-        
+        var fins = file.read(null);
+        return is_jpeg_stream(fins);
+    }
+
+    public bool is_jpeg_stream(InputStream ins) throws Error {
         Marker marker;
-        int segment_length = read_marker(fins, out marker);
+        int segment_length = read_marker(ins, out marker);
         
         // for now, merely checking for SOI
         return (marker == Marker.SOI) && (segment_length == 0);
     }
 
-    private int read_marker(FileInputStream fins, out Jpeg.Marker marker) throws Error {
+    public bool is_jpeg_bytes(Bytes bytes) throws Error {
+        var mins = new MemoryInputStream.from_bytes(bytes);
+
+        return is_jpeg_stream(mins);
+    }
+
+    private int read_marker(InputStream fins, out Jpeg.Marker marker) throws Error {
         marker = Jpeg.Marker.INVALID;
         
         DataInputStream dins = new DataInputStream(fins);
@@ -226,8 +235,9 @@ namespace Jpeg {
         }
         
         uint16 length = dins.read_uint16();
-        if (length < 2) {
-            debug("Invalid length %Xh at ofs %" + int64.FORMAT + "Xh", length, fins.tell() - 2);
+        if (length < 2 && fins is Seekable) {
+            debug("Invalid length %Xh at ofs %" + int64.FORMAT + "Xh", length,
+                    (fins as Seekable).tell() - 2);
             
             return -1;
         }