1 files changed, 69 insertions, 0 deletions
diff --git a/atoidepoc/tools/image.py b/atoidepoc/tools/image.py
new file mode 100644
index 0000000..f995506
--- /dev/null
+++ b/atoidepoc/tools/image.py
@@ -0,0 +1,69 @@
+
+# python import
+import struct, StringIO
+
+def get_image_info(path):
+    """Tricky method found on Internet that returns the image info from a given
+    raw image data.
+    """
+    # read file
+    _f = open(path)
+    _data = _f.read()
+    _f.close()
+    #
+    size = len(_data)
+    height = None
+    width = None
+    content_type = None
+
+    # handle GIFs
+    if (size >= 10) and _data[:6] in ('GIF87a', 'GIF89a'):
+        # Check to see if content_type is correct
+        content_type = 'image/gif'
+        w, h = struct.unpack("<HH", _data[6:10])
+        width = int(w)
+        height = int(h)
+
+    # See PNG 2. Edition spec (http://www.w3.org/TR/PNG/)
+    # Bytes 0-7 are below, 4-byte chunk length, then 'IHDR'
+    # and finally the 4-byte width, height
+    elif ((size >= 24) and _data.startswith('\211PNG\r\n\032\n')
+          and (_data[12:16] == 'IHDR')):
+        content_type = 'image/png'
+        w, h = struct.unpack(">LL", _data[16:24])
+        width = int(w)
+        height = int(h)
+
+    # Maybe this is for an older PNG version.
+    elif (size >= 16) and _data.startswith('\211PNG\r\n\032\n'):
+        # Check to see if we have the right content type
+        content_type = 'image/png'
+        w, h = struct.unpack(">LL", _data[8:16])
+        width = int(w)
+        height = int(h)
+
+    # handle JPEGs
+    elif (size >= 2) and _data.startswith('\377\330'):
+        content_type = 'image/jpeg'
+        jpeg = StringIO.StringIO(_data)
+        jpeg.read(2)
+        b = jpeg.read(1)
+        try:
+            while (b and ord(b) != 0xDA):
+                while (ord(b) != 0xFF): b = jpeg.read(1)
+                while (ord(b) == 0xFF): b = jpeg.read(1)
+                if (ord(b) >= 0xC0 and ord(b) <= 0xC3):
+                    jpeg.read(3)
+                    h, w = struct.unpack(">HH", jpeg.read(4))
+                    break
+                else:
+                    jpeg.read(int(struct.unpack(">H", jpeg.read(2))[0])-2)
+                b = jpeg.read(1)
+            width = int(w)
+            height = int(h)
+        except struct.error:
+            pass
+        except ValueError:
+            pass
+
+    return content_type, width, height