From 27c48ff31e5ecc635f0620711699db996b3e996c Mon Sep 17 00:00:00 2001
From: root
Date: Thu, 30 Jul 2020 05:59:43 -0400
Subject: Agregado soporte para WebP

---
 cgi/img.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/cgi/img.py b/cgi/img.py
index 48d4277..1c57e37 100644
--- a/cgi/img.py
+++ b/cgi/img.py
@@ -31,6 +31,7 @@ def processImage(post, data, t, originalname, spoiler=False):
 
     # get image information
     content_type, width, height, size, extra = getImageInfo(data)
+    logging.info("{} {} {}".format(content_type, width, height))
 
     # check the size is fine
     if size > int(board["maxsize"])*1024:
@@ -291,6 +292,22 @@ def getImageInfo(data):
         except ValueError:
             pass
 
+    # handle WebP
+    if data[:4] == b'RIFF' and data[8:12] == b'WEBP':
+        chunk = data[12:]
+        if chunk[:4] == b"VP8 " and chunk[11:14] == b"\x9d\x01\x2a":
+            # Lossy VP8
+            w, h = struct.unpack("HH", chunk[14:18])
+            width  = w & 0x3fff
+            height = h & 0x3fff
+            content_type = "image/webp"
+        elif chunk[:4] == b"VP8L":
+            # Lossless VP8
+            b0, b1, b2, b3 = struct.unpack("BBBB", chunk[9:13])
+            width  = 1 + (((b1 & 0x3F) << 8) | b0)
+            height = 1 + (((b3 & 0xF) << 10) | (b2 << 2) | ((b1 & 0xC0) >> 6))
+            content_type = "image/webp"
+
     # handle WebM
     elif (size >= 4) and data.startswith("\x1A\x45\xDF\xA3"):
         content_type = "video/webm"
-- 
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