From 52ca89e716535006a9d747adafb2e1124e5b23e6 Mon Sep 17 00:00:00 2001
From: Rguihard <remy.guihard@socleo.com>
Date: Tue, 22 Apr 2025 09:21:07 +0200
Subject: [PATCH] Webp image support

Append webp magic number detection on the Image class
---
 .../src/main/java/com/lowagie/text/Image.java | 29 +++++++++++++++++++
 .../java/com/lowagie/text/ImageLoader.java    | 17 +++++++++++
 2 files changed, 46 insertions(+)

diff --git a/openpdf/src/main/java/com/lowagie/text/Image.java b/openpdf/src/main/java/com/lowagie/text/Image.java
index 79f93cb8b..a4e4f338e 100644
--- a/openpdf/src/main/java/com/lowagie/text/Image.java
+++ b/openpdf/src/main/java/com/lowagie/text/Image.java
@@ -482,6 +482,11 @@ public static Image getInstance(URL url) throws BadElementException,
             int c6 = is.read();
             int c7 = is.read();
             int c8 = is.read();
+            // webp
+            int c9 = is.read();
+            int c10 = is.read();
+            int c11 = is.read();
+            int c12 = is.read();
             is.close();
 
             is = null;
@@ -519,6 +524,15 @@ public static Image getInstance(URL url) throws BadElementException,
                 img = ImageLoader.getTiffImage(url);
                 return img;
             }
+            if (c1 == 'R' && c2 == 'I'
+                && c3 == 'F'
+                && c4 == 'F'
+                && c9 == 'W'
+                && c10 == 'E'
+                && c11 == 'B'
+                && c12 == 'P') {
+                return ImageLoader.getWebpImage(imgb);
+            }
             if (c1 == 0x97 && c2 == 'J' && c3 == 'B' && c4 == '2' &&
                     c5 == '\r' && c6 == '\n' && c7 == 0x1a && c8 == '\n') {
                 throw new IOException(url.toString()
@@ -612,6 +626,21 @@ public static Image getInstance(byte[] imgb) throws BadElementException,
                     || (c1 == 'I' && c2 == 'I' && c3 == 42 && c4 == 0)) {
                 return ImageLoader.getTiffImage(imgb);
             }
+            if (c1 == 'R' && c2 == 'I'
+                && c3 == 'F'
+                && c4 == 'F') {
+                is = new java.io.ByteArrayInputStream(imgb);
+                long skipped = is.skip(8);
+                if(skipped == 8) {
+                    final int c9 = is.read();
+                    final int c10 = is.read();
+                    final int c11 = is.read();
+                    final int c12 = is.read();
+                    if (c9 == 'W' && c10 == 'E' && c11 == 'B' && c12 == 'P') {
+                        return ImageLoader.getWebpImage(imgb);
+                    }
+                }
+			}
             if (c1 == 0x97 && c2 == 'J' && c3 == 'B' && c4 == '2') {
                 is = new java.io.ByteArrayInputStream(imgb);
                 is.skip(4);
diff --git a/openpdf/src/main/java/com/lowagie/text/ImageLoader.java b/openpdf/src/main/java/com/lowagie/text/ImageLoader.java
index fd959c275..8c36bd8fd 100644
--- a/openpdf/src/main/java/com/lowagie/text/ImageLoader.java
+++ b/openpdf/src/main/java/com/lowagie/text/ImageLoader.java
@@ -176,6 +176,23 @@ public static Image getTiffImage(byte[] imageData) {
         }
     }
 
+    /**
+     * Creates an Image from an array of webp image bytes.
+     * https://datatracker.ietf.org/doc/rfc9649/
+     *
+     * @param imageData bytes of the webp image
+     * @return an objet of type <code>Image</code>
+     */
+    public static Image getWebpImage(byte[] imageData) {
+        try (InputStream is = new ByteArrayInputStream(imageData)) {
+            BufferedImage bufferedImage = ImageIO.read(is);
+            return Image.getInstance(bufferedImage, null, false);
+
+        } catch (Exception e) {
+            throw new ExceptionConverter(e);
+        }
+    }
+
     /**
      * Creates an Image from a JPEG image file in a byte array.
      *