Add binary XML format to default image formats

Reviewed By: oprisnik Differential Revision: D64332670
facebook · Oct 16, 2024 · 481302d · 481302d
1 parent 6318780
commit 481302d
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Showing 3 changed files with 32 additions and 1 deletion.
diff --git a/imagepipeline-base/src/main/java/com/facebook/imageformat/DefaultImageFormatChecker.kt b/imagepipeline-base/src/main/java/com/facebook/imageformat/DefaultImageFormatChecker.kt
@@ -28,7 +28,9 @@ class DefaultImageFormatChecker : FormatChecker {
                   GIF_HEADER_LENGTH,
                   BMP_HEADER_LENGTH,
                   ICO_HEADER_LENGTH,
-                  HEIF_HEADER_LENGTH)
+                  HEIF_HEADER_LENGTH,
+                  BINARY_XML_HEADER_LENGTH,
+              )
               .maxOrNull())
 
   /**
@@ -61,6 +63,9 @@ class DefaultImageFormatChecker : FormatChecker {
     if (isHeifHeader(headerBytes, headerSize)) {
       return DefaultImageFormats.HEIF
     }
+    if (isBinaryXmlHeader(headerBytes, headerSize)) {
+      return DefaultImageFormats.BINARY_XML
+    }
     return if (isDngHeader(headerBytes, headerSize)) {
       DefaultImageFormats.DNG
     } else {
@@ -277,5 +282,27 @@ class DefaultImageFormatChecker : FormatChecker {
         headerSize >= DNG_HEADER_LENGTH &&
             (ImageFormatCheckerUtils.startsWithPattern(imageHeaderBytes, DNG_HEADER_II) ||
                 ImageFormatCheckerUtils.startsWithPattern(imageHeaderBytes, DNG_HEADER_MM))
+
+    /**
+     * These are the first 4 bytes of a binary XML file. We can only support binary XML files and
+     * not raw XML files because Android explicitly disallows raw XML files when inflating
+     * drawables. Binary XML files are created at build time by Android's AAPT.
+     *
+     * @see
+     *   https://developer.android.com/reference/android/view/LayoutInflater#inflate(org.xmlpull.v1.XmlPullParser,%20android.view.ViewGroup)
+     */
+    private val BINARY_XML_HEADER: ByteArray =
+        byteArrayOf(
+            3.toByte(),
+            0.toByte(),
+            8.toByte(),
+            0.toByte(),
+        )
+    private const val BINARY_XML_HEADER_LENGTH: Int = 4
+
+    private fun isBinaryXmlHeader(headerBytes: ByteArray, headerSize: Int): Boolean {
+      return headerSize >= BINARY_XML_HEADER_LENGTH &&
+          ImageFormatCheckerUtils.startsWithPattern(headerBytes, BINARY_XML_HEADER)
+    }
   }
 }
diff --git a/imagepipeline-base/src/main/java/com/facebook/imageformat/DefaultImageFormats.kt b/imagepipeline-base/src/main/java/com/facebook/imageformat/DefaultImageFormats.kt
@@ -22,6 +22,7 @@ object DefaultImageFormats {
   @JvmField val WEBP_ANIMATED: ImageFormat = ImageFormat("WEBP_ANIMATED", "webp")
   @JvmField val HEIF: ImageFormat = ImageFormat("HEIF", "heif")
   @JvmField val DNG: ImageFormat = ImageFormat("DNG", "dng")
+  @JvmField val BINARY_XML: ImageFormat = ImageFormat("BINARY_XML", "xml")
 
   /**
    * Check if the given image format is a WebP image format (static or animated).
@@ -67,5 +68,6 @@ object DefaultImageFormats {
           WEBP_EXTENDED_WITH_ALPHA,
           WEBP_ANIMATED,
           HEIF,
+          BINARY_XML,
       )
 }
diff --git a/imagepipeline/src/main/java/com/facebook/imagepipeline/decoder/DefaultImageDecoder.java b/imagepipeline/src/main/java/com/facebook/imagepipeline/decoder/DefaultImageDecoder.java
@@ -76,6 +76,8 @@ public class DefaultImageDecoder implements ImageDecoder {
             return decodeGif(encodedImage, length, qualityInfo, options);
           } else if (imageFormat == DefaultImageFormats.WEBP_ANIMATED) {
             return decodeAnimatedWebp(encodedImage, length, qualityInfo, options);
+          } else if (imageFormat == DefaultImageFormats.BINARY_XML) {
+            throw new DecodeException("unsupported image format", encodedImage);
           } else if (imageFormat == ImageFormat.UNKNOWN) {
             throw new DecodeException("unknown image format", encodedImage);
           }