Only do mapping based rewrite for archive reading, prepare for cleanup mmaped decode usage

app/src/main/java/com/hippo/UriArchiveAccessor.kt

@@ -44,6 +44,7 @@ class UriArchiveAccessor(ctx: Context, uri: Uri) {
         val buffer = extractToByteBuffer(index)
         buffer ?: return null
         check(buffer.isDirect)
+        Image.rewriteGifSource(buffer)
         return object : Image.ByteBufferSource {
             override fun getByteBuffer(): ByteBuffer {
                 return buffer

app/src/main/java/com/hippo/image/Image.kt

@@ -93,8 +93,6 @@ class Image private constructor(source: Source, private var src: ByteBufferSourc
         @JvmStatic
         fun decode(src: ByteBufferSource): Image? {
             val directBuffer = src.getByteBuffer()
-            check(directBuffer.isDirect)
-            rewriteGifSource(directBuffer)
             return runCatching {
                 Image(ImageDecoder.createSource(directBuffer), src)
             }.onFailure {
@@ -104,7 +102,7 @@ class Image private constructor(source: Source, private var src: ByteBufferSourc
         }
 
         @JvmStatic
-        private external fun rewriteGifSource(buffer: ByteBuffer)
+        external fun rewriteGifSource(buffer: ByteBuffer)
     }
 
     interface ByteBufferSource : AutoCloseable {