4 files changed, 36 insertions, 9 deletions
diff --git a/platform/java/example/Viewer.java b/platform/java/example/Viewer.java
index e5c45be4..a559c218 100644
--- a/platform/java/example/Viewer.java
+++ b/platform/java/example/Viewer.java
@@ -431,15 +431,7 @@ public class Viewer extends Frame implements WindowListener, ActionListener, Ite
 			fileDialog.setDirectory(System.getProperty("user.dir"));
 			fileDialog.setFilenameFilter(new FilenameFilter() {
 				public boolean accept(File dir, String name) {
-					if (name.endsWith(".pdf")) return true;
-					if (name.endsWith(".xps")) return true;
-					if (name.endsWith(".oxps")) return true;
-					if (name.endsWith(".cbt")) return true;
-					if (name.endsWith(".cbz")) return true;
-					if (name.endsWith(".epub")) return true;
-					if (name.endsWith(".fb2")) return true;
-					if (name.endsWith(".xhtml")) return true;
-					return false;
+					return Document.recognize(name);
 				}
 			});
 			fileDialog.setVisible(true);
diff --git a/platform/java/mupdf_native.c b/platform/java/mupdf_native.c
index c45afcd9..daac2579 100644
--- a/platform/java/mupdf_native.c
+++ b/platform/java/mupdf_native.c
@@ -4210,6 +4210,31 @@ FUN(Document_openNativeWithPath)(JNIEnv *env, jclass cls, jstring jfilename)
 }
 
 JNIEXPORT jboolean JNICALL
+FUN(Document_recognize)(JNIEnv *env, jclass self, jstring jmagic)
+{
+	fz_context *ctx = get_context(env);
+	const char *magic = NULL;
+	jboolean recognized;
+
+	if (!ctx) return JNI_FALSE;
+	if (jmagic)
+	{
+		magic = (*env)->GetStringUTFChars(env, jmagic, NULL);
+		if (!magic) return JNI_FALSE;
+	}
+
+	fz_try(ctx)
+		recognized = fz_recognize_document(ctx, magic) != NULL;
+	fz_always(ctx)
+		if (magic)
+			(*env)->ReleaseStringUTFChars(env, jmagic, magic);
+	fz_catch(ctx)
+		jni_rethrow(env, ctx);
+
+	return recognized;
+}
+
+JNIEXPORT jboolean JNICALL
 FUN(Document_needsPassword)(JNIEnv *env, jobject self)
 {
 	fz_context *ctx = get_context(env);
diff --git a/platform/java/mupdf_native.h b/platform/java/mupdf_native.h
index acfaf1d1..4a9c7dc0 100644
--- a/platform/java/mupdf_native.h
+++ b/platform/java/mupdf_native.h
@@ -619,6 +619,14 @@ JNIEXPORT jobject JNICALL Java_com_artifex_mupdf_fitz_Document_openNativeWithBuf
 
 /*
  * Class:     com_artifex_mupdf_fitz_Document
+ * Method:    recognize
+ * Signature: (Ljava/lang/String;)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_artifex_mupdf_fitz_Document_recognize
+  (JNIEnv *, jclass, jstring);
+
+/*
+ * Class:     com_artifex_mupdf_fitz_Document
  * Method:    needsPassword
  * Signature: ()Z
  */
diff --git a/platform/java/src/com/artifex/mupdf/fitz/Document.java b/platform/java/src/com/artifex/mupdf/fitz/Document.java
index 52010a02..9b512c89 100644
--- a/platform/java/src/com/artifex/mupdf/fitz/Document.java
+++ b/platform/java/src/com/artifex/mupdf/fitz/Document.java
@@ -38,6 +38,8 @@ public class Document
 		return openNativeWithBuffer(buffer, magic);
 	}
 
+	public static native boolean recognize(String magic);
+
 	public native boolean needsPassword();
 	public native boolean authenticatePassword(String password);