diff --git a/jni/NativeFormats/JavaNativeFormatPlugin.cpp b/jni/NativeFormats/JavaNativeFormatPlugin.cpp
index d452fa917..5c7e3e411 100644
--- a/jni/NativeFormats/JavaNativeFormatPlugin.cpp
+++ b/jni/NativeFormats/JavaNativeFormatPlugin.cpp
@@ -99,8 +99,8 @@ JNIEXPORT jboolean JNICALL Java_org_geometerplus_fbreader_formats_NativeFormatPl
 }
 
 extern "C"
-JNIEXPORT jboolean JNICALL Java_org_geometerplus_fbreader_formats_NativeFormatPlugin_readLanguageAndEncoding(JNIEnv* env, jobject thiz, jobject javaBook) {
-	return JNI_FALSE;
+JNIEXPORT void JNICALL Java_org_geometerplus_fbreader_formats_NativeFormatPlugin_detectLanguageAndEncoding(JNIEnv* env, jobject thiz, jobject javaBook) {
+	// TODO: implement
 }
 
 static bool initBookModel(JNIEnv *env, jobject javaModel, BookModel &model) {
diff --git a/src/org/geometerplus/fbreader/formats/FormatPlugin.java b/src/org/geometerplus/fbreader/formats/FormatPlugin.java
index 33b431912..530d430eb 100644
--- a/src/org/geometerplus/fbreader/formats/FormatPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/FormatPlugin.java
@@ -39,7 +39,7 @@ public abstract class FormatPlugin {
 
 	public abstract void readMetaInfo(Book book) throws BookReadingException;
 	public abstract void readModel(BookModel model) throws BookReadingException;
-	public abstract boolean readLanguageAndEncoding(Book book);
+	public abstract void detectLanguageAndEncoding(Book book) throws BookReadingException;
 	public abstract ZLImage readCover(ZLFile file);
 	public abstract String readAnnotation(ZLFile file);
 
diff --git a/src/org/geometerplus/fbreader/formats/JavaFormatPlugin.java b/src/org/geometerplus/fbreader/formats/JavaFormatPlugin.java
index f7f2d4278..cee285b84 100644
--- a/src/org/geometerplus/fbreader/formats/JavaFormatPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/JavaFormatPlugin.java
@@ -26,11 +26,6 @@ public abstract class JavaFormatPlugin extends FormatPlugin {
 		super(fileType);
 	}
 
-	@Override
-	public boolean readLanguageAndEncoding(Book book) {
-		return true;
-	}
-
 	@Override
 	public Type type() {
 		return Type.JAVA;
diff --git a/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java b/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java
index 326fb35c5..1aaafa068 100644
--- a/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java
@@ -47,7 +47,7 @@ public class NativeFormatPlugin extends FormatPlugin {
 	private native boolean readMetaInfoNative(Book book);
 
 	@Override
-	public native boolean readLanguageAndEncoding(Book book);
+	public native void detectLanguageAndEncoding(Book book);
 
 	@Override
 	public void readModel(BookModel model) throws BookReadingException {
diff --git a/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java b/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java
index c4076a559..440e8f3bc 100644
--- a/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java
+++ b/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java
@@ -56,4 +56,9 @@ public class FB2Plugin extends JavaFormatPlugin {
 	public EncodingCollection supportedEncodings() {
 		return new AutoEncodingCollection();
 	}
+
+	@Override
+	public void detectLanguageAndEncoding(Book book) {
+		book.setEncoding("auto");
+	}
 }
diff --git a/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java b/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java
index 3fb62ff58..aad6e4c58 100644
--- a/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java
@@ -88,4 +88,9 @@ public class OEBPlugin extends JavaFormatPlugin {
 	public EncodingCollection supportedEncodings() {
 		return new AutoEncodingCollection();
 	}
+
+	@Override
+	public void detectLanguageAndEncoding(Book book) {
+		book.setEncoding("auto");
+	}
 }
diff --git a/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java b/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java
index b92458f21..bb63708bb 100644
--- a/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java
@@ -248,4 +248,37 @@ public class MobipocketPlugin extends JavaFormatPlugin {
 	public EncodingCollection supportedEncodings() {
 		return JavaEncodingCollection.Instance();
 	}
+
+	@Override
+	public void detectLanguageAndEncoding(Book book) throws BookReadingException {
+		InputStream stream = null;
+		try {
+			stream = book.File.getInputStream();
+			final PdbHeader header = new PdbHeader(stream);
+			PdbUtil.skip(stream, header.Offsets[0] + 16 - header.length());
+			if (PdbUtil.readInt(stream) != 0x4D4F4249) /* "MOBI" */ {
+				throw new BookReadingException("unsupportedFileFormat", book.File);
+			}
+			final int length = (int)PdbUtil.readInt(stream);
+			PdbUtil.skip(stream, 4);
+			final int encodingCode = (int)PdbUtil.readInt(stream);
+			final Encoding encoding = supportedEncodings().getEncoding(encodingCode);
+			final String encodingName = encoding != null ? encoding.Name : "utf-8";
+			book.setEncoding(encodingName);
+			PdbUtil.skip(stream, 52);
+			final int fullNameOffset = (int)PdbUtil.readInt(stream);
+			final int fullNameLength = (int)PdbUtil.readInt(stream);
+			final int languageCode = (int)PdbUtil.readInt(stream);
+			book.setLanguage(ZLLanguageUtil.languageByIntCode(languageCode & 0xFF, (languageCode >> 8) & 0xFF));
+		} catch (IOException e) {
+			throw new BookReadingException(e, book.File);
+		} finally {
+			if (stream != null) {
+				try {
+					stream.close();
+				} catch (IOException e) {
+				}
+			}
+		}
+	}
 }