multidex support for apk & zip

jadx-core/src/main/java/jadx/api/JadxDecompiler.java

@@ -116,7 +116,12 @@ public final class JadxDecompiler {
 		inputFiles.clear();
 		for (File file : files) {
 			try {
-				inputFiles.add(new InputFile(file));
+				InputFile inputFile = new InputFile(file);
+				inputFiles.add(inputFile);
+				while (inputFile.nextDexIndex != -1) {
+					inputFile = new InputFile(file, inputFile.nextDexIndex);
+					inputFiles.add(inputFile);
+				}
 			} catch (IOException e) {
 				throw new JadxException("Error load file: " + file, e);
 			}

jadx-core/src/main/java/jadx/core/clsp/ConvertToClsSet.java

@@ -36,7 +36,12 @@ public class ConvertToClsSet {
 			if (f.isDirectory()) {
 				addFilesFromDirectory(f, inputFiles);
 			} else {
-				inputFiles.add(new InputFile(f));
+				InputFile inputFile = new InputFile(f);
+				inputFiles.add(inputFile);
+				while (inputFile.nextDexIndex != -1) {
+					inputFile = new InputFile(f, inputFile.nextDexIndex);
+					inputFiles.add(inputFile);
+				}
 			}
 		}
 		for (InputFile inputFile : inputFiles) {
@@ -67,7 +72,12 @@ public class ConvertToClsSet {
 			if (fileName.endsWith(".dex")
 					|| fileName.endsWith(".jar")
 					|| fileName.endsWith(".apk")) {
-				inputFiles.add(new InputFile(file));
+				InputFile inputFile = new InputFile(file);
+				inputFiles.add(inputFile);
+				while (inputFile.nextDexIndex != -1) {
+					inputFile = new InputFile(file, inputFile.nextDexIndex);
+					inputFiles.add(inputFile);
+				}
 			}
 		}
 	}

jadx-core/src/main/java/jadx/core/utils/files/InputFile.java

@@ -23,11 +23,18 @@ public class InputFile {
 
 	private final File file;
 	private final Dex dexBuf;
+	public int nextDexIndex = -1;
+	private final int dexIndex;
 
 	public InputFile(File file) throws IOException, DecodeException {
+		this(file, 0);
+	}
+
+	public InputFile(File file, int dexIndex) throws IOException, DecodeException {
 		if (!file.exists()) {
 			throw new IOException("File not found: " + file.getAbsolutePath());
 		}
+		this.dexIndex = dexIndex;
 		this.file = file;
 		this.dexBuf = loadDexBuffer();
 	}
@@ -41,7 +48,7 @@ public class InputFile {
 			return loadFromClassFile(file);
 		}
 		if (fileName.endsWith(".apk") || fileName.endsWith(".zip")) {
-			Dex dex = loadFromZip(file);
+			Dex dex = loadFromZip(this,file);
 			if (dex == null) {
 				throw new IOException("File 'classes.dex' not found in file: " + file);
 			}
@@ -49,7 +56,7 @@ public class InputFile {
 		}
 		if (fileName.endsWith(".jar")) {
 			// check if jar contains 'classes.dex'
-			Dex dex = loadFromZip(file);
+			Dex dex = loadFromZip(this,file);
 			if (dex != null) {
 				return dex;
 			}
@@ -74,13 +81,26 @@ public class InputFile {
 		}
 	}
 
-	private static Dex loadFromZip(File file) throws IOException {
+	private static Dex loadFromZip(InputFile ipf, File file) throws IOException {
 		ZipFile zf = new ZipFile(file);
-		ZipEntry dex = zf.getEntry("classes.dex");
+		String dexName = "classes.dex";
+		String futureDexName = "classes2.dex";
+		if (ipf.dexIndex != 0) {
+			dexName = "classes" + ipf.dexIndex + ".dex";
+			futureDexName = "classes" + (ipf.dexIndex + 1) + ".dex";
+		}
+		ZipEntry dex = zf.getEntry(dexName);
 		if (dex == null) {
 			zf.close();
 			return null;
 		}
+		try {
+			ZipEntry futureDex = zf.getEntry(futureDexName);
+			if (futureDex != null) {
+				ipf.nextDexIndex = ipf.dexIndex == 0 ? 2 : ipf.dexIndex + 1;
+			}
+		} catch (Exception ex) {
+		}
 		ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
 		InputStream in = null;
 		try {