Initial import

Signed-off-by: Robert Grosse <grosse@google.com>

.gitignore

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+*.pyc
+*.pyo
+out.jar

CONTRIBUTING.txt

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LICENSE.txt

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README.md

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+### Introduction
+
+Enjarify is a tool for translating Dalvik bytecode to equivalent Java bytecode. This allows Java analysis tools to analyze Android applications.
+
+
+### Usage and installation
+
+Enjarify is a pure python 3 application, so you can just git clone and run it. To run it directly, assuming you are in the top directory of the repository, you can just do
+
+    python3 -O -m enjarify.main yourapp.apk
+
+For normal use, you'll probably want to use the wrapper scripts and set it up on your path.
+
+#### Linux
+
+For convenience, a wrapper shell script is provided, enjarify.sh. This will try to use Pypy if available, since it is faster than CPython. If you want to be able to call Enjarify from anywhere, you can create a symlink from somewhere on your PATH, such as ~/bin. To do this, assuming you are inside the top level of the repository,
+
+    ln -s "$PWD/enjarify.sh" ~/bin/enjarify
+
+#### Windows
+
+A wrapper batch script, enjarify.bat, is provided. To be able to call it from anywhere, just add the root directory of the repository to your PATH. The batch script will always invoke python3 as interperter. If you want to use pypy, just edit the script.
+
+#### Usage
+
+Assuming you set up the script on your path correctly, you can call it from anywhere by just typing enjarify, e.g.
+
+    enjarify yourapp.apk
+
+The most basic form of usage is to just specify an apk file or dex file as input. If you specify a multidex apk, Enjarify will automatically translate all of the dex files and output the results in a single combined jar. If you specify a dex file, only that dex file will be translated. E.g. assuming you manually extracted the dex files you could do
+
+    enjarify classes2.dex
+
+The default output file is [inputname]-enjarify.jar in the current directory. To specify the filename for the output explicitly, pass the -o or --output option.
+
+    enjarify yourapp.apk -o yourapp.jar
+
+By default, Enjarify will refuse to overwrite the output file if it already exists. To overwrite the output, pass the -f or --force option.
+
+
+### Why not dex2jar?
+
+Dex2jar is an older tool that also tries to translate Dalvik to Java bytecode. It works reasonable well most of the time, but a lot of obscure features or edge cases will cause it to fail or even silently produce incorrect results. By contrast, Enjarify is designed to work in as many cases as possible, even for code where Dex2jar would fail. Among other things, Enjarify correctly handles unicode class names, constants used as multiple types, implicit casts, exception handlers jumping into normal control flow, classes that reference too many constants, very long methods, exception handlers after a catchall handler, and static initial values of the wrong type.
+
+
+### Limitations
+
+Enjarify does not currently translate optional metadata such as sourcefile attributes, line numbers, and annotations.
+
+Enjarify tries hard to successfully translate as many classes as possible, but there are some potential cases where it is simply not possible due to limitations in Android, Java, or both. Luckily, this only happens in contrived circumstances, so it shouldn't be a problem in practice.
+
+
+### Performance tips
+
+PyPy is much faster than CPython. To install PyPy, see http://pypy.org/. Make sure you get PyPy3 rather than regular PyPy. The Linux wrapper script will automatically use the command pypy3 if available. On Windows, you'll need to edit the wrapper script yourself.
+
+By default, Enjarify runs optimizations on the bytecode which make it more readable for humans (copy propagation, unused value removal, etc.). If you don't need this, you can speed things up by disabling the optimizations with the --fast option. Note that in the very rare case where a class is too big to fit in a classfile without optimization, Enjarify will automatically retry it with all optimizations enabled, so this option does not affect the number of classes that are successfully translated.
+
+
+### Disclaimer
+
+This is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google.

enjarify.bat

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+@echo off
+
+REM  Copyright 2015 Google Inc. All Rights Reserved.
+REM
+REM  Licensed under the Apache License, Version 2.0 (the "License");
+REM  you may not use this file except in compliance with the License.
+REM  You may obtain a copy of the License at
+REM
+REM      http://www.apache.org/licenses/LICENSE-2.0
+REM
+REM  Unless required by applicable law or agreed to in writing, software
+REM  distributed under the License is distributed on an "AS IS" BASIS,
+REM  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+REM  See the License for the specific language governing permissions and
+REM  limitations under the License.
+
+set PYTHONPATH=%~dp0
+python3 -O -m enjarify.main %*

enjarify.sh

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+#!/usr/bin/env bash
+
+# Copyright 2015 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# Try to find a valid python3 command, preferring pypy if available
+function guess {
+	if [ -z "$PYTHON" ]; then
+		result=$($1 -c "print(range)" 2>/dev/null)
+		if [ "$result" = "<class 'range'>" ]; then
+			PYTHON=$1
+		fi
+	fi
+}
+
+guess "pypy3"
+guess "python3"
+guess "pypy"
+guess "python"
+
+if [ -z "$PYTHON" ]; then
+	echo "Unable to find python3 on path"
+else
+	echo "Using $PYTHON as Python interperter"
+
+	# Find location of this bash script, and set its directory as the PYTHONPATH
+	PYTHONPATH=$(dirname "$(realpath "${BASH_SOURCE[0]}")")
+
+	# Now execute the actual program
+	exec $PYTHON -O -m enjarify.main "$@"
+fi

enjarify/__init__.py

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+# Copyright 2015 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.