From 6e682be61e8d6b70d2937cf72c67553fc41be820 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Sat, 20 Jul 2013 19:58:04 -0700
Subject: [PATCH] Initial version of Backport to go with my article.

---
 .gitignore                        |  6 +++
 AndroidManifest.xml               | 13 ++++++
 build.xml                         | 92 +++++++++++++++++++++++++++++++++++++++
 custom_rules.xml                  |  4 ++
 project.properties                | 14 ++++++
 src/com/saurik/backport/Hook.java | 85 ++++++++++++++++++++++++++++++++++++
 6 files changed, 214 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 AndroidManifest.xml
 create mode 100644 build.xml
 create mode 100644 custom_rules.xml
 create mode 100644 project.properties
 create mode 100644 src/com/saurik/backport/Hook.java

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5959f86
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+ant.properties
+bin
+gen
+local.properties
+release.keystore
+substrate-api.jar
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
new file mode 100644
index 0000000..2c06657
--- /dev/null
+++ b/AndroidManifest.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.saurik.backport"
+    android:versionCode="1"
+    android:versionName="1.0"
+>
+    <application android:label="Backport" >
+        <meta-data android:name="com.saurik.substrate.main" android:value=".Hook"/>
+    </application>
+
+    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="17"/>
+    <uses-permission android:name="cydia.permission.SUBSTRATE"/>
+</manifest> 
diff --git a/build.xml b/build.xml
new file mode 100644
index 0000000..8913a0c
--- /dev/null
+++ b/build.xml
@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="Backport" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+         get it from the ANDROID_HOME env var.
+         This must be done before we load project.properties since
+         the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_HOME}">
+        <isset property="env.ANDROID_HOME" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+        Import per project custom build rules if present at the root of the project.
+        This is the place to put custom intermediary targets such as:
+            -pre-build
+            -pre-compile
+            -post-compile (This is typically used for code obfuscation.
+                           Compiled code location: ${out.classes.absolute.dir}
+                           If this is not done in place, override ${out.dex.input.absolute.dir})
+            -post-package
+            -post-build
+            -pre-clean
+    -->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>
diff --git a/custom_rules.xml b/custom_rules.xml
new file mode 100644
index 0000000..e20066b
--- /dev/null
+++ b/custom_rules.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="custom_rules">
+    <property name="java.compilerargs" value="-Xlint:unchecked"/>
+</project>
diff --git a/project.properties b/project.properties
new file mode 100644
index 0000000..c6998b3
--- /dev/null
+++ b/project.properties
@@ -0,0 +1,14 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-9
diff --git a/src/com/saurik/backport/Hook.java b/src/com/saurik/backport/Hook.java
new file mode 100644
index 0000000..5c0173a
--- /dev/null
+++ b/src/com/saurik/backport/Hook.java
@@ -0,0 +1,85 @@
+/* Backport - Bring New Fixes to old Androids
+ * Copyright (C) 2013  Jay Freeman (saurik)
+*/
+
+/* GNU Lesser General Public License, Version 3 {{{ */
+/*
+ * Substrate is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Substrate is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+**/
+/* }}} */
+
+package com.saurik.backport;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+
+import java.util.LinkedHashMap;
+
+import java.util.jar.JarFile;
+
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipException;
+import java.util.zip.ZipFile;
+
+import android.util.Log;
+
+import com.saurik.substrate.MS;
+
+public class Hook {
+    public static void initialize() {
+        MS.hookClassLoad("java.util.zip.ZipFile", new MS.ClassLoadHook() {
+            public void classLoaded(Class<?> ZipFile$) {
+                Field entries = null; {
+                    if (entries == null) try {
+                        entries = ZipFile$.getDeclaredField("entries");
+                    } catch (NoSuchFieldException e) {}
+
+                    if (entries == null) try {
+                        entries = ZipFile$.getDeclaredField("mEntries");
+                    } catch (NoSuchFieldException e) {}
+                }
+
+                if (entries == null)
+                    return;
+                final Field ZipFile$entries = entries;
+                ZipFile$entries.setAccessible(true);
+
+                final Method ZipFile$readCentralDir; try {
+                    ZipFile$readCentralDir = ZipFile$.getDeclaredMethod("readCentralDir");
+                } catch (NoSuchMethodException e) {
+                    Log.e("Backport", "ZipFile$readCentralDir", e);
+                    return;
+                }
+
+                MS.hookMethod(ZipFile$, ZipFile$readCentralDir,
+                    new MS.MethodAlteration<ZipFile, Void>() {
+                        public Void invoked(ZipFile thiz, Object... args)
+                            throws Throwable
+                        {
+                            ZipFile$entries.set(thiz, new LinkedHashMap<String, ZipEntry>() {
+                                public ZipEntry put(String key, ZipEntry value) {
+                                    if (super.put(key, value) != null)
+                                        throw new WrongException(new ZipException("Duplicate entry name: " + key));
+                                    return null;
+                                }
+                            });
+
+                            return invoke(thiz, args);
+                        }
+                    }
+                );
+            }
+        });
+    }
+}
-- 
2.7.4