Appendix B – Design and Implementation Notes

Appendix B – Design and Implementation Notes

Android Cache Viewer is developed in Microsoft C# using Microsoft Visual Studio 2013 Ultimate, taking advantage of Microsoft’s DreamSpark program.

The AndroidCacheViewer.cs class is a WinForm class which takes care of the user interface. Each plugin usually extends CacheAbstract.cs which is an abstract class, which in turn implements CacheInterface.cs interface. The plugin may not extend CacheAbstract.cs but it must always implement CacheInterface.cs interface. Although CacheAbstract.cs is initially designed as an abstract, it does contain all the generic implementations and common functions used across plugins in it. This allows the actual cache-format logic to be simpler and efficient. The plugin always gets the cache file location as input and returns the control object, which is displayed by the WinForms. Hence, the plugin has the liberty to decide how to display the cache in the user interface. CacheIdentity.cs identifies the plugin and calls the corresponding plugin implementation class. Identification is based on filenames and file extensions.

The Android Cache Viewer is tested against all the apps studied in detail, which are mentioned in Table 1, that share the same cache API.

Appendix C – Source Code

AndroidCacheViewer.cs

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;
namespace Android_Cache_Viewer

{

public partial class AndroidCacheViewer : Form

string selected_file = "";

{

InitializeComponent();

//openFileDlg.Filter = "YouTube|*.cache|Android Gallery3D|*.*|cache_r.0|cache_r.0|cache_bd.0|cache_bd.0";

}
private void openToolStripMenuItem_Click(object sender, EventArgs e)

{

if(openFileDlg.ShowDialog(this)==DialogResult.OK)

selected_file = openFileDlg.FileName;

timerProcess.Start();

}

}

{

timerProcess.Stop();

this.Text = "Android Cache Viewer : " + Path.GetFileName(selected_file);

CacheInterface cache = CacheIdentity.Identify(selected_file);

displayPanel.Controls.Clear();

displayPanel.Controls.Add(cache.showCache(selected_file));

}

private void supportToolStripMenuItem_Click(object sender, EventArgs e)

displayPanel.Controls.Clear();

Label lbl = new Label();

lbl.Text = "\r\nThe caches of the following apps are supported:\r\n\r\n";

lbl.Text += "YouTube (.cache), Android Gallery3D, cache_r.0, cache_bd.0";

lbl.Dock = DockStyle.Fill;

displayPanel.Controls.Add(lbl);

}
private void aboutToolStripMenuItem_Click(object sender, EventArgs e)

{

displayPanel.Controls.Clear();

lbl.Text = "\r\nAndroid Cache Viewer is an open source software is developed by Felix Jeyareuben Chandrakumar as a part of the thesis submitted to the University of South Australia - School of Information Technology & Mathematical Sciences in fulfilment of the requirements for the degree of Master of Science (Cyber Security and Forensic Computing). The thesis was supervised by Dr Kim-Kwang Raymond Choo and Ben Martini.\r\n\r\nIcon - http://www.iconarchive.com/artist/martz90.html";

lbl.Dock = DockStyle.Fill;

displayPanel.Controls.Add(lbl);

}
private void exitToolStripMenuItem_Click(object sender, EventArgs e)

{

Application.Exit();

}

}

CacheIdentity.cs

using Android_Cache_Viewer.Plugins;

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;
namespace Android_Cache_Viewer

{

class CacheIdentity

{

public static CacheInterface Identify(String filename)

{

if (filename.EndsWith(".cache"))

return new YouTubeCache();

else if (Path.GetFileNameWithoutExtension(filename).Equals("imgcache") && !filename.EndsWith(".idx"))

return new Gallery3dCache();

else if (filename.EndsWith("cache_r.0"))

return new CacheR0();

else if (filename.EndsWith("cache_bd.0"))

return new CacheBD0();

else if (filename.EndsWith(".db"))

return new SQLiteDB();

else if (filename.EndsWith("index") || Path.GetFileName(filename).StartsWith("data_")||Path.GetFileName(filename).StartsWith("f_"))

return new WebViewCache();

else

return new NotImplemented();

}

}

}

Plugins/ CacheAbstract.cs

using System;

using System.Collections.Generic;

using System.Data;

using System.Data.SQLite;

using System.Drawing;

using System.IO;

using System.IO.Compression;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;
namespace Android_Cache_Viewer.Plugins

{

class CacheAbstract : CacheInterface

{

public virtual Control showCache(string file)

{

Label lbl = new Label();

lbl.Text = "\r\nNot Implemented!";

lbl.Dock = DockStyle.Fill;

return lbl;

}
public static Image LoadImage(byte[] imageBytes)

{

Bitmap image = null;

byte[] mbytes = new byte[imageBytes.Length];

imageBytes.CopyTo(mbytes, 0);

MemoryStream inStream = new MemoryStream(mbytes);

image = new Bitmap(Image.FromStream(inStream));

inStream.Close();

//

return image;

}
public static string displayBytes(byte[] o, int offset, int length)

{

StringBuilder sb = new StringBuilder();

for(int i=offset;i

{

sb.Append("0x"+Convert.ToInt16(o[i]).ToString("X") + " ");

}

//

string s = sb.ToString().Trim();

string[] arr = s.Trim().Split(new char[] );

string prev="";

int count = 1;

StringBuilder ss = new StringBuilder();

foreach(string a in arr)

{

if(prev==a)

count++;

else

{

ss.Append(prev);

ss.Append(" ");

if (count > 1)

{

ss.Append("(");

ss.Append(count);

ss.Append(" times) ");

}

count = 1;

prev = a;

}

}

ss.Append(prev);

ss.Append(" ");

if (count > 1)

{

ss.Append("(");

ss.Append(count);

ss.Append(" times) ");

}
return ss.ToString().Trim();

}
public static Control getContentControl(byte[] bytes)

{

Control ctrl = null;

if (bytes.Length > 5)

{

if ((bytes[0] == 'G' && bytes[1] == 'I' && bytes[2] == 'F') || (bytes[0] == 0xFF && bytes[1] == 0xD8) || (bytes[0] == 0x89 && bytes[1] == 0x50 && bytes[2] == 0x4E && bytes[3] == 0x47))

{

ctrl = new PictureBox();

((PictureBox)ctrl).Image = LoadImage(bytes);

}

else if (bytes[0] == 0x1f && bytes[1] == 0x8b)

{

var bigStream = new GZipStream(new MemoryStream(bytes), CompressionMode.Decompress);

var bigStreamOut = new System.IO.MemoryStream();

bigStream.CopyTo(bigStreamOut);

return getContentControl(bigStreamOut.ToArray());

}

else if (bytes[0] == 0x53 && bytes[1] == 0x51 && bytes[2] == 0x4C && bytes[3] == 0x69 && bytes[4] == 0x74 && bytes[5] == 0x65)

{

DataTable dt = new DataTable();

string rnd_file = Path.GetTempPath() + "/" + Path.GetRandomFileName();

File.WriteAllBytes(rnd_file, bytes);

string data_src = @"" + rnd_file;

SQLiteConnection cnn = new SQLiteConnection("Data Source=" + data_src);

cnn.Open();

SQLiteCommand mycommand = new SQLiteCommand(cnn);

mycommand.CommandText = "SELECT name FROM sqlite_master WHERE type='table'";

SQLiteDataReader reader = mycommand.ExecuteReader();

dt.Load(reader);
mycommand.Dispose();

reader.Dispose();

List tables = new List();

for (int row = 0; row < dt.Rows.Count; row++)

tables.Add(dt.Rows[row][0].ToString());

//

ctrl = new TabControl();

foreach (string table in tables)

{

TabPage page = new TabPage(table);

page.Controls.Add(getTablePage(rnd_file, table, cnn));

ctrl.Controls.Add(page);

}

cnn.Dispose();

}

else

{

ctrl = new TextBox();

((TextBox)ctrl).Multiline = true;

((TextBox)ctrl).ScrollBars = ScrollBars.Both;

((TextBox)ctrl).Text = displayFriendlyBytes(bytes, 0, bytes.Length);

((TextBox)ctrl).ReadOnly = true;

}

}

else

{

ctrl = new TextBox();

((TextBox)ctrl).Multiline = true;

((TextBox)ctrl).ScrollBars = ScrollBars.Both;

((TextBox)ctrl).Text = displayFriendlyBytes(bytes, 0, bytes.Length);

((TextBox)ctrl).ReadOnly = true;

}

ctrl.Dock = DockStyle.Fill;

return ctrl;

}
private static DataGridView getTablePage(string rnd_file, string tablename, SQLiteConnection cnn)

{

DataGridView dgv = new DataGridView();

DataTable table = new DataTable();

SQLiteCommand mycommand = new SQLiteCommand(cnn);

mycommand.CommandText = "SELECT * FROM " + tablename;

SQLiteDataReader reader = mycommand.ExecuteReader();

table.Load(reader);

mycommand.Dispose();

reader.Dispose();

dgv.DataSource = table;

dgv.Dock = DockStyle.Fill;

return dgv;

}
public static string displayFriendlyBytes(byte[] o, int offset, int length)

{

StringBuilder sb = new StringBuilder();

for (int i = offset; i < offset + length; i++)

{

if (o[i] >= 32 && o[i] < 127 || (o[i] == '\r' || o[i] == '\n'))

sb.Append(Convert.ToChar(o[i]));

else

{

sb.Append(".");

}

}

return sb.ToString().Trim();

}
public static string displayHex(byte[] o, int offset, int length)

{

StringBuilder sb = new StringBuilder();

for (int i = offset; i < offset + length; i++)

{

sb.Append(Convert.ToInt16(o[i]).ToString("X").PadLeft(2,'0'));

}

return "0x"+sb.ToString().Trim();

}
public static int getInteger(byte[] o, int offset, int length)

{

int no = 0;

for (int i = offset + length - 1; i >= offset; i--)

{

no = no + (o[i] * (int)Math.Pow(256, offset + length - 1 - i));

}

return no;

}
public static long getLong(byte[] o, int offset, int length)

{

long no = 0;

for (int i = offset + length - 1; i >= offset; i--)

{

no = no + (o[i] * (long)Math.Pow(256, offset + length - 1 - i));

}

return no;

}
public static int getIntegerR(byte[] o, int offset, int length)

{

int no = 0;

for (int i = offset; i < offset + length; i++)

{

no = no + (o[i]*(int)Math.Pow(256, i - offset));

}

return no;

}
public static long getLongR(byte[] o, int offset, int length)

{

long no = 0;

for (int i = offset; i < offset + length; i++)

{

no = no + (o[i] * (long)Math.Pow(256, i - offset));

}

return no;

}
public static string displayString(byte[] o, int offset, int length)

{

StringBuilder sb = new StringBuilder();

for (int i = offset; i < offset + length; i++)

{

sb.Append(Convert.ToChar(o[i]));

}

return sb.ToString().Trim();

}
public static Bitmap ByteToImage(byte[] blob)

{

MemoryStream mStream = new MemoryStream();

byte[] pData = blob;

mStream.Write(pData, 0, Convert.ToInt32(pData.Length));

Bitmap bm = new Bitmap(mStream, false);

mStream.Dispose();

return bm;
}
public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)

{

// Unix timestamp is seconds past epoch

System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);

dtDateTime = dtDateTime.AddSeconds(unixTimeStamp).ToLocalTime();

return dtDateTime;

}
public static DateTime JavaTimeStampToDateTime(double javaTimeStamp)

{

// Java timestamp is millisecods past epoch

System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);

dtDateTime = dtDateTime.AddSeconds(Math.Round(javaTimeStamp / 1000)).ToLocalTime();

return dtDateTime;

}

}

}

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