static int Main(string[] args)
{
CRXExtractorOptions options = new CRXExtractorOptions();
ParserResult <CRXExtractorOptions> result = Parser.Default
.ParseArguments <CRXExtractorOptions>(args)
.WithParsed(parsed => options = parsed);
Console.WriteLine(options.FilePath);
// Extract information from file
CRXFile crx;
try
{
crx = CRXFile.FromFile(options.FilePath);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return(1);
}
// Create output directory
try
{
Directory.CreateDirectory(options.OutputPath);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return(1);
}
// Save all the files
try
{
string currentPath = Path.Combine(options.OutputPath, "pubkey.key");
File.WriteAllBytes(currentPath, crx.PubKey);
currentPath = Path.Combine(options.OutputPath, "signature.sig");
File.WriteAllBytes(currentPath, crx.Signature);
currentPath = Path.Combine(options.OutputPath, "temp.zip");
File.WriteAllBytes(currentPath, crx.ZipContents);
string extractPath = Path.Combine(options.OutputPath, @"contents\");
ZipFile.ExtractToDirectory(currentPath, extractPath);
File.Delete(currentPath);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return(1);
}
return(0);
}
public static CRXFile FromFile(string filePath)
{
CRXFile CRXData = new CRXFile();
// Will throw exception if reading error
using (BinaryReader br = new BinaryReader(File.Open(filePath, FileMode.Open, FileAccess.Read)))
{
// Read MagicNumber
for (int i = 0; i < 4; i++)
{
CRXData.MagicNumber[i] = br.ReadChar();
}
// Verify MagicNumber
if (CRXData.MagicNumber[0] != 'C')
{
CRXData.IsMagicNumberValid = false;
}
if (CRXData.MagicNumber[1] != 'r')
{
CRXData.IsMagicNumberValid = false;
}
if (CRXData.MagicNumber[2] != '2')
{
CRXData.IsMagicNumberValid = false;
}
if (CRXData.MagicNumber[3] != '4')
{
CRXData.IsMagicNumberValid = false;
}
// Read version
CRXData.Version = br.ReadUInt32();
// Verify version
if (CRXData.Version == 2)
{
CRXData.IsVersionSupported = true;
}
// Read public key length
CRXData.PubKeyLength = br.ReadUInt32();
// Read signature length
CRXData.SignatureLength = br.ReadUInt32();
// Read public key
CRXData.PubKey = new byte[CRXData.PubKeyLength];
CRXData.PubKey = br.ReadBytes(Convert.ToInt32(CRXData.PubKeyLength));
// Read signature
CRXData.Signature = new byte[CRXData.PubKeyLength];
CRXData.Signature = br.ReadBytes(Convert.ToInt32(CRXData.SignatureLength));
// Read ZIP file
long bytesLeft = br.BaseStream.Length - br.BaseStream.Position;
CRXData.ZipContents = new byte[bytesLeft];
CRXData.ZipContents = br.ReadBytes(Convert.ToInt32(bytesLeft));
}
return(CRXData);
}
